Topic
Adaptive Multi-Rate audio codec
About: Adaptive Multi-Rate audio codec is a research topic. Over the lifetime, 1467 publications have been published within this topic receiving 19736 citations. The topic is also known as: AMR & Adaptive Multi-Rate.
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21 Nov 2004
TL;DR: The implementation methodology and optimization techniques commonly used to realize speech coding algorithms and their implementations at bit rates lesser than 8 kbps are emphasized.
Abstract: In the recent past there have been a lot of efforts in the development of speech coding algorithms and their implementations at bit rates lesser than 8 kbps. To support the development of such complex algorithms, computational power of digital signal processors (DSP's) increased tremendously. This lead to DSP's enriched with dedicated hardware support for various application specific features. The software development tools and compiler support has also improved to a large extent. This has slashed down the effort time in implementing the speech codecs. On the other hand, the cost of development tools may be prohibitive for non-vendors and at times high level code conversion tools may not be present at all. This paper emphasizes on the implementation methodology and optimization techniques commonly used to realize such systems where codec implementation in all assembly is necessary. The codec that was chosen for implementing these techniques was the GSM half rate (GSM HR) speech codec. The techniques described here are not limited to only one speech codec but are applicable to any kind of speech codec.
24 Oct 2011
TL;DR: This paper analyzes the difficulties and the corresponding key technology of the G.729 real-time implementation on the ARM, detailedly discusses G.728 speech codec algorithm and its optimization techniques on theARM, and designs a set of theG.729 speech codec running on S3C2440 chip, according to its hardware structure and compiling system features.
Abstract: This paper analyzes the difficulties and the corresponding key technology of the G.729 real-time implementation on the ARM, detailedly discusses G.729 speech codec algorithm and its optimization techniques on the ARM, and designs a set of the G.729 speech codec running on S3C2440 chip, according to its hardware structure and compiling system features.
Patent•
11 Oct 1995
TL;DR: In this article, an automatic gain control circuit controlled the gain for decoding by the use of a maximum prediction value generated at the time of coding, and the accurate gain control of the output signal was thus made possible at decoding.
Abstract: A voice codec apparatus for predictive coding is disclosed, in which an automatic gain control circuit controls the gain for decoding by the use of a maximum prediction value generated at the time of coding. The accurate gain control of the output signal is thus made possible at the time of decoding.
Patent•
18 Nov 2016TL;DR: In this article, the authors discuss techniques related to dynamic audio codec enumeration and dynamically providing communication between drivers, such as providing back door communication between the drivers via mailbox registers in audio codec hardware.
Abstract: Techniques related to dynamic audio codec enumeration and dynamically providing communication between drivers are discussed. Such techniques may include providing back door communication between the drivers via mailbox registers in audio codec hardware.