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STM32CUBEL4 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện STM32CUBEL4
Giải thích chi tiết về linh kiện  STM32CubeL4 demonstration firmware for 32L476GDISCOVERY discovery kit
PDF  37 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32CUBEL4 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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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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