JPH07274078A - Av system - Google Patents

Abstract

PURPOSE:To realize a low cost AV system without using an AV bus. CONSTITUTION:Respective AV equipments are connected by an AV signal line. AV section data processing circuit 15 detects a caption signal and outputs the detection result to a microcomputer 18. A control data inserting circuit 16 generates the caption signal which can be detected by the V section data processing circuit 15, inserts it at a position on a horizontal scanning line, which is different from that of the caption signal and transmits it to VTR 2. In VTR 2, the control signal is detected in the V section data processing circuit 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AV system suitable for use in the case where a plurality of AV devices are configured as an AV system in each home, for example.

[0002]

2. Description of the Related Art Recently, with the spread of AV equipment, the number thereof is increasing. Therefore, it has been proposed to configure each AV device as an AV system so that it can be managed in a centralized manner.

To configure an AV system, for example, D2
There is a method of connecting each AV device by an AV bus such as a B bus. According to this system, there is an advantage that each AV device can be surely controlled via the AV bus.

[0004]

However, in this system, in addition to connecting each AV device with an AV signal line,
Since the AV bus must be connected, there is a problem that the wiring becomes complicated.

The present invention has been made in view of such a situation, and it is possible to simplify the wiring process when the AV system is constructed.

[0006]

The AV system of the present invention is an AV system composed of a plurality of AV devices connected to each other by AV signal lines and transmitting and receiving AV control signals via the AV signal lines. The device is provided with a detection means (for example, the V-section data processing circuit of FIG. 1) for detecting character information superimposed within a predetermined horizontal scanning period of the 10th to 21st horizontal vertical blanking periods of the video signal. 15,3
3) and superimposing means for superimposing the AV control signal detectable by the detecting means in a horizontal scanning period different from the predetermined horizontal scanning period (for example, the control data insertion circuits 16 and 17 in FIG. 1).
And in the first AV device, the AV control signal is superimposed and output to the AV signal line within a predetermined horizontal scanning period.
In the second AV device, the AV control signal is detected from the video signal received via the AV signal line, and the detected AV is detected.
It is characterized in that a predetermined operation is performed in response to the control signal.

The AV control signal is used to turn on or off the power of the second AV device, start or end the program, start or end the recording, start or end the reproduction, reproduction position, time, image quality, volume, sound quality, confirmation. It can be a signal representing at least one of them.

Further, the AV control signal can include concealment information for concealing the display.

[0009]

In the AV system having the above structure, the first A
In the V device, the control data insertion circuits 16 and 17 superimpose the AV control signal within a predetermined horizontal scanning period. Then, this AV control signal is detected by the V section data processing circuit 33. Therefore, each AV device can be controlled via the AV signal line without connecting the AV bus, and the wiring process can be simplified.

[0010]

1 is a block diagram showing the configuration of an embodiment of an AV system according to the present invention. In this example,
The VT is connected to the AV center 1 consisting of a television receiver.
R2 and VTR3 are connected to each other via AV signal lines.

The AV center 1 has an AV switch 1
1 is provided, and the signal input from the AV terminal P1 is supplied to the pin with the number 6. Furthermore, the output of the tuner 12 is input to the pin number 5 and the signal input from the AV terminal P2 is input to the pin number 7 of the AV switch 11.

Further, the AV switch 11 is adapted to select a signal input from any of the pins 5 to 7 and output it to at least one of the pins 1 to 4. The pin 1 is connected to the control data insertion circuit 16, and the output of the control data insertion circuit 16 is the AV terminal P1.
It is designed to be supplied to. The output of the pin 2 is supplied to the video signal processing circuit 13. Further, the output of the pin 3 is supplied to the V section data processing circuit 15, and the output of the pin 4 is supplied to the control data insertion circuit 17. The output of the control data insertion circuit 17 is adapted to be output from the AV terminal P2.

