aspen.sounds.colored_noise¶

Colored noise

Functions

colored_noise([duration, color, …])

Generate colored noise.

Classes

ColoredNoise([colored_noise_duration, …])

Generate colored noise.

class aspen.sounds.colored_noise.ColoredNoise(colored_noise_duration=[1000], colored_noise_color=['white'], colored_noise_num_signals=1, samp_freq=16000)[source]¶

Bases: aspen.interfaces.abs_common_interface.AbsCommonInterface, aspen.interfaces.abs_sound_interface.AbsSoundInterface

Generate colored noise. Colored noise is generated according to the following table.

Color	Power/octave	Power density/octave	Inverse value of frequency scaling
White	+3 dB	0 dB	0
Pink	0 dB	-3 dB	1 (i.e. 1 / f)
Blue	+6 dB	+3 dB	-1 (i.e. f)
Brown	-3 dB	-6 dB	2 (i.e. 1 / f^2)
Violet	+9 dB	+6 dB	-2 (i.e. f^2)

Parameters

colored_noise_duration¶ (Sequence[float]) – The duration of colored noise in millisecond. Defaults to [1000].
colored_noise_color¶ (Sequence[str]) – The type of colored noise. The choices are white, pink, blue, brown and violet. Defaults to [“white”].
colored_noise_num_signals¶ (int) – Number of signals. If this value greater than 2, the other arguments should contain 2 types. Defaults to 1.
samp_freq¶ (int) – Sampling frequency. Defaults to 16000.

__call__()¶

Generate a specified number of signals.

Return type

List[ndarray]

Returns

Generate signals.: Output well be sequence-like object such as list, tuple and so on.

_generate_each(idx)[source]¶

Generate each signal.

Parameters: idx¶ (int) – Index of signal generation.
Return type: ndarray
Returns: Generate signal.

static add_arguments(parser)[source]¶: add arguments

classmethod load_class_kwargs(args)¶

Return the kwargs dict for class __init__ from parsed arguments

Parameters: args¶ (Namespace) – (config)argparse arguments
Return type: dict
Returns: kwargs for class __init__

aspen.sounds.colored_noise.colored_noise(duration=[1000], color=['white'], num_signals=1, samp_freq=16000)[source]¶

Generate colored noise. Colored noise is generated according to the following table.

Color	Power/octave	Power density/octave	Inverse value of frequency scaling
White	+3 dB	0 dB	0
Pink	0 dB	-3 dB	1 (i.e. 1 / f)
Blue	+6 dB	+3 dB	-1 (i.e. f)
Brown	-3 dB	-6 dB	2 (i.e. 1 / f^2)
Violet	+9 dB	+6 dB	-2 (i.e. f^2)

Parameters

duration¶ (Sequence[float]) – The duration of colored noise in millisecond. Defaults to [1000].
color¶ (Sequence[str]) – The type of colored noise. The choices are white, pink, blue, brown and violet. Defaults to [“white”].
num_signals¶ (int) – Number of signals. If this value greater than 2, the other arguments should contain 2 types. Defaults to 1.
samp_freq¶ (int) – Sampling frequency. Defaults to 16000.

Return type

List[ndarray]

Returns

Output signals.