Question: Am And Fm Modulation Viva Questions?

What is modulation AM and FM?

In AM, a radio wave is known as the “carrier” or “carrier wave ” is modulated in amplitude by the signal that is to be transmitted. In FM, a radio wave is known as the “carrier” or “carrier wave” is modulated in frequency by the signal that is to be transmitted. The amplitude and phase remain the same.

Which modulation is better AM or FM?

FM has better sound quality due to higher bandwidth. Twice the highest modulating frequency. In AM radio broadcasting, the modulating signal has bandwidth of 15kHz, and hence the bandwidth of an amplitude-modulated signal is 30kHz. Twice the sum of the modulating signal frequency and the frequency deviation.

What is AM modulation used for?

Modulate a Carrier Amplitude modulation (AM) is also widely used to alter a carrier wave to transmit data. For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center frequency (the station’s channel) is varied (modulated) by the analog audio signal. AM is also used for digital data.

You might be interested:  Quick Answer: A Fm Radio Or An Fm Radio Grammar?

What is AM and FM explain where do we use it?

Amplitude modulation and frequency modulation are used to transmit data using the method of modifying a carrier signal. For instance, if several different sets of data are required to be transmitted using the same medium, then each set off is sent using different frequency waves.

What are the types of FM?

There are two different types of frequency modulation used in telecommunications: analog frequency modulation and digital frequency modulation.

What is difference between AM and FM?

FM vs AM: What’s the difference? FM radio works the same way that AM radio works. The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information.

What are the advantages of FM?

The main advantages of FM over AM are:

  • Improved signal to noise ratio (about 25dB) w.r.t. to man made interference.
  • Smaller geographical interference between neighboring stations.
  • Less radiated power.
  • Well defined service areas for given transmitter power.

Why does AM radio exist?

The decline in AM audio was due more to regulation than to method of modulation. One aspect of radio not understood by most listeners is the concept of occupied bandwidth, or the amount of spectrum that a station uses to transmit its signal. It displays signals within a specified range of frequencies.

Why is AM radio bad quality?

AM stands for Amplitude Modulation and has poorer sound quality compared with FM, but it is cheaper to transmit and can be sent over long distances — especially at night. The lower frequencies of the band we use for AM signals creates a wavelength that is extremely large.

You might be interested:  Quick Answer: Am Fm Cd Player Radio Resets Daylight Savings?

Is AM modulation still used?

Amplitude modulation applications Broadcast transmissions: AM is still widely used for broadcasting on the long, medium and short wave bands. Using a lower bandwidth and providing more effective use of the transmitted power this form of modulation is still used for many point to point HF links.

What is the need of modulation?

Modulation is simply a widely used process in communication systems in which a very high-frequency carrier wave is used to transmit the low-frequency message signal so that the transmitted signal continues to have all the information contained in the original message signal.

WHY IS AM used for broadcasting?

AM is used for broadcasting because its use avoids receiver complexity. Only a diode and a capacitor are sufficient to separate the audio signal from the AM wave.

What is the full meaning of FM?

: a broadcasting system using frequency modulation also: a radio receiver of such a system. FM.

Is shortwave AM or FM?

It’s called shortwave because, quite literally, the waves emitted are short as opposed to long wave and medium wave, used by AM radio, and wideband VHF (very high frequency) used by FM radio. These short waves can travel thousands of miles across the globe, so shortwave radio is, by nature, international.

What is FM generation?

FM signals can be generated using either direct or indirect frequency modulation: Direct FM modulation can be achieved by directly feeding the message into the input of a voltage-controlled oscillator. For indirect FM modulation, the message signal is integrated to generate a phase-modulated signal.

Leave a Reply

Your email address will not be published. Required fields are marked *