![](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/plugins\/documentor\/skins\/mint\/images\/search.png\")
\n\t\t\t\t<\/span>- Overview <\/a><\/div><\/li>
- Filter and order acquired measurements<\/a>
<\/div><\/li>- Run Viewer<\/a><\/span>
<\/div>- Viewer Options<\/a><\/div><\/li>
- Export in Readable Format<\/a>
<\/div><\/li>- Average Of IR<\/a>
<\/div><\/li>- Add Target Curve<\/a>
<\/div><\/li><\/ol><\/li>- Export Session<\/a>
<\/div><\/li>- Export\/Import Raw Measurement Data<\/a>
<\/div><\/li>- Free up disk space consumed by Measurement Session data by moving to other location<\/a>
<\/div><\/li><\/ol><\/div><\/div>1.<\/span>Overview <\/span> <\/span><\/span>
<\/div>\u2191 Back to Top<\/a><\/h2>The measurement functionality has been removed from the Legacy Measurement Module<\/em> with S-release. Since then, this module is used for measurement data management and viewer purposes and is called Legacy Viewer<\/em>. The currently active parts are described in this documentation.<\/p>\n
The Legacy Viewer user interface is started by selecting the Legacy Viewer in the ribbon bar of the GTT main window (red circle). If the Legacy Viewer has been launched successfully its status can be checked by opening the services monitor (green circle).
\nThis will present all services used by GTT and their status.<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/path20150.png\")
<\/p>\n<\/p>\n
The Legacy Viewer will open as a new tab in the main GTT window.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/path1366-1-9.png\")
<\/p>\nAvailable measurements can be grouped and selected for being viewed. The right area allows to delete measurements (4) and view the results (5). In the middle area, if any of the sessions appear with a warning icon this indicates that session raw data is missing, it can be re-linked with (1). Sessions can be exported in readable format (json) (6), raw measurements can be imported\/exported to\/from the project (2 and 3). If one of the above buttons is disabled (greyed-out) it means that a prerequisite hasn’t been met.<\/p>\n
The next paragraphs follow the numeration in the figure above.<\/p>\n<\/div>
\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>2.<\/span>Filter and order acquired measurements<\/span> <\/span><\/span>
<\/div>\u2191 Back to Top<\/a><\/h2>The main window allows to reorder and filter the measurement in a very straightforward way:<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/OrderBy.png\")
<\/p>\nReordering, by dragging and drop the filter bar, the organization of data change accordingly.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/OrderBy2.png\")
<\/p>\nOrganized by session.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/OrderBy3.png\")
<\/p>\nOrganized by speaker group.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/OrderBy4.png\")
<\/p>\nOrganized by speaker type.<\/p>\n<\/div>
\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>3.<\/span>Run Viewer<\/span> <\/span><\/span>
<\/div>\u2191 Back to Top<\/a><\/h2>All the measurements Time response and Frequency responses can be analyzed using Run Viewer option (button 5).<\/p>\n
The viewer interface looks as follows<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/05\/18.png\")
<\/p>\nAll selected measurement sessions will be listed in a tree view structure (1) , all generated Averages will be listed in the traces tab (2) , selected microphones and average curves, impulse responses and transfer functions will be plotted in graph (3 and 4) . Impulse response and transfer function parameters can be modified (5 and 6) , magnitude and phase plotting can be enabled\/disabled(10) , selected sessions can be exported in readable format (7) , all sessions can be selected\/deselected with one click using select\/deselect buttons (8) . The plot settings for graphs can be inhibited using inhibit plotting checkbox (9)<\/p>\n<\/div>
\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>3.1.<\/span>Viewer Options<\/span> <\/span><\/span>
<\/div>\u2191 Back to Top<\/a><\/h2>Within the impulse response viewer is possible to modify some parameters to improve the presentation of the IR and the relative transfer function.\u00a0Click on the settings icon of the relative chart.<\/p>\n
For the Impulse response, it is possible to cut the IR and window it.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/window_signal.png\")
<\/p>\n- \n
- start<\/strong>, in seconds.\u00a0 The start cut of the IR<\/li>\n
- end<\/strong>, in seconds.\u00a0 The end cut of the IR<\/li>\n
- Win Left Name<\/strong>, the window applied to the left side of the cut (see image below)<\/li>\n
- Win Left in Sec<\/strong>, the length of the left side window in seconds<\/li>\n
- Win Right Name<\/strong>, the window applied to the right\u00a0 side of the cut<\/li>\n
- Win Right in Sec<\/strong>, the length of the right side window in seconds
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/MMTransferFunction.png\")
<\/li>\n- Calibration Selection type
\nFor IR three types of calibration, accordingly to hats manual<\/a>, p.39![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/hats_cal_relation.png\")
<\/span><\/p>\n- \n
- Digital Values: the compensation constant are not considered, the results and the units are in a.u. (arbitrary unit)
\nHATS equivalent Transfer Function v\/v (small v doesn’t stand for volt!).
