Results for: Sideband

Answered

What are the disadvantages of single sideband AM transmission?

An AM transmission, viewed on a spectrum analyser, has a carrier and two sidebands. AM transmissions are easy to generate, transmit and receive. This is the advantage of AM. A… (MORE)

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In Wireless Communication

What is the difference in the usefulness of upper-sideband and lower sideband transmission?

There's no difference in their usefulness, and no basis for any preference on the part of the transmitting party. There's an advantage to the receiving party, however, if … (MORE)

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In Electronics Engineering

If the frequency in AM does not change then how are these sidebands formed?

The process of changing the amplitude of the "carrier" so as to add information to it (modulation) doesn't change the frequency of the carrier. But it does create energy at tw… (MORE)

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In Electronics Engineering

How does single sideband differ from standard AM?

Single Sideband is effectively the same as standard AM, except that the carrier and one of the two sidebands is suppressed. This allows you to put more power into the informat… (MORE)

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In Uncategorized

Which are the applications of vestigial sideband?

Vestigial Sideband Transmission is used for the transmission of Television signals.Because the video signals need a large transmission bandwidth if transmitted using DSB-FC or… (MORE)

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In Electronics Engineering

How single sideband is being generated?

In regards to the radio transmission mode, SSB is an improvement of AM, and there are generally three ways single sideband can be generated -- filtering out the unwanted sideb… (MORE)

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In Electronics Engineering

How does double sideband differ from standard AM?

Standard AM already has double sideband. When you talk about double sideband, however, often the meaning is usually "double sideband, suppressed carrier". By suppressing the c… (MORE)

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In Technology

Why FM have infinte number of sidebands?

It can't. . Â . FM (like broadcast AM) has two *sidebands*, one at a higher frequency than the transmitter's carrier, one at a lower frequency. . Â . The modulating …signal (voice, music, etc) of any trasnmitter creates one or more pairs of side frequencies within the two sidebands. . Â . A broadcast AM signal can only produce two side frequencies, so an AM transmitter at 1.5 MHz, with a 1 kHz modulating tone (fm), would put out its carrier (fc) at 1.5 MHz, a lower side frequncy at (1.5 - 0.001) = 1.499 MHz, then its carrier at 1.5 MHz, and then the upper side frequency at (1.5 + 0.001) = 1.501 MHz. . Â . The AM signal can never be wider than twice the highest modulating frequency (fm), spanning from (fc - fm) to (fc + fm), a span of 2 x fm. Be aware that special-purpose AM systems can generate just *one* sideband - we won't go into that amount of detail apart from noting it. . Â . FM signals can be wider than twice the highest modulating frequency. The complete analysis needs the mathematical Fourier Transform, but we can think of it this way. . Â . Stronger frequency modulation shows up as a larger change in the transmitted signal frequency. An FM signal at 100 MHz, modulated by a 1 KHz tone, *can* put out a lower side frequency at (100 - 0.001) = 99.999 MHz and an upper side frequency at (100 + 0.001) = 100.001 MHz. . Â . You could receive this just fine, but it would sound "weak" compared to normal broadcasts. . Â . It's possible to increase the frequency shift to (say) five times. Now, the sidebands must extend from (100 - 5x0.001) = 99.995 MHz to (100 + 5x0.001) = 100.005 MHz. How do we account for the original 1 KHz tone creating a bandwidth of 2x5 kHz? . Â . The answer is that we actually have *five* lower side frequencies, at -5, -4, -3, -2, -1 kHz below the carrier, and *five* upper side frequencies at +1, +2, +3 +4 and +5 kHz above the carrier. Notice that they are multiples of the original 1 kHz modulating frequency. These can, in fact, be shown on the instrument called a spectrum analyser. . Â . Your question? . Â . As with broadcast AM, an FM signal has only two sidebands. In FM, the strength of modulation (the modulation index) controls the number of individual side frequencies, and thus the total bandwidth of the signal. . Â . Can an FM signal have *infinite* numbers of side frequencies? . Â . Not really. It can have a *very large* number of side frequencies with very great modulation strength. In practice, this would take up *a lot* of the FM radio band, so broadcast FM commonly uses a maximum modulation index of 5.0. This means that a fully-modulating 15 kHz signal would give a bandwidth of -(15 x 5) to +(15 x 5) kHz, which is +/- 75 kHz. . Â (MORE)

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In Math and Arithmetic

Why you are suppressing the 2 sidebands of dsbsc?

The sidebands are not suppressed in DSB-SC ... that's where the information is !. The carrier is suppressed, and only the sidebands are transmitted. The main advantage … (MORE)

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In Uncategorized

What causes sideband frequency?

\n. If you subtract from the carrier frequency the frequency of the tone that modulates it, then filter out the carrier frequency, then you have a lower sideband frequency. … (MORE)