JP2010130521A - Intercom device, living room master unit, and data processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the deterioration of the image quality of compressed data by reducing the processing load of a CPU in the living room master unit of an intercom device. <P>SOLUTION: A living room maser unit 20 of an intercom device 1 is configured to compress a digital video signal into first compressed data or second compressed data, based on a timing in which a field signal or a vertical synchronizing signal included in the output of video data 202 is outputted, and to switch the output destination of data to be outputted from a JPEG encoder 204, based on a timing in which a field signal or a vertical synchronizing signal is outputted. An intercom device is configured to automatically generate first compressed data or second compressed data based on a prescribed timing, and to automatically switch the output destination of the compressed data. Thus, it is not necessary for a CPU to generate and distribute JPEG data each time as necessary, and thereby the processing load of the CPU is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intercom apparatus including a camera-equipped entrance slave unit and a living room master unit.

Conventionally, an intercom apparatus 61 having a configuration as shown in FIG. 5 is known. This intercom device 61 includes an entrance slave device 70 with a camera and a room master device 80 that can receive a video signal transmitted from the entrance slave device 70 with a camera and project the received video signal on a monitor. Yes.
The entrance unit with camera 70 is mainly installed at the entrance of the dwelling unit and used to call a resident. The base unit 80 is installed in the dwelling unit and responds to a call from the entrance unit with camera 70. Used to do. The camera-equipped entrance slave unit 70 and the room master unit 80 are connected via a transmission line 100. In addition, the room master unit 80 is further connected to a wireless terminal 90 on which an image from the entrance slave unit with camera 70 is wirelessly transmitted from the room master unit 80 and displayed. The wireless terminal 90 can be carried by a resident and can respond to calls from the camera-equipped entrance slave device 70.

JP 2004-260390 A JP 2001-128157 A

  The intercom device with the intercom device 61 includes a camera 701 that images a visitor, and a modulation circuit 702 that modulates and transmits a video signal output from the camera 701.

The room master unit 80 of the intercom device 61 includes a demodulation circuit 801, a video decoder 802, a monitor 803, a CPU 804, a recording medium 805, and a wireless module 806.
The demodulating circuit 801 demodulates a modulated video signal received from the camera-equipped entrance slave device 70, that is, a modulated signal. The video decoder 802 AD converts the video signal demodulated by the demodulation circuit 801, that is, the demodulated signal. The monitor 803 is composed of, for example, an LCD, and displays an image of the digital video signal AD-converted by the video decoder 802. A recording medium 805 is for recording JPEG data. The wireless module 806 is for wirelessly transmitting JPEG data to the wireless terminal 90.

  The wireless terminal 90 includes a wireless module 901 that receives JPEG data wirelessly transmitted from the room master unit 80, a JPEG decoder 902 that decompresses the JPEG data received by the wireless module 901, and decodes the JPEG data into a digital video signal, and the JPEG decoder. And a monitor 903 for displaying the digital video signal decoded by 902.

In the interphone device 61 as described above, the video signal imaged and generated by the camera 701 of the camera-equipped entrance slave unit 70 is modulated by the modulation circuit 702 and transmitted to the living room master unit 80 via the transmission line 100.
The modulated signal transmitted to the room master unit 80 is demodulated into a video signal by the demodulation circuit 801 and AD-converted by the video decoder 802. The AD converted digital video signal image is input to the monitor 803 and displayed.
The AD-converted digital video signal is converted into, for example, JPEG data for recording with a VGA or QVGA screen size, or JPEG data for transmission to a wireless terminal with a QQVGA screen size, based on control by the CPU 804. Encoded appropriately. The JPEG data for recording generated based on the control of the CPU 804 is recorded on the recording medium 805. On the other hand, the JPEG data for transmission generated based on the control of the CPU 804 is transmitted to the wireless module 806 and wirelessly transmitted to the wireless terminal 90.
The JPEG data wirelessly transmitted from the wireless module 806 of the office master 80 to the wireless module 901 of the wireless terminal 90 is decompressed by the JPEG decoder 902, and the decompressed image data is input to the monitor 903 and displayed.

