Digital filter circuit for use in oversampling type analog/digit

Details Digital filter circuit for use in oversampling type analog/digit Digital filter circuit for use in oversampling type analog/digit

1992-01-30

1994-04-05

Mai, Tan V.

Boots, shoes, and leggings

364736, G06F 1531

Patent

active

053011341

ABSTRACT:
A digital filter circuit has two decimation filters, a first and a second, for performing two decimations with respect to a digital data of a predetermined sampling rate. The first decimation filter has a function of producing processing signals for a filter coefficient of the second decimation filter and providing such operational signal to the second decimation filter. Since the output of the first decimation filter is not a coded numeral value but is an output in the form of a processing signal for the filter coefficient of the second decimation filter, the first decimation filter can take the form of a decoder circuit and not an operational circuit and the second decimation filter can be simpler than that having a multiplier circuit of a conventional circuit. The scale of the overall circuit can be reduced and this contributes in the enhancement of high integration of large scale integrated circuits (LSIs), in the scaling down of chip areas and in reducing the manufacturing cost.

REFERENCES:
patent: 4937577 (1990-06-01), Rich et al.
patent: 5157395 (1992-10-01), Del Signore et al.

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