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.
上傳時(shí)間： 2022-06-20
上傳用戶：
這包 BSP 支持了NUC970 系列芯片. 新唐科技的 NUC970 系列芯片是以 ARM926EJS 為核心的系統(tǒng)級(jí)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(shè)接口周邊. 有USB 快速Host/Device, SDHC, 支援TFT LCD介面, 網(wǎng)路接口 和I2S audio介面, 有11 組UART…等. 並可以由 NAND flash, SPI Flash 開(kāi)機(jī).
標(biāo)簽： NUC970
上傳時(shí)間： 2022-06-23
上傳用戶：slq1234567890
AP3852 是一款擁有 CPU 和 DSP 雙核的智能音頻/語(yǔ)音處理芯片。芯片內(nèi)置有 32 位 CPU 和 32 位 DSP 以及 2M FLASH，配合豐富的外圍控制接口，非常適合各 種智能音頻/語(yǔ)音處理系統(tǒng)。 該芯片配合菁音科技各種專利音頻處理算法，能處理從聲音輸入、噪聲消除、 音頻預(yù)補(bǔ)償、音效處理到聲音回放的一個(gè)完整的音頻通路；僅需配備簡(jiǎn)單的外圍 器件即可組成高品質(zhì)的音頻輸入/回放系統(tǒng)。能極大的提升產(chǎn)品的性能。 芯片內(nèi)置 32Bits CPU，擁有良好的開(kāi)發(fā)環(huán)境；內(nèi)置 32Bits 音效處理 DSP，支 持浮點(diǎn)數(shù)運(yùn)算、支持 FFT，方便各種進(jìn)行各種算法編寫；此外，為增加運(yùn)算能力， 芯片還內(nèi)置有一塊專用的 Hardware Engine 單元，特別適合高速 FIR/IIR 運(yùn)算。 芯片內(nèi)置24Bits的Audio Codec，具有較高的SNR、THD。內(nèi)置112KBytesSRAM； 內(nèi)置 32 位 OTP Key，支持用戶程序加密。 具有豐富的外圍接口，包括 Full Speed USB Device、10Bits SAR ADC、SPI、I2C、 I2S、UART、GPIO 等。
標(biāo)簽： usb192k 麥克風(fēng) 芯片 ap3852 規(guī)格
上傳時(shí)間： 2022-07-07
上傳用戶：
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
標(biāo)簽： 4g 移動(dòng)通信
上傳時(shí)間： 2022-07-08
上傳用戶：
芯片cx21986 規(guī)格書，希望能有幫助
上傳時(shí)間： 2022-07-17
上傳用戶：
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.
上傳時(shí)間： 2022-07-24
上傳用戶：
VIP專區(qū)-嵌入式/單片機(jī)編程源碼精選合集系列（75）資源包含以下內(nèi)容：1. PCI9820數(shù)據(jù)采集卡的安裝程序－－可實(shí)現(xiàn)雙緩存模式的。連續(xù)數(shù)據(jù)采集。.2. 此文件是一個(gè)源程序代碼.3. 不錯(cuò)的入門例子.4. 3310 的好資料.5. lcd的資料.6. 大三時(shí)做的.7. m16 的adc.8. 51上做到tcpip.9. 另一個(gè)在mpc8272上產(chǎn)生usb sof幀的demo.10. PIC ICD2仿真器的原理圖與PCB.11. SD卡和AIC23數(shù)字音頻輸出實(shí)驗(yàn), FreeDev Audio Dsp Board采用了TI公司的TVL320AIC23 1、控制接口使用I2C.12. quartusII 中文使用手冊(cè).13. 用中斷方式編寫的刷瓶顯示程序.14. LCD液晶顯示模塊驅(qū)動(dòng)程序.15. 基于2410開(kāi)發(fā)板的嵌入式測(cè)試程序.16. 51系列的最簡(jiǎn)但功能齊全之spi總線的使用.17. WIGGLER小板原理圖和PCB圖.18. 杭州立宇泰的JTAG原理圖.19. 在三星44b0開(kāi)發(fā)板下可調(diào)試.20. jpeg壓縮、解壓的C源代碼.21. 鍵盤去抖動(dòng)CPLD設(shè)計(jì)經(jīng)過(guò)驗(yàn)證,可以直接用數(shù)碼管顯示,同時(shí)也希望大家給于新想法.22. 采用Cypress EZ-USB設(shè)計(jì)原理圖.23. 基于VxWorks的PCI設(shè)備驅(qū)動(dòng)程序開(kāi)發(fā).24. Vx Works操作系統(tǒng)下PCI總線驅(qū)動(dòng)設(shè)計(jì).25. niosii實(shí)例程序供初學(xué)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核心板原理圖及相應(yīng)PCB庫(kù)2410.31. 最先進(jìn)的信號(hào)機(jī)程序,經(jīng)過(guò)很多重要場(chǎng)合測(cè)試通過(guò).32. 該系統(tǒng)加入了led屏的硬件控制器.33. 44B0啟動(dòng)原代碼.34. 目錄文件結(jié)構(gòu)： 用于s3c44b0 lcd_test ├─ main.c C語(yǔ)言主源文件 ├─ bmp.c 光標(biāo)圖案源文件 ├─ bmp.h 光標(biāo)圖案頭文件 ├─ lcd.c LC.35. 晶雜管倒通角的控制！希望能給大家提供幫助！.36. 128*64串行輸入數(shù)據(jù).37. 紅外解碼,并帶1602顯示！希望能給大家提供幫助！.38. da0832的用法,希望能給大家提供幫助！.39. 24c08的用法!希望能給大家提供幫助!.40. ds1302時(shí)鐘芯片的用法,希望能給大家提供幫助!.
