Audio quality of portable players
As perceived audio quality of portable players depends mostly on performance of their digital and analog hardware circuits, objective audio measurements are important. At SoundExpert such measurements are performed in accordance with the innovative, music-based audio metric, which:
• correlates well to perceived sound quality
• is understandable to people without technical background; more ►
• uses open source measurement software; more ►
• has simple and mature measurement procedure thanks to two years of beta testing with 30+ players; more ►
How audio quality is measured
Df-slides with measurement results
The audio measurements of portable players are shown in df-slides. One player - one slide. The most meaningful value on df-slide is histogram median, which is assumed to correlate well to perceived sound quality (the research is still in progress). The less the value, the higher playback fidelity. The opening map summerises such medians for all tested players.
<------------ Higher Fidelity
Df-slides below are sorted by histogram median. Top df-slides represent portable players with higher playback fidelity.back to map
back to map
How To Read Df-slides
The new audio metric has only one measurable parameter - the Difference Level (Df, dB) which measures degradation of an input signal waveform in a device under test. Input (reference) signals can be of any kind - sine, white noise, music, voice, etc. Df-slide shows such Df measurements with some basic technical signals and real-life audio material.
A set of resulting Df values is in fact an objective representation of so called sound signature or, to be more correct, artifact signature of a device.