Patent ID: 9112464
Filing Date: 2015-08-18
Classification: H03G

Abstract:
1. A method for normalizing a power of an electrical signal or original sound signal, each of a plurality of channels being associated with an original sound signal, the method comprising the steps of: detecting an envelope of the original sound signal to obtain an envelope signal; comparing a power value of the envelope signal with a first threshold value to provide a comparison; calculating a gain signal in accordance with the comparison; smoothing the gain signal to obtain a smoothed gain signal; delaying the original sound signal by a delay to obtain a delayed original sound signal; saving a minimum value of the smoothed gain signal applied to the delayed original sound signal of a current channel during a channel change; wherein a value of the smoothed gain signal applied to the delayed original sound signal being equal, when a new channel is selected, to a sum of a dynamic gain value and a previously recorded minimum value of the smoothed gain signal or a static value; calculating the dynamic gain value from the comparison between the power value of the envelope signal of the channel subtracted from the power corresponding to the static value and the first threshold value; and applying the smoothed gain signal to the delayed original sound signal to obtain a normalized sound signal having a power close to the threshold value.