US3735047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for indicating a balanced listening position for 4-channel stereophonic systems
Assignee: Panasonic Holdings Corp
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Filing: 1971-09-23
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Granted: 1973-05-22
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Expires: 1991-09-23
Abstract
Abstract A means for indicating a balanced listening position for fourchannel stereophonic systems comprising a position indicating mechanism adapted to be controlled in association with the manipulation of variable resistors for the adjustment of relative output levels between forward and backward speakers and between left and right speakers of a four speaker system to thereby indicate the position of balance of sounds from the four speakers.
Inventors
- 👤 T Kawada
- 👤 T Torama
- 👤 T Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:48
CPC Classifications
H; H04; H04S; H04S7/00; H04S7/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
261 words
In a four-channel stereophonic system having first, second, third and fourth amplifying means for driving first, second, third and fourth speaker systems respectively; an indicating device comprising: first, second, third and fourth variable resistors each having first and second stationary terminals and one movable terminal, the first and second stationary terminals of said first variable resistor being connected to the respective signal transmitting lines in said first and second amplifying means, the first and second stationary terminals of said second variable resistor being connected to the respective signal transmitting lines in said third and fourth amplifying means, the first and second stationary terminals of said third variable resistor being connected to the respective signal transmitting lines in said first and third amplifying means, the first and second stationary terminals of said fourth variable resistor being connected to the signal transmitting lines in said second and fourth amplifying means, the respective moving terminals of said first, second, third and fourth variable resistors being connected to ground; first and second operating members for operating said four variable resistors, said first operating member being capable of moving the movable terminals of said first and second variable resistors at the same time, said second operating member being capable of moving the movable terminals of said third and fourth variable resistors; and means for visibly indicating the balanced listening position of sounds from said four speaker systems, said means being movably controlled by said first and second operating members in association with respective operation of said operating members so as to indicate said balanced listening position.
Claim 2
Dependent Claim
261 words
In a four-channel stereophonic system having first, second, third and fourth amplifying means for driving first, second, third and fourth speaker systems respectively; an indicating device comprising: first, second, third and fourth variable resistors each having first and second stationary terminals and one movable terminal, the first and second stationary terminals of said first variable resistor being connected to the respective signal transmitting lines in said first and second amplifying means, the first and second stationary terminals of said second variable resistor being connected to the respective signal transmitting lines in said third and fourth amplifying means, the first and second stationary terminals of said third variable resistor being connected to the respective signal transmitting lines in said first and third amplifying means, the first and second stationary terminals of said fourth variable resistor being connected to the signal transmitting lines in said second and fourth amplifying means, the respective moving terminals of said first, second, third and fourth variable resistors being connected to ground; first and second operating members for operating said four variable resistors, said first operating member being capable of moving the movable terminals of said first and second variable resistors at the same time, said second operating member being capable of moving the movable terminals of said third and fourth variable resistors; and means for visibly indicating the balanced listening position of sounds from said four speaker systems, said means being movably controlled by said first and second operating members in association with respective operation of said operating members so as to indicate said balanced listening position.
Claim 3
Dependent Claim
72 words
An indicating device according to claim 1, wherein said first and second variable resistors and said third and fourth resistors are in the form of first and second pairs of variable resistors of the slide type respectively and mounted on a reproducing apparatus of said four-channel stereophonic system in a manner so that said first and second operating members are slidably movable in perpendicular directions along a panel of said reproducing apparatus.
Claim 4
Dependent Claim
53 words
An indicating device according to claim 1, wherein said means for visibly indicating the balanced listening position includes a lamp movable in association with the respective operation of said first and second operating members and an indicating board provided with a grid-like pattern, light from said lamp being projected on said indicating board.
References Cited (Backward Citations)
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |