Apply a two-pole all-pass filter with central frequency (in Hz) frequency, and filter-width width. An all-pass filter changes the audio’s frequency to phase relationship without changing its frequency to amplitude relationship.
The filter accepts the following options:
- frequency, f
-
Set frequency in Hz.
- width_type, t
-
Set method to specify band-width of filter.
- h
-
Hz
- q
-
Q-Factor
- o
-
octave
- s
-
slope
- k
-
kHz
- width, w
-
Specify the band-width of a filter in width_type units.
- mix, m
-
How much to use filtered signal in output. Default is 1. Range is between 0 and 1.
- channels, c
-
Specify which channels to filter, by default all available are filtered.
- normalize, n
-
Normalize biquad coefficients, by default is disabled. Enabling it will normalize magnitude response at DC to 0dB.
- order, o
-
Set the filter order, can be 1 or 2. Default is 2.
Commands
This filter supports the following commands:
- frequency, f
-
Change allpass frequency. Syntax for the command is : "frequency"
- width_type, t
-
Change allpass width_type. Syntax for the command is : "width_type"
- width, w
-
Change allpass width. Syntax for the command is : "width"
- mix, m
-
Change allpass mix. Syntax for the command is : "mix"