JPH1127660A - Signal processing unit and decoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smaller size signal processing unit that applies desired processing to a plurality of kinds of MPEG2-TS signals with easier operation and without chances of mis-operation. SOLUTION: A transmitted signal is given to a TS decoder 20 via an input terminal 10, from which the input signal is respectively given to a circuit that processes the input signal as a DVB signal and to a circuit that processes the input signal as a SDDI signal. An output of an input signal detection section of each circuit is given to an input setting circuit 40, and the input setting circuit 40 provides an output of a selection signal to a changeover device 50 to select a proper MPEG stream, and the changeover device 50 selects a proper signal among signals outputted from the TS decoder 20. The selected MPEG stream is given to a demultiplexer 60, in which the stream is demultiplexed into a video signal and an audio signal, and an MPEG decoder 70 applies MPEG decoding to the video signal and an MPEG decoder 80 applies MPEG decoding to the audio signal respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for converting a plurality of types of signals conforming to an MPEG transport stream
The present invention relates to a signal processing device for converting a PEG stream signal and a decoding device for further decoding the MPEG stream to generate digital video data and digital audio data.

[0002]

2. Description of the Related Art MPEG (Moving Picture coding Exper)
ts Group)
A stream called a transport stream is defined as a stream that can be multiplexed with a plurality of pieces of program data that are AV data (audio data and / or video data or any one of them) and provided for transmission such as broadcasting and communication. ing. A transmission system based on the MPEG2-TS, DVB
Digital broadcasting systems such as (Digital Video Broadcasing) have been developed.

As a format for transmitting this MPEG2-TS through a coaxial cable, a DVB serial (DVB-
ASI (Asynchronous Serial Interface)) and SDDI
(Serial Digital Data Interface) is used. DV
In B-ASI (hereinafter simply referred to as DVB), 8-bit parallel MPEG2-TS is first encoded into 8B10B, converted into 10BIT, and then a synchronization byte (Sync Byte) is inserted as a reference for serial conversion. -Serial conversion. SDDI is D1
SDI (Serial Digital Interface), which is a transmission format for digital VTRs such as
(SMPTE259M) (Society of Motion Picture and
This is an extension format of Television Engineers), which transmits MPEG2-TS in the payload area of this SDDI. DVB and SD
DI uses a 75 ohm coaxial cable,
It performs serial transmission at 270 [Mbps].

[0004] As described above, there are several types of signals as signals conforming to the MPEG2-TS, but devices such as an MPEG decoding device, an MPEG stream switching device, and a stream multiplexer are often used. In some cases, such a plurality of types of signals are received, converted into data of a predetermined format such as an MPEG stream, and the desired processing is performed. For a decoding device capable of receiving such multiple types of signals,
This will be specifically described with reference to FIG.

FIG. 7 is a block diagram showing the configuration of the decoding device 9. This decoding device 9 is the same as the DVB described above.
It is a device that can receive both signals and SDDI signals, and outputs a decoded digital video signal and digital audio signal, regardless of which format is received. As shown in FIG. 7, in the decoding device 9,
DVB serial signal input terminal 11 and SDDI serial signal input terminal 1 corresponding to DVB signal and SDDI signal, respectively.
2 are provided. Then, the operator connects the coaxial cable through which the signal is transmitted to the DVB serial signal input terminal 11 and the SDD based on the format of the transmitted signal.
Connect to one of the I serial signal input terminals 12. Also, which format signal is to be input is set in advance via the input setting switch of the input setting circuit 41.

When the coaxial cable is connected to the DVB serial signal input terminal 11, the DVB signal input via the coaxial cable is demodulated by the DVB decoder 91, and the input setting circuit 41 is switched by the switch 50. Are selected based on the settings in
Is input to When a coaxial cable is connected to the SDDI serial signal input terminal 12, the SDDI signal input via the coaxial cable is demodulated in the SDDI decoder 92, and the setting in the input setting circuit 41 is performed by the switch 50. It is selected on the basis of the above and input to the demultiplexer 60. Note that the DVB decoder 91 and the SDB
The DI decoder 92 converts each input signal into a signal of the same format.