The output of the video signal processing circuit 13 is supplied to the adder 21, combined with the output of the OSD display IC 20, and output to the monitor 14. The microcomputer 18 controls each unit in the AV center 1 to execute a predetermined process. The RAM 19 appropriately stores data necessary for the microcomputer 18 to execute various processes.

The VTR 2 connected to the AV terminal P1 of the AV center 1 has a deck 31, and an AV signal reproduced from a magnetic tape (not shown) mounted therein is used as a control data insertion circuit 32. Is supplied to the AV terminal P1 of the AV center 1 via. Also,
The AV signal output from the AV terminal P1 of the AV center 1 is supplied to the deck 31 of the VTR 2 and the V section data processing circuit 33. The microcomputer 34 controls each part of the VTR 2 and executes various processes.

On the other hand, the VTR 3 connected to the AV terminal P2 of the AV center 1 is not shown in the drawing, but is VT.
It is constructed similarly to R2.

The video signal includes the vertical synchronizing signal shown in FIG. 2 (a) and the horizontal synchronizing signal shown in FIG. 2 (b).
Then, in Japan, as shown in FIG. 2 (c), this video signal is displayed on the 20th horizontal scanning line of the horizontal synchronizing signal within the vertical blanking period, and the video signal of the screen has an aspect ratio of 4: 3. WIDE-ID indicating whether it is a signal or a video signal of a screen having an aspect ratio of 16: 9 is superposed. Further, in the United States, as shown in FIG. 2D, a CAPTION (caption) signal is superimposed on the 21st horizontal scanning line within the vertical blanking period.

In this caption signal, as shown in FIG. 3, in order to decode the character code, a clock run-in signal (for decoding the data code) for 7 cycles of a frequency of 503 kHz for taking timing. Sync signal). Next to the clock run-in signal, a start code composed of 2 bits with a logic level of 0 is arranged, and further, data consisting of a 16-bit (2-byte) NRZ signal is arranged next to it. . Each byte of this data is a 7-bit ASCI
It is composed of an I code and a 1-bit parity code.

As a result, a line consisting of up to 32 characters can be converted into
It is possible to display 15 lines vertically in one screen.

In the closed caption broadcasting system, such caption information is multiplexed on the 21st horizontal scanning line (this system is called the field 1 mode), but the 284th horizontal scanning is performed. A method of multiplexing on a line (this method is called a field 2 mode) has also been proposed.

In addition, TELETEXT (teletext)
In the 17th and 18th (and 330th
Data (character information) is superimposed on the (th and 331st) horizontal scanning lines.

In any case, as shown in FIG. 2E, within the vertical blanking period in the first field, predetermined eight horizontal scanning lines of the tenth to twenty-first horizontal scanning lines are used. It is permitted to insert such various control signals on the scan lines. Therefore, also in the present embodiment, an AV control signal for controlling each AV device is superposed on a predetermined one of the eight horizontal scanning lines of the tenth to twenty-first horizontal scanning lines. ing.

However, as will be described later, in this embodiment, the character information for the caption system or the teletext is used as it is as the AV control signal. Therefore, in order to avoid confusion with the original character information, The superimposed position of the control signal is set to a position different from the original character information (for example, on the 19th horizontal scanning line).

As shown in FIG. 1, when another AV device is directly connected to the AV center 1, the address corresponding to each AV device is unnecessary as an AV control signal. However, for example, as shown in FIG. 4, a multi-disc player (M
DP) 41 is connected to the VTR 3, a video tuner 42 is further connected to the VTR 43 connected to the AV terminal P3 of the AV center 1, and a V
When TR44 is connected, MD
AV on P41, video tuner 42, or VTR 44
When the AV control signal is transmitted from the center 1, the VTR2,
Since it is transmitted via 3 or 43, it is not known to which AV equipment the control signal is output.
Therefore, in such a case, an address (ID) designating each AV device is added.

