Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1984-02-01
1986-12-30
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
375 23, 375 89, 455615, 455617, H04B 900
Patent
active
046335234
ABSTRACT:
A communications circuit for optically transmitting analog data signals free of excessive ripple, while having rapid response time. The invention is further characterized by being adapted to provide an immediate indication of the failure of the optical transmission link of the circuit. Commercially available voltage to frequency converter chips are used in conjunction with suitable wiring arrays and in combination with readily available indicator means for constructing the communication circuit of the invention. A V/F converter in the communications circuit is coupled to an offset adjustment means to cause the converter to continuously produce a string of output voltage pulses having a frequency of about 1 Khz responsive to the input analog signal to the converter being zero. The continuous presence of the 1 Khz frequency on the optical transmission link is monitored at the receiving end of the communication circuit and the indicator means is connected to immediately provide an easily detected indication of a failure of the optical transmission link to transmit the 1 Khz frequency pulses.
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patent: 4388732 (1983-06-01), Hansel
patent: 4399564 (1983-08-01), Cowen
patent: 4502937 (1985-03-01), Yagi
Grimes-A High Resolution Analog Fiber Optics-Proc. of SPIE, vol. 95, Modern Util. of Ir. Tech II, 1976, pp. 178-187.
Brown et al-"System and Circuit"-IEEE Trans. on Comm., vol. COM 26, No. 7, Jul. 1978, pp. 976-982.
"Fiberoptic Transmitter"-Published by Burr Brown Res. Corp., Tuscon, Ariz., Jun. 1982.
Mims-"V/F Converters"-Popular Electronics-Oct. 1979, pp. 97-99.
Mims-"F/V Converters"-Popular Electronics-Nov. 1979, pp. 93, 94, 96.
Gottlieb Paul A.
Hightower Judson R.
Myles Vale P.
Orsino Jr. Joseph A.
The United States of America as represented by the United States
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