Patent US5099281A successfully refreshed from Google Patents.
Patent US5452360A successfully refreshed from Google Patents.
US5452360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound field control device and method for controlling a sound field
Assignee: Yamaha Corp
•
Filing: 1994-11-08
•
Granted: 1995-09-19
•
Expires: 2014-11-08
Abstract
Abstract A sound field control device for simulating a sound field of a small space such as a concert hall in a large space such as an open outdoor space and a large indoor space comprises loudspeakers for controlling a sound field disposed at or in the vicinity of positions in a real space corresponding to positions on a hypothetical peripheral plane which defines a hypothetical space in the real space, and a hypothetical reflected sound synthesizing section for synthesizing hypothetical reflected sounds on the basis of the sounds from a real sound source and supplying the synthesized hypothetical reflected sounds to the loudspeakers. The hypothetical reflected sounds are synthesized so that they will simulate sounds which are emanated from the real sound source and reflected from the hypothetical peripheral plane of the hypothetical space. A natural sound field in which one feels as if he was in an indoor concert hall can be obtained in the whole hypothetical space.
Inventors
- 👤 Shinjiro Yamashita
- 👤 Yasushi Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:27
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/0091; H; H04; H04H; H04H60/00; H04H60/02; H04H60/04; H04R; H04R27/00; G10H2210/00; G10H2210/155; G10H2210/265; G10H2210/281; G10H2210/295; G10H2210/301; G10H2250/00; G10H2250/471; G10H2250/511; G10H2250/531; H04R2227/00; H04R2227/007
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
164 words
A sound field control device for simulating a hypothetical space in a real space having a real sound source comprising: a loudspeaker for controlling a sound field disposed at or in the vicinity of a position in the real space corresponding to a position on a hypothetical peripheral plane which defines the hypothetical space; and a hypothetical reflected sound synthesizing section for synthesizing a hypothetical reflected sound on the basis of a sound from the real sound source and supplying the synthesized hypothetical reflected sound to the loudspeaker, the hypothetical reflected sound being synthesized so that the hypothetical reflected sound simulates a sound which is emanated from the real sound source and reflected at the position on the hypothetical peripheral plane of the hypothetical space; there being a plurality of positions on the hypothetical peripheral plane at which or in the vicinity of which a plurality of the loudspeakers are disposed, the positions being determined with a closer interval toward the real sound source.
Claim 2
Dependent Claim
164 words
A sound field control device for simulating a hypothetical space in a real space having a real sound source comprising: a loudspeaker for controlling a sound field disposed at or in the vicinity of a position in the real space corresponding to a position on a hypothetical peripheral plane which defines the hypothetical space; and a hypothetical reflected sound synthesizing section for synthesizing a hypothetical reflected sound on the basis of a sound from the real sound source and supplying the synthesized hypothetical reflected sound to the loudspeaker, the hypothetical reflected sound being synthesized so that the hypothetical reflected sound simulates a sound which is emanated from the real sound source and reflected at the position on the hypothetical peripheral plane of the hypothetical space; there being a plurality of positions on the hypothetical peripheral plane at which or in the vicinity of which a plurality of the loudspeakers are disposed, the positions being determined with a closer interval toward the real sound source.
Claim 3
Dependent Claim
51 words
A sound field control device as defined in claim 1, wherein the hypothetical reflected sound is synthesized by simulating a reflected sound and generating a reverberation sound using a sound feedback loop including a stage space and combining the reflected sound and the reverberation sound to produce a hypothetical sound field.
Claim 4
Dependent Claim
60 words
A sound field control device as defined in claim 2 wherein the hypothetical reflected sound is synthesized so that the hypothetical reflected sound has a delay time and a gain which are substantially the same as those of the sound emanated from the real sound source and reflected at the position on the hypothetical peripheral plane of the hypothetical space.
Claim 5
Dependent Claim
22 words
A sound field control device as defined in claim 2 wherein the hypothetical sound synthesizing section comprises an finite impulse response filter.
Claim 6
Dependent Claim
35 words
A sound field control device as defined in claim 2 wherein the hypothetical space is a hypothetical hall and the hypothetical peripheral plane comprises a hypothetical wall and a hypothetical ceiling of the hypothetical hall.
Claim 7
Dependent Claim
59 words
A sound field control device as defined in claim 2 wherein the loudspeaker is disposed in such a manner that a direction of a sound emanated from the loudspeaker becomes substantially the same as a direction of which the sound from the real sound source is reflected at the position on the hypothetical peripheral plane of the hypothetical space.
Claim 8
Dependent Claim
24 words
A sound field control device as defined in claim 2 wherein the loudspeaker is disposed outside of the positions on the hypothetical peripheral plane.
Claim 9
Dependent Claim
25 words
A sound field control device as defined in claim 2 which further comprises a loudspeaker for emanating directly the sound from the real sound source.
