It's amplitude spectrum in the linear domain.
Heiga
2013/01/28 7:59 "北语语音组成员李伟" <blculiwei@xxxxxxxxx>:Hi, allRecently, I used straight(matlab version) to extract spectrum envelope from speech wave, for one frame, I draw a picture using 'plot', I am confused what y-axis stands for, what's the unit of y-axis, obviously, it's not DB,the x-axis stands for frequency.the more details you can check my picture in the attachment!Look forward your suggestions!Thanks!Li weiDepartment of Information Science, Beijing Language and Culture University
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