Audio transmission in the video stream with adaptive gain

H - Electricity – 04 – N

Patent

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Details

H04N 7/04 (2006.01) H04N 5/60 (2006.01) H04N 7/08 (2006.01)

Patent

CA 2316384

An improved system for transmitting audio signals in a TV stream employs an adaptive gain system. The system provides for sampling the audio signal in each of successive intervals in between 256 (2 8) and 65,535 (2 16) steps, for determining a reference voltage (i.e. maximum or mean,..) amplitude for the interval, for dividing the signal into 256 steps, for providing a scaling factor for each of the steps which is a direct function of the reference voltage, and for transmitting the audio signal (interval) along with a code representative of the scaling factor to permit a receiver to faithfully reproduce the signal.

Ce système amélioré permettant la transmission de signaux audio dans un flot de données TV, est équipé d'un système de gain adaptatif. Ce système assure l'échantillonnage du signal audio dans chacun des intervalles successifs séparant 256 (2<8>) et 65 535 (2<16>) niveaux, afin de déterminer une tension de référence (tension maximale ou moyenne,...) pour l'intervalle, de diviser le signal en 256 niveaux, d'attribuer à chacun de ces niveaux un facteur d'échelle qui est une fonction directe de la tension de référence, et de transmettre le signal audio (intervalle) en même temps qu'un code représentant le facteur d'échelle afin de permettre une reproduction fidèle du signal par un récepteur.

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