SCAN VELOCITY MODULATION is a good thing?

[Leonard Caillouet]

"Steve(JazzHunter)" <jazzhunterNotHere@internet.com> wrote in message
news:0bs100tmiocibpsthn37dub0t2l8vu5mo6@4ax.com...

Let's set the playing field. The source is good, the connection to
the monitor is appropriate, and the monitor has flat response, thus
the monitor is showing what's on the source. Any sort of sharpening
or edging is to either cover a signal loss or to make the picture
appear sharper to the viewer. MAYBE a slight bit of coring can
compensate for scanning spot size, but that's only for very high
quality purposes. That's my generalization.

All my viewing is done on a Barco 21" or a Wega 32". No VM, the
response is measured as flat to the cathode, (Or matrix, there's
usually a test point) and a Leitch test generator is used for
calibration. Sources are Laser, DVD, Betacam, or DVcam. It's
remarkable how similar the picture is on the two completely and
dramatically different sets. The Wega is good enough for final edit
playback, though the geometry on these Sony sets suck. <g

I don't think we disagree very much here, especially the VM and geometry in
the WEGA. Granted, I'd rather avoid as much processing as possible, too. I
simply feel like the assumption that any VM is bad is unfounded. VM has
been used to describe a number of different methods for enhancing the end
result. Some have been switchable, some not. Most have more abhorrent
artifacts than good results. Some actually work pretty well in the context
of how consumers use the sets, with the kinds of signals that consumers use.

I deal with consumers every day who have to make choices like whether to buy
a Sony with switchable VM or a Mitsubishi that (at the consumer level) is
not switchable. The Mitsubishi still looks better on almost any source from
crappy VHS to HD, VM or not. When they read about how bad VM is without
understanding the context, it can be confusing and lead to lousy choices.

The "grade logic" in my Honda automatic transmission is annoying on certain
slopes. That doesn't mean it is a bad choice or that everyone should buy
manual transmissions...context and application matter.

Leonard Caillouet

 

[Steve(JazzHunter)]

On Sun, 11 Jan 2004 02:29:50 -0500, "Leonard Caillouet"
<lcailloNOSPAM@devoynet.com> wrote:

"Steve(JazzHunter)" <jazzhunterNotHere@internet.com> wrote in message
news:0bs100tmiocibpsthn37dub0t2l8vu5mo6@4ax.com...

Let's set the playing field. The source is good, the connection to
the monitor is appropriate, and the monitor has flat response, thus
the monitor is showing what's on the source. Any sort of sharpening
or edging is to either cover a signal loss or to make the picture
appear sharper to the viewer. MAYBE a slight bit of coring can
compensate for scanning spot size, but that's only for very high
quality purposes. That's my generalization.

All my viewing is done on a Barco 21" or a Wega 32". No VM, the
response is measured as flat to the cathode, (Or matrix, there's
usually a test point) and a Leitch test generator is used for
calibration. Sources are Laser, DVD, Betacam, or DVcam. It's
remarkable how similar the picture is on the two completely and
dramatically different sets. The Wega is good enough for final edit
playback, though the geometry on these Sony sets suck. <g

I don't think we disagree very much here, especially the VM and geometry in
the WEGA. Granted, I'd rather avoid as much processing as possible, too. I
simply feel like the assumption that any VM is bad is unfounded. VM has
been used to describe a number of different methods for enhancing the end
result. Some have been switchable, some not. Most have more abhorrent
artifacts than good results. Some actually work pretty well in the context
of how consumers use the sets, with the kinds of signals that consumers use.

I deal with consumers every day who have to make choices like whether to buy
a Sony with switchable VM or a Mitsubishi that (at the consumer level) is
not switchable. The Mitsubishi still looks better on almost any source from
crappy VHS to HD, VM or not. When they read about how bad VM is without
understanding the context, it can be confusing and lead to lousy choices.

The "grade logic" in my Honda automatic transmission is annoying on certain
slopes. That doesn't mean it is a bad choice or that everyone should buy
manual transmissions...context and application matter.

Hehe, the automatic transmission in my Honda Civic is a bit flaky
also. I'll slow to turn a corner, it downshifts, I speed up, it
upshifts, then I put down the accelerator a bit more and it double
downshifts and takes off like a rabbit Ithe mammalian kind.)

I have anElectrohome monitor, an industrial unit, .. lovely set but it
has horrible VM and I can't find the service information to find out
how to disable it. I disconnected a wire actually labelled "VM" on
the board, and no change. It still has less intrusive VM than that of
the Sony..

. Steve .

Leonard Caillouet

 

[ajb]

On Thu, 8 Jan 2004 12:16:16 -0500, John Massachusetts Pigye
<jesusjmppers@netzero.net> wrote:

I was at the local electronics store looking at the new televisions. I talked to the salesman and asked him about Scan Velocity Modulation and he
said that there's nothing wrong with it and he told me that If I tried to disable it I would void my warranty and
might even my homeowner's insurance (he must have been being naive).

I told him that ppl on USENET say that it's a bad thing and should be disabled. He told me that SVM is fine and that people on the internet have no lives and just spend all th eir time thinking up things to cry about.

Should I listen to this crackheads advice?

As an interesting note, producing a picture on a cathode ray tube by
scan velocity modulation was tried in the very earliest days of
experimental television. No very adequate means of beam current
modulation to vary the brightness of the 'picture' were available, so
the picture was formed solely by varying the scan velocity by the
image information, with fixed beam current. The faster the spot moved,
the dimmer the trace appeared...

It was _not_ a success, but I did once manage to achieve some sort of
picture by this method...

--
ajb

The older I get, the better I was.