RoughDraft

Extension/FiniteEqualizer.RoughDraft.Extension.ps1

Synopsis

Finite Equalizer

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Description

Finite Impulse Response Equalizer.

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Related Links

• https://ffmpeg.org/ffmpeg-filters.html#firequalizer

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Examples

EXAMPLE 1

Edit-Media -InputPath .\a.mp3 -FiniteEqualizer -FiniteEqualizerGain @'
if(eq(chid,1), gain_interpolate(f), if(eq(chid,2), gain_interpolate(1e6+f), 0))
'@ -FiniteEqualizerGainentry @'
entry(1000, 0); entry(1001,-INF); entry(1e6+1000,0)
'@

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Parameters

FiniteEqualizer

Finite Impulse Response Equalizer.

Type	Required	Position	PipelineInput
[Switch]	true	named	false

FiniteEqualizerGain

Set gain curve equation (in dB).

The expression can contain variables:

f the evaluated frequency

sr sample rate

ch channel number, set to 0 when multichannels evaluation is disabled

chid channel id, see libavutil/channel_layout.h, set to the first channel id when multichannels evaluation is disabled

chs number of channels

chlayout channel_layout, see libavutil/channel_layout.h

and functions:

gain_interpolate(f) interpolate gain on frequency f based on gain_entry

cubic_interpolate(f) same as gain_interpolate, but smoother

Type	Required	Position	PipelineInput	Aliases
[String]	false	1	false	firequalizer_gain

FiniteEqualizerGainentry

Set gain entry for gain_interpolate function. The expression can contain functions:

entry(f, g) store gain entry at frequency f with value g

This option is also available as command.

Type	Required	Position	PipelineInput	Aliases
[String]	false	2	false	firequalizer_gain_entry

FiniteEqualizerDelay

Set filter delay in seconds. Higher value means more accurate.

Type	Required	Position	PipelineInput	Aliases
[Double]	false	3	false	firequalizer_delay

FiniteEqualizerAccuracy

Set filter accuracy in Hz. Lower value means more accurate.

Type	Required	Position	PipelineInput	Aliases
[Double]	false	4	false	firequalizer_accuracy

FiniteEqualizerWindowFunction

set window function

Valid Values:

• rectangular
• hann
• hamming
• blackman
• nuttall3
• mnuttall3
• nuttall
• bnuttall
• bharris
• tukey

Type	Required	Position	PipelineInput	Aliases
[String]	false	5	false	firequalizer_wfunc

FiniteEqualizerFixed

If enabled, use fixed number of audio samples. This improves speed when filtering with large delay. Default is disabled.

Type	Required	Position	PipelineInput	Aliases
[Switch]	false	named	false	firequalizer_fixed

FiniteEqualizerMultichannel

Enable multichannels evaluation on gain.

Type	Required	Position	PipelineInput	Aliases
[Switch]	false	named	false	firequalizer_multi

FiniteEqualizerZeroPhase

Enable zero phase mode by subtracting timestamp to compensate delay.

Type	Required	Position	PipelineInput	Aliases
[Switch]	false	named	false	firequalizer_zero_phase

FiniteEqualizerScale

set gain scale

Valid Values:

• linlin
• linlog
• loglin
• loglog

Type	Required	Position	PipelineInput	Aliases
[String]	false	6	false	firequalizer_scale

FiniteEqualizerDumpfile

set dump file

Type	Required	Position	PipelineInput	Aliases
[String]	false	7	false	firequalizer_dumpfile

FiniteEqualizerDumpscale

set dump scale

Type	Required	Position	PipelineInput	Aliases
[Switch]	false	named	false	firequalizer_dumpscale

FiniteEqualizerFft2

Enable 2-channel convolution using complex FFT.

Type	Required	Position	PipelineInput	Aliases
[Switch]	false	named	false	firequalizer_fft2

FiniteEqualizerMinphase

Enable minimum phase impulse response.

Type	Required	Position	PipelineInput	Aliases
[Switch]	false	named	false	firequalizer_min_phase

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Syntax

Extension/FiniteEqualizer.RoughDraft.Extension.ps1 -FiniteEqualizer [[-FiniteEqualizerGain] <String>] [[-FiniteEqualizerGainentry] <String>] [[-FiniteEqualizerDelay] <Double>] [[-FiniteEqualizerAccuracy] <Double>] [[-FiniteEqualizerWindowFunction] <String>] [-FiniteEqualizerFixed] [-FiniteEqualizerMultichannel] [-FiniteEqualizerZeroPhase] [[-FiniteEqualizerScale] <String>] [[-FiniteEqualizerDumpfile] <String>] [-FiniteEqualizerDumpscale] [-FiniteEqualizerFft2] [-FiniteEqualizerMinphase] [<CommonParameters>]

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