DC gain invariant filter implementation

Details DC gain invariant filter implementation DC gain invariant filter implementation

1997-08-18

1998-11-17

Ngo, Chuong Dinh

Boots, shoes, and leggings

36472416, G06F 1710

Patent

active

058386009

ABSTRACT:
A filtering circuit suitable for use in a video sample rate converter provides a constant direct current (DC) gain irrespective of realization errors, and reduces hardware requirements. The circuit includes an input terminal for receiving an input signal. A first delay unit delays the input signal to generate a first delayed signal. A subtracting unit subtracts the input signal from the first delayed signal to generate a difference signal. A second delay unit delays the difference signal to generate a second delayed signal. A reference delay unit delays the first delayed signal by a predetermined reference time period to generate a reference signal. A filtering unit filters the second delayed signal to generate a filtered signal. An adding unit adds the reference signal to the filtered signal to generate an output signal. The circuit can be modified to include a multiplication unit for multiplying the input signal, the first delayed signal or the output signal by a given constant to obtain a desired direct current (DC) gain. According to at least one preferred embodiment, the filtering unit is constructed as a finite impulse response (FIR) filter. According to another embodiment, the filtering unit is constructed as an infinite impulse response (IIR) filter.

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Knutson, et al. "An Optimal Approach to Digital Raster Mapper Design", IEEE, May 91, pp. 72-73.

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