Name
Abstract | ||
|---|---|---|
Motivated by the rapid increase of VoIP services with G.711 for telephone speech, a new ITU-T recommendation, G.711.0 (frame-wise stateless lossless compression scheme for G.711 log PCM symbols), has been standardized. The standard scheme has several coding parts, each of which is adaptively selected depending on the characteristics of the input. Among them, the mapped domain prediction part is the one most frequently activated for normal speech signals. This part consists of linear prediction in the mapped domain and variable length coding of the prediction residual. It is useful for log-compressed/expanded signal, such as ITU-T G.711. This paper describes three newly devised enhancement tools for the coding of prediction residual signals: progressive order prediction, quantized prediction order, and adaptive and sub-frame base coding for separation parameters. The design criterion is the maximization of the averaged FoM (figure of merit) over frame lengths of 40, 80, 160, 240, and 320 samples. The first tool, progressive order prediction associated with the adaptive modification of the separation parameter for the first and second samples, enhances the compression ratio by 0.5 % with a negligible increase of the complexity. The second tool, quantized prediction order, improves the compression ratio by 0.2 % with even reduced complexity. The third tool, sub-frame base adaptive coding of separation parameters, gives a 0.2 % improvement in the compression ratio with comparable complexity. All three schemes are consistently and independently effective for improving the compression ratio, although the amount of improvement with each tool is small. At the same time, none of the tools have any significant impact on computational complexity. Therefore, all the devised tools improve the FoM and have been adopted in the mapped domain prediction part of the ITU-T G.711.0 standard. |
Year | DOI | Venue |
|---|---|---|
2010 | 10.1109/DCC.2010.71 | Data Compression Conference |
Keywords | Field | DocType |
elementary coding tool,itu-t g.711,quantized order prediction tool,progressive order prediction tool,predictive coding part,average code length,g.711 log pcm symbol,lpc residual,compression performance,enhanced lossless,computational complexity,lossless coding,linear prediction,speech,variable length code,internet telephony,linear predictive coding,telegraphy,compression ratio,lossless compression,data compression,adaptive coding,speech coding,figure of merit | Tunstall coding,Speech coding,Coding tree unit,Computer science,Context-adaptive variable-length coding,Algorithm,Theoretical computer science,Speech recognition,Data compression,Variable-length code,Adaptive coding,Context-adaptive binary arithmetic coding | Conference |
ISSN | ISBN | Citations |
1068-0314 E-ISBN : 978-1-4244-6426-5 | 978-1-4244-6426-5 | 1 |
PageRank | References | Authors |
0.39 | 1 | 3 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Takehiro Moriya | 1 | 89 | 24.08 |
| Yutaka Kamamoto | 2 | 39 | 10.01 |
| Harada Noboru | 3 | 67 | 25.07 |