JPH01273204A - Digital signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically record the history of the apparatus used for recording on a tape so that the generation management can be realized certainly without burden by recording the apparatus number received through an interface in a user data area together with sound data at the time of dubbing recording. CONSTITUTION:Analog sound signals inputted from a terminal 3 are converted into the digital signals by means of an A/D converter 9 and DAIF signals of AES/EBU standard are inputted from a terminal 4 and subjected to input selection whether the analog input or digital input at a switch 13. At the time of dubbing, the digital input mode is selected. A number peculiar to an apparatus is set at an apparatus ID switch 22 and assigned to a user data register 25 and channel status register 24. Then such history that by which apparatus the inputted data are dubbed and by which apparatus the original data are recorded can be displayed on a display device 30. Thus output of the user data register 25 is correlated with a user ID signal at a user ID generation circuit 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital signal recording and reproducing apparatus such as a video tape recorder and an audio tape recorder capable of recording digital audio.

Conventional technologyIn recent years, videotape recorders capable of digital recording (
(hereinafter referred to as VTR) or audio tape recorder (hereinafter referred to as A)
TR) development is progressing, and various devices are being developed.

The following interface standard aims to unify the interfaces of these various digital devices, to exchange signals as digital signals without degrading the quality, and to make effective use of software.

AES (Audio Engineering 5
Europe
The Digital Audio Interface (hereinafter abbreviated as DAIF) standard, which has been discussed in the Digital Audio Interface (Dcast Union) and is currently being submitted to the IEC and ANSI, is the current worldwide unified standard for professional digital audio. A part of the outline is shown in FIG. 3, FIG. 4, and FIG. 5.

FIG. 3 shows the configuration of subframe units, which are the minimum units of the interface signal format. The first 4 bits are the 4th bit.
The preamble part has three different patterns as shown in the figure “Z”, “Y” and “X”, the next 4 bits are the auxiliary data area, then the audio sample data with 20 bit slots, then the 1 bit valid /y! This is an even parity flag that is valid for the data excluding the preamble section at the end in the user data area, channel status area, and the flag indicating the # effect.

FIG. 4 shows the structure of a frame of a stereo signal consisting of two subframes. Each frame cycles with a period of 192.

FIG. 5 shows the channel status word portion shown in FIG. 3 in a form collected in units of 192 subframes, and the content is allocated in units of 24 bytes as shown in the figure. Pi) 0-3 are not shown in detail in the drawing, but sampling frequency information and various status information are assigned, and byte 6
-9 and pi) 7-bit ASCII data with odd parity is assigned to 10-13, allowing arbitrary character information to be placed, and bytes 14-17 and byte 18
-21 is assigned 32-bit binary data and can carry tape address and time information.

Byte 22 contains a validity flag for each byte block.
The last byte 23 is assigned the CRCC code for the data of pi) 0-22. Regarding how to use this information, there are parts such as the user data area where the user has a large degree of freedom, and there is a lot of room to think of effective ways to use it.

On the other hand, as a problem from the standpoint of those who traditionally use VTRs and ATRs, especially in commercial applications such as broadcasting stations, VTRs
Generation management of recorded tapes, regardless of ATR, i.e., identification of original tapes, edited master tapes, copied tapes that have been dubbed, etc., especially using analog equipment whose quality deteriorates significantly with each generation. It has become important in a world where Conventionally, this tape generation management has been manually entered in the recording space of the tape reel, cassette, or even package.

Problems to be Solved by the Invention However, in the conventional method, generation management of VTR and ATR tapes was dependent on manual labor, which was extremely troublesome, such as errors or omissions in entries, and reels or packages being replaced. There was a problem.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to automatically record the recorded history of a device on a tape to realize generation management accurately and without any burden.

