| 摘要 |
PURPOSE:To obtain the pitch converter of high quality for the digital audio signal which performs processing with small deterioration due to tremolo modulation, a phase shift, etc., by enabling continuation by cross-fading at the highest- correlation position obtained by a correlation detecting means. CONSTITUTION:An input signal is written and stored in a RAM 1 according to the write address given from a write address counter 4. The correlation detecting circuit 2 finds cross-fading sections before and behind an editing point and correlation nearby a temporary editing point from the signal stored in the RAM 1 to detect the position where the highest correlation is obtained, regards the position as an editing point, and sends the length of a section where compression is performed with the difference between both the editing points to an adder 6. Thus, the cross-fading is performed at the position of the highest correlation to make a connection. Consequently, attenuation due to a difference in phase is eliminated in the cross-fading section to prevent the tremolo modulation. |