The signal input to the demultiplexer 60 is MPEG data of the same format regardless of the format of the signal input to the decoding device 9. Therefore, this signal is separated into an MPEG video signal and an MPEG audio signal by the demultiplexer 60, and the separated MPEG video signal is decoded by the MPEG video decoder 70, converted into digital video data, and output. The separated MPEG audio signal is decoded by the MPEG audio decoder 80, converted into a digital audio signal, and output.

[0008]

By the way, a plurality of types of MPEG2-T such as the above-described decoding device are used.
In an apparatus for processing S, input terminals are provided in accordance with the types of signals that can be processed, so that, for example, the area of a panel provided with input terminals becomes large,
There is a problem that the whole apparatus becomes large. Therefore, there is a possibility that the input terminal to be connected may be mistaken, and in such a case, there arises a problem that appropriate output data cannot be obtained.

Further, since it is necessary to separately set the type of the input signal, there is a problem that the operation is troublesome. Also in this case, there is a possibility that the type of the signal to be set may be wrong, and in such a case, there arises a problem that appropriate output data cannot be obtained. Further, as illustrated in FIG. 7, since a demodulation circuit for each type of inputtable signal is provided, if the number of allowable signal types increases, the number of demodulation circuits must be provided by the number. However, there is a problem that the circuit scale becomes large.

[0010] Accordingly, an object of the present invention is to provide a signal processing for performing desired processing on a plurality of types of smaller MPEG2-TS signals that can be operated more easily without the possibility of erroneous operation. It is to provide a device. Also,
Another object of the present invention is to provide a simpler operation, a smaller size, a plurality of types of MPEs without the possibility of erroneous operation.
An object of the present invention is to provide a decoding device for decoding a G2-TS signal.

[0011]

In order to solve the above-mentioned problems, only one input terminal to which a transmission line having the same physical and electrical regulation is connected is provided, and a plurality of types of signals can be input. Made possible. Further, the type of signal input from the terminal can be identified, and a substantially effective process is automatically selected inside the apparatus based on the identification.

Therefore, the signal processing device of the present invention has
A device that receives any one of a plurality of types of AV signals conforming to the PEG2-TS specification and outputs a normal MPEG stream, and is provided in common for the plurality of types of AV signals. An input terminal to which any of these signals is input, signal identification means for identifying the type of the input signal, and conversion of the input MPEG2-TS signal into a normal MPEG signal based on the identification result Signal conversion means.

Further, the decoding apparatus of the present invention has
A device that receives any one of a plurality of types of AV signals conforming to the TS specification and outputs a normal MPEG stream, and is provided in common for the plurality of types of AV signals; An input terminal to which any of those signals is input, signal identification means for identifying the type of the input signal, and MP input based on the identification result
It has signal conversion means for converting the EG2-TS signal into a normal MPEG signal, and MPEG decoding means for decoding the converted MPEG signal.

The signals conforming to the MPEG2-TS are, for example, SDDI signals, DVB serial signals, various signals having different modulation methods, various signals having different scrambling methods, and the like, and can be input from the same physically identical input terminal. It is something. The AV signal to be processed is an audio signal and a video signal, and includes a case where only one of the signals is encoded and transmitted.

[0015] More specifically, the signal conversion means is provided with a plurality of individual signal conversion means for converting the signals into a signal of the predetermined format in accordance with a plurality of types of signals, and the signal conversion means is inputted based on a result of identification. Selecting means for validating the individual signal converting means according to the signal. Preferably, each of the plurality of individual signal conversion means performs a conversion process on the input signal, the signal identification means detects the individual signal conversion means whose conversion process has been appropriately performed, the The selecting means enables the detected individual signal converting means.

