Which screen size, color depth and refresh rate do you want?If I want to transmit live video via radio waves, what is the lowest frequency that has enough bandwidth to transmit live video?
Let's assume he is asking,The radio waves are shared by all of us. It is not good for one person to transmit on just any frequency. You could be at the police band or fire truck frequencies.
I really want you to list the parameters.There are way too many parameters involved to give you a definite answer.
Hams transmit SSTV (slow scan TV) at low frequencies, 2-10MHz.
Analog TV broadcast channels start at 40MHz.
Assuming a 200 x 200 pixel screen and 15 frames per second, that's 15 * 40k pixels and 1-bit "color", you'll need 2MHz plus some more for timing if your data signal is your carrier signal and you use some type of amplitude modulation to achieve this. However, transmitting such a signal becomes difficult - especially as range increases because of significant distortion of the encoded signal.What is the lowest frequency, that can theoritically transmit live video( that is black and white and has a resolution of 40,000 pixels) over a distance of 100 miles, without a repeater?
What frame rate? What kind of compression? If you are really looking to transmit at a low carrier frequency, you want to use the minimum frame rate that is acceptable and use as much compression as you can.What is the lowest frequency, that can theoritically transmit live video( that is black and white and has a resolution of 40,000 pixels) over a distance of 100 miles, without a repeater?
Just trying to make sure I understand the response, so if I transmit a 200 x 200 image, that is a black and white image at 15 frames per second, I will need a 2 megahertz bandwidth signal, not including timing information?Assuming a 200 x 200 pixel screen and 15 frames per second, that's 15 * 40k pixels and 1-bit "color", you'll need 2MHz plus some more for timing if your data signal is your carrier signal and you use some type of amplitude modulation to achieve this. However, transmitting such a signal becomes difficult - especially as range increases because of significant distortion of the encoded signal.
if you wish to encode the 2M bits of data needed for 15 frames per second - you'll need a carrier frequency that is somewhat (5x to 10x) higher as a minimum for ASK or much higher if you want FM. If you want more gray scale depth, then you'll need to transmit 4x the number of bits for 16 shades of gray per pixel.
which class is thus for?
It depends. What encoding will you use? And, as I said, that method with no carrier frequency will not reach your 100 mile target with reasonable transmitter efficiency. .Just trying to make sure I understand the response, so if I transmit a 200 x 200 image, that is a black and white image at 15 frames per second, I will need a 2 megahertz bandwidth signal, not including timing information?
You asked what kind of compression. Can you give me a list of the compression techniques, that I could use to transmit video information via radio waves?What frame rate? What kind of compression? If you are really looking to transmit at a low carrier frequency, you want to use the minimum frame rate that is acceptable and use as much compression as you can.
Then there's the matter of what encoding you are going to use and what modulation technique.
How much power are you going to use? The higher the signal to noise ratio, the more bits you can cram into one symbol and the further away it can be picked up by a distant receiver.
Which brings up the question of how sensitive is the receiver?
Is the transmitter using a directional antenna, or an omni?
What about the receiver?
You can probably do it with 1 MHz given your frame rate, and that would include timing pulsesJust trying to make sure I understand the response, so if I transmit a 200 x 200 image, that is a black and white image at 15 frames per second, I will need a 2 megahertz bandwidth signal, not including timing information?
No. They invented Google for a reason.You asked what kind of compression. Can you give me a list of the compression techniques, that I could use to transmit video information via radio waves?