dsp mobile

All iDevices running iOS 5 have a built-in low cut filter for the built-in microphones and the headphone jack input.

schematic frequency response of iDevices running iOS 5.x

This issue has been solved by Apple since iOS 6.

The reason for the low cut of the pre-iOS 6 devices is – as we believe – that they are designed mainly for recording and processing human speech. This high-pass represents a serious drawback for all kinds of frequency related measurements based on the use of the built-in microphone or the headphone jack. We gave this problem a lot of thoughts and decided to develop a compensation.

Please note: the compensation curves (offered as In-App purchases in the Analyzer and the Spectrograph) compensate for the corresponding device, microphone and (in the case of running iOS 5.x) the heavy low cut filter. In the latter case we are aware that the compensation pushes the noise in the low frequencies, but after much testing done by experienced sound engineers we are very happy with the results! Compensation curves are available for the built-in microphones (on Analyzer included), selected headsets and the i-series mics i436, i456 and i266 from MicW. We offer the frequency responses as In-App Purchases. You can get them by visiting the store in the menu.

The compensation for the measurement microphone i436 from Mic-W includes a setting for the individual sensitivity given in the manual of each i436. In Germany, Switzerland and Austria all products from Mic-W are distributed by Synthax GmbH. 

If you are running our Apps on iOS 6 or later, the compensation curves linearize the frequency response of the corresponding microphones and devices.

Frequency responses of the iDevices running iOS 6 (measurement mode activated):

iPhone 4S, 5, iPad 2-4 headset-in frequency response

iPhone 4 frequency response

iPhone 3GS frequency response

iPod Touch 4 frequency response

Here are the frequency responses of some external mics available for iDevices attached to the headset input:

Mic-W i436 frequency response

Mic-W i266 frequency response

Mic-W i456 frequency response

The MicW i436 manual provides an individual sensitivity value. We integrated this as a setting in the i436 info page:

our crew making measurements…

Hi everybody, there’s a new update available: we improved the facebook performance and enlarged the facebook button – get it now!

One step further: our next app has made it! With dB Volume+ you can post everything on facebook: noise level, geodata, picture, comments… You could use it for analyzing noise levels in National Parks, around airports or for documenting your nights in the clubs – but let’s see what you’ll make out of it…

Our next App made it through! We are proud to present our free of charge App dB Volume. You can measure the sound pressure level (SPL) and share it directly on facebook – we are really curious, how you will like and use this feature!

We experienced a latency problem at the Analyzer on some devices – and we fixed it. The necessary update (1.0.2) is already in review at iTunes, so it should be online in a few days. To get the best performance please make sure to get this update as soon as it is available – we will inform you via facebook, twitter and on this site!

It’s really exciting – we are happy to announce that we put our next App into the pipeline: dB Volume is now waiting for review in the App Store! It’s for free! With dB Volume you can measure the Sound Pressure Level (SPL) and post it directly in facebook – we are really curious, what resonance we’ll get…  🙂

At the moment we are listed on rank 24 in the german Appstore – and we even have a screenshot in the new iPad apps category – wow!!!

So we made it… the Analyzer is available on the App Store – it means you can really have it if you want…

We are very happy and proud!!!