ARTA User Manual - artalabs.hr

1 ARTA Program for Impulse Response Measurement and Real Time Analysis of Spectrum and Frequency Response user Manual Version Ivo Mateljan Artalabs J. Rodina 4, 21215 Ka tel Luk i , Croatia January, 2017. Copyright Ivo Mateljan, 2004 - 2017. All rights reserved. ARTA user Manual 2 Content 1 INTRODUCTION .. 5 REQUIREMENTS .. 6 Soundcards .. 6 MEASUREMENT SETUP .. 9 A FIRST TOUCH .. 12 AUDIO HARDWARE SETUP .. 14 WDM Audio Driver Setup for Windows 2000 / XP .. 15 WDM Audio Driver Setup for Windows Vista / 7 / 8 / 10.

2 17 ASIO Driver Setup .. 19 CALIBRATION .. 20 Calibration of Soundcard Output Left Channel .. 20 Calibration of Soundcard Input Channels .. 21 Calibration of the Microphone .. 21 Frequency Response Compensation .. 21 ROTATING TURNTABLE DRIVER SETUP .. 23 External .exe file driver .. 23 Internal driver for Outline turntable ET 250-3D .. 23 Testing of turntable driver .. 24 GETTING IMAGES OF GRAPHS AND WINDOWS .. 24 2 SPECTRUM ANALYZER .. 25 Souncard testing .. 25 THE SPECTRUM ESTIMATION PROCEDURE .. 29 Spectrum Averaging.

3 31 Signal Windowing .. 32 Spectrum Graph Setup .. 33 Graph Colors and Grid Style Setup .. 34 FREQUENCY RESOLUTION OF DFT AND OCTAVE-BAND ANALYZERS .. 35 RMS LEVEL .. 38 THE TIME RECORD .. 39 MONITORING SPECTRA OF WIDEBAND SIGNALS .. 41 THE PERIODIC NOISE .. 43 TESTING WITH TWO SINE SIGNAL .. 45 Intermodulation distortion definitions .. 46 THE MULTITONE TESTING .. 48 MONITORING MEASUREMENT DYNAMICS .. 49 SPECTRUM OVERLAY .. 49 SAVING GENERATOR SIGNALS IN A .WAV FILE .. 51 3 THEORY OF THE FREQUENCY RESPONSE MEASUREMENTS.

4 52 LTI INPUT/OUTPUT RELATIONSHIP .. 52 DUAL CHANNEL SYSTEM WITH CONTINUOUS NOISE EXCITATION .. 54 DUAL CHANNEL SYSTEM WITH PERIODIC NOISE EXCITATION .. 55 SINGLE CHANNEL SYSTEM FOR FREQUENCY RESPONSE ESTIMATION .. 57 4 REAL-TIME FREQUENCY RESPONSE MEASUREMENT .. 58 user INTERFACE FOR REAL-TIME MEASUREMENT OF FREQUENCY RESPONSE .. 58 DYNAMIC RANGE IN FREQUENCY RESPONSE MEASUREMENTS .. 61 FR OVERLAYS .. 63 GETTING IMPULSE RESPONSE FROM MEASURED FREQUENCY RESPONSE .. 65 SYSTEM DELAY 68 PIR FILES .. 69 PIR file format .. 69 PIR file export and import.

5 70 Export of (spatial group) of frequency responses .. 71 ARTA user Manual 3 5 IMPULSE RESPONSE MEASUREMENT AND SIGNAL RECORDING .. 72 IMPULSE RESPONSE MEASUREMENT WITH PERIODIC NOISE EXCITATION .. 72 IMPULSE RESPONSE MEASUREMENT WITH SWEPT-SINE EXCITATION .. 74 IMPULSE RESPONSE MEASUREMENT WITH MLS EXCITATION .. 76 IMPULSE RESPONSE MEASUREMENT WITH EXTERNAL EXCITATION AND TRIGGERED RECORDING .. 78 TRIGGERED SIGNAL RECORDING .. 79 Triggered signal recording with external excitation and spectrum estimation .. 79 Triggered signal recording with internal signal and trigger generation.

6 81 BASIC EDITING PROCEDURES .. 82 6 SYSTEM ANALYSIS FROM IMPULSE RESPONSE .. 84 GATED IMPULSE AND FREQUENCY RESPONSE .. 84 Gated Impulse Response .. 84 Gated Frequency Response .. 87 Minimum Phase, Group Delay and Phase Intercept Distortion .. 90 Managing Overlays .. 91 Editing Smoothed Frequency 93 Low Frequency Loudspeaker Box Diffraction Scaling .. 94 Repeated Measurement .. 95 Simultaneous Measurement of Frequency Response and Harmonic Distortions .. 95 STEP RESPONSE .. 98 IMPULSE RESPONSE ENVELOPE (ETC ENERGY TIME CURVE).

7 100 CUMULATIVE SPECTRUM .. 102 Cumulative spectral decay .. 102 Short-time Fourier transform .. 106 BURST DECAY WITH A PERIOD BASED TIME SCALE .. 107 Classical Sine-burst Testing .. 107 The Importance of the Period Based Time Scale .. 108 Wavelet Analysis for the Fast Estimation of Bursts Decay Envelopes .. 109 Procedure for Obtaining the Burst Decay Graph .. 109 Comparison of Burst Decay Graphs and CSD Graphs .. 111 Time-frequency Resolution .. 114 7 ESTIMATION OF ROOM ACOUSTICAL PARAMETERS .. 115 ISO 3382 PARAMETERS.

8 115 ACOUSTICAL ENERGY DECAY .. 122 SPATIAL ACOUSTICAL PARAMETERS .. 125 Early Lateral Energy Measures .. 125 Interaural Cross Correlation - IACC .. 125 Measurement of Spatial Parameters .. 127 Estimation of Spatial Parameters from Previously Measured Impulse Responses .. 128 8 SPEECH 129 MTF MODULATION TRANSFER 129 SPEECH TRANSMISSION INDEX .. 130 STI AND %ALCONS .. 133 9 TOOLS .. 135 DIRECTIVITY PATTERNS .. 135 Basic Definitions .. 135 Types of Directivity Patterns in ARTA .. 135 Creation of Directivity Patterns in ARTA.

9 139 Format of DPF files .. 143 Automatic recording of spatial group of impulse responses .. 144 Exporting (spatial group) of frequency responses .. 145 INTEGRATING SPL MEASUREMENTS AND DATA LOGGING .. 147 Basic Definitions of an Integrating SPL meter .. 147 Working with ARTA SPL-Meter .. 150 OCTAVE BAND SPL METER AND NOISE RATING .. 153 Noise Rating in Buildings .. 156 ARTA user Manual 4 THIRD OCTAVE BAND SPL AND LOUDNESS METER .. 160 A Zwicker Loudness Model .. 163 THIRD OCTAVE SPL AND LOUDNESS TIME RECORD .. 164 TWO-CHANNEL VOLTAGE LEVEL METER AND THIRD OCTAVE ANALYZER.

10 166 LITERATURE .. 169 APPENDIX - MENUS, TOOLBARS AND SHORTCUTS .. 172 ARTA user Manual 5 1 Introduction The ARTA is a program for impulse response measurement, real-time spectrum analysis and real-time measurement of the frequency response. It is a tool for acoustical measurements and "point to point" testing of the audio quality in communication systems. The ARTA has functions of following measurement systems: 1. Impulse response measurement system with signal generators: periodic white noise, periodic pink noise, MLS, linear and logarithmic swept-sine.