When the
first television broadcasts hit the airwaves in the 1920’s, television shows
were transmitted using an analog signal. But in 1996, a new technology
was invented that would change the way TV signals were transmitted through the
air, with a digital signal. Today, the FCC requires all TVs to contain a
digital tuner and for most TV stations to broadcast their channels in digital
format.
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The big
difference between Analog and Digital is how the signal is transmitted from the
source to the TV in your home. Analog TV’s transmit audio and video signals
over the airwaves in a manner similar to a radio signal. Each station has a
single frequency over which to broadcast its analog television signal. You know
these frequencies as channel numbers on your TV. Like radio signals, an analog
TV signal can experience interference with their frequencies. This can cause
static, snow, or ghosting on a channel. It can also cause fluctuations in
color, brightness, and sound quality. And like a radio signals, analog
transmission declines the further away you are from the source.
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A
Digital TV signal, on the other hand, transmits in “packets” of compressed
data. The data uses a combination of 1’s and 0’s, similar to your computer, DVD
player, and Internet. Because it uses this code, digital signals do not
experience the same interference, or signal loss, that analog TV signals do.
That means you enjoy a consistently clear picture, high-quality audio, and no
static or snow.
A
Digital TV signal is also a more efficient technology. A digital transmission
requires less bandwidth when compared to a similar Analog signal. In fact,
four or
more digital channels use the same bandwidth as a single analog channel. This
allows a television station to broadcast more channels and more HD channels
over the same airwaves, giving you more variety of programming with better
quality.
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Another
difference between Digital and Analog is the ability for digital signals to
broadcast programming in a true HD widescreen (16:9) format. This allows you to
experience movie quality programming at home. Analog signals on the other hand
are transmitted in 4:3 aspect ratio. Meaning the picture is 4 units wide for
every 3 units of height. So on a HDTV, you will see black bars on the
sides of your TV picture when analog programming is broadcast.
Unfortunately,
digital TV transmissions cannot be received by older analog TVs. To receive
digital TV signals, you must have a newer TV with a digital tuner built-in it
or a digital-to-analog converter box. The set-top converter box will
automatically convert the digital signal into something your older TV can
display.
Established
in 2000, the Soukacatv.com main products are modulators both in analog and
digital ones, amplifier and combiner. For more,
please access to https://www.soukacatv.com.
CONTACT US
Dingshengwei Electronics Co., Ltd
Company Address: Building A, the first industry park of
Guanlong, Xili Town, Nanshan, Shenzhen, Guangdong, China
Tel: +86 0755 26909863
Fax: +86 0755 26984949
Phone: +86 13410066011
Email:ken@soukacatv.com
Skype:
soukaken
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