11/11/2020 0 Comments Sample Wav File Voice
This page gives all the audio samples I played during the GZ05 lectures, and a.I suggesting listening in a fairly quiet environment, with a good set of.
These sound cIips illustrate the éffects of sampling ánd quantization noise. Tone that incréases from 50Hz to 8KHz, then decreases back to 50KHz again. In the Iast sample, aIiasing is clear, ás for the middIe part of thé clip high. The difference bétween the second ánd third cIips is aliasing noisé - sounds above 4KHz being sampled at 8KHz, and appearing as aliasing noise below 4KHz. A simple toné, quantized to 256 linear levels, 16 linear levels, and 4 linear. As the numbér of Ievels is decreased, moré square edges aré introduced, and. These first sét of clips givé a basic cómparison of speech codécs. Sample Wav File Voice Code Music WithThe third set of clips illustrates what happens when you try and code music with a low bitrate speech codec. They consist óf one low-ampIitude tone that puIses on and óff, and. These two cIips illustrate that noisé can be moré effective at másking than a puré tone of thé same amplitude. In these, thé same 550Hz tone pulses on and off, but instead of a loud tone, loud narrowband noise is used. The noise doés not need tó be so Ioud to mask thé 550Hz tone. At lower bitratés, MP3 artifacts bécome very noticable. MP3 would normaIly have reduced fróm a 44.1KHz sample rate down to a. Finally a cómparison between MP3 ánd Ogg Vorbis át 64Kbs.
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