JP2000311438A - Digital signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a video and an audio from being disturbed at the time of changing them even when they are changed in format while receiving a data to be externally inputted. SOLUTION: This recording and reproducing device comprises a comparison part 6 which sequentially compares information representing data formats contained in received data with formats set by decoding parts (10, 11, 12) for decoding the received data, and controls to set the formats in the above- mentioned decoding parts into the data formats contained in the received data, and a video and audio data control part 7 for holding or muting the data to be decoded by the decoding part as the result of the comparison by this comparison part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal recording / reproducing apparatus for recording / reproducing a digitized video signal and audio signal on a recording medium, and more particularly to recording a plurality of modes of data inputted from external equipment. The present invention can be suitably used for a digital signal recording / reproducing apparatus for recording / reproducing on a medium.

[0002]

2. Description of the Related Art As a conventional technique, an I-type as shown in FIG.
Some have a digital interface circuit conforming to the DV format of the EEE1394 standard.

Hereinafter, a conventional circuit will be described with reference to FIG.

In FIG. 3, a reproduction processing unit 1 on the transmission side includes
Playback processing conforming to the DV format standard is performed by a DVC (Digital Video Cassette), PC (Personal Computer), or the like, and playback data composed of a video signal, an audio signal, and auxiliary data (subcode and AUX data) is converted into an IEEE 1394 standard. And supplies it to the 1394 LSI (S) 3.

A 1394 microcomputer (S) 2 on the transmitting side
Is supplied with control data including information such as a reproduction data format during reproduction from a control microcomputer in the reproduction processing unit 1 and conforms to the IEEE 1394 standard such as a packet header and a CIP header adapted to the reproduction data by the control data. 1394 LSI
(S) 3

[0006] The 1394 LSI (S) 3 on the transmission side stores the reproduction data supplied from the reproduction processing unit 1 and the 1394 LSI (S).
The additional signal supplied from the microcomputer (S) 2 is mixed, converted into an IEEE 1394 isochronous communication format, output, and transmitted to another device via an IEEE 1394 dedicated cable.

On the other hand, on the receiving side that receives real-time data transmitted via an IEEE1394 dedicated cable, the receiving side 1394 LSI (R) 4 converts the received data in the isochronous communication format into an additional signal such as a packet header and a CIP header. The data is classified into reproduction data composed of a video signal, an audio signal, and auxiliary data.

Then, the separated additional signal is supplied to the receiving side 1394 microcomputer (R) 5,
The microcomputer (R) 5 detects the transmitted data format and the like and supplies a control signal to the receiving side control microcomputer 21.

The control microcomputer 21 sends a signal to the video decompression / audio processing unit 9 based on the supplied control signal.
It is set so as to output a signal conforming to the format of the transmitted reproduction data, and the 1394 I / F processing section 20, the correction code adding section 10, and the modulation processing section 11 are provided with a recording medium 1
The mode is set for recording in No. 3.

On the other hand, reproduced data composed of a video signal, an audio signal and auxiliary data is reconverted into DV format IEEE 1394 data by the 1394 LSI (R) 4 and supplied to the 1394 I / F processing unit 20.

The 1394 I / F processing unit 20 converts the data into a DV format and classifies the data into a video signal, an audio signal, and auxiliary data.

Auxiliary data of the classified data is supplied to the control microcomputer 21 and the correction code adding unit 10, and the video signal and the audio signal are supplied to the video decompression / audio processing unit 9. At the same time, it is also supplied to the correction code adding unit 10.

The video signal and the audio signal supplied to the video decompression / audio processing unit 9 are output to an external output processing system such as a display device or an audio device, and supplied to a correction code adding unit 10. The video signal and the audio signal are mixed again with the auxiliary data, subjected to a correction code adding process for error correction at the time of reproduction, and then supplied to the modulation processing unit 11.
The recording medium 13 passes through the HEAD-AMP unit 12 following this.
Will be recorded.

[0014]

In the above conventional circuit, in the initial state of receiving the reproduction data transmitted from the transmission side, the data format detection by the 1394 microcomputer (R) 5 and the mode by the control microcomputer 21 are performed. After the setting, the output to the external display device and the audio device and the recording to the magnetic recording medium 13 may be started.

