EP 1090469 A1 20010411 - SIMPLIFIED AM STEREO DETECTOR
Title (en)
SIMPLIFIED AM STEREO DETECTOR
Title (de)
VEREINFACHTER AM-STEREO-DEKODER
Title (fr)
DETECTEUR STEREO AM SIMPLIFIE
Publication
Application
Priority
- GB 9901975 W 19990623
- US 10460498 A 19980624
Abstract (en)
[origin: WO9967905A1] Left and right stereo audio information is reproduced from a compatible quadrature amplitude modulation (C-QUAM) broadcast using a simplified approximation to true C-QUAM decoding. A synchronous detection approximation is used which avoids generating an envelope signal or calculating a cosine correction factor as in true C-QUAM decoding. The method requires less intensive computation power thereby allowing a digital signal processor to perform other functions at the same time. The method produces no perceivable distortion or artifacts when reproducing normal broadcast material.
IPC 1-7
IPC 8 full level
H04H 5/00 (2006.01); H04H 20/49 (2008.01)
IPC 8 main group level
H04H 1/00 (2006.01)
CPC (source: EP)
H04H 20/49 (2013.01)
Citation (search report)
See references of WO 9967905A1
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
WO 9967905 A1 19991229; CA 2335960 A1 19991229; EP 1090469 A1 20010411; JP 2002519889 A 20020702
DOCDB simple family (application)
GB 9901975 W 19990623; CA 2335960 A 19990623; EP 99926659 A 19990623; JP 2000556463 A 19990623