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Thank you, exectly what I need for my project.

Yes

Johann Pachelbel. Canon and Gigue for 3 violins and basso continuo In Hiroshima Mems Microphone ICS-40730 th-cam.com/video/hbZV7pXgv3I/w-d-xo.html Simultaneous recording Johann Pachelbel. Canon and Gigue for 3 violins and basso continuo In Hiroshima Sanken lavalier microphone COS-11PT th-cam.com/video/wfZdY483XeY/w-d-xo.html Brahms Symphony No. 2 in D major, Op. 73 Mihara Chamber Orchestra Mems Microphone ICS-40730 th-cam.com/video/WZ_k-xTd9OQ/w-d-xo.html Messiah Mems Microphone ICS-40730 th-cam.com/video/05veph008Z8/w-d-xo.html I would be happy if you subscribed to the channel and gave it a high rating.

Hi Mikko, Glad to hear that you are still working on Microphone industry. Kingly from Korea

I wanted to see some experimental setup and test results of frequency response functions. You course would be much complete if you could have used those many pieces of equipment on your desk. kk

Moi Mikko, Is it common that mems are beeing used in instrumental microphones? Such as drum microphones? Or basiclly vocal microphones for live performance use? Great content and super interesting channel!

Great video, thanks!

Hi Mikko, it's a longshot you'll read this comment, since some time has passed since the creation of this video. I enjoyed reading the guidelines from Infineon to which you (or your company) have allegedly contributed. Not all MEMS mics come with gaskets or silicone acosting isolation. I can't seem to find any off the shelf products for low quantities (<50), perhaps you know some DIY solution or some business that sells them?

Were the videos on oversampling, nyquist freq, etc. ever made? I would love to see them!

Excited to be here! I’m an engineer for a leading AV automation company in the US and we are beginning to work with MEMS mics. I was brought on as a hybrid electronic/acoustics engineer. I will watch the whole series and hope it is of great use to my studies!

Your presentation is amazing. I have watched many videos but here I understood phase delay and latency.

Hi Sir I have an question about the polarity of mems microphone. May I understood, the diaphragm close to back plate then polarity is positively, the diaphragm far way back plate then polarity is negatively, right?

Great Mikko, great to see your face again after so many years.

My only worry is that you're lacking enough speakers on your desk.

Just finished watching the entire microphone guide. Thank you so much for the very well researched video series! Must have taken an insanely long time to put it all together! I also liked the little easter eggs you added to the credits :) All the best!

man this is brilliant informaion. im looking at doing some testing work and this is all concrete information i wish i could print in a little booklet

this is actually quite a nice A - Z of classic microphone problems. its great stuff. a lot applies to speakers too. i think if i was to add one more thing on the end it might be the angular properties of the mic. so off-axis versus on axis.

Very useful. Thanks!

Total respect for the master♥ As a common mortal consumer and a musician I have a question for you: even if it's a chimera nowadays to reach the top audio quality levels of masterpieces like the "old" 808 or Lumias, can I find out there in the market a recent smartphone that implements a decent mics that are able to support hi SPLs like in a live concert/rock music festival environment without distortion issues? Are the new Android Nokia 7, 8 or 9 Pureview (with Ozo technology), or what other brand/model you could know, a valid deal to looking for buying? Thanks in advance and keep a good work!

great episode

0:00 Preface 0:53 Introduction 7:04 Brief History of MEMS Microphones 27:18 MEMS Microphone Market Landscape

Excellent ,crisp presentation looking forwards to more on clear testing procedures

Square Wave only has ODD harmonics. Unless you tried to capture non-idealities on the Square-wave frequency spectrum, I'd suggest updating the freq-response to only have ODD harmonics for a square wave.

Mikko makes complex concepts easy to understand

best overview of MEMS available.

Great explain

Great video! I am interested in manufacturing techniques to test for leaks in the microphone seals. Do you have any recommendations for seal testing in manufacturing? I've heard of techniques that involve pressing foam against the mouth of the channel while making before/after SPL measurements. Is there any merit to these "open channel/closed channel" techniques, or are there other ways to directly detect leakage? I'd prefer to avoid more indirect performance measurements that could have multiple root causes.

