FM stereo decoder and method using digital signal processing

Details FM stereo decoder and method using digital signal processing FM stereo decoder and method using digital signal processing

1993-08-05

1995-04-04

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

375259, 375340, 331 20, 331 25, H04H 500

Patent

active

054044057

ABSTRACT:
A digital FM stereo decoder uses the phase characteristics of linear phase FIR filters, together with a trignometric operation, to generate a 38 kHz subcarrier signal from a 19 kHz pilot. The subcarrier signal is mixed with the input composite signal from which the pilot has been removed to shift its L-R component to baseband; the linear phase FIR filters also maintain phase coherence between the subcarrier and the composite signals. A low distortion output is obtained without the use of a phase locked loop for the regeneration of the subcarrier signal.

REFERENCES:
patent: 4652838 (1987-03-01), Nossen
patent: 5249203 (1993-09-01), Loper
Krauss et al., Solid State Radio Engineering, John Wiley & Sons, 1980, pp. 318-322.
Manlove, "A Fuly Integrated High Performance FM Stereo Decoder", IEEE 1991 Custom Integrated Circuits Conf., pp. 24.6.1-24.6.3.
Haug et al., "A DSP-Based Stereo Decoder for Automotive Radio", SAE Technical Paper Series, 1990, No. 900244.

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