Delay line time compressor and expander

Details Delay line time compressor and expander Delay line time compressor and expander

1975-04-15

1976-05-25

Claffy, Kathleen H.

H04B 166

Patent

active

039595978

ABSTRACT:
This invention relates to an improved system for changing the bandwidth of an intelligence-bearing electrical signal so that it can be transmitted within said changed bandwidth and to a counterpart system for changing the bandwidth, following transmission, so that a good replica of the original signal is obtained at a receiving terminal. The bandwidth compression and expansion are obtained through time-delay expansion and compression. This invention uses the fact that the time delay characteristics of a charge-coupled device is a function of the clocking frequency. The desired time delay variation can be achieved by varying this clocking frequency correspondingly. A single delay line, with a sawtooth variation of clock frequency, is a feature of the invention.

REFERENCES:
patent: 3763328 (1973-10-01), Lester
patent: 3838218 (1974-09-01), Pfund
patent: 3846827 (1974-11-01), Eppler
patent: 3855425 (1974-12-01), Kerser

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