November 8-10, 1991 - Klofas.com

international CCITT H.261 digital
video standard (see Fig. 3). Codec
manufacturers are introducing
models of PC based codecs which
operate satisfactorily at 384 Kbps
and currently sell for less than
$10,000 (including the PC). These
prices are still well beyond the
Amateur market, but they are about
half whattheywere when this presentation
was made last year at the
1990 AMSAT-NA Space Symposium
in Texas. As all of you who
may have long ago purchased a
9600bps modem for nearly a grand
well know, that's not the end of the
story.
When the codec chip sets become
more available in 1992 they
are expected to initially sell for between
$1500 and $2500. This price
will fall as supplies become plentiful,
other manufacturers enter the
market, and the initial supplier has
recouped its research investment.
Digital video codecs which are PC
based are already on the market,
and video telephones will begin to
make an appearance on the consumer
scene in the not too distant
future. Further along, it is likely
that a codec-on-a-chip will be introduced
which will make PC based
systems and video telephones even
fI..E.MWI
RECQMMENDADCtlSUBJECT
SfATUS OF ccrrr VIOEO SfANDARDS JUNE 27.1991
H.221 FRAME STRUCTURE FOR A 64 TO 1920KBITIS CHANNEL AOOPTe) 12/90
IN AUDIOVISUAL TELESERVICES.
H.230
FFWwlE SVNCHROOOUS CON'TROlAND 1NOlCA'l'JOII 12/90
SIGNAlS FOR AUDiOViSUAL SERVICES
H.242 SYSTEM FOR ESTABUSHING COMMLlNICATlON BETWEEN ADClFI'ED 12/90
AUDIOVISUAL TERMINAlS USING DIGITAl.CIWIflELS UP
TO 2MBIT/S.
1-1.261
1-1.261
H.320
VlOEO COOEC FOR AUDIOVISUAL SERVICES AT Px64KBITS. ADClF'TED 12/90
STIll FRAME VIDEO GRAPHICS
NARROWBAND VISUAL TELEPHONE SYSTEMS AND
TERMINAL EQUIPMENT.
6192 •
12190
6.722 ADAPTIVE OIFFERENTIAL PULSE CODE MODULATION 1986
(AD?CM) AUDIO 48fS6/64KBIT/S.
6.711 PULSE CODE MODULATION (PCM) AuOIO 64KBITIS. 1984
AV.2S4 LOW BIT RATE AUDIO (16KBIT/S). IN 6/92'
DE\IEI.OPMENT
AV.231 MULTIPOINT CONTROL UNITS FOR AUDIOVISUAL SYSTEMS. IN 6/92'
OEVEI..DPMENT
AV.243 SYSTEM FOR ESTABUSHlNGCa.1M1.JNICA'l'JOIIBE1'WEEN IN 6/92'
THREE OR MOREAUOIOVISUAL TERMINALS USING DIGITAl. DEVELOPMENT
CHANNELS UPT02MBITIS.
AV.441
CAU-CONTROL PROCEDURES FOR REAl-TIME AUDIO. IN 6/92'
VISUAL CONFERENCE CALlS - PROCEDURES NOT DEIIEl0Pt.4ENT
REQUIRING SPECIAL NETWORK CAPABILmES.
AV.442 CAU-CONTROL PROCEDURES FOR REAl-T1t.4E AUDIO. IN 6/92'
VISUAL CONFERENCE CAIJ.S - PROCEDURES REQUIRING DEVE!..DPMOO
SPECIAL NETWORK CAPABIUTIES.
AV.233 PRNACY SYSTEM FOR NARROW BAND VIDEO SYSTEMS IN 6/92'
(ENCRYPTION)
DEVEL.OPMENT
AV.270
JPEG
USER DATA TRANSMISSION (MULTI-LAYER PROTOCOl) IN 6/92'
DE\IEJ.DPMENT
JOINT PHOTOGRAPHlC EXPERT GROUP, HIGH PENOING ?
RESOLUTION GRAPHlCS
NOTE:' THE FIJU. CCfTTSOOY MEETS EVeRY FOUR YEARS TO RECOMMEND ADOPTION OF STANDARDS
TO WE MEMBERSHIP. 'I1iE NEXT SCHEDULED CCITT MEETING IS 1992. RECOMMENDATIONS ADOPTED
IIYTHE COMMITTEE ARE SENT ON FOR MEMBER RATIFICATION. RECOMMENOATIONSOR PROPOSAlS
THAT ARE NOT READY FOR APPROVAl., CAN BE APPROVED BY ErTHER A SPECIAL P~DURE OR WHEN
THE FUU. ccm MEMBERSHIP CONVENES IN 199$.
more economical. Fig. 3
These factors, coupled with the new international standards developments relating to digital
video telecommunications, will quickly combine to drive prices rapidly downward. I expect that
by the time the Phase 3D Satellite is launched there will be available for about $500, a card which
can be inserted into an expansion port on your Pc. This card, coupled with perhaps a minor
modification to your satellite transceiver, will allow you to receive a full motion digital video
transmission from an Amateur satellite or terrestrial source. The output would be converted for
display on your computer monitor. By connecting a home video camera or other NTSC video
source such a VHS VCR, you could digitize the video and uplink it to the Phase 3D satellite for a
two-way motion and color ADV contact. With the current digital developments in commercially
manufactured Amateur Radio equipment, perhaps even the minor modification to your radio will
not be necessary.
COMPRESSED DIGITAL VIDEO OPENS A NEW WORLD FOR AMATEURS!
Amateur Digital Video (ADV) contacts will not only be possible via future OSCAR satellites, but
the terrestrial use of ADV instead of analog A TV would be much more spectrum efficient. This
4