Bjorn Roche

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bio website bjornroche.com
location New York, United States
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visits member for 6 months
seen May 1 at 20:45
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I write audio and video software. I like to work in Java, C and C++, but whatever works. Someday maybe we'll just do everything in javascript.

Currently I'm working on Xonami: www.xonami.com

I can be reached at bjornroche.com


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May
1
 comment Is there a naturally occuring sound pressure level reference?
I'm afraid that's beyond me :(
May
1
 answered Is there a naturally occuring sound pressure level reference?
Apr
21
 comment How to determine frequency components present in distorted signal, with the set of possible components already known?
You need the signals and the harmonics to be far enough apart that they don't have overlapping FFT bins. Choosing prime numbers won't guarantee that.
Apr
21
 comment How to determine frequency components present in distorted signal, with the set of possible components already known?
In the digital domain, DTMF is usually decoded using the Goertzel algorithm. Like the FFT, the Goertzel algorithm is essentially a DFT implementation designed for performance.
Apr
21
 answered How to determine frequency components present in distorted signal, with the set of possible components already known?
Apr
20
 awarded  Teacher
Mar
12
 comment Calculating the mass equivalency of a song?
FWIW, people ask about measuring dB SPL on the iPhone. You would need to calibrate your iPhone first. Use a sound level meter instead. 50 bucks from radio shack.
Mar
5
 answered What creates the differences between the two channels of a stereophonic signal?
Nov
19
 comment Frequency of the sound when blowing in a bottle
en.wikipedia.org/wiki/Helmholtz_resonance
Nov
16
 awarded  Supporter