Simple Guitar Tuner Pro - Precision Musical Instrument Tuning for iOS

June 18, 2015 in Music (F)

[] Munich, Germany - Developer Ullrich Vormbrock is proud to announce the release of Simple Guitar Tuner Pro 1.0 for the iPhone, iPad, and iPod touch. This easy-to-use chromatic guitar tuner offers high precision, "tuning by ear," and a wide frequency range to all tuning of a wide range of instruments, including: Bass, Cello, Contrabass, Guitar, Ukelele, and many more.

In addition to the high precision, Simple Guitar Tuner Pro offers a wide frequency range, so that the following instruments can be tuned:
* Bass (30.87 Hz to 98 Hz)
* Cello (65.41 Hz to 220 Hz)
* Contrabass ( 82.41 Hz to 196 Hz)
* Guitar (82.41 Hz to 329.6 Hz)
* Viola (130.8 Hz to 440 Hz)
* Mandolin (196 Hz to 659.3 Hz)
* Violin (196 Hz to 659.3 Hz)
* Ukulele (146.8 Hz to 440Hz, depending on tuning)
* Piano (partially: 27.5 Hz to 987.8 Hz, frequencies above can't be detected with enough precision)

Here some additional information about the technical background in conjunction with pitch detection:

As often misunderstood, pitch and frequency are not the same thing: while frequency is a pure physical quantity, pitch has to do with perception or psychology. Let's take an example: the low E string of a guitar has a frequency of 82.4 Hz. If you produce a pure sine wave with the same frequency (for example with Audacity), the result will sound artificial and sterile. How do we get the typical sound of an instrument - as for example of a guitar? The keyword is "overtone": every string instrument (guitar, ukulele, mandolin, etc.) produce two different kind of tones: the keynote (thus the tone with the fundamental frequency) and multiple overtones. In addition, it often occurs that overtones are stronger (thus they have a higher amplitude) than the keynote. That's also a reason why frequency detection can be so difficult.

Please take into account that we talk about keynote (or fundamental frequency) when it deals with tuning an instrument (as for example with this iOS app).

One approach for frequency detection is FFT (Fast Fourier Transformation): here we work with the frequency domain (or spectrum) - the peaks can be associated to the frequencies produced by an instrument.

Another approach for frequency detection is autocorrelation: contrary to FFT we work with time domain data. As string instruments produce periodic signals, detecting the period of itself can be an appropriate solution. Within autocorrelation, periods of an incoming signal are marked as a peak. Often, we need a number of periods of data to obtain a reliable estimate about the period and thus about the frequency which is inverse to the period.

* High precision (approximately 0.1 %)
* Large frequency range (22 Hz to 1000 Hz)
* Suitable for bass, guitar, ukulele, mandolin, etc.
* Display of exact frequency (in Hz)
* Gauge view of the detected (semi) tone and octave
* "Tune up/down" (in Hz, marked by up/down arrow)
* Spectral View (FFT)
* Time-Domain View (Autocorrelation)
* "Tuning by ear"
* User Manual
* Available in 11 different languages
* Free user support (English, French, Spanish, Portuguese, Italian, German)

Device Requirements:
* iPhone, iPad, and iPod touch
* Requires iOS 8.0 or later
* 11.3 MB

Pricing and Availability:
Simple Guitar Tuner Pro 1.0 is $1.99 USD (or equivalent amount in other currencies) and is available worldwide exclusively through the App Store in th Music category.

Developer Ulrich Vormbrock and holds both a French and German degree in Telecommunications. With work and project experience of more than 10 years (mainly in the Java and J2EE environment), Ulrich develops apps both for the iPhone and iPad. All Rights Reserved. Apple, the Apple logo, iPhone, iPad and iPod are registered trademarks of Apple Inc. in the U.S. and/or other countries.


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