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1. MYPI 2011002734 - SURROUND SOUND VIRTUALIZER AND METHOD WITH DYNAMIC RANGE COMPRESSION

Office Malaysia
Application Number PI 2011002734
Application Date 01.12.2009
Publication Number PI 2011002734
Publication Date 15.06.2010
Publication Kind A
Applicants DOLBY LABORATORIES LICENSING CORPORATION
Inventors BROWN, C. PHILLIP
Agents SOO EE LIN**
Priority Data 61/122,647 15.12.2008 US
Title
(EN) SURROUND SOUND VIRTUALIZER AND METHOD WITH DYNAMIC RANGE COMPRESSION
Abstract
(EN)
METHOD AND SYSTEM FOR GENERATING OUTPUT SIGNALS FOR REPRODUCTION BY TWO PHYSICAL SPEAKERS IN RESPONSE TO INPUT AUDIO SIGNALS INDICATIVE OF SOUND FROM MULTIPLE SOURCE LOCATIONS INCLUDING AT LEAST TWO REAR LOCATIONS. TYPICALLY, THE INPUT SIGNALS ARE INDICATIVE OF SOUND FROM THREE FRONT LOCATIONS AND TWO REAR LOCATIONS (LEFT AND RIGHT SURROUND SOURCES). A VIRTUAL LZER GENERATES LEFT AND RIGHT SURROUND OUTPUTS USEFUL FOR DRIVING FRONT LOUDSPEAKERS TO EMIT SOUND THAT A LISTENER PERCEIVES AS EMITTING FROM REAR SOURCES. TYPICALLY, THE VIRTUALIZER GENERATES LEFT AND RIGHT SURROUND OUTPUTS BY TRANSFORMING REAR SOURCE INPUTS IN ACCORDANCE WITH A HEAD— RELATED TRANSFER FUNCTION. TO ENSURE THAT VIRTUAL CHANNELS ARE WELL HEARD IN THE PRESENCE OF OTHER CHANNELS, THE VIRTUALIZER PERFORMS DYNAMIC RANGE COMPRESSION ON REAR SOURCE INPUTS. THE DYNAMIC RANGE COMPRESSION IS PREFERABLY ACCOMPLISHED BY AMPLIFYING REAR SOURCE INPUTS OR PARTIALLY PROCESSED VERSIONS THEREOF IN A NONLINEAR WAY RELATIVE TO FRONT SOURCE INPUTS.