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.
Papers published on a yearly basis
Papers
More filters
01 Jan 2013
TL;DR: The main purposes of this research are to analyze and seek improvement in the quality of voices encoded using VoIP CODEC.
Abstract: Variety of compression algorithms of each VoIP CODEC makes the quality of the output files different. As voices may need to be encoded multiple times while being sent through multiple networks that use different CODEC (so called CODEC tandem), there is a possibility that the CODECs which provide low voice quality may be used together with others that provide much better voice quality. The main purposes of this research are to analyze and seek improvement in the quality of voices encoded using VoIP CODEC
01 Jan 2012
TL;DR: The improved method uses the autocorrelation algorithm to calculate the Linear Prediction (LP) coefficients and then the LP coefficients are employed to extrapolate new samples for replacing the look-ahead samples.
Abstract: an improved method is proposed to skip the look- ahead period in this paper. The improved method uses the autocorrelation algorithm to calculate the Linear Prediction (LP) coefficients and then the LP coefficients are employed to extrapolate new samples for replacing the look-ahead samples. To evaluate the quality of this method, perceptual evaluation of speech quality (PESQ) and the A/B listening test method are designed for the objective evaluation and subjective evaluation. The reconstructed quality of the modified method is near to the original AMR codec, at the same time, the delay of the improved method is lower 5ms than the original method.
14 Oct 1996
TL;DR: A general video codec is designed and implemented using generalized subband decomposition, vector quantization with variable bit allocation and motion compensation, capable of encoding color video in the QCIF format at 15.2 kbit/s and ten frames per second.
Abstract: A general video codec is designed and implemented using generalized subband decomposition, vector quantization with variable bit allocation and motion compensation. The resulting codec is capable of encoding color video in the QCIF format at 15.2 kbit/s and ten frames per second. Simulation results are presented and compared with other video coding methods, such as the H.261 and MPEG standards.
TL;DR: This letter introduces the implementation of H.263 video codec based on multimedia DSP TM1300, and discuses several key problems related to video coding.
Abstract: This letter introduces the implementation of H.263 video codec based on multimedia DSP TM1300, and discuses several key problems related to video coding.