tecnologia:TV-Digital x TV-Analogica
- From: "MBocciaMcArt" <MBocciaMcArt@xxxxxxxxx>
- Date: 5 May 2006 11:44:33 -0700
What are the technical differences between HDTV and standard TV?
Features such as the differences in signal, screen resolution, etc...
What are the technical differences between HDTV and standard TV?Date
Sun, 19 Mar 2006 19:10:55 GMT
Pictures add realism to the television experience and crisp digital
pictures are one of the biggest advantages of digital television.
Unlike analog TV, digital TV is free from snow, ghosts and
interference. What's more, with HDTV or high-definition television, the
highest form of digital television, you get 4 to 5 times more picture
information than conventional TV pictures. Combine that with the new
widescreen format, and you have the ultimate home theater viewing
experience. HDTV has all the benefits of EDTV, but goes far beyond it
in picture resolution and audio features. The HDTV specification
requires a minimum of 720 horizontal scanning lines, far higher than
EDTV and about five times the resolution as analog TV! It's a level of
detail that you've never seen before. Read all about HDTV in my links.
- the_cinema_lover
Mainly it is the raster size. HDTV has more raster lines than TV -
peter-kaiser@xxxxxxxxxx
hd=high def much better if you have a good tv use hdtv if avialble -
gbradyjr2004
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what's the difference btw a dv camcorder and a dvd camcorder, cos I
need to buy one but I am confused?Date Sun, 26 Feb 2006 19:23:23 GMT
Digital Formats Digital camcorders differ from analog camcorders in a
few very important ways. They record information digitally, as bytes,
which means the image can be reproduced without losing any image or
audio quality. Digital video can also be downloaded to a computer,
where you can edit it or post it on the Web. Another distinction is
that digital video has a much better resolution than analog video,
typically 500 lines. There are two consumer digital formats in
widespread use: * MiniDV: MiniDV camcorders record on compact
cassettes, which are fairly expensive and hold about 60 to 90 minutes
of footage. The video has an impressive 500 lines of resolution,
however, and can be easily transferred to a personal computer. DV
camcorders can be extremely lightweight and compact -- many are about
the size of a paperback novel. Another interesting feature is the
ability to capture still pictures, just as a digital camera does. Sony
has recently introduced MicroMV, a format that works the same basic way
as MiniDV but records on much smaller tapes. Digital8 camcorders
(produced by Sony exclusively) are very similar to regular DV
camcorders, but they use standard Hi-8mm tapes, which are less
expensive. These tapes hold up to 60 minutes of footage, which can be
copied without any loss in quality. Just as with DV camcorders, you can
connect Digital8 camcorders to your computer to download your movies
for editing or Internet use. Digital8 cameras are generally a bit
larger than DV camcorders -- about the size of standard 8mm models. DVD
camcorders are still relatively rare, as compared to MiniDV models, but
their numbers are growing steadily. Instead of recording magnetic
signals on tape, these camcorders burn video information directly onto
small discs. The main advantage of this format is that each recording
session is recorded as an individual track, just like the individual
song tracks on a CD. Instead of rewinding and fast-fowarding through
tape, you can jump immediately to each section of video. Other than
that, DVD camcorders are pretty close to MiniDV models in performance.
The picture is a little better on DVD models, however, and DVDs can
store more footage. Depending on the camcorder's settings, a disc can
hold 30 minutes to two hours of video. The newer DVD camcorders support
two DVD formats: DVD-R and DVD-RAM. Both are three-quarters the size of
DVD movie discs and are encased in plastic cartridges (at least while
in the camcorder). The advantage of DVD-R camcorder discs is that they
work in most set-top DVD players. The drawback is that you can only
record to each disc once, which means you need to buy new discs
regularly. You can record over DVD-RAM discs again and again, but you
can't play them in ordinary DVD players. Like MiniDV tapes, you have to
either use your camcorder as a player for your TV or copy your movie to
another format. Photo courtesy Sony The Sony Network Handycam IP
records onto both MicroMV and Memory Stick. * Memory card: There are
now some digital camcorders that record directly onto solid-state
memory cards, such as Flash memory cards, Memory Sticks and SD cards.
