CLIOwin 7 PCI User's Manual - Audiomatica

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15.3 ACOUSTICAL PARAMETERS SETTINGS Frequency Bands Selects either Octave or Third of Octave calculations. The following figure shows the same data analyzed before in octave bands now presented with 1/3 of octave processing. Noise Correction Applies noise correction to the tail of the impulse response as suggested by ISO 3382. The figure below shows the increase in the linear portion of the calculated decay which is obtainable. RT User It is possible to input the upper and lower level, in dB, used for RTUser calculations. 180 Chapter 15 - Acoustical Parameters
15.4 THE CALCULATED ACOUSTICAL PARAMETERS The acoustical parameters are calculated from a measured decay curve. A decay curve is defined as the decay of sound pressure level as a function of time after the sound source has ceased. The decay curves are calculated from the measured impulse response after octave filtering has been applied; also wideband (linear or A-weighted) decay curves are available. Historically the most important acoustical parameter is the Reverberation Time (T or RT) defined as the time, in seconds, that would be required for the sound pressure to decrease by 60dB after the sound source has ceased; this is why the most used indication you find in literature for the reverberation time is RT60. As it is normally practically difficult to obtain a sufficient dynamic range to measure the reverberation time directly, the norm provides for its evaluation based on a smaller decay of 30dB; in this case the reverberation time, indicated as RT30, should be the time evaluated considering a linear decay given by the least-square regression of the measured curve from -5dB to -35dB. Also provided is the possibility of evaluating RT20 and RTUser (based on user defined limits). Sound level parameters. Signal [dBSPL]. Measured signal level in dBSPL in the band of interest. Noise [dBSPL]. Measured background noise level in dBSPL in the band of interest. Balance between early and late arriving energy. C50 [dB]. 50ms early-to-late arriving sound energy ratio (i.e. ratio between the energy arrived in the first 50 milliseconds to the energy arrived after). C50 is usually evaluated when results relate to speech reproduction. C80 [dB]. Usually named “Clarity”. 80ms early-to-late arriving sound energy ratio. C80 is usually evaluated when results relate to music reproduction. D50 [%]. Usually named “Definition”. Directly relates to C50 with the following equation: D50 C 50 = 10log( ) dB 1− D TS [ms]. Time of centre gravity of the squared impulse response. It is another measure of acoustic clarity; the higher Ts the poorer is clarity. Decay time measurements. EDT [s]. Early Decay Time i.e. time required to sound to decrease of 10dB from the initial maximum level. EDT is directly related to the perceived reverberance while reverberation time relates to the physical properties of the room. RT20 [s]. Reverberation time evaluated from a 20 dB dynamic range (-5dB,-25dB). See also below the correlation coefficient R associated with RT20. RT30 [s]. Reverberation time evaluated from a 30 dB dynamic range (-5dB,-35dB). See also below the correlation coefficient R associated with RT30. 50 Chapter 15 - Acoustical Parameters 181
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ELECTRICAL & ACOUSTICAL TESTS User'
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CONTENTS 1 INTRODUCTION ...........
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7.10 SIGNAL FILES .................
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14.1 INTRODUCTION .................
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AUDIOMATICA’S WARRANTY Audiomatic
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12 Chapter 1 - Introduction
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2.1 THE PB-4281 PC BOARD AND SC-01
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2.2.3 THE MIC-01 (OR MIC-02) FREQUE
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2.4 THE QCBOX MODEL 4 AMPLIFIER & S
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2) 2 x Stereo mini jack to two RCA
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3.3 HARDWARE REGISTRATION WITH WIND
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3.3.2 HARDWARE REGISTRATION UNDER W
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3.3.3 HARDWARE REGISTRATION UNDER W
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Figure 3.21 Let's now verify that t
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3.4 SOFTWARE INSTALLATION This para
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3.6 RUNNING CLIOWIN FOR THE FIRST T
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3.7.1 CALIBRATION VALIDATION Figure
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3.9 TROUBLESHOOTING CLIO INSTALLATI
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4.3 CLIOWIN DESKTOP The CLIOwin des
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4.5 HARDWARE CONTROLS TOOLBAR 4.5.1
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4.5.4 MICROPHONE CONTROL Switches C
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4.6.2 CONTROLLING A TURNTABLE Fig.4
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4.7.2 ANALYSIS MENU The Analysis me
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Fig. 4.16 Sinusoidal Submenu Fig. 4
