Can an information signal has a higher frequency than that of the carrier signal?

In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an information-bearing signal for the purpose of conveying information. This carrier wave usually has a much higher frequency than the input signal does.

What is the relationship between carrier frequency and the signal bandwidth?

When an audio signal is superimposed on an RF carrier, sidebands at the sum and difference of the carrier frequency are produced. The transmitted signal is therefore distributed in frequency over a bandwidth that is equal to twice the highest frequency in the signal.

What happens when amplitude of modulating signal is higher than carrier signal?

When the amplitude of the modulating signal is greater than the amplitude of the carrier, distortion will occur. 5. What is the effect of distortion? Explanation: Distortion occurs when the modulating signal amplitude is greater than the amplitude of the carrier, causing incorrect information to be transmitted.

Why carrier frequency is always higher than message?

To increase the energy of the signal we need to increase the frequency. This is achieved by multiplying the message signal with the carrier signal (with high frequency). this is when the carrier frequency is higher , and we noticed that bandwidth is just twice of the highest frequency of modulating signal.

Why high frequency carrier is needed for modulation?

High frequency carrier waves are needed for effective transmission of information signals because they: *help in maintaining a practical size for the transmitting antenna and avoid it being very long. *increase the power that is radiated by the antenna to enhance the transmission range.

Why higher-frequency has higher bandwidth?

Higher-frequency signals make more crossings, and therefore can represent more symbols. And that is why millimeter wave signals have such high bandwidth: there are simply so many more zero crossings in any unit of time, compared to lower-frequency signals (600 MHz to 800 MHz or 2-GHz, for example).

What is high frequency carrier?

For the transmission of audio signals at distant places, the high frequency carrier waves are used, because these frequency carrier waves travel through space or medium with the speed of light and they are not obstructed by earth’s atmosphere.

Why does the frequency of the carrier change?

In frequency modulation, the carrier amplitude remains constant, but its frequency is changed in accordance with the modulating signal. Specifically, the higher the amplitude of the information signal, the greater the frequency change.

What is the effect on the frequency modulated carrier when the frequency of the modulating signal FM is doubled?

When the modulating frequency is doubled the modulation index is halved and the modulating voltage remains constant.

What are the advantages of using a high frequency carrier for transmission?

Advantage of using a high frequency carrier wave is The main advantage of high frequency signals is that the signal may be transmitted over very long distances and thus dissipates very less power. The antenna height required for transmission is reduced at higher frequencies.

What is the advantage of using a high frequency carrier for transmission?

Why do we need to increase the carrier frequency?

We increase the carrier frequency for the following reasons: Spectrum Availability. You send your signal where the FCC (or whatever governing body applies) says you can send it. Increased bandwidth. As the answer to your question demonstrated, to send wide-band signals you need higher carrier frequencies.

What is the frequency of the carrier wave?

The frequency of the carrier wave is carrier frequency (electromagnetic wave) . This question needs an answer that would clarify and explain why the frequency is a CARRIER OF ELECTROMAGNETIC SIGNALS THROUGH AN INSULATOR, which cannot conduct electrons !

What are carrier signals and how do they work?

This is where carrier signals come in. A carrier signal is a signal with constant frequency. Typically sinusoids. They carry little or no information by themselves. They have sufficient power and frequency to be transmitted without interference and easily.

What is the difference between carrier frequency and modulation?

A ‘carrier frequency” is a radio frequency which has no “modulation” imposed on it (yet). Modulation is a process whereby “intelligence” such as speech. music. video, pulses, etc., is impressed onto the carrier frequency by varying some characteristic of the signal – amplitude, frequency, of-off keying etc.