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ID Date Author Type Category Subject Text   5848   Wed Nov 9 14:23:35 2011 Jenne Update Adaptive Filtering OAF MC Delay Measurement As described in elog 2063 and the mevans document, we need to measure the TF of      5856   Wed Nov 9 20:35:58 2011 Mirko Update Adaptive Filtering Seismic noise injection into the MC Very elaborated measurement ;-) On 11-11-08: 18:40 Stomp near STS1 for 2mins  8x    5858   Wed Nov 9 21:32:38 2011 Mirko Update Adaptive Filtering Put accelerometers 4-6 on top of MC2 tank Put the accelerometers on top of MC2. Orientated as the arms,GUR1 and STS1:      5864   Thu Nov 10 16:44:54 2011 Mirko Update Adaptive Filtering Looking into MC_F & PSL misalignment  [Den, Mirko] While doing the things below we accidentally misaligned the PSL laser. Thanks to Suresh      5867   Thu Nov 10 22:00:38 2011 Mirko Update Adaptive Filtering Looking into MC_F & PSL misalignment                            6x    5869   Fri Nov 11 00:55:53 2011 Den Update Adaptive Filtering MC_F [Mirko, Den] Not satisfactory work of adaptive filtering make us to think about the signals      5871   Fri Nov 11 10:30:27 2011 rana Update Adaptive Filtering MC_F    There should be a whitening filter in the Pentek Generic DAQ board (Eurocard      5879   Sat Nov 12 02:00:36 2011 Mirko Update Adaptive Filtering MC-F and other signals Regarding http://nodus.ligo.caltech.edu:8080/40m/5867 and http://nodus.ligo.caltech.edu:8080/40m/5869 :      5882   Sat Nov 12 02:46:13 2011 Den Update Adaptive Filtering stacks and ground We measured the coherence between the seismometer near the MC2 stack and accelerometers on the vacuum tank where MC2 is. Because accelerometers      5900   Tue Nov 15 22:31:39 2011 Mirko Update Adaptive Filtering Towards wiener filtering and improved OAFing [Jenne, Mirko] 1. We should help the OAF by compensating  7x    5919   Wed Nov 16 23:50:40 2011 Den Update Adaptive Filtering seismic noise injection [Micro, Den] Analyzing coherence of seismic noise and mode cleaner length we've figured out      5932   Thu Nov 17 22:24:19 2011 Den Update Adaptive Filtering MC1_COIL Analyzing coherence between MC length and signals on MC1, MC2 and MC3 coils we have noticed that MC1 COIL signal is not coherent      6065   Sat Dec 3 18:29:20 2011 Den Update Adaptive Filtering coherence I've looked through the coherence between the MC length and seismometers after the if-statement problem was fixed. Coherence      6068   Mon Dec 5 02:55:30 2011 Den Update Adaptive Filtering C1OAF I've added filter banks for correction path in the C1OAF model to use AA filters.  I compiled and installed the new version.      6070   Mon Dec 5 10:13:13 2011 Jenne Update Adaptive Filtering C1OAF                                6078   Wed Dec 7 00:11:58 2011 Den Update Adaptive Filtering OfflineAF  I did offline adaptive filtering with yesterday's 3 hours of MC-F and GUR1X data. It turns out that normalized-lms can      6093   Fri Dec 9 13:28:09 2011 Den Update Adaptive Filtering C1OAF I tried to figure out why red NO SYNC label became present in the C1OAF_GDS_TP screen after I added AA filters to the C1OAF model.      6094   Fri Dec 9 14:33:16 2011 Alex Ivanov Update Adaptive Filtering C1OAF                                6100   Fri Dec 9 17:53:31 2011 Den Update Adaptive Filtering C1OAF [Jenne, Den] AA filters for witness channels are added to the oaf model. It is working now      6110   Tue Dec 13 01:20:38 2011 Den Update Adaptive Filtering Modifications to LSC, RFM models, added OAF model                                6137   Mon Dec 19 17:17:02 2011 Den Update Adaptive Filtering filter tap dependence Online filter diverges. I did offline simulations with current c-code. Offline filter also diverges, even in the simplest case       6199   Sun Jan 15 10:28:02 2012 Den Update Adaptive Filtering delays We can account for delays in the oaf system by compensating it in the adaptive path of the filter. But using only this procedure      6200   Sun Jan 15 11:40:30 2012 Den Update Adaptive Filtering downsampling Here for the downsampling process we use a low-pass Bessel digital filter of order 6, normalized cut-off frequency = 0.1. In      6201   Sun Jan 15 12:18:00 2012 Den Update Adaptive Filtering running time  In order to figure out what downsampling ratio we can take, we need to determine the running time of the fxlms_filter() function.      