US3296373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sound volume controller
Assignee: TDK Corp
•
Filing: 1963-04-19
•
Granted: 1967-01-03
•
Expires: 1983-04-19
Abstract
No abstract record available.
Inventors
- 👤 Suganuma Fujio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:12
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
AN AUTOMATIC SOUND VOLUME CONTROLLER COMPRISING TWO PHOTOCONDUCTORS CONNECTED IN SERIES TO INPUT TERMINALS, A DISK DISPOSED IN FRONT OF SAID PHOTOCONDUCTORS AND HAVING WINDOWS OF ANY DESIRED SHAPES SO AS TO VARY THE AMOUNTS OF LIGHT INCIDENT UPON THE PHOTOCONDUCTORS WHEN ROTATED, A DUAL COIL METER TO ROTATE SAID DISK, A CONDENSER TO WHICH IS APPLIED AN OUTPUT OBTAINED BY FULL-WAVE-RECTIFYING A SIGNAL OBTAINED FROM ANY POINT IN THE LINE LEADING FROM THE CONNECTING POINT OF SAID TWO PHOTOCONDUCTORS TO A LOUD SPEAKER AND A CONDENSER TO WHICH IS APPLIED AN OUTPUT OBTAINED BY FULL-WAVE-RECTIFYING A SIGNAL FROM A MICROPHONE COLLECTING THE BACKGROUND SOUND, THE OUTPUTS FROM SAID TWO CONDENSERS BEING FED TO THE RESPECTIVE COILS OF SAID DUAL COIL METER AND THE OUTPUT OF THE SPEAKER BEING CONTROLLED IN RESPONSE TO THE VARIATION OF THE NOISE BY VARYING THE RESISTANCE VALUES OF THE PHOTOCONDUCTORS WITH THE VARIATION OF THE AMOUNT OF LIGHT BY THE ROTATION OF SAID DISK SO THAT THE NOISE-SIGNAL RATIO MAY BE CONSTANT.
Claim 2
Dependent Claim
168 words
AN AUTOMATIC SOUND VOLUME CONTROLLER COMPRISING TWO PHOTOCONDUCTORS CONNECTED IN SERIES TO INPUT TERMINALS, A DISK DISPOSED IN FRONT OF SAID PHOTOCONDUCTORS AND HAVING WINDOWS OF ANY DESIRED SHAPES SO AS TO VARY THE AMOUNTS OF LIGHT INCIDENT UPON THE PHOTOCONDUCTORS WHEN ROTATED, A DUAL COIL METER TO ROTATE SAID DISK, A CONDENSER TO WHICH IS APPLIED AN OUTPUT OBTAINED BY FULL-WAVE-RECTIFYING A SIGNAL OBTAINED FROM ANY POINT IN THE LINE LEADING FROM THE CONNECTING POINT OF SAID TWO PHOTOCONDUCTORS TO A LOUD SPEAKER AND A CONDENSER TO WHICH IS APPLIED AN OUTPUT OBTAINED BY FULL-WAVE-RECTIFYING A SIGNAL FROM A MICROPHONE COLLECTING THE BACKGROUND SOUND, THE OUTPUTS FROM SAID TWO CONDENSERS BEING FED TO THE RESPECTIVE COILS OF SAID DUAL COIL METER AND THE OUTPUT OF THE SPEAKER BEING CONTROLLED IN RESPONSE TO THE VARIATION OF THE NOISE BY VARYING THE RESISTANCE VALUES OF THE PHOTOCONDUCTORS WITH THE VARIATION OF THE AMOUNT OF LIGHT BY THE ROTATION OF SAID DISK SO THAT THE NOISE-SIGNAL RATIO MAY BE CONSTANT.
References Cited (Backward Citations)
US1834405A
Cited
US2688874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |