Circuit for preventing errors in decoding information from disto

Details Circuit for preventing errors in decoding information from disto Circuit for preventing errors in decoding information from disto

1976-02-05

1977-03-22

Sloyan, Thomas J.

Telegraphy

Systems

Printing

178 66R, 178 88, H04L 2710

Patent

active

040139654

ABSTRACT:
A converter for converting radio teleprinter audio frequency signals from a radio receiver into teleprinter signals which are bipolar pulses for operating an output device. The converter includes a binary pulse decoder, which may be used independently in other applications, and a pair of substantially identical demodulator channels.
In radio teleprinter applications the novel decoder is coupled to two substantially identical demodulator chanels which demodulate pulses from incoming information signals at audio frequencies. In the demodulator channels the frequencies of the information signals, which commonly are received by the demodulator channels on different audio frequencies, are shifted to the same audio frequency by mixing them with a signal from a respective local oscillator in each demodulator channel. The demodulator channels each detect a series of DC pulses from the audio signals and apply the DC pulses to the decoder.

REFERENCES:
patent: 2715677 (1955-08-01), Turner
patent: 2882338 (1959-04-01), Wozencraft
patent: 2961642 (1960-11-01), Lamb
patent: 3348153 (1967-10-01), Featherston
patent: 3383600 (1968-05-01), Calfee
patent: 3422357 (1969-01-01), Browne
patent: 3541354 (1970-11-01), Basham
patent: 3603820 (1971-09-01), Schuenemann
patent: 3710140 (1973-01-01), Volmerage
patent: 3863229 (1975-01-01), Gersbach
Byers, Fast Monostable Multivibrators Using e.c.l. Gates, Electron, Great Britain, No. 9, 7/72.

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