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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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Support for multicast
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Support for half-duplex sound cards
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GSM 06.10 codec
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Standard used in digital cellular telephony
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Based on the RPE-LTP compression algorithm
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Modem bitrates
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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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Bitrate: ~32 kpbs
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