Design and Implementation of Embedded Software and Firmware on LR-BOOK Handheld Device Based on ARM920T Architecture

• Main Authors: Po-HsunChen, 陳柏勳
• Other Authors: Jhing-Fa Wang
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/08213501313083650589

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 98 === This thesis develops a listening and reading book (LR-Book) system with the Samsung ARM920T based S3C2440 fixed-point processor. The LR-Book system is designed to enhance the convenience of reading style for senior people, and it consists of two major parts: firmware design and software design. In the firmware part, to deal with the interaction between complicated application programs and hardware, we port the boot loader, file system, and the Linux 2.6.14 kernel to a prototype development board. In the software design, we integrate the speech synthesis and OCR. We modify the floating-point HTS 1.0.2 speech synthesis engine into fixed-point version. Moreover, two fixed-point mathematical operations of division and exponentiation are specially designed by the Newton-Raphson method and the least squares approximation, respectively. To overcome the problems of snapshot of rotating and shrinking in OCR, we propose a new feature extraction method that utilities the rotation invariant characteristic of a number’s center. According to the experimental results, the fixed-point speech synthesizer is faster 45 times than floating-point HTS_engine_1.0.2, and reaches real-time on the embedded device without Floating Point Units (FPUs). The recognition rate of OCR reaches 89%.