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Considered Class B digital video channel is a kind of channel with gamut conversion, compression codec and other procedures, the conventional component video test signals are "illegal" and "invalid" when going through the Class B channel. In order to solve this problem, this paper studied the design principles applied to the component video test signals used for Class B digital video channels, and three kinds of standard definition test signals and one kind of high definition test signal used for the Class B digital video channel are designed with the parameters of the GY/T 243-2010 "Standard-definition digital video TV channel technical requirements and methods of measurement", and these signals are implemented based on the Tektronix TG8000 multiformat test signal generator with XML language. Finally, a set of measurement experiments are performed with the test signals implemented in this paper.

This paper proposes a method for controlling video images in performance using video signals in the audio domain. It also describes a demonstration performance system using this representation method. This system consists of hardware for converting the component video signal to audio and software for easy control of image to produce the pitch(frequency), intensity(amplitude), rhythm and timbre(wave shape). Also included is data for verification of effectiveness of the proposed system and method of performance operation using a questionnaire survey of subject experiment, and demonstration of audio-visual performance in a public hall. This proposed representation method was created as a new unique relationship between video and audio signals, and also shows a new aspect of computer as a musical instrument.

An experimental digital VCR (DVCR hereinafter) was developed. The DVCR has two new technologies for reduction of tape consumption. One is a bit rate reduction technology of a component video signal down to around 25 Mbps and the other is a high density recording technology. The bit rate reduction technology is based on an 8/spl times/8/2/spl times/4/spl times/8 two dimensional DCT (Discrete Cosine Transform) and a VLC (Variable Length Coding) that completes over 5 macro blocks. Editing, trick plays and invisible error concealments also have been realized by this bit rate reduction while keeping the playback picture quality very high. The high density recording technology is based on ME tape and an ATF (Automatic Track Finding) system. A track pitch of 10 /spl mu/m and a bit length on tape of 0.25 /spl mu/m have been realized. The possibility of a higher linear recording density has been confirmed through theoretical analysis, simulations and experiments. >

An experimental digital VCR system for home use is described. A high-quality moving picture is obtained by a newly developed bit rate reduction technology, which is based on subband and three-dimensional DCT (discrete cosine transform) coding. A high-density magnetic recording method which adopts a 12-to-15 modulation scheme and superimposed error correction coding enable sufficient recording time with a small cassette. Component video signals with a ration of 4:2:2 were compressed to about the ratio of 1/7, keeping a high quality, using the subband and 3-D-DCT coding method. >

This paper describes the realization of a video encoder/decoder chip set for the consumer use digital video cassette recorder (VCR). The two chips with a 5 Mb external DRAM either encode the CCIR601 digital component video signal into the standard-definition digital VCR (DV) format or decode the DV format signal into a component video signal. The compression rate of the intraframe compression is about 1/6. The total power dissipation of the two LSI's is 142 mW at 2 V internal supply voltage, which is more than one order of magnitude smaller than the recently reported MPIEG2 (MP@ML) encoder systems. Low power was achieved primarily due to the compression scheme which is optimized for large-scale integration (LSI) implementation. The 0.5-/spl mu/m 2-V CMOS standard cell library was also effective in reducing the power consumption. Each chip, fabricated in two-layer metal 0.5-/spl mu/m CMOS technology, contains about 500 k transistors on 71 mm/sup 2/ and 79 mm/sup 2/ die, respectively.

The Disney Channel has been playing to air from video servers since November I, 1996. Twenty-four hours a day, seven days a week, all programming and promotional materials play to air from a pair of redundant video servers under the control of an automation system. Living with video servers is becoming a reality for all broadcasters. Whether servers are used facility-wise or only in isolated areas, broadcast engineers must understand how to use them effectively and be aware of their particular failure modes. Experience with computer operating systems and modern computer networking techniques is not only helpful, it is essential. The Disney/ABC Cable Group's Network Operation Center (NOC) in Burbank, CA., was built in the summer of 1996. The NOC went into operation in November 1996, with the origination of the Disney Channel from a new all-digital facility with ITU-R 601 digital component video and four channels of AES/EBU digital audio. Many rules have changed in moving from the analog VTR world to the digital server world. Simultaneous introduction of a digital facility, automated network playback system, and video servers taught the Disney engineering staff many lessons. In this paper, we intend to relate our experiences to help others plan and understand the coming change to server-based facilities.