Skip to main content

A few audio/sound calculation utilities

Project description

A few audio/sound calculation utilities for Python.

Caution: I am not a sound engineer. This comes without any sort of guarantee. See file “LICENSE” for details.

If you find a bug, please post a remark in the issues section. Thanks!

Function overview

damping

Caclulates the damping (dissipation, absorption) in dependence of air pressure, temperature, humidity and frequency. The return value is the damping in dB/m (decibel per meter).

>>> d = audiocalc.damping(temp=20, relhum=80, freq=8000)
>>> d
0.06945538

total_level

Given sound pressure levels for octave frequencies, calculates the total sound pressure level.

>>> octave_frequencies = {
    'f63': 71.5,
    'f125': 68.5,
    'f250': 64,
    'f500': 58,
    'f1000': 53,
    'f2000': 47,
    'f4000': 40,
    'f8000': 32}
>>> audiocalc.total_level(octave_frequencies)
73.91092323

total_rated_level

Given sound pressure levels for octave frequencies, calculates the A-rated total sound pressure level.

>>> octave_frequencies = {
    'f63': 71.5,
    'f125': 68.5,
    'f250': 64,
    'f500': 58,
    'f1000': 53,
    'f2000': 47,
    'f4000': 40,
    'f8000': 32}
>>> audiocalc.total_rated_level(octave_frequencies)
60.5054659

distant_level

Given a reference sound pressure level (reference_level) in a reference_distance, this function calculates the sound pressure level at a certain distance.

The unit for sound level parameter and return value is dB, the unit for distances is meters.

Assumptions:

  • No air damping
  • The sound source is point-shaped
  • energy spreads equally to all directions
>>> l = audiocalc.distant_level(
        reference_level=100,
        distance=100,
        reference_distance=1)
>>> l
60.00000000000001

distant_total_damped_rated_level

This combines the powers of some of the functions above. It calculates the total A-rated sound pressure level, based on a reference distance and octave sound pressure levels, given a distance, temperature and relative humidity.

>>> octave_frequencies = {
    'f63': 71.5,
    'f125': 68.5,
    'f250': 64,
    'f500': 58,
    'f1000': 53,
    'f2000': 47,
    'f4000': 40,
    'f8000': 32}
>>> audiocalc.distant_total_damped_rated_level(
    octave_frequencies=octave_frequencies,
    reference_distance=300,
    distance=2000,
    temp=20, relhum=80)
40.860935587070635

level_to_power

Converts logarithmic sound pressure level (dB) values to metric power (W/sqm) values.

>>> audiocalc.level_to_power(100)
0.01

Credits

Some basic calculations have been adapted from http://www.sengpielaudio.com/

Like audiocalc?

Feel free to tip me!

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for audiocalc, version 0.0.4
Filename, size File type Python version Upload date Hashes
Filename, size audiocalc-0.0.4.tar.gz (2.8 kB) File type Source Python version None Upload date Hashes View
Filename, size audiocalc-0.0.4.zip (3.6 kB) File type Source Python version None Upload date Hashes View

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring DigiCert DigiCert EV certificate Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page