Technical Note-i436 Frequent Asked Questions
Contents
1. Question 19 How do know the i436 is connected to the iPhone Answer 19 The APP software such as SigScopePro has indication when external microphone is inserted into the headset connector al PEGA A 14 52 30 wl PEA A 14 52 Q 3 Built in Mic gt 2 Headset Input gt gt wh oo LL Le oO D i 5 Frequency Hz Octave Built in Mic 1436 is inserted MicW TN 1402 gt Question20 What is the pin definition of headset input of Smartphones gt gt Answer 20 The most of Smartphone s including iPhone Galaxy and MotoX on the market have the following pin definitions MicW TN 14022. 10 What are the typical frequency responses of i436 and how the results related to IEC61672 standard Answer 10 The typical frequency response of i486 is shown in black line of the following chart The red lines are the limits specified in IEC 61672 standards for Class 1 Sound Level Meter Our production are followed those limits as quality control MicW TN 1402 Frequency Hz Question 11 What responses correction data can use to generate the microphone calibration files Answer 11 The typical calibration data for 1436 is as follows The data should be added to the measurement results to obtain the frequency corrected results This is common way in audio measurements MicW TN 1402 The Typical Frequency Response of i436 Frequency Hz Corrections dB 20000 gt Question 12 What kind of software could i436 work with Which is the price range gt Answer 12 lt can work with most of the Sound Level Meter Real Time Analyser RTA and Recording software The software is available in App Store and Google Play The price ranges from 1 0 to 500 We did not fully test any software against IEC61672 standard Please note that the MicW TN 1402 different software could give you different results We tested SignalScopePro and DSP mobile which have professional calibration functions Question 13 How to calibrate the system with Sound Level Calibrator Answer 13 lf you have a sound level ca
3. Mic ll Technical Note 1402 1436 Frequent Asked Questions gt Question1 Studio Six Digital acclaimed that We have thoroughly tested MicW and our conclusion is that it does not improve on the performance of the built in Apple device microphones whether the iPhone mic or the supplied headset mic other than in appearance and in the fact that it is a couple of inches away from the iPhone This is because any mic that plugs into the headset connector is subject to the same filters as the Apple mics There is no way to avoid the effects of the severe Apple low frequency roll off filters so any mic plugged into the headset connector suffers from the same problems Is this true or false gt Answer gt This is the false statement We have tested the headset input of iPhone 5 5S and 5C The results show that the frequency responses of the iPhones are flat There are no roll off filters in the headset inputs The third part test results published in www faberacoustical com confirmed our conclusions Here is the result in the web MicW TN 1402 SignalScopePro Source Headset Input Cc ah w 2 gt oO LU w LL uw E te gt faa Oo 10 00 z Frequency Hz Notes iPhone 5 Headset input 1 3 octave Leq iOS 6 Question2 What is the minimum sound pressure level iPhone or iPad can measure Answer 2 35dB A IPhone 5 and above Question 3 What is the maximum sound press
4. ibration without the calibrator MicW TN 1402 gt Question 15 How accuracy does iPhone or iPad with i486 measure overall dBA for Pink noise gt Answer 15 We made comparison measurements in our Anechoic Chamber with BSWA801 Class 1 sound level meter We used a loudspeaker to generate the Pink noise and used BSWA CA114 to calibrate both iPhone device and BSWA801 The measurements are taking at the same position The overall dBA readings from two devices are within 1 0 dBA gt Question 16 How does the i436 perform under high temperature and humidity environments gt Answer 16 Three i436 microphones were tested in the environmental chamber for 18 5 hours under 40 C and 95 RH humidity The related sensitivity changes are within 0 5 dB 1436 Sensitivity Changes under 40 C and 95 RH for 18 5 hours 90 89 88 87 86 85 aa Ee oD 2 a oD x 84 83 82 81 i MicW TN 1402 Question 17 How to measure Reverberation Time and other room properties using 1436 Answer 17 There is an excellent document on how to measure reverberation time and room parameters by Odeon The application notes can be downloaded from http www odeon dk pdf Application Note Smart Phone Measurements pdf You can measure RT30 RI20 ETD C80 using i436 and Odeon software Question 18 What APP do you recommend for STIPA Speech Transmission Index measurements Answer 18 We recommend iSTI Professional from Embedded Acoustics
