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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Proceedings Article•
18 Jul 1989
TL;DR: A single chip video picture motion estimator that operates upon a CIF specification video frame and provides motion vectors for (8*8) pixel blocks for displacements of up to +or-16 pixels and which can be cascaded for (16*16) block operation.
Abstract: Motion estimation is a key function in a video codec intended for use with low bit rate data transmission. Motion compensated codecs have received much attention in the literature recently since they provide a means by which high picture quality can be achieved with an economic bandwidth. This paper describes a single chip video picture motion estimator that operates upon a CIF specification video frame and provides motion vectors for (8*8) pixel blocks for displacements of up to +or-16 pixels and which can be cascaded for (16*16) block operation. The very close match between function, algorithm and architecture has allowed significant processing power to be implemented on a single chip. >
3 citations
Journal Article•
3 citations
01 Aug 2011
TL;DR: This document provides specific requirements for an Internet audio codec that address quality, sampling rate, bit-rate, and packet loss robustness, as well as other desirable properties.
Abstract: This document provides specific requirements for an Internet audio
codec. These requirements address quality, sampling rate, bit-rate,
and packet loss robustness, as well as other desirable properties.
3 citations
10 Jan 2019
TL;DR: This document defines FLAC, which stands for Free Lossless Audio Codec, a free, open source codec for lossless audio compression and decompression.
Abstract: This document defines FLAC, which stands for Free Lossless Audio
Codec, a free, open source codec for lossless audio compression and
decompression.
3 citations
18 Nov 2004
TL;DR: WBSD (wideband bark spectral distance), a wideband speech codec quality measure based on a bark spectral Distance objective quality assessment method for narrow-band telephone speech is proposed.
Abstract: Recently, there have been many advances in the field of wideband (7 kHz) speech coding because of evolutions and new applications in high-quality communication systems. The paper proposes WBSD (wideband bark spectral distance), a wideband speech codec quality measure based on a bark spectral distance objective quality assessment method for narrow-band telephone speech. The frequency band expansion method and accurate loudness calculation are discussed in detail. The variable bit-rate codecs and packet loss are used to simulate the speech quality degradation on communication systems. Correlation analysis between WBSD and DMOS are examined in order to evaluate objective speech quality measures. The experimental results show that the correlation degree reached is more than 0.8 in informal tests.
3 citations