JPH04168681A - Digital audio tape recorder - Google Patents

Abstract

PURPOSE:To rewrite a data in an arbitrary recording region and to perform a postrecording operation freely by a method wherein only a data in a selected channel out of read-out data is replaced with an input data and composed and the composed data are given to a corresponding write head at a point of time when it has approached a recording region for a read-out data. CONSTITUTION:A signal which has been traced by using magnetic heads R1, R2 for readout use and which has been read out in parallel is separated into signals for individual channels at a signal separation circuit 5. When a rewritten sound signal or picture signal is input from input terminals 13, 14, a signal, in a channel, whose rewrite has been designated out of signals in the individual channels separated by using the signal separation circuit 5 is replaced with a new signal to be input and a composite signal is produced at a signal composition circuit 1; a composed data is given to corresponding write heads W1, W2 at a point of time when the heads have approached a recording region for a read-out data. Thereby, a data can be rewritten in an arbitrary recording region on a magnetic tape 2 and a postrecording operation can be performed freely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a digital audio system that can record and reproduce multiple series of data such as image data and audio data in parallel, and that can also record additional data later by rewriting some of the data. Tape recorder (D 1g1tal Auclio
Tape recorder (hereinafter also abbreviated as DAT).

Conventional technology For example, a recording/playback device records two types of data, image data and audio data, in parallel on a recording medium, and when playing back, can play back the sound related to the image in parallel with the playback of the image. is conventionally known.

Conventional general recording/playback devices with such functions have a rewrite function that rewrites one of the recorded image data and audio data with new data, or a rewrite function that rewrites one of the recorded image data and audio data, and It does not have a so-called dubbing function that allows you to record additional audio data after recording.

As an alternative to this, a recording area for image data and a recording area for audio data are alternately and distinctly determined on the magnetic tape in advance, making it possible to rewrite data or perform dubbing only within the determined areas. A recording/reproducing device (Japanese Unexamined Patent Publication No. 2-149991) has also been developed.

Problems to be Solved by the Invention However, with conventional general recording and reproducing devices that do not have a rewrite function or an after-recording function, even if data is to be rewritten or additionally recorded, all data must be re-recorded. First, there is a problem that the operation is troublesome.

In addition, in the case of a recording/reproducing device that distinguishes and defines recording areas on a magnetic tape in advance for each data system,
Since the recording area for each system of data is divided on the tape, it is possible to rewrite image data or perform dubbing from one recording area to the next, or to move the recording area to an arbitrary position. There is a problem in that it cannot be moved to perform rewriting or dubbing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a digital audio tape recorder that can record and reproduce multiple series of data in parallel, and can freely rewrite data and perform dubbing in any recording area on a magnetic tape. That's true.

Means for Solving the Problems The present invention is a rotary head type digital device that records data by tracing tracks on a magnetic tape or reproduces data from a magnetic tape using a head attached to a rotating drum. In an audio tape recorder, a track on a magnetic tape is traced at a first azimuth angle, and a recording area in which one series of data is sequentially arranged and recorded in the form of a digital signal is regarded as one channel, and multiple channels are recorded as one channel. - a first write head forming in parallel on the rack and recording input data corresponding to each channel; tracing the same track preceding the write head at the same azimuth angle as the write head; a first reading head that reads the recorded data of each channel; and a second azimuth angle that traces the track on the magnetic tape, forming the plurality of channels in parallel on the magnetic tape and recording data for each channel. a second write head for recording corresponding input data; and a second read head that traces the same track preceding the write head at the same azimuth angle as the write head and reads the recorded data for each channel. inputting arbitrary data to be recorded in place of the read data of the selected channel among the read data read from each channel by each read head, and inputting the input data and the read data of the channel that will not be rewritten. and a data replacement means for synthesizing the synthesized new data to the writing head corresponding to each reading head when the writing head approaches the recording area of the read data. This is a digital audio tape recorder with special features.

