Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-03-09
1983-07-12
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
370105, 375106, 375120, 455619, H04B 900
Patent
active
043935168
ABSTRACT:
A data transmission system and method is provided for transferring digital information which has been converted to a multiframe format of serial bits over a single optical cable. The mutliframe format used by the system includes sequential data frames each containing a sequence of bits at a bit frequency, of which a certain number are data bits containing the digital information. The data frames are transferred by way of the optical cable to a receiver. In the receiver a clock signal is generated by a variable oscillator which operates at a frequency substantially equal to the bit frequency. Circuitry responsive to the bits maintains a predetermined phase relationship between the clock signal from the oscillator and the bits. Decoder circuitry receives the transmitted bits and decodes the bits to retrieve the digital information using the clock signal from the oscillator. The method of retrieving the digital information from the above-described multiframe format, after having been transferred over the single optical cable, includes the following steps: A clock signal is generated having a frequency substantially equal to the bit frequency. A predetermined phase relationship is maintained between the clock signal and the bits. The clock signal is then used to select the data bits from the sequence of bits in the data frames and to retrieve the digital information from the data bits.
REFERENCES:
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patent: 3193801 (1965-07-01), Grondin
patent: 3697690 (1972-10-01), Aaron et al.
patent: 3758720 (1973-09-01), Dinn
patent: 4017683 (1977-04-01), Pederson et al.
patent: 4019048 (1977-04-01), Maione et al.
Houston--New Techniques for Current and Voltage Measurement on Power Transmission Lines--Publ. Gen. Elec. Co. May 1977 Rep. #77CRD111.
Electric Power Research Institute Inc.
Orsino Jr. Joseph A.
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