  In the room master unit 80 of the intercom device 61 having such a configuration, the JPEG data for recording and the JPEG data for transmission are generated each time the data needs to be generated by the processing of the CPU 804 as described above. The For this reason, the processing load applied to the CPU 804 is high. Further, in order to prevent the size of the generated JPEG data from exceeding the transmission capacity to the wireless terminal 90, the compression rate at the time of generating the JPEG data is set high in advance, and the image quality is greatly deteriorated.

  An object of the present invention is to reduce the processing load of a CPU in a room base unit of an interphone device, and to reduce image quality degradation of generated JPEG data.

  In order to solve this problem, the present inventor proposes the following intercom apparatus.

The intercom apparatus of the present application is a camera-equipped cordless handset that has a function of calling a resident and a camera that captures a visitor, and a function that responds to a call from a monitor that displays a captured image of the camera or the camera-equipped cordless handset. It is an intercom apparatus which has a living room main | base station which has at least one of these.
This living room master unit is included in data conversion means for AD-converting captured image data, which is data captured by the camera of the camera-equipped entrance slave unit, and outputting a digital video signal, and included in the output of the data conversion means Data compression means for compressing the digital video signal based on a timing at which a predetermined signal is output, and data compression means output from the data compression means at a timing at which a predetermined signal included in the output of the data conversion means is output. Output destination switching means for switching the output destination of the data to be output. The data compression means includes first compressed data having a predetermined screen size, and at least one of the first compressed data and the screen size or compression ratio. And at least one or more Nth compressed data (N is an integer of 2 or more) are generated in order at predetermined intervals. The output destination switching means outputs the first compressed data to a first output destination, and the Nth compressed data is different from the first output destination, and is at least one Nth output. It is designed to output first.
In this intercom apparatus, the digital video signal is compressed into the first compressed data or the Nth compressed data on the basis of the timing at which a predetermined signal included in the output of the data converting means is output. The output destination of data output from the data compression means is switched based on the timing at which a predetermined signal included in the output of the means is output. That is, according to this intercom apparatus, since it is automatically compressed to the first compressed data or the Nth compressed data based on a predetermined timing, the screen size suitable for the use of recording data, transmission data, etc. Compressed data can be automatically generated at the compression rate and the output destination of the compressed data is automatically switched, so that the CPU generates compressed data whenever necessary and Since it is not necessary to output data appropriately to a proper output destination, the processing load on the CPU can be reduced.

The data compressing unit may generate two or more compressed data in order at predetermined intervals based on the timing at which a predetermined signal included in the output of the data converting unit is output.
The compression may be performed, for example, every time a predetermined signal is output N times. However, every time a predetermined signal included in the output of the data conversion unit is output (N = 1), the digital signal is output. The video signal can be compressed. In this way, the image quality of the compressed data transmitted to the wireless terminal can be improved as compared with the case where compression is performed every time a predetermined signal is output several times.
This data compression means only needs to generate two or more pieces of compressed data having different screen sizes or compression ratios. Three types of compressed data having different screen sizes or compression ratios are predetermined. It may be generated in order at every interval. In this way, it is possible to cope with cases where there are two or more wireless terminals and the screen sizes and transmission rates are different. Further, “in order” may be in any order as long as it has a certain regularity.

  The data compression means generates the first compressed data or the Nth compressed data in order of M pieces, and the output destination switching means is a predetermined signal included in the output of the data conversion means. The output destination of the data may be switched every time M is output M times. For example, when the data compression means generates two compressed data, compression is performed every time a predetermined signal is output, and the first compressed data, the first compressed data, the second compressed data, the second compressed data,... Thus, two pieces of each compressed data may be generated, or the first compressed data, the first compressed data, the first compressed data, the second compressed data, the second compressed data, and the second compressed data. Three pieces of each compressed data may be generated, such as first compressed data.

  The predetermined signal included in the output of the data conversion unit may be a signal output at regular intervals, for example, a vertical synchronization signal or a field signal output by the data conversion unit.

