CN1481164A - Audio communication device with color image device and host and sub-units used in the device - Google Patents

Abstract

The present invention provides a video and audio communication system and device for colorizing images with a simple circuit without narrowing the bandwidth of audio and video signals, as well as a host computer and a slave computer for the device. It uses a visible light source that can be installed in the main body of the sub-unit to illuminate the subject to suppress the size of the sub-unit. It is characterized in that it includes a transmission line, which is arranged on the side of the sub-machine and the host machine, and uses a hybrid transformer to transmit the voice signal of the sub-machine side of the baseband from the side of the sub-machine to the side of the host machine with the transmission line, and at the same time transmit the host side of the baseband from the side of the host machine to the side of the sub-machine The sound signal transmission device of the sound signal; it is set on the side of the sub-machine, and the circuit for frequency modulating the image signal composed of the luminance signal of the baseband and the carrier chrominance signal; The image signal is added to the audio signal of the slave side of the baseband and transmitted by the adder through the transmission line; the image signal demodulation circuit on the host side and the device for color displaying the signal from the frequency modulation and demodulation device.

Description

Audio communication device with color image device and host and sub-units used in the device

The application for the present invention is the divisional application of the invention application whose application number is 97114149.5, the application date is 1997.10.24, and the original name is "color image and sound communication system".

technical field

The present invention relates to an audio communication device with a color image device for communicating image signals and audio signals.

Background technique

In the past, the known image and sound communication devices with the monitor's internal speaker position as a TV doorbell, etc., except having a voice communication function that can communicate between the host and the slave through a common transmission line, there are also slaves. The monitor display function that the sub-unit transmits the image displayed on the monitor to the main unit. Therefore, in the internal speaker with a monitor, in order to realize the display on the monitor, an imaging unit on the side of the slave is provided, a TV monitor is provided on the side of the host as an image display device, and the monitor is used on the side of the slave. The electrical signal obtained by the camera unit is converted into an image signal, and the image signal is transmitted to the host through the two-wire transmission line connecting the slave and the host, so that it becomes a display image on the TV monitor of the host.

In addition, audio signals can also be bidirectionally transmitted using the transceivers installed on the slave side and the host side, making it possible to converse with voice while watching images. In such a structure, the image signal and the audio signal are transmitted using a standard image transmission specification or a separate transmission method. Specifically, as disclosed in JP-A-2-50663, the baseband signal of the image signal and the audio signal are modulated by wave clipping, such as in NTSC mode, and then transmitted to the host after modulation, and the host demodulates the modulated signal.

In addition, in the monitoring device for monitoring external images and sounds, the baseband signal of the image signal and the sound signal are also connected to the NTSC method for carrier, modulated and then transmitted to the host, and demodulated by the host.

However, in a device using such carrier modulation, a modulation and demodulation circuit for audio signals or a modulation and demodulation circuit for image signals is necessary, and the circuits are complicated and expensive.

Corresponding to this, the use of hybrid transformers enables the transmission and reception of baseband audio signals, and at the same time, a transmission device that modulates black-and-white image signals with a carrier with a center frequency of about 4 MHz is being developed. In this device, the modulation and demodulation circuit is preferably a circuit using black-and-white image signals, since audio signals are unnecessary, and the simple structure makes it possible to reduce the price. In addition, since the frequency of the video signal can be made higher than that of the baseband, there is also a so-called feature that contributes to the reduction of the influence on the audio signal.

However, in recent years, in small monitor devices such as portable television receivers, the use of color liquid crystal displays has become the mainstream. Hard to impress.

In the above-mentioned conventional internal speaker device with a monitor, in order to keep the bandwidth of the audio signal and the video signal from being narrowed and to make it possible to reduce the price, it is possible to transmit and receive the baseband audio signal by using a hybrid transformer. At the same time, although a transmission device for FM-modulating black-and-white image signals with a carrier frequency of about 4 MHz is being developed, in recent years, devices using color liquid crystal displays have become mainstream in small monitor devices such as portable television receivers. , it is difficult to impress the user without colorization in an internal speaker installation with a monitor.

