In the physical world, resonance can generally be observed as the frequency-dependent cyclic exchanging of energy between potential (stored) and kinetic (active) forms. A pendulum is a basic example: at either end of its swing a pendulum exhibits purely its maximal stored potential energy while momentarily there is zero (kinetic) motion; at mid-swing there is no storage (potential) and all energy is kinetic, in motion. Each form of energy has two opposing modes: potential has the two opposite extremes of the swing; kinetic, the two different directions of swing. The amplitudes of the two forms of energy are in quadrature, a 90° cyclic relationship; when charted, the two energy levels trace out sine and cosine forms.
In the real world, when continually given new energy with proper timing, a pendulum will swing indefinitely. If the outside source of energy is taken away, the resonance will decay: friction (resistance; damping) will slow and eventually stop the swinging. Within the limits of swing amplitude, the frequency of the pendulum's motion remains the same. If you see such a back-and-forth, energy-trading relationship, there is likely resonance going on. Freezing can possibly be seen as energy storage and stretching can possibly be seen as activity, but unless one ‘feeds' the other and vice-versa, it’s probably not resonance. (I will be pleased if someone corrects any false assumption I have made.) David Reaves On Sun, 22 Jul 2018 22:05:48 -0400 charles morrow <c...@cmorrow.com <mailto:c...@cmorrow.com>> wrote: > > How about freezing and stretching moments. Is this resonance?
_______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
