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技术资料 基于单片机可语音控制和报时的数字时钟的设计
以STC89C516单片机为主机,STC11L08XE单片机为从机,在传统按键控制式数字时钟的基础上加入语音识别模块和语音合成模块,实现了可语音控制和语音报时的功能。该时钟除具有计时功能外,还具有整点报时、询问报时和闹钟功能;既可用按键控制,也可通过人机对话的形式语音控制。经测试,语音识别率可达75%。不仅适用于广场、车站、客 ...
文件格式 This project aim was to build wireless software modem for data communication between two computers
This project aim was to build wireless software modem for data communication
between two computers using an acoustic interface in the voice frequency range (20Hz–
20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz –
20,000Hz) and the receiving antenna is a microphone (fr ...
通讯编程文档 Abstract-The effect of the companding process on QAM signals has been under investigation for the p
Abstract-The effect of the companding process on QAM signals
has been under investigation for the past several years. The
compander, included in the PCM telephone network to improve
voice performance, has an unusual affect on digital QAM data
signals which are transmitted over the same channel. The ...
电子书籍 The i-mode service by NTT DoCoMo is a mobile phone service in Japan that provides its customers wit
The i-mode service by NTT DoCoMo is a mobile phone service in Japan that provides its
customers with both voice and comprehensive data services. With an i-mode phone, users can
exchange i-mode e-mail and obtain information from i-mode menu sites and i-mode compatible
Internet sites.
The i-mode phone ...
技术资料 基于SIP协议的语音网关开发设计
· 摘要：  对于市场定位在小用户,要求价格介于低端产品与中高端产品之间的网关产品设计,选择IP2022和DSP111作为网关的主控制器和语音的编解码处理器.IP2022是一款RISC的处理器,运算速度为120 MIPS;而Voice Pump的DSP产品在语音处理上得到了很广泛的应用,且价格低廉,满足现阶段对语音的需求.另外,这些器件具有强 ...
技术资料 非接触式IC卡射频识读器的设计与实现
针对接触式IC卡技术的接触问题以及有源工作,采取射频识别技术与IC卡技术相结合的方法,解决了IC卡技术接触性的问题,实现IC卡的非接触使用与无源工作的功能,并在此基础上附加语音播报功能。文章主要研究的带语音功能的识读器是以射频识别技术为基础,MIFARE卡作为识读器识别的对象、根据ISO14443A协议、采用非接触式IC卡常用的 ...
书籍 4G & Beyond Convergence of Networks
From the transition of analog to digital communication along with seamless mobility and
high computing power of small handheld devices, the wireless communications industry has
seen tremendous changes leading to the integration of several telecommunication networks,
devices and services over last 30 ...
书籍 Essentials+of+LTE+and+LTE-A
The next-generation wireless broadband technology is changing the way
we work, live, learn, and communicate through effective use of state-
of-the-art mobile broadband technology. The packet-data-based revolu-
tion started around 2000 with the introduction of 1x Evolved Data Only
(1xEV-DO) and 1x Ev ...
书籍 Time-Varying Channels
Wireless communications has become a field of enormous scientific and economic interest. Recent
success stories include 2G and 3G cellular voice and data services (e.g., GSM and UMTS), wireless
local area networks (WiFi/IEEE 802.11x), wireless broadband access (WiMAX/IEEE 802.16x), and
digital broad ...
技术资料 4G移动通信技术权威指南：LTE与LTE-Advanced.4G LTE.LTE
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 moreblu ...