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在传统的模拟影音设备中,传输视音频信号的接口一向比较单一,视频接口的主要有复合视频(Video)、S视频(S-Video)和色差视频(Component)方式,图像和声音分开传输,音频接口分别有传输模拟音频的接口和传输 PCM、Dolby 和 dts等数字流音频的接口。近年来数字影音发展迅猛,接口格式也不断推陈出新,例如与PC通用的USB、IEEE1394(i-Link)和DVI规格等,但是面对越来越高质素的数字视音频规格,例如 HDCD和 DVD-Audio,原有的数字接口难以很好地胜任。 1999年正式推出的DVI数字视频接口是近几年传输无压缩高清晰实时数码图像的新宠,目前已经成为 PDP等离子显示器、LCD液晶显示器和 DLP及 LCD单枪投影机的标准视频接口,同时也被广泛应用到电脑显卡上。光从技术规格来看,DVI支持的图像分辨率达1600×1200@85Hz 的UXGA和2048×1536@75Hz 的 OXGA,可以实现 720p、1080i和 1080p的 HDTV 图像实时传输,完全可以满足目前数字影音系统的需求。但从实际应用来看,DVI 有其先天的不足,一是接口体积规格过大,不适用于小型便携式影音设备;二是目前的DVI 规格分支过多,并非看见 DVI照接就行,光是搞错DVI-D 和DVI-I 就让用户头痛不已;三是DVI 不能传输音频信号,应用在影音系统中仍需另外的音频连线。
In traditional analog video and audio equipment, the interface for transmitting video and audio signals has always been relatively simple. The video interfaces mainly include composite video, S-Video and component video, and the video and audio are transmitted separately. The audio interface respectively has an interface for transmitting analog audio and an interface for transmitting digital audio streams such as PCM, Dolby and dts. In recent years, the rapid development of digital audio and video, interface formats are constantly evolving, such as common USB with the PC, IEEE1394 (i-Link) and DVI specifications, but more and more high-quality digital audio and video specifications, such as HDCD and DVD -Audio, the original digital interface is not well qualified. The DVI digital video interface, introduced in 1999, is the new favorite for transmitting uncompressed high-definition real-time digital images in recent years and has become the standard video interface for PDP plasma displays, LCD liquid crystal displays, and DLP and LCD single-shot projectors. Widely used in computer graphics. From a technical point of view, DVI supports image resolution 1600 × 1200 @ 85Hz UXGA and 2048 × 1536 @ 75Hz OXGA, 720p, 1080i and 1080p HDTV images can be real-time transmission, fully meet the current digital video system The demand. However, from the practical point of view, DVI has its inherent deficiencies, first, the interface size specification is too large, not suitable for small portable audio-visual equipment; second is the current DVI specifications branch too much, not see the DVI connection on the line, just engage Wrong DVI-D and DVI-I let the user endless headache; Third, DVI can not transmit audio signals, audio and video systems used in the application still need another audio connection.