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

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$MAT Math Processing Software S10 - Klippel GmbH$

Loudspeaker Defect or Noise ? dB 130 120 110 100 90 80 70 60 50 40 Fund. mean 3rd THD 2nd PHD CHD MHD Fundamental PHD limit (-40dB) 10 20 50 100 200 500 1k 2k 5k 10k Frequency [Hz] Symptoms of a significant defect: 1. Sufficient amplitude: peak value PHD > FUND mean - 40dB 2. Impulsive: crest factor CHD > 12dB Check for coincidence ! (microphone noise is not impulsive) Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 38 is not an audibility threshold !
Characteristics for Diagnostics Single-valued parameter derived from PHD and CHD Batch of TRF measurements 6V 8V 10V 12V voltage dB dB - - [V] [V] (rms) (rms) Fundamental Fundamental + + Harmonic Harmonic distortion distortion components components (SHAPED (SHAPED STIMULUS) STIMULUS) 130 130 120 120 120 110 110 110 100 100 100 90 90 90 80 80 80 80 70 70 70 70 60 60 60 60 50 50 CHD > 12dB impulsive Signal Signal Signal at at IN1 IN1 Fundamental Fundamental Fundamental THD THD THD 2nd 2nd 2nd Harmonic Harmonic Harmonic 3rd 3rd Harmonic Harmonic Absolute Absolute Absolute PHD PHD PHD Fund. Fund. Fund. mean mean mean (100 (100 (100 to to to 500 500 500 Hz) Hz) PHD PHD limit limit (-40dB) (-40dB) f r&b -40 dB KLIPPEL KLIPPEL 50 40 50 40 10 10 20 20 50 50 100 100 200 200 500 500 500 1k 1k 2k 2k 2k 5k 5k 5k 10k 10k 10k Frequency Frequency Frequency [Hz] [Hz] [Hz] Significant defect (R&B) PHD > FUNDmean - 40dB high amplitude 12V Conditions: Rms Voltage U r&b = 12 V Peak displacement X r&b= 4mm Frequency f r&b = 65 Hz Inst. Displacement x in, r&b = 3.8 mm Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 39
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 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: ICHD Instantaneous crest factor of
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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