Speech coding apparatus, speech decoding apparatus, speech codin

Details Speech coding apparatus, speech decoding apparatus, speech codin Speech coding apparatus, speech decoding apparatus, speech codin

1995-10-26

1998-03-03

MacDonald, Allen R.

395 229, G10L 302, G10L 900

Patent

active

057244804

ABSTRACT:
A speech coding and decoding apparatus for improving the quality of synthesized speech. A coding portion includes a filter for adding a short-term phase amplitude characteristic to an excitation signal, and a coding circuit for quantizing and coding a phase amplitude characteristic. A decoding portion includes a decoding circuit for decoding the coded phase amplitude characteristic, and a filter for adding the same phase amplitude characteristic as that in the coding portion. Thus, it is possible to synthesize high-quality speech with good reproducibility of the phase amplitude characteristic of an excitation signal.

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Schroeder & Atal "Code-excited linear prediction (CELP); High-quality speech at very low bit rates" ICASSP '85, pp. 937-940, 1985.
Moriya & Honda "Speech coder using phase equalization and vector quantization" ICASSP '86, pp. 1701-1704, 1986.
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Ikeda, Nakamura & Asada "Speech Coding Using All-pass Filter Response" Technical Reports of the Institute of Electronics, Information and Communication Engineers SP91-72, pp. 45-52, 1991.
Honda & Moriya "Speech Encoding Based on Phase Equalization" (Transactions of the Committee on speech Research. The Acoustical Society of Japan, S84-05, pp. 33-40, 1984.

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