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数字音频

数字音频计算机数据的存储是以0、1的形式存取的,那么数字音频就是首先将音频文件转化,接着再将这些电平信号转化成二进制数据保存,播放的时候就把这些数据转换为模拟的电平信号再送到喇叭播出,数字声音和一般磁带、广播、电视中的声音就存储播放方式而言有着本质区别。相比而言,它具有存储方便、存储成本低廉、存储和传输的过程中没有声音的失真、编辑和处理非常方便等特点。
  • 修数字板流程

    提供数字板维修流程的一些实际经验,希望对您有所帮助!

    标签: 数字板 流程

    上传时间: 2014-11-15

    上传用户:sssnaxie

  • 基于单片机AT89S52控制的数字频率计的设计

    提出一种基于单片机AT89S52控制的数字频率计的设计新方法。该方法将待测频率信号经过整形放大后输入单片机,然后由单片机控制内部计数器分别对待测信号和标准信号同时计数,再经运算处理得到测量结果,可自动量程转换,并由1602ALED显示器实时显示。该设计与传统测频系统相比,具有体积小、成本低、低功耗、精度高等优点,适用于各种测量电路。

    标签: 89S S52 AT 89

    上传时间: 2013-10-22

    上传用户:erkuizhang

  • 基于MSP430F1611单片机的音频信号分析仪设计

      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.

    标签: F1611 1611 430F MSP

    上传时间: 2013-12-11

    上传用户:jasonheung

  • 基于PIC16C71的数字水温配制阀的设计

      设计了一种基于PIC16C71单片机的数字水温配制阀。该配制阀采用NTC热敏电阻作温度传感器,与固定电阻组成简单分压电路作为水温测量电路,利用PIC16C71单片机内置的8位A/D转换器把热敏电阻上的模拟电压转换为数字量,PIC16C71单片机控制直流电机驱动混水阀调节冷热水的混合比例实现水温调节。给出了控制电路图,对水温测量电路的参数选择和测温精度作了详细讨论。实验和分析表明,选用阻值较大的NTC热敏电阻和分压电阻可较好地解决热敏电阻因功耗较大造成的热击穿问题。   Abstract:   A digital valve for controlling water temperature based on PIC16C71 was presented in this paper.A bleeder circuit which consisted of a NTC thermistor as temperature sensor and a fixed resistance was designed as water temperature measuring circuit.The analog voltage on the thermistor was converted into digital signal by a 8-bit A/D converter embedded in PIC16C71. Based on the digital signal, the MCU PIC16C71 drived the valve by a DC motor to adjust the water temperature through adjusting the proportion of hot water and cold water.The circuit diagram of controller was given,the principle,the component parameters and the accuracy of measuring temperatures were also dissertated in detail. It was found by experiment and analysis that thermal breakdown of thermistor caused by high power could be solved by selecting thermistor and fixed resistance with high impedance value.

    标签: PIC 16C C71 16

    上传时间: 2013-11-08

    上传用户:Yue Zhong

  • DK4.1P-多功能数字卡拉OK处理器

    LAXDK4.1P是多功能数字处理器,所有功能都通过双DSP处理实现。独立处理芯片实现全功能的参量均衡,精确分频,输出限幅。内置一个DSP效果器,包含两个独立的可编程引擎,分别处理回声、混响效果,实现无穷的效果组合。并且提供精确快速的反馈抑制功能。3路线路输入、背景音乐(BGM)功能,并带有同步视频切换。音乐通道配置7段全参量均衡适应千变万化的应用环境。话筒通道7段全参量均衡,配合优质话放电路带来清晰干净的演唱效果。超低音分频实现斜率、滤波器、上下限频点的全部可调,并配置3段参量均衡使调试更得心应手。独立中置输出通道,输出话筒直达声,并配置3段参量均衡大大提升演唱人声的表现能力。

    标签: 4.1 DK 多功能 卡拉OK处理器

    上传时间: 2013-10-26

    上传用户:herog3

  • 基于MC9S12HZ256的总线式汽车数字仪表设计

    首先研究CAN总线和SAE J1939协议,提出一种基于MC9S12HZ256微控制器的总线式汽车数字仪表解决方案。详细介绍SAE J1939协议的报文帧格式及应用层协议中发动机相关参数的定义,以及步进电机及其驱动和车速信号的处理方法。该数字仪表系统硬件平台由微处理器和信号采集和信息处理及显示等模块组成。软件设计部分编程实现了对CAN总线和各传感器数据的读取、处理。该系统能够实时反映车辆工况。 Abstract:  In this paper,CAN bus and SAE J1939protocol are researched,and a vehicle digital instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver,the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital instrument is composed by MCU,signal acquisition mod-ule,and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming,and vehicle condition can be reflected in real-time.

    标签: 256 MC9 S12 MC

    上传时间: 2013-10-20

    上传用户:huannan88

  • iis总线:基于IIS总线的嵌入式音频系统设计

    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  

    标签: iis IIS 总线 嵌入式

    上传时间: 2013-10-13

    上传用户:Aeray

  • 智能数字交流毫伏表的设计与实现AD637

    摘要:本文介绍了一种基于单片机和测量电压真有效值方案设计的智能数字交流毫伏表。它能精确测量任意波形的低频模拟周期信号并同时显示其有效值和分贝值。具有智能量程转换功能。 关键词:单片机  数字毫伏表  真有效值  智能量程转换

    标签: 637 AD 智能数字 交流

    上传时间: 2013-11-09

    上传用户:gaoqinwu

  • 基于8051F330的音频信号发生器的设计

     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.

    标签: 8051F330 音频信号 发生器

    上传时间: 2014-12-27

    上传用户:黄华强

  • 基于单片机与ADS1121的示波器数字多用表实现

    以FPGA为数字逻辑平台,借助继电器矩阵和多路模拟开关,以ADS1211为核心,在单片机控制下,联合实现手持式虚拟/智能存储示波表中数字多用表功能,实验表明该设计是行之有效的。文中介绍了数字多用表的系统结构,重点讨论了其测量电路和智能控制方案。   Abstract:  The digital multimeter in virtual/intellect digital-oscillorgaph was fulfilled, which was controlled by singlechip computer by relay matrix and analogue switches,in which FPGA was used for digital logical plot-form, ADS1211 for kernel chip, the experiment showed the design was feasible, the system struction was present-ed in the paper, measure circuit and intellect control plan of digital multimeter were mainly given.

    标签: 1121 ADS 单片机 示波器

    上传时间: 2013-11-02

    上传用户:瓦力瓦力hong