Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1981-12-21
1984-07-03
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329110, 375 83, 375104, 375110, H04L 2722
Patent
active
044582064
ABSTRACT:
An energy synchronized demodulator circuit is disclosed having a differential input to single ended converter coupled to a sync detect circuit which provides a detection signal in response to the modulated input signal. The detection signal is integrated over time, and a threshold detector provides an output when the detection signal exceeds a predetermined threshold level. A filter provides a constant level output signal indicative of the presence of valid data. Synchronized demodulation is provided by a correlation between phase or frequency in predetermined bit intervals of the detection signal. Synchronization is initiated by the initial burst of input signal energy received by the differential input.
REFERENCES:
patent: 3571712 (1971-03-01), Hellwarth et al.
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patent: 3656064 (1972-04-01), Giles et al.
patent: 4019149 (1977-04-01), Kustka et al.
Nosaka, K. et al., "PSK Demodulator with Delay Line for the PCM-TDMA System", IEEE Trans. Commun. Tech., vol. COM-18, No. 4, pp.427-434, Aug. 70.
Waggener, W., "Designer's Guide to Digital Synchronization Circuits, Part I", EDN, vol. 21, No. 14, pp. 56-61, Aug. 76.
Dellande Brian W.
Wurzburg Henry
Grimm Siegfried H.
King Robert L.
Motorola Inc.
Myers Jeffrey Van
Paxman W. R.
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