What's New

-Updated for latest iOS devices and new iOS versions
-Bug fixes and stability improvements

App Description

Transfer Function is a dual-FFT acoustic analysis app that is used for sound system audio analysis. Since it can operate with music as the signal source, it can be used during a musical performance to monitor and turn the system equalization during the show.

Transfer function includes:

-- Magnitude Graph
-- Phase Graph
-- Coherence Plot
-- Delay Finder
-- Signal Generator

Normally a transfer function requires a two-channel interface, and that is true with this one, also, if you want to use it with program material (music).

However, you can use our Transfer Funciton with the internal iOS microphone, if you can send the pink noise generator output to the sound system input. In this configuration, the internal generator is routed back to the input as the reference channel. You can measure delay, magnitude, and phase using this setup.

When you use Transfer Function with a two-channel audio interface to run, such as the Studio Six Digital iAudioInterface2, then you can also use any audio source as the test signal, including music.

See our website for more information.

iPhone Screenshots

(click to enlarge)

Transfer Function screenshot 1 Transfer Function screenshot 2 Transfer Function screenshot 3 Transfer Function screenshot 4 Transfer Function screenshot 5

iPad Screenshots

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Transfer Function screenshot 6 Transfer Function screenshot 7 Transfer Function screenshot 8 Transfer Function screenshot 9 Transfer Function screenshot 10

App Changes

  • February 23, 2014 Initial release
  • March 07, 2014 New version 1.1
  • March 10, 2014 New version 1.0
  • April 07, 2014 New version 1.2
  • May 06, 2014 New version 1.3
  • June 30, 2014 New version 1.4
  • October 02, 2014 New version 1.5
  • November 28, 2014 Price decrease: $79.99 -> $64.99
  • December 07, 2014 Price increase: $64.99 -> $79.99
  • January 27, 2015 New version 1.6
  • May 06, 2015 New version 1.7
  • September 19, 2015 Price decrease: $79.99 -> $49.99
  • November 23, 2015 New version 1.8
  • December 05, 2015 New version 1.9
  • February 19, 2016 New version 2.0
  • June 23, 2016 New version 2.3
  • November 06, 2016 New version 2.4
  • November 21, 2016 New version 2.5
  • November 25, 2016 Price decrease: $49.99 -> $32.99
  • December 04, 2016 Price increase: $32.99 -> $49.99
  • June 13, 2019 New version 3.0
  • August 16, 2019 New version 3.1
  • October 15, 2019 New version 3.2
  • October 27, 2020 New version 4.0
  • August 05, 2021 New version 4.2
  • October 15, 2021 New version 5.0
  • September 16, 2023 New version 5.1
  • November 15, 2023 New version 5.2