System for channel switching based on speech word versus noise detection
US4063031A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Apr 19, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0814
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.