Analysis of Companding Techniques Applied to Onboard Telemetry Systems


Article Preview

In order to increase the dynamic range and the signal-to-quantization noise ratio (SQNR) of telecommunication systems, companding techniques were developed, such as the μ-law and the A-law. These techniques allow a non-uniform quantization of the signal using a compressor circuit followed by a uniform quantizer in the transmitter and the reconstruction of the original signal on the receiver by means of an expander circuit. Some types of signals monitored during the flight of sounding vehicles and satellite launchers have a very wide dynamic range. In this paper, we propose and analyze the use of companding techniques in order to improve the SQNR of onboard telemetry systems.



Edited by:

Amanda Wu




M. B. Lucks and H. A.C. Procópio, "Analysis of Companding Techniques Applied to Onboard Telemetry Systems", Applied Mechanics and Materials, Vol. 232, pp. 915-918, 2012

Online since:

November 2012




[1] S. Horan: Introduction to PCM Telemetering Systems. CRC Press, 2nd edition (May 29, 2002).

[2] A. B. Carlson, P. B. Crilly and J. C. Rutledge: Communications systems. McGraw Hill, 2002, 4th edition.

[3] B. Smith: Instantaneous Companding of Quantized Signals. The Bell System Technical Journal, may, (1957).

[4] G. K. Venayagamoorthy and W. Zha: Comparison of Nonuniform Optimal Quantizer Designs for Speech Coding with Adaptive Critics and Particle Swarm. IEEE Transactions on Industry Applications, vol. 43, No. 1, January/February (2007).


[5] N. S. Jayant: Digital Coding of Speech Waveforms: PCM, DPCM, and DM Quantizers. Proceedings of the IEEE, Vol. 62, No. 5, May (1974).


[6] R. Pirk, W. Desmet, B. Pluymers, P. Sas, and L. C. S. Goes: Vibro-acoustic Analysis of the Brazilian Vehicle Satellite Launcher (VLS) fairing. ISMA, (2002).