Skip to main content
4 votes

Specs of "common" sound level scale

Many of the “mystery scale” charts that I have seen include distance from the source. For example OSHA has one and includes distance and says 0dB is the threshold at 1kHz which would also be at 20µPa. ...
Timinycricket's user avatar
3 votes
Accepted

How to interpret the analog output of an SPL meter?

Based on a suggestion by Jojek in a comment, I tested the DC output using a sinusoidal signal of stepped amplitude: The results are given for 90dB SPL, 80dB SPL and 70dB SPL as read on the meter ...
Sylvain Leroux's user avatar
2 votes

Microphone polar plot measurement frequencies

When you can see various frequencies in the polar plot, it means the measurement have been made several times with pure sinusoids at the given frequencies. Notice that to measure frequency response of ...
audionuma's user avatar
  • 2,864
2 votes
Accepted

Why not pointing the loudspeaker toward the sky during open-field frequency response measurement?

speakers don't just emit sound towards the front, they emit sound in 360 degrees despite the efforts of designers. Higher frequency drivers are more directional than lower frequency drivers. The lower ...
Mark's user avatar
  • 8,900
2 votes

How do you convert sound decibel (dB) measurements to a common loudness scale?

There is no formula you can use to make this conversion. It is unlikely your webcam would be suitable as a sound sensor due to the processing involved in detecting and multiplexing the audio into the ...
Mark's user avatar
  • 8,900
1 vote

"Frequency Response" on a speaker datasheet provides only range. What do we assume here?

The lower and higher bounds of the frequency response are typically frequencies where the response is typically -3dB or -10dB (not all data sheets use the same convention). Whether this is measuring ...
Frédéric LOYER's user avatar
1 vote

Microphone polar plot measurement frequencies

In addition to what @audionuma said, the frequencies you'd use will depend on the frequencies that you're interested/recording. If I'm mainly recording speech, and somehow need to correct for mic ...
Thejasvi's user avatar
  • 121
1 vote

How can I measure the sound intensity outside my house?

You can get cheap dB meters that will record sound levels to a file. I use this one, which costs ~€50. Because it's cheap, the software is not good (I had to change the Windows region/language ...
Hobbes's user avatar
  • 1,728

Only top scored, non community-wiki answers of a minimum length are eligible