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A Study on 8kbps FBD-MPC Method Considering Low Bit Rate

Low Bit Rate을 고려한 8kbps FBD-MPC 방식에 관한 연구

  • Lee, See-Woo (Dept. of Information and Telecommunication Engineering, Sangmyung University)
  • 이시우 (상명대학교 정보통신공학과)
  • Received : 2014.04.02
  • Accepted : 2014.06.20
  • Published : 2014.06.28

Abstract

In a speech coding system using excitation source of voiced and unvoiced, it would be involved a distortion of speech quality in case coexist with a voiced and unvoiced consonants in a frame. In this paper, I propose a method of 8kbps Multi-Pulse Speech Coding(FBD-MPC: Frequency Band Division MPC) by using TSIUVC(Transition Segment Including Unvoiced Consonant) searching, extraction and approximation-synthesis method in a frequency domain. I evaluate the 8kbps MPC and FBD-MPC. As a result, SNRseg of FBD-MPC was improved 0.5dB for female voice and 0.2dB for male voice respectively. Compared to the MPC, SNRseg of FBD-MPC has been improved that I was able to control the distortion of the speech waveform finally. And so, I expect to be able to this method for cellular phone and smart phone using excitation source of low bit rate.

Keywords

Cellular Phone;Smart Phone;Internet Phone;Speech Coding;Coding System

References

  1. B.S.Atal and J.R.Remdo: "A New Medel of LPC Excitation for Producing Natural Sounding Speech at Low Bit Rates", IEEE,ICASSP, p614-617, 1982
  2. Z.A.Putnins, G.A.Wilson, J.Kumarand R.D.Trupp: "A Multi-Pulse LPC Synthesizer for Telecommunications use",IEEE,ICASSP,Mar,1985
  3. Kazunori OZAWA, Takashi ARASEKI: "Multi-Pulse Excited Speech Coding Utilizing Pitch Information at Rates Between 9.6 and 4.8 kbit/s", IEICE, Vol.J72-D-2, No.8, 1989
  4. Campbell,J.P.,Tremain,T.E.:"Voiced/unvoiced classification of speech with applications to the U.S.Government LPC-10e algorithm",Proc.IEEE Int.Conf. on Acoustics, Speech, Sinal Processing, p473-476. 1986
  5. Nobuhiko KITAWAKI, FumitadaI TAKURA and Shuzo SAITO: "Optimum Coding of Transmission Parameters in PARCOR Speech Analysis Synthesis System", IEICE, Vol. J61-A No.2, 1978
  6. K.Krishna, V.L.N.Murty, K.R.Ramakrishnan:"Vector quantization of excitation gains in speech coding", Signal Processing 81,p203-209, 2001 https://doi.org/10.1016/S0165-1684(00)00200-0
  7. Selma Ozaydm, Buyurman Baykal:"Matrix quantization and mixed excitation based linear predictives peech coding at very low bit rates", Speech Communication 41, p381-392, 2003 https://doi.org/10.1016/S0167-6393(03)00009-8