Hi,
Does anyone know of any software that can create 1/3 octave pink noise tones for speaker frequency SPL testing. I have had a good look around this site & the 'net and can find heaps of sine tone generators but not pink noise software generators. I have Cool Edit 96 that can create pink tones but I can't work out how to do 1/3 octave filtering.
Even downloads of 1/3 octave pink tones would be fine.
Regards,
Dean
Does anyone know of any software that can create 1/3 octave pink noise tones for speaker frequency SPL testing. I have had a good look around this site & the 'net and can find heaps of sine tone generators but not pink noise software generators. I have Cool Edit 96 that can create pink tones but I can't work out how to do 1/3 octave filtering.
Even downloads of 1/3 octave pink tones would be fine.
Regards,
Dean
Hi GM.
A couple of handy utilities there. I checked out the pink noise function in the generator and it looks like it uses a pre-generated pink noise wav file and you cannot select the frequency band, even when you use the menu to select the centre frequency.
Regards,
Dean
A couple of handy utilities there. I checked out the pink noise function in the generator and it looks like it uses a pre-generated pink noise wav file and you cannot select the frequency band, even when you use the menu to select the centre frequency.
Regards,
Dean
I found this while searching the 'net:
http://www.moshier.net/pink.html
Will generate a WAV file using pink noise band limited to 1/3 octave spread over 30 frequencies. Dump the PCM into cooledit and extract the various frequencies (12 seconds each) into separate WAV files and away I go.
What a difference using these files versus simple sine waves at specific frequencies. The sine waves would have the soundmeter bouncing all over the place depending on location & frequency, yet I get a much more consistent response using the 1/3 octave WAV files and can finally see the response of my speakers.
Regards,
Dean
http://www.moshier.net/pink.html
Will generate a WAV file using pink noise band limited to 1/3 octave spread over 30 frequencies. Dump the PCM into cooledit and extract the various frequencies (12 seconds each) into separate WAV files and away I go.
What a difference using these files versus simple sine waves at specific frequencies. The sine waves would have the soundmeter bouncing all over the place depending on location & frequency, yet I get a much more consistent response using the 1/3 octave WAV files and can finally see the response of my speakers.
Regards,
Dean
Greets!
Pink noise is for displaying a speaker's response, hence the generator's 20-20 kHz BW, which BTW is centered around 630 Hz (~632.45 Hz actually) and not the 1 kHz checked, so why would you want a 1/3 octave pink tone? I mean the spacing just defines the response resolution.
Anyway, if you can make them in Cool Edit, then you can calc their BW:
Fh = Fl*2^n
Fl = Fh/2^n
where:
Fh = upper frequency
fl = lower frequency, or the XO point in this case
n = octave spread
So if you want to start at 100 Hz, then 1/3 octave on either side is:
Fh = 100*2^1/3 = ~126 Hz
Fl = 100/2^1/3 = ~79.4 Hz
GM
Pink noise is for displaying a speaker's response, hence the generator's 20-20 kHz BW, which BTW is centered around 630 Hz (~632.45 Hz actually) and not the 1 kHz checked, so why would you want a 1/3 octave pink tone? I mean the spacing just defines the response resolution.
Anyway, if you can make them in Cool Edit, then you can calc their BW:
Fh = Fl*2^n
Fl = Fh/2^n
where:
Fh = upper frequency
fl = lower frequency, or the XO point in this case
n = octave spread
So if you want to start at 100 Hz, then 1/3 octave on either side is:
Fh = 100*2^1/3 = ~126 Hz
Fl = 100/2^1/3 = ~79.4 Hz
GM
Hi GM,
I have just built a pair of Jordan JXR6 HD monitor speakers and was not happy with the hollow sound. I wanted to frequency equalise the speakers (for BSC & room modes).
After using a graphic equaliser and a sound level meter with the 1/3 pink octave tones over the speaker bandwidth the in room response is much better and the sound is richer now!
Regards,
Dean
I have just built a pair of Jordan JXR6 HD monitor speakers and was not happy with the hollow sound. I wanted to frequency equalise the speakers (for BSC & room modes).
After using a graphic equaliser and a sound level meter with the 1/3 pink octave tones over the speaker bandwidth the in room response is much better and the sound is richer now!
Regards,
Dean
- Status
- Not open for further replies.