"fo-Kannon" is a real-time spectrum audio analyzer (RTA) app for the iPad.
It uses the Fast Fourier Transform (FFT) to analyze incoming audio signals and provides a precision frequency response measurement and spectral visualization.

"fo-Kannon" is available in a variety of applications, such as room tuning, speaker test, audio equipment test, stage setting measurement and evaluation of sound mixing environment.

While adopting a signal processing algorithms with high accuracy, "fo-Kannon" has been designed to human interface friendly like classical measurement instrument.
In the frequency range of 20kHz from 20Hz, frequency scale in 30 split band of 1/3 octave, it is displayed in the logarithmic amplitude response of the measurement frequency.

TOON,LLC is a company that seeks the comfort of sound environment based on our acoustic proprietary technology, and we will provide tools for audio professional, sound technology, home theater installer, and anyone who loves audio.

Features:
-High performance software design for Real-Time Spectrum Audio Analyzing
-FFT frame size of 4096 points.
-44.1KHz sampling rate for up to 20KHz measurements.
-1/3 Octave (30 bands) display with a logarithmic dB scale.
-Time Constant facility (T.C.: Fast-30ms / Slow-300ms)
-Tracing facility of Peak/Level amplitude. (FUNC.)
-Tracing Hold facility.(HOLD)
-Pan to adjust visible amplitude ranges (RANGES: +20dB/0dB/-20dB/-40dB/-60dB)
-Pause facility freezes the live trace to aid analysis of data.(PAUSE)
-Monitor input signals.(MONITOR)
-Camera Roll capture facility (SNAPSHOT: 760x570 pixels Snapshot in PNG format).
-Corresponds with built-in microphone or headset microphone and external digital audio connection.

NOTE:
The microphone via the headset or built-in microphone of the iOS device, pass through a high-pass filter to attenuate significantly the low-frequency signal components.
We recommend that you use a measurement microphone that connects via the Dock connector or USB audio interface.