Preferably, the signal processing device and the decoding device according to the present invention each include an oscillator such as a phase locked loop (PLL) circuit for generating a clock of a predetermined frequency based on the input signal from the input signal. A circuit is further provided, and the plurality of individual signal conversion units perform the conversion based on the generated clock. More preferably, the signal processing device and the decoding device of the present invention each further include an equalizer that performs an equalization process for compensating a characteristic of a transmission path on a signal input from the input terminal. The signal identification unit and the signal conversion unit perform the identification process and the predetermined process on the signal on which the equalization process has been performed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described. In the present embodiment, the above-described DVB signal and S
The present invention will be described by exemplifying a decoding device that can receive both DDI signals, decodes an input signal, performs MPEG decoding, and outputs a digital video signal and a digital audio signal.

First, the MPEG2-TS input to the decoding device according to the present embodiment will be described. FIG.
FIG. 3 is a diagram illustrating a data structure of a packet constituting the EG2-TS and the MPEG2-TS. As shown in FIG.
PEG2-TS is composed of a 188-byte fixed-length transport packet (TS packet).
Each TS packet has a 4-byte fixed length packet header,
It consists of a variable length adaptation field and a payload.

Each flag of the packet header will be described. The sync byte is an 8-bit sync signal that the decoder
This is data for detecting the head of the S packet. The error indication (error indicator) is a flag indicating whether or not there is a bit error in this packet. The unit start indication flag indicates that the MPEG2-T
PES (Packetized Elemen)
tary Stream) is started. The transport packet priority is a bit indicating the priority of this packet.

The PID is a number for identifying a packet, and one stream is divided into payloads of a plurality of TS packets having the same PID and transmitted. The scrambling control flag is a flag indicating whether or not scrambling is performed on the TS payload and the type thereof. The adaptation field control flag is a flag for indicating the presence or absence of an adaptation field and a payload below the packet header. The cyclic count is data in which 4-bit data is continuously set between packets of the same PID, and is data for detecting whether or not a packet having the same PID is partially rejected halfway.

Next, a decoding apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 3 is a block diagram illustrating a configuration of a decoding device 1. The decoding device 1 has an input terminal 10, a transport stream (T
S decoder) 20, an input setting circuit 40, a switch 50,
It has a demultiplexer 60, an MPEG video decoder 70 and an MPEG audio decoder 80.

The input terminal 10 is a connection terminal to which a 75 Ω coaxial cable is connected. Via the input terminal 10, a DVB signal or SD
The DI signal is input.

The TS decoder 20 decodes the MPEG2-TS of the input DVB signal or SDDI signal, and decodes the decoded MPEG data and the DVB signal or SDDI signal.
A signal detection signal for the DI signal is output. This TS
The decoder 20 will be described in detail with reference to FIG.
FIG. 3 is a block diagram showing a configuration of the TS decoder 20. The TS decoder 20 includes a cable equalizer 21, a phase locked loop (PLL) circuit 22, and a DVB demodulation circuit 2.
3, DVB serial-parallel (DVBS-P) converter 24, 10B-8B converter 25, DVB input signal detector 26, SDDI demodulation circuit 27, SDDI serial-parallel (SDDIS-P) converter 28, data converter 29
And an SDDI input signal detection unit 30.

The cable equalizer 21 compensates for the characteristics of the coaxial cable through which the DVB signal or the SDDI signal has been transmitted, so that an appropriate transmission signal can be obtained. The properly reproduced signal is supplied to a PLL circuit 22 and a DVB demodulation circuit 23.
And DVBS-P converter 24. The PLL circuit 22 is a circuit that generates a clock based on a reception signal input from the cable equalizer 21, and includes a phase comparator, a DC amplifier, and a VCO (Voltage Controlled Oscillator).
Controlled Oscilator). The generated clock is input to each unit in the TS decoder 20 and used for the operation, and is also output from the TS decoder 20 to the inside of the decoding device 1.

The DVB demodulation circuit 23 includes a cable equalizer 2
1 is demodulated according to the DVB format. The demodulated signal is supplied to the DVBS-P converter 24.
Is output to The DVBS-P conversion unit 24 converts the signal demodulated by the DVB demodulation circuit 23 into a parallel signal using the clock generated by the PLL circuit 22, and converts the signal into a parallel signal.
Output to the 8B converter 25.

