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Entry  Wed Oct 24 14:15:34 2012, Ayaka, Update, Adaptive Filtering, microphone noise mic_open.pngmic_noise.png
    Reply  Wed Oct 24 15:29:52 2012, rana, Update, Adaptive Filtering, microphone noise 
       Reply  Wed Oct 24 17:02:01 2012, Jenne, Update, Adaptive Filtering, microphone noise 
       Reply  Wed Oct 24 22:20:24 2012, Den, Update, Adaptive Filtering, microphone noise mic_64k.pdf
          Reply  Thu Oct 25 09:53:23 2012, Ayaka, Update, Adaptive Filtering, microphone noise 
          Reply  Thu Oct 25 10:03:38 2012, rana, Update, Adaptive Filtering, microphone noise 
             Reply  Thu Oct 25 14:39:14 2012, Den, Update, Adaptive Filtering, microphone noise 
Message ID: 7622     Entry time: Thu Oct 25 10:03:38 2012     In reply to: 7614     Reply to this: 7623
Author: rana 
Type: Update 
Category: Adaptive Filtering 
Subject: microphone noise 

  That's no good - we need BLRMS channels for many PEM channels, not just two. And the channel names should have the same name as they had in the past so that we can look at long term BLRMS trends.

I suggest:

  1. Have a separate model for Mics and Magnetometers. This model should run at 32 kHz and not have low frequency poles and zeros. Still would have acoustic frequency BLRMS.
  2. Have a low frequency (f_sample = 2 kHz) model for seis an acc. Seismometers run out of poop by 100 Hz, but we want to have the ACC signal up to 800 Hz since we do have optical mount resonances up to there.
  3. Never remove or rename the BLRMS channels - this makes it too hard to keep long term trends.
  4. Do a simple noise analysis to make sure we are matching the noise of the preamps to the noise / range of the ADCs.
  5. Immediately stop using bench supplies for the power. Use ONLY fused, power lines from the 1U rack supplies.
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