An LPC vocoder based on phase-equalized pitch waveform

Authors:
Yusuke Hiwasaki;Kazunori Mano;Takao Kaneko
Affiliations:
NTT Cyber Space Laboratories, NTT Corporation, 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-8585, Japan;NTT Cyber Space Laboratories, NTT Corporation, 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-8585, Japan;NTT Cyber Space Laboratories, NTT Corporation, 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-8585, Japan
Venue:
Speech Communication
Year:
2003

Citing 3
Cited 0

Vector quantization and signal compression

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Abstract

This paper presents a speech coder operating at a very low bit-rate using a model called "phase-equalized pitch waveform". The basic idea of the coder is to employ pitchwise extraction of the linear predictive residual signal, a pitch waveform, in voiced speech. The residual signal is processed with a phase-equalization filter to increase the efficiency of both the pitch waveform quantization and interpolation. Listening tests showed that efficient and high-quality coding is achieved at 2.0 kbits/s. The quality of the coder is equal to that of the DoD FS1016 standard CELP at 4.8 or 2.4 kbits/s MELP.