Graphic EQ Stages

Graphic EQ Stages allow frequency response adjustments at fixed center frequencies.

GraphicEq10b

class audio_dsp.stages.GraphicEq10b(**kwargs)

A 10 band graphic equaliser, with octave spaced center frequencies. The center frequencies are: [32, 64, 125, 250, 500, 1000, 2000, 4000, 8000, 16000]. The gain of each band can be adjusted between -12 and + 12 dB.

Note that for a 32 kHz sample rate, the 16 kHz band is not available, making a 9 band EQ. For a 16 kHz sample rate the 8k and 16 kHz bands are not available, making an 8 band EQ.

Attributes:

dsp_blockaudio_dsp.dsp.graphic_eq.graphic_eq_10_band

The DSP block class; see 10 Band Graphic Equaliser for implementation details

set_gains(gains_db)

Set the gains of the graphic eq in dB.

Parameters:

gains_dblist[float]

A list of the 10 gains of the graphic eq in dB.

set_parameters(

parameters: GraphicEq10bParameters,

)

Set the parameters of the graphic eq.

Parameters:

parametersGraphicEq10bParameters

The parameters of the graphic eq.

pydantic model audio_dsp.models.graphic_eq.GraphicEq10bParameters

Parameters for a 10-band graphic equalizer.

Attributes:

gains_db: (list[float])

Gain values (in dB) for each of the 10 frequency bands. - Each value must be between -24 dB and +24 dB. - The list must have exactly 10 elements.

field gains_db: Annotated[list[Annotated[float, FieldInfo(annotation=NoneType, required=True, description='Gain of the band in dB.', metadata=[Ge(ge=-24), Le(le=24)])]], Len(min_length=10, max_length=None)] [Optional]

Constraints:

• min_length = 10

GraphicEq10b Control

The following runtime command ids are available for the GraphicEq10b Stage. For details on reading and writing these commands, see the Run-Time Control User Guide.

Control parameter	Payload length
CMD_GRAPHIC_EQ10B_GAINS	sizeof(int32_t)*[10]
The graphic EQ gains in Q31 format. To convert a value in decibels to this format, the function geq_db_to_gain() in control/helpers.h.