Open AccessDesign and implementation of a new digital automatic gain control
Author(s) -
Tisserand E.,
Berviller Y.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.1398
Subject(s) - automatic gain control , multiplier (economics) , field programmable gate array , computer science , loop gain , digital signal processing , discretization , digital filter , gate array , digital control , process gain , electronic engineering , filter (signal processing) , computer hardware , engineering , electrical engineering , bandwidth (computing) , code division multiple access , mathematics , telecommunications , amplifier , mathematical analysis , spread spectrum , voltage , economics , computer vision , macroeconomics
A new design method of an all‐digital automatic gain control easy to implement is described and tested. The discretisation of the instantaneous gain provides a recursive form that merges the exponential function with the level detection. The first proposed circuit is well adapted for a software implementation. It comprises a simple control loop and two multipliers. It does neither contain digital filter nor divider and its setting only requires a loop gain parameter. Some tests were conducted on real digital audio signals with a dynamic range of 80 dB and they validate this approach. Under some conditions, the second circuit can even be simpler since it requires only one multiplier. It is well adapted to an field programmable gate array (FPGA) implementation for high speed signal processing.