Analog audio signal bandwidth compressor

Details Analog audio signal bandwidth compressor Analog audio signal bandwidth compressor

1977-12-23

1978-12-19

Claffy, Kathleen H.

179 1SA, H04J 318, G10L 100

Patent

active

041307348

ABSTRACT:
The analog bandwidth compressor of the present system preserves the actual frequencies of the detected signal. This is accomplished by feeding the detected signal to a bank of contiguous filters and feeding the outputs of each of these filters to an AM detector and a frequency divider. The output from each frequency divider is fed to a tunable filter bank. The outputs of the tunable filter bank are fed to multipliers where the outputs from the associated AM detectors are superimposed on the frequency signals from the tunable filter bank. The output of the plurality of multipliers is fed to a summing network which provides a reduced bandwidth signal. The output of the summing network is subsequently fed through a transmission system to a bandwidth restoration circuit which consists of a tunable contiguous filter bank, AM detector, frequency multiplier, tunable filter bank, multipliers and a summer similar to the bandwidth reduction circuit.

REFERENCES:
patent: 3102929 (1963-09-01), De Jager et al.
patent: 3499991 (1970-03-01), Cassel et al.

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