Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1982-05-17
1984-11-06
Pellinen, A. D.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 7, H04H 500
Patent
active
044816588
ABSTRACT:
FM-broadcasting system comprising a FM-transmitter (1-16, 32-34) and a receiver (14-31, 35, 36) cooperating therewith, the transmission signal of which comprises a multiplex signal which is frequency-modulated on a main carrier wave, which multiplex signal comprises an audio-frequency information signal (L+R) and, in the case of a stereo transmission, a stereo information signal (L-R) modulated on a (38 kC) suppressed stereo subcarrier wave, also comprising a (19 kC) stereo pilot which is situated between the frequency spectra of the two information signals and a binary, differentially coded code signal which is phase-modulated on a (16.625 kC) code subcarrier wave which is situated outside the frequency spectra, and does not coincide with the (19 kC) stereo pilot, the receiver (14-31, 35, 36) comprising a pilot regeneration circuit (22-25) for regenerating the (19 kC) stereo pilot, the code signal having a bit repetition period which is an integral number of times the period of the (19 kC) stereo pilot. The signal delay (.tau.) required for differentially decoding the code signal is stabilized by a clock signal derived from the (19 kC) stereo pilot, use then being made of the fixed frequency relationship between the bit frequency of the code signal and the stereo pilot frequency, so that disturbances due to variations in the signal delay are avoided.
REFERENCES:
patent: 4246440 (1981-01-01), Van Der Heide et al.
patent: 4252995 (1981-02-01), Schmidt et al.
Gielis et al., "Station and Programme Identification in FM Sound Broadcasting", Philips Technical Review 39, No. 8, 1980, pp. 216-225, S20340005, 370-376.
Briody Thomas A.
Pellinen A. D.
Quarton Charles E.
Streeter William J.
U.S. Philips Corp.
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