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KMID : 0917520040110030165
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Journal of Speech Sciences
2004 Volume.11 No. 3 p.165 ~ p.172
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An Algorithm to Reduce the Pitch Computational Complexity Using Modified Delta Searching in G.723.1 Vocoder
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Min So-Yeon
Bae Myung-Jin
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Abstract
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In this paper, we propose the computational complexity reduction methods of delta pitch search that is used in G.723.1 vocoder. In order to decrease the computational complexity in delta pitch search the characteristic of proposed algorithms is as the following. First, scheme to reduce the computational complexity in delta pitch search uses NAMDF. Developed the second scheme is the skipping technique of lags in pitch searching by using the threshold value. By doing so, we can reduce the computational amount of pitch searching more than 64% with negligible quality degradation.
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KEYWORD
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delta pitch searching, vocoder, computational complexity, skipping technique
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