FIG. 5 shows the format of the AV control signal transmitted between the AV devices. As shown in the figure, for example, the AV control signal transmitted from the AV center 1 to the VTR 2 includes start data indicating the start of the AV control signal, the number of transmission data indicating the number of data to be transmitted, a command indicating the control content, and an error. Error correction data for correction, and edo (end o indicating the end of data)
f data) is transmitted.

Also, start data, the number of transmission data, reply data, error correction data, and eod are transmitted from the VTR 2 to the AV center 1.

FIG. 6 shows the AV center 1 to VTR 2 and VT.
The procedure for transmitting an AV control signal to R3 is shown. As shown in the figure, when a command is output from the AV center 1, the microcomputer 18 controls the control data insertion circuit 16 via the internal bus, and, for example, the 19th position within the vertical blanking period of the video signal. Character information such as a caption signal as shown in FIG. 3 is superimposed on the horizontal scanning line as an AV control signal. This AV control signal is transmitted from the AV terminal P1 of the AV center 1 to the VT via the path B of the AV signal line.
It is transmitted to R2.

The V section data processing circuit 33 of the VTR 2 is
The caption signal on the 19th horizontal scanning line of the input video signal is separated, decoded, and output to the microcomputer 34. The microcomputer 34 stores the input command in a built-in memory as needed.

As shown in FIG. 3, it is assumed that the control signal is superimposed only on the 19th horizontal scanning line of the video signal for one frame constituted by 525 horizontal scanning lines, for example. Only a 2-byte signal can be transmitted in one frame. Therefore, the control data is appropriately stored in the memory and held until the detection of eod from the start data. When one set of control data is obtained, the microcomputer 34 decodes the code,
The process corresponding to the code is executed.

Then, the microcomputer 34 controls the control data insertion circuit 32 via the internal bus to make the first video signal.
Insert reply data on the ninth horizontal scan line. This reply data is transmitted from the VTR 2 via the path A of the AV signal line,
It is supplied to the AV terminal P1 of the AV center 1. This signal is sent from the AV switch 11 to the video signal processing circuit 1
3 and the V section data processing circuit 15 as well. When a normal video signal is input, the video signal processing circuit 13 processes this video signal and outputs it to the monitor 14 via the adder 21 for display.

On the other hand, the V section data processing circuit 15
Extracts the AV control signal (caption character information) on the 19th horizontal scanning line from the video signal supplied from the AV switch 11 and decodes it. And
The decoded result is output to the microcomputer 18 via the internal bus. As in the case described above, the microcomputer 18 appropriately supplies this data to the RAM 19 and stores it therein.

When a control signal for a predetermined number of frames is received and one set of control signals is obtained, the microcomputer 18 executes a predetermined process corresponding to the control signal.

Further, the microcomputer 18 outputs to the VTR 3 an inquiry command as to whether or not there is control data, for example. At this time, the control data insertion circuit 17 superimposes the inquiry command on the video signal and outputs it from the AV terminal P2. This inquiry command is supplied to the VTR 3 via the path D of the AV signal line.

When the VTR 3 receives this inquiry command, if there is no control data, the VTR 3 superimposes a reply to that effect on the video signal and outputs it. This signal is AV
Via the path C of the signal line, the AV terminal P2 of the AV center 1
Entered in. Then, this signal is further supplied to the AV switch 11. At this time, the AV switch 11
The internal circuit is switched so that the signal input from pin 7 is output to pin 2 or pin 3. Then, the section data processing circuit 15 receives the control signal from the video signal supplied from the AV switch 11, and outputs the reception result to the microcomputer 18.

Further, the microcomputer 18 controls the control data insertion circuit 16 when transmitting the inquiry command to the VTR 2 as well, and controls the VTR 2 via the path B of the AV signal line.
An inquiry command is output to TR2. VTR2
When this inquiry command is received, the reply (for example, a reply that it does not have control data) is
Output to the AV center 1 via the route A of the V signal line.

