Synchronous detection with sampling

Details Synchronous detection with sampling Synchronous detection with sampling

1980-05-13

1981-02-24

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

455202, 455312, 455337, H03D 104, H03D 124

Patent

active

042530660

ABSTRACT:
In receiving apparatus for a double-sideband amplitude-modulated wave, a synchronous detector which samples the modulated wave for short periods centered on instants of peaks of the carrier at regularly-occurring intervals, with a sampling frequency greater than the Nyquist frequency for the modulating wave, equal to the carrier frequency divided by an integer, and reconstructs the modulating wave from the sequence of samples in a reconstruction filter. This detector has a high output signal-to-noise ratio and produces a distortionless output with positive or negative overmodulation, and with reduced or suppressed carrier.

REFERENCES:
patent: 2194292 (1940-03-01), Bligh et al.
patent: 2778933 (1957-01-01), Crist
patent: 2780807 (1957-02-01), Frank
patent: 3430151 (1969-02-01), Badessa
patent: 4178553 (1979-12-01), Fisher et al.
patent: 4182932 (1980-01-01), Fisher et al.
Reference Data for Radio Engineers, Howard W. Sams, 1969, pp. 21-4, 21-5, 21-13, 21-14.
Transmission Systems for Communications, Bell Telephone Laboratories, 4th Edition, pp. 103, 104.
Weiss, "Heart-Sound Discriminator Simplifies Medical Diagnosis", Electronics 34:24, pp. 52-55.
Prigozy, "Zero-Crossing Detector Provides Fast Sync Pulses", Electronics, Apr. 19, 1965, p. 91.
Ferrara, "Delayed Pulse Generator", EEE, 13:10, p. 71.

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