JPH09163309A - Av system composed of display device having decode function connected with plural av equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AV system with which a video signal and/or an audio signal can be decoded even with only one cable connected and the decoders of plural functions can be used without increasing input/output terminals by suitably switching plural kinds of decoders corresponding to the format of video signal and/or audio signal from connected AV equipment. SOLUTION: The AV system provided with a display device connected with plural AV equipment is composed of plural AV equipment connected with a control center CC through a 1394 IF cable C. The control center CC receives and separates data from the connected AV equipment through a 1394 interface 24 and these data are sent to a CPU 12 and a data separator switcher 25. When these data are received, the CPU 12 controls the data separator switcher 25, etc., by fixing the method of compression or the like contained in the video format.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AV system having a function of selecting an appropriate decoder based on a signal from an AV device and decoding it in a display device provided with a decoder, for example, a television receiver. .

[0002]

2. Description of the Related Art In the prior art, a display device connected to a plurality of AV devices, for example, a video display such as a television receiver, an AV device such as a video or audio device is connected, and a video signal and an audio signal of each AV device are connected. For inputting, an analog signal input and a digital signal input are handled differently.

That is, in the case of analog signal input / output,
Depending on the format of the video signal, the respective input terminals such as the composite video terminal, the S terminal, the RGB input terminal, etc. are properly connected and the video / audio is viewed.

In the case of digital signal input / output, the original video signal and the stream identifier indicating the format of the video signal can be simultaneously transmitted in a time-division manner, so that various formats can be dynamically changed without changing the connection of the signal cable. The signal of is decoded by the decoder and the video / audio is viewed.

For this decoder, a decoder for decoding a plurality of types of decoding is prepared, and a method of distributing streams to each of them and a method of operating under software control to switch various programs to switch various streams. Two types are known, one that can be decoded.
In any case, the decoder and the stream have a one-to-one relationship.

[0006]

However, the decoder for decoding the compressed video signal and audio signal in the prior art described above works effectively for decoding by a specific compression method, but the digital signal is not effective. However, there is a problem in that the number of types of decoders for decoding methods, for example, video signal compression methods, increases, and it is not possible to cope with such transmission.

Therefore, even if the types of decoder compression methods increase, there is a problem that a display device having a decoder capable of appropriately performing decoding can be solved without increasing the number of input / output terminals. .

[0008]

In order to solve the above-mentioned problems, an AV system comprising a display device having a decoding function connected to a plurality of AV devices according to the present invention,
An AV system including a plurality of AV devices and a display device having a decoding function connected to the AV devices, wherein the decoding function includes a plurality of types of decoders, and is provided in a video stream and / or an audio stream from the AV devices. That is, the decoder is appropriately selected from a plurality of types of decoders based on the signal to operate.

The video stream and / or audio stream from the AV equipment is composed of at least a video signal and / or an audio signal and a stream identifier having a decoding system included between the video signal and / or the audio signal,
The plurality of types of decoders are an AV system including a display device having a decoding function, which is connected to a plurality of AV devices configured by video and / or audio signal compression methods, for example, MPEG method and SD method decoders.

Further, the AV system is an AV system comprising a plurality of AV devices and a display device having a decoding function which is connected to the AV devices through a digital interface, and the decoding function includes a plurality of types of decoders. That is, the decoder is appropriately selected and operated based on the signal in the video stream and / or the audio stream from the AV device.

A video stream and / or an audio stream from the AV equipment is composed of at least a video signal and / or an audio signal and a stream identifier having a decoding method which is inherent between the video signal and / or the audio signal. The type of decoder is a decoder of a compression method of a video signal and / or an audio signal, for example, MPEG (Moving).
Picture Image Coding Exp
erts Group) method and SD (Standard)
(Definition) method decoder.

The display device having a decoding function, which is formed by connecting a plurality of AV devices having the above-described structure, can appropriately compress video signals and audio signals from a plurality of types of formats without changing the connection of cables of signal input / output terminals. You will be able to decrypt.

If the decoder provided in the display device is adapted to the new format, even if the display device, for example, a television receiver, does not have to be newly purchased, even if the format uses a new compression technique. , It becomes possible to decode video and audio signals in the new format.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of an AV system comprising a display device having a decoding function connected to a plurality of AV devices according to the present invention is as shown in FIG. Standard-compliant digital interface (hereinafter 1394I
F)), the display device is provided with a plurality of types of decoders, and an appropriate decoder is appropriately selected and decoded based on the compression method of the input video signal and / or audio signal. It is an AV system that does.

The 1394IF will be described here. The 1394IF is a so-called serial bus capable of connecting a plurality of AV devices with a daisy chain, and each AV device forms a node in the 1394IF. Branches can also be issued from each node. Connection of each AV device is arbitrary unless a loop is formed.

