Demodulator capable of avoiding abnormal demodulation

Details Demodulator capable of avoiding abnormal demodulation Demodulator capable of avoiding abnormal demodulation

1986-07-07

1988-07-05

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329109, 329135, 375 39, H03D 300, H03D 318, H03K 910

Patent

active

047557630

ABSTRACT:
In a demodulator for use in demodulating a quadrature amplitude modulated signal into a first and a second digital signal by the use of a reproduction of a carrier wave, a pull-in phase is detected by a pull-in phase discriminator (55) after establishment of synchronization. The reproduction of the carrier wave is momentarily phase shifted in a phase modulator (65, 65') with reference to the pull-in phase and is produced as a phase shifted carrier signal. The resultant pull-in phase is momentarily corrected to avoid abnormal demodulation. Detection of the pull-in phase is possible either by monitoring a demodulating analog signal and the first and the second digital signals or by monitoring only the first and the second digital signals. The phase modulator may be either a two-phase modulator or a n.pi./2-phase one where n is a natural number between unity and three, both inclusive.

REFERENCES:
patent: 4285062 (1981-08-01), Yoshida et al.
patent: 4525676 (1985-06-01), Atobe et al.
patent: 4549142 (1985-10-01), Yoshida

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