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Jul 15, 2003

I’ve added another feature to my little experiment from yesterday: When you click this link, you will be able to see the realtime noise level values outside of my office, and (if you have Apple’s Quicktime multimedia software installed on your computer) you will be able to hear what you are measuring - all from the comfort of your home or office.

Now I’m not going to pretend I’m the first to do this - I think airport noise monitoring systems have been doing similar feats for years. But this a noise monitoring system that complies with ANSI Type 1 noise regulations, and can log 1/3, 1/6 and 1/12 octave bands for about $4,000 (hardware and software included, network connection extra) - that’s about the price most vendors charge for a Type 1 handheld SLM with 1/3 octave band capability. It’s an example of what we can achieve if we take advantage of commodity hardware.

FYI, the audio is streaming at a 16kHz sampling frequency do conserve bandwidth. However, I believe the system could easily handle several connections at 44.1 kHz sampling rate (CD quality) with no significant degradation - and this is on 3 year-old hardware.

Update: Really silly bug - pressing the “Reset” button will reset the LMax, LMin, LEQ, minute and second values, but not the hour value. The bug is already fixed, but I won’t have a chance to update the server software until Friday.

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