Title (en)

Stereo multiplex-signal transmission with one single sideband modulation of the stereo-difference signal for frequency modulated broadcast system

Title (de)

Stereo-Multiplex-Signalübertragung mit einer Einseitenbandmodulation des Stereo-Differenzsignals für frequenzmodulierten Rundfunksystem

Title (fr)

Transmission de signaux stéréo multiplexés avec une modulation à bande latérale unique du signal différence stéréo pour système de radiodiffusion en modulation de fréquence

Publication

EP 1071232 A1 20010124 (EN)

Application

EP 99114353 A 19990721

Priority

EP 99114353 A 19990721

Abstract (en)

To increase the signal to noise ratio of a frequency-demodulated stereo audio signal the stereo-multiplex signal at the transmitter side is modified so that the information of the stereo-difference signal is carried in only one sideband of the amplitude modulated stereo-difference signal, preferably in the lower sideband. Therefore, receivers which generate the stereo-difference signal on basis of only the lower sideband produce a higher signal to noise ratio of the frequency demodulated stereo audio signal than conventional FM-stereo receivers, because the noise bandwidth is reduced and in case only the lower sideband carries the information of the stereo-difference signal also the noise power spectral density is reduced. Conventional FM-stereo-receivers reproduce the modified stereo-multiplex signal without increase or decrease in quality. <IMAGE> <IMAGE>

IPC 1-7

H04H 5/00

IPC 8 full level

H04H 20/48 (2008.01)

IPC 8 main group level

H04H 1/00 (2006.01)

CPC (source: EP)

H04H 20/48 (2013.01)

Citation (search report)

• [X] US 4771464 A 19880913 - KADIN JEFFREY B [US], et al
• [X] US 3883700 A 19750513 - BAUER BENJAMIN B, et al
• [A] US 5077616 A 19911231 - KLUTH HANS-JUERGEN [DE]

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 1071232 A1 20010124

DOCDB simple family (application)

EP 99114353 A 19990721