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Audio Tool features:
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uses two types of compression: GSM 06.10 speech codec and Intel/DVI ADPCM codec
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GSM codec offers better compression ratio but worse speech quality - it is good for less reliable networks
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ADPCM compresses audio just four times but it has much better quality
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GSM 06.10 codec
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used in digital cellular telephony standard
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based on the RPE-LTP compression algorithm
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Intel/DVI ADPCM codec
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less computionally intensive than G.721
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produces very good quality for voice signals and reasonably good quality for music
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