The living room master further has a data size determining means for determining whether a data size of at least one of the first compressed data and the Nth compressed data is within a predetermined range. And when the data size determining means determines that the data size of the compressed data is not within the predetermined range, the data size determining means is configured so that the data size of the compressed data is within the predetermined range. Control may be made so that the compression rate is further varied and further compression is performed.
With this configuration, for example, when at least one of the first compressed data and the Nth compressed data is data for transmission, the data size can be arbitrarily set according to the transmission capacity. The compression rate can be varied so as to obtain an appropriate size, and the image quality can be improved. Further, even when at least one of the first compressed data and the Nth compressed data is data for recording, the compression rate can be varied similarly, so that the image quality can be improved. .
In the above data size determination means, the same processing may or may not be performed for two or more compressed data. When the same processing is performed on the compressed data, the image quality can be improved as described above.

Further, the inventor of the present application proposes the following room master unit.
This living room master unit is used in combination with a camera that captures a visitor and an entrance device with a camera of an intercom device having a function of calling a resident, and a monitor that displays a captured image of the camera or the entrance device with a camera At least one of the functions of answering a call from
This room master unit is a data conversion unit that AD-converts captured image data, which is data captured by the camera of the camera-equipped slave unit, and outputs a digital video signal. Data compression means for compressing the digital video signal based on a timing at which a predetermined signal included in the output of the data conversion means is output, and timing at which a predetermined signal included in the output of the data conversion means is output. Output destination switching means for switching the output destination of the data output from the data compression means based on the first compressed data having a predetermined screen size and the first compressed data. And at least one of the N-th compressed data (N is an integer of 2 or more) having at least one of a screen size or a compression rate different from each other. The output destination switching means outputs the first compressed data to a first output destination and the Nth compressed data to the first output destination. The output is made to at least one or more different Nth output destinations.
By using such a living room parent device, the processing load of the CPU of the living room parent device can be reduced as described above.

The above-mentioned office master unit includes a data size determining unit that determines whether or not a data size of at least one of the first compressed data and the Nth compressed data is within a predetermined range. And when the data size determination means determines that the data size of the compressed data is not within a predetermined range, the compression size is set so that the data size of the compressed data is within the predetermined range. You may make it control so that it may compress further by changing the compression rate of data.
According to such a configuration of the room master, as described above, when at least one of the first compressed data and the Nth compressed data is data for transmission, the data matched to the transmission capacity By arbitrarily setting the size, it is possible to vary the compression rate so as to obtain an appropriate size, and to improve the image quality.
Note that the data compression means and output destination switching means of the living room master can be configured as described above.

As described above, the same effect as that of the intercom apparatus can be obtained by the following method, for example.
This method is a method executed in a device used in combination with a camera that captures a visitor and a camera-equipped entrance slave unit having a function of calling a resident.
Then, a process of AD-converting captured image data, which is data captured by the camera of the entrance unit with camera, and outputting a digital video signal, and a timing at which a predetermined signal included in the digital video signal is output The digital video signal is compressed based on the first compressed data having a predetermined screen size, and at least one or more Nth compressed data (N Is an integer greater than or equal to 2 in order at predetermined intervals, and based on the timing at which the predetermined signal included in the digital video signal is output, the first compressed data is output to the first output destination. And output the Nth compressed data to at least one or more Nth output destinations different from the first output destination. Has a step of switching a power destination, the.

  In this data processing method, it is determined whether the data size of at least one of the first compressed data and the Nth compressed data is within a predetermined range, and the data of the compressed data When it is determined that the size is not within the predetermined range, the method further includes a step of performing compression again by changing the compression rate of the compressed data so that the data size of the compressed data is within the predetermined range. Also good.

