US3665105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for simulating location and movement of sound
Assignee: Leland Stanford Junior University
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Filing: 1970-03-09
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Granted: 1972-05-23
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Expires: 1990-03-09
Abstract
Abstract A method and system for generating or processing music or sound signal information to provide, in addition to the musical parameters of pitch, loudness, time, timbre, control over the apparent location and movement of the sound. The method and system controls the distribution of energy between loudspeakers to provide amplitude changes for the direct and reverberant signals and doppler shift to give the illusion of motion or arbitrary location in space of the sound produced by the loudspeakers.
Inventors
- 👤 John M Chowning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:17
CPC Classifications
H; H04; H04S; H04S3/00; H04R; H04R3/00; H04R3/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
116 words
The method of processing signals representative of sound information to provide signals in two or more channels which can be reproduced by two or more loudspeakers comprising the steps of varying the frequency of the signals to provide an output signal having an apparent doppler shift corresponding to the apparent velocity of the change in distance from the listener, varying the amplitude of the signal in inverse proportion to the apparent distance from the listener, applying the frequency and amplitude modulated signals to two or more channels, and individually amplitude modulating the signals on each channel in proportion tO the desired direction of sound from the listener whereby to provide sound having apparent movement and direction.
Claim 2
Independent Claim
116 words
The method of processing signals representative of sound information to provide signals in two or more channels which can be reproduced by two or more loudspeakers comprising the steps of varying the frequency of the signals to provide an output signal having an apparent doppler shift corresponding to the apparent velocity of the change in distance from the listener, varying the amplitude of the signal in inverse proportion to the apparent distance from the listener, applying the frequency and amplitude modulated signals to two or more channels, and individually amplitude modulating the signals on each channel in proportion tO the desired direction of sound from the listener whereby to provide sound having apparent movement and direction.
Claim 3
Dependent Claim
21 words
The method as in claim 1 wherein said signal is amplitude modulated in inverse proportion to the square of the distance.
Claim 4
Dependent Claim
52 words
The method as in claim 1 additionally including means for obtaining a fraction of the frequency modulated signal to provide a reverberant signal, varying the amplitude of the reverberant signal in inverse proportion to the desired apparent distance from the listener, and adding said signal equally to the two or more channels.
Claim 5
Dependent Claim
37 words
The method as in claim 3 including the steps of developing a reverberant signal whose amplitude for each channel varies with direction and distance and adding said signal to the signals in said one or more channels.
Claim 6
Dependent Claim
37 words
The method as in claim 1 including the steps of developing a reverberant signal whose amplitude for each channel varies with direction and distance and adding said signal to the signals in said one or more channels.
Claim 7
Independent Claim
92 words
The method of processing signals representing sound information to provide reverberant signals in two or more channels which can be reproduced by two or more loudspeakers which comprises varying the amplitude of said signals in inverse proportion to the desired apparent distance from a listener, obtaining a fraction of the amplitude varied signals and varying the amplitude of said fraction in inverse proportion to the distance from the listener, delaying the amplitude varied signals and fraction, and adding the delayed signals equally to the undelayed signals in said two or more channels.
Claim 8
Independent Claim
92 words
The method of processing signals representing sound information to provide reverberant signals in two or more channels which can be reproduced by two or more loudspeakers which comprises varying the amplitude of said signals in inverse proportion to the desired apparent distance from a listener, obtaining a fraction of the amplitude varied signals and varying the amplitude of said fraction in inverse proportion to the distance from the listener, delaying the amplitude varied signals and fraction, and adding the delayed signals equally to the undelayed signals in said two or more channels.
Claim 9
Dependent Claim
39 words
The method as in claim 6 including the step of developing a reverberant signal whose amplitude for each channel varies in proportion to direction and distance and adding said signal to the signals in said two or more channels.
Claim 10
Dependent Claim
90 words
Apparatus for processing signals having a predetermined frequency representative of sound information to provide signals which can be applied to two or more loudspeakers for reproduction including means for receiving said signals and providing an output signal whose frequency is modulated in accordance with apparent rate of change of distance away from a listener, means for receiving said frequency signal and providing a plurality of signals each having amplitude corresponding to the direction of the signals from the listener, and means for forming a recording of said signals for reproduction.
Claim 11
Dependent Claim
90 words
Apparatus for processing signals having a predetermined frequency representative of sound information to provide signals which can be applied to two or more loudspeakers for reproduction including means for receiving said signals and providing an output signal whose frequency is modulated in accordance with apparent rate of change of distance away from a listener, means for receiving said frequency signal and providing a plurality of signals each having amplitude corresponding to the direction of the signals from the listener, and means for forming a recording of said signals for reproduction.
Claim 12
Dependent Claim
24 words
Apparatus as in claim 8 including means for obtaining a fraction of said signal and adding the same equally to the plurality of signals.
Claim 13
Dependent Claim
38 words
Apparatus as in claim 9 including additionally means for receiving said fraction of said signal and providing a plurality of signals having amplitude corresponding to direction of direct signal and adding said signal to the plurality of signals.
Claim 14
Dependent Claim
80 words
Apparatus for processing signals having a predetermined frequency representative of sound information to provide signals which can be applied to two or more loudspeakers for reproduction including means for receiving said signals and providing an output signal whose frequency is modulated in accordance with apparent rate of change of distance away from a listener, and means for receiving said frequency signal and providing a plurality of signals each having amplitude corresponding to the direction of the signals from the listener.
Claim 15
Dependent Claim
80 words
Apparatus for processing signals having a predetermined frequency representative of sound information to provide signals which can be applied to two or more loudspeakers for reproduction including means for receiving said signals and providing an output signal whose frequency is modulated in accordance with apparent rate of change of distance away from a listener, and means for receiving said frequency signal and providing a plurality of signals each having amplitude corresponding to the direction of the signals from the listener.
Claim 16
Dependent Claim
26 words
The method as in claim 5 wherein said signals are amplitude modulated in proportion to direction and the amplitude modulated signals are added to said channels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |