Dynamic magnetic information storage or retrieval – Record editing
Patent
1981-08-28
1983-09-06
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Record editing
360 32, G11B 2702, G11B 500
Patent
active
044032617
ABSTRACT:
Electronic editing of a recording digital signal is carried out such that any errors created by the editing process are correctable. The digital signal is given protection from errors, for example by a cross-interleaving technique, so that multiple errors in a code sequence length can be corrected when the signal is reproduced. The edit cut-in and cut-out points are controlled so that if multiple editing is carried out, fewer than m+1 errors will be generated, and the edited signal will be free of clicks caused by uncorrectable error. The permitted points for cut-in and cut-out can be separated by a distance greater than the code sequence length. Alternatively, if cross-interleaving is carried out such that digital words are grouped into blocks and provided with respective different delays that are integral multiples of D block lengths, the interval between such points can be selected to correspond to T block lengths, such that the least common multiple of D and T is greater than the code sequence length.
REFERENCES:
patent: 4146099 (1979-03-01), Matsushima et al.
patent: 4238852 (1980-12-01), Iga et al.
patent: 4309726 (1982-01-01), Tanaka et al.
patent: 4352129 (1952-09-01), Baldwin
Canney Vincent P.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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