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Modulation Noise
- Noise which is present only in company with a signal. In analog recorders the recording process has a certain "granularity" due to the fact that the magnetic characteristics of the tape are not completely uniform which causes an irregularity in the recorded signal that sounds like noise. In digital audio systems there is also an "uncertainty" in the level of the signal because of quantization (see WFTD archive Quantization Error) in the A/D converter (see WFTD A/D converter). This uncertainty sounds like added noise and is not present if the signal is not present.
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