The 10B-8B conversion unit 25 is a DVBS-P
The signal converted in parallel by the conversion unit 24 is
A 10-8 conversion process is performed based on the B format,
Generated PEG data Generated MPEG data is T
The signal is output from the S decoder 20 and input to the DVB input signal detection unit 26.

The DVB input signal detecting section 26 is a 10B-8
It is checked whether or not the MPEG stream input from the B conversion unit 25 is an appropriate MPEG stream. If an appropriate MPEG stream is input, TS
It is determined that the DVB signal has been input to the decoder 20, and
The VB detection signal is output to the input setting circuit 40. In the present embodiment, the DVB input signal detection unit 26 is a 10B-8
By checking the signal restoration error in the B conversion unit 25, it is checked whether the MPEG stream is appropriate. 8B10B conversion is performed when the DVB signal is generated. However, since a temporal change is observed in 8B-10B, for example, no signal (all data is 0)
If data converted by 8B-10B is converted by 10B-8B, a data mismatch error occurs. The DVB input signal detector 26 detects this error to detect whether the output signal is appropriate.

The SDDI demodulation circuit 27 demodulates the received signal input from the cable equalizer 21 based on the SDDI format in the transmission system.
The demodulated signal is output to the SDDIS-P converter 28.
Specifically, the SDDI demodulation circuit 27 performs a descrambling process for restoring scrambled data. The SDDIS-P conversion unit 28
The signal demodulated by the DI demodulation circuit 27 is transmitted to the PLL circuit 22.
Is converted to a parallel signal using the clock generated in
The data is output to the data converter 29.

The data converter 29 converts the signal converted in parallel by the SDDIS-P converter 28 into an MPEG stream in the same format as the data generated by the 10B-8B converter 25 based on the SDDI format. Convert to The converted MPEG data is output from the TS decoder 20 and also input to the SDDI input signal detection unit 30.

The SDDI input signal detection unit 30 converts the MPEG stream input from the data conversion unit 29 into an appropriate M
Check whether the stream is a PEG stream,
When a PEG stream is input, it is determined that an SDDI signal has been input to the TS
The DI detection signal is output to the input setting circuit 40. In the present embodiment, when the header of the SDDI signal is detected from the generated signal, the SDDI input signal detection unit 30 determines that this signal is an appropriate signal.

The input setting circuit 40 receives the D signal from the TS decoder 20
Based on the DVB detection signal and the SDDI signal detection signal input from the VB input signal detection unit 26 and the SDDI input signal detection unit 30, it is determined which format signal is input to the decoding device 1, and the format is determined. A selection signal is output to the switching unit 50 so that the switching unit 50 selects the signal output from the processing circuit in the TS decoder 20 according to the above.

The switching unit 50 converts the signal output from the 10B-8B conversion unit 25 of the TS decoder 20 and the signal output from the data conversion unit 29 based on the switching signal input from the input setting circuit 40. , And outputs it to the demultiplexer 60. Accordingly, the switch 50 always outputs an MPEG stream obtained by demodulating the input signal, regardless of the format of the input signal.

The demultiplexer 60 includes a switch 50
From the input MPEG stream
Separates MPEG video data and MPEG audio data multiplexed into a stream,
G video decoder 70 and MPEG audio decoder 8
Output to 0.

The MPEG video decoder 70 decodes the MPEG video data input from the demultiplexer 60, generates digital video data, and outputs the digital video data from the decoding device 1.

The MPEG audio decoder 80 decodes the MPEG audio data input from the demultiplexer 60, generates digital audio data, and outputs the digital audio data from the decoding device 1.

Next, the operation of the decoding device 1 will be described. First, an operator performs an MPEG2-TS compliant AV
The coaxial cable to which the signal is input is connected to the input terminal 10 of the decoding device 1. This decoding device 1 includes MPEG2
-A DVB signal or an SDDI signal based on TS can be input. If any of the signals is input, the operator need only connect the cable through which the signal is transmitted to the input terminal 10 without having to strictly check which signal the signal is.

