Title :
SNR analysis of log companding for use in a digital recording/data analysis system
Author_Institution :
GTE Products Corp., Needham, MA, USA
Abstract :
It is shown that analog log compression of a band-limited signal prior to A/D conversion can be used to compress a wide dynamic range signal and recover a sampled representation the original signal by inverse log compression of the log-compressed samples without introducing aliasing error. The accuracy of the overall companding function has been expressed analytically in closed form as an SNR measure of the decompressed sample sequence that characterizes the original (i.e. unprocessed) signal. A numerical example is given.
Keywords :
analogue-digital conversion; data compression; data reduction and analysis; SNR; analog log compression; analogue digital conversion; band-limited signal; data analysis system; digital recording; inverse log compression; Data analysis; Dynamic range; Equations; Quantization; Signal to noise ratio; Software;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1981.6312405
