·ITU-T G.729的一個實現例子(包括附錄b的vod檢測等功能)-ITU-T g.729 example, include VOD detect of reference B, etc.文件列表(點擊判斷是否您需要的文件): g729b_v14 .........\acelp_co.c .........\basic_op.c .....
定點乘法器設計(中文)
運算符：
+ 對其兩邊的數據作加法操作; A + B
- 從左邊的數據中減去右邊的數據; A - B
- 對跟在其后的數據作取補操作，即用0減去跟在其后的數據; - B
* 對其兩邊的數據作乘法操作; A * B
& 對其兩邊的數據按位作與操作; A & B
# 對其兩邊的數據按位作或操作; A # B
@ 對其兩邊的數據按位作異或操作; A @ B
~ 對跟在其后的數據作按位取反操作; ~ B
<< 以右邊的數據為移位量將左邊的數據左移; A << B
$ 將其兩邊的數據按從左至右順序拼接; A $ B
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.
