Apply a two-pole Butterworth band-reject filter with central frequency frequency, and (3dB-point) band-width width. The filter roll off at 6dB per octave (20dB per decade).
The filter accepts the following options:
- frequency, f
-
Set the filter’s central frequency. Default is
3000. - 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.
- transform, a
-
Set transform type of IIR filter.
- di
- dii
- tdii
- latt
- precision, r
-
Set precison of filtering.
- auto
-
Pick automatic sample format depending on surround filters.
- s16
-
Always use signed 16-bit.
- s32
-
Always use signed 32-bit.
- f32
-
Always use float 32-bit.
- f64
-
Always use float 64-bit.
Commands
This filter supports the following commands:
- frequency, f
-
Change bandreject frequency. Syntax for the command is : "frequency"
- width_type, t
-
Change bandreject width_type. Syntax for the command is : "width_type"
- width, w
-
Change bandreject width. Syntax for the command is : "width"
- mix, m
-
Change bandreject mix. Syntax for the command is : "mix"