Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1978-10-16
1979-11-13
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
325 38B, 325304, 325321, H03K 900
Patent
active
041745027
ABSTRACT:
A detector for delta modulated digital signals is disclosed that provides a signal quality voltage having a magnitude that is indicative of the degree of quality of the detected delta modulated digital signal. The detector totalizes the number of bit transitions occurring in successive N bit intervals. If successive totalized numbers of bit transitions are outside of a predetermined range centered about one-half of N, the detector provides a detect indication signal indicating that the delta modulated digital signal is present. Otherwise, a random or pseudorandom signal such as noise or error bursts may be present. Digital circuitry provides the detect indication signal with a logical high state when successive totalized numbers of bit transitions are outside of the predetermined range, and a logical low state when succesive totalized numbers of bit transitions are within the predetermined range. The detect indication signal may be further integrated and amplified to provide a signal quality voltage which has a magnitude indicative of the quality or signal to noise ratio of the detected delta modulated digital signal. The signal quality voltage may be advantageously utilized in a receiver voting system having a plurality of receivers for selecting the receiver having the highest quality signal.
REFERENCES:
patent: 3852671 (1974-12-01), Risley
patent: 3902123 (1975-08-01), Oomen
patent: 3925732 (1975-12-01), Tanaka et al.
patent: 4087753 (1978-05-01), Paul
B. G. Taylor, "Signal Detection of Delta-Coded Speech", Proceedings of the IEE, vol. 123, No. 8, Aug. 1976, pp. 752-755.
Backof, Jr. Charles A.
Wilson Alan L.
Gillman James W.
Grimm Siegfried H.
Hackbart Rolland R.
Motorola Inc.
Westin Edward P.
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