What is a PLL circuit and how does it work in home theatre systems?

    1. PLL circuits are common parts inside modern amplifiers and AV receivers.
    2. PLL (Phase-Locked Loop) refers to a zero difference between a sound input signal entering the amplifier and the output signal leaving the amplifier towards the speakers.
    3. Audio signals are usually subject to frequency distortion as the travel through the amplifier.
    4. This affects the intensity of sound reproduced by your speakers.
    5. A PLL circuit has a voltage-driven oscillator that keeps on adjusting to match the frequency or intensity of the input signal.
    6. The PLL circuit contributes to excellent audio output.



Also read: What does DSP mode mean in home theatre systems?