JP2004304558A - Video intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video intercom system whose power consumption can be reduced by simplifying the circuit structure of an intercom slave unit with camera. <P>SOLUTION: An imaging circuit block 11 constituting the intercom slave unit with camera is provided with an optical lens 1g for imaging a visitor, a solid-state image sensing device 1a, an A/D conversion circuit 1b for converting the analog video signal S1b imaged and outputted by the solid-state image sensing device into a digital video signal S1c, an imaging signal processing circuit 1c for selecting and segmenting the pixels required for displaying from the imaged pixels, a modulation circuit 1d for transmitting the segmented pixel data S1d by a digital modulation signal f1 and a timing signal generation circuit 1f for imaging and transmission and a video display circuit block 31 constituting an intercom master unit with monitor is provided with a demodulation circuit 3a for demodulating a digital modulation signal, a display signal processing circuit 3b for arranging segmented pixel data S31a in specific pixel arrangement data S3b, a video signal processing circuit 3c compensating white balance and colors of an imaged video image and a display unit 3f for confirming a video image of the visitor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video doorphone system, and more particularly to a video doorphone system in which a circuit of a camera-equipped intercom slave unit is simplified.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a television doorphone system of this type has a configuration as shown in FIG.
[0003]
In FIG. 1, the conventional TV intercom system includes first and second intercom slave units with a camera 4 and 5 installed outdoors and an intercom master unit with a monitor 6 installed indoors. The intercom master unit 6 with a connection is connected to the first intercom slave unit 4 with a camera via the first transmission line L10 and to the second intercom slave unit 5 with a camera via the second transmission line L20. I have.
The first and second intercom slave units with camera 4 and 5 have the same configuration, and include respective units (circuits) of an imaging circuit block 41, a slave unit microphone 42, a slave unit speaker 43, and a call button 44. . As shown in FIG. 7, the imaging circuit block 41 includes an optical lens 4f, a solid-state imaging device 4a, an A / D conversion circuit 4b, a video signal processing circuit 4c, a D / A conversion circuit 4d, an FM modulation circuit 4e, and a timing Each unit (circuit) of the signal generation circuit 4g is provided.
[0004]
The intercom master unit with monitor 6 includes a video display circuit block 61, a camera control button 62, a master unit microphone 63, a master unit speaker 64, and a call button 65 (circuits). As shown in FIG. 7, the video display circuit block 61 includes the FM demodulation circuit 6a, the synchronization separation circuit 6b, the A / D conversion circuit 6c, the video synchronization circuit 6d, the timing signal generation circuit 6e, and the display unit 6f. Circuit).
[0005]
In the TV intercom system configured as described above, for example, an image of a visitor who presses the call button 44 of the first intercom slave unit 4 with a camera (hereinafter, referred to as a “customer image”) S4a is a sensor pixel of the solid-state imaging device 4a. Imaged on top. At the same time, the first and second video synchronization signals S41g and S42g are output from the timing generation circuit 4g, the first video synchronization signal S41g is output to the A / D conversion circuit 4b, and the second video synchronization signal S42g is output. Each is input to the D / A conversion circuit 4d. The analog imaging signal S4b output from the solid-state imaging device 4a is output for each pixel of the solid-state imaging device 4a, converted into a digital video signal S4c by the A / D conversion circuit 4b, and input to the video signal processing circuit 4c. The image signal is converted into a digital image signal S4d which has been subjected to signal correction processing such as white balance and color correction in the video signal processing circuit 4c. The digital video signal S4d output from the video signal processing circuit 4c is converted into a normal television signal S4e by the D / A conversion circuit 4d and is synchronized with the second video synchronization signal S42g output from the timing signal generation circuit 4g. FM modulation is performed by the FM modulation circuit 4e. The FM modulation signal f10 output from the FM modulation circuit 4e is transmitted to the monitor-equipped intercom master unit 6 via the first transmission line L10.
[0006]
On the other hand, the FM modulation signal f10 transmitted to the monitor-equipped intercom master unit 6 is demodulated by the FM demodulation circuit 6a and input to the synchronization separation circuit 6b as a demodulated signal S6a. The video synchronization signal S62b and the analog video signal S61b are separated by the synchronization separation circuit 6b. The former video synchronization signal S62b generates a clock signal S6d synchronized by the video synchronization circuit 6d and is input to the timing signal generation circuit 6e. You. As a result, the first and second timing signals S61e and S62e are output from the timing signal generation circuit 6e, the first timing signal S61e is output to the A / D conversion circuit 6c, and the second timing signal S62e is output to the display unit 6f. Supplied respectively. The latter analog video signal S61b is converted to a digital video signal S6c by the A / D conversion circuit 6c and input to the display unit 6f, whereby the visitor image is displayed on the display unit 6f.
