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

H - Electricity

03

H

H03H 17/02 (2006.01)

Patent

CA 2149482

DIGITAL HIGH-PASS FILTER HAVING BASELINE RESTORATION MEANS 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.

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