17  Analogue Noise Reduction

Noise Masking

(See also Section 3 and Figure 8)

Noise masking is an essential part of good noise reduction systems. Figure 81 illustrates sine-wave masking at 65 dBA SPL.


Figure 81  Sine-wave masking at 65 dBA SPL (courtesy of Ehmer (1959))

Elementary Compander


Figure 82 (a)  Elementary compander, (b–d) the dynamic response of its compressor

Constant-Slope Devices

Characteristics are shown in Figure 83.


Figure 83 ...

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