The detector has a pair of filters (2) with predetermined cut off frequency for detecting the pitch of an input electric oscillating signal. The amplitude level of the input electric oscillating signal is detected and the attenuation level is measured. Based on the detected pitch level, the attenuation level of the envelope signal waveform is controlled.
申请公布号
DE19709930(A1)
申请公布日期
1997.11.13
申请号
DE1997109930
申请日期
1997.03.11
申请人
YAMAHA CORP., HAMAMATSU, SHIZUOKA, JP;BLUE CHIP MUSIC GMBH, 56283 HALSENBACH, DE