The V section data processing circuit 15 and the OSD display IC 20 originally use the circuit for processing the closed caption signal as it is. That is, when the tuner 12 receives a television broadcast, the received signal is output from the pin 5 to the pin 2 of the AV switch 11 and supplied to the video signal processing circuit 13. And
After being processed there, it is output to the monitor 14 via the adder 21 and displayed.

On the other hand, a part of the video signal is also supplied to the V section data processing circuit 15, where the caption signal is detected and the detection result is supplied to the microcomputer 18.
The microcomputer 18 controls the OSD display IC 20 according to the detection result to output a predetermined character. This character is output to the adder 21 and superposed on the video signal supplied from the video signal processing circuit 13. As a result, characters are displayed on the monitor 14 so as to be superimposed on the video image output by the video signal processing circuit 13.

Thus, in this embodiment, originally,
The V section data processing circuit 15 and the OSD display IC 20 provided for processing the closed caption signal
The control data generated by the control data insertion circuit 32 (same for 16 and 17) is in the same format as that of the caption signal so that the above can be used as it is. However, the insertion position is on the 21st horizontal scanning line in the case of the caption signal, whereas it is on the 19th horizontal scanning line in this embodiment. Therefore, it is possible to identify from the position of the horizontal scanning line to be detected whether it is a caption signal or an AV control signal.

By using the circuit for caption signal processing as it is for AV control signal processing, it is not necessary to specially design and add a special circuit for AV control signal processing. It becomes possible to realize a lower cost device.

It should be noted that each AV device is connected to the AV device via the AV signal line.
Even if the control signal is output, each AV device may not be able to receive the AV control signal for some reason. For example, as shown in FIG. 7, the AV center 1 is a VTR.
2, when a command is sent via route B,
If VTR2 fails to receive this command, VT
R2 will not output a reply to the AV center 1. After outputting the command, the AV center 1 waits for a reply from the VTR 2 for a predetermined time. And
If there is no reply after a predetermined time, the VTR
Send a command to 2. If the same thing is repeated three times and no reply is received even after repeating three times, whether the VTR 2 is broken in the AV center 1
Alternatively, it is processed as if it does not exist.

Alternatively, as shown in FIG. 8, when the VTR 2 receives the command output from the AV center 1,
If the signal is in error, the VTR 2 outputs to the AV center 1 that the received signal is in error.
Upon receiving this report, the AV center 1 repeatedly transmits the same command three times. When the VTR2 reports a reception error even after repeatedly transmitting three times, the AV
The center 1 processes as if the VTR 2 could not receive this command.

Further, as shown in FIG. 9, when the AV center 1 sends a command to the VTR 2 and the VTR 2 sends a reply to the command, the AV center 1
Receives this reply, but when the reply cannot be received successfully, the AV center 1 sends the same command a maximum of three more times. Then, in any case, when a reception error occurs, the AV center 1 executes the process of giving up the reception of the reply.

Although the circuit for processing the closed caption signal is used as it is in the above embodiment, it is also possible to use the circuit for processing the teletext format. In this case, since a maximum of 40 characters can be sent, many commands can be sent at one time.

FIG. 10 shows an embodiment in which the AV system of the present invention is applied to, for example, a television receiver arranged in each room of a hotel. In this embodiment, a television receiver having the structure shown in FIG. 10 is arranged in each room. Television receiver (TV)
Reference numeral 51 denotes an AV switch 71, a tuner 72, a video signal processing circuit 73, a monitor 74, a V section data processing circuit 7
5, microcomputer 78, RAM 79, OSD display IC 80,
And an adder 81, which include the AV switch 11, the tuner 12, the video signal processing circuit 13, the monitor 14, the V section data processing circuit 15, the microcomputer 18, the RAM 19, the OSD display IC 20, and the adder in FIG. It corresponds to the container 21, respectively.

