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Browse Prior Art Database

Video Mixer

IP.com Disclosure Number: IPCOM000079050D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Capozzi, RV: AUTHOR

Abstract

This mixer permits the presentation of both computer and camera generated video on a standard television tube.

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Video Mixer

This mixer permits the presentation of both computer and camera generated video on a standard television tube.

The computer 10 initiates a numeric display by addressing an address in memory 12 storing the desired data to be displayed. This generated video on a standard television tube.

The computer 10 initiates a numeric display by addressing an address in memory 12 storing the desired data to be displayed. This data is then read out into an assembler 14 which, in turn, uses the data to address a read-only store
16. The function of the read-only store 16 is to take the data stored in memory 12 and present it in raster form. To this end, the data bits read out of the memory are used to address the read-only store 16 along with bits 18, which indicate which of the lines 20 and the two interlaced fields 22 of the television picture 24 the data is presented on. The rastered data is then passed to the output register 26 for the read-only store 16 and from there into a shifter register 28, which reads the data into a mixer 30 one bit at a time.

The mixer 30 can then select the computer generated data and data obtained from video cameras.32 and 34, on the basis of signals 36 and 38 it receives from the computer. The blanking and cync pulse for the cameras 32 and 34 are generated by drivers 40 and 42, so that the camera and computer generated data is compatible.

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