These days, you can get a digital camcorder for $600 and pick up some
tapes for under $10. Digital video editing programs simplify the
editing process to the point where you can master it in an afternoon.
Even low-end analog camcorders have so many helpful features that
anybody can get decent footage with a little practice, and you can
create quality movies with more in-depth studying. The technology that
was once the exclusive domain of television professionals is now
available as hobby equipment. Whether you simply want to record
birthday parties and recitals or you hope to produce ambitious video
projects, the newest camcorders certainly have a lot to offer. - ravi
--------------------------
What's a good digital video camera to buy and what do you look for in a
good video camera for picture quality?
I'm looking to buy a video camera for the family, but I also might want
to share movies I make on the internet. So, I'd like a decent quality
camera that can do semi-professional work. What's a good digital video
camera to buy and what do you look for in a good video camera for
picture quality?Date Wed, 01 Feb 2006 19:22:34 GMT
Three things you want to look for in a camcorder: Price, Quality, What
are you using it for. Price: Decide how much you can spend. Camcorders
range in price from $300 to over $5000. Once you decide how much your
willing to spend, you can decide on the next factor. Quality: Each
format (VHS, MiniDV, DVD) has its own level of "Video Quality." VHS is
refered to as analog video becuase there is no digital signal on the
tape. MiniDV and DVD are digital formats. Digital formats have one
drawback to video quality. They are compressed data streams. Simply, to
save space, the amount of information for each frame of video is
compressed. Depending on how much compression takes place, determains
how sharp the video will appear on your TV. DVD and Hard drive based
camcorders us an MPEG2 compression. MiniDV uses a different compression
ratio. The other factor in video qulity is the number of "chips" or
"CCDs" in the camera. Broadcast quality cameras use 3 CCDs, each CCD
for each color of light in a TV picture (Red, Green, Blue). This makes
the image more lifelike. What Its Use: Depending on what your using you
new camcorder for will greatly determain what camcorder you need. If
your looking for something to just point and shoot for family
vacations, a single CCD camcorder that records on Hard Drive, DVD or
MiniDVD would work fine. If you want to see what you've shot right
away, then choose a DVD-R based camcorder. When finished, you just put
your DVD in your player and watch. If you plan on editing on a
computer, MiniDV, DVD and Hard Drive camcorders are best. MiniDV has
the best video quality and takes up the most space on your hard drive,
but MPEG2 formats (HDD and DVD) take up less space and you really don't
see that much difference. I hope this helps you decide what you need.
There are a lot of cameras out there, so take your time and choose
wisely. I myself perfer Sony, Panisonic and Samsung. Cannon, Sony, JVC
and Panisonic are the most common brands used by TV stations and Video
Production houses. I've been in the Broadcast TV business for over 20
years and I had a tough time finding the right camcorder. Good Luck. -
hausofnaber
YOU WANT ONE THAT WILL GET THE JOB DONE. - jeremy33087
Your best bet is the new JVC hard drive models. They have really good
picture quality. Their small and easy to use. Their best feature is
they have a 20 and 30 GB hard drive so you don't have worry about tapes
or mini DV's or anything like that. They also have an SD slot so you
can expand the memory or transfer data easly. The days of CDs, DVDs,
and tapes are slowly fading away. - marz
----------------------------------
Can a home stereo system be connected to computer system? ie: speakers,
multidisc changer etc? I want to save space and need the multi disc
changer/reciever but also want speakers that will play thru computer
and stereo also tv
Best Answer:
You are definitely looking for an all purpose AV receiver. Presently I
am listening to my music on Windows Media Player 10 (which does sound
better than Winamp...face it guys and gals) on my computer that is
coaxially connected to a Harman/Kardon AVR-130. As I am sure many would
agree, unless you are doing professional recording, the Creative line
of soundcards are the best thing going. Believe it or not, I just
bought this soundcard--again--last year and it continues to do justice:
Creative SBLive 5.1. It's very inexpensive (check out www.nextag.com--I
haven't even looked recently but I am sure it won't be over twenty
bucks) and does the duty well with it's coaxial digital output. Ensure
that you have digital-output capabilities, that way you don't have to
worry much about the hardware's D/A conversion properties and you can
put it directly in the hands of the guys who specialize in this
stuff--the Audio Receiver's manufacturer. I'm not a big fan of the
normal Pioneer, Sony, Kenwood but they might suffice you if you don't
care about the difference between a dome tweeter and a horn tweeter. In
the end, all that you would need is the same mini-plug to rca cord that
you would use in an analog setup. Follow the directions in both manuals
for proper connection to your receiver and sound card... Enjoy! - Gen
With a few simple things. You'll need a hardware device compadible with
your computer system. I recommend a soundblaster soundcard. With 5.1
surround system abilities to better the quality and overall performance
of your home entertainment system. Please shop at your Local Walmart
for a soundcard with surround system abilities. After installing this
feature, you should be able to use the hardware provided with soundcard
to connect your two systems together. Using the output port and rca
cables. - Brian Matthews
I can connect my computer speaker output directly into my stereo
speaker input (from back of computer speakers out, to back of home
stereo speakers in). You can also go from home stereo speakers out, to
the back of computer speakers in. The problem is that the jacks on the
back of the computer are like the little headphone jacks, and the jacks
on the back of the stereo are similar to the jacks you use to go from
video games, VCR's, or DVD players to the back of your TV or stereo
system. You will have to go and buy a cable that will adapt from the
computer jacks to the stereo jacks. I just built my own cable from old
stuff I had laying around and it works great! I can play a CD in the
computer and then run it to the stereo which will amplify the signal
and be just like you were playing the CD from the stereo itself. NOTE:
On the back of the stereo, I plug the jacks into the AUX inputs and
then when I want to switch from the stereo to the computer, I just flip
the switch on the front of the stereo to AUX - spaminated1
Try an adaptor cable like this one.
http://www.walmart.com/catalog/product.do?product_id=3913841 Plug the
mini-jack (small end) into the speaker out port or headphone jack on
the computer. Plug the jacks on the other end of the cable into the
auxiliary (or AUX) input on your stereo or receiver. Set the stereo to
AUX by using the "Source" or "Input" button. That should do the trick.
- patriotsrright
----------------------------------
Please tell me the difference between a digital tv, analog tv and an hd
tv. percent clarity difference? It is cofusing while buying a tv. What
is the percentage differnce between them to account for the difference
in their price. It is more so between analog and digital TV. Please
respond. Thanks
Best Answer:
ALL HD TV is Digital, but not all Digital TV is HD. HDTV is a type of
Digital TV (DTV) service. HDTV provides high resolution programming in
a widescreen format. A current analog TV picture can provide resolution
of up to 480 horizontal lines. An HDTV picture can have up to 1080
lines, allowing for stunning picture detail. Widescreen format refers
to an image's aspect ratio, which is a comparison of screen width to
screen height. Analog television has an aspect ratio of 4 by 3, which
means the screen is 4 units wide by 3 units high. The aspect ratio of
HDTV is 16 by 9, the same as a movie theater screen. HDTV programs
include Dolby digital surround sound, similar to what is used in movie
theaters and on DVDs. DTV is a more flexible and efficient technology
than the current broadcast technology, which uses "analog." For
example, rather than being limited to providing one analog programming
channel, a broadcaster will be able to provide a super sharp "high
definition" (HDTV) program or multiple "standard definition" DTV
programs simultaneously. Providing several program streams on one
broadcast channel is called "multicasting." The number of programs a
station can send on one assigned digital channel depends on the level
of picture detail, also known as "resolution," desired in each
programming stream. DTV can provide interactive video and data services
that easily surpass those in "analog" technology. Standard
Definition TV (SDTV) - SDTV is the basic level of quality display and
resolution for both analog and digital. Transmission of SDTV may be in
either the traditional (4:3) or widescreen (16:9) format. Enhanced
Definition TV (EDTV) - EDTV is a step up from Analog Television. EDTV
comes in 480p widescreen (16:9) or traditional (4:3) format and
provides better picture quality than SDTV, but not as high as HDTV.
High Definition TV (HDTV) - HDTV in widescreen format (16:9) provides
the highest resolution and picture quality of all digital broadcast
formats. Combined with digitally enhanced sound technology, HDTV sets
new standards for sound and picture quality in television. (Note: HDTV
and digital TV are not the same thing -- HDTV is one format of digital
TV.) - Answerman
------------------------
Will a digital cable ready HDTV improve picture quality of plain basic
cable compared to my old analog TV? Local appliance dealer says I will
get some digital channels anyway and it will be better. Will digital
cable ready HDTV improve picture quality of plain basic cable?Date Fri,
30 Dec 2005 01:52:26 GMT
My experience is that an HDTV will expose all the defects of analog
cable. You will also see a difference with better DVD players (not
necessarily more expensive). If you switch to Satellite TV with a new
HDTV you will be amazed at the picture improvement - even standard
definition programming. - WebtvDan
Chances are that if your new TV is HDTV ready, it's a failrly recent
and technologically advanced piece of equipment. If this is the case,
many new TV's already have enhanced picture ability without the HDTV
converter attached. I experience this now with my Hitachi Ultravision
HDTV TV vs. my Sony WEGA, non-HDTV compliant. - DoctorGold
----------------------------------
differences between hdtv antennas and regular antennas?Date Mon, 12 Dec
2005 17:37:42 GMT
HDTV antennas only recieve ATSC (HDTV) signals while regular antennas
only receieve NTSC (Standard TV) sigals. HDTV signals are digital while
Standard TV signals are analog. - Mig
the materials they are made of and the signal in which they recieve -
Markj
-----------------------------------
Help. Explain what I should look for in a 40"+ flat panel TV. Where
should I buy?Date Mon, 28 Nov 2005 00:23:53 GMT
It all depends on what you're looking for it to do, and what you're
gonna be using it for. There are alot of formats out there. Tube, LCOS,
LCD, DLP, etc. Here's a little info on some of 'em. If you're talking
about 40" plus, you've effectively ruled out picture tube based
televisions, they don't get above about 36". Pros for those are
excellent contrast, excellent color, closest to lifelike picture
quality, and the best viewing angles. Cons are the size limit, they're
really heavy (bigger ones in excess of 200lbs), and they're really
deep. On the low end of things you have a standard CRT-based (cathode
ray tube) rear projection model. They're the cheapest of the big screen
bunch, and they offer very good color output, but also the worst for
viewing angle, contrast, and many times you're gonna get glare on the
screen. You also have to worry about poor light output, and burn in -
this happens when a static image (such as your health meter on a video
game, or a stock ticker on the bottom of the screen, for instance)
stays in one spot for an extended period of time and it permanently
burns it into your screen. You're essentially gonna get what you pay
for. Next, you get into the front projection world. While this format
is wrought with lots of things to concern yourself with, and is without
equal for the most difficult and elaborate set-up; it also offers the
closest to a theater-like experience one can get in-home - it also
offers the biggest screen, depending on the size of the screen you
purchase. There are a few different formats you can get for the
projector, that is you can buy LCD, DLP, etc - more on those formats to
come - differences between them are lessened in this format, the most
important things to look for are a high contrast ratio, giving you
better and more black levels, allowing more black levels, greys, etc)
and a high lumen output. (basically the light it's putting out)
Something to consider, you have to have a very dark room, just like a
theater, for this format to work for you. It's also very important you
don't skimp on the screen - this is just important as the projector you
choose. Don't forget, you're also gonna have to worry about buying a
mounting system for the projector..and typically the projector will not
have it's own tuner or speakers, so you're gonna basically have to have
a home theater system for sound. Sound like a lot of work and hassle?
You're right, it is. Now you have your flat-panel displays. First, LCD
(or Liquid Crystal Display) has been used for years and years in
computer monitors, they're great because they're often very thin, have
very good light output, they're reasonably light and easy to hang on
the wall, and don't use much power or product much heat. However if
you're looking to view HDTV (high definition) with it, (more on that
later) watch out, many times the best resolution you'll get out of
these TV's is EDTV - (extended definition) - which is not quite as
good. Also, keep in mind LCD has an issue with not being able to
display a true black, but instead displays a very dark grey. The other
flat panel is your Plasma TV. They're extremely nice, they produce a
more true black-color than the LCD, and have great viewing angles.
They're also pretty expensive, pretty deep, and heavier than LCD, thus
very tough to hang on the wall. These are also have a very high
potential for burn-in. There are newer televisions with protection
against this burn-in, features that move static images imperceptibly,
so little that the human eye can't detect it but enough that it will
prevent a burn in, however TV's with this feature are typically
prohibitively expensive. My personal favourite of the bunch are the
'microdisplay' rear projection models. These are great televisions.
They're much much thinner than the CRT projections TV's, much lighter,
smaller cabinets, great viewing angles, and after you've used them for
years, it's fairly simple to have the projection bulb replaced and the
TV will perform like new again. Again, here, there are a few
formats..you have LCD again, LCoS (a newer format, stands for 'liquid
crystal on silicon') which is supposed to offer a smaller pixel size on
the screen, and thus a more seamless, better picture quality -- and
finally you have my personal recommendation, the rear projection DLP
television. DLP stands for 'digital light processing', it's a format
brought into existance by Texas Instruments. It has better colors, and
better reproduction of black than LCD, and virtually no potential for
burn-in. The only disadantage is a 'rainbow effect' a small percentage
of viewers experience, a side effect of the way the color is produced
on the screen. The good news is that technology has moved away from the
rainbow effect, and it's much less of an issue with DLP now. The other
good news is that it's very, very inexpensive to pick one up if you
know what you're looking for. I was able to find a very, very nice 43"
DLP HDTV television on the internet yesterday for slightly over $1000
delivered. An awesome price. Now - there's SDTV (standard definition)
EDTV (extended definition) and HDTV (high definition) when you're
looking at what they can do. SDTV is basically what you're looking at
on television right now. It is output at 480i. This basically means 480
horizontal lines of resolution interlaced. Interlaced means the
horizontal lines in your picture refresh in an interlaced pattern, so
lines 1, 3, 5, 7, 9, etc..refresh, and then lines 2, 4, 6, 8, 10
refresh. TV right now, unless you have digital cable (and even some of
those channels aren't really digital yet) or a mini satellite dish, is
analog. But there's a move to digital on the way for everything..and
furthermore, everything is going to be moving to HDTV before too much
longer. Back to our story. If you have an extended definition TV it
will display an image at 480p which is 480 lines of horizontal
resolution in progressive scan. Progressive scan is great, it means
instead of the way interlaced scanning works, progressive refreshes the
horizontal lines of your picture in order, like 1, 2, 3, 4, 5 and this
will give you a much smoother, more stable, more accurate picture. And
then there's HDTV. You get your 720p, and your 1080i resolutions, and
for the really new, really fancy, really expensive TV's you get your
1080p resolution. This is a fantastic looking picture. Now we get into
the aspect ratio of the television picture. Most of the things you see
on broadcast TV except for things that are clearly displayed in
widescreen, certain movies, or things like ER or The Sopranos, are
displayed in 4:3 ratio, that is 4 is to horizontal as 3 is to vertical.
These screens are the ones that show the black bars on the top and
bottom of the screen when you play something in widescreen. The good
stuff is 16:9 ratio, that's right, 16 across, and 9 up and down. This
is the standard widescreen aspect ratio, if you have a 16:9 TV you
won't have to worry about those black letterboxes on the top and bottom
of your picture for widescreen, but if you're watching an old-school
show, or movie in 4:3 ratio you're gonna get the black bars on the
sides instead - luckily, most TV's like this will stretch it out to
16:9 for you. There we go..my best advice, get a rear projection DLP
with upconversion to 720p, (that's right, good HDTV's will upconvert
everything you send to it to the native resolution of the TV [native
resolution: the way the TV looks the best] it won't look as good as the
real resolution, but it will look pretty damn good) 3:2 pulldown,
(something that converts a movie back to the format it's supposed to be
in) and as many other fancy-sounding features as you can find for the
price. Samsung is really really good, Toshiba is pretty great as well.
Shop around a bit..best places to check: http://www.pricegrabber.com/
-also try- http://www.epinions.com/ - ERIQ
Eriq answered the question well for the technology coverage - if you
need help finding which product is best, check out Dontbuyjunk.com -
it's designed for that purpose. - AnswerMan
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