JPH0677372B2 - Rotating head type regenerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a so-called multi-channel which reproduces a recording signal from a large number of tracks each formed in a plurality of parallel regions on a recording medium using a rotary head. The present invention relates to a rotary head type reproducing device.

[Conventional technology]

In recent years, various techniques for recording an audio signal using a rotary head have been proposed along with the improvement in audio quality of the audio signal. For example, as a method of making audio high-fidelity in a video tape recorder, FM modulation recording by a rotating head, and further as a dedicated audio unit, digital modulation recording by a rotating head is known.

In response to this, an audio recorder which devises an audio signal on the time axis and digitally records it has been devised.

Hereinafter, an example of an audio tape recorder for time-axially compressing an audio signal using a rotating head and digitally recording the signal will be briefly described.

FIG. 2 is a diagram showing an example of a tape running system of a conventional audio tape recorder of this type. In FIG. 2, reference numeral 1 is a magnetic tape, and 2 is a rotating cylinder that holds rotating heads 3 and 4. As a result, the heads 3 and 4 trace the tape 1 obliquely to record an audio signal. Whenever the heads 3 and 4 rotate 36 °, time-compressed audio signals are recorded in each of the six areas formed in the longitudinal direction of the tape 1, so that a total of 6 channels of audio signals can be recorded. That is, a dedicated tape recorder can be obtained.

The tape recorder will be briefly described below. FIG. 2 is a diagram showing a tape running system of the above-mentioned tape recorder, and FIG. 3 is a diagram showing recording loci on a tape by this tape recorder.

In FIG. 3, CH1 to CH6 respectively trace head 3 or head 4 from A to B, B to C, C to D, D to E, E to F, F to G in FIG. It is an area where the audio signal is recorded during the period. It is possible to separately record audio signals in each area, and so-called azimuth overwriting is performed in each area.

Here, as is well known for one track on each area, 1/60
In addition to audio data for seconds, synchronization data, address data, CRC (Cyclic Redudancy Check) data, error correction parity data, and additional data called ID data are recorded.

FIG. 4 is a block diagram showing a schematic configuration of a reproducing system in a conventional device of this type. In FIG. 2, 25 is a reproduction amplifier, 26 is a gate circuit, 27 is a waveform shaping circuit, and 28 is CR.
CC (detection circuit as far as CRC data mentioned above), 29 is a synchronization detection circuit, 30 is MPX (multiplexer), 31 and 32 are memories, 33 is ERC (error correction circuit), 34 is memory, 35 is system controller, 36 Is an operation unit, and 38 is a capstan control circuit.

In the conventional device configured as shown in FIG. 2, the signal output from the reproduction amplifier 25 is gated by the gate circuit 26. The waveform shaped circuit 27 performs processing such as digital demodulation on the gated signal, and outputs the waveform shaped output.
It leads to the CRCC 28 and the synchronization detection circuit 29. In the CRCC 28, a known error check based on the CRC data is performed in synchronization with the synchronization signal from the synchronization detection circuit 29, and the MPX 30 alternately supplies and stores the data for each track in the memories 31 and 32, respectively.
Then, ERC is applied to the data stored in these memories 31 and 32.
At 13, processing such as error correction is performed.

The error-corrected audio data is digital-analog (D / A) converter 3 with the time axis extended.
It is supplied to 7 and it is regarded as an analog audio signal, and terminal 40
Will be output.

On the other hand, the above-mentioned ID data is supplied and stored in the memory 34.
The ID data includes, for example, time information such as recording time, tape traveling direction information, program number, cue mark information track pitch information, and the like. The ID data including these pieces of information is used by the system controller 35 to perform, for example, capstan control, so that a desired function is realized.

Also, the wind pulse generator 22 is a system controller.
Based on the reproduction area designated by 35 and the PG obtained from the rotation detector 21 of the rotary head, a window pulse for controlling the gate circuit 26 which gates only the reproduction signal from the designated area is generated.

[Problems to be solved by the invention]

By the way, it is convenient if the time information and the mark information in the above-mentioned ID data can be detected from an area other than the area where audio reproduction is performed. For example, it is considered that a convenient function is to reproduce the head portion of the recording in the entire area for several seconds.

However, in the conventional device, it is impossible to read the ID data in real time because signal processing such as error correction must be performed before reading the ID data.

That is, the time required to perform signal processing such as error correction on the data for one track is considerably long, and six such signal processing circuits are required to read the ID data from all six channels.

