針對目前使用的RS232接口數字化B超鍵盤存在PC主機啟動時不能設置BIOS,提出一種PS2鍵盤的設計方法。基于W78E052D單片機,采用8通道串行A/D轉換器設計了8個TGC電位器信息采集電路,電位器位置信息以鍵盤掃描碼序列形式發送,正交編碼器信號通過XC9536XL轉換為單片機可接收的中斷信號,軟件接收到中斷信息后等效處理成按鍵。結果表明,在滿足開機可設置BIOS同時,又可實現超聲特有功能,不需要專門設計驅動程序,接口簡單,成本低。
Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot, this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller,designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter, potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU, software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot, ultrasound specific functionality can be achieved at the same time, it does not require specially designed driver,the interface is simple and low cost.
Ma tla b 是當今使用最為廣泛的數學軟件,它具有相當強大的數值計算、數據處理、系統
分析、圖形顯示、甚至符號運算功能,是一個完整的數學平臺,但是它不能實現端口操作和
實時控制Borland C + +Builder是一種新穎的可視化編程語言,可方便實現交互界面、數據
采集和端口操作等,但是它在數值處理分析和算法工具等方面,效率遠遠低于Matlab語言
ITU-T G.729語音壓縮算法。
description:
Fixed-point description of commendation G.729 with ANNEX B Coding of Speech at 8 kbit/s using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) with Voice Activity Decision(VAD), Discontinuous Transmission(DTX), and Comfort Noise Generation(CNG).
結合單片機和M a t l a b 兩者的優點,基于事件驅動的中斷通信機制,提出一種Matlab 環境下PC 機與
單片機實時串行通信及數據處理的方法;完成單片機數據采集系統與PC 機的RS-232/RS-485 串行通
信及其通信數據的分析處理、文件存儲、F I R 濾波及圖形顯示;簡化系統開發流程,提高開發效率。
該方法已成功應用于一個P I C 1 6 F 8 7 6 單片機應用系統實例之中
This is GPS Acquisition..by Matlab, this file performs cold start acquisition on the collected "data". It
searches for GPS signals of all satellites, which are listed in field
"acqSatelliteList" in the settings structure. Function saves code phase
and frequency of the detected signals in the "acqResults" structure.