Means for Solving the Problems In order to solve the problems listed in item L, the present invention converts device-specific equipment numbers into digital audio interfaces (DA
means for allocating the device number to the channel status field of the IF) format; means for recording the equipment number received via the interface during dubbing recording in the user data area together with the audio data; and means for recording the playback data from the user data area during playback. It is comprised of means for allocating and transmitting user data fields of the interface format.

According to the above configuration, the present invention can record and reproduce the history from the source side device number to the original recording device number inherited by dubbing on the tape together with the audio signal during dubbing recording, and automatically performs generation management. I can do it.

Embodiments Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a digital recording and reproducing apparatus according to an embodiment of the present invention. In this case, a VTR capable of recording analog video and digital audio will be used as an example.

In the figure, l is an analog video signal input terminal, 2 is an analog video signal output terminal, 3 is an analog audio input terminal,
4 is the DAIF input terminal, 5 is the video signal output terminal, and 6 is the D
AIF output terminal, 7 is a video recording circuit, 8 is a video playback circuit, 9 is an AD converter for audio signals, 1O is a DATF input circuit, 11 is a DA converter for audio signals, 12 is a DAIF output circuit, 13 is an Manual changeover switch, 14 is a video signal recording/playback changeover switch, 15 is a field memory for audio signal processing, 16 is an audio signal recording circuit, 17 is an audio signal recording/playback changeover switch, 1 day video/audio changeover switch , 19 is a recording/reproducing head, 20 is an audio signal reproducing circuit, 21 is a field memory for audio signal processing, 22 is a device ID switch for setting a unique device number, and 23 is a COD (Channel Origin)
24 is a channel status register, 25 is a recording side user data register, 26 is a user ID generation circuit, 27 is a user ID generation circuit, 28 is a playback side user data register, 29 is a changeover switch, 30 is user data This is a display element that displays content.

FIG. 2 is a table showing an example of the assignment contents of user ID signals according to the embodiment of FIG.

Next, the operation will be explained with reference to the drawings.

The analog video signal inputted from the terminal I is processed by the video recording circuit 7 as a recording signal. Since the processing contents are not directly related to the present invention, they will not be described in detail, but in the case of a component recording type VTR, processing includes decoding processing from an NTSC signal, time division compression processing, FM modulation, etc. The generated recording signal is selected by the recording/reproduction changeover switch 14,
Furthermore, the recording/reproducing head 19 is driven via the video/audio changeover switch 18. The reproduced video signal is sent to switch 18.
and 14 in the reverse direction, and is led to the video reproduction circuit 8. The video reproducing circuit 8 performs waveform shaping processing, demodulation processing, and T
The signal is subjected to time axis correction and expansion using BC, and finally encoded into an NTSC signal, which is output from terminal 2.

The configuration shown in Figure 1 takes as an example the case where a single recording/playback head is used to record analog video and digital audio compressed in field units by area division. The configuration is not directly related to the present invention and is merely an example for explanation.

The analog audio signal is input manually from terminal 3 and sent to AD converter 9.
is converted into a digital signal. When the AES/EBU standard DAIF signal is input from the terminal 4, the DAIF input circuit 10 detects subframe synchronization as shown in FIGS. 3 and 4, and demodulates the data portion subjected to biphase modulation. bit synchronization. The human input digital audio signal separated by the DAIF input circuit 10 is input to the switch 13. The switch 13 selects either analog input or digital manual input depending on the manual selection mode. Normally, when inputting as an original source from a microphone or mixer, analog manual power is used, and when dubbing, digital manual power mode is selected.

The selected digital audio signal is once written into the field memory 15 in units of fields.

On the other hand, the device ID switch 22 is a switch that can set a device unique number. For example, as shown in the example in FIG.
You can set an alphanumeric code such as . This can correspond to the alphanumeric channel origin data (COD) in bytes 6-9 of the channel status data shown in FIG. The COD register 23 scans the output of the device rD switch 22 and records the serial output to the user data register 25 and channel status register 24.
give it to Although not shown in the figure, the channel status register 24 also reads channel status information such as address and time code information, and outputs serial output. The user data register 25 can also reorganize the user data in order to record the device ID number and manually entered user data together on the tape, and display the result on the display element 30.

