Thursday, February 23, 2012

PESQ and its implementation in Octave/Matlab

PESQ stands for ‘Perceptual Evaluation of Speech Quality’ and is an enhanced perceptual measurement for voice quality in telecommunications. If you want a Mean Opinion Score value (or MOS), then PESQ will give it to you. The new PESQ option will be especially relevant for engineers working in telecom, handsets, and handsfree accessories. Because it becomes standard in telecommunication industry, it is very important to measure of speech processing output with this standar. A figure of overview of PESQ system can be seen in Fig.1.

Fig. 1 : Overview of PESQ System[ [1]
Perceptual audio tests measure how people perceive sound quality. While useful for evaluating both small differences in high-quality music, and larger differences in lower-quality voice material, this article focuses on doing the latter using PESQ (Perceptual Evaluation of Speech Quality).

Friday, February 17, 2012

DSEE Sony Vs DNSe Samsung

DSEE (Digital Sound Enhancement Engine) by Sony : Restore sounds back to original

Listen to the music like it was meant to be. Degraded sounds of compressed audio is now improved and the high frequency range restored, reproducing natural, high quality sounds as close to the original source as can be.  
Digital Sound Enhancement Engine (DSEE) is Sony’s originally developed audio bandwidth enhancement technology. DSEE is a technology to enhance the sound quality of compressed audio files by restoring high-range sound removed by the compression process.When original music source is compressed with MP3 (or AAC/WMA), high frequency part of music source will be lost. The technology of DSEE enables to restore high frequency part and reproduces high quality sound which is close to the original CD sound source. By activating the [DSEE(Sound Enhance)]feature, you can hear a rich and natural sound almost exactly like the original source. 

DSEE Technology

DNSe (Digital Natural Sound engine) by Samsung

DNSe or the Digital Natural Sound engine is a DSP audio enhancement technology developed by Samsung in 2003 and further on implemented throughout many of their product lineups - from TVs and DVD players to portable music players and lately - mobile phones.
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