In Reply to: RE: Did you know that... posted by Inmate51 on March 13, 2012 at 08:42:21:
If one were to produce a signal at say 30KHz and another at say 30.1KHz, there IS a 100hz beat (amplitude modulation ) effect BUT only when there is non-linearity, does the 100Hz become audible.Non-linearity produces a sum and difference frequency when two signals add, a beat frequency is the rate of amplitude modulation of two periodically adding and canceling signals such as one note played on two nearly in tune guitar strings.
Air in not the only thing that can be non-linear too, ultrasonic energy within an audio system can cause other audible effects when the system has significant non-linearity.
Amplifiers for example normally have a small series choke at the output with the intention of DE-coupling the output stage from the speaker wire which can act like an antenna or parasitic capacitance.Fwiw, if i am not mistaken, the big guy is a hifi buff who happens to also be a rep for a VERY highly respected (as in world wide) line of acoustic and vibration measurement equipment.
Edits: 03/13/12
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Follow Ups
- RE: Did you know that... - tomservo 09:39:38 03/13/12 (6)
- By non-linear do you mean that compression and rarifaction are not exact mirrors of one another? nt - viridian 13:27:52 03/13/12 (5)
- RE: By non-linear do you mean that compression and rarifaction are not exact mirrors of one another? nt - Inmate51 14:18:14 03/13/12 (0)
- RE: By non-linear do you mean that compression and rarifaction are not exact mirrors of one another? nt - tomservo 13:44:09 03/13/12 (3)
- RE: By non-linear do you mean that compression and rarifaction are not exact mirrors of one another? nt - Inmate51 14:26:58 03/13/12 (2)
- RE: By non-linear do you mean that compression and rarifaction are not exact mirrors of one another? nt - tomservo 14:59:12 03/13/12 (1)
- RE: By non-linear do you mean that compression and rarifaction are not exact mirrors of one another? nt - Inmate51 07:59:44 03/14/12 (0)