US3328526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speech privacy system
Assignee: AT&T Inc
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Filing: 1963-12-20
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Granted: 1967-06-27
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Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Manfred R Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
H; H04; H04K; H04K1/00; G; G10; G10L; G10L21/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
A SPEECH PRIVACY SYSTEM THAT COMPRISES A TRANSMITTER STATION INCLUDING MEANS FOR CONVERTIG HUMAN SPEECH SOUNDS INTO AN INCOMING SPEECH WAVE CHARACTERIZED BY A PLURALITY OF FREQUENCY COMPONENTS, EACH OF SAID FREQUENCY COMPONENTS HAVING A CERTAIN AMPLITUDE AND A CERTAIN PHASE ANGLE DETERMINED BY THE NATURE OF SAID SPEECH SOUNDS AT A GIVEN INSTANT, MEANS FOR DERIVING FROM SAID SPEECH WAVE A PAIR OF FIRST AND SECOND CODED SIGNALS, WHEREIN EACH OF SAID CODED SIGNALS IS CHARACTERIZED BY A PLURALITY OF UNIFORM AMPLITUDE FREQUENCY COMPONENTS IN ONE-TO-ONE CORRESPONDENCE WITH EACH OTHER AND WITH SAID FREQUENCY COMPONENTS OF SAID SPEECH WAVE, AND WHEREIN THE DIFFERENCE IN PHASE ANGLE BETWEEN EACH OF SAID FREQUENCY COMPONENTS OF SAID FIRST AND SECOND CODED SIGNALS AND SAID CORRESPONDING FREQUENCY COMPONENT OF SAID SPEECH WAVE IS PROPORTIONAL TO THE AMPLITUDE OF SAID CORRESPONDING FREQUENCY COMPONENT OF SAID SPEECH WAVE,
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |