发明名称 VOICE ENCODER
摘要 PURPOSE: To adjust pulse width with a small arithmetic quantity and obtain superior encoded speech quality by correcting the levels of the pulse having the maximum absolute value of an evaluation function among positions where previously found pulses rise and a newly found pulse. CONSTITUTION: A pulse search circuit 5 regards cross correlation found by a cross correlation arithmetic circuit 3 as a 2nd arithmetic means as an evaluation function and each time one of multipulses is newly determined, the level of the pulse at the time position where the absolute value of the evaluation function becomes maximum among the previously found pulses and the newly determined pulse are corrected. Then the value normalized to the size of correction of the pulse at the time position is subtracted from the value of autocorrelation at the time position where the absolute value of an evaluation function found from an autocorrelation arithmetic circuit 4 as a 3rd arithmetic means from the said evaluation function becomes maximum to find a new evaluation function. Further, a pulse following the newly determined is determined at the time position where the absolute value of the new evaluation function becomes maximum. Consequently, the quality of the encoded speech can be improved with a small arithmetic quantity.
申请公布号 JPS6459396(A) 申请公布日期 1989.03.07
申请号 JP19870217115 申请日期 1987.08.31
申请人 NEC CORP 发明人 FUKUI AKIRA
分类号 G10L19/04 主分类号 G10L19/04
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