5. librator such as BSWA CA114 www bswa tech com the calibration is simply to follow the software instruction 1 Insert i436 into the calibrator and switch on the calibrator 2 The calibrator will produce 94dB at 1000 Hz BSWA CA114 3 Go to the calibration screen of the software Some software needs manual adjustment The reading should be 94dB as shown in the software 4 An example of the calibration is shown in the following picture 5 After the calibration go back to the measurement screen The reading should be 94dB with the calibrator on MicW TN 1402 The calibration procedures are very much software dependent Please read the software manual on Calibration CA114 Calibrator tiput Headset Input The followings are example of using SigScopePro from Faber Acoustics MicW TN 1402 Configuration General pa w Tu u aa Oo a _ Press I O Device Configuration Configuration O Device Options JO Device Options Headset Input Input Options Input Source Input Device Headset Input Hendeet inna Input Channels All Channels Audio Play Through l Units Pa gt Enable Bluetooth Input DC Blocking Filter Device Units Calibrate 119 00 V FS Gain m 0 0 Output Options Headphones Prefer Speaker Output O Press Input Channels Press Calibrate MicW TN 1402 Headset Input Headset Input Ref Input Level Input Sensitivi
6. ty Calibrate When the calibrator is on Press Calibrate The reading should be 94 0 Done Question 14 How to Calibrate the system without Sound Level Calibrator Answer 14 lf you do not have a sound level calibrator you also can calibrate the system with the sensitivity provided with each i436 The sensitivity value is shown in the User s Manual MicW TN 1402 For example the sensitivity of 6 9 mV Pa means the output voltage from i436 is 6 9 mV when it is exposed to 94 dB or 1 0 Pascal sound field The calibration procedures using the sensitivity value is software and hardware dependent The hardware may have amplification factor in the headset input We tested IPhone 5S The input amplification factor is 1 26 ecooo HEB SF FF2 03 eccoo HABI FT F4F1 59 lt Headset Input Headset Input lt Headset Input Headset Input 60 80 dB SPL rms _ Ref Input Level Quantity dB SPL rms Input Sensitivity 60 80 dB SPL rms Input Sensitivity 213 4 5 6 7 8 9 0 Ee O S S S S a Example SignalScopePro with iPhone 5S step 1 Calculation Input Sensitivity Input Sensitivity Sensitivity from the Chart x Amplification Factor 6 9x1 26 8 7 For iPhone 5S Amplification Factor 1 26 Step 2 Go to the calibration screen and manually input 0 0087V Pa 8 7 mV Pa in the Input Sensitivity The calibration is done The Amplification Factor is the most important factor to do the manual cal
7. ure level iPhone or iPad can measure Answer3 120dB iPhone 5 and above Question 4 Does it work on Apple Notebooks too Answer 4 Yes It works with Apple Notebooks Question 5 Does it work on Window PC Answer 5 Yes it works but it requires CB013 cable You need to plug the i Series mic into CB013 first and then plug into the microphone port in the PC Question 6 Does it work on other phones Android Answer 6 Yes It works with Samsung Galaxy Moto X and most of Android phones Question 7 Is there a chance to integrate some kind of pad switch or make some special low sensitive model The Car Hi Fi and Live Engineer guys are asking for 150dB Answer 7 We have AT020 attenuator for 20dB pad However the current design of i436 can only achieve 130 dB even with AT020 attenuator For 150dB the engineers may have to use our Professional M series microphones such as MicW M215 MicW TN 1402 Question 8 What is the bit depth and the sampling rate of the iPhone Answer 8 The iPhones use 24 bits and 48kHz sampling This specification may change with new iPhone Question 9 What kind of spilt cable is supplied in the i486 Kit hope it is with Cinch RCA Connectors for Line Out Answer 9 The 1486 Kit includes 1486 microphone split cable extension cable 2meters clip and windscreen The split cable has two 3 5 mm jacks one for microphone and the other for earphone i456 and i266 kits have the same accessories Question
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