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논문 기본 정보

자료유형
학술저널
저자정보
Byeong-Gwan Iem (Gangneung-Wonju National University)
저널정보
한국지능시스템학회 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGENT SYSTEMS INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGENT SYSTEMS Vol.19 No.2
발행연도
2019.6
수록면
129 - 133 (5page)
DOI
10.5391/IJFIS.2019.19.2.129

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초록· 키워드

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A fixed rate speech coder exploiting the filter bank with non-uniform bandwidth is proposed. The speech coder is based on the inflection point (IP) detection. The speech signal is filtered by a group of bandpass filters with non-uniform bandwidths. Each bandpass filtered signal is processed by the IP detector, and the obtained IP pattern is compared with the entries of the IP pattern database. To facilitate the database search, the IP pattern entries are grouped into two kinds: IP patterns for voiced and the unvoiced speech. Before the search, the obtained IP patterns are checked if they belong to the voiced or the unvoiced. For that purpose, the shorttime energy of IP pattern from the first band is calculated and compared to the predetermined threshold value. In addition to the unvoiced/voiced decision, the non-uniform bandwidth bandpass filters are used for the filter bank to speed up the database search. By using the non-uniformly spaced bandpass filters, the number of filters in the filter bank becomes smaller. Transmitted information for each subband includes the IP pattern address of the database and amplitude of each IP pattern. In the receiver, the decoder recovers the subband signals using the received addresses and the energy information, and reconstructs the speech via the filter bank summation. Through computer simulation, the usefulness of the proposed technique is confirmed. The SNR performance of the proposed method is approximately 9 dB with relatively low bitrate of 12.8 kbps.

목차

Abstract
1. Introduction
2. Definition of Inflection Points and Their Detection
3. The Structure of the Speech Coder
4. The Short-Time Statistics of the Inflection Points for the Voiced/Unvoiced Decision
5. Simulation Results
6. Conclusion
References

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