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US4063031A
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System for channel switching based on speech word versus noise detection
Assignee: Siemens Corporate Research and Support Inc
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Filing: 1976-04-19
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Granted: 1977-12-13
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Expires: 1996-04-19
Abstract
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.
Inventors
- 👤 Gene Grunza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0814
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
182 words
Apparatus for transmitting and receiving audio signals including recognizable speech information of a predetermined restricted vocabulary, comprising: a. first and second parallel channels; b. means for applying said audio signals to said first and second channels; c. channel selecting means responsive to a control signal for selecting said first or second channel; d. a speech recognition subsystem responsive to the audio signals transmitted over the selected channel, said speech recognition subsystem including means for determining the presence of speech-like sounds and for generating a speech-indicative signal as a function thereof, and means responsive to said speech-indicative signal for comparing portions of said audio signals with said predetermined vocabulary to determine the probable occurrence of a word from among said predetermined vocabulary and for thereupon generating an occurrence indication signal; and e. control means coupled to said speech recognition subsystem for generating said control signal as a function of said speech-indicative signal and said occurrence indication signal; whereby said control signal is operative, in response to the presence of extraneous signals on a channel being utilized, to effect switching to the other channel.
Claim 2
Dependent Claim
182 words
Apparatus for transmitting and receiving audio signals including recognizable speech information of a predetermined restricted vocabulary, comprising: a. first and second parallel channels; b. means for applying said audio signals to said first and second channels; c. channel selecting means responsive to a control signal for selecting said first or second channel; d. a speech recognition subsystem responsive to the audio signals transmitted over the selected channel, said speech recognition subsystem including means for determining the presence of speech-like sounds and for generating a speech-indicative signal as a function thereof, and means responsive to said speech-indicative signal for comparing portions of said audio signals with said predetermined vocabulary to determine the probable occurrence of a word from among said predetermined vocabulary and for thereupon generating an occurrence indication signal; and e. control means coupled to said speech recognition subsystem for generating said control signal as a function of said speech-indicative signal and said occurrence indication signal; whereby said control signal is operative, in response to the presence of extraneous signals on a channel being utilized, to effect switching to the other channel.
Claim 3
Dependent Claim
46 words
Apparatus as defined by claim 1 wherein said speech recognition subsystem generates reject signals when said speech-indicative signal persists for a prescribed time without an occurrence indication occurring, and wherein said control means is operative in response to said reject signals for generating said control signal.
Claim 4
Dependent Claim
44 words
Apparatus as defined by claim 1 wherein said speech recognition system generates reject signals when said speech-indicative signals persist for a prescribed time without an occurrence indication occurring, and wherein said control means is responsive to said reject signal and said occurrence indication signal.
Claim 5
Dependent Claim
27 words
Apparatus as defined by claim 2 wherein said control means is operative in response to the occurrence of a predetermined number of reject signals per unit time.
Claim 6
Dependent Claim
25 words
Apparatus as defined by claim 3 wherein said control signal is operative in response to the occurrence of more than one reject signal in succession.
Claim 7
Dependent Claim
36 words
Apparatus as defined by claim 4 wherein said control means is responsive to the occurrence of two reject signals in succession or the occurrence of more than a predetermined number of reject signals per unit time.
Claim 8
Dependent Claim
181 words
Apparatus for transmitting and receiving audio signals including recognizable speech information of a predetermined restricted vocabulary, comprising: a. first and second parallel channels; b. means for applying said audio signals to said first and second channels; c. chanel selecting means responsive to a control signal for selecting said first or second channel; d. a speech recognition subsystem responsive to the audio signals transmitted over the selected channel, said speech recognition subsystem including means for determining the presence of speech-like sounds and for comparing portions of said audio signals which occur during said speechlike sounds with said predetermined vocabulary to determine the probable occurrence of a word from among said predetermined vocabulary, said subsystem generating reject signals when the comparisons do not indicate the probable occurrence of a word from among said predetermined vocabulary; and e. control means coupled to said speech recognition subsystem for generating said control signal as a function of said reject signals; whereby said control signal is operative, in response to the presence of extraneous signals on a channel being utilized, to effect switching to the other channel.
Claim 9
Dependent Claim
181 words
Apparatus for transmitting and receiving audio signals including recognizable speech information of a predetermined restricted vocabulary, comprising: a. first and second parallel channels; b. means for applying said audio signals to said first and second channels; c. chanel selecting means responsive to a control signal for selecting said first or second channel; d. a speech recognition subsystem responsive to the audio signals transmitted over the selected channel, said speech recognition subsystem including means for determining the presence of speech-like sounds and for comparing portions of said audio signals which occur during said speechlike sounds with said predetermined vocabulary to determine the probable occurrence of a word from among said predetermined vocabulary, said subsystem generating reject signals when the comparisons do not indicate the probable occurrence of a word from among said predetermined vocabulary; and e. control means coupled to said speech recognition subsystem for generating said control signal as a function of said reject signals; whereby said control signal is operative, in response to the presence of extraneous signals on a channel being utilized, to effect switching to the other channel.
Claim 10
Dependent Claim
23 words
Apparatus as defined by claim 7 wherein said control means is responsive to the occurrence of more than one reject signal in succession.
Claim 11
Dependent Claim
27 words
Apparatus as defined by claim 7 wherein said control means is responsive to the occurrence of more than a predetermined number of reject signals per unit time.
Claim 12
Dependent Claim
36 words
Apparatus as defined by claim 7 wherein said control means is responsive to the occurrence of two reject signals in succession or the occurrence of more than a predetermined number of reject signals per unit time.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |