100W光盘用半导体激光器

日本松下电子产业公司开发出适于高速改写型CD—R驱动装置用的低耗电、高可靠性的半导体激光器。采用该激光器可提高光利用效率、利于光学系统简化,可实现100mW高输出,寿命超过1万小时。除CD—R外,还可作为CD—RW和MO等光盘     

MD系统问答

一、MD概况 1. MO预定何时上市销售? 预定92年下半年。 2. MD与CD有何不同? MD是可录可放家用新颖音频媒介,而CD是只能放不能录的应用于家用Hi—Fi系统的数字信号源。 3. MD的含义是什么? MD是“MINI DISC”的英文缩写,意即微型唱片。 4. MD究竟是什么系统? MD是小型家用可录可放光媒介音频系统。 5. MD能与其他音频设备配合使用吗? 能配合使用。 6.开发MD有何必要? 在小型录放音系统更新换代的过程中,用     

MD微型音响(一)-MD的种类和构造

1 MD的种类和它的概述 (1) 何谓MD MD是Mini Disc的略语.MD是可以与音乐用CD(Compactdisc)匹敌,能录/放数字音的更小型光盘.     

信息集锦

全球首台光盘录像机不久前在我国诞生。它不仅填补了没有“可录”影碟机的市场空白,同时为影碟机市场注入新的发展活力。简单地说,这种光盘录像机就是能“录像”的影碟机,其功能同传统磁带式VHS录像机基本相同,它使用CD—R盘片或CD—RW记录影音信息,同时具备超级VCD机的所有功能。可以播放SVCD、VCD、CD碟片,并有光盘体积小、保存寿命长、视频效果质量高等优点。     

可多次录制的光碟

飞利浦公司即将推出一种可多次录制的CD光碟机,但这种光碟机需使用一种称作CD—RW(可重写CD)的特制光碟。这种光碟不能在目前使用的普通光碟机上播放,造成这种不兼容的原因在于CD—RW系统采用了独特技术,可多次重写的CD—RW与一次写但不可擦除的CD—R(可录制CD)是不同的。CD—RW光碟采用了     

浅谈光盘刻录的原理及其在电台中的应用

１引言目前，在许多广播电台，储存资料一般都是用磁带和盘带，近几年来，MD和MO也逐渐被应用。但是磁带、盘带容量小、体积大，且容易变质，不宜长期存放；MD和MO虽然较理想，盘片价格较高，特别是专用的MD机和MO磁盘机就更加昂贵。随着计算机多媒体技术的日益成熟，电脑在广播电台中的应用越来越广泛，一种新兴的储存方式———光盘刻录也随之产生。光盘刻录的优势：（１）刻录光盘存放方便，抗光性好，理论上存放资料时间可达１００年；（２）刻录光盘容量大，有６５０～７３０MB（相当７４～８０min），与MD差不多，若所录文件为…     

实用化可录CD光盘研制成功

我国可录CD光盘开发研究又获重大突破。由中科院上海光机所和华东理工大学共同承担的上海市科技重大项目—“市机存储材料光盘研究’，经过科技人员两年多的艰苦攻关，终于研制成功了实用化可录CD—R光盘，经专家测试鉴定，该光盘性能已达到商品化标准，从而为我国光盘高科技产业的发展奠定了技术基础。CD一R光盘是gD年代初国际上新开发出的高技术产品，它可由用户自行将声音、文字、图像等信息录人光盘，并能在一般的CD－ROM驱动器上回放，使用方便，在文件、档案的永久存储上代替磁带而获得广泛应用，也在声祝、计算机游戏、信息存…     

光盘录像机小议

<正> 21世纪来临之时一种新型的录像设备出现在民用消费品市场上。厦新VCR2000型VCD光盘录像机在国内露面,差不多同时,国际上DVD光盘录像机也上市了。 光盘录像机是一种用CD-R/RW和DVD-R/RW碟片作为媒体来记录图像的录像机。用只录光盘(-R)作媒体就只能一次性录入,录出的片子就和现在的VCD和DVD一样,只能用于播放。若用可再写光盘(-RW)作媒体就能像磁带录像机那样反复擦录。但-RW盘片的价格要比-R盘片高许多,私人使用擦抹次数不多,似用-R更经济实惠。这两种盘片的物理格式和读写原理,可参见介绍可录光盘的专题文章。     

视听技术小辞典

CD索尼和飞利浦公司联手研制的一种数字音乐光盘,有12cm直径和8cm直径两种规格,以前者最为常见,它能提供74分钟的高质量音乐。CD—ROM用于存储电脑数据的只读型CD。VCD采用MPEG-1压缩编码技术的影音光盘,其图像清晰度和VHS录像带差不多。超级VCDVCD的改进产品,采用MPEG-2编码,图像清晰度得到了提高。DVD一种外型类似CD的新一代超大容量光盘,它将广泛应用于高质量的影音节目记录和用作电脑的海量存储设备。MD索尼公司研制的迷你可录音乐光盘,外型象电脑用3.5英寸软盘,但采用光学信号拾取系统,类似CD。MD使用高效的压缩技术来达到与CD相同的记录时间,音质则接近CD     

数字音乐系统的发展

最近,日本索尼公司开发出一种微型光盘系统——MINI DISK(简称MD)。这个系统将模拟盒式磁带录音机便携、抗震的特点与激光唱机(即CD唱机)的优良音质、快速检索和操作方便的优势融于一体,并具有录/放的功能。 MD系统使用64mm(2.5英寸)磁光盘。每张盘可记录74分钟的数字音频信号。盘片装在一个盘套里以防损伤。这种盘片可以利用现有的生产激光唱片的设备制造。     

DVD-Video: multimedia for the masses

DVD (digital video disc, or digital versatile disc) is the next generation of optical disc storage technology. It's essentially a bigger, faster compact disc (CD) that can hold video as well as audio and computer data. DVD aims to encompass home entertainment, computers and business information with a single digital format, eventually replacing audio CD, videotape, laser disc, CD-ROM, and perhaps even video game cartridges. DVD has widespread-and unprecedented-support from all major electronics companies, all major computer hardware companies and most major movie and music studios, which says much for its chances of success. DVD-ROM holds computer data read by a DVD-ROM drive hooked up to a computer. DVD-Video is an application built on top of DVD-ROM. DVD-Video holds video programs played in a DVD player hooked up to a TV. The difference between DVD-ROM and DVD-Video resembles that between CD-ROM and audio CDs, including the important point that DVD-Video discs can be played in computers     

数字音频产品音频特性的基本测量方法

介绍了激光唱机和数字功率放大器等数字音频产品的音频特性及其测量方法,并详细讨论了在测试过程中如何选取和设置带通滤波器、低通滤波器和fs/2带通滤波器。     

Comparisons of EVD and DVD

1Introduction Chinahasthelargestmarketofaudio visualequip mentintheworld,whichisrapidlydevelopedfrom VCD,SVCDtoDVD.Now,themarketofDVDisin creasedveryfast,especiallyintheinternationalmarket(increasingbyafactorof25%everyyear).Butitis limitlessforpeopletohan…     

The emergence of the compact disc [History of Communications]

This article describes how the compact disc digital audio system, also known as the CD system, was the result of the successful merger of two major existing technologies. They are first, optical readout of information stored on an optical disc of 11.5 cm diameter, and second, the digital coding/decoding and digital processing of audio signals. I will describe how a complete digital version of this new audio system gradually emerged, within Philips, during the period 1973-1979. Finally, this paper recounts the partnership and collaboration between Philips and Sony that resulted in a common CD standard in June 1980 which soon after became the world standard. More details on the history of the CD not discussed here can be found in a lively, and accurate, doctoral thesis (in German) by J. Lang [1] and in a recent book [2].     

Technology 1992-consumer electronics

Significant developments during 1991 are highlighted. Tests of proposed US HDTV transmission systems got underway. A trend toward TV cable systems with higher channel capacities is developing in the US. Digital compact cassette (DCC) and mini disc systems began competing with digital audio tape. Proposals for digital audio radio, which would use a data compression scheme similar to that in DCC and Mini Disc received greater attention     

An introduction to super audio CD and DVD-Audio

Highlights the latest developments in consumer audio and specifically in DVD-Audio and SACD. The DVD-Audio specification allows for up to 24-b PCM data and uses the Meridian lossless packing (MLP) algorithm to provide up to six channels of high-quality, multichannel audio at sampling rates of up to 96 kHz for six channels or 192 kHz for two channels. Super-audio CD (SACD), introduced in March 1999, integrates a variety of new technologies, such as the hybrid disc, direct stream digital (DSD), and direct stream transfer coding.     

基于AIC23语音接口及AGC方法的实现

针对语音接口常见的信号幅度动荡的问题,设计了基于语音编解码芯片AIC23和数字信号处理器TMS320VC5416的语音接口。研究了基于AIC23内部可变增益放大器的语音信号自动增益控制(AGC)方法,所设计的语音接口电路简单、音质清晰、音量稳定。     

Synthesis of synchronous communication hardware in a multiprocessor architecture

ESPA is a high level synthesis tool targeted at the design of synchronous communication hardware in a multiprocessor architecture. IO communication can also be handled. It makes use of a new memory based architectural model which allows ESPA to generate efficient solutions for audio, speech and telecom applications. This will be shown using a complex example taken from a compact disc application.     

Technology '89: consumer electronics

Significant developments in consumer electronics during 1988 are highlighted. They include: FCC (Federal Communications Commission) rulings on high-definition television; the availability of television receivers with improved definition; accelerated work on active-matrix displays; brighter light-emitting diodes; the unveiling of the EIA standard home electronic bus; and an erasable CD (compact disc) audio player for under $500     

AES 67 Livewire+：数字电视音频领域中网络传输技术发展新趋势

2013年9月,AES 67网络音频技术标准的诞生,使网络音频传输技术在行业内引起了相当地关注。本文旨在回顾数字电视音频系统历史进程,并结合数字电视音频领域面临的新问题、新挑战与“Audio over IP”技术优势做为落脚点进行分析,同时以“AES 67 Livewire+”为例,具体分析数字电视音频网络传输技术的设计理念与目的。