However, during reception, that is, during external output to a display device or an audio device or during recording on the magnetic recording medium 13, the data format of the reproduction data transmitted from the transmission side (TV broadcasting system (NTSC / PA
L), data compression rate, and audio mode)
Because the playback data is transmitted in real time,
In the software processing by the 1394 microcomputer (R) 5 and the control microcomputer 21, the processing for the change of the reproduction data cannot catch up with the time.

For this reason, until the detection by the microcomputer and the mode setting in accordance with the data format are completed, the external output to the display device and the audio device outputs color noise for video and audio noise for audio, and Similarly, color noise for video and audio noise for audio are also recorded on the recording medium 13 as they are, resulting in a system with significantly reduced quality.

The present invention has been made in view of the above problems, and has as its object to provide a digital signal recording / reproducing apparatus which solves the problem.

[0018]

Means for Solving the Problems To solve the above problems, the present invention has the following configuration.

That is, at least video data compressed and encoded in a predetermined format, audio data, and auxiliary data including information indicating the data format of the video data and the audio data are received. A digital signal recording / reproducing apparatus for decoding audio data and recording / reproducing the data on a recording medium, comprising: a reception processing unit which receives the video data, the audio data, and the auxiliary data, and separates these data; And a data format adapted to the audio data, and a decoding unit for decoding the data, a recording medium for recording and reproducing the decoded video data and audio data, and controlling the setting of the data format in the decoding unit. And a data format set by the control unit and video data included in the received auxiliary data. A comparison unit that sequentially compares information indicating a data format of audio data, and controls the control unit to set a data format in the control unit to a data format included in the received auxiliary data. A video / audio data control unit for holding the video data to be decoded by the decoding unit and / or muting the audio data based on the result of comparison by the comparison unit.

Here, it is preferable that the comparing section is constituted by individual hardware.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a block diagram of a digital recording / reproducing apparatus according to the present invention. The same reference numerals are given to the same components as in the prior art.

The configuration in the block diagram and the respective block functions will be described. The reproduction processing unit 1 performs a reproduction process in accordance with the DV format standard on a DVC or a PC on the transmission side, and processes a processed video signal / video. The reproduced data composed of the audio signal and the auxiliary data is
Processing is performed on the 394 data.

The 1394 microcomputer (S) 2 is supplied with a control signal in accordance with the data format being reproduced from the control microcomputer included in the reproducing apparatus 1, and
It generates and outputs additional signals such as a packet header and a CIP header corresponding to the reproduction data format conforming to the EEE1394 standard.

Further, the 1394 LSI (S) 3
94 The additional signal supplied from the microcomputer 2 and the reproduction device 1
The playback data of the DV format is converted to IEEE1394.
Signals processed into data for use are supplied, these signals are mixed, converted into IEEE 1394 isochronous communication data, and output.

On the other hand, on the receiving side, the transmitting side 1394
The data transmitted from the LSI (S) 3 via the IEEE1394 dedicated cable is transmitted to the receiving side 1394 LSI (R).
4 and the 1394 LSI (R) 4 receives the IEEE
E1394 isochronous communication data is separated into additional signals such as a packet header and a CIP header and reproduced data,
The additional signal is supplied to the 1394 microcomputer (R) 5, and the reproduction data is converted from the isochronous communication data into the IEEE 1394 data in the DV format, and then the screen hold / audio mute processing + 1394I /
It is supplied to the F processing unit 7.

In the AUX comparison section 6, 1394LS
IEEE of DV format supplied from I (R) 4
The AUX data in the auxiliary data is extracted from the 1394 data, and the broadcast system, data compression ratio,
The audio mode data and the format of the received data are predicted and set by the control microcomputer 8 in advance, and setting signals such as a broadcast system, a data compression rate, and an audio mode corresponding to the format are supplied.

The AUX comparator 6 compares the mode setting signal supplied from the control microcomputer 8 with the 1394 LSI (R).
IEEE 1394 in DV format supplied from the Internet
The corresponding data in the AUX data included in the application data is compared in real time, and the comparison result flag is set to the control microcomputer 8 and the screen hold / audio mute / 139.
It is supplied to the 4 I / F processing unit 7.

Screen hold and audio mute + 1394I
The / F processing unit 7 converts the DV format IEEE 1394 data supplied from the 1394 LSI (R) 4 into the DV format again, classifies the data into a video signal, an audio signal, and auxiliary data. Is supplied to the video decompression / audio processing unit 9 and
The video and audio signals processed by the audio processing unit 9 are output to the display device / sound device.

