本大作业是基于sst89e52rd2单片机制作的wav音乐播放器。该播放器可以播放存在sd卡中的音乐,通过对sd卡的读取并将数字信号送入单片机中,借助8位DA转换器TLC5620 变成模拟信号,经过放大器TDA2822放大交给扬声器发出最初读取的音频信号,实现音乐播放的功能。
上传时间: 2013-12-18
上传用户:wmwai1314
基于MSP430的低频功率放大器设计
上传时间: 2013-10-09
上传用户:1234321@q
为了检测血压测量系统中的微弱信号,采用由分立元件构成仪表放大器作为压力传感器前置放大器。运用Multsim对仪表放大器进行设计仿真,并对硬件电路安装调试。当输入信号带宽控制在10 Hz~2 kHz内,调节电位器RP可以使仪表放大器的增益可达90 dB。测试表明仪表放大器指标符合血压测量系统要求。
上传时间: 2013-11-22
上传用户:zhyiroy
MC34018双音频电话芯片
上传时间: 2013-10-24
上传用户:weiwolkt
为了使音频信号分析仪小巧可靠,成本低廉,设计了以2片MSP430F1611单片机为核心的系统。该系统将音频信号送入八阶巴特沃兹低通滤波器,对信号进行限幅放大、衰减、电平位移、缓冲,并利用一单片机负责对前级处理后的模拟信号进行采样,将采集得到的音频信号进行4 096点基2的FFT计算,并对信号加窗函数提高分辨率,另一单片机负责对信号的分析及控制显示设备。此设计精确的测量了音频信号的功率谱、周期性、失真度指标,达到较高的频率分辨率,并能将测量结果通过红外遥控器显示在液晶屏上。 Abstract: o make the audio signal analyzer cheaper, smaller and more reliable, this system sends the audio signal to the eight-order butterworth filter, and then amplifies, attenuates, buffers it in a limiting range, transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFT calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum, periodicity, power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.
上传时间: 2013-12-11
上传用户:jasonheung
摘要:介绍了基于IIS总线嵌入式音频设备硬件体系结构及其Linux驱动设计在音频驱动设计综合使用了DMA、分段多缓存区和内存映射技术以提高系统性能满足音频实时性要求。 关键词:音频设备驱动 IIS总线 嵌入式Linux DMA 内存映射
上传时间: 2013-10-13
上传用户:Aeray
MMC/SD卡以其优越的性能,在单片机嵌入式设备中得到广泛应用。将MMC/SD卡作为外部掉电存储介质应用于音频信号发生器中,通过8051F330单片机上的SPI接口,实现单片机—MMC/SD卡的存储扩展,设计了此硬件平台上的MMC/SD卡的单片机驱动程序,并给出了相应的程序代码,满足音频信号发生器的大容量存储要求。 Abstract: MMC/SD card is more and more widely used in the single chip embedded devices for their excellent performances.This article introduces the application of MMC/SD card as the external power down storage medium in audio signal generator. The extension technology especially for storage of single chip-MMC/SD card via SPI interfaces in 8051F330 single chip, including designs single chip drive program of MMC/SD card based on hardware platform,and also gives the key coding of the program. The implementation of big capacity storage is meaningful in audio signal generator.
上传时间: 2014-12-27
上传用户:黄华强
为降低成本和解决现有膜片钳放大器系统中PC机的干扰问题,研究了一种基于单片机的膜片钳放大器小系统。该系统采用ADI公司生产的ADuC841作为控制核心,并且配置相应的液晶显示模块LCM3202401。模拟电路部分采用高输入阻抗的AD8627实现微电流信号的采集,并由后级电路进行信号的放大和电阻电容的补偿。它具有硬件电路简单、体积小、使用方便的特点。既可以单独作为小系统实现采集和显示,也可以通过红外方式和PC机进行通讯,在PC机上进行信号的处理。 Abstract: In order to reduce cost and resolve the interferential problem with PC in existing patch clamp amplifiers, a small patch clamp amplifier system design based on microcontroller is studied. It adopts a new high performance microconverter ADuC841 by the ADI as the control core in the system, configuring a liquid crystal module LCM3202401. In the analog circuit, AD8627 with high input impedance is used to detect the low current,signal magnification, as well as resistance and capacitance compensation are accomplished by subsequent circuits. It has the advantage of simple hardware circuit design, small volume and convenient operation. It can either be used as an independent system to measure and show signal detected or transmit to PC by infrared ray.
上传时间: 2013-11-06
上传用户:yy_cn
利用AT89C51型单片机定时和中断功能,配以LM386型音频功率放大器,构成了作息号音自动播放器,为学校和机关管理提供方便。 Abstract: Using timing and interrupt function of the AT89C51 single-chip microcomputer and the LM386 audio power amplifier.It is constituted the automatic bugle player.This player facilitates the institution and the school daily management.
上传时间: 2013-10-10
上传用户:wivai
本文介绍了ISM收发芯片ATR2406的功能和特性,重点描述了ATR2406的配置方法和选择开环闭环状态时的注意事项,并给出了在无线音频传输系统的一些应用实例。
上传时间: 2014-01-06
上传用户:ljd123456