Selected for use MFCC and the difference and divided the characteristic parameter as phonetic recognition, to describe the non-linear characteristic of frequency of sense of hearing of ears of people.
选用美尔倒谱系数及其差分作为语音识别的特征参数，来描述人耳的听觉频率非线性特性。
Model DL-850 FM Three-Band Wireless earphone, It has functions to receive both AF and FM signals and can be used to accept hearing training instead of wire earphone in phonetic room.
DL- 850型调频三波段无线耳机不仅具有音频感应接收功能，还具有接收调频信号功能，该型号无线耳机还可以代替语音室有线耳机进行听力训练。
Model DL-850 FM Three-Band Wireless earphone, It has functions to receive both AF and FM signals and can be used to accept hearing training instead of wire earphone in phonetic room.
DL- 850型调频三波段无线耳机不仅具有音频感应接收功能，还具有接收调频信号功能，该型号无线耳机还可以代替语音室有线耳机进行听力训练。
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