关于失真的问题

飞过海

我自制的6n8p前级，一级共阴放大直偶阴极输出，经试听未发现大问题，就是声音有点硬，今天测试了信噪比75db，失真不知怎么算，请大家帮忙！测信号发生器失真0.07 （设Ci），前级失真0.052（Ki），请问失真K为多少？<img src="attachments/dvbbs/2005-10/20051027174954137.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/20051027174954137.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><img src="attachments/dvbbs/2005-10/2005102717502076.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/2005102717502076.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Julien

飞过海

Julien

通常测试频率是400Hz