INTRODUCTION In the past, adding speech recording and playback capability to a product meant using a digital signal processor or a specialized audio chip. Now, using a simplified Adaptive Differential Pulse Code Modulation(ADPCM) algorithm, these audio capabilities can be added to any PICmicro device. This application note will cover the ADPCM compression and decompression algorithms, performance comparison of all PICmicro devices, and an application using a PIC16C72 micro-controller.DEFINITION OF TERMS step size -value of the step used for quantization of ana-log signals and inverse quantization of a number of steps.quantization -the digital form of an analog input signal is represented by a finite number of steps.adaptive quantization -the step size of a quantizer is dramatically changed with time in order to adapt to a changing input signal.inverse quantizer -a finite number of steps is converted into a digital representation of an analog signal.
上传时间： 2022-06-20
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這包 BSP 支持了NUC970 系列芯片. 新唐科技的 NUC970 系列芯片是以 ARM926EJS 為核心的系统级單芯片. 包含了 16kB I-Cache 以及 16kB D-Cache 以及MMU 記憶體管理模塊. 最高支援到 300MHz 的頻率, 並且提供了豐富的外設接口周邊. 有USB 快速Host/Device, SDHC, 支援TFT LCD介面, 網路接口 和I2S audio介面, 有11 組UART…等. 並可以由 NAND flash, SPI Flash 開機.
标签： NUC970
上传时间： 2022-06-23
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AP3852 是一款拥有 CPU 和 DSP 双核的智能音频/语音处理芯片。芯片内置有 32 位 CPU 和 32 位 DSP 以及 2M FLASH，配合丰富的外围控制接口，非常适合各 种智能音频/语音处理系统。 该芯片配合菁音科技各种专利音频处理算法，能处理从声音输入、噪声消除、 音频预补偿、音效处理到声音回放的一个完整的音频通路；仅需配备简单的外围 器件即可组成高品质的音频输入/回放系统。能极大的提升产品的性能。 芯片内置 32Bits CPU，拥有良好的开发环境；内置 32Bits 音效处理 DSP，支 持浮点数运算、支持 FFT，方便各种进行各种算法编写；此外，为增加运算能力， 芯片还内置有一块专用的 Hardware Engine 单元，特别适合高速 FIR/IIR 运算。 芯片内置24Bits的Audio Codec，具有较高的SNR、THD。内置112KBytesSRAM； 内置 32 位 OTP Key，支持用户程序加密。 具有丰富的外围接口，包括 Full Speed USB Device、10Bits SAR ADC、SPI、I2C、 I2S、UART、GPIO 等。
上传时间： 2022-07-07
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PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上传时间： 2022-07-08
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芯片cx21986 规格书，希望能有帮助
上传时间： 2022-07-17
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MT7688 family integrates a 1T1R 802.11n Wi-Fi radio,a 580MHz MIPS? 24KEcTM CPU,1-port fast Ethernet PHY, USB2.0 host, PCIe, SD-XC,I2S/PCM and multiple slow IOs. MT7688 provides two operation modes-IoT gateway mode and IoT device mode. In IoT gateway mode, the PCI Express interface can connect to 802.1lac chipset for 1lac dual-band concurrent gateway. The high performance USB2.0 allows MT7688 to add 3G/LTE modem support or add a H.264 ISP for wireless IP camera. For the IoT device mode, MT7688 supports eMC, SD-XC and USB 2.0. MT7688 can support the Wifi high quality audio via 192Kbps/24bits I2S interface and VolP application through PCM. In IoT device mode, it further supports PWM, SPI slave,3d UARI and more GPIOs. For IoT gateway, it canl connect to touch panel and BLE, Zigbee/Z-Wave and sub-1G RF for smart home control.
上传时间： 2022-07-24
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VIP专区-嵌入式/单片机编程源码精选合集系列（75）资源包含以下内容：1. PCI9820数据采集卡的安装程序－－可实现双缓存模式的。连续数据采集。.2. 此文件是一个源程序代码.3. 不错的入门例子.4. 3310 的好资料.5. lcd的资料.6. 大三时做的.7. m16 的adc.8. 51上做到tcpip.9. 另一个在mpc8272上产生usb sof帧的demo.10. PIC ICD2仿真器的原理图与PCB.11. SD卡和AIC23数字音频输出实验, FreeDev Audio Dsp Board采用了TI公司的TVL320AIC23 1、控制接口使用I2C.12. quartusII 中文使用手册.13. 用中断方式编写的刷瓶显示程序.14. LCD液晶显示模块驱动程序.15. 基于2410开发板的嵌入式测试程序.16. 51系列的最简但功能齐全之spi总线的使用.17. WIGGLER小板原理图和PCB图.18. 杭州立宇泰的JTAG原理图.19. 在三星44b0开发板下可调试.20. jpeg压缩、解压的C源代码.21. 键盘去抖动CPLD设计经过验证,可以直接用数码管显示,同时也希望大家给于新想法.22. 采用Cypress EZ-USB设计原理图.23. 基于VxWorks的PCI设备驱动程序开发.24. Vx Works操作系统下PCI总线驱动设计.25. niosii实例程序供初学者使用.26. niosii c程序 niosii c程序.27. niosii c程序 niosii c程序.28. niosii c程序 niosii c程序.29. niosii c程序 niosii c程序.30. protel99se核心板原理图及相应PCB库2410.31. 最先进的信号机程序,经过很多重要场合测试通过.32. 该系统加入了led屏的硬件控制器.33. 44B0启动原代码.34. 目录文件结构： 用于s3c44b0 lcd_test ├─ main.c C语言主源文件 ├─ bmp.c 光标图案源文件 ├─ bmp.h 光标图案头文件 ├─ lcd.c LC.35. 晶杂管倒通角的控制！希望能给大家提供帮助！.36. 128*64串行输入数据.37. 红外解码,并带1602显示！希望能给大家提供帮助！.38. da0832的用法,希望能给大家提供帮助！.39. 24c08的用法!希望能给大家提供帮助!.40. ds1302时钟芯片的用法,希望能给大家提供帮助!.
