saw tv 2 years ago promising computer assisted noise cancellation projected to replace car muffler among other uses.
2006-09-29 04:26:37 · 4 answers · asked by enord 5 in Science & Mathematics ➔ Physics
In an engine, pulses are created when an exhaust valve opens and a burst of high-pressure gas suddenly enters the exhaust system. The molecules in this gas collide with the lower-pressure molecules in the pipe, causing them to stack up on each other. They in turn stack up on the molecules a little further down the pipe, leaving an area of low pressure behind. In this way, the sound wave makes its way down the pipe much faster than the actual gases do.
When these pressure pulses reach your ear, the eardrum vibrates back and forth. Your brain interprets this motion as sound. The cancellation involves a perforated tube in the muffler and a chamber around that. So that a interference is developed within the chamber to cancel the vibrations due to the pulses in the exhaust.
VR
2006-09-29 05:08:12 · answer #1 · answered by sarayu 7 · 0⤊ 0⤋
The problem of noise cancellation in the exhaust system of cars is that the frequency of the noise varies with engine speed and load. The idea of using a computer is to vary the tuning of the muffler to reduce the noise. It is a simple problem of phasing. A computer-tuned muffler should also increase gas mileage if done right.
2006-09-29 19:10:53 · answer #2 · answered by Tlocity 3 · 0⤊ 0⤋
it may artwork fairly nicely for headphones, because of the fact the sensors could be on the threshold of your ears, yet to artwork for a house you will possibly could positioned on headphones all of the time, would not you ? because of the fact each thing of the dwelling house could have diverse sounds coming at you, everybody interior the dwelling house might could have the headphones on all of the time. and then how might you confer with human beings ? you will possibly could have a radio receiver interior the headset so which you may confer with human beings on a channel that bypasses the noise-cancelling setup. otherwise take the headphones off, then you extremely might hear the noise too. it may well be virtually impossible to do away with effectual bass sounds which holiday with the aid of partitions and with the aid of the floor and immediately in spite of the indisputable fact that your physique - you may not cancel those till all partitions and flooring have been themselves audio gadget you are able to feed a cancelling sign to.
2016-10-01 12:09:23 · answer #3 · answered by fritch 4 · 0⤊ 0⤋
i think i read about some cars using the technology to quell tire noise, too.
2006-09-29 05:36:05 · answer #4 · answered by disco legend zeke 4 · 0⤊ 0⤋