Strobe tuner software software#
I have tested the hardware and software with a Les-Paul-style electrical guitar and it works great. Maybe it works on Teensy 3.2 with some modifications. The software has successfully been tested on Teensy 3.6 and it seems to not work on Teensy 3.2. The RCLK and SRCLK are used to shift the bit in the shift register with a frequency of 16 (= number of LEDs) times the tuning frequency. From this frequency the most likely string of a guitar is guessed and the tuning frequency is set to the value corresponding to the string. The software measures the fundamental frequency of the incoming frequency using the YIN algorithm. It uses the Teensy Audio Library and the audio blocks were wired using Audio System Design Tool for Teensy Audio Library. The software for the Teensy 3.6 development board was written using PlatformIO. It contains a non-inverting amplifier with gain 2 and offset of 0.6 V. For this purpose an implementation of the YIN algorithm for Teensy Audio Library is used.įor the input of the guitar signal a home-made board is used. The Teensy board is also used for detection of the plucked string. To control the shift registers and as a frequency reference a Teensy 3.6 development board is used. The outputs of the shift registers are connected to 16 LEDs soldered in one row (they may also be soldered in a circular pattern). The one is shifted through the buffer with the desired tuning frequency. Instead of a rotating disc two SN74HC595 shift registers are used as a ring buffer shifting a single one through its sixteen bits. Strobe tuners allow for a much higher accuracy than tuners based on autocorrelation etc. If the instrument is out of tune, the pattern seems to rotate clockwise or counter-clockwise depending on the sign of the frequency difference between instrument and reference. The StroboPLUS HDC encompasses decades of tuning authority and technology to deliver the ultimate strobe tuner/metronome combo The StroboPLUS HDC’s 0.1 cent tuning accuracy will tune any instrument with the utmost precision. The disc has a regular pattern on it which seems to be standing still if the instrument is in tune. Since 1948, Peterson Strobe Tuners have defined the standard in tuning accuracy. The strobe is used to illuminate a disc which rotates at the desired tuning frequency. A strobe tuner uses a strobe triggered by the positive or negative half-wave of a musical instrument signal. In this project I built a guitar tuner similar to a strobe tuner.
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