Is there a difference between a radio signal and an image signal?

Answer 1

A radio signal has less information than a image signal, but otherwise they are both the same.

Radio signals are created by a transmitter. They are on the same radiation spectrum as light, microwaves, and radar etc.

In a radio transmission only the audio signal has to be sent. It is done so in two fashions either AM or FM. An AM frequency is a signal that uses the increase and decrease in the wave height to carry the audio signal. It had the problem of not being able to transmit as far as or as clear as an FM signal. FM uses the distance between the waves to carry its information. Two signals can be sent with a FM system to create stereo. If a stereo signal were sent on an AM station then it would require two stations, one to send each channel. If both signals were sent out on the same station then they would add to each other and just create noise. Think of a bouncing ball. If two balls are bouncing at the same time with a different distance between them then they can both bounce along the same line (station). If two balls were bouncing at the same time and at the same distance they would hit each other and stop bouncing along the line. FM signals use the difference distance between each ball or wave (frequency). AM signals try to bounce on top of each other and so can interfere with each other, they use the amplitude (height) of the wave to carry the signal.

For a radio or TV station frequency means where on the electromagnetic system the signal would lie. On the graph of a radio or TV signal the frequency is the distance between each wavelength. So talking about frequencies can be confusing. A frequency can be the station or a description of how the signal is broadcast on that station.

Television signals use the same method as FM signals to carry the information. They pack more into the signal so that the large amount of image information can be carried. The FM style of broadcasting can pack more information on one station than an AM style signal can hold.

See this chart: http://en.wikipedia.org/wiki/Radio_frequencies_and_wavelengths
To understand which type of station broadcasts for the various forms of communication.

TV signals use VHF (Very High Frequencies) and UHF (Ultra High Frequencies) to carry their signal. Like AM signals UHF can get lost in the clutter of buildings easier so it doesn't transmit a clear signal as far as a VHF station can.

Also a TV doesn’t receive just one signal from one spot on the electromagnetic spectrum, lie a radio does. Each station on the TV receives several substations at the same time. These substations are all very close to each other and allow more information to be sent. HD TV signals use an improvement in technology to pack more information onto this range of sub stations. The national networks wanted to use this “extra space” to broadcast more stations, but congress said no you have to use that “extra space” to broadcast a better signal.

A radio signal has less information than a TV signal and it can be broadcast on a single station. A TV signal requires so much information for the image that it needs a few substations that are close together. A HD signal packs even more data in the substations that a TV receives.

Digital signals are different than Analog signals. Radios receive analog signals. Satellite radios receive digital signals, which can carry more data. The same is true with TV Satellites the signals are digital and carry more data. Digital signals can be sent all on the same wavelength or the same point on the electromagnetic spectrum. A radio uses a simple antenna, a TV needs a better antenna, but a UHF signal can be received with a simple loop. This is all due to the signals point on the electromagnetic signal. That’s why a satellite dish is needed to receive satellite signals. Even if you had the receiver box to decode the digital signal, you need a satellite dish to catch all of the signal.

Answer 2

ummmm..... interesting comparison LOL

Radio Signal has to be in the "Radio" range of the Electromagnetic Spectrum and has to be "Modulated" with the signal to transmit.

An "Image" signal can be transmitted at just about any frequency as long as the transmitting device and receiving device are "sync'd".

Answer 3

first it's not so simple to explain such questions in brief words
but the main deference is the image signal need more bandwidth or speed(depend on the way we used to transfer information) it is like you want to describe to another person a short street and large town (so you may talk too much or speedy to describe the town) i am sorry if it's not clear due to my language!