Claim 10
Dependent Claim
53 words
A sound field control device as defined in claim 2 which further comprises a loudspeaker, a microphone picking up a sound from the loudspeaker, and a delay circuit which delays a signal supplied from the microphone and applies a delayed signal to the loudspeaker, so that an acoustic feedback system is carried out.
Claim 11
Dependent Claim
173 words
A sound field control device for simulating a hypothetical space in a real space having a real sound source, comprising: a plurality of loudspeakers being respectively discretely disposed at or in the vicinity of a position in the real space corresponding to a position on a hypothetical peripheral plane which defines the hypothetical space; hypothetical reflected sound source synthesizing means for synthesizing a plurality of hypothetical reflected sound source signals, the plurality of hypothetical reflected sound source signals being different from each other and respectively corresponding to said plurality of loudspeakers; and supplying means for respectively supplying the plurality of hypothetical reflected sound source signals to said corresponding loudspeakers, wherein a hypothetical reflected sound simulates a sound which is emanated from the real sound source and reflected at the position on the hypothetical peripheral plane of the hypothetical space; a plurality of simulation points at which said plurality of loudspeakers are respectively disposed being determined not to equally divide the hypothetical peripheral plane but with a closer interval toward the real sound source.
Claim 12
Dependent Claim
173 words
A sound field control device for simulating a hypothetical space in a real space having a real sound source, comprising: a plurality of loudspeakers being respectively discretely disposed at or in the vicinity of a position in the real space corresponding to a position on a hypothetical peripheral plane which defines the hypothetical space; hypothetical reflected sound source synthesizing means for synthesizing a plurality of hypothetical reflected sound source signals, the plurality of hypothetical reflected sound source signals being different from each other and respectively corresponding to said plurality of loudspeakers; and supplying means for respectively supplying the plurality of hypothetical reflected sound source signals to said corresponding loudspeakers, wherein a hypothetical reflected sound simulates a sound which is emanated from the real sound source and reflected at the position on the hypothetical peripheral plane of the hypothetical space; a plurality of simulation points at which said plurality of loudspeakers are respectively disposed being determined not to equally divide the hypothetical peripheral plane but with a closer interval toward the real sound source.
Claim 13
Dependent Claim
61 words
A sound field control device as defined in claim 10, wherein the hypothetical reflected sound source synthesizing means synthesizes a plurality of hypothetical reflected sound source signals by simulating a reflected sound and generating a reverberation sound using a sound feedback loop including a stage space and combining the reflected sound and the reverberation sound to produce a hypothetical sound field.
Claim 14
Dependent Claim
78 words
A sound field control device as defined in claim 11, wherein said hypothetical reflected sound source synthesizing means comprises: a memory for storing a plurality of parameters, each parameter representing a characteristic of a hypothetical reflected sound at a position on the hypothetical peripheral plane; and an FIR filter for convolution-operating a sound signal from the real sound source in accordance with one of the parameters to form one of the plurality of hypothetical reflected sound source signals.
Claim 15
Dependent Claim
27 words
A sound field control device as defined in claim 12, wherein one of the parameters comprises delay time information and amplitude information of the hypothetical reflected sound.
Claim 16
Dependent Claim
21 words
A sound field control device as defined in claim 13, wherein the hypothetical reflected sound includes an initial reflected sound group.
Claim 17
Dependent Claim
23 words
A sound field control device as defined in claim 11, wherein said plurality of loudspeakers are disposed outside of the hypothetical peripheral plane.
Claim 18
Dependent Claim
63 words
A sound field control device as defined in claim 11, further comprising reverberation sound generation means for generating the reverberation sound on the basis of the real sound source, said reverberation sound generation means having a microphone and a stage loudspeaker and causing a sound signal from the real sound source to undergo electric-acoustic feedback by utilizing the microphone and the stage loudspeaker.
Claim 19
Dependent Claim
68 words
A sound field control device as defined in claim 16, wherein the reverberation sound generation means generates a reverberation sound signal, and further comprising a matrix circuit for respectively mixing the reverberation sound signal generated by said reverberation sound generation means with each of the hypothetical reflected sound signals generated by said hypothetical reflected sound source synthesizing means and for supplying an added sound signal to each loudspeaker.
Claim 20
Dependent Claim
47 words
A sound field control device as defined in claim 17, wherein said matrix circuit comprises a delay circuit, a level adjusting circuit and an adder to perform functions including time matching, level adjustment, and mixing for the reverberation sound signal and the hypothetical reflected sound source signals.
Claim 21
Dependent Claim
62 words
A sound field control device as defined in claim 16, wherein the reverberation sound generation means generates a reverberation sound signal and the hypothetical reflected sound source signals and the reverberation sound signal are subjected to delay corresponding to time obtained by dividing the distances between a position of the real sound source and a position of each loudspeaker by sound velocity.
References Cited (Backward Citations)
US4237343A
Cited
JPS54145501A
Cited
US4593404A
Cited
US4731848A
Cited
JPS61261997A
Cited
JPS62186590A
Cited
US5142586A
Cited
US4937875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |