Dynamic magnetic information storage or retrieval – Splitting one information signal for recording on plural...
Patent
1984-07-27
1986-11-11
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Splitting one information signal for recording on plural...
360 32, 371 39, 371 40, G11B 502, G11B 509, G06F 1110
Patent
active
046225986
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method for recording PCM signals, according to which one-channel PCM signals are distributed and recorded on plural recording tracks. More particularly, it relates to the method for recording PCM signals according to which the effect of encoding such as interleaving or addition of error correcting codes is not cancelled at the time of distribution and recording.
BACKGROUND ART
In recording or reproducing PCM signals in general, coding errors are caused in known manner due to defects in the recording medium, troubles in recording or reproduction, noises or disturbances. Thus an encoder is provided at the recording side to effect interleaving (data rearrangement) or addition of parity or error correcting codes, while a decoder is also provided at the reproducing side to effect deinterleaving (the reverse of interleaving), error detection and correction, or data interpolation.
When plural recording tracks are associated with each channel of single-channel or multichannel PCM signals for recording or reproduction, the signals are first passed through the aforementioned encoder, and are then distributed by switching distributing means, such as a multiplexer, to the recording heads. In this case, even when the interleaving operation is performed at the encoder in accordance with a predetermined rule, the effect of interleaving may be lowered at the time that the signals are distributed to the respective tracks by the multiplexer. In addition, since the error correcting code words are provided to the respective word rows allotted to plural tracks, it becomes impossible to perform a normal error correction in the event that the signals are absent in a given track for a prolonged time. Moreover, the allowable limit for error occurrence becomes narrow as a whole.
In view of the foregoing, it is a principal object of the present invention to provide a method of recording PCM signals according to which, when the PCM signals for one channel are distributed and recorded in plural tracks, the encoding operation such as the aforementioned interleaving or addition of error code may be improved in validity, thus assuring high-quality recording and reproduction of the PCM signals.
DISCLOSURE OF THE INVENTION
For accomplishing the above object, the present invention contemplates to provide a method for recording PCM signals wherein each channel of the PCM signals of at least one channel is correspondingly distributed to plural recording tracks for recording, characterized in that respective words of the PCM signals for one channel are correspondingly distributed to said recording tracks by switching distributing means in accordance with a predetermined matrix pattern, these PCM signals composed of these distributed words and associated with the respective tracks are supplied to plural recording heads through respective separate encoders adapted for separately correcting code error in such a manner that plural recording tracks are formed on the recording medium.
The aforementioned switching distributing means may for example be so designed that word sets each consisting of a predetermined number of consecutive words are distributed successively to respective recording tracks. Alternatively, it may be so designed that a plurality of consecutive words of the input PCM signals equal to the number of the recording tracks for one-channel PCT input signals are allotted word by word to said recording tracks. The aforementioned encoder is preferably so designed that the word row or group corresponding to one recording track is divided into the odd number words and even number words in the order of input, the odd and even number words thus separated from each other are shifted by a predetermined time interval from each other, the odd and even number words are subjected separately to code error correcting encoding, and the odd and even number words thus shifted in timing and coded are combined and supplied as output.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic plan view s
REFERENCES:
patent: 4211997 (1980-07-01), Rudnick et al.
patent: 4238852 (1980-12-01), Iga et al.
patent: 4389681 (1983-06-01), Tanaka et al.
patent: 4393502 (1983-07-01), Tanaka et al.
patent: 4398224 (1983-08-01), Watanabe
patent: 4403261 (1983-09-01), Tanaka
Brandes Claudia
Doi Toshitada
Lagadec Roger
Bowler Alyssa H.
Cardillo Raymond F.
Eslinger Lewis H.
Sony Corporation
Willi Studer AG
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