  According to the present invention, it is possible to reduce the processing load of the CPU of the room base unit of the intercom device, and to reduce image quality deterioration of JPEG data.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

The intercom apparatus 1 according to this embodiment is schematically configured as shown in FIG. The intercom apparatus 1 includes an entrance slave unit 10 with a camera, a living room master unit 20 that receives a video signal transmitted from the entrance slave unit 10 with a camera, and displays the received video signal on a monitor, and an entrance with a camera. It includes a wireless terminal 30 on which an image from the child device 10 is displayed by wireless transmission from the living room parent device.
The entrance unit with camera 10 is mainly installed at the entrance of the dwelling unit and used to call a resident. The base unit 20 is installed in the dwelling unit and responds to calls from the entrance unit with camera 10. Used to do. The camera-equipped entrance slave unit 10 and the living room master unit 20 are connected via a transmission line 40. The wireless terminal 30 can be carried by a resident and can respond to calls from the camera-equipped entrance cordless handset 10, and is appropriately used at an appropriate location in the dwelling unit.

  Hereinafter, the configuration of the entrance slave device with camera 10, the parent room 20, and the wireless terminal 30 will be described. First, the configuration of the camera-equipped entrance slave unit 10 will be described.

  The entrance unit 10 with a camera includes a camera 101 that images a visitor, and a modulation circuit 102 that modulates and transmits a video signal output from the camera 101.

The room master 20 includes a demodulation circuit 201, a video decoder 202, a monitor 203, a JPEG encoder 204, a quantization table 205, a scaler 206, a data size determination unit 207, a buffer 208, a multiplexer 209, A timing generation circuit 210, a recording control unit 211, a recording medium 212, a serial communication device 213, and a wireless module 214 are provided.
The demodulating circuit 201 demodulates a modulated video signal received from the camera-equipped entrance cordless handset 10, that is, a modulated signal.
The video decoder 202 AD converts the video signal demodulated by the demodulation circuit 201, that is, the demodulated signal. The monitor 203 displays the digital video signal output by AD conversion by the video decoder 202.
The JPEG encoder 204 compresses the digital video signal and encodes it into compressed image data, that is, JPEG data.
The quantization table 205 sets the compression rate of the JPEG encoder.
The scaler 206 changes the coefficient of the quantization table.
The timing generation circuit 210 outputs a timing signal for switching the compression rate of the JPEG data generated by the JPEG encoder 204 and a timing signal for switching the output destination of the JPEG data by the multiplexer 209.
The data size determination unit 207 determines whether the data sizes of the two types of JPEG data generated by the JPEG encoder 204 are within the set size range.
The buffer 208 temporarily stores the JPEG data output from the data size determination unit 207 when the data size of the JPEG data is within the size range set by the data size determination unit 207.
The multiplexer 209 switches the output destination of the JPEG data received from the buffer 208 based on the signal from the timing generation circuit 210.
The recording control unit 211 controls recording of JPEG data for recording output from the multiplexer 209.
The recording medium 212 stores JPEG data for recording by the recording control unit 211.
The serial communication unit 213 controls transmission of JPEG data for transmission output from the multiplexer 209.
The wireless module 214 is for wirelessly transmitting JPEG data to the wireless terminal 30.

  The wireless terminal 30 includes a wireless module 301 that receives the JPEG data wirelessly transmitted from the room master unit 20, a JPEG decoder 302 that decompresses the JPEG data received by the wireless module 301 and decodes it into a digital video signal, and the JPEG And a monitor 303 for displaying the digital video signal decoded by the decoder.

  Next, the operation of the intercom device 1 configured as described above will be described. However, since the operation of the intercom apparatus 1 that calls the room base unit 20 from the camera-equipped main unit 10 and the response operation by the room base unit 20 is the same as the conventional one, the description is omitted here. The flow of the video signal output from the camera 101 based on the calling operation of the camera-equipped entrance slave 10 will be mainly described.

  The video signal S1 imaged and generated by the camera 101 of the camera-equipped entrance 10 is modulated by the modulation circuit 102 and transmitted to the living room master 20 via the transmission line 40 as the modulation signal S2.

  The modulation signal S2 transmitted to the room master 20 is input to the demodulation circuit 201, demodulated, and input to the video decoder 202 as a video signal S3. The video decoder 202 executes synchronous reproduction and AD conversion of the video signal S3 and outputs a digital video signal S4.

The digital video signal S4 is input to the monitor 203, the JPEG encoder 204, and the timing generation circuit 210.
The image of the digital video signal S4 input to the monitor 203 is displayed on the monitor 203.

