Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...
Patent
1997-08-11
1999-05-18
Kinkead, Arnold
Demodulators
Phase shift keying or quadrature amplitude demodulator
Input signal combined with local oscillator or carrier...
329306, 375324, 375326, 375344, H03K9/00
Patent
active
059054050
ABSTRACT:
In a quadrature circuit, when a large frequency variation is detected, the carrier reproduction is conducted by using the carrier reproduction loop having a signal distortion but a small delay, and then, if the reproduced carrier becomes stable at some degree, the carrier reproduction is conducted by using the carrier reproduction loop having a less signal distortion but a large delay. When the number of the errors detected by an error detecting and correcting circuit is larger than a predetermined value, a selector supplies a digital in-phase signal and a digital quadrature signal outputted from A/D converters located before a waveform equalizer, to a carrier phase error detecting circuit which generates a digital phase error signal feedback through a D/A converter to a local carrier oscillator. When the number of errors detected by the error detecting/correcting circuit is not larger than the predetermined value, the selector supplies a digital in-phase demodulated signal and a digital quadrature demodulated signal outputted from the waveform equalizer to the carrier phase error detecting circuit.
Kinkead Arnold
NEC Corporation
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