In this embodiment, a transmission data modulation circuit 61 and a transmission / reception band separation processing circuit 62 to which the RF signal output from the transmission data modulation circuit 61 is input are provided in place of the control data insertion circuit 16 in FIG. . Also, TV5
1 has an interface 63 connected to the printer 52. Further, a touch sensor 66 is provided on the front surface of the monitor 74 and is connected to the microcomputer 78 via the interface 67.

At the front of a hotel, for example, an AV center having the structure shown in FIG. 1 is arranged. Although not shown in FIG. 1 in the AV center,
An input unit such as a keyboard that can input a predetermined message is provided. Then, when a predetermined message is input from the AV center, the message is superimposed on the video signal. Since this data is the original character data, its superposition position can be on the 21st horizontal scanning line (that is, it can be superposed as normal caption information), but on the 19th horizontal scanning line. Good.

This video signal is further converted into an RF signal and supplied to the TV 51 in each room via the CATV line.

In the TV 51, the RF input through the CATV line in the transmission / reception band separation processing circuit 62.
The signal is separated from the transmission signal and output to the tuner 72.
The tuner 72 demodulates the input RF signal, converts it into a video signal, and supplies it to the AV switch 71.

The AV switch 71 receives the input video signal from the bidet signal processing circuit 73 and the V section data processing circuit 7.
Output to 5. When the input is a normal video signal, this video signal is processed in the bidet signal processing circuit 73, output to the monitor 74 via the adder 81, and displayed.

On the other hand, the AV control signal superimposed on the video signal is separated and detected by the V section data processing circuit 75 and output to the microcomputer 78. The microcomputer 78 uses the OS to generate a character corresponding to the detected control signal.
The D display IC 80 is controlled. The OSD display IC 80 generates a predetermined character, outputs it to the adder 81, and superimposes it on the video signal. Therefore, the characters (message) input at the front are displayed on the monitor 74.

When it is desired to distribute this message to a predetermined room instead of all the rooms of the hotel,
The room number (address) may be included in the AV control signal. The TV 51 of each room stores each room number in the memory built in the microcomputer 78, and when a message of the same room number as the stored room number is received,
The message is stored in the RAM 79 and displayed on the monitor 74.

When the user of each room confirms the message displayed on the monitor 74, the monitor 74
Touch the predetermined position above. The touch sensor 66 detects this, and outputs a detection signal to the microcomputer 78 via the interface 67. At this time, the microcomputer 78 controls the transmission data modulation circuit 61, superimposes an AV control signal indicating that the message is confirmed on the video signal, and further converts the video signal into an RF signal. This RF
The signal is transmitted via the transmission / reception band separation processing circuit 62 to the CATV.
It is output to the line and to the AV center (front). At the AV center (front), this confirmation signal is displayed on the monitor, so that it can be confirmed that the message has been distributed to the users in the room.

When the user touches a predetermined position on the touch sensor 66 as necessary, the microcomputer 78
The printer 52 is controlled via the interface 63, and R
The printer 52 is caused to print the message stored in the AM 79.

FIG. 11 shows the state of transmission and reception of control signals in the embodiment of FIG. As shown in FIG.
The center 1 outputs start data and the number of transmitted data. Following that, OSD-DATA1 to OSD-
DATA3 is output, and further the error correction data and finally eod are output. It goes without saying that the OSD data is transmitted by the required number.

When such control data is output from the AV center 1 to the TV 51, the TV 51 outputs start data, the number of transmitted data, reply data, error correction data,
And eod are output to the AV center 1.

In this embodiment, for example, the TV 51
When the power of the device is turned off, the message can be surely distributed to each room by sending a command to turn on the power as control data.

Further, in the case of distributing a message to all the rooms in case of emergency, the power of the TV 51 in each room is forcibly (automatically) turned on, and the address is not designated (common to each room). Specify the address) and output the message. As a result, the power of the TVs 51 in all the rooms is automatically turned on and the message is displayed there.

