Audio Signal Generator

Tone and Noise Test Utility

FreeOffers In-App Purchases

1.8.0for iPhone, iPod touch

8.7

79 Ratings

Media Punk Studios

Developer

13.7 MB

Size

Dec 3, 2019

Update Date

Utilities

About Audio Signal Generator

Signal Generator is an app that produces audio test tones. The basic app produces sine waves, and it can be extended and customized (via in-app purchases) to produce white noise, pink noise, frequency sweeps, and (on iPhone 4 and better) square waves, sawtooth waves, and triangle waves.

• Free Tone Generator. The app includes a free sine wave generator that generates signals from 20 Hz to 20 kHz, with a 48 kHz sample rate, 16-bit samples, and 96 dB of dynamic range. Frequency control via logarithmic knob or keyboard input.

• Pro Tone Generator. (Optional in-app purchase). Extends the frequency range down to 1 Hz, and adds stereo control and buttons to increment the frequency in steps. Anti-aliased square waves, sawtooth waves, and triangle waves are generated with aliasing kept to -54 dB or less.

• Noise Generator. (Optional in-app purchase). Produces white noise, pink noise, and brown noise. Pink noise falls off at 3 dB per octave (±1 dB). Brown noise falls off at 6 dB per octave. Option for stereo uncorrelated noise, or mono correlated noise.

• Frequency Sweeps. (Optional in-app purchase). Adjustable start and stop frequencies. Linear or logarithmic sine wave frequency sweeps. Single shot sweeps, repeating upward sweeps, and upward/downward sweeps.

This app can be used to:

• Test Speakers and Headphones
• Balance your Home Theater System
• Tune Your Car Audio System
• Mask Environmental Noise
• Burn In Headphones
• Tune Musical Instruments

What's New in the Latest Version 1.8.0

Last updated on Dec 3, 2019

Old Versions

Play/pause function is independent of gain settings.
Frequency sweep time extended from 0.2 to 60 seconds.
Noise source can be set to correlated (mono) or uncorrelated (stereo).
Frequency range boundaries conform to ISO frequencies.

Version History

1.8.0

Dec 3, 2019

1.7.3

Jul 8, 2015

Fixed a crash that would occur during start up under certain conditions. Fixed the sweep mode button forgetting its last state.

1.7.2

Jan 24, 2015

Fix for a UI issue. (A number of buttons performed the wrong function. Thanks for the feedback!)

1.7.1

Jan 11, 2015

Slower frequency sweeps. Up to 32 seconds.

1.7.0

Dec 16, 2014

Extended the frequency range to include infrasonic frequencies as low as 1 Hz for the Tone Generator, and 2 Hz for the frequency sweep. Frequency sweeps now include an up/down mode and a real-time frequency display. Also includes other various improvements. Updated for iOS 8.

1.6.0

Jan 7, 2014

Square, sawtooth, and triangle waves are available in the pro tone generator (on iPhone 4 and up), with aliased harmonics kept at least 54 dB below the fundamental. Updated for iOS 7.

1.5.0

Oct 3, 2013

left/right output control
half-seconds sweeps
addressed issue with distortion in brown noise and in high-volume output
verified second harmonic of a 5 kHz tone is 92 dB below fundamental

1.4.0

Jun 21, 2013

Looping frequency sweeps and real-time control of sweep parameters. Buttons to increment tone generator frequency by a number of semitones, cents, or hertz. Brown noise. iPhone 5 display optimization.

1.3.2

Feb 14, 2013

Fix for bug where audio was broken after returning from another app.

1.3.1

Jan 21, 2013

Addressed issues with silent audio, in-app purchases, and canceling text entry.

1.3.0

Nov 6, 2012

Pink noise. Logarithmic frequency sweeps. App remembers knob positions between sessions.

1.2.0

Oct 29, 2012

• Frequency sweep generator (with in-app purchase)
• Able to remove ads (with in-app purchase)
• Fixed bug when jumping between frequency and gain text fields.

1.1.0

Oct 5, 2012

Now includes the option to add on a white noise generator (paid upgrade).

1.0.0

Aug 1, 2012

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