dish hd set top box image
busterlong
I have a Coax cable running into the tv but the hd channels are just SD. i went to the hd settings and tried different stuff but nothing worked. is it my cable?
Answer
Coax cable CAN NOT carry HD signals to your TV from your set-top box.
You need to use either Component or HDMI.
If you don't have component cables handy, simply use any RCA cables you have around. You need 5, 3 for video and 2 for audio, just make sure you plug them correctly.
Coax cable CAN NOT carry HD signals to your TV from your set-top box.
You need to use either Component or HDMI.
If you don't have component cables handy, simply use any RCA cables you have around. You need 5, 3 for video and 2 for audio, just make sure you plug them correctly.
How can I be getting true HD TV reception when you start with COAXIAL cable from the wall?
Jack
Cable or Dish doesn't matter, the signal begins with a basic coaxial cable.....and then it goes into HD devices that convert.......Shouldn't it start with HDMI from the wall? Help me understand this?
Answer
It's important to make a distinction between the cable and the protocol. The cable is the physical wiring used to carry a signal from one place to another. The protocol is the method or language used to carry the signal over the cable.
For example, you can send an analog standard definition video signal over coaxial cable and you can also send digital Internet data packets over a coaxial cable. The protocols for those two signals are extremely different, yet both signals can be delivered over the same type of coaxial cable.
Another example of separating cable from protocol is Light Peak, Intel's brand new connection standard. Light Peak is a single type of fiber optic cable that can be used to carry signals with various protocols such as USB, Ethernet and HDMI. Even though the cable uses fiber optics and HDMI cables use copper, the same HDMI protocol can be sent over both Light Peak and HDMI cables.
Coaxial cable is actually a very high bandwidth cable. Consider that every single TV channel available from your provider must all be simultaneously sent down the same cable to your home, even if you're not watching TV at all. Coaxial is very good at handling high-bandwidth demands like this, while still having bandwidth left-over to provide bi-directional cable Internet connections and cable telephone services. For this reason, Coaxial cable is actually a very good choice for cable companies to use to deliver content to the home.
Now to continue answering your question. Why do we need a set-top box or cable tuner to access cable channels... why can't we just have an HDMI outlet that we can connect directly to the TV?
Well first of all, raw HD video connections take up an enormous amount of bandwidth (e.g. up to 10 gigabits per second per channel!!!). Even with a high bandwidth coaxial cable, it's simply not possible to deliver TV channels to the home at that bit rate.
Instead, all the TV channels are heavily compressed using sophisticated mathematical algorithms (this is lossy compression, meaning much of the original detail and color information is permanently lost). So instead of each channel taking up 10 gigabits per second, now the video can be compressed down to say 10 megabits per second (obviously much, much less).
The type of compression determines the protocol being used to send the video signal down the coaxial cable. In a typical case, the video will use the MPEG-4 protocol. So the Cable company sends down multiple MPEG-4 video streams to your house, each of which corresponds to a different TV channel.
When the signal arrives, it is received in protocol format (in this case MPEG-4) and it needs to be decoded/decompressed (and possibly decrypted) before it can be displayed on the television screen. The set-top box or cable TV tuner you have has a microchip inside that understands the video protocol that is being received and knows how to decode the protocol to recreate (a likeness of) the original video on the local display of the chosen channel (the MPEG-4 stream it 'tunes' into). This video is then output to the TV using the HDMI protocol at a bit rate of up to 10 gigabits per second.
*Note: As I said earlier, the compression is lossy, so when the set-top box decodes the video signal, it has to use various methods of extrapolation and interpolation to make-up and fill-in details that there is no information for. It's similar to how your brain fills-in your blind spots when you're driving.
*Also Note: All High Definition video sources are compressed. Just because I described how cable channels use a high level of lossy compression doesn't mean that the channels aren't HD, they still are. Even Blu-Ray movies (the highest quality HD video source for consumers) are heavily compressed, however not as heavily compressed as cable TV.
It's important to make a distinction between the cable and the protocol. The cable is the physical wiring used to carry a signal from one place to another. The protocol is the method or language used to carry the signal over the cable.
For example, you can send an analog standard definition video signal over coaxial cable and you can also send digital Internet data packets over a coaxial cable. The protocols for those two signals are extremely different, yet both signals can be delivered over the same type of coaxial cable.
Another example of separating cable from protocol is Light Peak, Intel's brand new connection standard. Light Peak is a single type of fiber optic cable that can be used to carry signals with various protocols such as USB, Ethernet and HDMI. Even though the cable uses fiber optics and HDMI cables use copper, the same HDMI protocol can be sent over both Light Peak and HDMI cables.
Coaxial cable is actually a very high bandwidth cable. Consider that every single TV channel available from your provider must all be simultaneously sent down the same cable to your home, even if you're not watching TV at all. Coaxial is very good at handling high-bandwidth demands like this, while still having bandwidth left-over to provide bi-directional cable Internet connections and cable telephone services. For this reason, Coaxial cable is actually a very good choice for cable companies to use to deliver content to the home.
Now to continue answering your question. Why do we need a set-top box or cable tuner to access cable channels... why can't we just have an HDMI outlet that we can connect directly to the TV?
Well first of all, raw HD video connections take up an enormous amount of bandwidth (e.g. up to 10 gigabits per second per channel!!!). Even with a high bandwidth coaxial cable, it's simply not possible to deliver TV channels to the home at that bit rate.
Instead, all the TV channels are heavily compressed using sophisticated mathematical algorithms (this is lossy compression, meaning much of the original detail and color information is permanently lost). So instead of each channel taking up 10 gigabits per second, now the video can be compressed down to say 10 megabits per second (obviously much, much less).
The type of compression determines the protocol being used to send the video signal down the coaxial cable. In a typical case, the video will use the MPEG-4 protocol. So the Cable company sends down multiple MPEG-4 video streams to your house, each of which corresponds to a different TV channel.
When the signal arrives, it is received in protocol format (in this case MPEG-4) and it needs to be decoded/decompressed (and possibly decrypted) before it can be displayed on the television screen. The set-top box or cable TV tuner you have has a microchip inside that understands the video protocol that is being received and knows how to decode the protocol to recreate (a likeness of) the original video on the local display of the chosen channel (the MPEG-4 stream it 'tunes' into). This video is then output to the TV using the HDMI protocol at a bit rate of up to 10 gigabits per second.
*Note: As I said earlier, the compression is lossy, so when the set-top box decodes the video signal, it has to use various methods of extrapolation and interpolation to make-up and fill-in details that there is no information for. It's similar to how your brain fills-in your blind spots when you're driving.
*Also Note: All High Definition video sources are compressed. Just because I described how cable channels use a high level of lossy compression doesn't mean that the channels aren't HD, they still are. Even Blu-Ray movies (the highest quality HD video source for consumers) are heavily compressed, however not as heavily compressed as cable TV.
Powered by Yahoo! Answers
Title Post: How do i get my HD Dish DVR to display in HD on my HDTV?
Rating: 93% based on 9658 ratings. 4 user reviews.
Author: Unknown
Thanks For Coming To My Blog
Rating: 93% based on 9658 ratings. 4 user reviews.
Author: Unknown
Thanks For Coming To My Blog
No comments:
Post a Comment