Patent ID: 8315411
Filing Date: 2012-11-20
Classification: H03G,H04R,H04S

Abstract:
1. A system for dynamically controlling the perceived volume of a stereo audio program including left and right channel signals, comprising: a dynamic volume control system configured and arranged so as to maintain a perceived constant volume level of the stereo audio program, wherein the dynamic volume control system includes a signal level sensor for sensing the average level of the sum of the left and right channel signal levels; and a signal averaging block configured and arranged for providing an attack time and a release time resulting in signal compression in accordance with a compression ratio, wherein the signal averaging block is further configured so as to compute, and provide as an output signal for a gain value to be applied to the left and right channel signals, an average (AVG) of a reference (REF) signal relative to the attack and release times, wherein the reference (REF) signal represents the volume level of the input signal relative to a desired listening threshold; and an excessive spatial processing protection processor configured and arranged for controlling the level of a difference signal, created as a function of the right channel signal subtracted from the left channel signal (L−R), relative to the level of a sum signal, created as a function of the right channel signal plus the left channel signal; wherein the excessive spatial processing protection processor processes the audio signals so as to control the difference (L−R) signal relative to the sum (L+R) signal.