Demodulator capable of avoiding abnormal demodulation

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

H - Electricity

04

L

329/3

H04L 27/06 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1252525

Abstract of the Disclosure: 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 puil-in phase is detected by a pull-in phase discriminator (55) after establishment of synchronization. The reproduction of the carrier wave as momentarily phase shifted in a phase modulator (65, 65') with reference to the pull-in phase to be 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 demodulated 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?/2-phase one where n is a natural number between unity and three, both inclusive.

513187

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