Data buffer for the duration of cyclically recurrent buffer peri

Details Data buffer for the duration of cyclically recurrent buffer peri Data buffer for the duration of cyclically recurrent buffer peri

1990-05-22

1994-01-04

Dixon, Joseph L.

Excavating

371 375, 371 377, G06F 1200, G06F 1110, H03M 1300

Patent

active

052768279

ABSTRACT:
A buffer memory device comprising memory locations for successively storing successive groups of data units, the successive groups being presented during successive phases, the data units in each group having different buffer periods which are recurrent for all groups. A modulo address generator generates, for each group of data units, a series of addresses for selected locations in a memory wherein the data units will be stored, there being logic address intervals between the successive addresses in the relevant series which correspond to the buffer periods of the respective data units. In every two successive series the memory addresses are shifted by one address interval unit with respect to each other. An efficient data occupation of the memory can thus be realized with simple addressing, since the write addresses during any phase can be used as the read addresses for already stored data units. The buffer device can be used as an interleaver or de interleaver for error correction in CD apparatus.

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K. Pohlmann, "The Compact Disc Formats: Technology and Applications", J. Audio Eng. Soc., vol. 36, No. 4, Apr. 1988, pp. 250-287.

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