Patent
1975-03-11
1977-08-23
Claffy, Kathleen H.
325 65, H03G 100
Patent
active
040442055
ABSTRACT:
The reception technique for improving intelligibility of an audio frequency signal containing interference and wanted speech signals by selecting a narrow section of the frequency band of the audio frequency signal in which the interference is the least, and filtering out this section from the rest of the band. A control signal is then derived by utilizing the changing value of the mean amplitude of the filtered section, to amplitude modulate the interference, thereby eliminating noise between speech syllables. One embodiment involves deriving a control voltage proportional to the True-Signal Voltage, such that compressor-gain increases when there is only noise-signal at the input, (i.e., Zero True-Signal and thus Zero Control Voltage), which in turn over-drives a limiter to clip the input noise - signal.
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Claffy Kathleen H.
Kemeny E. S.
The Cunard Steam-Ship Company Limited
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