A television doorbell device is disclosed in JP-A-6143889 (Prior Art Example 1) and the like. The image of this TV doorbell device is black and white, especially under the natural light situation of low illuminance such as night or evening, as the illumination to object, can adopt the light-emitting diode (IED) that emits infrared rays. Since the CCD as an imaging unit also has sensitivity in the near-infrared region, it is possible to take an image of an illuminated subject with near-infrared rays. Therefore, since the visitor who is the subject of near-infrared lighting does not care about the lighting, it is possible to take pictures of the visitor without discomfort. Moreover, the IED has the advantage of being cheap and having a long life. Therefore, in this kind of TV doorbell device, since the illuminance of the infrared rays from the IED is generally constant, when the illuminance of the subject is changed according to the surrounding environment, it can be adjusted by using the shutter control function of the video camera to obtain proper exposure. image of .

In addition, Japanese Unexamined Patent Application Publication No. 1-243794 (Prior Art Example 2) discloses a television doorbell device in which an image is colored. In this color TV doorbell device, under the environment such as the night when it is difficult to obtain the illumination of the subject, when the subject is irradiated with infrared rays to take pictures, in order to solve the problem that the color image signal at night is different from that of the white image signal When the illuminance of the subject is low, the S/N ratio is low, and the color reproducibility deteriorates. In the environment where the illuminance of the subject becomes low, once the color image outputs a color image signal with so-called unnatural colors, it will Automatically cuts off unsightly colors of the subject and switches to a black and white image.

In addition, in an environment where the illumination of the subject is low as in the above-mentioned prior art example 2, it is not necessary to switch from color to black and white images, and Japanese Patent Application Laid-Open No. 4-269090 (Prior Art Example 3) discloses that even at night A color TV doorbell device that can also get the usual color image. The main structure of this color TV doorbell device includes a main unit arranged indoors, a sub-unit which is electrically connected to the main unit through a signal line and is arranged at the main entrance, etc., and an illuminating device arranged near the sub-unit.

In addition, a pair of parallel wires (paired wires) disclosed in, for example, JP-A-62-257287 (Prior Art Example 4) is used for the signal wires connecting the master and the slaves as described above. Therefore, there is only a structure for transmitting a color image signal and an audio signal composed of a chrominance signal and a luminance signal to such a pair of parallel lines.

In addition, in JP-A-61-167292 (Prior Art Example 5), it is disclosed that the distinction between color and black-and-white images is not clear, and when the illumination of the subject at night is low, an ignition lighting part is provided on the sub-unit for lighting. The structure of the TV doorbell device.

But as prior art example 2, with the TV doorbell device of a CCD that illuminates and uses color, under the situation that this image is colored, when the object illumination intensity such as night is low, if utilize to illuminate by light-emitting diode If the subject is illuminated by near-infrared light, the image will turn into completely unnatural colors. Moreover, if an external light source such as natural light is mixed in to illuminate the subject in addition to near-infrared light, the image captured by the above-mentioned color monitor has the problem of becoming unnatural and difficult to see.

In addition, as in prior art example 3, in the color TV doorbell device that is equipped with a lighting device near the sub-machine, and can obtain color images even at night, the lighting device and the sub-machine are separated, and there is a need for construction of the main entrance and the like. Construction is required for both, and constructional issues such as power supply wiring for lighting devices are required.

Therefore, the object of the present invention is to provide a video-audio communication system, a video-audio communication device, a video-audio communication system for video-audio communication, and a colorized video-audio communication system that performs image display with a simple circuit that does not narrow the bandwidth of audio signals and video signals. A sub-unit of a communication device and a host computer for an image-sound communication device.

Furthermore, the object of the present invention is to provide a color television capable of obtaining vivid color images even at night, by disposing a small light source that emits visible light in the main body of the sub-unit for illuminating the subject, and suppressing the sub-unit from increasing in size. Doorbell handset and color TV doorbell device.

Contents of the invention

The feature of the first aspect of the present invention is to include: a transmission line; a sound signal transmission device, which is arranged on the side of the sub-machine and the main machine, and uses a hybrid transformer to transmit the base-band sound signal of the sub-machine from the side of the sub-machine to the main machine side using the transmission line. Simultaneously, use described transmission line to also transmit the host side sound signal of baseband from host side to slave side; Carry out frequency modulation; Adder, it is located at described sub-machine side, adds the image signal frequency-modulated by described frequency modulation circuit in the sub-machine side sound signal of described baseband, and transmits with described transmission line; Frequency modulation A demodulation circuit, which is provided on the host side, demodulates the frequency-modulated image signal transmitted from the transmission line; and a color image display device, which is provided on the host side, and displays the image signal from the frequency modulation in color. The image signal of the modulation and demodulation device.

