Patent Number: 6,307,903

Title: Low pass digital filter implemented in a modem of a television system

Abstract: A low pass digital filter using cascade polyphase recursive digital signal processing circuit. The filter in the receive direction may contain a re-sampling Hogenauer filter followed by an equalizer filter to correct for its non-flat pass-band spectral response. The output of the spectral equalizer may be processed by a poly-phase re-sampling filter to reduce the sample rate. A clean-up filter may insert two stop-band spectral intervals in the frequency response of the earlier stages. The filter in the receive direction may be implemented by using similar components in the reverse order.

Inventors: Harris; Fred (Lemon Grove, CA), Bril; Vlad (Campbell, CA)

Assignee: Telecruz Technology, Inc.

International Classification: H03H 17/02 (20060101); H03H 17/04 (20060101); H04B 001/10 ()

Expiration Date: 10/23/2018