Felston DD740 Digital Audio Delay: Fix Lip-Sync Error for Good!
We've worked out an
exclusive deal for our members to bring you this product at a price lower than anywhere else on the internet!
ORDER NOW »
When you watch TV or movies, do you ever notice
how picture and sound are sometimes OUT OF SYNC? The
presenter's lips don't move quite at the same time
as their voice? Irritating isn't it. This is known
as lip sync error.
Even if you haven't consciously noticed lip-sync
error (we avoid this impossibility by subconsciously
research at Stanford University
discovered it causes a negative impact on our
perception of the characters and story.
Lip sync error affects a huge number of displays,
including modern plasma TVs, LCD screens, DLP TVs
and digital projectors.
What causes lip sync error?
There are many causes but most boil down to the
video signal being delayed more than the audio
signal allowing speech to be heard 'before' the lip
movement that produced it is seen.
Digital image processing within broadcasts and
within modern displays delays video and allows audio
to arrive too soon.
Sound "before" the action that produces it can never
occur in nature and is therefore very disturbing
when the brain tries to process this conflicting and
impossible visual and aural information.
How do you fix lip sync error?
The only way to correct lip-sync error caused by
delayed video is to delay audio an equal amount.
Felston DD740 digital audio delay solves
lip-sync error by letting you add an audio delay to
compensate for all the cumulative video delays - no
matter what their cause - at the touch of a button
on its remote.
Unlike the audio delay feature found in most a/v
DD740 is designed for easy
"on-the-'fly" adjustment while viewing with no image
disturbance. This makes fine tuning for perfect
lip-sync practical as it changes between programs or
discs, and the DD740's 680ms delay corrects larger
lip-sync errors common in HDTV.
Questions? Email us at:
More Information »
JETI Specbos 1201/1211 Reference Spectroradiometers with ChromaPure
available at a special CurtPalme.com discounted price!
ORDER NOW »
Specbos 1201 and 1211 are the most affordable true reference color
analyzers available on the market today. Just mount either on a tripod, facing towards the source, connect to ChromaPure Pro and use as you
would any other color analyzer.
At some point many professionals conclude that their work requires a
reference colour analyzer. SMPTE has established standards for such a device. It
must measure color accurately to within ±0.002 xy at or above 10 cd/m2 and
luminance accurately to within ±0.5 cd/m2 for white field measurements. These
are very exacting specifications that no tristimulus colorimeter can achieve, at
least for chromaticity. For this level of accuracy you must have a 5nm
Unfortunately, such devices are not cheap. The Photo Research and Minolta
reference devices start at about $15,000 and go up to near $30,000. The
X-Rite EyeOne Pro is reasonably
affordable, but it is a 10nm device that cannot routinely achieve ±0.002 xy
accuracy. Furthermore, in addition to being expensive, true reference devices
also often suffer from practical limitations. They can be slow and have problems
with low-light readings.
Recently, a German company JETI Reference
Instruments has developed two true reference spectroradiometers, the
Specbos 1201 (also known in the U.S. as the
Orb Optronics SP100)
and the Specbos 1211, that solve most of these problems.
First, they are relatively affordable, that is at least what passes as
"affordable" in the context of reference devices. Second, both are reasonably
fast for higher luminance sources, and the 1211 is speedy even with low
luminance sources. They are also amazingly compact and portable and both include
a nifty laser spotter that allows for accurate aiming.
The only feature these incredible devices give up to the established Photo Research and Minolta
competitors is stand-alone operation. The Minolta and Photo Research
alternatives allow for aiming through optical sights and readouts on a small LCD
screen. They are fully functional devices without a PC. In contrast, the JETI
devices work only when attached to a PC via USB with custom software (such as
ChromaPure of course!). For display/home
theater calibration this is a non-issue as you'll be using calibration software
Both units share a similar design and software support. Both achieve
reference levels of accuracy. The differences? Well, the 1211 is larger than the
1201 and about 30% more expensive. But surely the most important difference is
low-light sensitivity. The 1211 is MUCH more sensitive than the 1201. At light
levels at or above 50 cd/m2 (14.6 fL) they perform similarly, but as you go
lower than this the 1201 begins to take noticeably longer and longer to return a
reading. At 4 cd/m2 (1.2 fL) the 1201 will take approximately a
minute-and-a-half to return a reading. By way of contrast, at this level of
stimulus, the 1211 chugs happily along returning a reading in about 5 seconds.
This has profound implications for day-to-day use when calibrating displays.
For this reason, the 1201 is best used for color management, when light levels
are generally high, or as a reference device employed to create an offset for a
field colorimeter, such as the
Chroma 5 or Hubble. The 1211, on the other hand,
can be used as a working or field color analyzer (one that is not solely only
used to create offsets to make other faster meters accurate). Its speed and low-light sensitivity
make it suitable for any calibration task—except perhaps reading black
level—where the light level is so low even the 1211 often cannot cope.
Fortunately, very low light levels can be accurately read with quite inexpensive
instruments, such as the
AEMC CA813 illuminance meter. The
Chroma 5 will read down to about 0.01
fL, and the Hubble will read down to
Confused about meters? See our
FAQ: Which meter
is right for me?
Questions? Email us at:
More Information »