приклади
Forms of peddling would change and evolve, but street selling remained part of the urban economic, social and cultural fabric in urban America well after the wave of anti-noise regulation discussed here.
The active muffler is a speaker cabinet which is concentric to the exhaust pipe and outputs the anti-noise in a ring around the end of the exhaust.
If the anti-noise is not a perfect replica of the noise waveform or is not exactly 180 degrees out of phase, the destructive interference will weaken the noise, but not cancel it.
At an environmental symposium held at Westchester County Airport in White Plains, N.Y., on October 17, there was good news on the anti-noise front.
The churlish response of the anti-noise brigade is sadly only what we have come to expect of them.
Other
M-translate