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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Patent•
22 Mar 2012TL;DR: In this article, the authors proposed an audio signal coding and decoding method and device based on quantization of sub-band normalization factors and bit rate information to improve the audio quality.
Abstract: Embodiments of the present invention provide an audio signal coding and decoding method and device. The coding method includes: dividing a frequency band of an audio signal into a plurality of sub-bands, and quantizing a sub-band normalization factor for each sub-band; determining a signal bandwidth for bit allocation according to the quantized sub-band normalization factors, or according to the quantized sub-band normalization factors and bit rate information; allocating bits for a sub-band within the determined signal bandwidth; and coding a spectrum coefficient of the audio signal according to the bits allocated for each sub-band. According to embodiments of the present invention, during coding and decoding, signal bandwidth for the bit allocation is determined according to the quantized sub-band normalization factors and bit rate information. In this manner, the determined signal bandwidth is effectively coded and decoded by centralizing the bits, and audio quality is improved.
1 citations
23 Aug 2007
TL;DR: Improving the Quality of Low Bitrate LPC Speech Codec Using Gamma-chirp Filterbank using Gamma- chirp filterbank is demonstrated.
Abstract: Improving the Quality of Low Bitrate LPC Speech Codec Using Gamma-chirp Filterbank
1 citations
Journal Article•
TL;DR: In this article, the authors present the software and hardware implementation of multi-channel AMR codec algorithm, which is achieved using TMS320C62xx DSP chip and describe the efficient software scheme for implementing AMR Codec and detailed hardware design.
Abstract: ETRI adopt AMR codec for developing the 3GPP based IMT-2000 system. This paper presents the software and hardware implementation of multi-channel AMR codec. The real-time implementation of AMR codec algorithm is achieved using TMS320C62xx DSP chip. We describe the efficient software scheme for implementing AMR codec and detailed hardware design. The multi-channel AMR codec is evaluated and confirmed in 3GPP test sequences, stand-alone test system and ETRI IMT-2000 prototype system.
1 citations
Patent•
01 Feb 2016TL;DR: In this paper, an audio signal coding method and apparatus is described, which includes categorizing audio signals into high-frequency audio signals and low-frequency signals, and coding the lowfrequency signals by using a corresponding lowfrequency coding manner according to the characteristics of lowfrequency signal.
Abstract: The present invention relates to an audio signal coding method and apparatus. The method includes: categorizing audio signals into high-frequency audio signals and low-frequency audio signals; coding the low-frequency audio signals by using a corresponding low-frequency coding manner according to characteristics of low-frequency audio signals; and selecting a bandwidth extension mode to code the high-frequency audio signals according to the low-frequency coding manner and/or characteristics of the audio signals.
1 citations
27 Feb 2006
TL;DR: The analysis mainly focuses on the complexity of spatial audio cue analysis and synthesis, especially for the additional special tools used during the spatial cue synthesis stage.
Abstract: This paper presents a complexity analysis of a spatial audio coding scheme (known as MPEG surrounding) based on a commercially available programmable device. The analysis mainly focuses on the complexity of spatial audio cue analysis and synthesis, especially for the additional special tools used during the spatial cue synthesis stage. The analysis results can be a reference during building up a SAC codec on a DSP.
1 citations