Audio Codec

基于FPGA的数字系统设计,包含原理、工程应用和案例。(FPGA-based digital system design, including theory, engineering applications and cases.)

说明：  quartusii软件仿真实验代码 双二选一(quartusii software simulation code for a pair of two elections)

说明：  图片采用3x3均值滤波，用Verilog语言描述，输入输出分别使用外同步(Pictures are filtered with 3x3 mean and described in Verilog language. Input and output are synchronized with each other.)

原创：cos函数和sin函数的VHDL实现，很实用(cos of the VHDL implementation)

用DE0开发板实现电话计费器，基本功能：可设置通话模式，能初始化话费余额，拨动开关可进入通话模式，并根据通话时间和相应通话模式扣除相应的费用。通话过程中能够通过开关切换显示通话时间和话费余额，并可暂停通话。压缩包里有详细的WORD文档的说明，包括波形仿真和DE0的引脚功能介绍。(Implemented by DE0 board telephone billing, basic function: to set the call mode, you can initiate credit balance, toggle switch into the talk mode, and deduct the cost of a call based on call time and the corresponding mode. Call talk time and can be displayed by switching credit balance, and mute. Compression bag has a detailed description of WORD documents, including the waveform simulation and DE0 pin function description.)

高精度小数除法器设计与实现。 在FPGA开发板上实现小数除法器，输入输出信号N_in [15:0], D_in[15:0]，N_in[15:0]小于D_in，即被除数小于除数，输出商Q_out[15:0]中Q[15]一定为0，Q[14:0]为商的小数部分。输入和计算结果通过VGA显示。(Precision fractional divider design and implementation. In the FPGA development board fractional divider, input and output signals N_in [15: 0], D_in [15: 0], N_in [15: 0] less than D_in, ie the dividend is less than the divisor, quotient output Q_out [15: 0] in Q [15] necessarily 0, Q [14: 0] for the business of the fractional part. Input and calculation results display by VGA.)

本程序用以驱动安捷伦频谱仪和脉冲信号发生器，以产生格雷码波形。(It is aim to driver the PSG and ESA to generate Golay.)

DE2-115开发板LED显示测试源码，对fpga开发者提供参考(DE2-115 development board LED display test source, provide a reference for fpga developer)

用于FPGA的huffman算法的HDL编码，包括VHDL及Verilog代码。可用于JPEG及MPEG压缩算法。(The huffman algorithm for FPGA HDL coding, including VHDL and Verilog code. Can be used in JPEG and MPEG compression algorithms.)

实现DE2_115开发板上配套的500万像素cmos摄像头捕捉到的画面显示在VGA上(DE2_115 development board supporting 5,000,000 pixels cmos camera to capture the screen display in VGA)