The signal transmitted via the coaxial cable connected as described above is input to the TS decoder 20 via the input terminal 10, and the cable equalizer 21 of the TS decoder 20 determines the characteristics of the cable. Compensated. The signals output from the cable equalizer 21 include a DVB demodulation circuit 23 to a DVB input signal detection unit 26 which processes an input signal as a DVB signal, and an SDDI demodulation circuit 27 to an SDDI input signal which processes an input signal as an SDDI signal. Detector 3
0 and are processed in parallel. That is, DV
In a system for processing as a B signal, the DVB demodulation circuit 2
3, the input signal is demodulated as a DVB signal,
The signal is converted into a parallel signal by the BS-P converter 24 and
The -8B converter 25 performs 10-8 conversion.

In a system for processing as an SDDI signal, an SDDI demodulation circuit 27 converts an input signal to an SDDI signal.
The signal is demodulated as a DI signal, converted into a parallel signal by the SDDIS-P converter 28, and descrambled by the data converter 29. Referring to the results of these processes, the DVB input signal detection unit 26 and the SDDI demodulation circuit 27 check whether the signals generated by the 10B-8B conversion unit 25 and the data conversion unit 29 are appropriate MPEG data. Then, a detection signal indicating that fact is output to the input setting circuit 40 from the input signal detection unit that has detected appropriate data.

Based on the input signal detection result detected by the TS decoder 20, the input setting circuit 40 outputs a selection signal to the switch 50 so as to select an appropriate MPEG stream. Is selected. The obtained MPEG stream is separated into a video signal and an audio signal by the demultiplexer 60,
The MPEG video decoder 70 decodes the video signal, and the MPEG audio decoder 80 decodes the audio signal. As a result, digital video data and digital audio data are generated and output from the decoding device 1.

As described above, the decoding apparatus 1 of the present embodiment
In the above, since the DVB signal and the SDDI signal can be input from one input terminal 10, the area of the terminal mounting panel can be reduced, and the device can be downsized. Further, it is possible to prevent a cable connection error which often occurs in a conventional device having different input terminals for each type of signal.

The type of the input signal is determined by the internal DV.
B input signal detector 26 and SDDI input signal detector 3
Since the detection is made at 0 and an effective processing unit is selected, a desired MPEG stream is automatically obtained as a result. Therefore, the operation of setting the type of the input signal is not required, and the MPEG2-
An apparatus for receiving a TS signal can be configured. TS
The decoder 20 has the functions of two decoders for the DVB signal and the SDDI signal.
As shown in FIG. 3, the cable equalizer 21 and the PLL circuit 22 that perform processing independent of the signal format are shared, and each has only one. Therefore, the circuit scale of the TS decoder 20 can be reduced.

The present invention is not limited to the present embodiment, and various modifications are possible.

For example, the configuration of the decoding device 1 is not limited to that shown in FIG. According to the present invention, a plurality of MPEG2-TS signals can be input from one input terminal,
The processing for the input signal can be internally switched according to the input signal. Therefore, for example, the decoding device 1b as shown in FIG. 4 may be used. FIG.
Is substantially the same as the decoding device 1 shown in FIG. 2 except that the DVB decoder 31 and the SDDI decoder 32 are not integrated but are configured as separate processing units. . The configurations of the DVB decoder 31 and the SDDI decoder 32 are shown in FIGS.

In the decoding device 1b shown in FIGS. 4 to 6, the signal input from the input terminal 10 is input to the DVB decoder 31 and the SDDI decoder 32. The signal input to DVB decoder 31, characteristics of the cable is compensated for in the cable equalizer 21 _-1, DVB demodulator 23
Is demodulated as a DVB signal, converted into a parallel signal by the DVBS-P converter 24, and converted to 10-8 by the 10B-8B converter 25. At this time, the PLL circuit 22 _-1
The clock generated in step (1) is used in each component. Also,
The DVB input signal detection unit 26 checks whether the generated signal is appropriate MPEG data or not, and outputs the result to the input setting circuit 40.

