Noise-reducing apparatus

Details Noise-reducing apparatus Noise-reducing apparatus

Filed on

1978-07-27

Date issued

1981-02-03

Examiner

Olms, Douglas W.

Patent Class

Telecommunications

SubClass

Receiver or analog modulated signal frequency converter

SubSubClass

Noise or interference elimination

Other Related Categories

455312, H04B 112

Type

Patent

Status

active

Patent number

042492602

Description

ABSTRACT:
This invention provides improvements of noise-reducing apparatus for a signal with superimposed noise. The improvement comprises means for double sampling of a signal with the instants of zero-crossings known or ascertainable at the receiving apparatus and with superimposed noise each sampling carried out at intervals not greater than the Nyquist interval for the signal, to produce two interlaced sequences of samples, reconstructing the signal plus superimposed noise from the first sequence of samples, taken at instants near peaks of the signal, reconstructing the superimposed noise only from the second sequence of samples, taken at instants of zero-crossings of the signal, and subtracting the reconstructed superimposed noise from the reconstructed signal plus superimposed noise, to produce the signal substantially free from the superimposed noise.

REFERENCES:
patent: 2194292 (1940-03-01), Bligh et al.
patent: 2471427 (1949-05-01), Grieg
patent: 2780807 (1957-02-01), Frank
patent: 3611145 (1971-10-01), O'Connor
patent: 4081837 (1978-03-01), Tada et al.
patent: 4104594 (1978-08-01), Cann
patent: 4130805 (1978-12-01), Mori et al.
"Heart-Sound Discriminator" in Sourcebook of Electronic Circuits, New York, 1968, p. 278, R. Weiss.
"Zero-Crossing Detector Provides Fast Sync Pulses" Electronics, Apr. 19, 1965, p. 91, Prigozy.
Ferrara, "Delayed Output Pulse Generator" EEE 13:10, p. 71.
"Comments on Notice of Proposed Rule Making" released by FCC on 10-19-78, by F. T. Fisher's Sons Ltd.

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