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Comments on ‘Sony touts 'world’s first' digital noise cancellation cans’Monday 7th April 2008 11:44 GMT not exactly hard to do, mind youJames • Tuesday 8th April 2008 11:13 GMT
to cancel out noises, one channel needs to have the waveform inverted. so, left or right channel would be inverted. This would cancel out everything. so, you have a mic on one side with a dsp that inverts the sound waves and throwing that into one ear. Then the headphones play whatever you want them to. pretty low tech actually in theory yes...Anonymous Coward • Friday 11th April 2008 20:52 GMT
But reality is never that simple - the DSP chip needs to get the delay right (hence the 4 modes I suspect) and not introduce any noise of it's own while still catering for a wide dynamic range. 99% is hard to believe - although one expects the 'tag' to come down a notch some something that is such an old idea? The period for commenting on this story has finished |
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