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.

image

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

Elementary Compander

image

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

Constant-Slope Devices

Characteristics are shown in Figure 83.

image

Figure 83 ...

Get Sound Engineer's Pocket Book, 2nd Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.