Stereo demultiplexer

Details Stereo demultiplexer Stereo demultiplexer

2007-11-13

2007-11-13

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

C375S148000, C375S347000, C375S152000, C381S004000, C381S015000, C455S212000, C455S218000

Reexamination Certificate

active

10143057

ABSTRACT:
A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the modulated difference signal for a noise reduction. The proposed stereo demultiplexer derives the in phase component and the in quadrature component of the difference signal with a minimized number of sinus and cosinus calculations by first downconverting the modulated difference signal to a not synchronized complex baseband signal on basis of a fixed frequency, thereafter a complex sampling rate decimation unit sampling rate decimates the not synchronized complex baseband signal with a factor N and a second complex mixer synchronizes and coherent demodulates the sampling rate decimated not synchronized baseband signal on basis of a first complex carrier signal derived on basis of the pilot carrier signal and the fixed frequency. The proposed stereo demultiplexer can easily be combined with a noise reduction system and the digital demodulation of the RDS and ARI signals.

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