timerir module

freqrir.timerir.high_pass_filter(pressures, points, sample_frequency)

High-pass digital filter to wierd behaviour at low frequencies (i.e. 100 Hz).

Parameters

• pressures (list[complex]) – Pressure wave in the time domain.

• points (int) – The number of points.

• sample_frequency (float) – Sampling frequency or sampling rate (Hz).

Returns

Pressure wave with frequencies below cutoff removed.

Return type

pressures (list[complex])

freqrir.timerir.time_rir(receivers, source, room_dimensions, betas, points, sample_frequency, order=- 1, c=304.8)

Calculate room impulse response in the time domain.

Parameters

• receivers (list[list[float]] with shape (N,3)) – Reciever location(s) in sample periods (s).

• source (list[float] with shape(3,)) – Source location in sample periods (s).

• room_dimensions (list[float] with shape (3,)) – Room dimensions in sample periods (s).

• betas (float np-array with shape (3,2)) – Absorbtion coefficients. Walls: left, right, front, back, floor, ceiling.

• points (int) – Number of points, which determines precisions of bins.

• sample_frequency (float) – Sampling frequency or sampling rate (Hz).

• c (float, optional) – Speed of sound (m/s). Defaults to 304.8 m/s (i.e. 1 ft/ms) (Allen 1979).

Returns

A pressure wave in the time domain.

Return type

pressures (list[complex])

Raises

ValueError – If source and receiver are too close together (i.e. within 0.5 sampling periods).

freqrir.timerir.time_rir_slow(receiver, source, room_dimensions, betas, points, sample_frequency, c=304.8)

Calculate room impulse response in the time domain.

Parameters

• receiver (list[float] with shape (3,)) – Reciever location in sample periods (s).

• source (list[float] with shape(3,)) – Source location in sample periods (s).

• room_dimensions (list[float] with shape (3,)) – Room dimensions in sample periods (s).

• betas (float np-array with shape (3,2)) – Absorbtion coefficients. Walls: left, right, front, back, floor, ceiling.

• points (int) – Number of points, which determines precisions of bins.

• sample_frequency (float) – Sampling frequency or sampling rate (Hz).

• c (float, optional) – Speed of sound (m/s). Defaults to 304.8 m/s (i.e. 1 ft/ms) (Allen 1979).

Returns

A pressure wave in the time domain.

Return type

pressures (list[complex])

Raises

ValueError – If source and receiver are too close together (i.e. within 0.5 sampling periods).