Concept for generating an enhanced sound field description or a modified sound field description using a multi-point sound field description
US-2024098445-A1 · Mar 21, 2024 · US
Method and apparatus for audio matrix decoding
US9357323B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9357323-B2 |
| Application number | US-201213468053-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 10, 2012 |
| Priority date | May 10, 2012 |
| Publication date | May 31, 2016 |
| Grant date | May 31, 2016 |
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Abstract
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An audio matrix decoder is provided for decoding input signals L t and R t into output signals L out , C out , S out , and R out . The decoder circuit includes a main signal path having a passive matrix decoder and a cross talk canceller configured to apply variable gain values to intermediate signals and to compute the output signals L out , C out , S out , and R out . The decoder also includes a control signal path having a passive matrix decoder and a linear equation solver. The linear equation solver is configured to compute the variable gain values based on the intermediate signals and the necessary condition that re-encoded values of the output signals L out , C out , S out , and R out are equal to the input signals L t and R t . The linear equation solver is also configured to feed the variable gain values to the cross talk canceller for use in computing the output signals.
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What is claimed: 1. An audio matrix decoder for decoding input signals L t and R t into output signals L out , C out , S out , and R out for a panning angle α, the audio matrix decoder comprising: a passive matrix decoder module having first and second summers each having a scaling coefficient a, said passive matrix decoder module being configured to decode said input signals L t and R t into intermediate signals L, C, S, and R; and a cross talk canceller module comprising: a first gain element configured to apply a variable gain g l to said intermediate signal L; a second gain element configured to apply a variable gain g c to said intermediate signal C; a third gain element configured to apply a variable gain g s to said intermediate signal S; a fourth gain element configured to apply a variable gain g r to said intermediate signal R; a third summer, having a scaling coefficient p; a fourth summer having a scaling coefficient a; a fifth summer having said scaling coefficient a; and a sixth summer having a scaling coefficient p, where p=1/(2a); wherein: g l = C a · L , g c = 0 , g s = R p · S , and g r = 0 for 0 ≤ α < 90. 2. The audio matrix decoder of claim 1 , wherein: g l = S a · L , g c = R p · C , g s = 0 , and g r = 0 for 90 ≤ α < 180 ; g l = 0 , g c = L p · C , g s = 0 , and g r = S a · R for 180 ≤ α < 270 ; and g l = 0 , g c = 0 , g s =
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- H04S3/02Primary
of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other · CPC title
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- What does patent US9357323B2 cover?
- An audio matrix decoder is provided for decoding input signals L t and R t into output signals L out , C out , S out , and R out . The decoder circuit includes a main signal path having a passive matrix decoder and a cross talk canceller configured to apply variable gain values to intermediate signals and to compute the output signals L out , C out , S out , and R out . The decoder also inclu…
- Who is the assignee on this patent?
- Ramabadran Tenkasi V, Google Technology Holdings LLC
- What technology area does this patent fall under?
- Primary CPC classification H04S3/02. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 31 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).