Description - iOS app / Audio Tone Generator

Audio Tone Generator - Reference Audio Test Signal Tools


"Audio Tone Generator" is a high quality Audio Signal Generator application for iPhone, which creates the Audio Reference signals as Sinewave, Frequency Sweep, White Noise and Pink Noise. This app is an advanced version of the "Audio Tone Generator Lite" app.

It creates the reference Audio test signals as Sinewave, Frequency Sweep, White Noise and Pink Noise, and has a high precision of DVD quality and a frequency accuracy of 0.1Hz. Frequency Sweep time can be altered as desired by the user.

By the version 3.0, it has been added a new feature of the band-pass filtering on NOISE mode. We also offer "Octave Band Noise Generator" which enhanced the noise generation function. It can programmably generate the reference noise signal of 1/1 octave band and 1/3 octave band.

atg_sine atg_sweep atg_pink

It will help you to make the benchmark for your audio equipment and loudspeakers, your listening environment and room acoustics or your hearing. The signals created by this app can be best used in conjunction with external devices, such as an audio spectrum analyzer or a sound level meter.

In addition, by having you to use it in conjunction with our Real-time Audio Analyzer app "fo-Kannon" or 「Audio Frequency Analyzer」, it can be easily measured the frequency response of your Audio system. Please use this app as the standard pink noise signal generator.

Please to click the following link to download "Audio Tone Generator" from App StoreTM. It will be open the download page on App StoreTM.

It will move to another site, download from Apple Store

Installation of iTunes is required.
Communications charges when connecting to the App Store will be borne by the customer.
* iPhone, AirPlay is a trademark of Apple Inc., registered in the U.S. and other countries.

* App Store is a service mark of Apple Inc.

Products Information

Version : 3.4
Release date : November 29, 2016 UTC
Size : 1 MB
Category : Utilities, Music
Recommendation : Requires iOS 10.1 or later.

Sound source generation

"Audio Tone Generator" app can generate the following signals.

Sweep Sinewave
White Noise
Pink Noise(1/f noise)


Optimized for iPhone, Compact code size.
Sinewave generation - Preset frequencies : 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, 12kHz, 16kHz, 440Hz(A4)
Frequency sweep of Sinewave generation - Preset frequencies : 20Hz-20kHz, 200Hz-4kHz, 1kHz-8kHz, 220Hz-880Hz
Supports of Sinewave frequencies range between 20Hz to 23999.9Hz
Sweep Time Control : time span from 10 seconds to 180 seconds.
Pause function in Sweep mode.
Frequency Accuracy : 0.1Hz
Direct frequency input by the keyboard
White Noise and Pink Noise generation with Filter processing :
- High pass filter (HPF) : 100Hz, 400Hz, OFF

- Low pass filter (LPF) : 4000Hz, 8000Hz, OFF
Output Gain Control
DVD Quality Output : 48000 samples/sec.


"Audio Tone Generator" can be very useful for a variety of applications including:

Testing Speakers and Headphones
Testing and tuning Audio amplifiers, Equalizers and many other Audio equipments
Acoustics testing
Frequecy response testing for Audio systems using WHITE and PINK noise generation

How to use - Top View

In the time of starting this app, you can see the operation setting area at the top, and the control area at the bottom.

In the control area, you can select one operating mode from Sine-wave mode(SINE), Sinewave sweep mode (SWEEP) and noise mode(NOISE). In addition, you will be able to control the playback volume and Play/Stop.

In the operation setting area, you can see the parameter of the operating mode that has been selected in the control area.

atg_startup_sine atg_startup_sweep atg_startup_noise

In addition, by tapping the i-button at the upper right, the product information is displayed. If you tap "toon's site" button, Safari starts and you can see our support page. If you tap "To App Store", you will see our App's information on "App Store". If you return the operation, please tap the i-button again.

How to use - SINE Mode

This is the mode for generating a Sinewave signal.

If you touch the frequency display monitor, it is possible to use the keyboard. In keyboard input, you should set a frequency of 23999.9Hz from 20.0Hz. It should note that the initial value is not entered at the application startup, you will need to be set the frequency of up to one decimal place.

Further, the signal can be set from frequency of the eight types by tapping a preset button. It generates a tone signal by PLAY button, and stops by STOP button.

sine_input atg_sine

How to use - SWEEP Mode

This mode is used to generate a frequency sweep signal.

It generates a sinewave of transitional frequency continuously in the frequency range of 23999.9Hz from 20.0Hz. If you touch the frequency display monitor, it is possible to use the keyboard. In keyboard input, you should set both the upper and lower limit frequency. It should note that the initial value is not entered at the application startup, you will need to be set the frequency of up to one decimal place.

In addition, you can set the frequency of the two types by tapping a preset button. There are two PLAY buttons that can be generated rising sweep and downward sweep. Generates a tone signal sweep by PLAY button, and then sweep on 10 to 180 seconds by setting of "sweep time" . Default time is 60 seconds. It stops the generation of tone signal by STOP button.

During playback, PAUSE button (II) is displayed, you can suspend when you tap it. If you want to resume, please tap PLAY button again. Note that you can not change the setting of frequency and sweep-time in the paused state. Further, if you want to reset the paused state, please tap STOP button.

atg_sweep_input atg_sweep

How to use - NOISE Mode

This mode is used to generate White and Pink noise. You can select one of either Pink or White noise. It generates a signal by PLAY button and stops by STOP button.

In addition, for the the noise source, the signal can be output with a limited frequency band through a high-pass filter (HPF) and a low-pass filter (LPF). The cut-off frequency of the HPF and LPF are as follows:

Filtering frequency for noise signals
* High pass filter [HPF] - 100Hz / 400Hz
* Low pass filter [LPF] - 4kHz / 8kHz

atg_white atg_pink


Audio Tone Generator version 3.4 was released on November 29, 2016.
Audio Tone Generator version 3.3 was released on March 9, 2016.
Audio Tone Generator version 3.2 was released on January 6, 2016.
Audio Tone Generator version 3.1 was released on November 22, 2015.
Audio Tone Generator version 3.0 was released on November 17, 2015.
Audio Tone Generator version 2.0 was released on November 5, 2014.
Audio Tone Generator version 1.0 was released on April 8, 2014.


Please be careful that continuous high-volume and high-frequency signals can damage speakers, even if your ears don't perceive them as being too loud.

If the silent mode is turned on, all iPhone sound outputs are disabled. To enable the sound output, please be sure to turn off the silent mode in the iPhone' settings, "Settings/Sounds" or Control Center.

On the keyboard-input of frequency, please press the return key after entering a numeric value. Also, in the sinewave sweep mode, please press the return key after entering two numeric values continuously.

AirPlay data transmission is a wireless communication system using Apple's proprietary audio data compression. For this, there are cases where the random sound noise is generated by radio condition and the compatibility of AirPlay connection equipments. Note that it may occur at particularly high frequency band.

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