Change Log for LTPDA Toolbox V0.4.1
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M Hewitson 30-07-07


Version 0.4.1* of the toolbox sees mainly work on the infrastructure. Some additional signal processing
commands have been added that work on a log-frequency axis a-la-lpsd. These are alpha versions at the moment. 

There is a new class in V0.4 to store time-stamps. The aim is to allow for times to be input and displayed in
a particular format and/or time-zone and to provide a centralised container to allow formats to be changed. All 
times (object creation times, t0 of tsdata, etc) will be stored as a time object.

We have added an alpha version of a noise-generator based on Franklin's algorithm. This function takes in a 
transfer-function in the form of a pole/zero model (pzmodel) and produces a time-series AO whose 
spectral-density is as described in the pzmodel. Currently there are some restrictions due to numerical 
accuracy problems, especially if the transfer-function has poles that are widely separated in frequency.


Signal Processing
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All frequency-domain signal processing functions are now multivariate, where appropriate. 

New (alpha version) functions:
	
	ltpda_ltfe     - multivariate weighted transfer function estimation on a log frequency axis.
	ltpda_lcpsd    - multivariate cross-spectral density estimation on a log frequency axis.
	ltpda_lcohere  - multivariate coherence estimation on a log frequency axis.


* We skipped V0.4 just because a bug was discovered just after tagging this version in CVS.