Further, signals input to the SDDI decoder 32, the cable equalizer 21 _-2 is characteristic of the cable compensation is demodulated as SDDI signal in SDDI demodulating circuit 27, a parallel in SDDIS-P conversion unit 28 The data is converted into a signal, and the data conversion unit 29 performs a descrambling process. At this time, the clock generated by the PLL circuit _22-2 is used in each component. In the SDDI demodulation circuit 27, it is checked whether the generated signal is appropriate MPEG data, and the result is input to the input setting circuit 4.
Output to 0. The processing after the input setting circuit 40 is the same as the processing of the decoding device 1 according to the above-described embodiment.

Since the decoding device 1b has only one input terminal, the size of the decoding device 1b can be reduced.
In addition, it detects whether or not the signals generated in the DVB decoder 31 and the SDDI decoder 32 are appropriate, thereby detecting substantially the type of the input signal. Therefore, there is no need for the operator to externally set the type of signal, and an appropriate decoder is automatically selected in the input setting circuit 40 and the switch 50 to obtain desired output data. Then, the decoding device 1b having such a configuration,
Since each decoder, that is, the DVB decoder 31 and the SDDI decoder 32 are completely independent and arranged in parallel, a decoder corresponding to a new type of signal can be added or an existing decoder can be deleted. In this case, when the system configuration is changed, it can be easily performed. It is clear that the decoding device 1b having such a configuration is also within the scope of the present invention.

In the present embodiment, the TS decoder 20 is provided with a DVB input signal detecting section 26 and an SDDI input signal detecting section 30 according to a signal format which may be input. . However, if one of the signals cannot be detected, the input signal may be processed as the other signal. Therefore, a configuration having only one of the signal detection units may be employed.

In this embodiment, a case has been described in which the DVB signal and the SDDI signal are to be input. However, the present invention can be applied to arbitrary plural types of signals as long as the signals can be physically input using the same terminal.

Also, in the present embodiment, the present invention has been described by exemplifying a decoding device for receiving, demodulating and decoding the transmitted MPEG2-TS signal. However, the decoding process is not essential. Absent. The present invention is also suitable for application to a stream multiplexer that handles MPEG streams. The stream multiplexer has a multi-channel input and handles signals of a plurality of types of formats. Therefore, if the present invention is applied and each signal is inputted from one terminal and the type of the signal is internally identified and an appropriate process is performed, each cable can be connected without worrying about the signal format. Can be entered.

[0050]

As described above, according to the present invention,
By inputting a plurality of types of MPEG2-TS signals from one terminal, the type is automatically identified and the desired M
A PEG stream can be generated. As a result, MPEG2
In a signal processing device for processing a signal of -TS, the number of signal input terminals can be reduced, and the size of the device can be reduced. In other words, for example, in a device that processes many streams, such as a stream multiplexer, a device that can input more signals can be provided as long as the devices have the same size.

Further, since it is not necessary to set the type of the input signal, the operation becomes easy. Further, it is possible to prevent mishandling and operation mistakes such as erroneous connection and signal type setting mistakes, and a device with better operability can be constructed. Further, since a processing system for a plurality of types of signals can be integrated and a component for performing the same processing can be shared, the size of the apparatus can be further reduced.

Similarly, in a decoding apparatus for generating digital video data and digital audio data from an MPEG2-TS signal, a smaller and more operable apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a data structure of a packet of an MPEG-2 transport stream according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a decoding device according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a TS decoder of the decoding device shown in FIG.

FIG. 4 is a block diagram showing a configuration of a decoding device according to a modification of the embodiment of the present invention shown in FIG. 2;

FIG. 5 is a block diagram showing a configuration of a DVB decoder of the decoding device shown in FIG.

FIG. 6 is a block diagram showing a configuration of an SDDI decoder of the decoding device shown in FIG.

FIG. 7 is a block diagram showing a configuration of a conventional decoding device.