The second aspect of the present invention is characterized in that it includes: an audio signal transmission device, which is provided on the sub-unit and the main unit side, and uses the hybrid transformer to transmit the sub-unit side audio signal of the baseband from the sub-unit side to the main unit side using the transmission line. , using the transmission line to also transmit the host side sound signal of the baseband from the host side to the slave side; the frequency modulation circuit, which is located at the slave side, performs frequency modulation on the image signal formed by the brightness signal of the baseband and the carrier chrominance signal modulation; an adder, which is located on the side of the sub-machine, adds the image signal frequency-modulated by the frequency modulation circuit to the sound signal of the sub-machine side of the baseband, and transmits it with the transmission line; frequency modulation and demodulation A circuit, which is provided on the host side, demodulates the frequency-modulated image signal transmitted from the transmission line; and a color image display device, which is provided on the host computer and displays in color the signal from the frequency modulation and demodulation device. image signal.

The third aspect of the present invention is characterized in that it includes: a sound signal transmission device, which uses a transmission line to transmit a baseband slave side sound signal to the host side; an image signal; and an adder which adds the image signal frequency-modulated by the frequency modulating circuit to the slave-side audio signal of the baseband.

A fourth aspect of the present invention is characterized in that it includes: an audio signal transmission device that transmits a baseband sub-unit side audio signal to the sub-unit side using a transmission line; a frequency modulation and demodulation device that demodulates the frequency-modulated signal transmitted from the transmission line An image signal and color image display means displays the image signal from the frequency modulation and demodulation means in color.

A fifth aspect of the present invention is characterized in that, in the color video and audio communication system according to the first aspect of the present invention, an internal circuit of at least one of the master or slave is inserted between the transmission line and the transmission line. There is a transmission line transformer as an analog transmission line.

The 6th scheme of the present invention is characterized in that comprises: sub-machine main body; Solid-state imaging unit, it is equipped with in the sub-machine main body, the output carries out the image signal of photoelectric conversion; The image signal output by the unit outputs the video signal without signal processing; the sound signal processing device, which is arranged in the main body of the sub-machine, outputs the sound as the sound signal; and the small light source, which is arranged in the main body of the sub-machine, Illuminates the subject with white light.

The 7th scheme of the present invention is characterized in that it comprises: a solid-state imaging unit, which is arranged in the main body of the sub-machine, and outputs an image signal for photoelectric conversion; a manual exposure control device, while having an automatic gain control device circuit, In the case of a manual exposure operation that increases sensitivity, the automatic gain adjustment circuit is set to increase the gain, and in the case of a manual exposure operation that reduces sensitivity, the automatic gain adjustment circuit is set to decrease the gain; FIG. An image signal processing device, which outputs a video signal without signal processing to a color image signal output from a solid-state imaging unit; an audio signal processing device, which is arranged in the main body of the sub-machine, and outputs a sound as an audio signal; and a small A light source, which is arranged in the main body of the sub-machine, illuminates the subject with white light.

An eighth aspect of the present invention is characterized in that a light diffusing device is arranged in front of the irradiation direction of the small light source.

A ninth aspect of the present invention is characterized in that the small light source is a white IED.

The 1st scheme of the present invention is characterized in that comprising: as described in the 6th scheme, is used for the slave machine of color image sound communication device; For the main frame of color image sound communication device, it has display slave image signal processing A color monitor for the video signal output by the device and a speaker for outputting the sound signal output from the sound signal processing device; and a transmission line electrically connecting the main unit and the sub-machine for the color image sound communication device.

Figure overview

Fig. 1 is a block diagram showing an audiovisual communication system according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a color TV doorbell device according to an embodiment of the present invention.

Fig. 3 is a block diagram showing a color TV doorbell device according to an embodiment of the present invention.

Figure 4 shows the spectral characteristic curve of the CdS sensor.

Fig. 5 is a characteristic diagram showing the relationship between the impedance value and the illuminance of the CdS sensor.

Fig. 6 is a front view showing a monitoring camera device used in the video and audio communication system of Fig. 1 .

