Bitrate constrained variable bitrate audio encoding

Details Bitrate constrained variable bitrate audio encoding Bitrate constrained variable bitrate audio encoding

2005-02-25

2009-12-15

Hudspeth, David R (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

With content reduction encoding

C704S229000

Reexamination Certificate

active

07634413

ABSTRACT:
A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.

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Grill, B. et al., ISO/IEC FCD 14496-3 Subpart 1, May 15, 1998. In: Information Technology—Very Low Bitrate Audio-Visual Coding [CD-ROM]. (References on enclosed CD-ROM).

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