That is, in FIG. 1, two branches are output from the television receiver TV, one of which is connected to the digital camcorder DCAM, and the other branch is connected to the digital video recorders VCR-A and VC.
RB, VCR-C and digital video disc DV
D, game console G, telephone TEL, fax FA
X, a music disc exchange MDC, a digital audio tape recorder DAT, a compact disc exchange CDC, a printer P, and an infrared device IRU are connected to the daisy chain by a 1394 IF cable C.

The 1394IF having such a function is
6-core 1394 IF cable C, the same connector connected to both ends of the cable, and L connected to each connector
It is composed of an SI physical layer, an LSI link layer connected to the physical layer, and a transaction layer connected to the link layer. The transaction layer consists of firmware.

The 1394IF cable C is composed of two pairs of shield wires and two power wires. Two pairs of them are a data line and a strobe line, which are used for data transfer and used as other power supply lines. Therefore, even if the power is off, the signal can be bypassed, so that the signal can be sent to a device ahead of the device where the power is off.

The connector has a built-in transceiver, and the transceiver and the 1394IF cable C form a repeater. One end of the physical layer is 1394IF
It is connected to the cable C and the other end is connected to the link layer. The physical layer encodes the electric signal input from the 1394IF cable C and sends the encoded signal to the link layer, and also decodes the code data received from the link layer into an electric signal and outputs the electric signal.
It is sent to the 94IF cable C. The physical layer also performs bus arbitration, which will be described later.

The link layer creates a packet based on the data encoded in the physical layer, transmits the packet to the transaction layer, and decodes the packet received from the transaction layer. The link layer also controls the packet transfer cycle.

The 1394IF configured as described above is
It has the following features. (1) Since all AV devices are connected serially, all AV
The equipment is A provided in the above conventional television receiver TV.
It is possible to communicate with other AV equipment without the need for a switching connection such as a V-switcher. (2) The AV equipment in the AV system is not fixed, and can be freely attached or detached at any position in the AV system by inserting / removing the connector. At this time, the ID of each AV device is automatically reset.

(3) It has a bus arbitration function for preventing a specific AV device from monopolizing the serial bus. This transfers data in packet units, and the maximum packet length is 512 bytes (1
In the case of a transfer rate of 00 Mbit / sec, it corresponds to about 40 μsec). Each AV device transmits packets for each assigned time in the order of designated node numbers.

(4) Packets are not allowed to be transferred other packets at regular time intervals until they are sent from the link layer and the transfer is completed. Each AV
When the device receives the packet, the device determines whether or not the data is necessary for itself, and performs processing or ignores it based on the determination result.

(5) Packets include normal packets, urgent packets of high priority, and isochronous packets of higher priority, which will be described later. (6) Since the 1394IF cable C is thin and the connector is small, it is easy to route the 1394IF cable C and attach / detach the connector. Also, the cost is low.

(7) The signal transfer speed is higher than that of the conventional serial transfer. This is because a signal is sent by serial transfer (transfer for each bit) using a pair of data lines and a pair of strobe lines, and "when the potential of either the data line or the strobe line changes, This is because the data is read by the DS link method according to the rule of "reading the data of." This DS link system is to cope with the temporal fluctuation of the potential of the data line. This eliminates the need to insert a start bit and a stop bit before and after data as in the conventional serial transfer (for example, RS232C), thus improving the transfer speed.

Next, a description will be given of the AV system consisting of a display device connected to a plurality of AV devices connected by a digital interface conforming to the IEEE 1394 standard, mainly on the control center CC side of the television receiver.

In this embodiment, IEEE13
Although the description is based on the 94 standard, it is needless to say that the present invention is not limited to this and includes all that conform to this standard.

As shown in FIG. 2, an AV system having a display device connected to a plurality of AV devices includes a control center CC and a plurality of AV devices (for example, a digital video recorder VCR) connected by a 1394 IF cable C (not shown). ) And.

The control center CC is the TV circuit 1
And a control circuit 11 and a 1394 interface 24.

The TV circuit 1 has a video signal processing system and an audio signal processing system, like a normal television circuit. The video signal processing system is a 1394 interface 24.
MPE for decoding digital video signals input from
G video decoder 2A, SD video decoder 2B, and M
Video decoder 2A for PEG or video decoder 2B for SD
D that converts the video signal decoded by
A / A converter 3 and a GUI (graphic user interface) for superimposing an analog video signal converted by the D / A converter 3 and a message signal from a display controller 15 described later Image multiplexing processing section 4, display processing section 5 for reorganizing the image data processed by the image multiplexing processing section 4 for display, and image display for displaying the output of the display processing section 5 on a screen such as a cathode ray tube. And machine 6.

