Allen Roy

US Patent:

56489870, Jul 15, 1997

Filed:

Mar 24, 1994

Appl. No.:

8/216936

Inventors:

Jian Yang - Norwood MA
Chandrakant Bhailalbhai Patel - Hopewell NJ
Tianmin Liu - Lawrenceville NJ
Allen Le Roy Limberg - Ringoes NJ

Assignee:

Samsung Electronics Co., Ltd. - Kyungki-Do

International Classification:

H04L 2701
H04N 521

US Classification:

375232

Abstract:

In response to a received carrier wave modulated in accordance with a digital signal, a digital radio receiver recovers in digital form a modulating signal that is at times subject to undesirable amounts of multipath distortion. This recovered modulating signal is applied as respective input signals to first and second finite-impulse-response (FIR) filters, each of an N-tap type, the taps of which are adaptively weighted. The first FIR filter responds to the modulating signal to supply an output signal in which multipath distortion is suppressed. The second FIR filter responds to the modulating signal to generate corrections for the tap weights of the first FIR filter, which corrections are generated more rapidly than can be done with a microprocessor of the type commonly known as a "digital signal processor" or "DSP". A digital comparator compares samples of the first FIR filter response to corresponding samples of an ideal response, thereby to generate updated tap weights for the second FIR filter.