Current Search: Castelluccia, Claude. (x)
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Title
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Missing speech packet reconstruction based on the short-time energy and the zero-crossings.
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Creator
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Castelluccia, Claude., Florida Atlantic University, Erdol, Nurgun
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Abstract/Description
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A waveform substitution technique using interpolation based on such slow varying parameters of speech as short-time energy and average zero-crossing rate is developed for a packetized speech communication system. The system uses 64 Kbps conventional PCM for encoding and takes advantage of active talkpurts and silence intervals to increase the utilization efficiency of a digital link. The short-time energy and average zero-crossing rates calculated for the purpose of determining talkpurts are...
Show moreA waveform substitution technique using interpolation based on such slow varying parameters of speech as short-time energy and average zero-crossing rate is developed for a packetized speech communication system. The system uses 64 Kbps conventional PCM for encoding and takes advantage of active talkpurts and silence intervals to increase the utilization efficiency of a digital link. The short-time energy and average zero-crossing rates calculated for the purpose of determining talkpurts are transmitted in a preceeding packet. Hence, when a packet is pronounced "lost", its envelope and frequency characteristics are obtained from the previous packet and used to synthetize a substitution waveform which is free of annoying sounds that are due to abrupt changes in amplitude. Informal listening tests show that tolerable packet loss rate up to 40% are achievable with these procedures.
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Date Issued
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1991
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PURL
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http://purl.flvc.org/fcla/dt/14704
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Subject Headings
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Packet switching (Data transmission), Speech processing systems
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Format
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Document (PDF)
