EAW Resolution Specifiche Pagina 43
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EAW Smaart 6 Operation Manual Analysis Modes and Display Types
43
Spectrum Mode FFT Parameters
The FFT parameters for Spectrum, Frequency Response, and Impulse Response are in
their respective tabs in the Options dialog.
Sample Rate – Each time Smaart 6 starts or a new input device is selected, the computer’s
sound hardware is queried to determine which sampling rates are supported. These
options appear in Sampling Rate drop-list in the Audio I/O tab of the Options dialog.
Note that the Sampling Rate set here appears at the top of the other tabs but can be set
only in the Audio I/O tab.
FFT Size – The FFT Size is set independently for Spectrum and Frequency Response
measurements in their respective tabs in the Options dialog. See Options Menu on page
93 to determine their specific options.
Time Constant – The time constant (TC), or time window of an FFT is a function of
the FFT size and sampling rate (TC = FFT size/SR). Smaart 6 automatically calculates
the time constant yielded by the FFT size and SR and displays it in the Time Constant
field in the Impulse/Locator tab of the Options dialog (it is not editable).
Frequency Resolution – A function of the FFT size and sampling rate (FR = SR/FFT
size in samples), frequency resolution is an important factor that determines the detail
obtained from FFT-based measurements, particularly at low frequencies. See Frequency
Resolution on page 26 for more information. Note that the Frequency Resolution for
Spectrum and Frequency response measurements is displayed on the Status bar along
the bottom of the main real-time window.
- 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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