Topic
Enhanced Variable Rate Codec
About: Enhanced Variable Rate Codec is a research topic. Over the lifetime, 357 publications have been published within this topic receiving 4842 citations. The topic is also known as: EVRC.
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01 Mar 2013
TL;DR: This document specifies Real-time Transport Protocol (RTP) payload formats to be used for the Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW).
Abstract: This document specifies Real-time Transport Protocol (RTP) payload
formats to be used for the Enhanced Variable Rate Narrowband-Wideband
Codec (EVRC-NW). Three media type registrations are included for EVRC-
NW RTP payload formats. In addition, a file format is specified for
transport of EVRC-NW speech data in storage mode applications such as
email.
1 citations
01 Jun 1998
TL;DR: A 1.9 kbps Zinc-function excited, wave-form interpolated speech codec is proposed and its bit error sensitivity is analysed.
Abstract: A 1.9 kbps Zinc-function excited, wave-form interpolated speech codec is proposed and its bit error sensitivity is analysed. This codec is incorporated in a standard GSM-like system, employing either convolutional or turbo coding. Ironically, the higher complexity turbo codec provides only a modest robustness gain over the standard convolutional code due to the short interleaver constraint imposed by the highly bandwidth-efficient speech codec.
1 citations
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TL;DR: The main emphasis is placed on techniques that are likely to have applications in narrowband satellite communications, developing the theory as well as describing practical aspects of design and performance evaluations.
Abstract: This Chapter examines the development of efficient speech compression algorithms, with particular focus placed on new techniques developed over the past 10 years. The main emphasis is placed on techniques that are likely to have applications in narrowband satellite communications, developing the theory as well as describing practical aspects of design and performance evaluations.
TL;DR: A scalable -hybrid model of speech codec using ITU-T G.729 and db10 wavelet is presented that addresses the problem of compression of speech signal in VoIP setup and performs better than the standard codec.
Abstract: With the advent of various web-based applications and the fourth generation (4G) access technology, there has been an exponential growth in the demand of multimedia service delivery along with speech signals in a voice over internet protocol (VoIP) setup. Need is felt to fine-tune the conventional speech codecs deployed to cater to the modern environment. This fine-tuning can be achieved by further compressing the speech signal and to utilize the available bandwidth to deliver other services. This paper presents a scalable -hybrid model of speech codec using ITU-T G.729 and db10 wavelet. The codec addresses the problem of compression of speech signal in VoIP setup. The performance comparison of the codec with the standard codec has been performed by statistical analysis of subjective, objective and quantifiable parameters of quality desirable from the codec deployed in VoIP platforms.