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

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$MAT Math Processing Software S10 - Klippel GmbH$

SPL SPL 360 180 0 RMS value (MHD) fundamental fundamental Time Domain Analysis Regular Regular distortion distortion higher order harmonics FFT -1 peak-value rms-value Crest factor amplitude spectrum frequency phase spectrum time Peak value (PHD) Solution back to the time domain exploiting amplitude and phase of higher-harmonics and all non-harmonic components peak value reveals small transients (clicks) Sensitive for all loudspeaker defects most loudspeaker defects generate symptoms with high crest factor but regular loudspeaker distortions, electrical and microphone noise have lower crest factor Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 30
Single tone with varying frequency f (chirp) Sinusoidal Generator ~ Sound Pressure [dB] Peak value Contra rms-Value Amplifier Drive Unit Microphone instantaneous frequency f 130 120 110 100 90 80 70 60 peak value (PHD) rms value (MHD) Frequency Response High-pass cut-off frequency fc > 10f Tracking Filter 100 1000 Frequency [Hz] 10000 squarer integrator peak detector High-pass filtered Distortion rms value (MHD) peak value (PHD) Peak value (PHD) is a sensitive measure for most irregular defects such as „rub and buzz“, loose particles !! Klippel, Rub & Buzz and Other Irregular Loudspeaker Distortion, 31
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: Simple Approach exploiting amplitud
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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