标签： 汽车设计
上传时间： 2013-07-11
上传用户：eeworm
VIP专区-嵌入式/单片机编程源码精选合集系列（135）资源包含以下内容：1. AT89C52红外接收c源码 已经过调试 下载即可使用.2. 步进电机驱动控制技术及其应用设计研究 一编论文.3. Nucleus PLUS source code anasisy. An open source OS which is widely used in embedded development dom.4. 数字系统CAD 开发平台实验部分共有6 个实验.5. 12位ads7816的两种读取方式：SPI方式和手动方式.6. 可用于嵌入式编程学习.7. ADE7755应用于单相CPU卡表的硬件设计原理图.8. 电能表的结构原理介绍和工作原理介绍.9. 这是一个关于C＋＋编程规范的资料.10. C／C++bianchengguifan.11. 赛车程序：先对赛道和赛车建立模型.12. This document teach how you interface the microcontroller to the devices using i2c , spi and serial.13. 我收集的一些I2C的技术文档和在linux环境的应用分析等.14. 模糊PID在电阻炉温度控制系统中的应用。提出了FUZZY-PID控制器.15. 在网站上找到的一个比较不错的字符叠加程序.16. 包的运用.17. 嵌入式高速数据采集器的研制.18. 嵌入式C_C++语言精华文章集锦.19. Visual C++网络通信协议分析与应用实现代码.20. 嵌入式C编程语言入门与深入.21. 周立功的PCI51XX CAN卡在VC6.0下的开发示例.22. 飞思卡尔S12系Serial_Peripheral_Interphase_(SPI)应用范例.23. 飞思卡尔S12系列Inter-IC_Bus__(IIC)应用范例.24. 开机时.25. 简单的程序.26. U2270B组成的读卡头原理图!典型应用电路.27. lpc214x的开发平台下载软件 使用lpc214x的开发.28. ZIGBEE1015无线传感器统会自动删除debug和release目录.29. Introduction: 1. Macro1: AddFailureModeCol is used to the test report generated from GNPO Rpt Tools.30. 适合用于嵌入式的zc301摄像头驱动。解压缩之后放在/driver/media/video/zc0301目录下.31. 开源嵌入式图形软件FLTK使用 视频教程.32. jz4740 nand boot source code. jz4740 nand 引导代码.33. 用C++写的一个模拟ATM自动取款机的程序.我这个程序不同于网上现有的那个不能记录用户填写信息的..34. 该电子日历可显示年、月、日、星期、时、分的时间信息。 整个系统采用AT89C52作为中央处理芯片.35. 让你了解AODV在OPNET下怎么运用.36. 基于GPS定位的嵌入式汽车监控器设计.37. 使用手册.38. Zigbee培训资料.39. EASYARM2210的原理图 设计ARM硬件的重要参考.40. 嵌入式平台的开发全过程 非常易懂 嵌?胧狡教ǖ目⑷?非常易懂.
标签： 夜视
上传时间： 2013-05-25
上传用户：eeworm
御水临风原创88讲PADS VX速成视频 PADS视频教程 Eda365视频 比思电子 KGS - 25 周年庆PADS 9.5 中文有声视频电子教程.rar xDX Designer教程-Netlist Flow-Flash_KGS.zip pads教程视频.rar PADS 视频教程.rar PADS Video.7z PADS 2005视频教程.zip
上传时间： 2013-08-04
上传用户：eeworm
Tango Video Calls这款软件比较有特色，他的功能类似于iPhone4的Facetime，而且完全免费，有必要推荐一下。他的主要功能有：1.实现在3G网络下的视频通话。2.实现与 iPhone 3Gs 视频通话（通过背面的摄像头来实现）3.实现和其他智能手机打视频电话（目前仅支持 Android 的手机 要有前置摄像头）。
上传时间： 2013-05-23
上传用户：eeworm
