Description: This ETSI TETRA codec.It enable intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include: -speech coding -FEC, CRC, interleaving -protocol amendment inter-system interface. （ 还有配套的两个包）-This ETSI TETRA codec.It enable Intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include :-speech coding - FEC. CRC, interleaving-protocol amendment inter-system interface. (also supporting two packages) Platform: |
Size: 34615 |
Author:黄羽翔 |
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Description: This ETSI TETRA codec.It enable intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include: -speech coding -FEC, CRC, interleaving -protocol amendment inter-system interface. （ 还有配套的两个包）-This ETSI TETRA codec.It enable Intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include :-speech coding- FEC. CRC, interleaving-protocol amendment inter-system interface. (also supporting two packages) Platform: |
Size: 34816 |
Author:黄羽翔 |
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Description: Digital Speech:Coding for Low Bit Rate Communication Systems Second Edition
经典语音编码书籍-Digital Speech: Coding for Low Bit Rate Communication Systems Second Edition classic speech coding books Platform: |
Size: 8531968 |
Author:计算机 |
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Description: 关于语音处理的英文书籍，其中特征提取部分（MFCC）讲解的很好很详细-The performance of speech recognition systems receiving speech that has been transmitted over mobile channels can be
significantly degraded when compared to using an unmodified signal. The degradations are as a result of both the low
bit rate speech coding and channel transmission errors. A Distributed Speech Recognition (DSR) system overcomes
these problems by eliminating the speech channel and instead using an error protected data channel to send a
parameterized representation of the speech, which is suitable for recognition. The processing is distributed between the
terminal and the network. The terminal performs the feature parameter extraction, or the front-end of the speech
recognition system. These features are transmitted over a data channel to a remote "back-end" recognizer. The end result
is that the transmission channel does not affect the recognition system performance and channel invariability is achieved. Platform: |
Size: 101376 |
Author:gqy |
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Description: 本文提出了一种利用MBE 模型改进的低速率LPC 语音编码算法文中介绍了该算法
的参数提取量化编码及语音合成的具体方案并用C 语言构造了一个基于该算法的速率
为1.6kb/s 的语音编码/解码系统主观测听表明该系统性能与2.4kb/s 的MELP 算法接近
或相当-In this paper, a LPC algorithm in low bit rate speech coding improved by MBE model
is presented. The detailed schemes of parameter extraction, quantization, coding, and speech
synthesis are introduced. In addition, a 1.6kb/s speech coding/decoding system based on this
algorithm is constructed with language C. By subjective evaluation, it is concluded that the
performance of this system approaches or corresponds to that of 2.4kb/s MELP algorithm. Platform: |
Size: 451584 |
Author:lu |
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Description: Speech compression using Linear Predictive Coding.
LPC is the oldest and the most basic of modern speech coders. Its a lossy scheme. Playback quality isn t preserved in the process but it can be used in low bit-rate systems. Platform: |
Size: 234496 |
Author:Ed |
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Description: Chapter 2 Low Bit-Rate Speech Coding
In this chapter an overview is given of speech coding techniques at several bit rates. Most
of them use Linear Prediction. This overview is not meant to be complete its purpose is
to make the reader somewhat familiar with Linear Predictive Coding which is necessary for
a proper understanding of later chapters. Section 2.1 treats the subject of quantisation and
coding. In section 2.2 a description of speech production and speech sounds is given. Coders
based on linear prediction can be considered as being based on a simple speech production
model. This model is explained in section 2.3. Section 2.4 describes various speech coding
algorithms and techniques. Section 2.5 briefly describes some measures for the quality of
coded speech.-In this chapter an overview is given of speech coding techniques at several bit rates. Most
of them use Linear Prediction. This overview is not meant to be complete its purpose is
to make the reader somewhat familiar with Linear Predictive Coding which is necessary for
a proper understanding of later chapters. Section 2.1 treats the subject of quantisation and
coding. In section 2.2 a description of speech production and speech sounds is given. Coders
based on linear prediction can be considered as being based on a simple speech production
model. This model is explained in section 2.3. Section 2.4 describes various speech coding
algorithms and techniques. Section 2.5 briefly describes some measures for the quality of
coded speech. Platform: |
Size: 446464 |
Author:阿铁 |
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Description: 用线性预测编码进行语音压缩 - Speech compression using Linear Predictive Coding-LPC is the oldest and the most basic of modern speech coders. Its a lossy scheme. Playback quality isn t preserved in the process but it can be used in low bit-rate systems. Platform: |
Size: 295936 |
Author:张盛浩 |
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Description: 低码率语音编码MELP1200的编解码过程，有效降低了语音编码码率并能使说话者个人语音特征减弱，特别适合需要弱化说话者语音特点的场合-MELP1200 low bit rate speech coding and decoding process, effectively reducing the bit rate speech coding and to make personal voice characteristics of the speaker weakened, especially for those who need to weaken the voice features of the occasion to speak Platform: |
Size: 1050624 |
Author:杨亚欣 |
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Description: Overview of voice coding techniques, fundamentals of speech processing for speech coding, Standard voice coding techniques, MELP implementation, The temporal Decomposition approach to voice coding, Implementation of an Irregular frame rate vocoder, Evaluation of vocoders, etc. Platform: |
Size: 1966080 |
Author:Co |
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Description: Low bit-rate speech coders are important in many critical communication systems such as military, police, fire departments, homeland security and other first responders. The need for elimination, reduction of the redundancy or irrelevant information from the analog signals gave birth to an area of speech coding. The main goal of speech coding is to represent speech with the minimum number of bits by maintaining its intelligibility and perceptual quality. In today’s wireless communication system there are many factors to be considered but the most constraint is the bandwidth and power. Accommodating more users within a limited bandwidth is a big challenge in the mobile communication system. Still the manufactures and service providers are in search for the low bit-rate speech coders that deliver toll quality speech. The objective of this paper is to compare the commonly used algorithms in wireless communication systems such as LPC, PCM, ADPCM, CELP and VSELP. Platform: |
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Author:Ambika |
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Description: Linear-Predictive-Coder
MATLAB Implementation of LPC algorithm for speech signal
# Why LPC?
In communication systems it is often necessary to transmit audio(speech) signal in compressed or encoded form because of bandwidth limitation of the channel. In this regard, ‘Linear predictive coding(LPC)’ is an effctive method of speech coding at a low bit-rate.
# Features
** Analysis/Encoding phase,Synthesis/Decoding phase.
**Human voice modelled with all-pole filter.
** LPC parameters(filter coefficients, pitch, gain etc) extraction at the decoding phase.
** Non-overlapping frames of 30 milliseconds in duration
# How To Run
** Make sure MATLAB(latest version) is installed
** Put both files(LPC.m with .mp3 file) in the same folder
** Open LPC.m file and run it.
## Comments
Different audio (.mp3) files can be coded/decoded by changing the input file name in the code. Platform: |
Size: 2048 |
Author:japaoli |
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Search - low bit rate speech coding