Invention Grant
- Patent Title: Method and apparatus for compressing and decompressing a Higher Order Ambisonics representation for a sound field
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Application No.: US14651313Application Date: 2013-12-04
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Publication No.: US09646618B2Publication Date: 2017-05-09
- Inventor: Alexander Krueger , Sven Kordon , Johannes Boehm
- Applicant: DOLBY LABORATORIES LICENSING CORPORATION
- Applicant Address: US CA San Francisco
- Assignee: Dolby Laboratories Licensing Corporation
- Current Assignee: Dolby Laboratories Licensing Corporation
- Current Assignee Address: US CA San Francisco
- Priority: EP12306569 20121212
- International Application: PCT/EP2013/075559 WO 20131204
- International Announcement: WO2014/090660 WO 20140619
- Main IPC: H04S3/00
- IPC: H04S3/00 ; G10L19/008

Abstract:
The invention improves HOA sound field representation compression. The HOA representation is analyzed for the presence of dominant sound sources and their directions are estimated. Then the HOA representation is decomposed into a number of dominant directional signals and a residual component. This residual component is transformed into the discrete spatial domain in order to obtain general plane wave functions at uniform sampling directions, which are predicted from the dominant directional signals. Finally, the prediction error is transformed back to the HOA domain and represents the residual ambient HOA component for which an order reduction is performed, followed by perceptual encoding of the dominant directional signals and the residual component.
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