MC34018双音频电话芯片
上传时间: 2013-10-24
上传用户:weiwolkt
数码管八段编码
上传时间: 2013-11-21
上传用户:qw12
在理论分析循环码编码和译码基本原理的基础上,提出了基于单片机系统的(24,16)循环码软件实现编码、译码的方案。仿真结果表明(24,16)循环码能有效地克服来自通讯信道的干扰,保证数据通信的可靠及系统的稳定,使误码率大幅度降低。本论文对(24,16)循环码的研究结果表明,可以有效地降低错误概率和提高系统的吞吐量,实现纠错仅需要在接收端增加有限的存储空间和计算复杂度,具有一定的实用价值。 Abstract: Based on analyzing the theory of encoding and decoding of cyclic code, this paper showed the schemes of encoding and decoding of(24,16)cyclic code by the software and based on microcontroller. Simulation results show that using (24,16) cyclic codes can effectively overcome the interference from communication channel, ensure the reliability and stability of data communication systems, and reduce the bit error rate greatly. The results of this paper show that by using the (24,16) cyclic code, the error rate can be reduced and the system throughput can be improved. Meanwhile, the system only needs to enlarge limited storage space and computation the complexity at the receiving end to realize error correction. Thus the (24,16) cyclic code has a practical value.
上传时间: 2013-11-09
上传用户:gaoliangncepu
摘要! 就如何使用单片机对旋转增量编码器鉴相进行了研究! 给出了常用的鉴相算法以及识 别"毛刺#的方法!并通过在!AVR单片机上编程验证了所给出的鉴相方法$ 更多编码器知识请访问http://www.elecfans.com/zhuanti/20111111242149.html
上传时间: 2013-11-16
上传用户:wojiaohs
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
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
单片机与PC机通信中的纠错编码
上传时间: 2013-11-04
上传用户:四只眼
摘要:采用C51单片机作为三值光计算机编码器的控制核心,实现了可以长时间稳定工作的三值光计算机编码器模型。C5l单片机主要完成了与上位机通信和控制液晶单元工作的功能。文中从硬件和软件两个方面对使用的单片机系统进行了详细讨论,着重介绍了单片机系统中硬件的设计、实现方法和软件流程及核心程序段。实验结果表明该系统性能稳定可靠,目前已在360位的三值逻辑光学处理器模拟机中使用。关键词:嵌入式系统;单片机控制系统;三值光计算机;编码器
上传时间: 2013-12-02
上传用户:lxm