Further, in the above-described embodiment of FIG. 10, in addition to the message, control data concerning image quality such as image brightness, contrast, hue, color and sharpness, and control data such as volume and sound quality are transmitted and received. It is also possible to do so. Thus, for example, during an emergency broadcast, it is possible for the user of each room to notify the user of a volume higher than the volume set in each room. Furthermore, it becomes possible for the producer of the video signal to set an appropriate volume appropriately for the scene, and to allow the viewer to monitor the video image more effectively.

FIG. 12 shows still another embodiment. In this embodiment, a laser disc player (LDP) 91 is connected to the TV 51. TV51
Is basically configured similarly to the case shown in FIG. That is, the AV switch 71 to the adder 81 correspond to the AV switch 11 to the adder 21 in FIG. However, in this embodiment, the monitor 74 is shown in FIG.
As in the case of 0, the touch sensor 66 is provided and connected to the microcomputer 78 via the interface 67.

Further, the LDP 91 is provided with a reproducing section 101, a control data inserting circuit 102 to which the AV signal reproduced by the reproducing section 101 is input, a V section data processing circuit 103, a microcomputer 104, and a RAM 105.

In this embodiment, for example, LDP9
The microcomputer 104 of No. 1 controls the control data insertion circuit 102, and as shown in FIG. 13, the start data, the number of transmitted data, the current reproduction address, the play start addresses 1 to 5,
Generate error correction data, eod. This control data is input to the AV switch 71 via the path C, and then supplied to the V section data processing circuit 75. The V section data processing circuit 75 reads this control data and supplies the read result to the microcomputer 78. Microcomputer 7
8 stores this data in the RAM 79 as appropriate.

Then, the data stored in the RAM 79 is read at a predetermined timing, and the OSD display IC 80 is
Control according to the data. And OSD display I
A character corresponding to the input data is generated in C80, output to the adder 81, superposed on the video signal, and displayed on the monitor 74.

FIG. 14 shows this display state. The flower image is a video image reproduced from the current reproduction address of the video disc mounted in the reproduction unit 101.
Then, the numbers 0 to 5 and the titles corresponding to the previous screen, tulip, dahlia, gladiolus, cyclamen, and lily are displayed.

As shown in FIG. 15, for example, as shown in FIG. 15, the play start addresses 1 to 5 are assigned to these titles 1 to 5, respectively.
Is supported. The play start address corresponding to the title of number 0 corresponds to the current reproduction address of the display screen immediately before.

That is, the LDP 91 generates the contents of the video disc mounted in the reproducing unit 101 and the information of the title at each reproduction address position, and outputs it as an AV control signal to the TV 51. The TV 51 receives the data in the V section data processing circuit 75 via the AV switch 71, and stores the received data in the RAM 79 as needed. Then, in accordance with the stored control data, the OSD
The display IC 80 is controlled, and the monitor 74 is controlled via the adder 81.
Display a predetermined character on. This allows the user to select which address position (number in FIG. 14)
It is possible to know which reproduction position can be selected.

Then, for example, when the user touches the number 5 in FIG. 14, this is detected by the touch sensor 66, and the microcomputer 7 is detected via the interface 67.
The detection signal is input to 8 (or a predetermined number may be input from a remote controller not shown). As shown in FIG. 15, this number 5 corresponds to the play start address 5. At this time, the microcomputer 78
Controls the control data insertion circuit 77 and outputs start data, the number of transmission data, play start address 5, error correction data, and eod to the LDP 91 via the AV signal line.

The LDP 91 is a V section data processing circuit 10
3, the control data is detected, the detection result is appropriately stored in the RAM 105, and the stored result is stored as
The microcomputer 104 controls the reproducing unit 101, and in the present case,
Playback is started from the play start address 5.

