The first serious run using the “system” was to profile the individual open strings (one at a time) allowing about 12 to 16 seconds for the signals to die out. The data (waveforms) were placed on one track, and a verbal description of activities placed on another using one of the R24’s built in microphones.
This was followed by the “strum” of the open strings…excited at fret 28 and allowed about 16 seconds to decay.
Next was the “scrub” which is continually strumming all strings at all frets above the bar, and moving the bar to all frets…no decay time needed in this case.
Then there was the response signal from the pickup for exciting the PSG by hitting various locations with the bar. The locations were front apron center, end plate center, right rear leg center, and rear apron center. No decay time needed here.
These signals were recorded on the R24 without any effects. At the same time they were fed to the computer running the FSA program so that their changing spectrum could be observed. These same signals may be replayed for subsequent processing including harmonic content vs time after excitation. These processed presentations may then be captured as “frames” and converted to jpeg or other formats, and stored (as in Photobucket, and made available to whoever is interested. This allows comparing PSG and pickup combinations from a “library” of data. The dynamics are lost by reducing the presentation to “frames”.
The audio signals may made available in the WAV and other common formats so that those interested can hear, and if they have the FSA software see the harmonic dance that takes place in the data along with the sound.
The “system” components are:
The ZOOM R24 for recording the data.http://www.samsontech.com/products/prod ... rodID=2054
A computer for processing and viewing.
The TRU RTA FSA and oscilloscope software to view and capture and process the signals.http://www.trueaudio.com/rta_abt1.htm
The SNAGIT software to reduce the FSA presentation to jpeg or other format “frames”.http://www.techsmith.com/snagit/
PHOTOBUCKET to store the “frames”.http://photobucket.com/
Add SONAR X1 for more sophisticated processing.http://www.cakewalk.com/products/sonar/
Add a VIDCAM to record the activity.
Four runs were made this AM =:
Using one pickup = Danny Shields #1,
Three 14 string PSGs = the BEAST, a PST 13 series, and a Sierra Bill Stafford setup.
The BEAST had the DS#1 used in both the neck and bridge slots.
In all cases the DS#1 was set at the tap giving 16K ohms.
Getting the data takes about 15 minutes per PSG. Post processing is another issue…it depends what info is desired.
This same system can be used to compare bars, sustain vs. bar type and string location, string noise as a function of bar type, string harmonics and sustain vs. age/use etc., and even the spectrum of use by player, both before and after the amp and effects, and then the Sound Power Level at different parts of the room