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Research on Embedded Speech Recognition System Applied in Robot

Author: LiuGuiBin
Tutor: JiYouFang
School: China University of Petroleum
Course: Applied Computer Technology
Keywords: Speech recognition DHMM Embedded Systems Mobile robot PXA270
CLC: TN912.34
Type: Master's thesis
Year: 2009
Downloads: 238
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Abstract


The voice recognition technology to identify and understand the speech signal into the appropriate text or control command technology is to make the robot . Speech recognition is an interdisciplinary , is gradually becoming the key technology of information technology in human-computer interaction , a combination of speech recognition and speech synthesis technology , so that people can be more convenient to operate the robot via voice commands . Is the easiest way to achieve human-computer interaction via voice , voice control and the use of the professional level of the operating personnel is also greatly reduced ; addition , to make the robot has human intelligence , language communication between man and machine is essential . Therefore , to carry out the work of the voice-controlled study has practical significance and application prospects . The main work of this paper include the following points: First, the speech recognition basics and commonly used in speech recognition algorithm , include: voice signal pre-processing , noise suppression , endpoint detection , feature extraction , DTW and HMM recognition algorithm ; Second, the voice signal processing , with voice endpoint detection based on the short-term average and double zero crossing rate threshold law ; using fully consider the characteristics of human auditory Mel frequency cepstrum feature vector as the voice signal ; using based on adaptive threshold wavelet packet transform denoising speech signal denoising. In addition, the speech recognition model using discrete hidden Markov model (DHMM), the use of forward - backward algorithm , Viterbi algorithm and evolutionary Baum-Welch estimation algorithm to accomplish the task of voice training and voice recognition template ; Third , according to the embedded the characteristics of the type system and subject to the requirements to achieve the function , given the overall system hardware and software implementations . Intel's PXA270 microprocessor as the core chip of the embedded system , voice control of mobile robots ; Finally, experimental verification of embedded speech recognition system to test voice recognition rate and stability under different conditions ; voice analysis, control testing and performance testing of the mobile robot system to further verify the feasibility and effectiveness of the improved recognition algorithms .

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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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