This reproduction signal is the control data insertion circuit 10
2 is supplied to the AV switch 71 of the TV 51 via
It is output from the AV switch 71 to the monitor 74 via the video signal processing circuit 73 and the adder 81, and is displayed. This causes a lily video image to be displayed, for example, as shown in FIG.

At this time, the microcomputer 104 controls the control data insertion circuit 102 to output the start data, the number of transmitted data, the current reproduction address, the play start addresses 1 to 5, the error correction data, and the eod as the control data. . This control data is superimposed on the video signal,
It is supplied to the V section data processing circuit 75 via the AV switch 71 of 51 and detected there. Microcomputer 78
Responds to this detection result by controlling the OSD display IC 80 to display a predetermined character and output it to the monitor 74 via the adder 81 to display it. As a result, the characters 0 to 5 in FIG. 16 and the corresponding screens as the title, the previous screen, the shape of the bulb, the planting time, the world distribution map, the lily history, and the lily type characters are Yuri video images. Will be displayed superimposed on.

In the same manner, the user further confirms that
If any of the numbers 0 to 5 in 6 is selected, the video image of the play start address corresponding to the selection is L
It is reproduced on the DP 91 and displayed on the monitor 74.

In this way, it is possible to easily construct an interactive system for education.

Furthermore, the control data can be transmitted with a concealed bit added. When this conceal bit is added, the transmitted character is stored in the memory on the receiving side, but the character is not displayed on the monitor.
For example, as shown in FIG. 17, when two questions of FLOWER name and main production area are transmitted as an AV control signal and an AV control signal as an answer thereto is transmitted with a conceal bit added, the answer is Do not show. Then, the relive button 11 at a predetermined position on the monitor
When the user operates 1, the concealed state is released,
For example, the answer is displayed as shown in FIG. In the embodiment shown in FIG. 18, Casablanca (Yuri) is displayed as the FLOWER name, and Japan / Netherlands is displayed as the main production area.

Then, in the state of FIG. 18, when the user operates the re-live button 111 again, the state returns to the state shown in FIG.

Not only is this concealed character simply used for display, but the AV control signal itself can also be transmitted as this concealed character. In this case, a separator is placed after a normal character (for example, the FLOWER name in FIG. 18), and then a concealed character (see FIG. 1).
Casablanca in 8) will be transmitted.

Furthermore, as shown in, for example, FIG.
When VTR2 is connected to center 1, V
A power on / off signal, a recording start / end signal, a time signal, and the like can be superimposed on a video signal and transmitted to the TR2 through an AV signal line.

For example, when a recording of a sports program is reserved, the VTR 2 starts the recording operation when a predetermined time is reached. However, at the program broadcast start time or the program broadcast end time, which is scheduled in advance, the program broadcast is started. The time may be shifted without starting or ending. In such a case, in the conventional reservation recording, the broadcast of the time zone designated by the original time is recorded as it is. For example, on the broadcast station side, a program start signal of a predetermined program is generated. If the program end signal is transmitted and the VTR 2 is set to perform the reservation operation from the time when the predetermined program start signal is received until the time when the predetermined program end signal is received, Even if the broadcast time is shifted, the desired program can be surely reserved and recorded.

Furthermore, when the timer recording incorporated in the VTR 2 is used as a reference and the timer recording is started or ended, if the timer set time itself is advanced or delayed, correct timer recording is performed. I can't. Therefore, if the time information is transmitted as a control signal, the VTR 2 receives the time information, and the reserved recording operation is started based on this time information.
As compared with the case where the timer recording built in the VTR 2 is used as a reference, the timer recording can be surely recorded.

In addition, at the time of transmitting super-low bass, a command for vibrating the chair on the viewer side is transmitted as a control signal, and the viewer side receives this control signal to convert a dedicated chair or cushion into a heavy bass signal. It is possible to drive correspondingly. In multi-television, that is,
When a plurality of monitors are arranged in the vertical direction and the horizontal direction and each television is displayed at the same time, only the AV signal line is required for the wiring, and the control signal line is not required, which simplifies the wiring process.