What mic are you using in this video?

Hi MIKKO SUVANTO, Thanks for the very insightful information. Can you please provide some reference paper for this amazing content. If the commercially available microphones used for audio recording, in general, are non-linear? So why do people model the microphone using a transfer function? Thank You

This is great! Every musician or sound tech should really watch this.

Can you decipher spoken words with out vocal sound

100th subscriber. Thanks!

0:37 Environmental tests - 1:28 Common environmental tests - 5:06 Requirements for microphone performance after test 6:46 Contamination tests 9:06 ESD tests - 9:55 Three common ESD test standards - 10:39 Component and device level tests - 12:19 ESD test variables - 12:48 Pressure shock caused by ESD 13:43 Reflow tests 14:43 Latch-up test & DC safety check 16:26 Use Case tests - 18:56 Pressure and sound sensor displacement related tests - 20:26 Temperature and humidity related tests - 22:03 Deformation related tests - 22:41 Light sensitivity tests

0:34 Reliability testing 3:24 Drop and impact tests - 4:11 Two types of drop test fixtures - 6:25 Guided drop tests vs. tumble tests 9:03 Pressure shock tests 10:31 Vibration tests

0:32 Electro-acoustic test setup 3:51 Electro-acoustic test signals - 3:53: Test signal frequencies - 4:32 Test signal sound pressure levels 6:23 Phase measurement accuracy 8:31 Electro-acoustic test system requirements - 9:32 Ambient noise reduction (ambient and structure-borne noise) - 10:46 Electrical self-noise of the test system 11:59 Noise measurement vs. test system noise 13:02 Electro-acoustic test environment 14:44 The human factor 15:32 RF testing - 17:24 Poor repeatability of RF tests - 19:01 Common RF tests

0:31 Electro-acoustic parameters to be tested - 0:49 Sensitivity - 2:19 Polarity - 3:30 Directivity - 4:39 Frequency Response - 6:25 Phase & Phase Response - 8:24 Group Delay - 8:48 Self-noise and Signal to Noise Ratio (SNR) - 12:05 Total Harmonic Distortion (THD) - 15:19 Acoustic Overload Point (AOP) - 15:52 Dynamic Range - 16:10 Current Consumption - 17:01 Power Supply Rejection (PSR / PSRR) - 18:42 RF Immunity

0:34 Reliability in production - 0:36 Poorly controlled device manufacturing processes - 1:22: Device design and assembly processes - 2:31 Mechanical threats - 3:25 Pick & place process - 4:42 Contamination - 5:02 Cleaning of the device circuit board - 5:48 Excessive temperatures - 6:30 ESD 8:16 Reflow soldering - 12:03 Moisture Sensitivity Level - MSL 13:46 Sealing ring and solder paste - 15:14 Solder paste application and amount 17:27 Reworking - 18:08 Component removal - 19:32 Mounting a new component - 20:50 Reworking other components close to MEMS microphones

0:34 Reliability improvement 2:18 Mechanical reliability 6:11 Immunity against contamination 18:00 Immunity against environmental factors 22:53 Light sensitivity

0:36 Environmental factors 5:14 Contamination 12:17 Mechanical abuse 17:19 Pressure shocks 18:53 Electrical and other risks

0:43 ESD mitigation - 2:57 ESD vs. RF and power supply disturbances - 5:10 Key ESD factors in a MEMS microphone 6:17 ESD immunity improvement in a device 7:43 MEMS microphone reliability 10:40 Reliability factors - 10:49 The microphone itself - 11:07 Manufacturing of the microphones - 12:09 Design for manufacturing - 13:27 Design of the device - 14:25 Manufacturing of the device 15:19 Microphone in a device; consequences of problems