Fig. 7 is a graph showing the spectral distribution of a white IED.

Fig. 8 is a diagram showing the spectral distribution of an incandescent lamp (an incandescent lamp manufactured by Toshiba Lighting Co., Ltd.).

Fig. 9 is a diagram showing the spectral distribution of a fluorescent lamp (Melou 5N manufactured by Toshiba Lighting Co., Ltd.).

specific embodiment

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a block diagram showing an audiovisual communication system according to an embodiment of the present invention.

In FIG. 1, a video and audio communication system 1 has a structure in which a sub-unit 10 and a main unit 30 are connected by two-wire transmission lines 2,3. Image and sound communication system 1 has the voice communication function of two-way voice communication between the main frame 30 and the sub-unit 10 by two-wire transmission lines 2, 3, and transmits the color image signal from the sub-unit 10 to the frequency modulation of the main unit 30, and with Monitor display function as a monitor display of color images. The slave unit 10 and the main unit 30 constitute a video and audio communication device.

First, the slave unit 10 will be described. The first communication device 11 of the handset 10 that functions as a communication function is composed of a transceiver 12 and a sound circuit 13 .

In addition, the transceiver 12 of the first communication device 11 of the handset is provided with a microphone and a speaker, and the audio signal a1 from the microphone is supplied to the audio circuit 13 .

The sound circuit 13 has a hybrid transformer, and the sound signal a1 is guided to a low-pass filter 14 (called LPF) from the middle point of the primary coil of the hybrid transformer through one end. The LPF 14 passes only the frequency band included in the frequency band near the audio frequency (for example, 20 Hz to 20 KHz in the audible frequency range), and conducts the adder 22 with the audio signal a1 from the audio circuit 13 . The audio circuit 13 supplies a host audio signal b1, which will be described later, generated from the secondary coil of the hybrid transformer to the transceiver 12, and outputs it from its speaker.

Next, the camera function of the slave unit will be described. The color imaging device 15 is composed of a color imaging unit and a processing circuit 17 . The color imaging unit 16 is composed of a lens and an electrical coupling unit (CCD) color image sensor, etc., and takes an image of an object in color, and outputs red, green and blue (RGB) three-color signals. Processing circuit 17 supplies image signal c1 composed of baseband luminance signal and carrier chrominance signal from color imaging unit 16 to frequency modulation circuit 18 (hereinafter referred to as FM modulation circuit). The FM modulation circuit 18 modulates the frequency of the image signal c1, and the FM image signal d1 centered at 1 MHz turns on the high-pass full-wave filter 19 (HPF).

The HPF 19 cuts off the frequency band around the audio frequency, and conducts the adder 22 via the FM video signal d1 from the FM modulation circuit 18 .

An output terminal of the adder 22 is connected to one terminal 20 of a pair of input and output terminals of the slave unit 10 . The other terminal blade among the input and output terminals of the slave machine 10 is connected to the reference potential point while being connected to each circuit of the slave machine. Terminals 20 and 21 are connected to one end of the transmission lines 2 and 3 respectively.

Next, the host 30 will be described.

The second communication device 31 of the main unit 30 which functions as a communication function is composed of a transceiver 32 and a sound circuit 33 .

Also, the transceiver 32 of the second communication device 31 of the main unit 30 is equipped with a microphone and a speaker, and the audio signal e1 from the microphone is supplied to the audio circuit 32 .

The sound circuit 33 has a hybrid transformer, and the sound signal e1 passes from the middle point of the primary coil of the hybrid transformer to one end, and passes through a low-pass filter 34 (called LPF). The LPF 34 conducts the connection point 35 with the audio signal a1 from the audio circuit 33 only through the frequency band included in the frequency band near the audio frequency. Also, the audio circuit 13 supplies a sub-unit audio signal f1 described later generated from the secondary coil of the hybrid transformer to the transceiver 32, and outputs it from the speaker.

The connection point 35 is connected to one terminal 40 of a pair of input and output terminals of the host computer 30 through the primary coil 11 of the transmission line transformer 50 . The other end 41 of the pair of input and output terminals of the host 30 is connected to each circuit of the host 30 through the secondary coil 12 of the transmission line transformer 50 and is also connected to a reference potential point. The terminals 40, 41 are connected to the other ends of the transmission lines 2, 3, respectively. Through this connection, at the connection point 35, the FM video signal from the slave unit 10 and the baseband audio signal can be conducted.

