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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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Journal Article
TL;DR: Results show this AMI/HDB3 codec is simple, low cost and runs stable, and has been used in practice.
Abstract: To design one hardware circuit of AMI/HDB3 codec implemented on IC CD22103 based on the principle of AMI/HDB3 codec.This paper analyzes the realization,uni-polar and bi-polar conversion,bit synchronous in detail.Lastly,experimental results are provided and the time delay of codec is analyzed.Results show this codec is simple,low cost and runs stable,and has been used in practice.

1 citations

Proceedings ArticleDOI
27 Aug 2007
TL;DR: A novel distortion measure for the low-band speech signal that takes phase information into consideration, with no increase in the bit-rate is introduced.
Abstract: Vector Quantization (VQ) has been extensively used in speech vocoders. Phase information is often ignored or coarsely represented in parametric coders because of the difficulties facing phase quantization. This paper introduces a novel distortion measure for the low-band speech signal that takes phase information into consideration, with no increase in the bit-rate. This measure has been used in the construction of a segmental vocoder, which is using the pitch period as segments. A description of the proposed Time-Domain PhaseAware (TDPA) distortion measure is given and compared to the use of the MFCC as a distortion measure showing the effect of the phase information represented in the TDPA model on improving the inter-frame correlation of the synthesized speech. Finally, the performance of the TDPA is evaluated using the Segmental Signal-to-Noise Ratio (SNR), and Spectral Distortion (SD). Speech quality is evaluated using the recently standardized objective quality measure PESQ.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202214
20201
20193
20183
201721