Rub & Buzz and Other Irregular Loudspeaker ... - Klippel GmbH

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$MAT Math Processing Software S10 - Klippel GmbH$

Voice Coil Rubbing Measurement of Incoherence with a music stimulus Percent 100 10 1 Defect speaker Good speaker KLIPPEL 10 2 10 3 10 4 Frequency [Hz] Distortion from regular nonlinearities mask symptoms from rub and buzz Incoherence measurement is not sensitive for impulsive distortion Klippel, Sound Quality of Audio Systems, Diagnostics on Irregular Loudspeaker Defects, 24
Sound Pressure [dB] 130 120 110 100 90 80 70 60 Sound Pressure [dB] Sound Pressure [dB] 130 120 110 100 90 80 70 60 50 140 130 120 110 100 90 80 70 60 Frequency Response 2 10 THD Max Frequency Response THD Max 3 10 Frequency [Hz] THD THD Voice Coil Rubbing Stimulus: sinusoidal sweep KLIPPEL 210 310 Frequency [Hz] 410 KLIPPEL 4 10 1V 2V Frequency Response THD Max 100 1000 10000 Frequency [Hz] •THD measures the rms value of all harmonics •Regular distortion are dominant •Distortion of defects have not much energy THD is not sensitive for coil rubbing and other irregular defects !! THD KLIPPEL Klippel, Sound Quality of Audio Systems, Diagnostics on Irregular Loudspeaker Defects, 25 3V
Page 1 and 2: Rub & Buzz and Other Irregular Loud
Page 3 and 4: Problems addressed here: • What i
Page 5 and 6: Loudspeaker Defect: Buzz problem Mo
Page 7 and 8: Loudspeaker Defect: Voice Coil Rubb
Page 9 and 10: Loudspeaker Defect: Loose Particles
Page 11 and 12: Searching for a Critical Stimulus A
Page 13 and 14: Impact on Sound Quality Amplitude m
Page 15 and 16: Example 2: Automotive Audio System
Page 17 and 18: Engineering Subjective and Objectiv
Page 19 and 20: Consequences of Subjective Testing
Page 21 and 22: Generation of Stimulus Basic Requir
Page 23: Stimulus: Sound Pressure [dB] 120 1
Page 27 and 28: Symptoms of a Loudspeaker Defect lo
Page 29 and 30: Simple Approach exploiting amplitud
Page 31 and 32: Single tone with varying frequency
Page 33 and 34: Sound Pressure [dB] 130 120 110 100
Page 35 and 36: Sinusoidal Stimulus Very Small Loos
Page 37 and 38: ICHD Instantaneous crest factor of
Page 39 and 40: Characteristics for Diagnostics Sin
Page 41 and 42: Diagnostics on Irregular Defect (2
Page 43 and 44: Basic Classification of Loudspeaker
Page 45 and 46: Example: tensile slap, bottoming De
Page 47 and 48: Stimulus Solution: Active Compensat
Page 49 and 50: 110 100 90 dB 80 70 60 50 40 30 2*1
Page 51 and 52: Averaging of Air Leakage Noise Mult
Page 53 and 54: u(t) voltage Modeling by a Signal F
Page 55 and 56: Envelope of the Modulated Noise Mul
Page 57 and 58: MOD abs fundamental Absolute Modula
Page 59 and 60: Influence of Excitation Voltage Box
Page 61 and 62: How to Separate Port and Leak Noise
Page 63 and 64: Air Leak Localization of Loudspeake
Page 65 and 66: Voltage at Terminals Coping with Am
Page 67 and 68: Solution: Ambient Noise Microphone
Page 69 and 70: Sound Quality in the Car Interior a
Page 71 and 72: How to fix the problem? Klippel, Ru
Page 73 and 74: Automatic Learning from Manufacturi
Page 75 and 76:
Sound Pressure [dB] Sound Pressure
Page 77 and 78:
Irregular Loudspeaker Distortion Su
Page 79 and 80:
Many thanks ! Klippel, Rub & Buzz a
Page 81:
Application Notes and Templates App
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Rub & Buzz and Other Irregular Loudspeaker ... - Klippel GmbH

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