[Explanation of symbols]

1, 1b, 9 ... decoding apparatus, 10 ... input terminal, 20 ... transport stream decoder, 21 _-1, 21 _-2
... Cable equalizer, 22, 22 _-1 , 22 _-2 ... PLL circuit, 23 ... DVB demodulation circuit, 24 ... DVB serial-parallel converter, 25 ... 10B-8B converter, 26 ... DV
B input signal detector, 27 ... SDDI demodulation circuit, 28 ... S
DDI serial-parallel converter, 29 data converter, 30 SDDI input signal detector, 31 DVB decoder, 32 SDDI decoder, 40 input setting circuit, 50
... Switcher, 60 ... Demultiplexer, 70 ... MPE
G video decoder, 80 ... MPEG audio decoder, 3
1,91 ... DVB decoder, 32,92 ... SDDI decoder

Claims (10)

[Claims] (1) MPEG (Moving Picture coding Experts)
An input terminal to which any one of a plurality of predetermined types of audio visual (AV) signals conforming to a transport stream standard of a high-quality moving picture coding system by the Group) is input; A signal identifying means for identifying any one of the plurality of types of signals; performing a predetermined process on the input signal in accordance with the type of the signal as a result of the identification; A signal conversion device for converting the data into encoded AV data. 2. The signal conversion means provided in accordance with the plurality of types of signals, a plurality of individual signal conversion means each converting the corresponding signal into a signal of the predetermined format, And selecting means for enabling the individual signal converting means according to the input signal.
A signal processing device according to claim 1. 3. The individual signal conversion unit according to claim 1, wherein the signal identification unit performs an individual signal conversion process on the input signal based on the conversion process performed by each of the plurality of individual signal conversion units. 3. The signal processing device according to claim 2, wherein the selecting means enables the detected individual signal converting means. 4. An oscillator circuit for generating a clock of a predetermined frequency based on the input signal from the input signal, wherein the plurality of individual signal conversion units perform the conversion based on the generated clock. The signal processing device according to claim 2, wherein: 5. An equalizer for performing equalization processing for compensating characteristics of a transmission path on a signal input from the input terminal, wherein the signal identification unit and the signal conversion unit each include an equalizer. The signal processing device according to claim 1, wherein the identification processing and the predetermined processing are performed on the signal on which the conversion processing is performed. 6. MPEG (Moving Picture coding Experts)
An input terminal to which any one of a plurality of predetermined types of AV signals conforming to the regulations of the transport stream of the Group (high-quality moving picture coding system) is input; Signal identification means for identifying any one of the types of signals; and performing predetermined processing on the input signal in accordance with the type of the signal as a result of the identification, to obtain MPEG encoded AV data of a predetermined format. 1. A decoding device comprising: signal conversion means for converting the data into MPEG data; and MPEG decoding means for decoding the converted MPEG encoded AV data to obtain AV data. 7. The signal conversion means provided in accordance with the plurality of types of signals, a plurality of individual signal conversion means for converting the corresponding signals into signals of the predetermined format, respectively, 7. The decoding apparatus according to claim 6, further comprising: selection means for substantially enabling said individual signal conversion means according to said input signal. 8. The individual signal conversion unit according to claim 1, wherein said signal discriminating unit is configured to perform the individual signal conversion on the input signal based on the conversion process performed by each of the plurality of individual signal conversion units. 8. The decoding device according to claim 7, wherein said decoding means detects said means, and said selecting means enables said detected individual signal converting means. 9. An oscillating circuit for generating a clock of a predetermined frequency based on the input signal from the input signal, wherein the plurality of individual signal conversion units perform the conversion based on the generated clock. The decoding device according to claim 7, wherein: 10. An equalizer for performing an equalization process for compensating a characteristic of a transmission line on a signal input from the input terminal, wherein the signal identification unit and the signal conversion unit each include an equalizer. The decoding device according to claim 6, wherein the identification process and the predetermined process are performed on the signal on which the decryption process has been performed.