Comments on: iPhone Microphone Frequency Response Comparison

By: Mike

Mike — Thu, 19 Jan 2012 15:56:03 +0000

ben – thanks for the reply. I will let apple know my feelings, for what that is worth.

it would be nice if developers could tweak the mic for full range response in their apps for whatever they desired. i dont understand why apple would restrict this if it is a software filter.

do you know for sure if the HPF is in software or is it in hardware on the PCB?

thanks again,
mike

By: Mike

Mike — Thu, 19 Jan 2012 15:51:14 +0000

(sorry for the dual post – my browser didnt update and i thought the first one didnt take – please delete)

By: Mike

Mike — Thu, 19 Jan 2012 15:50:18 +0000

hi –

Is there any way to alter/acess the HPF for the iphone microphone in the iOS5 SDK?

Im curious if the bass response for your sound meter apps can work at an extended bass range.

Thanks!
Mike

By: ben

ben — Thu, 19 Jan 2012 15:42:37 +0000

Mike,

I wish there were. We need more people to tell Apple how important this is to them.

Ben

By: Mike

Mike — Thu, 19 Jan 2012 14:57:42 +0000

Hi ben,

At this time with iOS 5.x and the 4S, is there any way in the iOS SDK to internally turn off or alter the internal mic HPF to extend the low frequency response for your measurement programs?

Just curious.

Thanks,
Mike

By: Tai

Tai — Mon, 19 Sep 2011 17:09:53 +0000

Good day!

You mentioned about the anti-aliasing filters that begin to roll off the high frequencies somewhere between 20 kHz and 24 kHz. So will the phone still be able to receive frequencies above the 24 kHz range? I read somewhere about it being able to detect to as high as 48 kHz. True?

What will be the frequencies accuracy range?

Thank you.

Thanks alot!

By: Tick Talk » Kello Featured in iW Magazine

Tick Talk » Kello Featured in iW Magazine — Sat, 23 Jul 2011 03:14:58 +0000

[...] On Microphones To get the best results with Kello, a mic with a consistent frequency response up to 20kHz is ideal. A lot of inexpensive microphones have a frequency response that caps out at 4kHz. You can read more on frequency response here. [...]

By: ben

ben — Thu, 09 Jun 2011 15:46:25 +0000

Oliver,
Check out the iPhone 4 article in the iPhone category.
Regarding your tuner, the low frequency attenuation of the iPhone 4 may affect the lowest octaves, but you also need to consider the quality of the tuner software.
Ben

By: Oliver Tangen

Oliver Tangen — Fri, 03 Jun 2011 10:40:35 +0000

Hi Ben

Do you know if the mic on the headset that goes along with the iPhone 4 is any better? Could you do a test on the built in mic on iPhone4 and the headset?

I’m trying to find the best way to tune a piano with a good tuner, but the tuner I currently use seems to have problems knowing what octave/frequency I’m playing. Ex. it mixes up a A3(220Hz) and A4(440Hz). Any suggestions? And yes, I’m actually tuning pianos with my iPhone and it works! But the built in mic on a HTC Desire I tried was so incredibly accurate so I’m considering switching over to that one..

By: Tomlinson Holman To Head Up Apple Audio? | The Sonic Spread

Tomlinson Holman To Head Up Apple Audio? | The Sonic Spread — Mon, 09 May 2011 05:31:29 +0000

[...] Photo courtesy of FaberAcoustical [...]

By: iPhone Microphone Frequency Response Comparison « twenty thousand hertz

iPhone Microphone Frequency Response Comparison « twenty thousand hertz — Tue, 26 Apr 2011 19:20:31 +0000

[...] the rest of this article from FaberAcoustical here! Tagged as: 3g, frequency response, iphone Leave a comment Comments (0) Trackbacks (0) ( [...]

By: Simon Logan

Simon Logan — Sat, 19 Mar 2011 23:41:37 +0000

Thanks Ben. I’ll need to do some more playing around with this.
Simon

By: ben

ben — Thu, 17 Mar 2011 22:27:38 +0000

Simon,
Measuring microphone response is not a trivial task. Also, the measurements shown above were all made relative to a lab-grade microphone that meets or exceeds the specifications for a Type 1 sound level meter.
Ben

By: Simon Logan

Simon Logan — Thu, 17 Mar 2011 22:05:58 +0000

Hi Ben,

How did you get the nice smooth graphs you show above? When I measure a sweep or white noise (generated from SignalScope Pro) in the FFT analyser, the graph is much more spiky across the entire frequency range.

Thanks,
Simon

By: Sharron Clemons

Sharron Clemons — Tue, 21 Dec 2010 20:21:28 +0000

Existing dock connector input devices were designed under Apple’s Made for iPod program, which did not account for the iPhone. The iPhone is a mobile phone, which produces noise that can interfere with audio signals, and it can also be affected by the presence of accessories that were not specifically designed to be operated with a mobile phone. So, the iPhone OS gives you the option to switch to Airplane Mode, so you can operate your iPhone essentially as an iPod to avoid any interference concerns (for the phone or for the audio signals). You can still use the accessory, whether or not you choose to switch to Airplane mode.

By: Bilal

Bilal — Thu, 04 Nov 2010 23:12:10 +0000

Hi,

Very interesting article. Please could you confirm whether you tested the lower frequencies, i.e less than 20 Hz, or is it just an extrapolation. Also, I would be grateful if you could explain the y-axis notation i.e.dBFS/FS. I am only familiar with dB

By: ben

ben — Fri, 22 Oct 2010 22:11:50 +0000

Our apps operate the I/O at 48 kHz, which yields a theoretical upper bound of 24 kHz. Frequencies close to 24 kHz will suffer greater attenuation due to the antialias filters in the audio codec.

By: Peter Green

Peter Green — Wed, 20 Oct 2010 19:09:29 +0000

Could you tell me what is the highest frequency that the 3GS & iPhone can receive, please?

By: ben

ben — Thu, 07 Oct 2010 21:53:36 +0000

Any microphone response testing done with the new iPhone 4 to see how it compares?

Yep.

Have you tested Signalscope Pro on an iphone 4 with OS 4.1 to check compatibility?

Yep.

By: Jeff

Jeff — Thu, 07 Oct 2010 21:40:31 +0000

Any microphone response testing done with the new iPhone 4 to see how it compares?

Have you tested Signalscope Pro on an iphone 4 with OS 4.1 to check compatibility?

Thanks.