The present invention has been made in order to solve the above-mentioned conventional problems, and provides a rotary head type reproducing apparatus capable of reading additional data recorded in a plurality of areas of a recording medium together with information signals in two or more areas. The purpose is to get.

[Means for solving problems]

A rotary head type reproducing apparatus according to the present invention comprises means for designating an area for reproducing an information signal in a plurality of parallel areas on a recording medium, and the area designated by the designating means in the reproduction signal of the rotary head. Means for extracting the information data, performing error correction on the extracted information data by using the redundant data, and recorded in two or more areas of the plurality of areas from the reproduction signal of the rotary head. Means for extracting the additional data from the reproduction signal before extracting the information data of the designated area without passing through the error correction means.

[Action]

With the above configuration, error correction is not performed on the additional data, and the time required for error correction is not required. Therefore, the additional data in two or more areas can be read by a single system circuit. You can

〔Example〕

FIG. 1 is a block diagram showing a schematic structure of a reproducing apparatus as an embodiment of the present invention. In the figure, 41 is a block counter for counting the number of data blocks of reproduced data, 42 is a word counter for counting the number of data words in each block, 43 is a shift register (SR) for serial-parallel conversion of ID data, Reference numeral 45 is an address counter for address control of the memory 44, and the same numbers as in FIG. 4 indicate the same or corresponding parts. The waveform shaping circuit 27 ', CRCC
Two lines 28 'and a sync detecting circuit 29' are provided corresponding to the reproduction outputs of the heads 3 and 4, respectively.

In the device of FIG. 1, the block counter 41 measures the number of data blocks in response to the output of the synchronization detection circuit 29 '.
This block counter 41 works in conjunction with the word counter 5.
Only the ID data is extracted in real time by the shift register 43 which is a transfer means. That is, multiplexer 3
0, the memory 31, 32, before performing the process by the error correction circuit 33, the shift register 43 extracts the ID data, and
A plurality of areas are stored in the memory 44 for holding ID data. By supplying the stored data to the system controller 35, for example, the system control as described above using the ID data becomes possible. That is, since the block counter 41 and the word counter 5 are provided, the ID data reproduced at a predetermined timing can be detected, and the entire area (channel) of the recording medium can be covered during the period when the rotating head makes one rotation. (ID) data can be read.

〔The invention's effect〕

As described above, according to the present invention, the additional data recorded together with the information data in each area of the recording medium can be taken out in real time while the rotating head makes one rotation over two or more areas. There is an effect that various functions using can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic structure of a main part of a reproducing system of a multi-channel tape recorder as an embodiment of the present invention, and FIG. 2 is a diagram showing a part of a tape running system of a conventional multi-channel tape recorder, FIG. 3 is a diagram showing a recording track on a tape, and FIG. 4 is a block diagram showing a schematic configuration of a main part of a reproducing system of a conventional multi-channel tape recorder. In the figure, 26 and 26 'are gate circuits, 27 and 27' are waveform shaping circuits, 28 and 28 'are CRCCs, 29 and 29' are sync detection circuits, 30 is a multiplexer, 31 and 32 are memories, and 33 is error correction. Circuit, 34
Is a memory, 35 is a system controller, 36 is an operation unit, 37
Is a D / A converter, 41 is a block counter, 42 is a word counter, 43 is a shift register, 44 is a memory, and 45 is an address counter.

Front page continued (72) Inventor Takashi Kobayashi 770 Shimonoge, Takatsu-ku, Kawasaki, Kanagawa Canon Inc., Tamagawa Works (72) Inventor Tetsuya Yukai, 770, Shimonoge, Takatsu-ku, Kawasaki, Kanagawa Prefecture (72) Inventor Hiroji Takahashi 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc. Tamagawa Plant

Claims (1)

[Claims] 1. A recording signal is reproduced by using a rotary head from a recording medium in which a plurality of regions in which a large number of diagonal tracks in which digital signals each containing information data, additional data and redundant data for error correction are recorded are arranged in parallel. In the device, in the plurality of areas, means for designating an area for reproducing an information signal, and in the reproduction signal of the rotary head, extracting the information data reproduced from the area designated by the designating means, Means for performing error correction on the extracted information data using the redundant data; and the additional data recorded in two or more areas of the plurality of areas from the reproduction signal of the rotary head, in the designated area. And a means for extracting from the reproduction signal before the information data is extracted without passing through the error correction means.