Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1974-08-19
1976-08-24
Safourek, Benedict V.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
325329, 325349, 329122, 329132, H03D 302
Patent
active
039769437
ABSTRACT:
A received radio signal is demodulated by applying it to a coherent demodulator loop for detection of a modulated input signal. The loop has a variable gain control capability. A gain control voltage dependent upon variations of amplitude of the input signal is then generated and is applied to control the gain within the loop.
In one aspect, a received radio signal is demodulated by multiplying the signal with a local oscillator signal to produce two product voltages the first of which reflects exponential (EM frequency or phase) variations and may reflect amplitude variations in said radio signal and the second of which reflects only amplitude variations. The amplitude of the first product voltage is modified in dependence upon amplitude variations in the second product voltage whereby the modified first product voltage is an audio output voltage representative exclusively of exponential modulation of the radio signal and the second product voltage is an audio output voltage representative of amplitude modulation of the radio signal.
REFERENCES:
patent: 3800226 (1974-03-01), Close
patent: 3829778 (1974-08-01), Amaroso
patent: 3864635 (1975-02-01), Ewanus
Exar Integrated Systems Inc., Monolithic Phase-Locked Loop, pp. 1-8, 1972.
Cipher John A.
Lorang Malcolm M.
Comfort James T.
Dixon James O.
Levine Harold
Safourek Benedict V.
Texas Instruments Incorporated
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