Junger Audio d02 - Digital Dynamics Processor - Manual (Page 30)

5. APPLICATION NOTES
A specific redithering is noise shaping, with that the noise modulation of
the LSB is considering the psycho-acoustic sensitiveness of the human
ear. With it can be enlarged the audible dynamic range of a reformatted
16 bit recording ideally by about 3 bits i.e. to more than 110 dB. To
make this quality audible, the CD must of course be played back with
appropriate monitoring equipment (D/A converter, amplifier) for 20 bit
quality.
noise shaping
Disadvantages of
noise shaping/
redithering
The disadvantage of redithering - noise shaping consists in the
restrictions during postproduction. In order to receive the achieved effect
every processing must occur with coefficients which correspond to the
word length of the initial data. At signals processed with noise shaping,
these coefficients would have to be besides filtered in the same manner
like the dither signal. If one can not adhere to these conditions, one
must live with the loss of the effect, in some cases it occurs data losses.
Multiple application of these procedures can even make drop-in and
noises, such as twittering or clicks. Therefore, noise shaping or
redithering should be used only at the end of the process chain, i.e.
during the preparation of the copy master for reproduction.
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