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Validity of Bit Compressed Digital Voice Recordings for Spectrographic Analyses: Input for a Database, a Preliminary Test

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In the spectrographic analysis of voice exemplars, there is a question of the impact of commercially available compression schemes on the visual representation of the voice. Specifically, there is a question whether or not the codec reconstruction of the time-domain waveform might alter features of the wide-band spectrogram, including formant shape and position. This paper contributes a collection of comparative analyses of English speech exemplars that are recorded simultaneously via both linear and compression-based recording methods. G.723-encoded recordings (max 6.3kbps, used in IC-recorders and surveillance recording equipment) and the Sony Memory stick format using MSV LPEC-SP compression are evaluated.

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AES - Audio Engineering Society