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

More documents

Recommendations

Info

$MAT Math Processing Software S10 - Klippel GmbH$

Abstract Loudspeaker defects caused by manufacturing, aging, overload or climate impact generate special kind of irregular distortion commonly known as rub & buzz which are highly audible and intolerable for the human ear. Contrary to regular loudspeaker distortions defined in the design process the irregular distortions are hardly predictable and are generated by an independent process triggered by the input signal. Traditional distortion measurements such as THD fail in the reliable detection of those defects. The Tutorial discusses the most important defect classes, new measurement techniques, audibility and the impact on perceived sound quality. Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 2
Problems addressed here: • What is Rub & Buzz ? • What kinds of symptoms are generated by irregular loudspeaker defects ? • Why do straightforward measurements fail in detecting those defects ? • Do we need a measurement more sensitive than the human ear ? • How to cope with ambient production noise ? • How to find the root cause and how to fix the problem ? Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 3
Page 1: Rub & Buzz and Other Irregular Loud
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 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
show all

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

Create successful ePaper yourself

Delete template?

Save as template?