carnoise_parameters_generator

Class to generate random parameters for the Car noise signal generation

These are 2 separated class to keep the logic separated

class clarity.utils.car_noise_simulator.carnoise_parameters_generator.CarNoiseParametersGenerator(primary_filter_cutoff: float = 0.14, primary_filter_constant_hz: float = 2.86, secondary_filter_cutoff: float = 0.8, secondary_filter_constant_hz: float = 200, random_flag: bool = True, random_seed: int | None = None)[source]

Bases: object

A class to generate noise parameters for a car. The constructor takes a boolean flag to indicate whether some parameters should be randomized or not.

The method gen_parameters takes a speed in kilometers per hour and returns a dictionary of noise parameters.

The global variables GEAR_LOOKUP and RPM_LOOKUP are used to determine the gear and RPM for a given speed.

Example

>>> car_noise_parameters = CarNoiseParameters(random_flag=True)
>>> parameters = car_noise_parameters.gen_parameters(speed_kph=100)
>>> parameters
{
"speed": 70,
"gear": 4,
"rpm": 1890.0,
"primary_filter": {
    "order": 1,
    "btype": "lowpass",
    "cutoff_hz": 12.685320000000003,
},
"secondary_filter": {
    "order": 2,
    "btype": "lowpass",
    "cutoff_hz": 276.22400000000005,
},
"bump": {"order": 1, "btype": "bandpass", "cutoff_hz": [34, 66.64000000000001]},
"dip_low": {"order": 1, "btype": "lowpass", "cutoff_hz": 90},
"dip_high": {"order": 1, "btype": "highpass", "cutoff_hz": 220.12494775682322},

}

GEAR_LOOKUP: Final = {50: [3], 60: [4], 75: [4, 5], 85: [5], 100: [5, 6], 110: [6]}

REFERENCE_CONSTANT_DB: Final = 30

RPM_LOOKUP: Final = {3: 0.6, 4: 0.45, 5: 0.34, 6: 0.28}

gen_parameters(speed_kph: float) → dict[source]

Generate a dictionary of noise parameters for a given speed.

Parameters:: speed_kph (float) – The speed of the car in kilometers per hour between 50 and 120 km/h.
Returns:: parameters – A dictionary of noise parameters.
Return type:: dict

set_new_randomisation_range_freq_multiplier()[source]: Set a new frequency multiplier use in the primary and secondary filters