US3746789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tissue conduction microphone utilized to activate a voice operated switch
Assignee: Individual
•
Filing: 1971-10-20
•
Granted: 1973-07-17
•
Expires: 1991-10-20
Abstract
Abstract A voice-activated transmit switch (VOX) for high noise environment voice communication systems which employ a speech microphone, a transmitter and a receiver. A separate tissueconduction microphone is employed to generate a signal which activates a transmitter enabling and receiver disabling circuit. The tissue-conduction microphone is positioned in contact with the user''s neck tissue in the vicinity of the larynx. A bandpass filter eliminates the unwanted signal from the tissue-conduction microphone output and passes the desired speech signals to an amplifier. The amplifier output actuates a Schmitt trigger which in turn operates a transmitter enable-receiver disable switching circuit. Delay means are provided so that the transmitter does not turn off during brief intersyllabic pauses.
Inventors
- 👤 E Alcivar
- 👤 D Johnson
- 👤 Carthy B Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:08
CPC Classifications
G; G10; G10L; G10L25/00; G10L25/78
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
59 words
In a voice communication system having a transmitter, a receiver, and a speech microphone acoustically coupled through a gaseous medium to a speech source signal for generating a modulation signal for said transmitter, a voice actuated transmit switch comprising: 1. a separate tissue-conduction microphone; and, 2. means responsive to an output signal from said microphone for enabling said transmitter.
Claim 2
Dependent Claim
59 words
In a voice communication system having a transmitter, a receiver, and a speech microphone acoustically coupled through a gaseous medium to a speech source signal for generating a modulation signal for said transmitter, a voice actuated transmit switch comprising: 1. a separate tissue-conduction microphone; and, 2. means responsive to an output signal from said microphone for enabling said transmitter.
Claim 3
Dependent Claim
14 words
The transmit switch of claim 1 wherein said tissue-conduction microphone is a throat microphone.
Claim 4
Dependent Claim
13 words
means responsive to an output signal from said microphone for enabling said transmitter.
Claim 5
Dependent Claim
13 words
means responsive to an output signal from said microphone for enabling said transmitter.
Claim 6
Dependent Claim
8 words
bandpass filter means coupled to said throat microphone;
Claim 7
Dependent Claim
8 words
bandpass filter means coupled to said throat microphone;
Claim 8
Dependent Claim
9 words
means for acoustically isolating said microphone from waterborne noises;
Claim 9
Dependent Claim
9 words
means for acoustically isolating said microphone from waterborne noises;
Claim 10
Dependent Claim
7 words
bandpass filter means coupled to said microphone;
Claim 11
Dependent Claim
7 words
bandpass filter means coupled to said microphone;
Claim 12
Dependent Claim
11 words
amplifier means coupled to the output of said bandpass filter means;
Claim 13
Dependent Claim
11 words
amplifier means coupled to the output of said bandpass filter means;
Claim 14
Dependent Claim
14 words
The transmit switch of claim 1 wherein said tissue-conduction microphone is a chest microphone.
Claim 15
Dependent Claim
14 words
The transmit switch of claim 1 further characterized by means for disabling said receiver.
Claim 16
Dependent Claim
17 words
trigger means responsive to an output signal from said amplifier means for generating a trigger signal; and,
Claim 17
Dependent Claim
17 words
trigger means responsive to an output signal from said amplifier means for generating a trigger signal; and,
Claim 18
Dependent Claim
11 words
amplifier means coupled to the output of said bandpass filter means;
Claim 19
Dependent Claim
11 words
amplifier means coupled to the output of said bandpass filter means;
Claim 20
Dependent Claim
17 words
trigger means responsive to an output signal from said amPlifier means for generating a trigger signal; and,
Claim 21
Dependent Claim
17 words
trigger means responsive to an output signal from said amPlifier means for generating a trigger signal; and,
Claim 22
Dependent Claim
10 words
means responsive to said trigger signal for enabling said transmitter.
Claim 23
Dependent Claim
10 words
means responsive to said trigger signal for enabling said transmitter.
Claim 24
Dependent Claim
37 words
In a voice communication system having a transmitter, a receiver, and a speech microphone acoustically coupled through a gaseous medium to a speech source for generating a modulation signal for said transmitter, a voice-activated transmit switch comprising:
Claim 25
Dependent Claim
37 words
In a voice communication system having a transmitter, a receiver, and a speech microphone acoustically coupled through a gaseous medium to a speech source for generating a modulation signal for said transmitter, a voice-activated transmit switch comprising:
Claim 26
Dependent Claim
28 words
The voice-activated transmit switch of claim 5 wherein said bandpass filter means has a center frequency slightly below 1 khz and a passband of 40 to 100 hz.
Claim 27
Dependent Claim
10 words
means responsive to said trigger signal for enabling said transmitter.
Claim 28
Dependent Claim
10 words
means responsive to said trigger signal for enabling said transmitter.
Claim 29
Dependent Claim
38 words
The voice-activated transmit switch of claim 5 wherein said trigger means includes delay means for maintaining said trigger signal for a predetermined length of time after the termination of the amplified vocal sound output from said amplifier means.
Claim 30
Dependent Claim
17 words
The voice-activated transmit switch of claim 7 wherein said predetermined length of time is approximately 0.2 seconds.
Claim 31
Dependent Claim
35 words
The voice-activated transmit switch of claim 5 wherein said means responsive to the trigger signal for enabling the transmitter is actuated within approximately 1 millisecond after reception of a vocal sound by said tissue-conduction microphone.
Claim 32
Dependent Claim
14 words
The transmit switch of claim 5 further characterized by means for disabling said receiver.
Claim 33
Dependent Claim
51 words
In an underwater voice communication system having a transmitter, a receiver, and a speech microphone for generating a modulation signal for the transmitter, said speech microphone being positioned in an acoustic cavity in front of the user''s mouth and acoustically coupled thereto through a gaseous medium, a voice-actuated transmit switch comprising:
Claim 34
Dependent Claim
51 words
In an underwater voice communication system having a transmitter, a receiver, and a speech microphone for generating a modulation signal for the transmitter, said speech microphone being positioned in an acoustic cavity in front of the user''s mouth and acoustically coupled thereto through a gaseous medium, a voice-actuated transmit switch comprising:
Claim 35
Dependent Claim
14 words
The transmit switch of claim 11 wherein said tissue-conduction microphone is a throat microphone.
Claim 36
Dependent Claim
14 words
The transmit switch of claim 11 further characterized by means for disabling said receiver.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |