Wednesday, 14 October 2015

First Bone Conduction headphone is coming

Hold tight!

A new version is "really" on its way to be published with the support of the Panasonic HGS10 bone conduction headphone.

I just need to fully calibrate it with my professional audiometer and "dummy head" and then I will release it to Apple Store.

Thanks for the patience.

Sunday, 24 May 2015

A new version in coming

In the next 3 weeks I will publish a new release of Audiogram Mobile.
This version will:

Bone Conduction
A new pre-calibrated bone conduction headphone supported. I just purchase the Panasonic RP-HGS10E-P and in a few day I'll calibrate them using my professional Audiometer
You can find those headphone at < 50$ on Amazon/eBay

If you have any headphone (aerial or bone) that you want to calibrate drop me a mail and we can arrange to ship them to me (to Italy) and back!

Aerial Conduction
A few user asked me to support the new Bose SoundTrue AroundEar. I'm a big fan of Bose headphone because:

  1. they have an acceptable low impedance of 32Ohm. Consider that the lower is the impedance the higher is the reachable volume
  2. they are very light and confortable for the patient.
  3. the Around Ear cushion are very solid and you can buy a replacement cushions on eBay for 10$

Those headphone will be pre-calibrated in the new version!

Other aspects

  1. The App has been updated to reflect the new IOS 8.3 guide lines and to support Apple 64 bit processor.
  2. I rewrote the "save to gallery" part in order to fix some sporadic bugs
Happy Testing!

Monday, 8 December 2014

Panasonic RP-HTX7 calibration values!

The impedance is 40 Ohm that compared with the 10 Ohm  of the Telephonic and 32 Ohm of the Bose is quite high but is fine for iPad/iPhone

Remember: if the impedance is too high the iPad is not enough powerful to reproduce the lower frequencies like 250 Hz and 500 Hz at high volume.
This is also the reason I cannot go louder then 90 dB HL.

You can buy a new one for 50$-80$

Here a few screenshot of the headphone:.

and the official panasonic product page:

Calibration values are the following:

frequency: 125  250 500  750 1000 1500 2000 3000 4000 6000 8000
values:     89   85  74   60   56   56   60   68   76   56   59

Thanks to Dave (Woodinville WA - USA) for the provided values!

Sunday, 7 December 2014

New calibration method (and happy review!)

I just came across to a happy customer review that, beside the positive response ;-) it explain a new way to easily calibrate the App.
Read the review and pay attention to the bold section.

This is the mentioned SPL Meter App:


Great Money Saver
4.0 star by Imagine Peds - 08/ott/2014

I have a Speech Therapy Clinic and insurers are now requiring that all kids have a current hearing screening performed before services are approved. 

Physicians do not typically screen kids until much later, and it’s hit or miss.  Also, report data from school screenings are not made available for use. 

Speech Therapists are licensed to perform screenings, so we chose to do them in house as part of our evaluation process.  Problem is that the basic equipment is $1200 plus. 

While doing some research I came across this gem.  It works extremely well… perfect for screenings.  

We already use iPads and we had a pair of Sony MDR-V6’s which are well suited for screenings. 

It is very easy to calibrate any suitable closed ear headphones using the calibration menu and another App Store gem called SPL Meter by Andrew Smith (simply place the EarPod mic in the ear cup and put them on your head). This process can easily calibrate within +/- 3 dB… well within the ANSI specifications.  

I would have rated 5 stars, but it appears there is an unresolved issue with AirPrint (it doesn’t work).  (Now Works in Ver 3.2)

For now, I am using the email report option which works fine.

ver. 3.1.6


Important Note: Always use "A" WEIGHTING with SPL Meter in order to have the same response curve of the professional Audiometers.

App Reviews

My App is in the market since May 2013 and since that I sold 300 copies.

Quite a good success!

I received many happy customer mail and some feature missing and bug complains.

Unfortunately I don't have so many official Apple Store reviews to let Apple show the 6 reviews i received so far.

If you are an happy customer please, leave a positive review in the App Store!

If you are not happy, please, write a mail to me! and I will try to solve your issue

Saturday, 20 September 2014

Telephonics TDH-39P

This is one of the common audiometric headphone of the market.

The impedance is very low, only 10 Ohm compared with the 32 Ohm of the Bose so they are very powerful and easy to be driven by the iPad/iPhone with quite low calibration values.

There is also a 100 Ohm version that is a little too much for the iPad/iPhone especially at low frequencies.

You can buy used ones on eBay for 70$-100$

For Telephonics TDH series spec follow the link.

Calibration values are the following:

frequency: 125  250 500  750 1000 1500 2000 3000 4000 6000 8000
values:     99   81  57   50   48   46   54   51   57   52   74   

Tuesday, 2 September 2014

New Version 3.2.0 is coming (September the 13)

I'm in "beta testing" of the last Audiogram Mobile version.

Here the new stuff:

Major Enhancements:

  • New set of sound samples with 1db step instead of 5db
  • New initial menu in order to accommodate more tests like "Speech Audiometry" and "PAR test" coming in next versions!
  • Added note field to customer data in order to store medical information
  • You can now swap the position of the charts
  • You can now choose, add and edit customer data directly from the audiometric screen
  • Graphic Improvements here and there
  • IOS 7.1 supported
  • Direct access to support web site
  • Sennheiser HD-201 headphone pre-calibrated. The average cost of the headphone is 25$ / 20€

Bug fixing:

  • Fixed an error that sometimes appeared when changing the frequency or volume
  • Fixed a bug that prevent the birth date change

Release date: September, 13 

Some ScreenShots: