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Altitude
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_ USER MANUAL
7.5.6 _FIR AND IIR SETTINGS
FIR stands for Finite Impulse Response. FIR filters are used to optimize amplitude and/or phase.
IIR stands for Infinite Impulse Response. IIR filters are minimum phase filters used by the automatic com-
pensation in addition to FIR for the low frequencies.
•
FIR filter length
(default is 100ms): Defines the length or number of taps of the FIR filter. The longer the FIR
filter, the higher resolution the correction.
•
Number of IIR filters
(default is 10): The number of IIR filters that will be used on every channel.
•
IIR filters minimal/maximal frequency
(default is Automatic/150Hz): IIR filters will be positioned from the
min frequency up to the max frequency. The Automatic parameter uses the minimum frequency of the speaker
bandwidth and the Low-freq auto transition bandwidth parameter to calculate the IIR filter minimal frequency.
•
Low-freq auto transition bandwidth
(default is 1 octave): Determines the bandwidth of the auto transition. The
auto transition is the frequency range that separates the Optimized frequency range from the unfiltered frequen-
cy range in the low end. The upper boundary of this auto transition bandwidth is the minimal frequency of the
bandwidth of the speaker.
•
Room smoothing method
(default is Modulus): For advanced users only.
•
Norm used for level_hp (!= align)
(default is Room): For advanced users only.
7.5.7 _LEVEL ALIGNMENT SETTINGS
•
Weighting used for levels
(default is dBA): Sets the type of weighting used by the optimizer for level align-
ment.
•
Width of level window (
default is
16
/f): This time-frequency window is used to compute the perceptual level of
every speaker. Its width can be modified to improve the automatic level alignment.
•
Maximum/minimum gain on speakers
(default is 10dB/-20dB): defines the maximum/minimum gain that
will be applied for the automatic level alignment.
•
Minimal/maximal bandwidth frequency
(default is 10Hz/Unlimited): defines the high end/ low end of the
bandwidth that is used as the starting point for level computations.
•
Bandwidth determination mode
(default is Normal): Defines the speakers automatic bandwidth determina-
tion mode from measurements.
7.5.8 _SUBWOOFER LOW-PASS FILTER SETTINGS
The Optimizer includes a subwoofer low-pass filter with the following options:
•
Cutoff frequency
(Default is “disabled”): Defines the cutoff frequency for the low-pass filter that can be applied
to the subwoofer.
•
Filter type
(Default is Butterworth): Defines the type of filter used at the cutoff frequency. The elliptic filter is
sharper than the Butterworth but shows ripples in the whole bandwidth.
•
Filter order
(Default is 4): Defines the steepness of the filter. The slope gets stiffer as you increase the filter order.
Please be aware that such changes may result in significant phase shifts
•
Rp value
(For elliptical filter) (default is 0.1 dB): Sets a maximum amplitude ripple above the cutoff frequency.
•
Rs value
(For elliptical filter) (default is 80 dB): Defines the attenuation below the cutoff frequency.
7.5.9 _DECIMATION SETTINGS & ADVANCED FIR SETTINGS
!
IMPORTANT NOTE: It is strongly recommended not to change these settings unless you have been requested to do so by
your Trinnov Distributor.
7.5.10 _ADVANCED FIR SETTINGS
!
IMPORTANT NOTE: It is strongly recommended not to change these settings unless you have been requested to do so by
your Trinnov Distributor.
Summary of Contents for ALTITUDE 16
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