浅析数字录像机的发展动态及应用

通过数字录像机的发展状况,压缩技术及在非线性编辑中硬盘录像机的使用,分析了数字录像机的性能、原理。     

数字录像机的发展与设备选型

本回顾了数字录像机的发展历史，对各种数字录像机的主要性能特点以及各种记录格式的优缺点作了分析论述，并提出了数字录像机选型考虑的主要因素。     

DVCRPO数字录像机的维护保养与故障处理

目前各电视台大量采用数字录像机,数字录像机已成为电视台的主流机型,相较于模拟机型,数字设备记录的音质、图像效果优越,但价格较昂贵.目前市场上数字设备主要集中在两大公司,其生产的数字录像机格式不同,各电视台也多为两种不同格式的数字录像机共存,下面介绍松下DVCRPO数字录像机在使用中应如何维护保养.     

DVCPRO数字录像机的使用与维护

唐山电视台使用松下公司生产的DVCPRO数字录像机,主要设备是AJ-D640、AJ-D755、AJ-D930、AJ-D955等,在使用中经常遇到各种故障,其产生原因是多方面的,下面介绍这种数字录像机的基本性能和常见故障及维护经验。1 DVCPRO数字录像机的特点及性能1.1视频压缩方式DVCPRO采用DV压缩方     

最小型的数字分量录像机——DVCPRO

本文介绍了日本松下公司新近推出的最小型的数字分量录像机——DUCPRO的先进性能,以及各种不同的型号。     

数字录像机格式的选择

文章综述了目前数字录像机市场 4大主流产品的性能、特点 ,并对这几种产品详细分析和比较 ,对广大用户选型购买数字录像机有一定指导意义。     

DVCPRO格式数字录像机的常见故障排除与日常维护

本文阐述了DVCPRO数字录像机的基本性能，结合实践对DVCPRO数字录像机常见故障的解泱方法及日常维护的一些经验进行了总结。     

DVCPRO数字录像机的常见故障排除及其使用与维护

随着数字化的发展与普及,DVCPRO数字录像机以其低廉的价格和良好的兼容性与开放性,广泛应用于电视台的节目制作及播出中。本文首先阐述了DVCPRO数字录像机的基本性能,而后结合实践对DVCPRO数字录像机常见故障的解决方法及日常维护的一些经验体会进行了分析探讨。     

数字录像机的维护保养

在经过几年的数字化改造之后,目前在各电视台和电视机构中,数字录像机已经大量取代模拟录像机而成为主流机型。数字Betacam、Betacam SX、D-9等格式录像机都得到广泛使用,特别显DV系列录像机(包括DVCAM和DVCPRO、DVCPRO50录像机),更以其优质的性能、出色的画质、灵活的适用性、小     

数字Betacam录像机的维护心得

数字Betacam录像机作为标清领域图像质量最好的录像机,被广泛运用在一些大型电视台,担负着录制高质量电视节目的任务。数字Betacam录像机的优异性能得益于Sony公司在开发录像机上多年积累的经验,不仅体现在优秀的图像质量、可靠的机械结构上,而且在维护上也大量采用了数字技术,使之明显超越了上代模拟Betacam的技     

Achievements in rotary head magnetic recording

The principal achievements since 1980 in rotary head recording on magnetic tape are outlined. These developments are related to fundamental improvements in recording media, heads, the design of tape transports, and signal processing. The D-1 and D-2 video tape recorders (VTRs), the Hi-Band 8-mm video cassette recorder (VCR), and the rotary digital audio tape (R-DAT) recorders are discussed. The future of rotary head recorders for consumer digital VCRs, professional high-definition TV (HDTV) VTRs, and consumer HDTV VCRs is assessed     

Analog Data Recording with a Video Cassette Recorder

A multichannel, analog data storage system is presented which utilizes a compact video cassette recorder. Typical video cassette recorders operate at 3?ips and consequently allow up to one hour of continuous recording. The rotary two-head, helical-scan system employed yields a relative head-to-tape speed of 404.3 ips and a bandwidth of 3 to 4 MHz. The analog recording system described herein consists of an encoder which multiplexes and digitizes eight analog signals, a video recorder for storage of the digital data, and a decoder which demultiplexes and recovers the analog information. One unique feature of this system is that digital words which are generated consist of the channel number as well as the analog information present on that channel at the time of sampling. All information is combined serially and recorded with each word uniquely separated by a special "sync pulse." Another system feature is the ability to individually select the data bandwidth of each analog channel from values between approximately 25 kHz to 3 Hz. Design, fabrication, and evaluation is given. Interfacing to computing systems and microprocessors is discussed. An eight channel system with eight bit data words is described yielding approximately one-half percent resolution. However, the system is readily expandable to any number of channels and up to 16 bit data words yielding more resolution or higher signal-to-noise ratio.     

Digital video recording

Through mutual technology transfer between consumer and professional video recorders, the last 20 years has witnessed a rapid evolution from analog to digital recording. Each new digital videotape recorder (VTR) uses different channel coding. This implies that improving the recording density involves the development of new channel-coding schemes together with evolutionary magnetic tapes and heads. As a result, professional digital VTR's offer the best features for video recording. This paper reviews state-of-the-art magnetic recording devices, signal processing techniques for digital recording. It also describes the specifications for home-use digital recorders for current television systems, and discusses disk recording technology in the future     

Technology '88: consumer electronics

Developments during 1987 are reviewed. A variety of products based on laser optical-disk technology have been offered to consumers. New formats for video cassette recorders and camcorders make possible home television pictures with quality comparable to that from laser videodisks. Proposals for high-definition and improved-definition television broadcast systems, now under evaluation, also promise better pictures in the home. An expert opinion is given by Almon H. Clegg, executive vice president and chief operating officer of Denon America Inc., who predicts that two developments-digital video interactive (DVI) and Super VHS (S-VHS)-are likely to affect the market most during 1988     

Copy protection for DVD video

The prospect of consumer digital versatile disk (DVD) recorders highlights the challenge of protecting copyrighted video content from piracy. We describe the copy-protection system currently under consideration for DVD. The copy-protection system broadly tries to prevent illicit copies from being made from either the analog or digital I/O channels of DVD recorders. An analog copy-protection system is utilized to protect the NTSC/PAL output channel by preventing copies to VHS. The digital transmission of content is protected by a robust encryption protocol between two communicating devices. Watermarking is used to encode copy-control information retrievable from both digital and analog signals. Hence, such embedded signals avoid the need for metadata to be carried in either the digital or analog domains. Finally, the copy-protection system provides the capability for one-generation copying. We discuss some proposed solutions and some of the implementation issues that are being addressed     

Signal processing for future home-use digital VTR's

The author considers, mainly from the viewpoint of signal processing technologies, the current efforts for future home-use digital videotape recorders (VTRs). Recording technologies for future home-use digital VTRs are reviewed with respect to both current TV and HDTV systems. High-density recording and bit rate reduction are the major technologies needed for digital video recording with small cassettes. Recent experiments show that the technical problems, except those of equipment size and cost, have almost been solved     

株洲台基于双链路架构的高清播出技术建设方案

随着广播电视技术与计算机网络技术的融合发展,录像机和节目制作的高清普及,数字化高清播出已经成为当今电视发展的新阶段。如何搭建一个安全、高效、管控性强的高清播出系统已经变得尤为重要。     

MAV-555A在数字电视转播车中的应用

主要介绍了MAV-555A硬盘录像机的特点及其在数字转播车中的多种应用。电视转播车通过使用MAV-555A硬盘录像机在拓展了电视转播车功能的同时,也大大提高了电视节目转播及录制等方面的安全性,使电视转播车更能适应现代电视节目制作的要求。     

A 10-bit 20-MHz two-step parallel A/D converter with internal S/H

A 10-bit 20-MHz A/D converter for high-quality video systems such as high-definition television, video tape recorders for business use, and digital video cameras is described. This LSI circuit uses a standard two-step parallel architecture, includes automatic gain adjustment and digital two-bit error correction, and has a sample-and-hold circuit on the chip. It is fabricated by a 4.5-GHz f_T. 3-μm-rule standard bipolar technology. Its die size is 25 mm² , and its power consumption is 900 mW, which is about half of the lowest values reported to date. The converter can digitize video signals of up to 8.5 MHz at a conversion frequency of 20 MHz. The error in differential gain is 0.5 percent, and the error in differential phase is 0.5°