[0007]
[Patent Document 1] Japanese Patent Application Laid-Open No. 7-46583 (paragraph numbers “0011” to “0020”, FIGS. 1 to 6)
[0008]
[Problems to be solved by the invention]
However, in the TV intercom system having such a configuration, each intercom with a camera can be displayed on the display unit of the main intercom with a monitor, even though only a visitor image from one intercom with a camera can be displayed. Since each of the slave units is equipped with a video signal processing circuit, the circuit configuration of the camera-equipped intercom slave unit is complicated, and the video signal processing circuit is expensive and therefore expensive. Even when a solid-state imaging device composed of a high-pixel CCD or the like is used, since the digital video signal is converted into a television signal and transmitted to the main unit with a monitor, the band of the imaging signal is limited, and There is a disadvantage that the characteristics of the solid-state imaging device of the pixel cannot be used effectively.
[0009]
The present invention has been made to solve such a problem, and simplifies the circuit configuration of a camera-equipped intercom slave unit, is inexpensive in terms of cost, and effectively exhibits the characteristics of a high-pixel solid-state imaging device. The purpose is to provide a TV intercom system that can be used.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a television doorphone system according to the present invention includes a plurality of intercom slave units with a camera and an intercom master unit with a monitor. An optical lens, a solid-state imaging device including a CCD or CMOS sensor, an A / D conversion circuit for converting an analog video signal imaged and output by the solid-state imaging device into a digital video signal, and displaying from the imaged pixels Signal processing circuit for selecting and cutting out pixels necessary for the image processing, a modulation circuit for transmitting the cut-out pixel data as a digital modulation signal, a timing signal generation circuit for imaging and the transmission, and an interphone with a monitor A demodulation circuit for demodulating the digital modulation signal is cut out in the video display circuit block of the base unit. It is composed of a display signal processing circuit for arranging pixel data into specific pixel array data, a video signal processing circuit for performing white balance and color correction of a captured image, an LCD for confirming a visitor's image, and the like. It has a display unit.
[0011]
In addition, the intercom master unit with a monitor in the TV door phone system of the present invention includes a camera control button for performing camera control such as pan / tilt and zoom, and a modulation circuit for modulating a camera control signal by the camera control button. The intercom slave unit equipped with a demodulator is provided with a demodulation circuit for demodulating the camera control signal and processing the camera control by the imaging signal processing circuit in accordance with the instruction of the demodulated camera control signal.
[0012]
In addition, the TV door phone system of the present invention provides a display by designating origin coordinates from imaging data of a solid-state imaging device having more pixels than the number of pixels of a display unit in an imaging signal processing circuit built in a camera intercom slave unit. It is configured to cut out a rectangular displayable area of the unit and move the origin coordinates to realize camera control.
[0013]
Further, in the television doorphone system of the present invention, in the imaging signal processing circuit built in the camera-equipped intercom slave unit, a horizontal or vertical pixel array is obtained from imaging data of a solid-state imaging device having more pixels than the number of pixels of the display unit. , A rectangular displayable area of the display unit is cut out by sampling pixels to be displayed every few pixels, and camera control is realized by changing the interval between the pixels to be sampled.
[0014]
Further, the display signal processing circuit in the television door phone system of the present invention is configured to display characters or illustration information other than the visitor image on the display unit.
[0015]
Further, the display signal processing circuit in the television door phone system of the present invention is configured to digitally record and reproduce the digitized pixel data.
[0016]
Further, the TV door phone system of the present invention is configured to transmit the pixel data digitized by the camera-equipped intercom slave device to the monitor-equipped interphone master device via a wired LAN or a wireless LAN.
[0017]
According to the television doorphone system of the present invention, since the video signal processing circuit is not mounted on the camera intercom slave, the circuit of the camera intercom slave can be simplified, and thus the camera intercom slave can be used. It can be manufactured at low cost. In addition, the power consumption of the intercom slave unit with camera is reduced by the absence of the video signal processing circuit, and the transmission distance between the intercom slave unit with camera and the master unit with monitor can be increased. Furthermore, since the pixels necessary for display on the display unit are selected and extracted from the pixels imaged by the solid-state image sensor, and transmitted as digital signals to the parent unit with monitor, the video signal processing is performed on the parent unit with monitor. In addition, the characteristics of a solid-state imaging device having a high number of pixels can be effectively used.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the TV door phone system of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a system configuration diagram of a video doorphone system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a video doorphone system according to an embodiment of the present invention.
