A Novel Multi-Exponential Function-based Companding Technique for Uniform Signal Compression over Channels with Limited Dynamic Range

Authors

Taleb Moazzeni, University of Nevada, Las VegasFollow
Henry Selvaraj, University of Nevada, Las VegasFollow
Yingtao Jiang, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

9-16-2010

Publication Title

International Journal of Electronics and Telecommunications

Volume

56

Issue

2

First page number:

125

Last page number:

128

Abstract

Companding, as a variant of audio level compression, can help reduce the dynamic range of an audio signal. In analog (digital) systems, this can increase the signal-to-noise ratio (signal to quantization noise ratio) achieved during transmission. The μ-law algorithm that is primarily used in the digital telecommunication systems of North America and Japan, adapts a companding scheme that can expand small signals and compress large signals especially at the presence of high peak signals. In this paper, we present a novel multi-exponential companding function that can achieve more uniform compression on both large and small signals so that the relative signal strength over the time is preserved. That is, although larger signals may get considerably compressed, unlike μ-law algorithm, it is guaranteed that these signals after companding will definitely not be smaller than expanded signals that were originally small. Performance of the proposed algorithm is compared with μ-law using real audio signal, and results show that the proposed companding algorithm can achieve much smaller quantization errors with a modest increase in computation time.

Keywords

Algorithms--Data processing; Data compression (Telecommunication); Digital communications; Signal processing

Disciplines

Computer Engineering | Digital Communications and Networking | Electrical and Computer Engineering | Electrical and Electronics | Signal Processing | Systems and Communications

Language

English

Permissions

Use Find in Your Library, contact the author, or use interlibrary loan to garner a copy of the article. Publisher copyright policy allows author to archive post-print (author’s final manuscript). When post-print is available or publisher policy changes, the article will be deposited

Repository Citation

Moazzeni, T., Selvaraj, H., Jiang, Y. (2010). A Novel Multi-Exponential Function-based Companding Technique for Uniform Signal Compression over Channels with Limited Dynamic Range. International Journal of Electronics and Telecommunications, 56(2), 125-128.