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Method of adjusting the excitation pulse position in linear predictive speech coder
Method of adjusting the excitation pulse position in linear predictive speech coder
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机译:在线性预测语音编码器中调节激励脉冲位置的方法
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摘要
A method for positioning excitation pulses for a linear predictive coder (LPC) operating according to the multi-pluse principle, i.e. a number of such pulses are positioned at specific time points and with specific amplitude. The time points and the amplitudes are determined from the predictive parameters (ak) and the predictive residue signal (dk), by correlation between a speech representative signal (Y) and a composed synthesized signal (Y^^). This can provide all possible time positions for the excitation pulses within a given frame interval. According to the proposed method, the possible time positions are divided into a number (nf) of phase positions and each phase- position is divided into a number of phases (f). These phases are vacant for the first excitation pulse. When this pulse has been positioned, the phase determined for this pulse is denied to the following excitation pulses until all pulses in a frame have been positioned.
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