US3919481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phonetic sound recognizer
Assignee: Individual
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Filing: 1975-01-03
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Granted: 1975-11-11
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Expires: 1995-01-03
Abstract
Abstract Identification of complex signals such as a phonetic sound in speech is accomplished by the combination of ratio values both between the amplitudes and frequencies of the resonances in the complex sound wave. The amplitude ratio between the signals detected from two resonances (e.g. formants) is derived as a null signal when they match a pair of signal-gain preadjustments during a given time period. This null-signal is also obtained when both input signals are absent during that time period. In order to avoid false null-signal indication, a sensing signal is derived from said input signals to indicate that the null-signal is not false.
Inventors
- 👤 Meguer V Kalfaian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:51
CPC Classifications
G; G10; G10L; G10L15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A signal matching system for deriving an informationrepresenting signal from the signal-amplitude-ratio between first and second signals when said ratio matches with an arrangement of prefixed signal-amplitude-ratio adjustments in first and second channels during a predetermined time period in which a control signal is produced, said system comprising means for producing said control signal; first and second channels; coupling means from said first and second signals to said first and second channels, said channels having prefixed signal-amplitude-gain adjustments, so that the signal-amplitudes of said first and second signals are equalized at the outputs of said first and second channels in the form of a null signal only when the signal-amplitude-ratio between said first and second signals matches with said prefixed adjustments; a signal sensing means for deriving a sensing signal from said first and second signals; and means for deriving a discrete signal representing said information from the combination of said null-signal, said control-signal, and said sensing-signal, last said signal making sure that said null-signal is derived only from the presence of said first and second signals, and not from their absence in said channels.
Claim 2
Dependent Claim
185 words
A signal matching system for deriving an informationrepresenting signal from the signal-amplitude-ratio between first and second signals when said ratio matches with an arrangement of prefixed signal-amplitude-ratio adjustments in first and second channels during a predetermined time period in which a control signal is produced, said system comprising means for producing said control signal; first and second channels; coupling means from said first and second signals to said first and second channels, said channels having prefixed signal-amplitude-gain adjustments, so that the signal-amplitudes of said first and second signals are equalized at the outputs of said first and second channels in the form of a null signal only when the signal-amplitude-ratio between said first and second signals matches with said prefixed adjustments; a signal sensing means for deriving a sensing signal from said first and second signals; and means for deriving a discrete signal representing said information from the combination of said null-signal, said control-signal, and said sensing-signal, last said signal making sure that said null-signal is derived only from the presence of said first and second signals, and not from their absence in said channels.
Claim 3
Dependent Claim
26 words
The system as set forth in claim 1, wherein said first and second channels consist of an operational amplifier for producing said nulL-signal at its output.
Claim 4
Dependent Claim
45 words
The system as set forth in claim 1, wherein is included means for translating said null-signal, said control-signal, and said sensing signal into similar-polarity signals; a multi-input gate; and means for applying said similar-polarity signals to the inputs said gate for obtaining said discrete signal.
Claim 5
Dependent Claim
36 words
The system as set forth in claim 1, wherein is included coupling means from said discrete signal to said means for producing said control-signal for resetting them to normal states after said discrete signal is used.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |