A phase locked loop (PLL) is a system that adjusts the frequency of an output signal to match the input signal using a variable frequency oscillator and detector. This creates a stable loop and is used in telecommunications and electronic devices to improve reception and efficiency.
A phase locked loop (PLL) is a type of balancing system that serves to adjust the frequency of an output signal to be comparable to the input signal generated by the same equipment. Carrying out this process involves the use of what is known as a variable frequency oscillator coupled with a detector capable of reading both signals. Together, these components work as a single circuit to read and handle signals to create a stable loop.
The process of creating a phase locked loop involves tracking the two signals involved, identifying the frequencies, and then modulating the frequencies so that they essentially work in tune with each other. The ability to create this type of locked loop situation makes possible a number of electronic multimedia applications. For example, the ability to establish a phase locked loop helps establish a clear radio signal even if there is a lot of background noise and static in the transmission. In a sense, the loop allows the input and output signals in the transmission to be modulated so that the actual communication is clear.
A phase locked loop is also used in other types of communication situations. With general telecommunications, including wired and wireless telephone communications, this frequency manipulation process helps avoid or at least minimize some of the audio problems that can occur. This includes echoing on the line, a phenomenon known as cut-in and cut-out, and even sudden screeching noises that drown out any attempts at communication. With much of telecommunications using digital technology rather than older analog technology, the need to establish a phase-locked loop to improve reception is more important than ever.
The use of a phase-locked circuit is also important for the operation of many electronic devices, including computers of various types. By creating a stable circuit, the level of efficiency is maintained while the overload potential of the circuit is minimized. As long as the circuit can reconcile the input and output signals to be comparable, the flow to and from the device will remain within reasonable safe parameters. This ensures efficient operation as well as preventing an unreasonable amount of stress on the circuitry which could cause permanent damage to the device, requiring the replacement of all or at least some of the components.
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