Numerous updates have been made to the repositories at https://www.github.com/kreivalabs. Rather than continually update the printed code in the previous posts, please head over to the git repositories (and follow the page, if you like) to be notified of updates. Previous code posts will make their way over to the Projects page.
Tag: Python
Speaker coverage measurements with Python
NOTE: visit https://www.github.com/kreivalabs for current code versions. Calculate the coverage pattern area of a point-source loudspeaker based on its dispersion angle and the measured distance from source to listener (or some other point). This method uses Future functionality from www.python-future.org:
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#!/usr/bin/env python # version 1.1 02-November-2017 # Requires Future additions (http://www.python-future.org) # Calculate speaker coverage based on driver dispersion angle and measured distance from source. # Import Future functions from __future__ import absolute_import, division, print_function, unicode_literals from builtins import input import math title="Loudspeaker Coverage Calculator" print(title) print("=" * 80) # Prompt for user input cone_degrees = int(input("Enter speaker dispersion angle in degrees: ")) measured_distance = float(input("Enter measured distance from speaker in feet: ")) # Convert angles to radians angle_radians = math.radians(cone_degrees) radians_div = angle_radians / 2 # Calculate coverage pattern coverage_pattern = ((math.tan(radians_div)) * measured_distance)* 2 # Round results to two decimal places coverage_pattern_round = str(round(coverage_pattern, 2)) # Return results, prompt for user input to quit print("Approximate speaker coverage pattern is: ", coverage_pattern_round, "ft.") # Return results, prompt for user input to quit. print("=" * 80) print("Speaker coverage pattern is: ", coverage_pattern_round, "ft.") >>>>>>> Stashed changes print() print("Press the <Enter> key to exit.") input() |
Convert Samples to Time with Python
NOTE: visit https://www.github.com/kreivalabs for up to date code versions. The following will calculate elapsed time in milliseconds and seconds for a given sample rate and time (entered in seconds). It will also calculate the number of individual samples elapsed based on sample rate and time (seconds). This Python script utilizes the Future functions available for … Continue reading Convert Samples to Time with Python
Acoustic Velocity and Loudspeaker Delay with Temperature and Python
NOTE: visit https://www.github.com/kreivalabs for the current code versions. Building on the method below, here is the same calculator in Python (hooray for cross-platform!). Save the text below as a .py file to run in the Terminal of your choice. Python 2:
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#!/usr/bin/env python # Version 1.4 / 08-November-2017 title="Acoustic Velocity and Loudspeaker Delay Calculator" print title print"=" * 80 # Prompt for user input temp_fahrenheit = float(input("Enter temperture in degrees Fahrenheit: ")) measured_distance = float(input("Enter measured distance between speakers in feet: ")) # Convert Fahrenheit to degrees Celsius temp_celsius = (temp_fahrenheit - 32) * 5/9 # Calculate acoustic velocity in meters/second meters_seconds = (temp_celsius * 0.606) + 331.3 # Convert meters/second to feet/millisecond feet_milliseconds = meters_seconds * 0.00328084 # Calculate time differential based on acoustic velocity and measured distance delay_time = measured_distance / feet_milliseconds # Round results to two decimal places - suitable for most loudspeaker processing hardware and software meters_seconds_round = str(round(meters_seconds, 4)) feet_milliseconds_round = str(round(feet_milliseconds, 4)) delay_time_round = str(round(delay_time, 4)) # Return results print"=" * 80 print"Approximate acoustic velocity is:" print meters_seconds_round, "m/s, or", feet_milliseconds_round, "ft/ms." print"" print"Approximate delay time is" , delay_time_round, "ms." print"" print"Press <Enter> to exit." raw_input() |
Python 3:
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#!/usr/bin/env python # Version 1.4 / 08-November-2017 title='Acoustic Velocity and Loudspeaker Delay Calculator' print(title) print('=' * 80) # Prompt for user input temp_fahrenheit = float(input("Enter temperture in degrees Fahrenheit: ")) measured_distance = float(input("Enter measured distance between speakers in feet: ")) # Convert Fahrenheit to degrees Celsius temp_celsius = (temp_fahrenheit - 32) * 5/9 # Calculate acoustic velocity in meters/second meters_seconds = (temp_celsius * 0.606) + 331.3 # Convert meters/second to feet/millisecond feet_milliseconds = meters_seconds * 0.00328084 # Calculate time differential based on acoustic velocity and measured distance delay_time = measured_distance / feet_milliseconds # Round results to two decimal places - suitable for most loudspeaker processing hardware and software meters_seconds_round = str(round(meters_seconds, 4)) feet_milliseconds_round = str(round(feet_milliseconds, 4)) delay_time_round = str(round(delay_time, 4)) # Return results print('=' * 80) print('Approximate acoustic velocity is:' print(meters_seconds_round, 'm/s, or', feet_milliseconds_round, 'ft/ms.') print() print('Approximate delay time is', delay_time_round, 'ms.') print() print('Press <Enter> key to exit.') input() |
And a version if you have Future installed, … Continue reading Acoustic Velocity and Loudspeaker Delay with Temperature and Python