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Hardware and Software Platform Design of Embedded Speech Recognition System

Author: WangYuHong
Tutor: ZhangXueYing
School: Taiyuan University of Technology
Course: Signal and Information Processing
Keywords: embedded system OMAP speech recognition Linux DSP Gateway
CLC: TN912.34
Type: Master's thesis
Year: 2009
Downloads: 77
Quote: 1
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Abstract


Practical research of automatic speech recognition system is a main direction of speech recognition in recent years. With the rapid development of computer technology and communication technology, speech recognition system turns to embedded device from PC platform. Due to limitation of the cost and volume in embedded systems, it must have a highly integrated hardware and software platform.OMAP5912 processor is a dual-core application processor which consists of TMS320C55X DSP core widely used by TI and enhanced ARM926EJ-S microprocessor with low consumption. It also can make designer enjoy the biggest advantage of two processors by optimizing the communication mechanism of processors.Taking embedded speech recognition for research background, using dual-core processor OMAP5912 as the core, this paper builds hardware and software platform of embedded speech recognition system. In the design of hardware platform, this paper expounds design process and principle of system power, decoding circuit, memory unit, audio interface unit, peripheral communication interface unit, display unit, keyboard input unit, simulation unit and spare interface unit. In the memory unit design, this paper introduces DDR SDRAM design, NOR FLASH design, NAND FLASH design and CF card interface design. In the peripheral communication interface unit design, this paper introduces Ethernet interface design, USB master-slave interface design and RS232 interface design. Considering that signal integrity problems are important to high frequency circuit design, this paper elaborates signal integrity design of circuit diagram and PCB during hardware platform design process and separately describes signal integrity design of DDR SDRAM. Finally, this paper briefly introduces testing process of hardware platform. Hardware platform design is the core research content in this paper.In the design of the software platform, this paper introduces compiling process of U-boot 1.1.6 and Linux 2.6.25 kernel and making process of JFFS2 root filesystem using Busybox in sequence. Finally, this paper introduces deployment process from software platform to hardware platform.Whether embedded speech recognition system can normally work, block data exchange between dual-core processors is the key. This paper at last expounds work principle and application process of open source software DSP Gateway which was developed by Nokia Company and specially transmits block data between OMAP dual-core processors.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing > Speech Recognition and equipment
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