in-core detector 中文意思是什麼
in-core detector
解釋
堆芯內探測器-
Section ii describes the design approach and implementation of speech module on mcf5249 coldfire core. the speech codec optimizes g. 729a codes and added voice activity detection of g. 729b to save bandwidth ; the implementation of acoustic echo cancellation uses nlms algorithm and it can reduce echo though designing adaptive fir filter and speech detector ; the dtmf and cpt generate signal using two second order digital sinusoidal oscillators and detect signal by picking up the frequency information. but only get the frequency information is not enough in cpt detector, this thesis introduces a method
其中對語音編解碼器的設計採用優化g . 729a代碼達到設計要求，並在此基礎上加入g . 729b的靜音檢測模塊，以進一步降低網路傳輸帶寬;對回聲消除器的設計採用nlms演算法，通過設計自適應fir濾波器和語音檢測器達到回聲消除目的;對雙音多頻設計，信號發生端採用構造靜態參數表並通過二階正弦振蕩器產生信號，信號檢測端提取頻率信息以檢測信號;對呼叫進程音設計，除了類似雙音多頻的信號發生及頻率檢測設計外，還需要檢測信號持續時間，作者設計了一種基於匹配狀態表的方法以檢測信號持續時間。 -
1. a small and cheap 8 - bit microcontroller is used as control core. all components of the sensor, some of which are necessary for the multiple and intelligent functions, are selected ones with low cost and small package. by designing all auxiliary logic circuits in a complex programmable logic device ( cpld ), and integrating all analog circuits in an application specific ic ( asic ), the size of pcb board is greatly reduced, which make it possible that the pcb can be installed with the displacement detector together
系統採用小型廉價8位微控制器控制，電路內配置了為實現多功能智能化所必需的硬體，並全部採用低價格、小體積器件，還將所有輔助邏輯電路設計在一片復雜可編程邏輯器件cpld內，所有模擬電路集成於一片專用集成電路asic內，大大縮小了電路板尺寸，再與傳感元件組裝在一起，從而使整個系統在保證智能化功能的前提下，具有體積小、成本低、一體化和抗干擾能力強的特點。
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