The position of a periodic motion relative to some standard time value. Two signals are in phase if they start at the same time. Pitch Psychological impression of the height of a sound, closely related to frequency. Propagation Refers to the process of wave movement and its characteristics in any medium. Few bits result in a distorted representation of the original signal and introduce noise.
Every system has a natural vibrating frequency.
When an external vibration acts on such a system with the same phase and similar frequency, the amplitudes add. Resonance is a kind of 'mechanical amplifier' and is used in many musical instruments. For example, the acoustic guitar has a resonator that is the body of the instrument. Signal A signal representing the most simple type of vibration called simple harmonic motion . It has the shape of a sine.