Digital filter used in a sigma-delta decoder wherein each input sample is involved in the computation of three consecutive pulse coded modulation (PCM) output samples. During one sigma-delta sampling period, the filter performs three parallel operations by multiplexing one adder running three times faster...http://www.google.es/patents/US4972360?utm_source=gb-gplus-sharePatente US4972360 - Digital filter for a modem sigma-delta analog-to-digital converter
Digital filter for a modem sigma-delta analog-to-digital converter
