Enhancing performance of spectral band replication and related high frequency reconstruction coding
US-9245533-B2 · Jan 26, 2016 · US
Adaptive Bandwidth Extension and Apparatus for the Same
US2015073784A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2015073784-A1 |
| Application number | US-201414478839-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 5, 2014 |
| Priority date | Sep 10, 2013 |
| Publication date | Mar 12, 2015 |
| Grant date | — |
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Abstract
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In one embodiment of the present invention, a method of decoding an encoded audio bitstream and generating frequency bandwidth extension includes decoding the audio bitstream to produce a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band. A sub-band area is selected from within the low frequency band using a parameter which indicates energy information of a spectral envelope of the decoded low band audio signal. A high band excitation spectrum is generated for a high frequency band by copying a sub-band excitation spectrum from the selected sub-band area to a high sub-band area corresponding to the high frequency band. Using the generated high band excitation spectrum, an extended high band audio signal is generated by applying a high band spectral envelope. The extended high band audio signal is added to the decoded low band audio signal to generate an audio output signal having an extended frequency bandwidth.
First claim
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What is claimed is: 1 . A method of decoding an encoded audio bitstream and generating frequency bandwidth extension at a decoder, the method comprising: decoding the audio bitstream to produce a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band; selecting a sub-band area from within the low frequency band using a parameter which indicates energy information of a spectral envelope of the decoded low band audio signa…
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- G10L19/12Primary
Physics · mapped topic
- G10L21/038Primary
Physics · mapped topic
Physics · mapped topic
- G10L19/22Primary
Physics · mapped topic
Physics · mapped topic
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- What does patent US2015073784A1 cover?
- In one embodiment of the present invention, a method of decoding an encoded audio bitstream and generating frequency bandwidth extension includes decoding the audio bitstream to produce a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band. A sub-band area is selected from within the low frequency band using a parameter which indicates…
- Who is the assignee on this patent?
- Huawei Tech Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G10L19/12. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Mar 12 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).