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Why the automatic frequency control function is usually not necessary in today's FM receivers?
AFC was used to provide an electronic means to stabilize the frequency of a circuit. Older receivers and transmitters used a tank circuit, made of an inductor and capacitor to select frequency. Since both the inductor and capacitor are physical objects, their sizes and properties vary with temperature, humidity, age and other factors. Also to be able to tune the frequency, at least one of them had to be deliberately made to be mechanically alterable to change it's electrical properties. These factors caused the frequency to slowly drift over time. Also, the tuning was usually accomplished in a continuously variable way, so it was difficult to confirm an exact tuning to the station which could lead to loss of sensitivity or distortion of the signal. AFC used electronic feedback to fine tune the tank circuit by a (usually) electrically tuned component.
Modern radio equipment tends to use a quartz crystal oscillator of a fixed frequency as a reference. Quartz crystals can easily be made stable in frequency to 50 parts per million. This is sufficiently accurate to not need to compare it with the frequency of the incoming signal, itself derived from a stable crystal source. The radio is usually tuned by a frequency synthesizer controlled by the crystal.
Both AFC and the frequency synthesizer method use an electrically tuned variable frequency oscillator to tune the radio. The difference is that AFC used characteristics of the received signal to measure and correct the mistuning, while frequency synthesizers compare the tuning with crystal reference. AFC cannot find the frequency you desire to tune, it only fine tunes it once you select it. The frequency synthesizer accurately tunes the radio to whatever frequency you ask it.
What else can I help you with?
How can a pitch of a sound change?
Pitch is the music categorization of frequency. Frequency is the repeating rate of vibrations. The higher the pitch, the higher the frequency, i.e., the faster the vibrations. The lower the pitch, the lower the vibration rate.
What is the function of a tweeter in a speaker in the production of sound quality?
Tweeter carries HF sound in the multichannel audio. It is smaller in size and reproduce frequency content upto 65kHz. The LF sound is carried by the sub-woofers and the LFE channel. The LF is usually composed of bass sound.
The rate at which something vibrates?
Is different depending on the material's length, thickness and the forcing function. Each of the 5 guitar strings, for example, vibrates at a different frequency also known as pitch. Additionally, you can change the pitch of a given string by effectively shortening it when you press the string against a fret.
What does DISP on a radio mean?
DISP on a radio typically stands for "Display." It refers to a function or button that allows users to toggle between different display options or view additional information on the radio's screen, such as frequency, signal strength, or current settings. This feature enhances user experience by providing relevant data at a glance.
What is the function of folk music of mindoro?
what are function of music in mapeh
What is frequency of a periodic function?
The frequency of a periodic function is 1/Period
When you speak into the receiver of a telephone the receivers function is most like the function of which part of the neuron?
the testicle
What is the difference between transfer function and frequency transfer function?
frequency transfer function deals with transfer in frequency domain, transfer function alone can be referring to any type of transfer in different domain e.g time domain
What is the main function of Variable frequency drive?
Main function of Variable Frequency Drive is to be able to run the AC Induction motors at different speeds (by changing the frequency). The speed is a function of frequency. N - Speed. F - Frequency P - Pole N= ( 120 x F)/ P
Are infrared transmitters and receivers interchangeable?
No, infrared transmitters and receivers are not interchangeable. Each is different. This, though the two might be thought of as being mirrors of each other as regards function.
What is the function of chroma section of television?
A low-pass amplifier having a bandwidth in the range from 2 to 100 MHz. Typical applications are in television receivers, cathode-ray-tube computer terminals, and pulse amplifiers. The function of a video amplifier is to amplify a signal containing high-frequency components without introducing distortion.
What is The rate of repetition of a periodic function?
Its frequency.
Does frequency effect total inductance?
Inductance is inductance, and is not a function of frequency. Frequency affects reactance, and ultimately impedance, not inductance.
What is threshold frequency?
Threshold frequency is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect. Below this frequency, no electrons are emitted regardless of intensity. It is a characteristic property of each metal and is used to determine the work function of the metal.
How is the threshold frequency related to work function?
The threshold frequency is the minimum frequency of light required to eject electrons from a metal surface (photoelectric effect). The work function is the minimum energy needed to remove an electron from the metal surface. The threshold frequency is directly related to the work function through the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency.
Can you drive a semi automatic car with an automatic license?
Provided you could start the car, there is no reason whty you couldn't as they function almost as an automatic does.
The basic function of a transformer is to change?
The basic function of a transformer is to change voltage levels.