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4.7.3 CONTROLS MENU The Controls Me
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4.8 BASIC CONNECTIONS In order to c
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4.8.3 CONNECTING THE CLIOQC AMPLIFI
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T&S parameters data files. Wow&Flut
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Invokes the Autosave Settings dialo
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5.3.4 PRINTING Enters the Notes dia
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customize up to 6 different color s
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5.7.1 SAVING MEASUREMENT SETTINGS M
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6.3 BUTTONS AND CHECKBOXES Moves (s
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6.6 THE MLS TIME DOMAIN DISPLAY Whe
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The following figure shows a 1031.2
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7.4 MULTITONES It is possible to ge
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7.6 MLS It is possible to generate
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7.8 The following figure shows a 20
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The following figure shows the same
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For comparison with Pink noises the
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The following figure shows a msampl
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84 Chapter 7 - Signal Generator
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8.2.1 TOOLBAR BUTTONS Starts the me
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This is substantially the measureme
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With the Multi-meter running, fit t
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8.6 INTERACTION BETWEEN THE MULTI-M
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9.2.1 TOOLBAR BUTTONS, DROP DOWN LI
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9.4 FFT SETTINGS DIALOG Fig. 9.2 Th
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A better approach is to center the
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it is necessary to remove the fligh
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80.0 CLIO dBSPL 70.0 60.0 50.0 40.0
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9.10 “LIVE” TRANSFER FUNCTION A
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Another factor of maximum importanc
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The last obstacle you may find whil
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10.2.1 TOOLBAR BUTTONS Starts an ML
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Amplifier & SwitchBox Model 2,3 and
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10.4 MEASURING FREQUENCY RESPONSE I
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150.0 CLIO 180.0 150.0 CLIO 180.0 O
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speaker we are testing is a gloriou
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10.4.4 PHASE & GROUP DELAY We used
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etween true phase, as in Fig.10.22,
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10.5 OTHER TIME DOMAIN INFORMATION
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utton. Any process you execute can
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10.7 MLS Vs. LOG CHIRP As anticipat
Page 130 and 131: 10.8 RELATED MENUS The dual domain
Page 132 and 133: Display fifth harmonic distortion,
Page 134 and 135: Gating (Acquisition) Settings Gated
Page 136 and 137: 11.3 A BRIEF DESCRIPTION ON SETTING
Page 138 and 139: 11.3.3 GATING Enabling Gating allow
Page 140 and 141: 11.4 DISTORTION AND SETTINGS Sinuso
Page 142 and 143: Finally Fig.11.12 shows the distort
Page 144 and 145: 12.2 WATERFALL AND DIRECTIVITY CONT
Page 146 and 147: 12.3.2 WATERFALL OPERATION As alrea
Page 148 and 149: Figure 12.5 One powerful way to ins
Page 150 and 151: 12.5 DIRECTIVITY SPECIFIC CONTROLS
Page 152 and 153: 12.6 MEASURING AND REPRESENTING LOU
Page 154 and 155: 12.6.4 REPRESENTING POLAR DATA To r
Page 156 and 157: 156 Chapter 12 - Waterfall and Dire
Page 158 and 159: If you are a novice in using CLIO,
Page 160 and 161: life harder even if more interestin
Page 162 and 163: 13.4 I SENSE This requires Audiomat
Page 164 and 165: 0.0 CLIO 180.0 dBV Deg -10.0 108.0
Page 166 and 167: CLIO INPUT A INPUT B OUTPUT A OUTPU
Page 168 and 169: 13.7 THIELE & SMALL PARAMETERS 13.7
Page 170 and 171: L 1kHz L 10kHz Inductance at 1kHz I
Page 172 and 173: We can now save our complete result
Page 174 and 175: The graphs refers to a linearity me
Page 176 and 177: DIN measures Intermodulation distor
Page 178 and 179: 15.2.1 TOOLBAR BUTTONS AND DROP DOW
Page 182 and 183: RTU [s]. Reverberation time evaluat
Page 184 and 185: 184 Chapter 15 - Acoustical Paramet
Page 186 and 187: 16.2.1 TOOLBAR BUTTONS AND DROP DOW
Page 188 and 189: 16.3 Leq SETTINGS Time resolution S
Page 190 and 191: 17.3 FEATURES Figure 17.2 Aside a s
Page 192 and 193: 192 Chapter 17 - Wow & Flutter
Page 194 and 195: [20] D. Clarke, “Precision Measur
Page 196: 196 Norms
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CLIOwin 7 PCI User's Manual - Audiomatica

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