Digital high-pass filter having baseline restoration means

Details Digital high-pass filter having baseline restoration means Digital high-pass filter having baseline restoration means

1994-05-19

1997-03-25

Tse, Young T.

Pulse or digital communications

Receivers

Interference or noise reduction

36472401, 333165, 327551, 327559, H04B 110

Patent

active

056152345

ABSTRACT:
A digital high-pass filter derived from a digital low-pass filter of conventional design. The digital low-pass filter periodically calculates respective low-pass filter output values. Corresponding high-pass filter output values are then calculated by subtracting the low-pass filter output values from input samples provided by digitizing an input signal. The high-pass filter output values are then used to generate samples which are applied to a digital-to-analog converter for outputting a high-pass filtered replica of the input signal. The digital high-pass filter compensates for sudden, relatively large changes in the input signal by comparing the low-pass filter output value to the input sample and, in the event that there is a large discrepancy therebetween, setting the low-pass filter output value to the input sample before calculating the high-pass filter output value.

REFERENCES:
patent: 4125812 (1978-11-01), Polonio
patent: 4237424 (1980-12-01), Weiner
patent: 5303173 (1994-04-01), Mori et al.

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