Most comfortable listening level
The most comfortable listening level
(MCLL or MCL level) is the volume
level of the player output that is most corfortable for the subject.
The output level can be fixed or the subject can set the level within
the limits set by the tester.
Fixed or subject settable listening level
The MCLL.subjectSetsLevel-parameter in the parameter
file tells can the subject set the level or is it fixed. If set to
true, the subject sets the output listening level. If
false, the output level is fixed. Here is an example:
# Subject sets MCL level
MCLL.subjectSetsLevel=true
Default or fixed listening level
The default of fixed listening level is set with the
MCLL.default-parameter. If subject can't set the
output level, the level is used as the output level. If subject can
set the level, this parameter tells the default or initial volume
level that is set as the output level when level setting procedure
starts.
An example to set fixed/default output level:
# Default output level is -25dB
MCLL.default=-25dB
MCL level limits
The available MCL level range for the subject can be limited with the
MCLL.min and MCLL.max parameters.
The limits also apply to the default/fixed output level. Here's an
example:
# set the available output level range to [-60, 0] dB
MCLL.min=-60dB
MCLL.max=0dB
Notes
Some notes about MCLL setting.
- The maximum level that can be set generally shouldn't be greater
than 1.0 (100% or 0dB), overflows may occur (depends on the
nature of the samples used).
- Some tests may change the MCLL limits or defaults set in the
test parameter file.
- In earlier version of GP there had to be a controller component
named 'mcll' in the subject UI to be able to set the listening
level. The component doesn't have to (should not) any more be
added to the controls list. Level setting works now for all
tests. The 'mcll'-controller's parameters can still be used to
customize the look of the listening level setting dialog.
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Last modified: Mon Jul 20 16:37:14 EEST 1998