- Why does FM sound so bad?
- How is FM signal generated?
- What is bandwidth in a signal?
- What is difference between AM and FM?
- Does AM or FM travel further?
- What is the bandwidth of FM signal?
- What are the types of FM?
- What is meant by bandwidth?
- How do you modulate a signal?
- What are the advantages of FM over AM?
- How is bandwidth of a signal calculated?
- How is FM bandwidth calculated?
- How is frequency modulation done?
- Does higher frequency mean more bandwidth?
- What is peak frequency?
- What are the advantages and disadvantages of FM?
- Why is FM immune to noise?
- What is the ideal bandwidth of FM wave?
- Why does FM need more bandwidth than AM?
- What is effective bandwidth?
Why does FM sound so bad?
One of the reasons FM radio ‘sounds so bad’ is because the source material is bad.
In the late 1990’s, stations (and radio companies that own local station ‘clusters’) began going from CDs (and the few carts left) to Music On Hard Drive..
How is FM signal generated?
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.
What is bandwidth in a signal?
Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency.
What is difference between AM and FM?
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. With FM, the frequency (the number of times each second that the current changes direction) of the carrier signal is varied.
Does AM or FM travel further?
The difference in the way AM and FM radio signals are encoded means differences in sound quality, performance, and broadcast range between the two types of station. This explains why FM stations sound better than AM stations, but AM stations can be heard from further away.
What is the bandwidth of FM signal?
The bandwidth of an FM signal is not as straightforward to calculate as that of an AM signal. To take the example of a typical broadcast FM signal that has a deviation of ±75kHz and a maximum modulation frequency of 15 kHz, the bandwidth of 98% of the power approximates to 2 (75 + 15) = 180kHz.
What are the types of FM?
There are different types of FM demodulators including:Slope Detector.Foster-Seeley Discriminator.Ratio Detector.Pulse-Averaging Discriminators.Quadrature Detectors.Phase-Locked Loops.
What is meant by bandwidth?
The maximum amount of data transmitted over an internet connection in a given amount of time. Bandwidth is often mistaken for internet speed when it’s actually the volume of information that can be sent over a connection in a measured amount of time – calculated in megabits per second (Mbps). Modal.
How do you modulate a signal?
First, a user can tweak the height of the carrier. If an input signal’s height varies with the loudness of a user’s voice and then adds this to the carrier, then the carrier’s amplitude will change corresponding to the input signal that’s been fed into it. This is called amplitude modulation or AM.
What are the advantages of FM over AM?
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.
How is bandwidth of a signal calculated?
The bandwidth of a signal is defined as the difference between the upper and lower frequencies of a signal generated. As seen from the above representation, Bandwidth (B) of the signal is equal to the difference between the higher or upper-frequency (fH) and the lower frequency (fL).
How is FM bandwidth calculated?
The bandwidth required by FM is quite high.FM bandwidth = 2 [Δf + fm].
How is frequency modulation done?
To generate a frequency modulated signal, the frequency of the radio carrier is changed in line with the amplitude of the incoming audio signal. When the audio signal is modulated onto the radio frequency carrier, the new radio frequency signal moves up and down in frequency.
Does higher frequency mean more bandwidth?
Higher Frequencies Have More Bandwidth Higher-frequency transmissions have more bandwidth than lower-frequency transmissions, which means higher-frequency transmissions can send substantially more data between devices in less time.
What is peak frequency?
The frequency (period/wavelength) of waves represented by a peak (maximum energy) in the wave spectrum; sometimes known as the dominant frequency.
What are the advantages and disadvantages of FM?
Advantages and Disadvantages of Frequency ModulationAdvantagesDisadvantagesPower Consumption is less as compared to AM.The receiving are of FM signal is small.Adjacent FM channels are separated by guard bands.The antennas for FM systems should be kept close for better communication.1 more row
Why is FM immune to noise?
Due to this noise signal there is some change in the amplitude of the fm wave signal. But the fm wave does not contain signal in the amplitude variation all the information is stored in the frequency vairation. so it is more immune to noise .
What is the ideal bandwidth of FM wave?
The frequency band for FM radio is about 88 to 108 MHz. The information signal is music and voice which falls in the audio spectrum. The full audio spectrum ranges form 20 to 20,000 Hz, but FM radio limits the upper modulating frequency to 15 kHz (cf.
Why does FM need more bandwidth than AM?
FM is less prone to interference than AM. However, FM signals are impacted by physical barriers. FM has better sound quality due to higher bandwidth. … In AM radio broadcasting, the modulating signal has bandwidth of 15kHz, and hence the bandwidth of an amplitude-modulated signal is 30kHz.
What is effective bandwidth?
Effective bandwidth = Message size / Total latency. Total latency = Sender overhead + Time of flight + Transmission time + Receiver overhead. Unlike raw bandwidth, effective bandwidth takes into account the sender/receiver overhead and the time of. flight.