Earticle

초록

영어

Today, the primary constrain in wireless communication system is limited bandwidth and power. Wireless systems involved in transmission of speech envisage that efficient and effective methods be developed (bandwidth usage & power) to transmit and receive the same while maintaining quality-of-speech, especially at the receiving end. Speech coding is a technique, since the era of digitization (digital) and computerization (computational and processing horsepower - DSP) that has been a material- of- research for quite sometime amongst the scientific and academic community. Amongst all elements of the communication system (transmitter, channel and receiver), transmission channel (carrier of information/data, also called the medium) is the most critical and plays a key role in the transmission and reception of information/data.
This paper proposes some modifications in the Long Term Gain and selection of Grid position sections of 13kbps GSM Full Rate coder so that it can be mapped to bitrates of GSM Enhanced Full Rate at12.2kbps. Here, Objective analysis is carried out on a proposed system using MATLAB to evaluate its performance and the results obtained are then compared to the results of GSM Full Rate coder. Proposed coder, at bitrates of 12.2 kbps, provides moderately low computational complexity [1] as its implementation is with reference to GSM full rate coder rather than using Algebraic Code Excited Linear Prediction (ACELP) algorithm in case of standard GSM EFR coder but it offers small degradation in speech quality compared to standard GSM EFR coder. In comparison with standard GSM Full Rate coder, here the proposed coder offers other benefit of saving of 0.8kbps which can be useful for better error protection during channel coding while also provides satisfactory results for the parameters of Objective analysis.

목차

Abstract
 1. Introduction
 2. GSM Full Rate Encoder
 3. GSM Full Rate Decoder
 4. Proposed Modification in GSM Full Rate Speech Coder
 5. Objective Analysis
  5.1. Waveform based Objective Analysis
  5.2. Perceptual and based Objective Analysis and Composite measure
  5.3. Spectral based Objective Analysis
 6. Performance Evaluation of Proposed GSM EFR Coder
 7. Concluding Remarks
 8. References

키워드

저자

• Ninad Bhatt [ Research Scholar, Veer Narmad South Gujarat University, Surat, Gujarat, India ]
• Yogeshwar Kosta [ Principal, Marwadi Education Foundation, Rajkot, Gujarat, India ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Signal Processing, Image Processing and Pattern Recognition

• 간기

  격월간

• pISSN

  2005-4254

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605