Implementation of speech recognition on a microcontroller for controlling wheelchair | |
| Author | Thiang |
| Call Number | AIT Thesis no.ISE-06-45 |
| Subject(s) | Wheelchairs Programmable controllers |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Mechatronics, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ISE-06-45 |
| Abstract | A motorized wheelchair usually uses a joystick as the input interface for controlling movement of the wheelchair. In this thesis, instead of the joystick, speech signal of some words are used to control movement of the wheelchair. In order to achieve that aim, a speech recognition system has been implemented on A TMEL A T89C51 RC microcontroller. There are two approaches used to recognize the speech signal. The first approach is Linear Predictive Coding (LPC) combined with Euclidean Squared Distance. LPC is used as the feature extraction method and Euclidean squared Distance is used as the recognition method. The second approach is Hidden Markov Model (HMM), which is used to build reference model of the words and also used as the recognition method. Feature extraction method used in the second approach is a simple segmentation and centroid value. Both approaches work on time domain. The wheelchair movement is actuated by using two DC motors. Both DC motors are controlled by using A TMEL A T89C52 microcontroller. A simple open loop control system is implemented to control the speed of DC motor. Experiments were done to analyze performance of both approaches. Each approach has advantages and disadvantages. The highest average recognition rate that can be achieved using LPC-Euclidean Squared Distance approach was 78.57%. The highest average recognition rate that can be achieved using HMM-Segmentation and Centroid approach was only 32.86% |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ISE-06-45 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Industrial Systems Engineering (ISE) |
| Chairperson(s) | Manukid Parnichkun; |
| Examination Committee(s) | Afzulpurkar, Nitin V.;Bohez, Erik L. J.; |
| Scholarship Donor(s) | Petra Christian University;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |