Digital video recorder

Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium

Reexamination Certificate

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Details

C386S349000, C386S349000, C386S349000, C386S349000, C386S349000

Reexamination Certificate

active

07747143

ABSTRACT:
A unique high performance digital video recorder having a number of novel features. The recorder's electronics are all on a unitary printed circuit board. The recorder also requires at least one hard disk drive and audio and video input analog signals (from a source such as video camera or broadcast media) as well as a suitable monitor for receiving output audio and video analog signals. A external time code generator (i.e., VITC digital clock) is also required for synchronization. Also required are various manual control devices (i.e., panel controls) for mode selection. The electronics of the preferred embodiment comprise A-to-D and D-to-A converters, a hard disk interface, a JPEG compression encoder/decoder, a multi-port DRAM and DMA subsystem, a microprocessor with RS-232 and RS-422 access ports, various working memory devices and bus interfaces and a 16-bit stereo digital audio subsystem. Novel features of the preferred embodiment include use of an index table for disk addresses of recorded frames, a multi-port memory controller in the form of a field programmable gate array (FPGA), loop recording using dual channels, and dynamic JPEG compression compensation.

REFERENCES:
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patent: 6377745 (2002-04-01), Akiba et al.
patent: 6934464 (2005-08-01), Ayaki et al.
patent: 2002/0163963 (2002-11-01), Moote et al.
patent: 2004/0039867 (2004-02-01), Apfeldorfer et al.
patent: 2005/0031319 (2005-02-01), Fujita et al.
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