Data from: Van Son R.J.J.H., "CAN STANDARD ANALYSIS TOOLS BE USED ON DECOMPRESSED SPEECH?", CoCOSDA 2002 meeting (Denver)

and the slides

Testing Sony Minidisk (MZ-R909), Ogg Vorbis (1.0 rc3), and MP3 (LAME 3.92)

Analysis of (de-)compressed speech

Browse (and download) the speech and analysis files


Full praat and perl scripts used


Original Database Queries (Raw Data)

The following queries extract mean/standard deviation (RMS error)'s of the difference (in semitones) between measurements on the Original (audio-cd) recordings and identical measurements on Compressed/Decrompressed versions of these recordings for two microphones (see below). The differences are compared (the Microphone button) with the effect of a change in recording conditions, i.e., the difference between the measurements on recordings using a fixed HF condenser microphone (Sennheiser MKH 105) and those on the parallel recording using a head-mounted dynamic microphone (Shure SM10A).

Difference measures of F0-F3 exclude large jumps (+/- 9 semitones).

F0

Mean F0 (semitone) difference and standard deviation (RMS error), excluding jumps, between Original and Compressed/Decompressed sonorants grouped by Manner of Articulation and Speaker sex.

F1

Mean F1 (semitone) difference and standard deviation (RMS error) excluding jumps between Original and Compressed/Decompressed vowels grouped by Vowel and Speaker sex.

F2

Mean F2 (semitone) difference and standard deviation (RMS error) between Original and Compressed/Decompressed vowels grouped by Vowel and Speaker sex.

F3

Mean F3 (semitone) difference and standard deviation (RMS error) between Original and Compressed/Decompressed vowels grouped by Vowel and Speaker sex.

Center of Gravity (first spectral moment)

Mean CoG (semitone) difference and standard deviation (RMS error) between Original and Compressed/Decompressed vowels, fricatives, glides, and nasals grouped by Manner of Articulation and Speaker sex.

Other measurements

F1/F2 vowel space