Chapter 6. Sound Settings
53
6.11. Timestretch
Enabling
Timestretch
allows you to change the playback speed without it affecting
the pitch of the recording. After enabling this feature and rebooting, you can access
this via the
Pitch Screen
. This function is intended for speech playback and may
significantly dilute your listening experience with more complex audio. See section
(page
) for more details about how to use the feature.
6.12. Haas Surround
This setting implements the Haas effect with adjustable delay time to enhance the stereo
effect of the sound. A full range Haas effect creates the impression that sound starts from
one channel and ends in the other. Therefore, four additional functions are provided to
move the stage back to the center:
Balance
to change the left-right channel output
ratio.
A bypass band for frequencies that mostly contain vocals, using
f(x1)
, and
f(x2)
to set frequencies which are not affected. The
SIDE ONLY
setting uses mid-side
processing to determine and apply effect to the side channel only. Finally, the
Dry/Wet
Mix
setting adjusts the proportion mixed from the original (dry) and ’effected’ (wet)
signals.
6.13. Perceptual Bass Enhancement
This setting implements a group delay correction and an additional biophonic EQ to
emphasize to boost bass perception. The
precut
setting provides negative overall gain
to prevent possible audio distortion due to the EQ gain. The defult precut value is set
to -2.5 dB and can be adjust from 0 dB to -4.5 dB. Note that this effect will stack with
any other EQ applied.
6.14. Auditory Fatigue Reduction
Human hearing is more senstive to some frequency bands. This setting applies additional
equalization and bi-shelf filtering to reduce signals in these bands to minimize the chance
that temporary threshold shift (auditory fatigue) occurs.
6.15. Compressor
The
Compressor
reduces, or compresses, the dynamic range of the audio signal. This
makes the quieter and louder sections closer to the same volume level by progressively
reducing the gain of louder signals. When subsequently amplified, this has the effect of
making the quieter sections louder while keeping the louder sections from clipping. This
allows listening to the quiet sections of dynamic material in noisy environments while
preventing sudden loud sections from being overbearing.
The Rockbox manual
(version 3.14)
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