Digital filter bank
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United States of America Patent
Stats
-
Jul 12, 1983
Grant Date -
N/A
app pub date -
Mar 19, 1981
filing date -
Mar 19, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital filter bank (10) which has a discrete cosine transform section (12) and a polyphase network section (14) has the polyphase network section configured with a plurality of single input-double output digital filters (16). The filters have one of their outputs (36) independent of their present input signal. This permits a single multiplier-accumulator to use a 'memory swapping' procedure to accumulate all the requisite information from a complementary pair of the filters and to perform the necessary operations on it to compute an output value, while clearing the accumulator only once each sampling period.
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