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EAW Smaart 6 Operation Manual Analysis Modes and Display Types
50
The Coherence Trace
The Coherence trace displays as a second trace in red in the upper portion of the fre-
quency/magnitude response plot if the Show Coherence Trace checkbox is selected in
the Frequency Response tab of the Options dialog.
The Coherence trace is normally plotted in the upper half of the Magnitude display using
the center line as zero and the top of the graph as its maximum value (100% = perfect
coherence). As the mouse tracking cursor moves across the plot area, the coherence values
for the current data point is displayed in red in the cursor readout above the plot.
Coherence Blanking
Coherence Blanking is a technique of not looking at data whose coherence is too low.
Coherence Blanking is similar to Magnitude Thresholding (see below) but works on
coherence value rather than signal strength. The Coherence Blanking parameters are in
the Frequency Response tab of the Options dialog (Figure 3-8).
Three parameters control Coherence Blanking:
Solid Above: The Coherence trace is drawn with a solid red line if the Coherence value
is above the level set here. This value defaults to 80%, which would be considered a
very reliable Coherence value for an acoustical measurement under ideal circumstances.
Invisible Below: The Coherence trace is not drawn if the Coherence value is below the
value set here. This value defaults to 10% and would only rarely require a lower value.
Transparent in between with minimum opacity: Frequency Response (Magnitude
and Phase) traces are drawn with variable transparency, based on coherence, where
higher values are more opaque and lower values are more transparent. The minimum
opacity value ensures data traces remain clearly visible all the way down to the mini-
mum acceptable coherence value (the Invisible Below threshold). The default for this
minimum opacity value is 30%. Under difficult viewing conditions, you may want to
set it higher to make low-coherence data more visible. Setting it to 100 effectively
disables coherence blanking.
Figure 3-8 Coherence Blanking parameters in Frequency Response tab of Options dialog
- USER GUIDE 1
- Table of Contents 3
- List of Figures 7
- Chapter 1: Getting Started 9
- 1.1.2 Measurement Microphone 11
- 1.1.3 Microphone Preamplifier 11
- 1.2.1 First Time Installation 12
- 1.3 Smaart 6 Signal I/O 14
- 1.4.1 The Menu Bar 17
- 1.4.2 The Plot Area 17
- 1.4.3 Cursor Readout 17
- 1.4.4 Start/Stop Buttons 17
- 1.4.6 Display Controls 18
- 1.4.8 Signal Generator 19
- 1.4.9 Internal Delay Control 20
- 1.5 How to use this Manual 21
- 2.1 Concepts 23
- 2.1.2 Fast Fourier Transform 24
- 2.1.3 Averaging 25
- 2.1.4 Sampling Rate 25
- 2.1.5 Frequency Resolution 26
- 2.1.6 Pink and White Noise 27
- 2.1.7 Data Window Functions 28
- 2.1.8 Impulse Response 29
- 2.1.9 The Transfer Function 29
- 2.1.10 Coherence 30
- 2.1.11 Signal Alignment 30
- 2.2 Glossary of Terms 31
- 2.3 Selected Bibliography 34
- 3.1 Spectrum Measurements 38
- 3.1.2 Spectrograph 40
- 3.2.3 The Magnitude Display 45
- 3.2.4 The Phase Display 46
- 3.2.5 Time Windowing 46
- 3.2.6 Averaging and Smoothing 47
- 3.2.8 Magnitude Thresholding 51
- 3.3.3 Automatic Delay Locator 55
- 3.4 SPL Measurements 56
- 3.4.2 Calibrating to SPL 57
- Figure 3-14 Legend dialog 61
- 3.6 Internal Delay 63
- 3.7 Internal Signal Generator 63
- 3.8 Weighting Curves 65
- 3.9 External Device Control 66
- 3.10 The Locked Cursor 68
- 3.11 Smaart 6 Screen Capture 69
- Chapter 4: Applications 71
- Measurement Signal 75
- Reference Signal 75
- Computer 75
- Line Out 75
- Equalizer 75
- 4.3 Measuring a Loudspeaker 77
- 4.3.1 Adjust Signal Levels 78
- Step 1: Evaluation Listening 85
- Step 4: Compare Positions 86
- Step 6: Critical listening 86
- Step 7: Stability Testing 87
- Chapter 5: Smaart 6 Commands 91
- 5.3 Options Menu 93
- 5.3.2 Frequency Response 95
- 5.3.3 IR Analysis 97
- 5.3.4 Audio I/O 98
- 5.3.5 Delay 99
- 5.3.6 Zoom 101
- 5.3.7 Instantaneous 101
- 5.4 Help Menu 102
- 5.5 Keyboard Shortcuts 103
- External Device Control 104
- Options Menu Shortcuts 104
- Chapter 6: Troubleshooting 105
- 6.3 Sound Hardware Problems 107
- 6.4 Performance Issues 108
- 6.5 Font and Display Problems 108
- EAW Smaart 6 Operation Manual 111
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