The audio signal processing system of the TV circuit 1 is
The audio decoder 7 for decoding the digital audio signal input from the 394 interface 24, the D / A converter 8 for converting the audio signal decoded by the audio decoder 7 into an analog signal, and the D / A converter 8 A voice signal amplifier 9 for amplifying an analog voice signal, and a speaker 1 for converting the voice signal amplified by the voice signal amplifier 9 into a sound.
It consists of 0.

The control circuit 11 includes a CPU 12 and a CPU 1.
2 and the 1394 interface 24, the bus 13, the video decoders 2A and 2B, and the audio decoder 7.
I / O circuit 14 interposed between the bus 1 and the bus 13
3, a display controller 15 and a VRAM 16 interposed between the image multiplexing processing unit 4 and the image multiplexing processing unit 4, a RAM 17 connected to the bus 13, a timer 18 connected via an I / O circuit 23, a ROM 19, A remote control signal decoder 20 that receives and decodes a remote control signal and data from the bus 13, and an I / O circuit 2 that transmits and receives data on the bus 13 to and from the remote control signal decoder 20.
1 and a portable remote control 22 for transmitting a remote control signal
And a compressed video signal sent via the 1394 interface 24 to either video decoder 2
It is composed of a data separation switcher 25 for switching between A and 2B.

The CPU 12 executes a program described later. The bus 13 is a normal CPU bus. Under the control of the CPU 12, the I / O circuit 14 controls the video decoder 2
It controls the input / output timing of A, 2B and the audio decoder 7. Further, the CPU 12 uses the stream identifier obtained by separating the video signal data received by the 1394 interface 24 into the stream identifier and the video signal.
Data separator switcher 25 for the corresponding video decoder
Control by switching.

The display controller 15 is a CPU
Under the control of 12, message data and the like for one screen of the receiver 6 are created on the VRAM 16 and sent to the image multiplexing processing section 4.

The RAM 17 is a working RAM for the CPU 12.
It is. The timer 18 is composed of a counter and counts real time. The ROM 19 is a read-only memory that stores programs.

The 1394 interface 24 is an IEEE
The circuit has an LSI circuit according to the E1394 bus standard and a connector 24a connected to this circuit. The plug of the 1394 IF cable C is inserted into the connector 24a. The function of the 1394 interface 24 is also installed on the side of the connected AV device.

The 1394IF cable C is a cable consisting of 6-core wires, and the control center CC and AV equipment are sequentially connected in series. 1394 IF
The cables C are sequentially connected so as not to form a loop as described above.

On the side of the control center CC having such a configuration, a plurality of AV data connected externally via the 1394 IF cable C, for example, a plurality of video data and audio data from the digital video recorder VCR are digital signals. Will be packetized and sent.

Video data which is this display signal,
That is, as shown in FIG. 4, the video stream has a structure in which a stream identifier is inserted at a place of a time-division-multiplexed compressed video signal.

The stream identifier is a header indicating that it is a stream identifier, and a video signal compression method, for example, a video compression method such as an MPEG method or an SD method.
It is composed of image quality and CRC. It should be noted that the configuration is not limited to such a configuration, and at least a configuration in which a compression method is specified may be used.

The processing of the video stream data having such a configuration will be described with reference to the flowchart shown in FIG.

First, the control center CC receives the 1394 interface 24 from the connected AV equipment.
Video stream data received via the stream identifier is separated into a stream identifier and a video signal, and the stream identifier is sent to the CPU 12 via the bus 13 (step ST
1).

When the CPU 12 receives the stream identifier, the CPU 12 determines the compression method included in the video format forming the stream identifier, such as the MPEG method or the SD method.

In the MPEG system, the data separator switcher 25 is switched to the MPEG video decoder 2A side, the video signal from the 1394 interface 24 is decoded and sent to the D / A converter 3 (step ST
2, ST3, ST4).

On the other hand, in the SD system, the data separator switcher 25 is switched to the SD video decoder 2B side,
The video signal from the 1394 interface 24 is decoded and sent to the D / A converter 3 (steps ST5, ST6,
ST7).

If neither the MPEG system nor the SD system is used, the fact that decoding cannot be performed is superimposed on the screen of the television receiver (step ST).
8).

In the embodiment, the image compression method is M
There are two types, PEG method and SD method, but the invention is not limited to these image compression methods, and a decoding function that is not a compression method, for example, a decoder that descrambles scrambled video may be used. That is.

Next, a method of decoding a compressed audio signal will be described. Control Center CC
As shown in FIG. 5, the structure is such that a data separator switcher 25 for voice is provided, and the other structure is similar to the structure shown in FIG. Omit it.

That is, the audio signal data separator switcher 25A is provided between the 1394 interface 24 and the audio decoder 7A.

