Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1974-07-10
1976-07-20
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329132, 329135, 329136, H03D 500
Patent
active
039709469
ABSTRACT:
Amplitude-and-phase modulated signals, as received, are represented by corresponding points on a reference signal plane of points to which results of demodulation, phase errors, and amplitude errors are preliminarily assigned. Responsive to the received signals, a detector produces position signals representative of the corresponding points. Responsive to the position signals, a demodulation and error-detection circuit produces result signals, phase error signals, and amplitude error signals representative of the results of demodulation, phase errors, and amplitude errors assigned to the corresponding points. Responsive to control signals specifying a predetermined area of the reference signal plane and to the position, phase error, and amplitude error signals, a selection circuit produces phase and amplitude control signals, which correct the reference signal plane to reduce the phase and amplitude errors of the position signals. After correction, the result signals become the demodulated signals.
REFERENCES:
patent: 3176231 (1965-03-01), Vallese et al.
patent: 3699463 (1972-10-01), Stone
Grimm Siegfried H.
Nippon Electric Company Ltd.
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