標(biāo)簽： 汽車設(shè)計(jì)
上傳時(shí)間： 2013-07-11
上傳用戶：eeworm
VIP專區(qū)-嵌入式/單片機(jī)編程源碼精選合集系列（135）資源包含以下內(nèi)容：1. AT89C52紅外接收c源碼 已經(jīng)過(guò)調(diào)試 下載即可使用.2. 步進(jìn)電機(jī)驅(qū)動(dòng)控制技術(shù)及其應(yīng)用設(shè)計(jì)研究 一編論文.3. Nucleus PLUS source code anasisy. An open source OS which is widely used in embedded development dom.4. 數(shù)字系統(tǒng)CAD 開(kāi)發(fā)平臺(tái)實(shí)驗(yàn)部分共有6 個(gè)實(shí)驗(yàn).5. 12位ads7816的兩種讀取方式：SPI方式和手動(dòng)方式.6. 可用于嵌入式編程學(xué)習(xí).7. ADE7755應(yīng)用于單相CPU卡表的硬件設(shè)計(jì)原理圖.8. 電能表的結(jié)構(gòu)原理介紹和工作原理介紹.9. 這是一個(gè)關(guān)于C＋＋編程規(guī)范的資料.10. C／C++bianchengguifan.11. 賽車程序：先對(duì)賽道和賽車建立模型.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的技術(shù)文檔和在linux環(huán)境的應(yīng)用分析等.14. 模糊PID在電阻爐溫度控制系統(tǒng)中的應(yīng)用。提出了FUZZY-PID控制器.15. 在網(wǎng)站上找到的一個(gè)比較不錯(cuò)的字符疊加程序.16. 包的運(yùn)用.17. 嵌入式高速數(shù)據(jù)采集器的研制.18. 嵌入式C_C++語(yǔ)言精華文章集錦.19. Visual C++網(wǎng)絡(luò)通信協(xié)議分析與應(yīng)用實(shí)現(xiàn)代碼.20. 嵌入式C編程語(yǔ)言入門與深入.21. 周立功的PCI51XX CAN卡在VC6.0下的開(kāi)發(fā)示例.22. 飛思卡爾S12系Serial_Peripheral_Interphase_(SPI)應(yīng)用范例.23. 飛思卡爾S12系列Inter-IC_Bus__(IIC)應(yīng)用范例.24. 開(kāi)機(jī)時(shí).25. 簡(jiǎn)單的程序.26. U2270B組成的讀卡頭原理圖!典型應(yīng)用電路.27. lpc214x的開(kāi)發(fā)平臺(tái)下載軟件 使用lpc214x的開(kāi)發(fā).28. ZIGBEE1015無(wú)線傳感器統(tǒng)會(huì)自動(dòng)刪除debug和release目錄.29. Introduction: 1. Macro1: AddFailureModeCol is used to the test report generated from GNPO Rpt Tools.30. 適合用于嵌入式的zc301攝像頭驅(qū)動(dòng)。解壓縮之后放在/driver/media/video/zc0301目錄下.31. 開(kāi)源嵌入式圖形軟件FLTK使用 視頻教程.32. jz4740 nand boot source code. jz4740 nand 引導(dǎo)代碼.33. 用C++寫的一個(gè)模擬ATM自動(dòng)取款機(jī)的程序.我這個(gè)程序不同于網(wǎng)上現(xiàn)有的那個(gè)不能記錄用戶填寫信息的..34. 該電子日歷可顯示年、月、日、星期、時(shí)、分的時(shí)間信息。 整個(gè)系統(tǒng)采用AT89C52作為中央處理芯片.35. 讓你了解AODV在OPNET下怎么運(yùn)用.36. 基于GPS定位的嵌入式汽車監(jiān)控器設(shè)計(jì).37. 使用手冊(cè).38. Zigbee培訓(xùn)資料.39. EASYARM2210的原理圖 設(shè)計(jì)ARM硬件的重要參考.40. 嵌入式平臺(tái)的開(kāi)發(fā)全過(guò)程 非常易懂 嵌?朧狡教ǖ目⑷?非常易懂.
標(biāo)簽： 夜視
上傳時(shí)間： 2013-05-25
上傳用戶：eeworm
御水臨風(fēng)原創(chuàng)88講PADS VX速成視頻 PADS視頻教程 Eda365視頻 比思電子 KGS - 25 周年慶PADS 9.5 中文有聲視頻電子教程.rar xDX Designer教程-Netlist Flow-Flash_KGS.zip pads教程視頻.rar PADS 視頻教程.rar PADS Video.7z PADS 2005視頻教程.zip
標(biāo)簽： 模 并行 系統(tǒng)研究
上傳時(shí)間： 2013-08-04
上傳用戶：eeworm
Tango Video Calls這款軟件比較有特色，他的功能類似于iPhone4的Facetime，而且完全免費(fèi)，有必要推薦一下。他的主要功能有：1.實(shí)現(xiàn)在3G網(wǎng)絡(luò)下的視頻通話。2.實(shí)現(xiàn)與 iPhone 3Gs 視頻通話（通過(guò)背面的攝像頭來(lái)實(shí)現(xiàn)）3.實(shí)現(xiàn)和其他智能手機(jī)打視頻電話（目前僅支持 Android 的手機(jī) 要有前置攝像頭）。
上傳時(shí)間： 2013-05-23
上傳用戶：eeworm
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