1. Arduino board, http://www.arduino.cc (last viewed February 2011)
2. Atmel corporation web side, http://www.atmel.com (last viewed February 2011)
3. Aliev, R.: Soft Computing and its Applications. World Scientific Publishing Company, Singapore (2001)
4. Barbancho, A.M., Barbancho, I., Fernandez, J., Tardón, L.J.: Polyphony number estimator for piano recordings using different spectral patterns. In: 128th Audio Engineering Society Convention (AES 2010), London, UK (2010)
5. Barbancho, A.M., Tardón, L., Barbancho, I.: CDMA systems physical function level simulation. In: IASTED International Conference on Advances in Communication, Rodas, Greece (2001)