The transmission line transformer 50 is constituted by, for example, a helical coil, and is provided with an analog transmission line.

Connection point 35 is connected to HPF 39 . The HPF 39 cuts off the frequency band near the audio frequency, blocks the baseband audio signal from the slave unit 10, and supplies the FM video signal from the slave unit 10 to the FM demodulation circuit 38 as the passing FM video signal g1. The FM demodulation circuit 38 demodulates the FM image signal g1, converts the image signal h1 composed of the baseband luminance signal and the carrier chrominance signal, and supplies it to the color image display device 42.

The color image display device 42 is constituted by, for example, a color liquid crystal display, and displays the image signal h1 in a color image.

Utilize this structure to constitute the sound signal transmitting device, it sets the communication device 11,31 on the side of the slave 10 and the side of the host 30, and utilizes a hybrid transformer to transmit the baseband signal from the slave 10 using the transmission lines 2,3 to the side of the host 30. At the same time, the voice signal of the slave machine side is transmitted from the host machine 30 side to the slave machine 10 side using the transmission line, and the host side voice signal of the baseband is transmitted.

Next, the operation of the embodiment of the present invention will be described.

The three-color image signal of color camera unit 16 photographing is converted into the image signal c2 that is made of baseband luminance signal and carrier chrominance signal by processing circuit 17, by FM modulation circuit 18, is modulated into FM image signal d1, Through HPF19, adder 22, transmission line 2,3, transmission line transformer 50 and HPF39, with FM demodulation circuit 38, demodulate the image signal h1 that is formed by the luminance signal of baseband and carrier chrominance signal, use color image display device 42 for color image display.

The slave side sound signal a1 input by the microphone of the transceiver 12 of the slave 10 is from one end of the middle point of the hybrid transformer primary coil of the sound circuit 13, through the LPF14, the adder 22, the transmission lines 2, 3, the transmission line transformer buckle and the LPF34 , is provided to the primary coil of the hybrid transformer of the sound circuit 33 . Thus, the slave-side voice signal f1 having the same content as the slave-side voice signal a1 is supplied to the transceiver 12 from the secondary coil of the hybrid transformer of the voice circuit 33, and the master-side voice as audible sound is output from its speaker. Sound signal b1.

The host side sound signal e1 input by the microphone of the transceiver 32 of the host 30 side is from one end of the middle point of the hybrid transformer primary coil of the sound circuit 33, through the LPF34, the connection point 35, the transmission line transformer 50, the transmission lines 2, 3 and the LPF14 , is provided to the primary coil of the hybrid transformer of the sound circuit 13. Thus, from the secondary coil of the hybrid transformer of the audio circuit 13, the slave-side voice signal b1 having the same content as the master-side voice signal e1 is supplied to the transceiver 12, and the master-side voice as an audible sound is output from its speaker. Sound signal b1.

In this operation, utilize the operation of HPF19, 39, do not increase the influence produced by the baseband sound signal in FM modulation circuit 18, FM demodulation circuit 38 on the one hand, and utilize the operation of HPF19, 39, do not increase by The influence of the FM image signal in the sound circuit 13,33.

With the analog transmission line inserted through the transmission line transformer 50, even if the transmission lines 2, 3 have the short distance as used in the constant circuit (that is, the length of the transmission lines 2, 3 is about 7.5m), the transmission line as a distributed constant circuit The operations of 2 and 3 can ensure stable frequency characteristics and can prevent image degradation due to disturbance of frequency characteristics.

If this is specifically described, the wavelength of the FM image signal transmitted by the transmission lines 2, 3 is 30m, and the transmission line transformer 50 is not established, if the length of the transmission lines 2, 3 reaches the wavelength of the FM image signal 1/4 of 7.5m or so, it will cause resonance and disorder of frequency characteristics. Therefore, by providing the transmission line transformer 50, the transmission line is actually lengthened, resonance is prevented, and disturbance of frequency characteristics is prevented.

According to the embodiment of the present invention as described above, only the image signal composed of the luminance signal of the baseband and the chrominance signal of the young wave is transmitted with frequency modulation, because the voice signal of the slave machine side and the voice signal of the host machine side are transmitted with the baseband Therefore, the colorization of the image display can be performed with a simple circuit structure that does not narrow the bandwidth of the audio signal and the image signal, and can contribute to impressing users without substantially increasing the manufacturing cost.

Here, the system advantages of colorizing image displays from the prior art are described. In the case of sending and receiving communication of sound signals with a system like CATV, in order to transmit sound according to FM, in the case of two-way sending and receiving communication between the host and the slave, there must be two FM demodulation circuits and two FM modulation circuits. Due to the increase of the FM demodulation circuit and the FM modulation circuit, the manufacturing cost will be higher than that of the embodiment of the present invention shown in FIG. 1 .

FIG. 2 is a perspective view showing a television doorbell device employing the video and audio communication system of FIG. 1. FIG. The TV doorbell device is composed of a sub-machine 1 set outdoors and a host machine 2 set indoors, and the two are electrically connected with a cable 3 .

The handset 1 has a color CCD 1b of a solid-state imaging unit in the handset main body 1a, a button switch 1c called a bell, a pick-up 1d for receiving the voice of the visitor, a speaker 1e for outputting the voice of the respondent, and a darker room in the surrounding environment. Small light source IED 1f emitting visible light (white) for illuminating visitors in case. 1 g of light-diffusion devices are arrange|positioned ahead of the irradiation direction of this IED1f. In addition, it is also equipped with a CdS sensor that detects visible light illumination.

In addition, the host computer 30 has a color monitor 30a for taking pictures of the visitor, a speaker for outputting the voice of the visitor, a transceiver 30b integrally installed with a pickup for receiving the voice of the visitor, and a speaker for outputting a calling sound.

During periods of low illuminance of natural light such as at night, IED 1f is illuminated to illuminate visitors. The color CCD 1b takes an image of the visitor who is being illuminated with visible light from the IED 1f. Furthermore, by using the speaker 1e and the pickup 1d of the slave 1 and the pickup 30b of the main unit 30, it is possible to communicate with the visitor without hindrance. In addition, if the visitor presses the button switch 1c, a sound will be emitted from the speaker of the main unit 30. calling tone.

Here, a white IED manufactured by Nichia Chemical Co., Ltd. used in this example will be briefly described. The basic structure of this white IED is the same as the usual blue IED of InGaN, but a thin phosphor is coated on the tube surface of the light source. Then, the blue light emitted from the tube enters the phosphor, absorbs and scatters repeatedly in the phosphor, and then radiates outward. At this time, the blue light absorbed in the phosphor acts as an excitation source, and yellow fluorescence is emitted. And, this yellow light mixes with blue light to become visible white light. In addition, the characteristics of this white IED are that the luminosity is 3cd, the efficiency is 5.01m/W, and the color temperature is 8000K when the current is 20mA and the ambient temperature is 25°C.

Figure 7 is a graph of the spectral distribution of a white IED. According to this, it emits light in the visible light wavelength region of about 380nm to 800nm, and especially has a spectral characteristic of a gentle luminous peak near 450um showing blue light and 550nm showing yellow light.

Fig. 8 is a diagram showing the spectral distribution of an incandescent lamp (an incandescent lamp manufactured by Toshiba Lighting Co., Ltd.). According to this, light is emitted in the visible light wavelength region and the infrared wavelength region of about 400 nm to 2000 nm, and most of the energy is energy emitted at the infrared wavelength.

Fig. 9 is a diagram showing the spectral distribution of a fluorescent lamp (Melou 5N manufactured by Toshiba Lighting Co., Ltd.). According to this, it emits light in the visible light wavelength region of about 400nm to 720nm, and especially has spectral characteristics that have emission peaks at red light, green light, and blue light.

As described above, it is difficult to sufficiently illuminate a subject with an incandescent lamp having low energy in the visible wavelength region mostly in the infrared wavelength region, and it is also impossible to obtain light with a sufficient color tone. Furthermore, in a fluorescent lamp having a spectral characteristic of a plurality of emission peaks, the hue of a color image tends to be around one of the emission peaks. In this case, it is necessary to adjust the fluorescent lamp or the image signal processing circuit, etc. In addition, fluorescent lamps are often large and expensive with a special ignition circuit necessary

Therefore, in order to obtain vivid color images, a continuous spectrum like natural light is the best, and emits light in the visible light wavelength region of about 380nm to 800nm. In addition, white IEDs with spectral characteristics of gentle light emission peaks are easy to adapt to this situation. light source.

According to this embodiment, in the low-illuminance situation at night, since the visible light from the IED 1f is used to illuminate and photograph the visitor, the appearance of the visitor can be checked with an easily visible picture. Furthermore, since an inexpensive and long-life light source such as IED1fp can be used, maintenance of the device is easy, and flow costs can be suppressed and reduced.

Fig. 3 is a block diagram showing a color TV doorbell device according to an embodiment of the present invention. In the figure, symbol B is the imaging part that obtains the color image signal B1, and it is to the interview of the subject; the operator A takes an image, has a lens B2 for condensing the reflected light of the interviewer A, and a lens B2 for the operator. Concentrated incident light is photoelectrically converted into color image signal BI CCD 1b

In addition, symbol C is an image signal processing device, which performs various processes on the color image signal obtained by CCD 1b while driving CCD 1b, and outputs video signal C1 composed of white brightness signal and chrominance signal. Symbol D is a CdS sensor that detects visible light. Symbol E is a half-broken part, and it is determined whether the ambient illuminance level detected by the CdS sensor D is lower than the set value. The symbol 1f is an IED that emits visible light for illuminating the visitor A, and the IED ignition control device F controls the ignition of the IED 1f according to the ignition signal from the determination part D. In addition, in the audio signal processing device G, the received audio as the audio signal G1 is output by the pickup 1d provided in the slave main body 1a.

Fig. 4 is a graph showing spectral characteristics of a CdS sensor. According to this curve, the wavelength of the CdS sensor is sensitive to visible light in the range of 400nm to 700nm, but not sensitive to infrared rays above 700nm.

Fig. 5 is a characteristic diagram showing the relationship between the impedance value and the illuminance of the CdS sensor. The CdS sensor 3 has a characteristic that its impedance value becomes lower as the illuminance becomes higher. The serial numbers in the figure indicate the types of the CdS sensor 3 .

In addition, in this embodiment, in order to solve the problems described below, the exposure control device was improved. That is to say, when the surrounding environment transitions from low illuminance to full high illuminance to ensure the gradation reproduction of the necessary color monitor, because the prior art only performs automatic exposure and manual exposure control, even if the sensitivity enhancement operation is performed , but if there is a strong light part in the color monitor screen, then the automatic gain control circuit reduces the gain and becomes the entire dark screen setting.

In addition, conversely, when the entire screen is dark when the low-sensitivity operation is performed, the automatic gain control circuit increases the sensitivity, and there is a problem that the so-called bright light part is wasted.

However, in the manual exposure control device H shown in FIG. 2, when the manual exposure operation is performed when the sensitivity is increased, the automatic gain adjustment circuit is set to increase the gain, and the manual exposure is performed when the sensitivity is decreased. In case of operation, the structure of the automatic gain adjustment circuit is set by reducing the gain.

That is to say, in the variable control automatic exposure control circuit and manual exposure control circuit, the electronic gate speed in these control circuits is set for exposure, and at the same time, it is equipped with an automatic gain adjustment circuit, which starts to automatically expose when the CCD rises. Subsequent manual exposure operations are used to replace these exposure controls with manual exposure settings to obtain image signals; in the sense of an automatic gain adjustment circuit, it is possible to limit inappropriate operations and produce bright image signals desired by the operator. .

In addition, in order to obtain gradation reproducibility under low illuminance, under high illuminance with a low gamma value setting in the prior art, the white gradation becomes slightly lacking, and there is a problem of so-called strong light scattering.

Therefore, a CCD camera equipped with an automatic exposure function and a gamma variable function can ensure the same minimum image signal level as in the prior art under low illuminance. Black-side gradation reproducibility of gamma value. On the other hand, in the case of obtaining a sufficient amount of light than the maximum exposure state, the linearity of the high-level part of the image signal is improved by making the threshold value relatively larger than that under low illuminance. The occurrence of white waste can be prevented, and a good image signal without black waste and white waste can be obtained from low illumination to high illumination.

Fig. 6 is a front view showing a monitoring camera device used in the video and audio communication system of Fig. 1 .

