How to convert o/p voltage (voltage) of microphone into pressure (Pascals)

Hi All,

I am working on an application where I need to convert the o/p voltage(in volts) of microphone into pressure (in pascals). I wanna know how I would be able to do this by using MATLAB. IS there in functionality for the same. I would be grateful, if somebody guides me in this regard.

Also how do I convert Pressure(in dBSPL) to pressure (in pascals) in matlab I appreciate the help in advance.

Regards Prianca

Answer 1

[atharva]

Hey Prianca,

I understand that you want a function to convert voltage (in volts) into pressure (in pascals).

You can make a custom function , The relationship between voltage and pressure would depend on the specifics of your system, as it's not a universal conversion. However, I can give you a template where you can plug in your own conversion formula.

function pressure = voltageToPressure(voltage)
    % Your conversion formula here
    % For example, you might have a linear relationship: pressure = m * voltage + b;
    
    % Replace the following with your actual conversion formula
    m = 0.1;  % Replace with your slope
    b = 100;  % Replace with your y-intercept
    
    pressure = m * voltage + b;
end

Remember to replace the values of m and b with the actual coefficients from your system's calibration. If you have a specific formula or data points relating voltage to pressure, you can use that to define the conversion in the function.

Similarly you can create a custom function to convert Pressure(in dBSPL) to pressure (in pascals)

function pressurePa = dBSPLtoPascals(dBSPL)
    % Reference pressure in pascals for SPL calculations (typical value is 20e-6 Pa)
    P_reference = 20e-6;

    % Convert dBSPL to pressure in pascals
    pressurePa = 20 * 10^(dBSPL / 20) * P_reference;
end

In this function, dBSPL is the input in decibels Sound Pressure Level, and pressurePa is the output in pascals.

I hope this helps!