Patent US693400A successfully refreshed from Google Patents.
Patent US3836714A successfully refreshed from Google Patents.
US3836714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital voice detector
Assignee: United States Department of the Navy
•
Filing: 1973-08-24
•
Granted: 1974-09-17
•
Expires: 1993-08-24
Abstract
Abstract Digital apparatus for detecting the presence of voice in a vocoder output signal to produce a push-to-talk (PTT) signal for simplex operation of communication apparatus. When voice is detected by shift register and logic detection apparatus, a signal is generated that sets a hold circuit which supplies a PTT output for generation of an isolated key signal. The hold circuit is reset each time that voice is detected in the vocoder signal; therefore, PTT is maintained until there are no voice signals present during a complete hold period which is switch-selectable. A sampling signal for voice detection and a synchronization signal are supplied to the voice detection circuit by interface circuitry.
Inventors
- 👤 W Pomper
- 👤 C Wilhelm
- 👤 L Yancey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:38
CPC Classifications
G; G10; G10L; G10L25/00; G10L25/78; H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
Digital voice detection apparatus comprising: first input means for receiving incoming clear text vocoder data and receive clock signals; data storage means for accepting said vocoder data in response to said clock signals; sampling means connected to the output of said data storage means and comprising pitch and spectrum channels; second input terminal means for receiving sample signals in synchronism with said vocoder data and being connected to said sampling means whereby the accepted data in said data storage means is sampled by said sampling means in response thereto; said sampling means being responsive to said sampled data to produce a pulse output indicating the presence of voice only when selectively predetermined binary numbers corresponding to energy are detected in said pitch and spectrum channels simultaneously.
Claim 2
Dependent Claim
126 words
Digital voice detection apparatus comprising: first input means for receiving incoming clear text vocoder data and receive clock signals; data storage means for accepting said vocoder data in response to said clock signals; sampling means connected to the output of said data storage means and comprising pitch and spectrum channels; second input terminal means for receiving sample signals in synchronism with said vocoder data and being connected to said sampling means whereby the accepted data in said data storage means is sampled by said sampling means in response thereto; said sampling means being responsive to said sampled data to produce a pulse output indicating the presence of voice only when selectively predetermined binary numbers corresponding to energy are detected in said pitch and spectrum channels simultaneously.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 further including delay circuit means connected to the output of said sampling means for maintaining said pulse output a selectively predetermined time period.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1 wherein said data storage means comprises a multi-stage shift register.
Claim 5
Dependent Claim
16 words
The apparatus of claim 3 wherein said sampling means comprises a pair of serially connected NAND-gates.
Claim 6
Dependent Claim
28 words
The apparatus of claim 2 wherein said delay circuit means comprise a multivibrator connected at its output to a pair of decade counters which feed a flip-flop circuit.
References Cited (Backward Citations)
US3566280A
Cited
US3760354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |