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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32CUBEL4 датащи(PDF) 22 Page - STMicroelectronics |
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STM32CUBEL4 датащи(HTML) 22 Page - STMicroelectronics |
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22 / 37 page  Demonstration functional description UM1919 22/37 DocID028080 Rev 1 4.4.7 Guitar tuner Overview The Guitar tuner module application allows to demonstrate the perfect integration of an acoustic Guitar tuner audio library. It uses the audio recording capability of the digital microphone embedded on the STM32L476G discovery board. Figure 18. Guitar tuner application menu selection and display Status could be any of the following display outputs: • “ “: audio sample invalid. Ensure that STM32L476G discovery board is close to the guitar • “OK“: string in tune • “++“: string needs to be tightened • “+“: string needs to be tightened but close to be in tune • “--“: string is too tightened • “-“: string is too tightened but close to be in tune Features • Standard tuning type of 6 acoustic guitar strings • Input 16-bits PCM data with a sample rate at 8 kHz (mono) • Precision lower than 0.5 Hz • Real time display every 256ms The standard tuning method is based on the following expected frequencies per string: Table 3. Frequencies per string String 1 (Hz) (the thickest string) String 2 (Hz) String 3 (Hz) String 4 (Hz) String 5 (Hz) String 6 (Hz) (the thinnest string) E1 = 82.41 A1 = 110 D2 = 146.83 G2 = 196 B2 = 246.94 E3 = 329.63 |
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