According to the present invention, when the data to be rewritten in the selected channel is input, only the data of the selected channel is read out of the data read from each channel of the magnetic tape by the reading head at that time. The data replaced and synthesized with the input data is applied to the corresponding write head by the data replacement means at the point when the head approaches the recording area of the read data, and as a result, only the data of the selected channel is transmitted. It will be rewritten with new data.

After-recording is possible by selecting an initially unrecorded channel and rewriting the data using the same procedure.

Embodiment FIG. 1 shows a rotating head type DAT which is an embodiment of the present invention.
FIG. 2 is a block diagram showing the basic configuration of the computer.

Four magnetic heads R1, Wl, R2, W2 are provided on the outer periphery of a cylindrical rotating drum 1 at a circumferential angle of 90°, and are spaced apart from each other by a circumferential angle of 90°. The magnetic tape 2 is pressed over the area.

Furthermore, different azimuth angles are set for each of the magnetic heads in order to prevent noise due to crosstalk between adjacent tracks on the magnetic tape 2. That is, here, +α is applied to the first write magnetic head R1 and the first read magnetic head W1, and +α is applied to the second read magnetic head R2 and the second write magnetic head W2. The azimuth angle of α is set respectively.

FIG. 2 shows the relationship between the arrangement of the tape 2 and the rotating drum 1. The rotating drum 1 is provided with its rotating shaft 1a tilted at a certain angle with respect to the vertical direction, and the magnetic tape 2 is The direction is set to horizontal. Therefore, each magnetic head of the rotating drum 1 moves the magnetic tape 2 in a direction inclined by a certain angle with respect to the running direction of the magnetic tape 2.
scan across.

Furthermore, here, a track that is one track behind the track scanned by the first magnetic head R1 for reading, that is, a track scanned by the first magnetic head R1 for reading one time before, is scanned by the first magnetic head R1 for writing. The second write magnetic head scans a track that is one track behind the track that W1 scans and that is scanned by the second read magnetic head R2, that is, the track that was previously scanned by the second read magnetic head R2. Each reading magnetic head R1°R2 scans at W2.
and each corresponding write magnetic head Wl.

The positions of the positions W2 and W2 are slightly shifted in a direction parallel to the rotation axis 1a of the rotary drum 1.

The recording/reproducing amplifier 3 amplifies the digital data read from the magnetic tape 2 by the reading head R1°R2 and supplies it to the reproduction signal processing circuit 4, and also amplifies the digital data sent from the recording signal processing circuit 15. This is a circuit for applying the same to the write magnetic heads Wl and W2.

The reproduced signal processing circuit 4 is a circuit for performing de-interleaving processing and error correction processing on the reproduced digital data sent from the recording/reproducing amplifier 3.

Connected to the next stage of the reproduced signal processing circuit 4 is a signal separation circuit 5 having a function of separating the signals processed by this circuit into individual channels. Here, a channel is a storage area for one series of data provided on a track of the magnetic tape 2, and here, four channels are formed in parallel on the track.

FIG. 3 is a diagram schematically showing the arrangement of channels formed on tracks A and B of the magnetic tape 2. As shown in FIG. That is, the data of each channel is sequentially arranged bit by bit according to the order given to each channel. In other words,
Data for each channel is recorded in parallel, and playback is also performed in parallel.

However, in reality, the data of each channel is interleaved and recorded, so it is not simply arranged sequentially as shown.

Note that among tracks A and H in FIG. 3, track A is connected to the first reading magnetic head R whose azimuth angle is α.
1 and the first write magnetic head W1 trace, and track B is a track traced by the second read magnetic head R2 and the second write magnetic head W2 whose azimuth angle is -α. It is. Tracks A, B
The upper and lower ends of are subcode areas a and b for recording auto-tracking signals and identification codes for search.
Further, the intermediate portion is provided as a main recording area in which original data is recorded.

