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AM modulation produces separate frequencies because you are effectively mixing two signals together, the carrier and the signal. Recall that Fourier Analysis states that, if you mix two sinusoidal waveforms together, you can a frequency distribution of four waves - the original two - their sum - and their difference. In normal AM modulation, the carrier is much higher in frequency than the signal, so the sum and difference are not far from the carrier, but you can still pick them out with a sufficiently precise spectrum analyzer.
What else can I help you with?
Is mixing the same as amplitude modulation?
No, mixing is adding two signals together, modulation is more like multiplying two signals. IN mixing, the result has the same frequencies as the input signals. In modulation, the result is the sum and difference frequencies.
What is fidelity in frequency modulation?
Fidelity is the quality with which the original frequencies are reproduced at the receiver.
What are the applications of frequency modulation of sound?
radio stations operating at various frequencies.
AM wave frequencies are?
AM stands for Amplitude Modulation. Whatever radio frequency you use, a single frequency would just produce silence at the receiver. You need to superimpose sound frequencies onto the carrier wave. Amplitude modulation does this by varying the Amplitude (strength, power) of the radio carrier wave in time with audio frequency. AM is therefore the kind of 'coding' used and has nothing to do with frequency. By convention, amplitude modulation is mostly used in the medium and long, radio waves. From 150 to 1600 Khz. AM is also used for air band communications at 121Mhz, whereas FM is used at marine frequencies of 156Mhz.
What does AM mean on the radio?
Amplitude Modulation, the method of sending information through radio frequencies.
Are the frequencies of FM stations lower than the frequencies of am stations?
No, the frequencies of FM (Frequency Modulation) stations are not lower than those of AM (Amplitude Modulation) stations. FM stations typically operate in the VHF band, usually between 88 MHz and 108 MHz, while AM stations operate in the medium wave band, typically between 530 kHz and 1700 kHz. Therefore, FM frequencies are significantly higher than AM frequencies.
What were the bell 101 modulation frequencies?
The Bell 101, an early experimental digital communication system developed by Bell Labs, utilized modulation frequencies of 1, 2, and 3 kHz. These frequencies were employed to encode digital information into audio tones, allowing for the transmission of data over telephone lines. This modulation scheme was part of the early advancements in digital communication technology, paving the way for future developments in data transmission.
What is the main use of frequency modulation?
Frequency modulation is used to broadcast radio waves to receivers. The most common use of it is in FM radio, which contains a range of radio frequencies.
Why pre emphasis is done after modulation?
No, Pre-emphasis is done before modulation. We need it to do for improving the SNR ratio of the signals of higher frequencies. Actually this boosting of weaker higher frequencies of data signals. (Asked question is a sort of trap question usually asked in viva or interview.... ;) )
What is the difference between the standard amplitude modulation linear addition and multiplication of signals?
In modulation u r sending two signals but their frequencies are sum or difference of carrier frequency and signal frequency.In addition u send two signals at two different frequencies so more interference.
What produce when overtones have frequencies that whole number multiples of the fundamental?
Harmonic frequencies.
Difference between FM and PM?
frequency of the carrier is varied in accordance to the message signal in FM. Fm receivers are less complex. in Fm lower frequencies produce variation to the modulation index. phase of the carrier is varied in accordance to the message signal in PM. Pm receivers require proper synchronization so it is complex. Modulation index is independent of audio frequency