On the other hand, a signal obtained by adding auxiliary data to the video signal and the audio signal is supplied to the correction code adding section 10,
The correction code adding unit 10 adds a correction code to be used in the reproduction process and supplies the result to the modulation unit 11.

Also, screen hold / voice mute + 13
The 94 I / F processing unit 7 supplies auxiliary data (AUX data) to the control microcomputer 8, and the control microcomputer 8 performs various processes such as date display with reference to the AUX data.

In the modulation processing section 11, the correction code adding section 10
And modulates the DV format data to which the correction code is added, and supplies the data to the HEAD-AMP 12.
-The modulated data is recorded on the magnetic recording medium 13 via the AMP 12.

Here, while the reproduction data transmitted from the transmission side is being received, the AUX comparing section 6 transmits the data of the broadcasting system, the data compression rate, the audio mode, and the like in the AUX data included in the received data transmitted. A comparison is made with the mode control setting signal corresponding to the received data predicted from the control microcomputer 8 corresponding to the predicted data.
The UX comparison unit 6 sends a flag indicating normal reception to the control microcomputer 8 and screen hold / audio mute +139
The signal is output to the 4 I / F processing unit 7, and the subsequent operation is the same as that of the conventional circuit.

Next, an operation when the data format of the reproduction data on the transmission side changes while receiving the reproduction data transmitted from the transmission side will be described.

First, when the data format of the reproduction data on the transmission side changes and the broadcasting system or the data compression ratio differs, the AUX comparing section 6 causes the AUX comparison section 6 to change the data format.
It detects that the data of the broadcasting system and the data compression rate in the AUX data supplied from the LSI (R) 4 is different from those mode setting control signals supplied from the control microcomputer 8, and sets the mismatch flag to the control microcomputer 8. And a screen hold / audio mute + 1394 I / F processing unit 7.

In the screen hold / audio mute + 1394 I / F processing circuit 7 to which the mismatch flag is supplied from the AUX comparing unit 6, the video hold signal is processed on the hardware, and the sound signal is processed in the hardware according to the mismatch flag. By performing the rewriting process on the mute signal, in the external output to the display device and the audio device, and in the data recorded on the magnetic recording medium 13, the generation of color noise in video and the generation of noise in audio can be prevented in real time.

In the control microcomputer 8, AU
In accordance with the mismatch flag supplied from the X comparison unit 6, the recording stop on the magnetic recording medium 13 and the external output stop processing of the video / audio output are immediately performed by software.

At the same time, the control microcomputer 8 simultaneously supplies a control signal according to the format of the changed transmission data supplied from the receiving 1394 microcomputer 5 and a screen hold / audio mute processing + 1394 I / F processing section 7. The mode setting signal is changed to a mode setting signal according to the changed data format with reference to the real-time AUX data being transmitted from the transmitting side and supplied to each signal processing unit on the receiving side shown in FIG. Then, each signal processing unit shifts to processing according to the mode setting signal.

In the AUX comparing section 6, the data format based on the changed mode setting signal and the 1394 LSI
(R) The data format in the AUX data supplied from 4 is compared in real time, and if they match, the mismatch flag is released, and the flag indicating normal reception is set to the control microcomputer 8, and the screen hold / audio. Mute +1
It is supplied to the 394 I / F processing unit 7.

Screen hold and audio mute + 1394I
The / F processing unit 7 cancels the screen hold and rewrite processing to the audio mute signal by the flag indicating the normal reception, and resumes the normal reception operation by the processing according to the changed mode setting signal.

The control microcomputer 8 having received the flag indicating normal reception confirms that the entire signal processing unit has returned to normal operation by the flag, and externally outputs the received data to the display device / audio device. Then, the recording processing operation on the magnetic recording medium is restarted by software.

Next, a case where only the audio mode is different in the reproduction data format on the transmission side will be described.
A mismatch flag indicating that the audio mode data in the AUX data supplied from the SI (R) 4 is different from the audio mode setting control signal supplied from the control microcomputer 8, indicating that only the audio mode is different. Microcomputer 8 and screen hold / audio mute +1394 I / F
It is supplied to the processing unit 7.

The screen hold / audio mute + 1394 I / F processing unit 7 supplied with the mismatch flag from the AUX comparison unit 6 rewrites the audio signal into a mute signal only on hardware according to the mismatch flag, and External output to device and magnetic recording medium 13
In the recorded data to the, the generation of noise sound in voice is prevented in real time.

