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ChromaticTuner 1.2
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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 |
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| Downloads: | 2325 |
Views: | 27863 |
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Average ratings: | 0/5 (0 rates) |
Download:
ChromaticTuner-1.2.zip (99 KB) 
Description: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.
History:
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
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