Switched adaptive quantiser for speech compression based on optimal companding and correlation

V. Despotovic*, Z. Peric, L. Velimirovic, V. Delic

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)


This study describes a novel adaptive quantiser based on the optimal companding technique. Adaptation is achieved by adjusting the input of the fixed or non-adaptive quantiser according to the estimated and quantised gain on each particular frame. In such a way better quantiser adaptation to the varying input statistics is provided. Selection of the appropriate bit rate is performed depending on the value of the correlation coefficient ρ on each frame. The decision thresholds for ρ are determined under the condition that the signal to quantisation noise ratio does not drop under 34.3 dB, satisfying the G.712 standard quality of speech, while decreasing the bit rate. The information about the gain and about the chosen bit rate is then transferred as a side information to a decoder. Although this slightly increases the side information, the overall savings in the bit rate have shown to be substantial. Theoretical and experimental results are provided, which point out the benefits that can be achieved using the proposed algorithm.

Original languageEnglish
Pages (from-to)701-707
Number of pages7
JournalIET Signal Processing
Issue number7
Publication statusPublished - Oct 2011
Externally publishedYes


Dive into the research topics of 'Switched adaptive quantiser for speech compression based on optimal companding and correlation'. Together they form a unique fingerprint.

Cite this