Mell What is relation of modulating frequency and carrier frequency?
2.2 Frequency and Phase Modulation FM consists of a carrier frequency and an infinite number of sideband components spaced at intervals equal to integer multiples of the modulating frequency. Therefore, theoretically, the bandwidth of an FM signal is infinite.
What is the relation between the message signal frequency and the carrier signal frequency?
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.
What is the power relationship between the carrier and the modulating signal in AM?
If the modulation index μ=1 then the power of AM wave is equal to 1.5 times the carrier power. So, the power required for transmitting an AM wave is 1.5 times the carrier power for a perfect modulation.
What is the another name of modulating signal?
The amplitude modulation is called amplitude shift keying (ASK), when the data signal is a digital signal.
What is the purpose of modulating a signal in transmission?
The carrier is higher in frequency than the modulation signal. The purpose of modulation is to impress the information on the carrier wave, which is used to carry the information to another location. In radio communication the modulated carrier is transmitted through space as a radio wave to a radio receiver.
What is the bandwidth of AM signal?
The full audio spectrum ranges up to 20 kHz, but AM radio limits the upper modulating frequency to 5 kHz. This results in a maximum bandwidth of 10 kHz.
What is a signal frequency?
Frequency is the rate at which current changes direction per second. It is measured in hertz (Hz), an international unit of measure where 1 hertz is equal to 1 cycle per second. Hertz (Hz) = One hertz is equal to one cycle per second. Period = The time required to produce one complete cycle of a waveform.
What is the purpose of carrier frequency?
The purpose of the carrier is usually either to transmit the information through space as an electromagnetic wave (as in radio communication), or to allow several carriers at different frequencies to share a common physical transmission medium by frequency division multiplexing (as in a cable television system).
What is the relation between modulation signal and carrier signal?
The frequency of the carrier signal is usually 50 to 100 times greater than that of the modulating (message) signal. This factor, however, varies. The modulation index (mu) gives the ratio of the amplitudes of the modulating signal and the carrier signal.
How is carrier frequency related to transmission distance?
When transmission distance increases the signal tends to lose power, so carrier signal is added along with the message signal ( to strengthen the original message signal). Is that true? Even in vacuum, there exists an attenuation that is inversely proportional to the frequency squared of the signal.
Why is carrier signal cannot have frequency less than message?
Carrier signal frequency = 2800KHz message signal frequency = 3KHz the two generated sidebands will be, 2800 + 3 = 2803 KHz 2800 – 3 = 2797 KHz and eventually, the bandwidth of the signal is,
What is the relationship between the message frequencies?
If I take a message signal of frequency F m e s and use it to generate a FM signal with a VCO, which has a rest frequency of F r and a deviation frequency of F d, what is the relationship between the rest frequency F r and the message frequency F m e s? Or am I completely off?