Prevention down-carrying technology of files of video-audio frequencies is a colligation management system of prevention down-carrying technology of files of video-audio frequencies running under the circumstance of Windows and based on campus network.

In this paper, the principle of LPC technique and the audio file especially the WAVE file are introduced The LPC application in audio file is also discussed Meanwhile we give the flow chart of the LPC technique dealing with the WAVE file and the WAVE file regained flow char

Discusses the ways to create audio database by Delphi,and realizes the play of audio file in broadcast station.

This article is based on the video file metadata object for the study, the video file through property research, video files for network storage and retrieval features, the application of Dublin Core metadata set, the video meta-data definition and description of collection and the video file metadata management system for a summary of the design.

This paper introduces the formats, contents and characteristics of video files on the Internet, expounds some methods for searching the video files through the approaches such as search engine, P2P software, ftp server, web page search, video database, etc.