Further, for example, the setting of the time of each AV device, the start or the end of the recording or reproducing of the VTR can be transmitted from the broadcasting station side as a control signal.

Further, for example, a personal computer can automatically download programs and data.

It is also possible to automatically set the surround mode of each AV device to a predetermined mode. In addition, it is possible to read a card key in a hotel room, read a credit card or various contract cards, and check them at the center.

It is also possible to make the character a double height character.

[0082]

As described above, in the AV system of the present invention, each AV device is provided with the superimposing means for superimposing the AV control signal detectable by the detecting means within the predetermined horizontal scanning period. It is not necessary to specially design and add the circuit of, and the AV system can be constructed with a low-cost device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of an AV system of the present invention.

FIG. 2 is a diagram illustrating a superposition position of a control signal in the AV system of the present invention.

FIG. 3 is a diagram showing a waveform of a caption signal.

FIG. 4 is a block diagram showing another configuration example of the AV system of the present invention.

5A and 5B are diagrams for explaining the exchange of control signals in the embodiment of FIG.

FIG. 6 is a diagram illustrating a procedure of transmitting / receiving a control signal in the embodiment of FIG.

FIG. 7 is a diagram illustrating a procedure of transmitting / receiving a control signal in the embodiment of FIG.

FIG. 8 is a diagram illustrating a procedure of transmitting / receiving a control signal in the embodiment of FIG.

FIG. 9 is a diagram illustrating a procedure of transmitting / receiving a control signal in the embodiment of FIG.

FIG. 10 is a block diagram showing still another configuration example of the AV system of the present invention.

FIG. 11 is a diagram for explaining the exchange of control signals in the embodiment of FIG.

FIG. 12 is a block diagram showing still another configuration example of the AV system of the present invention.

FIG. 13 is a diagram for explaining the exchange of control signals in the embodiment of FIG.

FIG. 14 is a diagram illustrating a display example in the embodiment of FIG.

FIG. 15 is a diagram illustrating a display example in the embodiment of FIG.

16 is a diagram illustrating a display example in the embodiment of FIG.

FIG. 17 is a diagram illustrating a concealed display state.

FIG. 18 is a diagram illustrating a display state in which the concealment is released.

FIG. 19 is a block diagram showing another configuration example of the AV system of the present invention.

[Explanation of symbols]

 1 AV Center 2, 3 VTR 11 AV Switch 13 Video Signal Processing Circuit 14 Monitor 15 V Section Data Processing Circuit 16, 17 Control Data Insertion Circuit 18 Microcomputer 19 RAM 20 OSD Display IC 21 Adder 31 Deck 32 Control Data Insertion Circuit 33 V Section data processing circuit 34 Microcomputer

Claims (3)

[Claims] 1. An AV signal line connected to each other,
In an AV system composed of a plurality of AV devices that send and receive AV control signals via a signal line, the AV device is provided with 10th to 21st positions within a vertical blanking period of a video signal.
A detection means for detecting character information superimposed in a predetermined horizontal scanning period of the second and the AV control signal detectable by the detection means in a horizontal scanning period different from the predetermined horizontal scanning period. And a superimposing unit for outputting the AV control signal to the AV signal line by superimposing the AV control signal in the predetermined horizontal scanning period in the first AV device. An AV system, wherein the AV control signal is detected from the video signal received via a signal line, and a predetermined operation is performed in response to the detected AV control signal. 2. The AV control signal includes power on / off of the second AV device, program start / end, recording start / end, reproduction start / end, reproduction position,
At least one of time, image quality, volume, sound quality, and confirmation 1
The AV system according to claim 1, wherein the AV system is a signal indicating one of the two. 3. The AV system according to claim 1, wherein the AV control signal includes concealment information for concealing a display.