In other words, as will be described later, it is possible to display the history of what kind of equipment was used to dub the human-generated source, and what equipment was used to record the original. The output of the user data register 25 is input to the user ID generation circuit 26, and is correlated with the user ID signal recorded on the tape.

An example is shown in FIG.

The user ID signal is transmitted at the sampling frequency (
The surplus generated between the number of audio samples in one field period) and the number of data blocks is used. IDO to ID
If there is a user ID area up to n, the device numbers on the source side that are input to TDO as shown in the table are 1 in order.
The previous generation, two generations ago, etc. are stacked with the original.

The original TDn is fixed, and the others are updated by repeating dubbing. In reality, the practical number of dubbing is said to be about 5, and that is sufficient for the stack depth.

The generated user ID signal is written into the field memory 15 via the data bus, and thereafter, the audio signal recording circuit 16 performs addition of an error correction signal, interleaving, and modulation in the same manner as audio data.

The generated recording signal drives the recording/reproducing head 19 via switches 17 and 18.

The reproduction operation of the audio signal passes through the switches 18 and 17 in reverse, and is temporarily written into the field memory 21 through waveform processing, demodulation, and time-closed axis correction by the TBC in the audio signal reproduction circuit 20. Thereafter, the data read from the memory undergoes error correction processing in the audio signal reproduction circuit 2o, and is written into the field memory 21 again. The data after the correction process is read out again from the field memory 21, converted into an analog signal by the DA converter 11, and outputted from the terminal 5. After the error correction is completed, the user ID signal recorded together with the audio data is read out from the field memory 21, and only the user ID portion is extracted by the user ID separation circuit 27 and passed to the user data register 28. The user data register 28 can send only selected necessary information among the information in the user data area to the display element 3o for display.

In addition, the reproduced user data is mixed with channel status information via a switch 29, mixed with audio data in the DAIF output circuit 12, added with a preamble and a valid flag, and calculated parity, and then modulated to a terminal. It is output from 6.

If the VTR devices configured as described above are each assigned a unique device number and operated in a network system, even if editing/dubbing operations are repeated, the recorded device history will be automatically recorded on the tape. It can be recorded, and generation management can be achieved accurately and with less burden.

As described in detail, according to the present invention, a VTR and an ATH
Generation management of tapes can be realized accurately and unconsciously, and the effect is particularly great for VTRs where the video that requires generation management remains analog.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a digital signal recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is an explanation of the contents of the user-10 signal according to the embodiment shown in FIG. 1.
FIG. 4 is a diagram showing the structure of a subframe in the DArFAr-MAT of the BU standard, FIG. 4 is a diagram showing the frame construction of the format shown in FIG. 3, and FIG. 5 is a diagram showing the format construction of channel status data in the format shown in FIG. 10...DAIF input circuit, 12...DAIF
Output circuit, 16...Audio signal recording circuit, 20...
・Audio signal reproduction circuit, 22...equipment ID switch,
23... COD register, 24... Channel status register, 25... User data register, 26... User ID generation circuit, 27...
User ID separation circuit, 28...user data register. Name of agent: Patent attorney Toshio Nakao (Figure 2, Ward C')
Mound

Claims (1)

[Claims] An audio tape recorder device and a video tape recorder device capable of recording digital audio, comprising an AES/EBU digital audio interface, means for assigning a unique equipment number assigned to the device to a channel status field of the digital audio interface format. a means for recording a device number received via the interface during dubbing recording in a user data area together with audio data; and a means for assigning and transmitting playback data from the user data area to a user data field of the interface format during playback. What is claimed is: 1. A digital signal recording and reproducing device characterized by having a means for performing generation management of recording tapes.