ECTI-CON 2012 is the ninth annual international conference organized by Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI) Association, Thailand. The conference aims to be an international forum for presentation of technological advances and research results in the field of electrical engineering, electronics, computer, telecommunications, and information technology. Accepted papers will be published in the Proceedings of ECTI-CON 2011 and will be available via IEEE Xplore. Acceptance will be based on quality, relevance, and originality.