System and method for optimization of three-dimensional audio

• US 20030031333A1
• Filed: 09/05/2002
• Published: 02/13/2003
• Est. Priority Date: 03/09/2000
• Status: Active Grant

• Current Assignee: Be4 Ltd.
• Original Assignee: Be4 Ltd.
• Inventors: Cohen, Yuval, Naveh, Giora, Bar On, Amir
• Granted Patent: US 7,123,731 B2
• Time in Patent Office: Days
• US Class Current: 381/303
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/302 Electronic adaptation of stereophonic sound system to listener position or orientation H04S7/301 takes precedence

Abstract

The invention provides a system for optimization of three-dimensional audio listening having a media player and a multiplicity of speakers disposed within a listening space, the system including a portable sensor having a multiplicity of transducers strategically arranged about the sensor for receiving test signals from the speakers and for transmitting the signals to a processor connectable in the system for receiving multi-channel audio signals from the media player and for transmitting the multi-channel audio signals to the multiplicity of speakers, the processor including (a) means for initiating transmission of test signals to each of the speakers and for receiving the test signals from the speakers to be processed for determining the location of each of the speakers relative to a listening place within the space determined by the placement of the sensor; (b) means for manipulating each sound track of the multi-channel sound signals with respect to intensity, phase and/or equalization according to the relative location of each speaker in order to create virtual sound sources in desired positions, and (c) means for communicating between the sensor and the processor. The invention further provides a method for the optimization of three-dimensional audio listening using the above-described system.

Claims

1. A system for optimization of three-dimensional audio listening having a media player and a multiplicity of speakers disposed within a listening space, said system comprising:

a portable sensor having a multiplicity of transducers strategically arranged about said sensor for receiving test signals from said speakers and for transmitting said signals to a processor connectable in the system for receiving multi-channel audio signals from said media player and for transmitting said multi-channel audio signals to said multiplicity of speakers, said processor including;

a) means for initiating transmission of test signals to each of said speakers and for receiving said test signals from said speakers to be processed for determining the location of each of said speakers relative to a listening place within said space determined by the placement of said sensor;

b) means for manipulating each sound track of said multi-channel sound signals with respect to intensity, phase and/or equalization according to the relative location of each speaker in order to create virtual sound sources in desired positions, and

c) means for communicating between said sensor and said processor.

2. The system as claimed in claim 1, wherein the transducers of said sensor are arranged to define the disposition of each of said speakers, both in the horizontal plane as well as in elevation, with respect to the location of the sensor.

3. The system as claimed in claim 1, wherein the test signals received by said sensor and transmitted to said processor are at frequencies higher than the human audible range.

4. The system as claimed in claim 1, wherein said sensor includes a timing unit for measuring the time elapsing between the initiation of said test signals to each of said speakers and the time said signals are received by said transducers.

5. The system as claimed in claim 1, wherein the communication between said sensor and said processor is wireless.

6. A method for the optimization of three-dimensional audio listening using a system including a media player, a multiplicity of speakers disposed within a listening space and a processor, said method comprising:

selecting a listener sweet spot within said listening space;

electronically determining the azimuth and elevation of the distance between said sweet spot and each of said speakers, and

operating said speakers with respect to intensity, phase and/or equalization in accordance with its position relative to said sweet spot.

7. The method as claimed in claim 6, wherein the distance between said sweet spot and each of said speakers is determined by transmitting test signals to said speakers, receiving said signals by a sensor located at said sweet spot, measuring the time elapse between the initiation of said test signals to each of said speakers and the time said signals are received by said sensor, and transmitting said measurements to said processor.

8. The method as claimed in claim 7, wherein said test signals are transmitted at frequencies higher than the human audible range.

9. The method as claimed in claim 7, wherein said test signals are signals consisting of the music played.

10. The method as claimed in claim 7, wherein the transmission of said test signals is wireless.

11. The method as claimed in claim 7, wherein said sensor is operable to measure the impulse response of each of said speakers and to analyze the transfer function of each speaker, and to analyze the acoustic characteristics of the room.

12. The method as claimed in claim 11, wherein said measurements are processed to compensate for non-linearity of said speakers, to correct the frequency response of said speakers and to reduce unwanted echoes and/or reverberations to enhance the quality of the sound in the sweet spot.