Originally Posted by snowdog 88
I still don't fully understand this mobile TV. I don't hear much about it or know anyone that uses it. Why can't mobile TV's use the regular OTA channels that are out there right now? Is the mobile TV's picture transmitted at a resolution of 240? Can it be received on a smart phone? Do we really need to be connected to some sort of media everywhere we go? 24 hours a day, 7 days a week?
Where is this Dish 56 broadcasting from? I don't get any indication that it exists at my house. And since regular TV's will not decode the mobile TV signal, will rescanning pick this channel up with a no signal message or will it ignore it?
Long winded post, lets see if I can cover this completely:
Reason why you don't hear much about mobile TV is because between of the pay TV providers, phone makers, and cellcos, they don't want you to have access to free TV on your phone. Money and lobbying speaks and no mobile TV in your phones. At best there's a few largely unheard of devices and dongles in the market to manage it. It's annoying really. I'd love to have the OPTION to use it if I choose. Not that I'd use it 24/7 but I'd pay a premium to have a phone with the hardware in it for that occasional use. Sadly...
Why can't they just view existing OTA? The existing signal is horrendous for mobile viewing. In a stationary position like your house it is fine but on the move the multipath issues are crazy. The M/H standard adds in extra error correction to overcome this. Not to mention for existing OTA feeds you'd need hardware in each device that could decode and downconvert (for existing lowres screens) high bitrate 720/1080 MPEG2 signsls and do so with minimal battery usage. Rather it is much easier to take a small chunk of the 18mbit bandwidth alotted and transmit a widescreen 240 or 480p h264 video stream with AAC audio that just about every mobile device these days can do without breaking a sweat. So you just need the tuner hardware and feed the bits to the phone to work with.
It should be noted if you don't know this already but all mobile streams are on the same existing transmitters so barring antenna efficiency in your device, it is the same signal being received by your household antenna. Your TV won't see the M/H stream since it is a completely different format but it is in those bits being sent to it.
You can check out Trip's site and the station details include the data on Mobile TV broadcasts. For example, WCMH here has a Mobile TV signal. Actual video stream is 340kbps and audio is 48kbps for a total of 388kbps barring overhead. The full 'payload' is 1.35mbps taken out of the 18mbps stream. That extra bandwidth difference is for the error correction mentioned. And actual bandwidth taken from the primary OTA broadcast is minimal.