Patent
1976-04-19
1977-12-13
Claffy, Kathleen H.
179 1SD, 325304, H04B 106, H04K 520
Patent
active
040630315
ABSTRACT:
An apparatus for signal-in-noise enhancement by useful-channel selection, includes automatic channel switching if words of a predetermined speech vocabulary are not detected within a predetermined interval. In accordance with the invention there are provided first and second parallel channels to which audio signals are applied. A channel selector, such as a voltage controlled switch, is responsive to a control signal for selecting the first or the second channel. A speech word recognition subsystem is provided and is responsive to the audio signals transmitted over the selected channel. The speech recognition subsystem determines the presence of speech-like sounds and generates a speech-indicative signal as a function thereof. Portions of the audio signals which occur during the speech-indicative signal are compared with the predetermined vocabulary to determine the probable occurrence of a word from among the predetermined vocabulary, and an occurrence indication signal is generated when a vocabulary word is detected. A control signal is generated in response to the output of the speech word recognition subsystem, the control signal being a function of the speech-indicative signal and the occurrence indication signal. In operation, the control signal is operative, in response to the presence of extraneous signals on a channel being utilized, to effect switching to the other channel. In the preferred embodiment, the speech recognition subsystem generates reject signals when the speech-indicative signal persists for a prescribed time without an occurrence indication occurring, and the control signal is generated in response to the reject signals.
REFERENCES:
patent: 3495175 (1970-02-01), Munch
patent: 3577087 (1971-05-01), Martin
patent: 3588363 (1971-06-01), Herscher
patent: 3745467 (1973-07-01), Lundquist et al.
patent: 3860872 (1975-01-01), Richardson
patent: 3902123 (1975-08-01), Ooman
Claffy Kathleen H.
Kemeny E. S.
Novack Martin
Threshold Technology Inc.
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