Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-09-20
1984-11-27
Rubinson, Gene Z.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455 53, 455102, 455116, 179 7R, H04Q 704, H04M 1500
Patent
active
044852703
ABSTRACT:
In a system for transmitting a charging signal from an exchange to a telephone system together with a voice signal, radio equipment in the exchange side detects the charging signal sent from the exchange and encodes it into a pulse code signal comprising a plurality of continuous pulses. Thereafter, this pulse signal is modulated into a frequency signal outside the voice transmitting frequency band and then transmitted as a radio signal after it is superimposed on the voice signal. Radio equipment on the telephone side detects this charging signal carrier and demodulates it into the pulse code signal, then counts it and transfers the charging signal when the counted value reaches a specified value. In addition, the radio equipment in the exchange side previously executes a deep amplitude limitation only for the voice signal onto which the out-of-band frequency signal is superimposed, and, thereby, the charging signal superimposed is protected from degradation due to amplitude limitation by a limiter circuit provided in a stage preceding a modulator.
REFERENCES:
patent: 3513264 (1970-05-01), Baer
Honda Isao
Shimizu Takafumi
Brady W. J.
Fujitsu Limited
Rubinson Gene Z.
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