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Convention Paper

Design and Implementation of a Web-Based Software Framework for Real Time Intelligent Audio Coding Based on Speech/Music Discrimination

Authors: Garcia Galan, Sebastian; Muñoz Exposito, Jose Enrique; Ruiz Reyes, Nicolas; Vera Candeas, Pedro

AES Convention 122 · Paper 7005 · May 2007

Abstract

In this work a software framework based on client-server architecture is implemented for real time intelligent audio coding. A speech/music discrimination scheme analyzes the input audio signal and takes a decision about the nature of the audio signal (speech or music) on a frame by frame basis. According to the decision of the speech/music discriminator, a suitable coder is selected at each frame. The designed software framework makes use of the speech and audio coders incorporated into the MPEG4 audio standard (HVXC or CELP for speech frames and TwinVQ or AAC for music frames) to evaluate the performance of an intelligent multi-mode audio coder. The framework supports several types of audio features (timbral texture features and rhythmic content features) and classifiers (classical Statistical Pattern Recognition (SPR) classifiers, Multilayer Perceptron Neural Networks (MLPNN), Support Vector Machines (SVM), Fuzzy Expert Systems (FES), Hidden Markov Models (HMM)). Comparison between a speech/music discrimination based-intelligent audio coder and MPEG4-AAC has been performed using audio signals representative of the two corresponding classes (speech and music). Subjective and objective tests have been accomplished aiming at assessing the behaviour of the intelligent audio coding scheme.

Details

Published in
AES Convention 122
AES Convention
122
Paper number
7005
Publication date
May 6, 2007
Session subject
Low Bit-Rate Audio Coding
Affiliation
University of Jaen (See document for exact affiliation information.)
Type
Convention Paper