Returning to FIG. 1, the signal separation circuit 5 described above is connected to an audio digital-to-analog conversion circuit (hereinafter abbreviated as a D/A conversion circuit) 6 and a video D/A conversion circuit 7. ing. The audio D/A conversion circuit 6 separates the third and fourth channels Ch3. This circuit converts the Ch4 audio signal from a digital signal to an analog signal, and the converted audio signal is output from the output terminal 8.

The video D/A conversion circuit 7 is a circuit that converts the video signals of the first and second channels Chi and Ch2 separated by the signal separation circuit 5 from digital signals to analog signals, and the converted video signals are The signal synthesis circuit 10 outputs from the output terminal 9 the signals of some channels among the signals separated by channel by the signal separation circuit 5.
This circuit replaces the signal sent from the audio A/D conversion circuit 11 or video A/D conversion circuit 12 connected to this circuit and synthesizes it into a new signal. The audio A/D conversion circuit 11 is a circuit that converts an analog audio signal input from the input terminal 13 into a digital signal, and the video A/D conversion circuit 12 converts an analog video signal input from the input terminal 14. This is a circuit that converts the signal into a digital signal.

The recording signal processing circuit 15 is a circuit that performs processing such as interleaving and addition of an error correction code to the signal synthesized by the signal synthesis circuit 10, and supplies the signal to the recording/reproducing amplifier.

The control circuit 16 includes the recording/reproduction amplifier 3, the reproduction signal processing circuit 4, the signal separation port M@5, and the signal synthesis circuit 10.
, recording signal processing circuit 15, etc., which have a function of controlling the entire apparatus.

FIG. 4 is a flowchart showing the recording and reproducing operation of the DAT.

FIG. 5 is a diagram schematically showing the contents of recorded data on the magnetic tape 2 before rewriting, and FIG. 6 is a diagram schematically showing the contents of recorded data on the magnetic tape 2 after rewriting by the DAT. .

Next, the recording and reproducing operation of the DAT will be explained with reference to FIGS. 4 to 6.

The track of magnetic tape 2 has its first channel Chl.
It is assumed that image data has been recorded on the second channel Ch2, and audio signals have been recorded on the third channel Ch3 and fourth channel Ch4, as shown in FIG.

At the start of step S1, the rotary drum 1 rotates in the direction of arrow ω shown in FIGS. 1 and 2, and the magnetic tape 2 runs in the direction of arrow P, so that each magnetic head R1
, Wl, R2, and W2 sequentially trace corresponding tracks A and B on the magnetic tape 2, respectively.

Track A traced by write magnetic heads Wl and W2
, B are previously traced by the corresponding reading magnetic heads R1 and R2 in steps S2 and S3, and recording signals for four channels of the track are sequentially read in parallel.

The read signal is processed in step S4. It is reproduced in S5. That is, first, the recording/reproducing amplifier 3 amplifies the signal, the reproduced signal processing circuit 4 performs processing such as dinning and error correction, and then the signal separating circuit 5 separates the signals for each channel, that is, the first . Video signals of second channels Chi and Ch2,
Third. Fourth channel Ch3. The separated audio signal is converted into an analog signal by the audio D/A conversion circuit 6 and sent to the output terminal 8, and the separated video signal is sent to the video D/A conversion circuit 7. The signals are converted into analog signals and outputted from the output terminals 9, respectively.

In parallel to this, step S6. When the audio signal or video signal to be rewritten is input from the input terminal 13.14 in S7, the analog signal is converted into a digital signal by the audio A/D conversion circuit 11 and the video A/D conversion circuit 12. The signal is input to the signal synthesis circuit 10.

In the signal synthesis circuit 10, in step s8, among the signals of each channel separated by the signal separation circuit 5, the signal of the channel corresponding to the channel designated to be rewritten, that is, the signal input from the input terminal 13.14, is Processing is performed to generate a composite signal by replacing it with a new input signal. For example, when the reading magnetic heads R1 and R2 search for the head position ■ of the signal of image 2 of the first and second channels ch1 and ch2 shown in FIG. When a video signal of a new image 2- is input from the input terminal 14, the signal synthesis circuit 1
0, the third and fourth channels Ch3. A composite signal is generated in which the audio signal of Ch4 remains unchanged and the video signal of image 2 is replaced with the video signal of input image 2-.

