2．系統(tǒng)構成與原理
R88D-UP08V語音識別主要包括兩個階段：訓練階段和識別階段。在訓練或識別過程中，都必須對輸入語音進行預處理和特征提取。訓練階段通過用戶輸入的若干次訓練語音，經過預處理和特征提取后得到特征參數(shù)，最后通過特征參數(shù)建模，進而建立訓練語音的參考模型庫。而識別階段是將輸入語音的特征矢量參數(shù)和參考模型庫中的參考模型進行相似性度量，然后把相似度最高的輸入特征矢量作為識別結果輸出，從而達到語音識別目的，如圖1所示。
R88D-UP08V語音識別技術可分為：特定人識別和非特定人識別兩種。特定人識別是指需要對待識別人的語音進行采集訓練，識別對象為專門的人；非特定人識別是指識別對象為大多數(shù)用戶，一般要采集多個人的語音進行錄音、訓練和學習，從而達到較高的識別率。
R88D-UP08V在實際應用中，現(xiàn)代技術開發(fā)嵌入式語音識別有兩種實現(xiàn)方式：調入嵌入式語音開發(fā)包和外擴語音識別芯片。本文的語音識別系統(tǒng)方案是以嵌入式處理器S3C2440為核心，外擴非特定人語音識別芯片LD3320，并將超聲波測距模塊和云臺相結合作為系統(tǒng)的機械執(zhí)行機構。系統(tǒng)測量過程如下：首先根據(jù)語音指令控制兩自由度云臺的位姿，使超聲波探測器指向特定方向，然后開啟超聲波探測器，測量出前方障礙物距離，最后將測量結果轉化為可以播放的二進制數(shù)據(jù)流，通過LD3320的播放功能完成數(shù)據(jù)的播放。
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R88D-UP08V
R88D-UP12HA AC200V 400W
R88D-UP12LA AC100V 200W
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R88D-UP15LA AC100V 300W
R88D-UP20HA AC200V 750W
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R88D-WTA3H
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R88M-H05030 AC50W
R88M-H10030 AC100W
R88M-H10030-B AC100W
R88M-H1K130 AC1100W
R88M-H1K130-B AC1100W
R88M-H20030 AC200W
R88M-H20030-B AC200W
R88M-H20030-G25BJS1
R88M-H30030 AC300W
R88M-H30030-B AC300W
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R88M-U03030HA-B
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Applied Materials PRODUCER 200MM SST LID KIT H2O RETRO FIT 0242-11877
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APPLIED MATERIALS (AMAT) BELLOWS 0040-39066
