Digital filter

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364724011, G06F 1710

Patent

active

056489226

ABSTRACT:
An improved digital filter capable of advantageously completing a filter operation through a convolution using a filter coefficient used in each stage of multi-stage digital filters and previously stored in a ROM, which includes a control unit for outputting a control signal; an input buffer for buffering a data inputted in accordance with the control signal and for outputting the buffered data; a data storing unit for storing a data outputted from the input buffer in accordance with a control signal applied thereto; a ROM for storing a filter coefficient obtained through an operation of the filter coefficient of a multi-stage; an addressing unit for addressing an address of the filter coefficient stored in the ROM; and a multiplying and accumulating unit for convoluting the data outputted from the data storing unit and the ROM.

REFERENCES:
patent: 4727505 (1988-02-01), Konishi et al.
patent: 4896285 (1990-01-01), Ishikawa et al.
patent: 5018090 (1991-05-01), Shiratsuchi
patent: 5471411 (1995-11-01), Adams et al.
patent: 5515402 (1996-05-01), Chester
patent: 5592403 (1997-01-01), Trager et al.
"A CMOS Stereo 16-Bit D/A Converter For Digital Audio", Peter J. A. Naus et al., IEEE Journal fo Solid-State Circuits, vol. SC-22, No. 3, Jun. 1987.
FIR Filtering Using Vector Transformation and Convolution Processor, Li, IEEE International Symposium on Circuits and Systems, pp. 1223-1226 1990.

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