Browse Prior Art Database

Full Asynchronous Frame Synthesizer

IP.com Disclosure Number: IPCOM000099584D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Aoki, Y: AUTHOR [+2]

Abstract

Disclosed is a system for a full asynchronous frame synthesize operation between a workstation screen and NTSC signal. It supports moving pictures of the NTSC.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 91% of the total text.

Full Asynchronous Frame Synthesizer

       Disclosed is a system for a full asynchronous frame
synthesize operation between a workstation screen and NTSC signal.
It supports moving pictures of the NTSC.

      Referring to the figure, BLOCK 1 and MONITOR are video portions
of a workstation. BLOCK 2 is a color plane expansion unit into which
the NTSC signal comes.  To perform monitor screen refresh operation,
the color plane data in BLOCK 1 and BLOCK 2 are read regularly. In
this operation, BLOCK 1 is a master and BLOCK 2 is a slave.  UNIT 1
reads the data on the color plane and passes it on to UNIT 2, which
serializes that data and sends it to the monitor.  UNIT 2 generates
the address of the color plane also.  The NTSC and workstation screen
data are dotted before the monitor, thus two screens of data are
composed.

      On the other hand, the NTSC motion picture is written onto the
color plane of BLOCK 2 sharing the color plane bus with the screen
refresh operation.  UNIT 4 is an interface between the NTSC signal
and UNIT 2.  It separates RGB signals from the NTSC composite signal
and digitizes them. It generates the address of the color plane, too.
 RGB signals go to UNIT 1, and the address goes to UNIT 2 through the
internal bus.  It also gives UNIT 1 data latch timings. There is no
scan converter because the horizontal and vertical sampling frequency
between the NTSC and workstation are different enough.

      As a result, a frame synthesize...