Audio coding device, audio coding method, and audio codec device
US-2015371640-A1 · Dec 24, 2015 · US
Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks
US9847089B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9847089-B2 |
| Application number | US-201615392545-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 28, 2016 |
| Priority date | Sep 18, 2002 |
| Publication date | Dec 19, 2017 |
| Grant date | Dec 19, 2017 |
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Abstract
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The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
First claim
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The invention claimed is: 1. Apparatus for performing gain adjustment on a plurality of audio sub band signals generated by filtering an audio signal using a filter bank, the filter bank having sub band filters, adjacent sub band filters of the filterbank having transition bands overlapping in an overlapping range, comprising: an analyzer for analysing the plurality of audio sub band signals generated by filtering the signal using the filter bank to determine, whether a subband si…
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- G10L19/0204Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
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- What does patent US9847089B2 cover?
- The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate …
- Who is the assignee on this patent?
- Dolby Int Ab
- What technology area does this patent fall under?
- Primary CPC classification G10L19/0204. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Dec 19 2017 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).