\n<\/strong>In MM this is called arbitrary unit a.u. and it is displayed as dBFS<\/em><\/em><\/li>\n- Arbitrary OUTPUT calibration (output calibration not yet implemented in GTT) as a workaround for proper Units in Transfer Function\u00a0 (H(f)) (0dBFS \u2192 1Vpk)
\nHATS equivalent, Normalized Sound Pressure Level Pa\/V<\/strong><\/li>\n- Calibration (removed stimulus), (Hpa(f)) to have a PASCAL outcome, independent from the generator
\nHATS equivalent, Sound Pressure Level Pa<\/strong><\/li>\n<\/ol>\n<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/calibration_explanation.png\")
<\/span><\/li>\n<\/ul>\nThe Transfer function options in the Frequency domain allows displaying the IR as transfer function in the complex frequency domain (magnitude+phase). Two methods are implemented:<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/01.png\")
<\/p>\n- \n
- Method<\/strong>, now is fixed to FULL (welch is deactivated and selected automatically for recordings).<\/li>\n
- FULL<\/strong> the power spectrum, or single-sided auto-spectrum, contains the squared RMS amplitudes of the signal. The signal cut and the windows selected in the time domain (see above) is fully transformed and its Power density calculated. There are no options, the frequency array is automatically computed, based on the next power of 2 of the IR length for an FFT, the frequency bins are calculated accordingly. This method also provides the phase of the TF
\nIt is also possible to select the smoothing for spectrum and phase. Pressing apply will update the chart.<\/li>\n<\/ul>\n- \n
- Minimum bins<\/strong>, the minimum number of bins of the FFT. If the signal is larger of minimum bins an FFT zero-padded to the next power of 2 is computed.<\/li>\n
- Smoothing<\/strong> of spectrum and phase<\/li>\n
- Weighting <\/strong>is used to emphasize or suppress some aspects of a phenomenon compared to others, for measurement<\/li>\n<\/ul>\n
- \n
- Wrap phase<\/strong>: if selected, limit the phase in the range -180\/180 degree.
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/MMTransferFunction1.png\")
<\/li>\n<\/ul>\n- \n
- WELCH (DEACTIVATED FOR END USER)<\/strong>, computes an estimate of the power spectral density by dividing the data into overlapping segments, computing a modified periodogram for each segment and averaging the periodograms.
\nThis method doesn\u2019t provide the phase of the TF (a zero vector is generated instead)
\nP. Welch, \u201cThe use of the fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms\u201d, IEEE Trans. Audio Electroacoust. vol. 15, pp. 70-73, 1967.<\/em>
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/MMTransferConfig1.png\")
<\/em><\/li>\n<\/ul>\n- \n
- BINS per segment<\/strong>, number of points used to calculate the FFT of every segment in WELCH
\nSegment Overlap<\/strong>, Percent of Bins per segment to overlap between segments<\/li>\n- Segment Window<\/strong>, the window used for conditioning every segment<\/li>\n<\/ul>\n
With the viewer it is possible to inspect and analyze the recording as well<\/p>\n
- \n
- select Recorded<\/span> as signal type, length and windowing works as usual but are applied to the recording<\/li>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/10\/rec-options.png\")
<\/li>\n- Two possible spectrum processings are available for recorded signals\n
- \n
- \n
- \n
- The Usual Power Spectrum<\/li>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/power.png\")
<\/li>\n- A Constant Q transform based on librosa\u00a0<\/a>
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/rtalike.png\")
<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n- Both can change the slope of pink noise (detrend)
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/noise.png\")
<\/li>\n<\/ul>\n- \n
- WHITE FLAT (default, the power spectrum shows white noise as flat)
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/10\/PN-3dB.png\")
<\/li>\n - PINK FLAT compensates the -3dB\/oct behavior of ordinary pink noise (the same noise is detrended in the image). The power of the two spectrums is preserved.
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/10\/PN-Flat.png\")
<\/li>\n<\/ul>\n<\/p>\n
- \n
- Available Calibrations are:
\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/10\/rec_cal.png\")
<\/li>\n<\/ul>\n- \n
- Digital Values: the compensation constant are not considered, the results and the units are in a.u. (arbitrary unit)
\n<\/strong>In MM this is called arbitrary unit a.u. and it is displayed as dBFS<\/em><\/li>\n- Calibration\u00a0 Sound Pressure of the recording in Pa<\/strong><\/li>\n<\/ul>\n<\/div>
\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>3.2.<\/span>Export in Readable Format<\/span> <\/span><\/span>
<\/div>\u2191 Back to Top<\/a><\/h2>In Impulse Response Viewer window, you can export acquired measurement to a readable format with the following steps.<\/p>\n
Select nodes using checkboxes in left side tree view.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/ExportReadableFormat.png\")
<\/p>\nTo Select all or un-select all nodes, you can use Select All<\/strong> and Unselect All\u00a0<\/strong>buttons respectively.<\/p>\n
\u00a0Inhibit Plotting<\/strong> can be selected to Inhibit plotting graph, it is useful for exporting all or many nodes as on Select All if plotting is on it might take some time to plot graphs<\/p>\n
Click Export<\/strong> button as shown in above picture to open Export Data<\/strong>\u00a0modal dialog,<\/p>\n
\u00a0
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2019\/06\/MMExportData.png\")
<\/p>\nIn the above dialogue window:<\/p>\n
- \n
- You can provide prefix string and choice of Speaker channel number, which will be part of exported<\/li>\n
- Based on your provided options, exported file contains either Impulse response or Transfer Function or both with post processing parameter details and some other details like Audio Configuration, Measured Speakers details, Generator settings etc.<\/li>\n
- If you selected \u201cExport as zip\u201d option, all exported content will be zipped under single archived file else dumped out in selected destination folder.<\/li>\n
- You can select destination folder (Export Path) using \u201cBrowse\u2026\u201d button.<\/li>\n
- After providing all your options, click on \u201cExport\u201d button to complete export operation or \u201cCancel\u201d to close window.<\/li>\n
- After export, The destination folder contains separate single file for each selected node with file name in format {AssignedSpeakerChannelNumbers}__{UserPrefix}_{NameOfNode}.meas, in the above case<\/li>\n<\/ul>\n<\/div>\n\t\t\t\t\t<\/div><\/div><\/div><\/div><\/div>
3.3.<\/span>Average Of IR<\/span> <\/span><\/span>
<\/div>\u2191 Back to Top<\/a><\/h2>Different IR Measurements can be averaged\u00a0 in order to get specific single measurements and those averages can be plotted on graph along with measured sessions and compared.<\/p>\n
There are there types of Averaging<\/p>\n
- \n
- Average with time Alignment<\/li>\n
- Average with coherence<\/li>\n
- Unweighted average<\/li>\n<\/ul>\n
Right click on In Group to open context menu to Generate Average<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/05\/AverageOfIR.png\")
<\/p>\nOn click of any type of average a window will pop up to enter average curve name<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/05\/20.png\")
<\/p>\nOn click of OK , average of selected mics will be created and Time Response and Frequency Response are plotted on graph , Created average curve can be seen in Traces tab under Array Averages.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/05\/21.png\")
<\/p>\nAlready available average curves can be renames using context menu , On Rename a window pop up will open and new name can be assigned there.<\/p>\n
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/05\/22.png\")
<\/p>\n<\/div>
- Calibration\u00a0 Sound Pressure of the recording in Pa<\/strong><\/li>\n<\/ul>\n<\/div>
- Digital Values: the compensation constant are not considered, the results and the units are in a.u. (arbitrary unit)
- Available Calibrations are:
- Both can change the slope of pink noise (detrend)
- Segment Window<\/strong>, the window used for conditioning every segment<\/li>\n<\/ul>\n
- BINS per segment<\/strong>, number of points used to calculate the FFT of every segment in WELCH
- WELCH (DEACTIVATED FOR END USER)<\/strong>, computes an estimate of the power spectral density by dividing the data into overlapping segments, computing a modified periodogram for each segment and averaging the periodograms.
- Smoothing<\/strong> of spectrum and phase<\/li>\n
- FULL<\/strong> the power spectrum, or single-sided auto-spectrum, contains the squared RMS amplitudes of the signal. The signal cut and the windows selected in the time domain (see above) is fully transformed and its Power density calculated. There are no options, the frequency array is automatically computed, based on the next power of 2 of the IR length for an FFT, the frequency bins are calculated accordingly. This method also provides the phase of the TF
- Arbitrary OUTPUT calibration (output calibration not yet implemented in GTT) as a workaround for proper Units in Transfer Function\u00a0 (H(f)) (0dBFS \u2192 1Vpk)
- end<\/strong>, in seconds.\u00a0 The end cut of the IR<\/li>\n
- Export in Readable Format<\/a>
- Filter and order acquired measurements<\/a>
![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/07\/AddtargetCuveButton.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/07\/TargetCurve_Config.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/07\/TargetCurve_Design.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/07\/TargetCurve_Added.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/07\/DerivedTargetCurve.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/07\/TargetCurve_RefernceGain.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/03\/ExportSession.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/03\/Session_Export.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/03\/Capture1.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/03\/Capture3.png\")
<\/p>\n![\"\"](\"https:\/\/audioworx.transfunnel.co\/old\/wp-content\/uploads\/2020\/03\/Capture5.png\")
<\/p>\n