US4769843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo signal reproducing system
Assignee: Nissan Motor Co Ltd
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Filing: 1986-03-12
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Granted: 1988-09-06
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Expires: 2006-03-12
Abstract
Abstract A system for reproducing stereophonic signal to create a stereophonic sound image in front of each of listeners sitting side by side in a compartment. The system includes a first loudspeaker positioned relative to the right of the first listener sitting on the right, a second side loudspeaker positioned relative to the left of the second listener sitting on the left, and a center loudspeaker unit positioned between the first and second side loudspeakers. A signal generator generates R and L stereophonic signals. The R signal is applied to drive the first side loudspeaker and the L signal is applied to drive the second side loudspeaker. The R and L signals are applied to drive the center loudspeaker unit. The signal generator includes a device for providing a predetermined time delay to the R and L signals applied to drive the center loudspeaker unit with respect to the signals applied to drive the first and second side loudspeakers.
Inventors
- 👤 Hiroshi Imai
- 👤 Junichi Kasai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:29
CPC Classifications
H; H04; H04R; H04R3/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
A system for reproducing stereophonic signals to create a stereophonic sound image in front of each of first and second side by side listening positions in a compartment, said first listening position being to the right of said second listening position, comprising: a first side loudspeaker positioned relative to the right of the first listening position; a second side loudspeaker positioned relative to the left of the second listening position; a center loudspeaker unit positioned between said first and second loudspeakers; and a signal generator circuit for generating R- and L-channel stereophonic signals, the R-channel signal being applied to drive said first side loudspeaker, the L-channel signal being applied to drive said second side loudspeaker, the R- and L-channel signals being applied to drive said center loudspeaker unit, said signal generator circuit including time delay means for providing a predetermined time delay to the signals applied to drive said center loudspeaker unit with respect to the signals applied to drive said first and second side loudspeakers.
Claim 2
Independent Claim
166 words
A system for reproducing stereophonic signals to create a stereophonic sound image in front of each of first and second side by side listening positions in a compartment, said first listening position being to the right of said second listening position, comprising: a first side loudspeaker positioned relative to the right of the first listening position; a second side loudspeaker positioned relative to the left of the second listening position; a center loudspeaker unit positioned between said first and second loudspeakers; and a signal generator circuit for generating R- and L-channel stereophonic signals, the R-channel signal being applied to drive said first side loudspeaker, the L-channel signal being applied to drive said second side loudspeaker, the R- and L-channel signals being applied to drive said center loudspeaker unit, said signal generator circuit including time delay means for providing a predetermined time delay to the signals applied to drive said center loudspeaker unit with respect to the signals applied to drive said first and second side loudspeakers.
Claim 3
Dependent Claim
46 words
The system as claimed in claim 1, wherein said signal generator circuit includes means for controlling the level of the signals applied to drive said center loudspeaker unit to be greater than the level of the signals applied to drive said first and second side loudspeakers.
Claim 4
Independent Claim
188 words
A system for reproducing stereophonic signals to create a stereophonic sound image in front of each of first and second side by side listening positions in a compartment, said first listening position being to the right of said second listening position, comprising: a first side loudspeaker positioned relative to the right of the first listening position; a first center loudspeaker positioned relative to the left of the first listening position; a second side loudspeaker positioned relative to the left of the second listening position; a second center loudspeaker positioned relative to the right of the second listening position; and a signal generator circuit for generating R- and L-channel stereophonic signals, the R-channel signal being applied to drive said first side loudspeaker, and also to drive said first center loudspeaker, the L-channel signal being applied to drive said second side loudspeaker and also to drive said second center loudspeaker, said signal generator circuit including time delay means for providing a predetermined time delay to the signals applied to drive said first and second center loudspeakers with respect to the signals applied to drive said first and second side loudspeakers.