[0019]
In FIG. 1, the TV doorphone system of the present invention includes first and second intercom slave units with a camera 1 and 2 installed outdoors and an intercom master unit 3 with a monitor installed indoors. The intercom master unit with monitor 3 is connected to the first intercom slave unit with camera 1 via the first transmission line L1 and the second intercom slave unit with camera 2 via the second transmission line L2, respectively. ing. The first and second transmission lines L1 and L2 are each configured by a two-wire cable or the like.
[0020]
The first and second intercom slave units with camera 1 and 2 have the same configuration, respectively, and include an imaging circuit block 11, a slave unit microphone 12, a slave unit speaker 13, and a call button 14. As shown in FIG. 2, the block 11 includes a solid-state imaging device 1a, an A / D conversion circuit 1b, an imaging signal processing circuit 1c, a modulation circuit (hereinafter, referred to as a "child device modulation circuit") 1d, and a demodulation circuit (hereinafter, "child device"). 1e, a timing signal generation circuit (hereinafter referred to as a "child device timing signal generation circuit") 1f, and each unit (circuit) of the optical lens 1g. Here, the solid-state imaging device 1a is connected to an optical lens 1g, an A / D conversion circuit 1b, and a slave unit timing signal generation circuit 1f, and the slave unit timing signal generation circuit 1f includes an A / D conversion circuit 1b and an imaging signal processing. The circuit 1c is connected. The imaging signal processing circuit 1c is connected to the A / D conversion circuit 1b, the slave unit modulation circuit 1d, and the slave unit demodulation circuit 1e, and the slave unit modulation circuit 1d has a first transmission line L1 (or a second transmission line). L2) constitutes one transmission line La (hereinafter simply referred to as “one transmission line La”), and the slave unit demodulation circuit 1e constitutes the first transmission line L1 (or the second transmission line L2). Are connected to each other (hereinafter, simply referred to as “the other transmission line Lb”).
[0021]
The monitor intercom master unit 3 includes a video display circuit block 31, a camera control button 32, a master microphone 33, a master speaker 34, and a talk button 35. The video display circuit block 31 is shown in FIG. As described above, the demodulation circuit (hereinafter, referred to as “parent device demodulation circuit”) 3a, the display signal processing circuit 3b, the video signal processing circuit 3c, the video synchronization circuit 3d, and the timing signal generation circuit (hereinafter, referred to as “parent device timing signal generation circuit”). ) 3e, a display unit 3f, a CPU 3g, and a modulation circuit (hereinafter, referred to as a "base unit modulation circuit") 3h. Here, the base unit demodulation circuit 3a is connected to the display signal processing circuit 3b, the video synchronization circuit 3d and one transmission line La, and the display signal processing circuit 3b includes the video signal processing circuit 3c and the CPU 3g, and the video synchronization circuit 3d. Is connected to a master unit timing signal generation circuit 3e. The master unit timing signal generation circuit 3e is connected to the video signal processing circuit 3c and the display unit 3f, and the display unit 3f is connected to the video signal processing circuit 3c. Further, the CPU 3g is connected to the base unit modulation circuit 3h and the camera control button 32, and the other transmission line Lb is connected to the base unit modulation circuit 3h.
[0022]
Next, the operation of the TV door phone system of the present invention thus configured will be described. The visitor presses the call button 14 of the first intercom slave unit 1 with a camera (or the second intercom slave unit 2 with a camera), and the call signal is transmitted to the first transmission line L1 (or the second transmission line L2). ), The resident presses the talk button 35 in the monitor-equipped intercom base unit 3 that has been transmitted to the monitor-equipped intercom base unit 3 and detects the call signal. 2 between the call function (slave device microphone 12 and handset speaker 13) of the camera-equipped intercom slave device 2) and the call function (master device microphone 33 and master device speaker 34) of the monitor-equipped interphone master device 3 , The communication path is formed via the first transmission path L1 (or the second transmission path L2). A detailed description is omitted since it is similar to the arm that description is made here about the operations of the camera control, such as operations and pan-tilt and zoom to display an image of the visitor on the display unit.
