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Consumer Electronics by S. P. Bali

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NOISE REDUCTION

If we record on wider sections of tape, we find that the signal-to-noise ratio is much better. For example, when a cassette is recorded mono on the same equipment is much better as compared to record stereo cassettes. The difference is caused by the random nature of the noise. If we compare two strips of tape, one recorded to double the width of the other, we would expect that because twice as many particles are magnetised by the signal in the wider strip, the replay signal would have twice the amplitude from the wider strip as from the narrow strip. But the noise from the wider strip is not twice as great, but nearer to 1.4 times as great (where 1.4 is approximately equal to ). This arises because noise is not a signal of definite ...

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