0:41 Electro-Magnetic Compatibility - EMC - 1:48 Three forms of electro-magnetic incompatibility - 4:17 EMC issue analysis - 4:53 Ways disturbances pollute microphone signals 5:57 Conducted and radiated disturbances - 5:59 Conducted disturbances - 7:14 Radiated disturbances 9:12 Disturbance minimization - 10:35 Grounding - 13:15 Trace lengths and routing - 15:09 Shielding and Faraday Cage - 16:54 High-power / high-current systems - 17:31 Power supply disturbances - 18:12: Disturbance filtering 24:40 Microphone as a disturbance source

0:38 Digital microphone clock & timing - 2:36 Choosing operation mode with clock frequency - 3:52 Timing requirements (Clock frequency, Duty cycle, Clock rise/fall time) - 4:47 Key timing parameters (Delay times for Data Driven, Data valid and Data High-Z) - 6:24 Requirements for the timing of the microphone 8:08 IO Voltage levels - 8:46 Key digital voltage levels (Input logic high/low level, Hysteresis width, Output logic high/low level) 10:21 Digital signal path requirements - 12:13 Dynamic range / SNR / bit depth - 13:38 Signal bandwidth limitations (sampling rate) 14:27 Left / Right Selection

0:28 Electrical implementation of digital microphones 2:01 Digital microphone electrical implementation goals - 4:39 Drawbacks of digital interfaces - 6:12 Analog to digital conversion 7:29 Digital microphone PDM interface 9:57 Digital microphone electrical implementation guidelines - 13:16 Digital vs. Analog Implementation - 14:10 Guidelines for signal connections - 15:09 Filtering capacitors - 16:22 Source termination resistors - 17:44 Layout and connection routing

0:29 MEMS microphone interfaces 2:07 Analog microphone implementation goals - 2:14 Sound capturing performance - 3:28 Performance stability - 5:51 Electrical robustness (RF immunity, good PSR) 7:09 Analog microphone implementation guidelines - 9:17 Good operating environment for the microphone - 10:29 The microphone signal path; noise, distortion, dynamic range - 15:02 Signal path disturbance mitigation; layout, shielding, disturbance filtering - 16:24 Ground - 18:11 Trace lengths, circuit board layout, shielding 19:34 Analog microphone interfaces - 20:03 Differential interface - 23:39 Single-ended interface

0:38 MEMS microphone implementation size - 2:03 Space taken by the sound channel - 2:34 Bottom port microphones - 4:03 Top port microphones 6:12 MEMS microphone placement in a device - 7:08 Distance to the surface of the device - 7:35 Location in relation to features of device housing (corners, edges, flat surfaces) - 9:00 Distances between microphones in a multi-microphone system - 11:05 Distance to noise sources within the device - 13:05 Distance to heat sources - 13:43 Location in relation to wanted sound sources and ambient noise sources - 16:31 Mechanical stress sources 17:08 MEMS microphone protection in a device - 17:17 Contamination - 19:28: IP rating - 20:18 Contamination protection vs. microphone performance - 21:58 Mechanical abuse and other external factors

0:32 MEMS microphone mechanical implementation 2:09 Acoustic sealing requirements 5:07 Acoustic sealing guidelines - 6:29: Sealing element properties; material, compliance, thickness - 9:36 Sealing with solder - 10:32: Sealing element alignment - 12:16: Challenging sealing cases 15:36 Handling noise

0:28 Acoustic channel 1:58 Goals for acoustic implementation 4:57 Acoustic implementation guidelines - 10:40 Ultrasound 13:08 Acoustic stability 16:01 acoustic modeling 16:40 Acoustic implementation examples

1:03 Implementation goals: Capturing performance 5:45 Implementation goals: Reliability 7:41 Implementation goals: Low cost 10:21 Implementation goals: Small size 12:12 Implementation goals vs. microphone count 16:35 How to reach implementation goals?

0:33 MEMS microphone ASIC 4:32 MEMS microphone functionality 7:49 MEMS microphone modeling 9:10 MEMS vs. ECM 12: 50 MEMS microphone manufacturing