Composite finite impulse response digital filter

Details Composite finite impulse response digital filter Composite finite impulse response digital filter

1989-03-27

1990-09-18

Harkcom, Gary V.

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G06F 1531

Patent

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049583115

ABSTRACT:
A composite finite impulse response digital filter for use in an image processing apparatus or the like includes a plurality of sub-filters connected in series. In each sub-filter, a random access memory (RAM) is provided for storing an input data and a barrel shifter is provided for shifting the data to a least significant bit (LSB) or most significant bit (MSB) side over the number of shifts corresponding to a first control signal. Because of the provision of the barrel shifter in each sub-circuit, it is not necessary to shift a data input into an input terminal over a predetermined number of bits before storing into the RAM. Thus, the memory capacity of the RAM can be significantly reduced in size.

REFERENCES:
patent: 4561065 (1985-12-01), Matsuda
patent: 4782459 (1988-11-01), Johnston

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