The signals synthesized in this way are processed by the recording signal processing circuit 11.
After processing such as interleaving and addition of an error correction code is performed in step S9. Track A of magnetic tape 2 in SIO
, B.

As mentioned earlier, the positions of the write magnetic heads Wl and W2 are set so that they trace the tracks A and B traced by the corresponding read magnetic heads R1 and R2 with a delay of one track. Therefore, the new combined signal is recorded in the recording area where the uncombined signal read by the reading magnetic heads R1 and R2 was recorded. That is, the image signal of the previously recorded image 2 is rewritten to the image signal of the new image 2-, as shown in FIG.

In the next step Sll, it is determined whether or not to continue the operation, and if the same operation is to be continued thereafter, step S2
The process returns to , and the same process is repeated.

If it is determined in step Sll that all processing has been completed, the process moves to step S12 and the operation is stopped.

Note that when the above operation is performed on an unrecorded magnetic tape 2 and both an audio signal and a video signal are provided as input data, it is possible to record the audio signal and the video signal in parallel. Furthermore, for example, when an audio signal is supplied as input data to the magnetic tape 2 on which only video signals have been recorded, the audio signal can be dubbing.

Effects of the Invention As described above, according to the digital audio tape recorder of the present invention, when the data to be rewritten in the selected channel is input, the reading head reads the data read from each channel of the magnetic tape. Among them, only the data of the selected channel is replaced with the input data and the synthesized data is given to the corresponding write head by the data replacement means at the time when the head approaches the recording area of the read data. Therefore, only the data of the selected channel can be rewritten with new data, and data rewriting and dubbing can be performed freely in any recording area on the magnetic tape.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing the basic configuration of a digital audio tape recorder which is an embodiment of the present invention, and Fig. 2 shows the arrangement of a rotating drum and magnetic tape in the digital audio tape recorder. A diagram showing the arrangement relationship, FIG. 3 is a diagram schematically showing the recording format on the magnetic tape,
Figure 4 is a flowchart showing the operation of the digital audio tape recorder, Figure 5 is a diagram schematically showing the recorded content of the magnetic tape before rewriting, and Figure 6 is a diagram schematically showing the recorded content of the magnetic tape after rewriting. FIG. DESCRIPTION OF SYMBOLS 1... Rotating drum, 2... Magnetic tape, 3... Recording/reproducing amplifier, 4... Playback signal processing circuit, 5... Signal separation circuit, 10... Signal synthesis circuit, 11...・A/D conversion circuit for audio, 12... A/D conversion circuit for video,
13° 14... Input terminal, 15... Recording signal processing circuit, 16... Control circuit, R1... First magnetic head for reading, Wl... First magnetic head for writing.
R2...Second magnetic head for reading, W2...Second magnetic head for writing Agent Patent attorney Keiichi Nishikyo Figure 2, Figure 3

Claims (1)

[Claims] A rotary head type digital audio tape recorder that records data by tracing tracks on a magnetic tape or reproduces data from a magnetic tape with a head attached to a rotating drum, A track on the magnetic tape is traced at the first azimuth angle, and a recording area in which one series of data is sequentially arranged and recorded in the form of a digital signal is regarded as one channel, and multiple channels are arranged in parallel on the track. a first write head that records input data corresponding to each channel as it is being formed; a first reading head that reads a track on the magnetic tape at a second azimuth angle, and records input data corresponding to each channel while forming the plurality of channels in parallel on the magnetic tape. a second write head; a second read head that traces the same track in advance of the write head at the same azimuth angle as the write head and reads recorded data of each channel; input arbitrary data to be recorded in place of the read data of the selected channel among the read data read by the head from each channel, combine the input data with the read data of the channel that will not be rewritten, and A digital audio tape recorder comprising data replacement means for applying new data to a write head corresponding to each read head when the write head approaches the recording area of the read data. .