Method and apparatus for assigning binary values to sample value

Details Method and apparatus for assigning binary values to sample value Method and apparatus for assigning binary values to sample value

1989-10-25

1992-09-29

Psitos, Aristotelis

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369124, 360 53, H04N 576, G11B 509, G11B 700

Patent

active

051518910

ABSTRACT:
A detector circuit assigns binary values to a series of sample values taken periodically from a waveform representing a binary pattern of marks on a record carrier, the pattern of marks nominally having a minimum run length of more than one sampling period. The detector determines whether the pattern is subject to a first or a second type of systematic error, the first type causing the marks on the record carrier to be systematically too short and the second type causing them to be too long. For each sample value a.sub.k, a plurality of successive sample values (a.sub.k-1, a.sub.k+1) which include the sample value a.sub.k are combined to generate one or more combined sample values. Each such combined sample value is compared with a threshold value (u'/u"), and in accordance with the results of such comparisons a binary value (A.sub.k ') is assigned to the sample a.sub.k using a logic relationship dependent on which type of systematic error is present. The detector may be included in an optical disc player.

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