Global patent index - EP 1090469 A1

EP 1090469 A1 2001-04-11 - SIMPLIFIED AM STEREO DETECTOR

Title (en)

SIMPLIFIED AM STEREO DETECTOR

Title (de)

VEREINFACHTER AM-STEREO-DEKODER

Title (fr)

DETECTEUR STEREO AM SIMPLIFIE

Publication

EP 1090469 A1 (EN)

Application

EP 99926659 A

Priority

  • GB 9901975 W
  • US 10460498 A

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 (main, further and additional classification)

H04H 5/00

IPC 8 full level (invention and additional information)

H04H 20/49 (2008.01)

IPC 8 main group level (invention and additional information)

H04H 1/00 (2006.01)

CPC (invention and additional information)

H04H 20/49 (2013.01)

Citation (search report)

See references of WO 9967905A1

Designated contracting state (EPC)

DE ES FR GB IT

EPO simple patent family

WO 9967905 A1 19991229; CA 2335960 A1 19991229; EP 1090469 A1 20010411; JP 2002519889 A 20020702

INPADOC legal status

2002-02-27 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20011213

2001-04-11 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20001108

2001-04-11 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE ES FR GB IT