Sweep Measurements for Post Processing The post processing module allows flexibility in the TDS domain that was previously only available with MLS. A measurement is made by choosing the frequency range and length of the sweep. The choice of filter settings and receive delays may be left until later. This allows the possibility of looking at features that were not noticed at measurement time, with the full noise rejection capabilities of the TDS methodology. (Please note that TEF20 hardware is not supported by this module.)
Power, Flexibility, Convenience Multiple display options include: Impulse, Doublet, Intensity, ETC, Log-Squared Impulse for Time Domain. Magnitude, Phase, Heyser Spiral, Nyquist for Frequency Domain. A rough Time measurement is displayed calculated for a convolution with the sweep to give a first look at the Time Domain. Full bandwidth long sweeps may be processed in small sections for band limited responses.
Adds Features to Other Modules With SLX installed, post processing also allows harmonic tracking to be calculated. With TDS installed, RT60, %ALcons and STI/RaSTI may be calculated. The raw measurement data is stored as a WAV file for easy export to other applications.
Tests Performed
Sweep with Log or Linear rate
Sweep range and time selected at measurement time.
TDS processing using selectable filter width and receive delay
ETC process using swept filter
Convolution display for delay reference
Octave band filtering
Averaging
Post Processing Multiple Display Options
Time Domain
ETC
Impulse
Doublet
Log-Squared Impulse
RT60, STI with TDS module
Frequency Domain
Magnitude
Phase
Heyser Spiral
Nyquist
Group Delay and Harmonic Tracking with SLX module
Overlays
Allow quick comparison of filter choices
Difference Mode
Available for energy time curves, frequency and phase response measurements
Smoothing of Data
Percentage octave smoothing of frequency data (0 to 1000%)
Data File Formats
ASCII
WAV
Configuration Files
Storage and recall of global parameter settings
TEF Requirements
Works with TEF25 USB Preamp only.
Computer System Requirements
Microprocessor - Pentium Class
RAM - 32 megabytes of available memory
Monitor - VGA (1024x768 recommended minimum)
Hard disk - 80 megabytes
Interface, USB 1.0 or 2.0
Operating system - Windows 98/2000/XP (ME and NT are not supported)