Stereo signal demodulator in a four-channel stereo broadcast rec

Details Stereo signal demodulator in a four-channel stereo broadcast rec Stereo signal demodulator in a four-channel stereo broadcast rec

1975-06-23

1976-06-01

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

179 1GQ, 179 15BT, 329122, 329126, H03D 318

Patent

active

039612767

ABSTRACT:
A composite signal for a four-channel stereo broadcast includes a main channel component, first and second sub-channel components and at least one pilot signal. The composite signal is fed to a stereo signal demodulator through an FM tuner. The stereo signal demodulator derives the pilot signal out of the composite signal to produce first and second sampling pulse series, each sampling pulse having a different repetition frequency. The first sampling pulse series is fed to a delay circuit that is provided with electronic delay lines such as dynamic shift registers. The delay circuit is switched by the first sampling pulse series for sampling the composite signal, to shift sampled values. Sampled values delayed in the delay circuit are fed to a logical circuit to derive the main and first sub-channel components. The second sampling pulse series is supplied to a switching circuit for demodulating the second sub-channel component. The main and first sub-channel components are substantially equalized to the second sub-channel component in delay time.

REFERENCES:
patent: 3787629 (1974-01-01), Limberg
patent: 3814858 (1974-06-01), Parker

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