Am-fm combined stereo receiver

Details Am-fm combined stereo receiver Am-fm combined stereo receiver

H - Electricity

04

B

H04B 1/26 (2006.01) H03D 5/00 (2006.01) H04B 1/16 (2006.01) H04S 1/00 (2006.01) H04H 5/00 (2006.01)

Patent

CA 2100342

An improved AM-FM combined stereo receiver (100) is provided having a single processor (155) for removing, in the FM mode, arctangent distortron, and in the AM mode, to process the phase term from arctangent {L - R /1 + L + R} to determine {L - R/1 + L + R}. Further, the radio includes a single discriminator circuit (161, 137, 139) wherein, in the FM mode, the discriminator tank circuit (137, 139) is used to convert frequency deviation to baseband audio and, in the AM mode, the discriminator tank circuit is used as the frequency determining element for the voltage controlled oscillator (VCO) (161), the VCO being used to translate the intermediate frequency (IF) signal to baseband.

Un récepteur stéréo amélioré combinant AM-FM (100) est présenté et possède un seul processeur (155) pour retirer, dans le mode FM, la distorsion arctangente, et pour traiter dans le mode AM le terme de la phase de l'arctangente {L - R /1 + L +R} afin de déterminer {L-R/1+L+R}. Au surplus, la radio comprend un seul circuit discriminateur (161, 137,139) où, dans le mode FM, le circuit résonant du discriminateur (137, 139) sert à convertir la déviation de la fréquence dans la bande de base audio et, dans le mode AM, le circuit résonant du discriminateur sert comme élément de détermination de la fréquence pour l'oscillateur à fréquence commandée (VCO), le VCO servant à traduire la fréquence intermédiaire (FI) dans la bande de base .

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