In the control microcomputer 8 which receives the flag indicating that only the audio mode is mismatched, no color noise is generated in the video system in this case, and since the audio signal is also rewritten to the mute signal, the audio noise is also reduced. Since this does not occur, the reception data is not output to the display device and the audio device, and the recording operation on the magnetic recording medium is not stopped, and the reception data supplied in real time from the screen hold / audio mute + 1394 I / F processing unit 7 is not performed. AU in
With reference to the X data, the mode setting signal of the audio mode is changed and supplied to each signal processing unit shown in FIG. 1, and each signal processing unit shifts to processing according to the mode setting signal.

In the AUX comparing section 6, the data format based on the changed mode setting signal and the 1394 LSI
(R) Compares the audio mode data in the AUX data supplied from 4 in real time, and if they match, cancels the mismatch flag, and sets the flag indicating normal reception to the control microcomputer 8 and the screen hold Audio mute +13
The signal is supplied to the 94 I / F processing circuit 7.

Screen hold and audio mute + 1394I
The / F processing unit 7 cancels the rewriting process to the audio mute signal by the flag indicating the normal reception, performs the normal reception operation by the process according to the changed mode setting signal, and performs the normal voice operation according to the audio mode. The signal is externally output to the audio device and recorded on the magnetic recording medium 13.

FIG. 2 is a flowchart showing the circuit operation processing of the present invention described above.

[0048]

As described above, in the digital signal recording / reproducing apparatus according to the present invention, the IEEE1394 is used.
When data transmitted through a digital interface conforming to the DV format of the isochronous communication of the standard is received, and when the received data is externally output and recorded on a magnetic recording medium, the format of the transmitted reproduction data on the transmission side is changed. Even if it changes during the receiving operation, it is possible to achieve the transition to the external output and recording to the magnetic recording medium and the data format after the change, without generating screen failure and audio noise in the transition period at the time of format change,
A high-quality system can be realized.

Further, since the detection means for detecting data of a format different from the preset format is constituted by independent hardware, it is possible to perform processing in real time without being affected by other processing. It is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a digital signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a flowchart showing a processing procedure when a transmission-side reproduced data format changes during a receiving operation of the digital signal recording / reproducing apparatus according to the present invention.

FIG. 3 is a block diagram showing a circuit configuration of a conventional digital signal recording / reproducing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Playback processing apparatus by DVC and PC, 2 ... Transmission side IEEE1394 microcomputer, 3 ... Transmission side IE
EE1394 LSI, 4 ... IEEE 1394 on the receiving side
LSI, microcomputer for receiving side IEEE 1394,
6 AUX (auxiliary data) data comparison circuit, 7
-Screen hold-Audio mute + 1394 I / F processing circuit, 8: Reception side system control microcomputer, 9-Image expansion for external output-Audio processing circuit, 10-Correction code addition circuit, 11-Modulation Processing circuit, 12 ... HEA
D-AMP, 13 ... magnetic recording medium, 20 ... 13
94 I / F processing circuit, 21: receiving side control microcomputer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C053 FA22 GB15 GB21 JA01 JA21 KA17 KA24 KA26 KA30 5D044 AB05 AB07 DE02 DE04 DE17 DE42 EF05 FG18 GK12 HL11 JJ05

Claims (2)

[Claims] At least video data compressed and encoded in a predetermined format, audio data, and auxiliary data including information indicating a data format of the video data and the audio data are received. In a digital signal recording and reproducing device for decoding and recording audio data on a recording medium, receiving the video data, audio data and auxiliary data,
A reception processing unit for separating these data; a decoding unit for setting a data format suitable for the received video data and audio data; and decoding these data; and recording the decoded video data and audio data. A recording medium to be reproduced; a control unit that controls setting of a data format in the decoding unit; and a data format set by the control unit and a data format of video data and audio data included in the received auxiliary data. And a comparison unit for controlling the control unit so as to sequentially compare information with the data format and to set a data format in the control unit to a data format included in the received auxiliary data, and a comparison result in the comparison unit. The video / audio data to be held by the decoding unit and / or the audio / video data to be muted. Digital signal recording and reproducing apparatus characterized by comprising a motor control unit. 2. The digital signal recording / reproducing apparatus according to claim 1, wherein said comparing section is constituted by individual hardware.