JPH03245367A - Helical scan type magnetic recording and reproducing method - Google Patents

Abstract

PURPOSE:To allow the recording and reproducing of the signals quantized by large number of bits while maintaining the interchangeability with an ordinary DAT (digital-audio tape recorder) by dividing the plural digits of an input signal to two digits, recording the digital value of the 1st part in a prescribed part and recording the digital value of the 2nd part after adjusting a time base. CONSTITUTION:The input signal is formed as 18 bits larger than 16 number of the quantization bits of the ordinary DAT and the upper 16 bits thereof are recorded in a main area in the same manner as with the ordinary DAT. The lower two bits 2 are shifted in the time base from the upper 16 bits so as to be recorded in sub-areas 1, 2 by a time base adjusting means and are recorded therein. The data quantized by the many bits is recordable in the sub-areas 1, 2 in such a manner while the interchangeability is maintained, the high-quality signals are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a helical scan type magnetic recording and reproducing method.

[Conventional technology]

2. Description of the Related Art As a helical scan magnetic recording device, a digital audio recorder (DAT) that records audio signals and the like has been known.

To explain in more detail that the conventional DAT uses a 16-bit analog input signal, as shown in FIG.
03 and 5UB2 timing signals 102, and in response to the frame signal, generates a memory A/B write gate signal 105 at a predetermined timing as shown. As mentioned above, the memory of the time axis adjustment circuit 30a corresponds to the memory 11 in FIG. 1, but here, one memory is treated as two types, ie, memory A and memory B, depending on the area in which it is used. . During recording, the upper 16 bits of the human voice signal are continuously written to memories A and B, but as shown in the figure, when writing to memory A, the read gate signal 1 of memory B
Generate 07. On the other hand, when data is being written to memory B, a read gate signal 106 for memory A is generated. That is, the signal written in memory A is read out in response to the read gate signal 106 of memory A in the next frame.

The signal written to memory B is written in the same way, and 1 A read operation is performed.

The lower two bits of the input signal are processed by the time axis adjustment circuit 30b, and write and read operations are performed at the timing shown in FIG. That is, the lower two bits are stored using the memory C/D write gate signal 108, which is the same signal as the memory A/B write gate signal, and the signal stored in memory C is applied to the read gate signal +09 of memory C in the next frame. Read in response. The timing of this readout is the timing at which the signal should be recorded in subarea 1. Similarly, a signal is also recorded in sub area 2. The time axis adjustment circuit 30b corresponds to the memory 15 in FIG. 1, but here one memory is treated as two, ie, memory C and memory D, depending on the area used.

On the other hand, a DAT tape recorded in the above manner is shown in the block diagram of FIG. Reproduced by a helical scan magnetic reproducing device. In FIG. 7, the signals recorded in main area 3 and subareas 1 and 2, that is, the upper 16 bits, are reproduced by magnetic head 214a (A head) and magnetic head 14b (B head), and are subjected to known waveform equalization. Circuit 41, NRZ
Conversion circuit 42, serial parallel conversion circuit 43.107
The signal processed by the 8 conversion circuit 44 and recorded in the main area 3 is further processed by a known time axis adjustment circuit 49, a deinterleave circuit 48, an error correction circuit 45, and an interpolation circuit 46.
and processed by the D/A converter 47a.
A is converted and output. On the other hand, the lower two bit signals recorded in subareas 1 and 2 are sent to the 10/8 conversion circuit 44.
The data is extracted from the output by a known packed data extraction circuit 53, and errors are corrected by known error correction circuits 51a and 51b for the left and right channels by 2 bits by the 2-bit data extraction circuit. Next, the time axes of the left and right channel signals are adjusted to match the timing of the upper 16 bit signals by time axis adjustment circuits 52a and 52b.
18-bit D/A converters 47a and 47, respectively.
The signal is sent to the 18-bit signal along with the upper 16 bits, which is D/A converted and output.

The operation of the time axis adjustment circuits 49, 52a and 52b will be explained in more detail using the time chart shown in FIG. 8. In FIG. , frame signal 11
1. Head switching signal 112.5 UBI timing signal IH1SUB2 timing signal 114 is generated at the timing shown.

Next, a write gate signal 117 for memory B is generated in response to frame signal 11.1 and 5UBI timing signal 113.5UB2 timing signal 114, and head A
, B of the signals from memory A and memory B that constitute the time axis adjustment circuit 49.
write to. At the timing indicating the memory B of the read gate signal 115 of the memory A/B which has a predetermined timing relationship with the frame signal that occurs subsequently, the memory B
Read and output the signal data. Similarly, signals from heads A and B are written to and read from memory A.

Similarly, the lower two bits of the signal are sent to the time axis adjustment circuit 52.
It is written into the memory C12 by the write gate signal 119 of the memory C of memory C of a, and is read out at the timing indicated by the memory C of the 3 4 read gate signal 118 of the memory C/D. Similarly, only writing and reading are performed in the memory D of the time axis adjustment port 52b.

〔Effect of the invention〕

As mentioned above, the helical scan type magnetic recording method of the present invention is performed using the upper 16 bits specified in the standard in the main area of the magnetic tape, which has traditionally been used for recording audio signals, etc. It is compatible and can be reproduced by the magnetic reproduction method. Moreover, since data quantized with even more bits can be recorded in the subarea while maintaining this compatibility, a higher quality signal can be obtained if reproduced by an apparatus using the helical scan type reproduction method of the present invention. Furthermore, since the lower two bits recorded in the sub-area are recorded in the sub-code area in a back (PACK) 4G format, no malfunction will occur even when played back with a conventional playback device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a helical scan magnetic recording device according to a first embodiment of the present invention, FIGS. 2 and 3 are diagrams explaining the operation of the first embodiment, and FIG. A block diagram of the embodiment, FIGS. 5 and 6 are diagrams for explaining the operation of the second embodiment, FIG. 7 is a block diagram of the helical scan type magnetic reproducing apparatus of the present invention, and FIG. FIG. 2 is a diagram for explaining the operation of the second embodiment. 2...Sub area, 3...Main area, l011
0b...A/D converter, 11. 15...Memory, 1B, 70.71-...Adder, 14.14a,
+4b...magnetic field, 17...synchronous signal generation circuit,
18.19.20... Evening 3Qa, 30b, 49.
52a, 52b--time axis adjustment circuit, 47b...
D/A converter. 1°108°12° Heraima, 47a. Inventors: Tomohiro Mori, Yoshi Nami, Nobu Hisade, Victor Japan Co., Ltd.

Claims (2)

[Claims] (1) In response to a synchronization signal, the input signal converted into a digital value is recorded in a predetermined part of the track by one scan by a rotating head of the magnetic recording medium, and is arbitrarily recorded in another part of the track by one scan. In a helical scan magnetic recording method for recording a signal, the plurality of digits of the input signal converted into a digital value are separated into a first part and a second part, and the digital value of the first part is recorded in the predetermined part. A helical scan type magnetic recording method, wherein the digital value of the second portion is recorded in the other portion after adjusting the time axis. (2) reproducing a first digital signal recorded on the magnetic recording medium in a predetermined portion of a track by one scan by a rotary head of the recording medium in response to a synchronization signal recorded on the magnetic recording medium; In the helical scan magnetic reproducing method for reproducing a second digital signal recorded in another part of a track by one scan, the time axis of the second digital signal is adjusted and the second digital signal is combined with the first digital signal. A helical scan type magnetic reproducing method characterized in that a number of digital signals equal to the sum of the number of digits of the first digital signal and the second digital signal are generated from the second digital signal.