Speech coding at very low bit-rates for mobile communication

被引：0

作者：

Gandhi, AG ^{[1
]}

Dhekane, SS ^{[1
]}

机构：

[1] Maharashtra Inst Technol, Dept Elect & Telecommun, Pune, Maharashtra, India

来源：

APCC 2003: 9TH ASIA-PACIFIC CONFERENCE ON COMMUNICATION, VOLS 1-3, PROCEEDINGS | 2003年

关键词：

parametric coding; waveform interpolative coding; speech enhancement; quantization; post-filtering; pitch search..;

D O I：

10.1109/APCC.2003.1274375

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

We, in this paper discuss the various basic speech coding techniques viz. Waveform coding, Parametric coding and the Quantization schemes and review the 'Enhanced Waveform Interpolative Coding' technique in detail. The EWI coding technique for. Low bit rates with several enhancements. like Analysis by Synthesis (AbS) optimization of Slowly Evolving Waveform (SEW), Rapidly Evolving Waveform (REW) parametrization, REW quantization, etc. proves to be very efficient for mobile communications. Also briefed are an enhanced Post-Filtering and a. novel Pitch Search technique for speech enhancement The subjective test results have indicated that the quality of the 2.8 Kb/s EWI exceeds that of the G.723.1 at 5.3 Kb/s. Based on the results, we conclude that speech coding low bit-rates especially the EWI coder has enormous vistas in future 4G Mobile systems, Internet Telephony, LEO systems, etc...

引用

页码：358 / 362

页数：5