Open earphone
US-2024422466-A1 · Dec 19, 2024 · US
Decoding apparatus and method, encoding apparatus and method, and program
US8972249B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8972249-B2 |
| Application number | US-201113634658-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 15, 2011 |
| Priority date | Mar 31, 2010 |
| Publication date | Mar 3, 2015 |
| Grant date | Mar 3, 2015 |
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Abstract
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The present invention relates to a decoding apparatus, a decoding method, an encoding apparatus, an encoding method, and programs that can shorten the delay time caused by the band extension at the time of decoding, and restrain increases in resources on the decoding side. A higher frequency component generating unit ( 73 ) generates a pseudo higher frequency spectrum by using a lower frequency spectrum (SP-L) and a higher frequency envelope (ENV-H). A phase randomizing unit ( 74 ) randomizes the phase of the pseudo higher frequency spectrum, based on a random flag (RND). An inverse MDCT unit ( 75 ) denormalizes the lower frequency spectrum (SP-L) by using a lower frequency envelope (ENV-L), and combines the pseudo higher frequency spectrum supplied from the phase randomizing unit ( 74 ) with the denormalized lower frequency spectrum (SP-L). The combination result is used as the spectrum of the entire band. The present invention can be applied to a decoding apparatus that performs band extension decoding, for example.
First claim
Opening claim text (preview).
The invention claimed is: 1. A decoding apparatus comprising: an obtaining unit configured to obtain, as encoding results, a lower frequency envelope of an audio signal, a lower frequency spectrum normalized by using the lower frequency envelope, a higher frequency envelope of the audio signal, and a degree of concentration of a higher frequency spectrum of the audio signal; a generating unit configured to generate a spectrum by using the normalized lower frequency spectrum and…
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- G10L21/038Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
- G10L19/02Primary
Physics · mapped topic
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Frequently asked questions
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- What does patent US8972249B2 cover?
- The present invention relates to a decoding apparatus, a decoding method, an encoding apparatus, an encoding method, and programs that can shorten the delay time caused by the band extension at the time of decoding, and restrain increases in resources on the decoding side. A higher frequency component generating unit ( 73 ) generates a pseudo higher frequency spectrum by using a lower fre…
- Who is the assignee on this patent?
- Suzuki Shiro, Matsumura Yuuki, Matsumoto Jun, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification G10L21/038. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 03 2015 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).