Circuit Lake

The purpose of the project is to build uncomplicated voice recognition system based on M32C/84 microcontroller. The main part consists of telephone, some amplifiers, and development board.

The project used to operational amplifiers in the analog part, the first one, provide amplification to the signal of 220mV p-p generated by signal transducer (a microphone electret) [...]

The goal of project is to helps people develop the musical skills of perfect pitch and relative pitch. Push buttons allow the user to navigate a graphical user interface (GUI) on a liquid crystal display (LCD). In perfect pitch training mode, a note is played and the user tries to identify the note on [...]

This ATmega168-based digital comb filter built to clean a realtime audio signal. It can remove the ubiquitous 60Hz (50Hz in some countries) hum noise caused by power lines and household electrical wiring. Since the noise is not strictly sinusoidal it is necessary to remove all harmonics of 60Hz, and that is what this filter does.

This music player project built based on AT90USB1286 microcontroller. It uses VS1033D music decoder which integrates music file decoding and digital-to-analog output. Other main part including 16×2 character LCD display, ST7066/HD44780 compatible, using 3.3V instead of 5V and DS1307 real time clock.
By finishing this project you can understand the communication between the microcontroller, memory, computer, [...]