moutend / go-equalizer

The go-equalizer provides digital filters based on the RBJ audio EQ cookbook.

go-equalizer

go-equalizer provides equalizers based on the Robert Bristow-Johnson's audio EQ cookbook.

• Cookbook formulae for audio EQ biquad filter coefficients

This package supports the following digital filters:

• Low-pass
• High-pass
• All-pass
• Band-pass
• Band-reject
• Low-shelf
• High-shelf
• Peaking

Install

$ go get -u github.com/moutend/go-equalizer

Example

See the example directory.

Usage

package main

import "github.com/moutend/go-equalizer/pkg/equalizer"

func main() {
	// Audio signal
	input := []float64{ /* ... */ }
	output := make([]float64, len(input))

	// Create the band-pass filter.
	bpf := equalizer.NewBandPass(44100, 440, 0.5)

	for i := range input {
		output[i] = bpf.Apply(input)
	}
}

NOTE: go-equalizer does not provide the way to read the audio file as a float64 slice.

LICENSE

MIT

Author

Yoshiyuki Koyanagi [email protected]

go-equalizer's Issues

golang) high pass filter method question

HI.
I am new in golang.

I want open file and do HPF and save the file after HPF.

the file format is
1 28.00000
2 29.00000
3 28.00000
4 30.00000
5 28.00000
.....
.....

it has two column
(time well_height)

the sample rate is 0.0166Hz (60 seconds interval well height recording)
It has very very long term noise more than 200 sec
So I want to High pass filter with cutoff frequency 0.005 Hz

I looked over your golang code very carefully with 1 week
but Still I failed with your code.

Is there any sample form with open file and do HPF and save to file with HPF results ?

please help me. I am graduate course student.

Thanks for all.

TaeRhee