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Author Topic: Trivia question - what does VHS stand for? Marc Hansen Film Handler Posts: 93 From: Seattle, WA, USA Registered: Dec 2000 posted 02-06-2005 11:26 AM                     The first JVC beat them by a couple of months but was 2 hours only and did not use off-azmith recording.  |  IP: Logged Bobby Henderson "Ask me about Trajan." Posts: 10973 From: Lawton, OK, USA Registered: Apr 2001 posted 02-06-2005 12:02 PM                     quote: Michael Schaffer Speaking of SDDS, I heard a few times that was originally supposed to mean "Sony Dolby Digital Sound", but Dolby decided to pursue their own project, so it became "Dynamic". But I don't know if that's true. I think that's one of those confusions that came about from all the alphabet-soup acronyms of theatrical sound formats. For instance, I had seen numerous ads in newspapers that assumed DTS stood for Dolby Theater Sound. Dolby's "AC-2" codec was already in use at the end of the 1980's for purposes like satellite audio transmission and tele-conferencing. Cinema Digital Sound's debut in 1990 made Dolby rush an early announcement for Dolby Digital early in 1991, well before its theatrical debut in summer of 1992. By then the Dolby codec had been improved to a new version, "AC-3". SDDS didn't have their first prototype players ready until 1993. It was late summer 1994 before actual SDDS units went on sale to exhibitors.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-06-2005 07:58 PM                     Bobby, Sony DOES license alot of the parts of their system from Dolby! No matter what name they came up with it still sucks...... also wasn't CDS compression free? Son did some of the first demos of SDDS from hard drive. One showest demo was done this way. Mark  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 02-06-2005 11:50 PM                        quote: Bobby Henderson For instance, I had seen numerous ads in newspapers that assumed DTS stood for Dolby Theater Sound. Yeah, but that's just plain stupid! I think I actually heard the SDDS-Dolby connection thing from some actual Sony or Dolby people. But - I can't seem to remember now who that was...  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 02-23-2005 05:15 AM                     quote: Marc Hansen The first JVC beat them by a couple of months but was 2 hours only and did not use off-azmith recording ...wasn't that the JVC HB-3300 "VidStar" machine - the one with the dual rotary tuning dials to the right of the cassette loading door - the picture below? Being a single speed (SP) unit, didn't the VidStar also have a larger "write" area on the tape being that the heads were larger in surface area, thus having more lines of resolution, or just more clarity than the later 2 and 3 speed units of all of the other manufacturers? I have a Magnavox(Panasonic) VR-8417 that I purchased back in 1984 - one of the first HiFi units to be released. Just a 4 head-2 video and 2 audio. Unit setup is included as an audio recorder along with video, with VU's, input slider adjustments, Dolby "B" encoding for the linear track, and of course dBx "sound exander" configuration for the HiFi FM recording. Only thing I had to replace is the mode switch, and that was about 7 yrs ago. Can't find these kind of recorders anymore. -thx Monte  |  IP: Logged Mitchell Dvoskin Phenomenal Film Handler Posts: 1869 From: West Milford, NJ, USA Registered: Jan 2001 posted 02-23-2005 08:00 AM                     VHS - Vertical Horizontal Suck VHS - Very Horrible System ßetamax Forever!  |  IP: Logged Marc Hansen Film Handler Posts: 93 From: Seattle, WA, USA Registered: Dec 2000 posted 02-23-2005 10:39 AM                     Monte, Couldn't quote the model number but the pic looks right. It did leave space between the tracks instead of laying them against each other and putting the two heads on the head drum at different azmiths to prevent them from reading info from the adjacent track. the resolution is about the same but the S/N was better. It used more tape of course so 2 hours only. I don't have one any more but I think I still have a clear plex display top for one. It was such new technology that the customers wanted to see how it worked.  |  IP: Logged Jeffry L. Johnson Jedi Master Film Handler Posts: 809 From: Cleveland, Ohio, USA Registered: Apr 2000 posted 02-23-2005 11:37 AM                        Yes, Cinema Digital Sound (CDS) used lossless compression.  |  IP: Logged Bobby Henderson "Ask me about Trajan." Posts: 10973 From: Lawton, OK, USA Registered: Apr 2001 posted 02-23-2005 12:25 PM                     A couple years ago someone posted some technical stuff about CDS in the forums. It could have been Steve Kraus. Anyway, CDS used Delta Modulation for lossless compression. Still, the print had over 6 million bits of data being processed per second. I'm sure a bunch of that had to be for error correction and data redundancy. It's nearly double the number of bits you would need for 5.1 channels of standard 16-bit 44.1kHz LPCM.  |  IP: Logged Evans A Criswell Phenomenal Film Handler Posts: 1579 From: Huntsville, AL, USA Registered: Mar 2000 posted 02-25-2005 01:17 PM                        Using a larger writing area on the tape (the full 58 micron apace between tracks) gives better signal-to-noise, but not resolution. The head-to-tape writing speed is actually slightly faster on EP than SP, although by a negligible amount. It's a shame that the VHS system was unable to record the composite video signal directly like quad and Type C machines. That cruddy color-under system that the U-Matic, Beta, VHS, and all the "super" versions used (increasing the luminance bandwidth but not the color) ruined them.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 02-26-2005 03:43 AM                     quote: Evans A Criswell It's a shame that the VHS system was unable to record the composite video signal directly like quad and Type C machines ..is that what's called "Base band" video? -thx Monte  |  IP: Logged Paul Mayer Oh get out of it Melvin, before it pulls you under! Posts: 3836 From: Albuquerque, NM Registered: Feb 2000 posted 02-26-2005 08:37 PM                        "Baseband" just means any signal that can modulate a carrier. In the case of video, baseband refers to the video signal prior to the input of an RF modulator or transmitter. Video tape recorders modulate an FM carrier with the baseband video signal. The FM RF signal is what is actually recorded onto the tape. On quad machines there were several sets of FM carrier frequencies used to represent the sync tips, blanking level, and peak whites of the video signal: Low-band mono: Sync tip 4.28 MHz, blanking 5 MHz, 100IRE 6.8 MHz. Low-band color: Sync tip 5.5 MHz, blanking 5.79 MHz, 100IRE 6.5 MHz. High-band: Sync tip 7.06 MHz, blanking 7.9 MHz, 100IRE 10 MHz. High-band performance was good enough that it was adopted as the modulation standard for Type C when it came along. Most quad machines were eventually upgraded to high-band capability. Due to their lower tape writing speeds, helical consumer and U-Matic machines don't have the frequency response needed to handle the high end of these carrier frequency sets (where the color information is)--that's why they adopted JVC's color-under modulation scheme.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 02-27-2005 03:03 AM                     quote: Paul Mayer color-under modulation scheme. What is this "color-undermodulation scheme"- more or less of a lesser frequency to be the FM carrier signal for the video signal, and is the the basic reason for any of the helical scan machine, reel or cassette, playback much lesser than the Quadraplex playbacks? Course, quads with their 14k/rpm plus spinning heads in air bearings and with the 2inch tape speed at 15ips really helps this quality stand out as well. I do thank you for clearing this up some and answering this small question that I had on this about video. Here's a pict of the AMPEX/NAGRA VPR-5 that uses the "C" format. I'm quite amateurish in this field and learning some. thx-Monte [ 02-27-2005, 04:22 AM: Message edited by: Monte L Fullmer ]  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 02-27-2005 09:59 AM                        Wow! What was the maximum running time on one of those reels? This looks to me like an attempt to produce a broadcast-standard portable VTR just before UMatic ushered in the age of ENG - late '60s, perhaps? The pic of the helicopter on the brochure makes clear what it was intended for, I guess.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 02-27-2005 04:12 PM                     The basic unit was set up for 20 minute reels; by rearranging the reel hub location the unit could pay 60 minute length....a mechanical work of art that tilted the scales with a 15 lb / 6.8 kg package.  |  IP: Logged

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