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

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$MAT Math Processing Software S10 - Klippel GmbH$

Are loudspeaker defects are acceptable which are inaudible for a human ear in a production environment ? NO ! • some loudspeaker defects become worse over time (after break-in of the suspension) • some loudspeaker defects generate random symptoms (loose particles) • the production noise masks the symptoms of the defect (air leakage) • the end user may use a more critical stimulus (low frequency bass) • Significant loss of sound quality if symptoms detected by customer Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 18
Consequences of Subjective Testing at the Assembling Line • Need for trained operators more sensitive than the end user • Avoiding fatigue of the human ears (regular breaks, low SPL) • Operating the loudspeaker under similar condition as in the final application (listening distance, amplitude, load) • Sufficient time for human inspection (flexible and long cycle times) Human testing is expensive, not reliable and highly subjective ! Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 19
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: Engineering Subjective and Objectiv
Page 21 and 22: Generation of Stimulus Basic Requir
Page 23 and 24: Stimulus: Sound Pressure [dB] 120 1
Page 25 and 26: Sound Pressure [dB] 130 120 110 100
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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