[0023]
First, an operation of displaying an image of a visitor on the display unit 3f will be described.
[0024]
First, when a visitor presses, for example, the call button 14 of the first intercom slave unit 1 with a camera, operation power is supplied from the intercom master unit 3 with a monitor to the first intercom slave unit 1 with a camera. Power is supplied to each unit (circuit) of the camera-equipped intercom slave unit 1, and the imaging circuit block 11 becomes active. As a result, an image of the visitor (hereinafter referred to as “the visitor image”) S1a is formed on the sensor pixels of the solid-state imaging device 1a including the CCD and the CMOS sensor by the optical lens 1g. At the same time, the first to third video synchronization signals S11f, S12f, and S13f are output from the slave unit timing generation circuit 1f, and the first video synchronization signal S11f is sent to the solid-state imaging device 1a. S12f is input to the A / D conversion circuit 1b, and the third video synchronization signal S13f is input to the imaging signal processing circuit 1c. The analog imaging signal S1b output from the solid-state imaging device 1a is output for each pixel of the solid-state imaging device 1a, converted into a digital imaging signal S1c by the A / D conversion circuit 1b, and input to the imaging signal processing circuit 1c. Pixels necessary for display are selected and cut out from the pixels picked up by the image pickup signal processing circuit 1c. The cut-out pixel data S1d is digitally modulated by the slave unit modulation circuit 1d in accordance with the third video synchronization signal S13f output from the slave unit timing generation circuit 1f, and is converted as a digital modulation signal f1 via one transmission line La. Transmitted to the monitor-equipped intercom master unit 3.
[0025]
On the other hand, the digital modulation signal f1 transmitted to the monitor intercom master unit 3 is demodulated into a video synchronization signal S32a and pixel data S31a in the master unit demodulation circuit 3a, and the former video synchronization signal S32a is synchronized by the video synchronization circuit 3d. The converted clock signal S3d is generated and input to the parent device timing signal generation circuit 3e. As a result, the first and second timing signals S31e and S32e are output from the parent device timing signal generation circuit 3e, the first timing signal S31e is output to the video signal processing circuit 3c, and the second timing signal S32e is output to the display unit 3f. Supplied respectively.
[0026]
The latter pixel data S31a is input to the display signal processing circuit 3b and rearranged into the pixel array data S3b of the solid-state imaging device 1a. The output signal of the solid-state imaging device 1a is restored and input to the video signal processing circuit 3c. You. Then, the image captured by the image signal processing circuit 3c is white-balanced and color-corrected and input as a digital image signal S3c to a display unit 3f composed of an LCD or the like, whereby the image of the visitor is displayed on the display unit 3f. You.
[0027]
Next, camera control operations such as pan tilt and zoom will be described.
[0028]
First, when the resident operates the camera control button 32 of the monitor-equipped intercom master unit 3, an operation signal S3g for pan / tilt or zoom is output from the camera control button 32 and input to the CPU 3g. When the operation signal S3g is recognized by the CPU 3g, a camera control signal S3h is output from the CPU 3g and input to the master unit modulation circuit 3h, where the camera control signal S3g is modulated at a frequency different from the digital modulation signal f1. The signal is transmitted as f2 from the main unit modulation circuit 3h to the camera-equipped intercom slave unit 1 via the other transmission path Lb.
[0029]
On the other hand, the modulation signal f2 received by the camera intercom slave unit 1 is demodulated by the slave unit demodulation circuit 1e, and the demodulated camera control signal S1e is input to the imaging signal processing circuit 1c. Here, in this embodiment, a case will be described in which a solid-state imaging device 1a whose number of pixels (for example, 240,000 pixels) is larger than that of the display unit 3f (for example, 90,000 pixels) is used. As a pixel unit of the solid-state imaging device 1a, as shown in FIG. 3A, an example is shown in which a row is G (green), R (red), the next row is B (blue), and G is Bayer array. Further, as a pixel unit of the display unit 3f, an example in which a certain row is arranged in a stripe arrangement with RGB as shown in FIG. 3B will be described.
[0030]
FIG. 4 shows an example of electronic pan-tilt signal processing. In FIG. 4A, assuming that the coordinates (0, 0) at the upper left in the figure are the first origin coordinates (X0, Y0), the camera control signal S1e determines the first area of the effective area from all the image data of the solid-state image sensor 1a. The origin coordinates (X0, Y0) of 1 are designated, and a rectangular displayable area a1 is cut out as shown in FIG. The cut-out rectangular displayable area a1 is added with offset information from the first origin coordinates (X0, Y0) by the imaging signal processing circuit 1c, and is output as pixel data S1d. By operating the camera control button 32, as shown in FIG. 4C, the first origin coordinates (X0, Y0) are moved, for example, in the "2 frames" pan direction and in the "2 frames" tilt direction. To move the first origin coordinates (X0, Y0) (hereinafter, the moved origin coordinates are referred to as “second origin coordinates (X1, Y1)”), and as shown in FIG. The rectangular displayable area a1 at the origin coordinates (X1, Y1) is cut out. As described above, the cut-out rectangular displayable area a1 is added with offset information from the second origin coordinates (X1, Y1) from the imaging signal processing circuit 1c, and is output as pixel data S1d.
[0031]
On the other hand, in the display signal processing circuit 3b of the monitor-equipped intercom master unit 3, the first and second origin coordinates (X0, Y0) and (X1, Y1) are set to the reference coordinates (0, 0) from the input pixel data S31a. , And input to the video signal processing circuit 3c with the pixel format data S3b in digital form conforming to the standard such as ITU656 to the video signal processing circuit 3c. Processing such as balance and color correction is performed, and input to the display unit 3f as a digital video signal S3c. Thereby, as shown in FIG. 4B or FIG. 4D, the visitor image of the area designated by the camera control button 32 of the monitor-equipped intercom master unit 3 is electronically pan-tilt-displayed on the display unit 3f.
[0032]
Next, the zoom / wide operation of the imaging signal processing circuit 1c will be described with reference to FIG. In this figure, the same reference numerals are given to parts common to FIG.
[0033]
First, in the same manner as described above, the first origin coordinates (X0, Y0) or the second origin coordinates (X1, Y1) of the effective area are designated by the camera control signal S1e in the same manner as described above. You. Then, the rectangular displayable area a1 having the first and second origin coordinates (X0, Y0) and (X1, Y1) as the reference coordinates (0, 0) is cut out every n samplings according to the specified magnification. Then, the image signal processing circuit 1c outputs the pixel data S1d to which offset information from the first and second origin coordinates (X0, Y0) and (X1, Y1) is added.
[0034]
Then, in the display signal processing circuit 3b, the pixels are rearranged from the input pixel data S31a in the same manner as described above, and are input to the video signal processing circuit 3c as digital pixel array data S3b, and the video signal processing is performed. Signal processing is performed in the circuit 3c, and the digital video signal S3c is input to the display unit 3f. Thereby, the visitor image of the area designated by the camera control button 32 is electronically zoom-displayed on the display unit 3f as shown in FIG. 5B.
[0035]
In this case, as shown in FIG. 5 (c), from the image data of the solid-state image sensor 1a, pixels to be displayed every several pixels from a horizontal or vertical pixel array are sampled, so that the rectangular displayable area of the display unit 3f is sampled. a1 is cut out and output as pixel data S1d to which offset information is added in the same manner as described above, the pixels are rearranged in the display signal processing circuit 3b, and signal processing is performed in the video signal processing circuit 3c. As shown in FIG. 5D, the unit 3f can display the visitor image in the area designated by the camera control button 32 in a wide display.
[0036]
Note that, in the above-described embodiment, a case has been described where the cut-out pixel data is arranged in specific pixel array data in the display signal processing circuit 3b. The display unit 3f may display these characters and illustration information by performing signal processing on the illustration information (for example, a picture of a home delivery pattern). The display signal processing circuit 3b sends the pixelized data to the CPU 3g. May be recorded in a memory (not shown) built in the CPU 3g, and the pixel data may be reproduced if necessary. Further, the pixel data converted into data by the camera-equipped intercom slave unit is not limited to the data transmitted by the two-wire cable, and is transmitted by packet transmission to the monitor-equipped intercom master unit via a network such as a wired LAN or a wireless LAN. The same effect as the present invention can be obtained.
[0037]
【The invention's effect】
As is apparent from the above description, according to the TV door phone system of the present invention, since the video signal processing circuit is not mounted on the camera intercom slave, the circuit of the camera intercom slave can be simplified. It is possible to manufacture an intercom slave unit with a camera at low cost. In addition, the power consumption of the intercom slave unit with camera is reduced by the absence of the video signal processing circuit, and the transmission distance between the intercom slave unit with camera and the master unit with monitor can be increased. Furthermore, since the pixels necessary for display on the display unit are selected and extracted from the pixels imaged by the solid-state image sensor, and transmitted as digital signals to the parent unit with monitor, the video signal processing is performed on the parent unit with monitor. In addition, the characteristics of a solid-state imaging device having a high number of pixels can be effectively used.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a TV door phone system according to an embodiment of the present invention.
FIG. 2 is a block diagram of a TV door phone system according to one embodiment of the present invention.
FIG. 3 is a diagram showing an example of a solid-state image sensor and pixels of a display unit in the TV door phone system of the present invention.
FIG. 4 is a diagram showing an example of pan / tilt control in the TV door phone system of the present invention.
FIG. 5 is a diagram showing an example of zoom / wide control in the TV door phone system of the present invention.
FIG. 6 is a system configuration diagram of a conventional TV door phone system.
FIG. 7 is a block diagram of a conventional TV door phone system.
[Explanation of symbols]
1, 2 intercom slave unit with camera 3 intercom master unit with monitor 11 imaging circuit block 1a solid-state imaging device 1b A / D conversion circuit 1c imaging signal processing circuit 1d modulation circuit (slave unit modulation circuit)
1e demodulation circuit (child device demodulation circuit)
1 f timing signal generating circuit 1 g optical lens 31 video display circuit block 3 a demodulation circuit (base unit demodulation circuit)
3b: display signal processing circuit 3c: video signal processing circuit 3f: display unit 3h: modulation circuit (master modulation circuit)
32 camera control button f1 digital modulation signal S1b analog video signal S1c digital video signal S1e camera control signal S1d pixel data S31a pixel data S3b pixel array data

Claims (7)

A plurality of intercom slave units with a camera (1 and 2) and an intercom master unit with a monitor (3);
An image pickup circuit block (11) of the intercom slave unit with a camera has an optical lens (1g) for picking up an image of a visitor, a solid-state image pickup device (1a) composed of a CCD or a CMOS sensor, and an image pickup by the solid-state image pickup device. A / D conversion circuit (1b) for converting the analog video signal (S1b) output and output to a digital video signal (S1c), and an image signal for selecting and cutting out pixels necessary for display from the imaged pixels A processing circuit (1c), a modulation circuit (1d) for transmitting the cut-out pixel data (S1d) as a digital modulation signal (f1), and a timing signal generation circuit (1f) for the imaging and transmission.
A video display circuit block (31) of the parent unit with monitor includes a demodulation circuit (3a) for demodulating the digital modulation signal, and converts the extracted pixel data (S31a) into specific pixel array data (S3b). A display signal processing circuit (3b) for arranging, a video signal processing circuit (3c) for performing white balance and color correction of a captured image, and a display unit including an LCD for confirming the image of the customer (3f) A television door phone system, comprising: The main unit with a monitor is provided with a camera control button (32) for performing camera control such as pan / tilt and zoom, and a modulation circuit (3h) for modulating a camera control signal (S3h) by the camera control button. ,
The intercom slave unit with a camera includes a demodulation circuit (1e) for demodulating the camera control signal and processing the camera control by the imaging signal processing circuit in accordance with the demodulated camera control signal (S1e). The television doorphone system according to claim 1, wherein: In the image pickup signal processing circuit incorporated in the camera intercom slave unit, the display unit can be rectangularly displayed by designating origin coordinates from image data of the solid-state image sensor having more pixels than the display unit. The television doorphone system according to claim 2, wherein the camera control is realized by cutting out an area and moving the origin coordinates. In the imaging signal processing circuit built in the camera intercom slave, from the imaging data of the solid-state imaging device having more pixels than the number of pixels of the display unit, display is performed every few pixels from a horizontal or vertical pixel array. 3. The television doorphone system according to claim 2, wherein a rectangular displayable area of the display unit is cut out by sampling pixels to be sampled, and the camera control is realized by changing an interval between pixels to be sampled. 2. The video door phone system according to claim 1, wherein the display signal processing circuit displays characters or illustration information other than a visitor image on the display unit. 2. The video doorphone system according to claim 1, wherein the display signal processing circuit digitally records and reproduces the digitized pixel data. 2. The TV door phone system according to claim 1, wherein the pixel data converted by the camera-equipped intercom slave unit is packet-transmitted to the monitor-equipped interphone master unit via a wired LAN or a wireless LAN.

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