Audio 关键字以及示意图
Acoustic Echo Cancellation（AEC）
AEC is an essential part of providing speech enhancement (or voice quality enhancement) to any telephone communication. An acoustic echo canceller (AEC) operates on the digitally sampled audio signals of the communication device. The transfer function of the acoustic environment from the loudspeaker to the microphone on the device is estimated to cancel the received echoes from the microphone signal
SNR:(Signal-to-noise Ratio)
信噪比(訊噪比)，是科学和工程中所用的一种度量，用于比较所需信号的强度与背景噪声的强度。其定义为信号功率与噪声功率的比率，以分贝（dB）为单位表示。大于比率1:1（高于0分贝）表示信号多于噪声
Far End and Near End
Double Talk (DT) ：
Near end talker and Far end talker are talking at the same time
Far-Field Pickup (FFP) ：
enhancing weak microphone input
Bright Voice Enhancement (BVE):
Ambient noise cued receive path speech enhancement
Direction-Of-Arrival, DOA
incorporating voice pitch and sound location
NS:
stationary ambient noise suppress