On the other hand, the JPEG encoder 204 JPEG-compresses the input digital video signal S4 at a compression rate based on the settings of the scaler 206 and the quantization table 205, and outputs JPEG data d1.
Here, the timing generation circuit 210 of the present embodiment transmits a timing signal to the scaler 206 and the multiplexer 209 at a predetermined timing based on the field signal or vertical synchronization signal included in the digital video signal S4 output from the video decoder 202. The scaler 206 of this embodiment controls the JPEG encoder 204 to perform compression by the JPEG encoder 204 by switching the compression rate and the screen size for each timing signal.
Therefore, as shown in FIG. 2, the JPEG encoder 204 alternately outputs two types of JPEG data having different compression rates and screen sizes, that is, the first JPEG data (1) and the second JPEG data (2). The first JPEG data (1) and the second JPEG data are output with different headers.
The screen size of the JPEG data can be VGA or QVGA for recording data, for example, and QQVGA for transmission data, for example.

The timing generation circuit 210 according to the present embodiment is described as being configured to transmit a timing signal to the scaler 206 and the multiplexer 209 every time a field signal or a vertical synchronization signal is output, but is not limited thereto. For example, a timing signal is transmitted to the scaler 206 every time a field signal or vertical synchronization signal is output, while a timing signal is transmitted to the multiplexer 209 every time a field signal or vertical synchronization signal is output M times. You may come to do. In this case, the scaler 206 is set so as to alternately output two types of JPEG data having different compression rates and screen sizes.
For example, when the timing generation circuit 210 is configured to transmit a timing signal to the multiplexer 209 every time a field signal or a vertical synchronization signal is output twice, the scaler 206 can display the first JPEG data as shown in FIG. (1) The second JPEG data (2) may be set to be output alternately two by two.
The timing generation circuit 208 does not necessarily generate a timing signal based on a field signal or a vertical synchronization signal, and may be a signal output at a constant interval.

  The JPEG data d1 output from the JPEG encoder 204 is input to the data size determination unit 207. In this data size determination unit 207, two types of data size as a reference, that is, a recording data size for recording on the recording medium 212 and a transmission data size for transmission to the wireless terminal 30 are set in advance. Has been. Here, the first screen size data is set as a reference, and the second screen size data is set as a reference based on the second data size.

Hereinafter, the operation of the data size determination unit 207 will be described based on the flowchart of FIG.
The JPEG data d1 output from the JPEG encoder 204 is input to the data size determination unit 207 (ST51).
The data size determination unit 207 compares the data size of the JPEG data d1 with either the data size for recording or the data size for transmission based on the header of the JPEG data d1 input from the JPEG encoder 204, and When the data size is within the set recording data size or transmission data size range (ST52: Yes), this JPEG data is output to the buffer 208 (ST53).
On the other hand, if the data size of the JPEG data d1 is outside the set recording data size or transmission data size range (ST52: No), the output of 208 to the buffer is not performed and the setting of the scaler 206 is changed. And the compression of the JPEG data d1 by the JPEG encoder 204 is executed again at a different compression rate (ST54). The JPEG data d1 output from the JPEG encoder 204 is input again to the data size determination unit 207 (ST51). As described above, the data size determination unit 207 uses the header to set the data size of the JPEG data d1 for recording. Comparison is made with either the data size or the data size for transmission (ST52).
In this way, when the data size of the JPEG data d1 is out of the set recording data size or transmission data size range, the JPEG data within the set range of the JPEG data d1 data size. Variable scaling is performed until d2.

The JPEG data d2 output to the buffer 208 is input to the multiplexer 209.
The multiplexer 209 switches the output destination of the JPEG data d2 received from the buffer 208 every time a timing signal is input from the timing generation circuit 210, and the JPEG data d2 is switched to the recording control unit 211 or the serial communication unit 213. Output to either of these. As a result, the JPEG data generated by the JPEG encoder 204 is distributed to either recording JPEG data or transmission JPEG data.

The recording control unit 211 records the JPEG data d3 input from the multiplexer 209 on the recording medium 212.
The serial communication unit 213 controls to wirelessly transmit the JPEG data d4 input from the multiplexer 209 from the wireless module 214 to the wireless terminal 30.