6296   Sat Feb 18 17:01:26 2012 Den Update Adaptive Filtering static variables In order to prevent different DOF from redetermining static variables in the adaptive code, I've created a separate code for each      6297   Sat Feb 18 18:29:38 2012 Den Update Adaptive Filtering online filtering I tried to filter MC_F from seismic noise measured by GUR1 seismometer. I've used 8000 tap filter, downsample ratio=8, delay=1.      6332   Tue Feb 28 16:12:59 2012 Den Update Adaptive Filtering lunch talk  Just to be clear what I said at the meeting, I write all this down here. Adaptive filtering of real signals (MC_F and GUR1_X)      6490   Thu Apr 5 18:24:55 2012 Den Configuration Adaptive Filtering oaf starts to work Today I tried to make the lms filter to work online. I played around with the signals (GUR1_X and MC_F) to pre-whiten them and      6491   Fri Apr 6 09:57:24 2012 Den Update Adaptive Filtering static starts to work I made static filter to work to evaluate the actuator TF.. Here is the result of static filtering:  7x    6492   Fri Apr 6 10:31:07 2012 Den Update Adaptive Filtering static and adaptive I've run static and adaptive filters simultaneously. AA32 filters rotate the phase of the witness signals GUR1X and GUR1Y and now the performance      6493   Fri Apr 6 11:14:34 2012 Jenne Update Adaptive Filtering static and adaptive                                6551   Thu Apr 19 22:18:24 2012 Den Update Adaptive Filtering oaf algorithm: old vs new  Here are the issues that I found not quite accurate in the old oaf code: 1. There is no need to calculate      6553   Fri Apr 20 23:02:25 2012 Den Update Adaptive Filtering frequency domain filter  DFT-LMS is a frequency domain adaptive filter that demonstrates faster convergence compared to the time-domain LMS filter.      6642   Fri May 11 23:33:41 2012 Den Update Adaptive Filtering offline vs online I've compared offline Wiener filtering with online static + adaptive filtering for MC_F with GUR1_XYZ and GUR2_XYZ as witness      7000   Sat Jul 21 18:04:02 2012 Den Update Adaptive Filtering frequency domain filter I've implemented online frequency domain filter and applied it to MC_F.      7234   Mon Aug 20 13:02:57 2012 Den Update Adaptive Filtering 1 Hz resonance Static filter was adjusted to filter 1 Hz resonance in MCL and it could do it. Stack is not great in this experiment due to the      7252   Wed Aug 22 20:33:51 2012 Den Update Adaptive Filtering MC_L in ARMS Jenne and I did adaptive filtering of MC_L and measured how X and Y ARM control signals change compared to non-filtered MC_L. We      7589   Mon Oct 22 20:44:49 2012 Ayaka Update Adaptive Filtering microphone noise I will do some experiments on acoustic noise canceling during my stay. Now I am planning to cancel acoustic      7592   Tue Oct 23 00:51:41 2012 Jamie Update Adaptive Filtering microphone noise                                7596   Tue Oct 23 10:24:42 2012 Ayaka Update Adaptive Filtering microphone noise                                7607   Wed Oct 24 14:15:34 2012 Ayaka Update Adaptive Filtering microphone noise Previous results I am measuring the noise level of the microphones. The circuit does not seems      7609   Wed Oct 24 15:29:52 2012 rana Update Adaptive Filtering microphone noise   We have to change the sample rate and AA filter for the mic channels before going too far with the circuit design.      7610   Wed Oct 24 17:02:01 2012 Jenne Update Adaptive Filtering microphone noise                                7614   Wed Oct 24 22:20:24 2012 Den Update Adaptive Filtering microphone noise                                7621   Thu Oct 25 09:53:23 2012 Ayaka Update Adaptive Filtering microphone noise                                7622   Thu Oct 25 10:03:38 2012 rana Update Adaptive Filtering microphone noise   That's no good - we need BLRMS channels for many PEM channels, not just two. And the channel names should have the      7623   Thu Oct 25 14:39:14 2012 Den Update Adaptive Filtering microphone noise                                7633   Fri Oct 26 18:25:02 2012 Ayaka Update Adaptive Filtering Microphone noise again [Raji, Ayaka] Thanks to Den, power supplies for microphone circuit are changed.      7634   Fri Oct 26 19:06:14 2012 Den Update Adaptive Filtering Microphone noise again                                7636   Mon Oct 29 08:41:22 2012 Ayaka Update Adaptive Filtering Microphone noise again

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