SevenBandParametricEQ
Added in v0.24.0
Adjust the volume of different frequency bands. This transform is a 7-band parametric equalizer - a combination of one low shelf filter, five peaking filters and one high shelf filter, all with randomized gains, Q values and center frequencies.
Because this transform changes the timbre but keeps the overall "class" of the sound the same (depending on the application), it can be used for data augmentation to make ML models more robust to various frequency spectra. Many things can affect the spectrum, for example:
- the nature and quality of the sound source
- room acoustics
- any objects between the microphone and the sound source
- microphone type or model
- the distance between the sound source and the microphone
The seven bands have center frequencies picked in the following ranges (min-max):
- 42-95 Hz
- 91-204 Hz
- 196-441 Hz
- 421-948 Hz
- 909-2045 Hz
- 1957-4404 Hz
- 4216-9486 Hz
SevenBandParametricEQ API
min_gain_db:float• unit: Decibel- Default:
-12.0. Minimum number of dB to cut or boost a band max_gain_db:float• unit: Decibel- Default:
12.0. Maximum number of dB to cut or boost a band p:float• range: [0.0, 1.0]- Default:
0.5. The probability of applying this transform.