  The JPEG data d4 wirelessly transmitted from the wireless module 214 of the living room master unit 20 to the wireless module 301 of the wireless terminal 30 is expanded by the JPEG decoder 302, and the expanded image data d5 is input to the monitor 303 and displayed.

  According to the interphone device 1 as described above, at least one of the screen size and the compression rate automatically differs by the JPEG encoder 204 based on the timing at which the field signal or vertical synchronization signal included in the output of the video decoder 202 is output. Two types of JPEG data are generated, and the output destination of JPEG data is automatically switched so that one of them is data for recording and the other is data for transmission. There is no need for the CPU to generate and allocate JPEG data, and the processing load on the CPU can be reduced as compared with the prior art.

  In addition, the data size determination unit 207 can arbitrarily set a data size suitable for each application, and can perform recompression by changing the compression rate so as to be an appropriate size, so a high compression rate is set in advance. The image quality can be improved as compared with the case.

  Since the digital video signal is compressed every time a field signal or vertical synchronization signal is output, the compressed data transmitted to the wireless terminal 30 can be displayed at a constant frame rate, and the image quality can be improved. Can be constant.

  In the present embodiment described above, the data size determination unit 207 has been described as determining both JPEG data for transmission and recording. However, it is not always necessary to determine both, for example, for recording. You may comprise so that it may not determine about JPEG data.

  The compression by the JPEG encoder 204 is not necessarily performed for each field signal or vertical synchronization signal, but may be performed based on the timing at which the field signal or vertical synchronization signal is output.

The JPEG encoder 204 only needs to generate two or more pieces of compressed data having different screen sizes or compression rates. For example, three types of compression having different screen sizes or compression rates are available. The data may be generated in order at predetermined intervals. In this way, it is possible to cope with a case where there are two or more wireless terminals or a case where the screen size and transmission rate of each device other than the wireless terminal are different. Note that “in order” may be in any order as long as it has a certain regularity.
When three types of compressed data are generated, the multiplexer is switched to output the respective compressed data to three output destinations. For example, the first compressed data can be output to the recording control unit described above, the second compressed data can be output to the first serial communication unit, and the third compressed data can be output to the second serial communication unit. The second compressed data may be transmitted to the first wireless terminal through the first wireless module, and the third compressed data may be transmitted to the second wireless terminal through the second wireless module. Further, the third compressed data may be configured to be transmitted to another device through the LAN.
In this embodiment, an example in which JPEG data is generated as compressed data has been described. However, the present invention is not limited to this, and data in another format may be used.

The figure which shows the whole structure of the intercom apparatus of this embodiment. The figure which shows the output of two types of JPEG data produced | generated by the JPEG encoder of this embodiment. The figure which shows the output of two types of JPEG data produced | generated by the JPEG encoder in a modification. The flowchart which shows operation | movement of the data size determination part of this embodiment. The figure which shows the whole structure of the conventional intercom apparatus.

Explanation of symbols

1, 61 ·· Interphone device, 10, 70 · · Door unit with camera, 20, 80 · · Master unit for living room, 30, 90 · · Wireless terminal (second output destination), 40, 100 · · Transmission line 101, 701 ... Camera 102, 702 ... Modulation circuit 201, 801 ... Demodulation circuit 202, 802 ... Video decoder (data conversion means) 203, 303, 803, 903 ... Monitor 204 804... JPEG encoder (data compression means) 205... Quantization table 206.. Scaler 207 .. Data size determination unit 208 208 Buffer 209 Multiplexer (output destination switching means) 210 Timing generation circuit 211... Recording control unit 212 805 Recording medium 213 Serial communication unit 214 301 301 806 01 ... wireless module, 302,902 ·· JPEG decoder

Claims (9)

At least one of a camera that captures a visitor and a camera-equipped entrance slave having a function of calling a resident, and a monitor that displays a captured image of the camera or a function that responds to a call from the camera entrance slave An intercom device having a living room
The living room master unit is included in a data conversion unit that AD-converts captured image data that is data captured by the camera of the camera-equipped entrance unit and outputs a digital video signal, and is included in the output of the data conversion unit Data compression means for compressing the digital video signal based on a timing at which a predetermined signal is output, and data compression means output from the data compression means at a timing at which a predetermined signal included in the output of the data conversion means is output. Output destination switching means for switching data output destinations,
The data compression means includes at least one N-th compressed data (N is an integer equal to or larger than 2), which is different from the first compressed data having a predetermined screen size and at least one of the first compressed data and the screen size or the compression rate. ) In order at predetermined intervals,
The output destination switching means outputs the first compressed data to a first output destination, and outputs the Nth compressed data to at least one or more N output destinations different from the first output destination. It looks like
Intercom device. The data compression means compresses the digital video signal every time a predetermined signal included in the output of the data conversion means is output.
The intercom apparatus according to claim 1. The data compression means generates the first compressed data or the Nth compressed data in order of M pieces,
The output destination switching means switches the output destination of the data every time a predetermined signal included in the output of the data conversion means is output M times.
The intercom apparatus according to claim 2. The predetermined signal included in the output of the data conversion means is a vertical synchronization signal or a field signal output from the data conversion means.
The intercom apparatus according to any one of claims 1 to 3. The room master further has data size determination means for determining whether or not the data size of at least one of the first compressed data and the Nth compressed data is within a predetermined range. And
When the data size determining means determines that the data size of the compressed data is not within a predetermined range, the compression rate of the compressed data is varied so that the data size of the compressed data is within the predetermined range. Control to further compress,
The intercom apparatus according to any one of claims 1 to 4. Used in combination with a camera that captures a visitor and an entrance device with a camera of an interphone device having a function of calling a resident, and responds to calls from the monitor that displays the captured image of the camera or a call from the entrance device with a camera A room master unit of an intercom device having at least one of functions,
Data conversion means for AD-converting captured image data, which is data captured by the camera of the entrance unit with camera, and outputting a digital video signal, and a predetermined signal included in the output of the data conversion means are output. A data compression unit that compresses the digital video signal based on the timing of the data, and an output destination of data output from the data compression unit based on the timing at which a predetermined signal included in the output of the data conversion unit is output. Output destination switching means for switching,
The data compression means includes at least one N-th compressed data (N is an integer equal to or larger than 2), which is different from the first compressed data having a predetermined screen size and at least one of the first compressed data and the screen size or the compression rate. ) In order at predetermined intervals,
The output destination switching means outputs the first compressed data to a first output destination, and outputs the Nth compressed data to at least one or more N output destinations different from the first output destination. It looks like
Intercom device base unit. A data size determining means for determining whether or not a data size of at least one of the first compressed data and the Nth compressed data is within a predetermined range;
When the data size determining means determines that the data size of the compressed data is not within a predetermined range, the compression rate of the compressed data is varied so that the data size of the compressed data is within the predetermined range. Control to further compress,
The room master of the intercom device according to claim 6. A method to be executed in a device used in combination with a camera with a camera of an interphone device having a function of calling a resident and a camera that images a visitor,
A process of AD-converting captured image data that is data captured by the camera of the entrance unit with the camera and outputting a digital video signal;
The digital video signal is compressed based on a timing at which a predetermined signal included in the digital video signal is output, and the first compressed data having a predetermined screen size, at least one of the first compressed data and the screen size or the compression ratio. A process of sequentially generating at least one or more N-th compressed data (N is an integer of 2 or more) different in one order at predetermined intervals;
Based on the timing at which a predetermined signal included in the digital video signal is output, the first compressed data is output to a first output destination, and the Nth compressed data is different from the first output destination, at least Switching the output destination of the compressed data to output to one or more Nth output destinations.
Data processing method. It is determined whether at least one of the first compressed data and the Nth compressed data has a data size within a predetermined range, and the data size of the compressed data is within a predetermined range. If it is determined that the data size of the compressed data is not within the predetermined range, the compression data may be compressed again by changing the compression rate so that the data size is within the predetermined range.
The data processing method according to claim 8.

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