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ChromaticTuner 1.2
ChromaticTuner is a lightweight audio tuner that allows you to tune your guitar, voice or any musical instrument from 80 Hz to 800 Hz.

Code size:7 kB text, 10 kB data, 24 kB bss Author:pflooo
Source files included:yes Version:1.2
Use circleOS:yes (1.7) Creation date:2009-06-25 21:45:55
Hardware modification:no Modification date:2009-06-25 21:45:55
Based on the STM32 Primer:Primer2
Downloads:2205 Views:23677
Average ratings:0/5 (0 rates)

Download: (99 KB)


The ChromaticTuner application was developed for the 2009 STM32 Primer2 contest. It demonstrates the STM32 Cortex-M3 signal processing capabilities.

16 bits audio samples are captured from the STw5094A audio codec at 16kHz. A sub-sampling pass (x1 to x32) is done to adapt the targeted frequency accuracy. Thanks to the STM32F10x DSP library, samples are processed with a real-time 4-radix complex FFT (1024 points). Once the fundamental frequency is extracted, the corresponding note and the accuracy is displayed on a vu-meter.

By clicking on the 'scope' toolbar ChromaticTuner is able to display to screen the captured audio graph (time domain) and it's real-time spectrum (frequency domain).

A short help is available clicking the 'info' button.


1.0 : initial revision

1.1 : changed the FFT to a 1024 points one to improve the measured frequency accuracy to 1 Hz

1.2 : cleaned code, fixed bugs