Question 1
I am looking into using the i436 product as part of a sound analyser solution as I understand it achieves Class 2 status. If successful, this could result in a large number of your products being purchased.
I understand that there is a 200Hz hi-pass filter at the input stage of the iPhone and iPad devices which would limit the frequency range of such a system. Has this been corrected somehow within the microphone circuitry? Otherwise it would seem that its designation as a Class 2 microphone for such applications is misleading!
Answer 1
The I436 is designed and manufactured according to our measurement technologies. The i436 meets the IEC 61672 Class 2 requirements when it inputs high end sound cards. But if it is connected to iPhone or iPad, the accuracy is depended on the software. The i436 does not have the correction for low frequency. The correction should be done on the software part.
In conclusion, i436 meets the Class 2 standard. But i436 with iPhone sound card and RTA software will need some correction at low frequency to meet the Class 2. The customers need to know the limitations.
Question2
What is the minimum sound pressure level IPhone or iPad can measure?
Answer2
234 dB (A)
Question 3
What is the maximum sound pressure level IPhone or iPad can measure?
Answer 3
102 dB.
Question 4
Does it work on Apple Laptops too
Answer 4
Yes, It works
Question 5
Where does that little peak in the frequency response (15kHz) come from?
Answer 5
It related to the diaphragm resonance frequency of the microphone capsule.
Question 6
Does it work on other phones (Android)
Answer 6
We did not test i436 with other phones
Question 7
Is there a chance to integrate some kind of pad-switch or make some special low sensitive model. the Car-HiFi and Live-Engineer guys are asking for 150dB!!
Answer 7
It is possible to design a special cable with -20dB or -40 dB pad to low the sensitive. However the current design of i436 can only achieve 130 dB even with special pad cable. For 150dB, the engineers may have to use N401 microphone which can handle 160dB.
Question 8
What is the bit depth and the sampling rate of the iPhone
Answer 8
The iPhone 3 and 4 use 24 bits and 48kHz sampling.
Question 9
Is there a chance to integrate an inverted frequency response to the Iphone Low-Cut in an app?
Answer 9
Yes. It can be done in the software. For the recording application, the software allows the users to control the gains at each octave bands. For the measurement application, the users have to look into the software specifications. The i436 only gives the flat frequency response.
Question 10
What kind of spilt cable is supplied in the kit of the i436, I hope it is with Cinch/RCA-Connectors for Line Out.
Answer 10
The i436 Kit includes i436 microphone; split cable, extension cable (3meters), clip, windscreen. The split cable has two 3.5 mm jacks, one for microphone and the other for earphone.
Question 11
Is there a comparison chart between the integrated mic of the iPhone and the i436
Answer 11
No, but we are planning to do the comparison measurements in our anechoic chamber.
Question 12
What kind of software could i436 work with? Which is the price range?
Answer 12
It can work with most of theSound Level Meter,Real Time Analyser (RTA)andRecordingsoftware. The software is available from App Store. The price ranges from $1.0 to $500.
We did not fully test any software against IEC61672 standard. Please note that the different software could give you different results.
