Can a Logic Analyzer be used for video capturing

[[email protected]]

Ive been looking at a couple of usb logic analyzers, but it occured to
me, is it feasible to also use it as a slow video capture?

How can I determine if its fast/deep enough to capture a full frame of
digital data going out to a dac for rs-170? Is there a formula?


USBEESX: 8 Channel, Signal Generation Capability, i2c/spi monitor, 24
Msps$295: http://www.usbee.com/comp.html
LogicPort: 34 Channel, No Signal Generation Capability, $380:
http://www.pctestinstruments.com/

Ben

 

[Robert Baer]

Ive been looking at a couple of usb logic analyzers, but it occured to
me, is it feasible to also use it as a slow video capture?

How can I determine if its fast/deep enough to capture a full frame of
digital data going out to a dac for rs-170? Is there a formula?


USBEESX: 8 Channel, Signal Generation Capability, i2c/spi monitor, 24
Msps$295: http://www.usbee.com/comp.html
LogicPort: 34 Channel, No Signal Generation Capability, $380:
http://www.pctestinstruments.com/

Ben

The function of a logic analyzer is totally different and "alien" to
video capture, that it begs the question as to what you know about
electronic equipment (at minimum).

 

[Nico Coesel]

The function of a logic analyzer is totally different and "alien" to
video capture, that it begs the question as to what you know about
electronic equipment (at minimum).

A logic analyzer is perfectly suitable for reading an ADC output. If
the LA allows to save the captured data (and even better, control
triggering), you can use it to capture anything digital. I've used a
Tektronix DAS9200 to capture data from an ADC while being controlled
by a VB application.

 

[mike]

Ive been looking at a couple of usb logic analyzers, but it occured to
me, is it feasible to also use it as a slow video capture?

Of course it can store the output of an A/D converter. Emphasis on the
slow. If you put an A/D in front of a logic analyzer, you get a DSO.

How can I determine if its fast/deep enough to capture a full frame of
digital data going out to a dac for rs-170? Is there a formula?

Length of time you want to capture / sampling rate = memory depth

So, the answer to your question is yes, but doing anything useful is
unlikely.
mike

USBEESX: 8 Channel, Signal Generation Capability, i2c/spi monitor, 24
Msps$295: http://www.usbee.com/comp.html
LogicPort: 34 Channel, No Signal Generation Capability, $380:
http://www.pctestinstruments.com/

Ben

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[Bob]

The function of a logic analyzer is totally different and "alien" to
video capture, that it begs the question as to what you know about
electronic equipment (at minimum).

I think, rather, it raises the question whether or not you know what "begs
the question" really means.

Bob

 

[Rich Grise]

I think, rather, it raises the question whether or not you know what "begs
the question" really means.

That's running rampant these days. I can't think of a single time in the
last five or ten years that I've heard _anyone_ use that expression
properly - they _all_ use that same wrong meaning.

They should at least say, "begs _for_ the question."

Ah, well, as The Good Doctor said, "Against stuipdity, the gods themselves
contend in vain."

Thanks,
Rich

 

[Nial Stewart]

They should at least say, "begs _for_ the question."

A bit like when Americans (mostly) say "write me", then they
mean "write to me".

How was the 'to' dropped?

Nial.

 

[xray]

A bit like when Americans (mostly) say "write me", then they
mean "write to me".

How was the 'to' dropped?

It's easy do.

How about the expression "ring me" or "ring me up"? Does that bother you
too? If you can ring me then I don't see why I can't write you.

As long as we are asking pointless questions, what's up with Worcester?
Was it a case of an odd spelling choice at the beginning, or did
pronunciation evolve over time?

 

[Jim Thompson]

A bit like when Americans (mostly) say "write me", then they
mean "write to me".

How was the 'to' dropped?

Nial.

It's there. We 'mer'cans have just learned to mumble like Brits ;-)

...Jim Thompson

 

[John Woodgate]

I read in sci.electronics.design that xray <[email protected]>

As long as we are asking pointless questions, what's up with Worcester?
Was it a case of an odd spelling choice at the beginning, or did
pronunciation evolve over time?

The latter. The 'cester' part is from Latin 'castra' - a (military) camp
or the later Romano-British and then Saxon 'ceaster' - a fortified
settlement.

I couldn't find the original British (Celtic) or Roman name of the place
with Google, but it's probably there somewhere. It wasn't a very
important Roman camp.

Many of these irregular geographical pronunciations date from the 12th
and 13th centuries, when English was under very strong Norman French
influence. But some are actually survivals of earlier place names.

 

[Paul Burke]

John Woodgate wrote:

I couldn't find the original British (Celtic) or Roman name of the place
with Google, but it's probably there somewhere. It wasn't a very
important Roman camp.

Hwicwara-ceaster- the 'chester' of 'Hwic wara'- the people of the Saxon
tribe Hwicce. Reduced in pronunciation to Hwic- waracester, then the
prefix dropped. This tribe's territory extended over much of central
England, and left many other names, notably the rather lovely and
mysterious Wychwood. The name Hwicca could be actually Brythonic rather
than Saxon, meaning 'forest people'.

Many of these irregular geographical pronunciations date from the 12th
and 13th centuries, when English was under very strong Norman French
influence. But some are actually survivals of earlier place names.

One of the best was Shropshire, which the Normans minced to Salop, being
unable to negociate the consonant cluster. When the European
parliamentary constituencies were created, the one covering the area was
named Salop, which caused much mirth among their French speaking
colleagues ('salope' is 'bitch').

Paul Burke

 

[John Woodgate]

John Woodgate wrote:



Hwicwara-ceaster- the 'chester' of 'Hwic wara'- the people of the Saxon
tribe Hwicce. Reduced in pronunciation to Hwic- waracester, then the
prefix dropped. This tribe's territory extended over much of central
England, and left many other names, notably the rather lovely and
mysterious Wychwood. The name Hwicca could be actually Brythonic rather
than Saxon, meaning 'forest people'.
Hwicced!

One of the best was Shropshire, which the Normans minced to Salop, being
unable to negociate the consonant cluster. When the European
parliamentary constituencies were created, the one covering the area was
named Salop, which caused much mirth among their French speaking
colleagues ('salope' is 'bitch').

In the sense of 'shrew' or 'termagant', rather than 'dog ma'?

 

[Rich The Newsgropup Wacko]

In the sense of 'shrew' or 'termagant', rather than 'dog ma'?

My dogma got run over by my karma.

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