Patent US4648117A successfully refreshed from Google Patents.
US4648117A
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US
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Mobile sound field correcting device
Assignee: Pioneer Corp
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Filing: 1985-05-31
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Granted: 1987-03-03
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Expires: 2005-05-31
Abstract
Abstract A sound field correcting device for use in a stereophonic system intended for vehicular use. Speakers are installed on opposite sides of both the front and rear seats of the vehicle. The number of persons seated in the vehicle is determined and applied to a correcting unit. When plural persons are seated in the vehicle, the sound pressure levels in the high-frequency range of loudspeakers is increased. Also, the sound pressure levels of the speakers can be corrected in accordance with the positions at which persons are seated in the vehicle.
Inventors
- 👤 Yoshiro Kunugi
- 👤 Akio Tokumo
- 👤 Toshikazu Yoshimi
- 👤 Shinjiro Kato
- 👤 Yoshio Sasaki
- 👤 Makoto Odaka
- 👤 Takeshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:57
CPC Classifications
H; H04; H04S; H04S7/00; H04S7/30; H04S7/307; H03; H03G; H03G3/00; H03G5/00; H04S1/00; H04S1/002; H04R; H04R2499/00; H04R2499/10; H04R2499/13
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
87 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated by loudspeakers installed in correspondence to seats in the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated in said vehicle; and correcting means for varying, when a plurality of persons are seated in said vehicle, sound pressure level of said loudspeakers corresponding to the difference in level therebetween, according to said data inputted by said inputting means.
Claim 2
Dependent Claim
87 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated by loudspeakers installed in correspondence to seats in the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated in said vehicle; and correcting means for varying, when a plurality of persons are seated in said vehicle, sound pressure level of said loudspeakers corresponding to the difference in level therebetween, according to said data inputted by said inputting means.
Claim 3
Dependent Claim
47 words
The device as claimed in claim 1, wherein a pair of loudspeakers are installed on the right and left sides of a front seat of said vehicle and a pair of loudspeakers are installed on the right and left sides of a rear seat of said vehicle.
Claim 4
Dependent Claim
39 words
The device as claimed in claim 1, wherein said correcting means comprises means for varying a sound pressure level of each loudspeaker by an amount of approximately 1 to 2 dB in a frequency range higher than 1 KHz.
Claim 5
Dependent Claim
96 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of loudspeakers installed on right and left sides of a front seat of the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated on said front seat; and correcting means for, according to said data inputted by said inputting means, increasing, when one person is seated on said front seat, the output level of a one of said loudspeakers closer to said one person.
Claim 6
Dependent Claim
96 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of loudspeakers installed on right and left sides of a front seat of the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated on said front seat; and correcting means for, according to said data inputted by said inputting means, increasing, when one person is seated on said front seat, the output level of a one of said loudspeakers closer to said one person.
Claim 7
Dependent Claim
162 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of loudspeakers installed on right and left sides of a front seat of the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated in said vehicle; first correcting means for, according to said data inputted by said inputting means, making output levels of said pair of loudspeakers substantially equal to each other when a plurality of persons are seated on said front seat and increasing, when only one person is seated on said front seat, the output level of a one of said loudspeakers closer to said person; and second correcting means for, according to said data inputted by said inputting means, varying a sound pressure level of said pair of loudspeakers corresponding to the difference in level therebetween, when a plurlity of persons are seated on said front seat.
Claim 8
Dependent Claim
162 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of loudspeakers installed on right and left sides of a front seat of the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated in said vehicle; first correcting means for, according to said data inputted by said inputting means, making output levels of said pair of loudspeakers substantially equal to each other when a plurality of persons are seated on said front seat and increasing, when only one person is seated on said front seat, the output level of a one of said loudspeakers closer to said person; and second correcting means for, according to said data inputted by said inputting means, varying a sound pressure level of said pair of loudspeakers corresponding to the difference in level therebetween, when a plurlity of persons are seated on said front seat.
Claim 9
Dependent Claim
228 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of front side loudspeakers installed on right and left sides of a front seat of the vehicle and a pair of rear side loudspeakers installed on right and left sides of a rear seat of the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated on said front seat and data representing a number of persons seated on said rear seat; first correcting means for, according to said data inputted by said inputting means, making output levels of said pair of front side loudspeakers subtantially equal to each other when a plurality of persons are seated on said front seat and increasing, when only one person is seated on said front seat, the output level of a one of said pair of front side loudspeakers closer to said person; and second correcting means for, according to said data inputted by said inputting means, making output levels of said rear side loudspeakers equal to each other when a plurality of persons are seated on said rear seat, and decreasing, when only one person is seated on said rear seat, the output level of a one of said pair of rear side loudspeakers closer to said one person.
Claim 10
Dependent Claim
228 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of front side loudspeakers installed on right and left sides of a front seat of the vehicle and a pair of rear side loudspeakers installed on right and left sides of a rear seat of the vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated on said front seat and data representing a number of persons seated on said rear seat; first correcting means for, according to said data inputted by said inputting means, making output levels of said pair of front side loudspeakers subtantially equal to each other when a plurality of persons are seated on said front seat and increasing, when only one person is seated on said front seat, the output level of a one of said pair of front side loudspeakers closer to said person; and second correcting means for, according to said data inputted by said inputting means, making output levels of said rear side loudspeakers equal to each other when a plurality of persons are seated on said rear seat, and decreasing, when only one person is seated on said rear seat, the output level of a one of said pair of rear side loudspeakers closer to said one person.
Claim 11
Dependent Claim
20 words
The device as claimed in claim 6, wherein said pair of rear side loudspeakers are installed on a parcel tray.
Claim 12
Dependent Claim
203 words
A mobile sound filed correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of front side loudspeakers installed on right and left sides of a front seat of a vehicle and a pair of rear side loudspeakers installed on right and left sides of a rear seat in said vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated on said front seat and data representing a number of persons seated on said rear seat; first correcting means for, according to said data inputted by said inputting means, varying a sound pressure level of said pair of front said loudspeaker corresponding to the difference in level therebetween, when a plurality of persons are seated on said front seat; and second correcting means for, according to said data inputted by said inputting means, making output levels of said one pair of rear side loudspeakers equal to each other when a plurality of persons are seated on said rear seat and when only one person is seated decreasing the output level of a one of said rear side loudspeakers closer to said person on said rear seat.
Claim 13
Dependent Claim
203 words
A mobile sound filed correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from a pair of front side loudspeakers installed on right and left sides of a front seat of a vehicle and a pair of rear side loudspeakers installed on right and left sides of a rear seat in said vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons seated on said front seat and data representing a number of persons seated on said rear seat; first correcting means for, according to said data inputted by said inputting means, varying a sound pressure level of said pair of front said loudspeaker corresponding to the difference in level therebetween, when a plurality of persons are seated on said front seat; and second correcting means for, according to said data inputted by said inputting means, making output levels of said one pair of rear side loudspeakers equal to each other when a plurality of persons are seated on said rear seat and when only one person is seated decreasing the output level of a one of said rear side loudspeakers closer to said person on said rear seat.
Claim 14
Dependent Claim
18 words
The device as claimed in claim 8, wherein said rear side loudspeakers are installed on a parcel tray.
Claim 15
Dependent Claim
77 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from loudspeakers installed for seats in said vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons sitting on each seat; and correcting means for, according to said data inputted by said inputting means, varying output characteristics of said loudspeakers to correct said acoustic characteristic in said vehicle sound field.
Claim 16
Dependent Claim
77 words
A mobile sound field correcting device for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from loudspeakers installed for seats in said vehicle and by reflected waves thereof, comprising: means for inputting data representing a number of persons sitting on each seat; and correcting means for, according to said data inputted by said inputting means, varying output characteristics of said loudspeakers to correct said acoustic characteristic in said vehicle sound field.
Claim 17
Dependent Claim
34 words
The device as claimed in claim 10, wherein said inputting means comprises a plurality of operating means provided for said front and rear seats for inputting the number of persons sitting on each seat.
Claim 18
Dependent Claim
40 words
The device as claimed in claim 10, wherein said inputting means comprises a plurality of detecting means each detecting when a person is seated on a respective seat, thereby to automatically input a number of persons sitting on each seat.
Claim 19
Dependent Claim
21 words
The device as claimed in claim 10, further comprising visual display means for displaying the number of persons on each seat.
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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |