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    • 5. 发明授权
    • Apparatus and method for vehicle navigation
    • US06941220B2
    • 2005-09-06
    • US09954618
    • 2001-09-11
    • Kiem Tinh LeVictor Vega LlanaChristopher OhrenSon Hai BachDac H. Nguyen
    • Kiem Tinh LeVictor Vega LlanaChristopher OhrenSon Hai BachDac H. Nguyen
    • G01S19/48G01C21/26G01C21/36G06F15/50
    • G01C21/3629G01C21/3655
    • A navigation aide device is disclosed that is capable of conveying traveling instructions to a user in possession of the device to allow the user to navigate from a predetermined source position on a predetermined road map, containing road information, to a predetermined destination position on the map, along an optimal road route, under control of travel instructions spoken by the device. Preferably the device includes a position sensor for sensing position of the device and reporting that position, a text to speech converter, a sound conveying device (such as a speaker and associated amplifier) operably connected to the text to speech converter for conveying speech to the user. The device further includes memory for storing a predetermined road map containing road information and a controller. The controller is operably connected to the position sensor, text to speech converter and map memory. The controller calculates an optimal road route between the source position and the destination position, generates a series of text road travel instructions that describe the optimal route in terms of associated road information, receives the report of position by the position sensor during travel, calculates the speed of the device and its direction of travel from the positions reported by the position sensor and determines the road map position corresponding to the reported position based on the position reported, the calculated speed, the calculated direction of travel and the road information. The controller also conveys the series of text road instructions to the text to speech converter. Based on the road map position determined, the controller causes the text to speech converter to convey to the sound conveying device each of the series of text road instructions at a time before the travel has reached the map position corresponding to the particular text road instruction such that the user hears relevant road travel instructions in substantially a timely manner.
    • 6. 发明授权
    • Reader for use in a radio frequency identification system and method thereof
    • 用于射频识别系统的读取器及其方法
    • US06362738B1
    • 2002-03-26
    • US09391725
    • 1999-09-08
    • Victor Vega
    • Victor Vega
    • G08B1314
    • G06K19/07788G06K7/0008G06K7/10069G06K7/10326G06K19/0701G06K19/0723G08B13/2417
    • A contactless programmable electrostatic Radio Frequency Identification (RFID) reader that also serves as an Electronic Article Surveillance (EAS) reader is described. The RFID/EAS reader contains a detector circuit for detecting the presence of a signal carrier frequency transmitted by the transponder in response to a signal from the reader. The detector circuit has a resonator circuit which is connected to a receiver electrode. The resonator comprises a piezoelectric element with a high quality factor ‘Q’ at the resonant frequency to enhance sensitivity. The alarm carrier signal is rectified and fed to either a peak detector or an envelope detector circuit. A voltage source generates a voltage threshold to allow for operating range adjustment. A comparator compares both voltages and generates an alarm signal if the voltage signal reaches the threshold voltage. The RFID/EAS further having the capability to read the RFID contents. Alternatively, an electrostatic EAS reader (without RFID capability) having a substantially similar detector circuit is also described.
    • 描述了同时用作电子物品监视(EAS)阅读器的非接触式可编程静电射频识别(RFID)读取器。 RFID / EAS读取器包含检测器电路,用于响应于来自读取器的信号来检测由应答器发送的信号载波频率的存在。 检测器电路具有连接到接收器电极的谐振器电路。 谐振器包括在谐振频率处具有高质量因子“Q”的压电元件以增强灵敏度,报警载波信号被整流并馈送到峰值检测器或包络检测器电路中,电压源产生电压阈值以允许 对于工作范围调整,比较器比较两个电压,并且如果电压信号达到阈值电压,则产生报警信号,RFID / EAS还具有读取RFID内容的能力,或者,具有静电EAS读取器(无RFID能力)具有 还描述了基本类似的检测器电路。