With such a configuration, when a video stream and an audio stream from an AV device connected to the control center CC are received, 139
4 interface 24 separates the stream identifier and the video signal contained in the video stream, separates the audio signal and the stream identifier contained in the audio stream, and separates them for the video and the audio via the bus 13. The stream identifier is sent to the CPU 12.

The CPU 12 determines the data separator switcher 25, using the video and audio stream identifiers.
25A is switched and the video signal and the audio signal from the 1394 interface 24 are sent to the video decoders 2A, 2B and the audio decoder 7A to be decoded and the D / A converter 3,
Send to 8.

The audio decoder 7A is not limited to the compressed audio signal, but may be a decoder which demodulates a modulated audio signal and descrambles a scrambled audio signal, for example. That is.

[0053]

As described above, an AV system including a display device having a decoding function connected to a plurality of AV devices according to the present invention has a format of video signals and / or audio signals from the connected AV devices. By appropriately switching between a plurality of types of decoders corresponding to the format, even if there is only one cable connection, video signals and / or audio signals of a plurality of types of formats can be decoded without changing the connection. There is an effect that can be said.

Further, even in the case of connecting an AV device using a new decoding method, it is possible to easily cope with the new decoding method by changing or expanding the decoding function of the display device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an AV system in which a plurality of AV devices according to the present invention are connected.

FIG. 2 is a block diagram of a control center including the plurality of video decoders.

FIG. 3 is a flowchart showing a processing state of the video stream.

FIG. 4 is an explanatory diagram showing a configuration of the same video stream.

FIG. 5 is a block diagram of a control center including the plurality of video decoders and audio decoders.

[Explanation of symbols]

1 TV Circuit 2A, 2B Video Decoder 3 D / A Converter 4 Image Multiplexing Section 5 Display Processing Section 6 Image Receiver 7, 7A Audio Decoder 8 D / A Converter 9 Audio Signal Amplifier 10 Speaker 11 Control Circuit 12 CPU 13 Bus 14 I / O circuit 15 Display controller 16 VRAM 17 RAM 18 Timer 19 ROM 20 Remote control signal decoder 21 I / O circuit 22 Remote control 23 I / O circuit 24 1394 interface 25, 25A Data separator switcher VCR-A, VCR-B, VCR-C Digital Video Recorder TV Television Receiver VTR Video Tape Recorder DCAM Digital Camcorder DVD Digital Video Disc G Game Machine TEL Telephone FAX Fax MDC Music Disc Exchanger DAT Device Digital audio tape recorder CDC compact disk changer P printer IRU infrared device

Claims (10)

[Claims] 1. An AV comprising a plurality of AV devices and a display device having a decoding function connected to the AV devices.
In the system, the decoding function includes a plurality of types of decoders, and the decoders are appropriately selected and operated from the plurality of types of decoders based on signals in a video stream and / or an audio stream from the AV device. An AV system including a display device having a decoding function connected to a plurality of AV devices. 2. A video stream and / or an audio stream from the AV device is composed of at least a video signal and / or an audio signal, and a stream identifier having a decoding method included between the video signal and / or the audio signal. A comprising a display device having a decoding function connected to a plurality of AV devices according to claim 1.
V system. 3. An AV system comprising a display device having a decoding function, which is connected to a plurality of AV devices according to claim 1, wherein the plurality of types of decoders are composed of decoders of a compression method. 4. The AV comprising a display device having a decoding function connected to a plurality of AV devices according to claim 3, wherein the decoder of the compression method is a compression method of a video signal and / or an audio signal. system. 5. An AV system comprising a display device having a decoding function connected to a plurality of AV devices according to claim 4, wherein the video signal compression method is composed of an MPEG method and an SD method. 6. An AV system comprising a plurality of AV devices and a display device having a decoding function connected to the AV devices via a digital interface, wherein the decoding function comprises a plurality of types of decoders. From a display device having a decoding function connected to a plurality of AV devices, characterized in that the plurality of types of decoders are appropriately selected and operated based on a signal in a video stream and / or an audio stream from the AV device. AV system. 7. A video stream and / or an audio stream from the AV device is composed of at least a video signal and / or an audio signal and a stream identifier having a decoding system included between the video signal and / or the audio signal. 7. An A comprising a display device having a decoding function, which is connected to a plurality of AV devices according to claim 6.
V system. 8. An AV system comprising a display device having a decoding function connected to a plurality of AV devices according to claim 6, wherein the plurality of types of decoders are composed of a decoder of a compression method. 9. The AV comprising a display device having a decoding function connected to a plurality of AV devices according to claim 8, wherein the decoder of the compression method is a compression method of a video signal and / or an audio signal. system. 10. The AV system comprising a display device having a decoding function connected to a plurality of AV devices according to claim 9, wherein the video signal compression method is composed of an MPEG method and an SD method.