弦音計 的英文怎麼說
中文拼音 [xiányīnjì]
弦音計
英文
monochord-
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。Point in the number of times of a repetition in period, or each of cycle number. calculate the unit to hz hertz, such as the frequency is 1000 hzs 1 khz signal 1000 every second then contain the cycle of the sine wave
指在一個周期內的重復次數，或每秒的周波數。計量單位為hz hertz ，如頻率為1000hz 1khz的音頻信號每秒便有1000個正弦波的周波。I has mainly discussed the sofeware and hardware of aribrary waveform generator controlled by the microcontroller in my with the control of the high proformance microcontroller - 80c196kc, this instrument builds up the main circuit adopting single tone and dac of ad9857. in my project, i. have designed some special circuits with the advanced method of eda ( electron design automation ) based on vhdl and cpld. it can produce standard waveforms such as sine, square, triangle, and generate aribrary waveform according to the user ' s demand, at the same time, it has the ability to produce the amplitude modulation signal based on the carrier of sine and the aribrary waveform
論文中主要對微機控制的任意波形發生器的軟硬體設計進行了相應的研究，該任意波形發生器以intel公司16位高性能單片機80c196kc作為控制器，分別利用了ad9857的單音頻模式和dac模式組成正弦波和任意波產生的電路，在硬體電路的設計中採用了先進的eda （電子設計自動化）技術，使用vhdl語言和可編程門陣列器件對一些特殊的電路進行了設計。Is in the one constructs 256 sounds string wave echo music ic, uses the entire bridge design technology direct drive loudspeaker
是一內建256音的弦波迴音音樂ic ，利用全橋設計技術直接驅動喇叭。分享友人