In Fig. 6, in the monitoring camera main body 70 as sub-unit 1, while the imaging lens force of the color imaging device 15 in Fig. 1 is provided, the transmission line 2, 3. Various circuits for transmitting said FM image signal.

To describe in more detail, the monitor camera body 70 is connected to the monitor device 80 through the transmission lines 2,3. An imaging lens 71 is provided at the upper front position inside the surveillance camera main body 70 . A dustproof transparent plate 72 is provided on the front side of the imaging lens 71 and around the front side. A microphone 73 is provided on the lower side of the front of the surveillance camera main body 70

In the monitor device 80, a color image display device 81 is provided to display the FM image signal from the monitoring camera main body 70, and the sound signal of the baseband is separated from the FM image signal of the monitoring camera main body 70. The audio output device 82 performs audio output.

According to such a configuration, the monitoring camera device can be adapted to the video and audio communication system shown in FIG. 1 .

Furthermore, in the embodiment of the present invention shown in FIG. 1, a transmission line transformer as an analog transmission line is inserted between the transmission line and the internal circuit of the host computer, but it is also possible to set the transmission line transformer in at least one of the slave or the host computer. between one of the internal circuits and the transmission line.

According to the first to fifth aspects of the present invention as described above, since the colorization of the image display is performed with a simple circuit structure that does not narrow the bandwidth of the audio signal and the image signal, it can be achieved without greatly increasing the manufacturing cost. The bottom line helps to impress the user.

According to the fifth aspect, it is possible to prevent image degradation due to disturbance of the frequency characteristic, which contributes to impressing the user.

In the sixth aspect of the present invention, since a small-sized light source that emits visible light capable of setting a bright subject in the main body of the sub-machine is used, while suppressing the enlargement of the color TV doorbell sub-unit, it is possible to obtain a clear image even at night. color image.

In the seventh aspect of the present invention, the inventive effect of the first aspect is added, and by the exposure control by manual exposure, inappropriate operations can be restricted in the sense of the automatic gain control circuit, and bright images desired by the operator can be produced. like signal.

In the eighth and ninth aspects of the present invention, the inventive effect of the first aspect is added, since the light radiated from the light source is diffused, while the object can be uniformly illuminated, for example, the visitor as the object can be illuminated. The phenomenon of feeling dazzling is less likely to occur.

In the tenth aspect of the present invention, according to the inventive effect of the first aspect, it is possible to obtain a clear image with a color monitor even at night or the like.

Claims (5)

1. A sub-machine of a voice communication device with a color image device, characterized in that it comprises: sub-machine body; The solid-state imaging unit is arranged in the main body of the sub-machine, and outputs image signals for photoelectric conversion; The image signal processing device outputs a video signal without signal processing to the image signal output from the solid-state imaging unit; a sound signal processing device, which is disposed in the main body and outputs sound as a sound signal; and A small light source, which is arranged in the main body of the sub-machine, illuminates the subject with white light. 2. A sub-machine of a sound communication device with a color image device, characterized in that it comprises: A solid-state imaging unit, which is arranged in the main body of the sub-machine, and outputs image signals for photoelectric conversion; The manual exposure control device is equipped with an automatic gain control device circuit. In the case of a manual exposure operation that increases sensitivity, the automatic gain adjustment circuit is set to increase the gain. When performing a manual exposure operation that reduces sensitivity case, set the automatic gain adjustment circuit as described by reducing the gain; The image signal processing device outputs a video signal without signal processing to the color image signal output from the solid-state imaging unit; a sound signal processing device, which is disposed in the main body of the sub-machine, and outputs sound as a sound signal; and A small light source, which is arranged in the main body of the sub-machine, illuminates the subject with white light. 3. The sub-unit of the voice communication device with color image device as claimed in claim 1, characterized in that, a light diffusing device is arranged in front of the irradiation direction of the small light source. 4. The sub-unit of the voice communication device with color image device according to claim 1, wherein the small light source is a white IED. 5. A sound communication device with a color image device, characterized in that it comprises: The sub-machine for color image and sound communication device as claimed in claim 1; A main unit for a color image and sound communication device, which has a color monitor for displaying a video signal output from the image signal processing device and a speaker for outputting an audio signal output from the sound signal processing device; and Transmission line, which is used for electrical connection between the host computer and the slave computer of the color image and sound communication device.

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