Claim 5
Independent Claim
188 words
A system for reproducing stereophonic signals to create a stereophonic sound image in front of each of first and second side by side listening positions in a compartment, said first listening position being to the right of said second listening position, comprising: a first side loudspeaker positioned relative to the right of the first listening position; a first center loudspeaker positioned relative to the left of the first listening position; a second side loudspeaker positioned relative to the left of the second listening position; a second center loudspeaker positioned relative to the right of the second listening position; and a signal generator circuit for generating R- and L-channel stereophonic signals, the R-channel signal being applied to drive said first side loudspeaker, and also to drive said first center loudspeaker, the L-channel signal being applied to drive said second side loudspeaker and also to drive said second center loudspeaker, said signal generator circuit including time delay means for providing a predetermined time delay to the signals applied to drive said first and second center loudspeakers with respect to the signals applied to drive said first and second side loudspeakers.
Claim 6
Dependent Claim
28 words
The system as claimed in claim 3, wherein said second center loudspeaker is placed at a smaller distance from said second listening position than said first center loudspeaker.
Claim 7
Dependent Claim
48 words
The system as claimed in claim 4, wherein said signal generator circuit includes means for controlling the level of the signals applied to drive said first and second center loudspeakers to be greater than the level of the signals applied to drive said first and second side loudspeakers.
Claim 8
Independent Claim
184 words
A system for reproducing stereophonic signals to create a stereophonic sound image in front of each of first and second side by side listening positions in a compartment, said first listening position being to the right of said second listening position, comprising: a first side loudspeaker positioned relative to the right of the first listening position; a second side loudspeaker positioned relative to the left of the second listening position; a center loudspeaker positioned between said first and second side loudspeakers; a signal generator circuit for generating R- and L-channel stereophonic signals, said signal generator circuit including means for electrically adding the R- and L-channel signal to provide an L+R signal, the R-channel signal being applied to drive said first side loudspeaker, the L-channel signal being applied to drive said second side loudspeaker, the L+R signal being applied to drive said center loudspeaker, said signal generator circuit including time delay means for providing a predetermined time delay to the L+R signal applied to drive said center loudspeaker with respect to the L and R signals applied to drive said first and second side loudspeakers.
Claim 9
Independent Claim
184 words
A system for reproducing stereophonic signals to create a stereophonic sound image in front of each of first and second side by side listening positions in a compartment, said first listening position being to the right of said second listening position, comprising: a first side loudspeaker positioned relative to the right of the first listening position; a second side loudspeaker positioned relative to the left of the second listening position; a center loudspeaker positioned between said first and second side loudspeakers; a signal generator circuit for generating R- and L-channel stereophonic signals, said signal generator circuit including means for electrically adding the R- and L-channel signal to provide an L+R signal, the R-channel signal being applied to drive said first side loudspeaker, the L-channel signal being applied to drive said second side loudspeaker, the L+R signal being applied to drive said center loudspeaker, said signal generator circuit including time delay means for providing a predetermined time delay to the L+R signal applied to drive said center loudspeaker with respect to the L and R signals applied to drive said first and second side loudspeakers.
Claim 10
Dependent Claim
46 words
The system as claimed in claim 6, wherein said signal generator circuit includes means for controlling the level of the L+R signal applied to drive said center loudspeaker to be greater than the level of the signals applied to drive said first and second side loudspeakers.
Claim 11
Dependent Claim
66 words
The system as claimed in claim 6, which includes a first echo sound loudspeaker positioned between said first side loudspeaker and said center loudspeaker, and a second echo sound loudspeaker placed between said second side loudspeaker and said center loudspeaker, and where said signal generator circuit includes means responsive to the L+R signal for generating echo signals for driving said first and second echo sound loudspeakers.
Claim 12
Dependent Claim
48 words
A system as recited in claim 3, wherein said signal generator circuit includes means for controlling the level of the signals applied to drive said first and second center loudspeakers to be greater than the level of the signals applied to drive said first and second side loudspeakers.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |