Telegraphy – Systems – Printing
Patent
1977-07-15
1978-12-26
Heyman, John S.
Telegraphy
Systems
Printing
328 55, 328155, 178 691, 328140, H03B 304
Patent
active
041318544
ABSTRACT:
The invention relates to a novel switching circuit for regulating the repetition rate of clock pulses generated by a clock pulse generator. This repetition rate regulation of the clock pulses thereby controls the sampling instants at which a data signal is sampled. The best possible sampling interest is found by sampling at a first zero crossing of a distorted data pulse after its maximum value. The circuit of the invention generates a first signal which corresponds to the sign of the difference between the actual and the desired values of the data signal at the sampling instants; the circuit also generates a second signal which corresponds to the sign of the desired value of the data signal. A delay element delays the second signal by a period of the clock pulse. A multiplier circuit multiplies the first signal by the delayed second signal and produces an output control signal which regulates the repetition rate of the clock pulse generator.
REFERENCES:
patent: 3962541 (1976-06-01), Seidel
patent: 3980820 (1976-09-01), Niemi et al.
patent: 4034348 (1977-07-01), Rathbun
Heyman John S.
Siemens Aktiengesellschaft
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