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29 条记录 (耗时 0.021 秒)

    Acoustic communication system
    4.
    发明授权
    Acoustic communication system 有权
    声通信系统

    公开(公告)号：US07505823B1

    公开(公告)日：2009-03-17

    申请号：US09856734

    申请日：2000-07-31

    申请人： David Bartlett ,  Scott Hommel ,  Michael Reynolds ,  David Alexander Butler ,  Peter John Kelly

    发明人： David Bartlett ,  Scott Hommel ,  Michael Reynolds ,  David Alexander Butler ,  Peter John Kelly

    IPC分类号： G06F17/00 ,  A63H30/00

    CPC分类号： H04J13/10 ,  G10L19/018 ,  H04B11/00 ,  H04J13/0022

    摘要： A signalling system is provided which can be used to update the prices of goods which are electronically displayed on supermarket shelves (1). The signalling system comprises a first signalling device having an input terminal for receiving electrical message data received from a central computer system (5), a spread spectrum encoder for encoding the received message data and an electroacoustic converter (11) for converting the encoded data into corresponding acoustic signals and for transmitting the acoustic signals into a transmission medium. The signalling system also comprises a second signalling device (3) having means for receiving acoustic signals from said transmission medium and for converting the received acoustic signals into corresponding electrical signals, a spread spectrum decoder for decoding the received signals and a message regenerator for regenerating the message data transmitted by the first signalling device from the signals output by the decoder.

    摘要翻译： 描述了一种玩具系统，其中使用扩频技术对数据信号进行编码，以形成扩展信号，该扩展信号与音频轨道组合以形成修改的音轨。 然后将经修改的音轨作为声信号发送到具有用于将声信号转换成电信号的电声换能器的玩具，该电信号然后被解扩以再生数据信号，并且玩具响应数据信号。 通过使用扩展频谱技术在宽频率范围内扩展数据信号，修改后的音轨中的扩展信号可以实际上听不到听众的听觉。 所描述的技术与玩具系统以外的声学通信系统相关。

    Robust fractional clock-based pulse generator for digital pulse width modulator
    7.
    发明授权
    Robust fractional clock-based pulse generator for digital pulse width modulator 有权

    公开(公告)号：US06819190B2

    公开(公告)日：2004-11-16

    申请号：US10315836

    申请日：2002-12-10

    申请人： Lawrence G. Pearce ,  William David Bartlett

    发明人： Lawrence G. Pearce ,  William David Bartlett

    IPC分类号： H03B2700

    CPC分类号： H03L7/0805 ,  H03K5/06 ,  H03K7/08 ,  H03L7/0812

    摘要： A tapped delay line generates a fractional clock pulse signal for controlling a PWM pulse generator, such as used in a DC-DC converter. Operational parameters of the tapped delay are adjusted to maintain a desired fractional precision of the duty-cycle of the PWM clock pulse signal. In a first, phase locked loop (PLL) based embodiment, the tapped delay line-based digital PWM pulse generator includes a compensating phase locked-loop formed around an auxiliary tapped delay line that implements the voltage controlled oscillator of the PLL. In a second embodiment, the PWM pulse generator is configured as an ‘open-loop’ tapped delay line phase detector architecture, which avoids having to correlate parameters of the PLL delay line with those of the PWM delay line.

    Loop data link
    8.
    发明授权
    Loop data link 失效
    循环数据链接

    公开(公告)号：US4714925A

    公开(公告)日：1987-12-22

    申请号：US811479

    申请日：1985-12-20

    申请人： David Bartlett

    发明人： David Bartlett

    IPC分类号： G07C5/00 ,  G08G1/01 ,  G08G1/042 ,  G08G1/0967 ,  H04Q7/00 ,  G07B15/02

    CPC分类号： G08G1/096716 ,  G07C5/008 ,  G08G1/017 ,  G08G1/042 ,  G08G1/096758 ,  G08G1/096775 ,  G08G1/096783

    摘要： Data stored in a logger is transmitted from a vehicle by a responder. The data is received by a transceiver and stored in a device. Data can also be transferred in the reverse direction. An inductive loop is used to sense the presence of the vehicle and, when the vehicle is sensed, to initiate an interrogation of the vehicle. Data transfer takes place only if the vehicle is identified.

    摘要翻译： 存储在记录器中的数据由响应者从车辆发送。 数据由收发器接收并存储在设备中。 数据也可以相反的方向传输。 感应回路用于感测车辆的存在，并且当感测到车辆时，开始询问车辆。 仅当车辆被识别时才会进行数据传输。

    Determining a position of a tag
    9.
    发明授权
    Determining a position of a tag 有权
    确定标签的位置

    公开(公告)号：US07932860B2

    公开(公告)日：2011-04-26

    申请号：US12459733

    申请日：2009-07-07

    申请人： David Bartlett

    发明人： David Bartlett

    IPC分类号： G01S5/04

    CPC分类号： G01S5/0009 ,  G01S5/021 ,  G01S5/12

    摘要： A tag transmits signals having at least two different frequency components. The signals are receivable by at least some of a plurality of spaced receivers. Each receiver, in response to receiving a signal, measures respective phases of the first and second frequency components and a frequency offset between the tag and the receiver. The frequency offset is dependent upon a difference in frequencies of respective clocks in the tag and the receiver. A position processor obtains a difference in phases of the first and second frequency components for a signal, a frequency offset between the receiver and tag and determines the position of the tag in dependence upon the difference between respective phases of the first and second frequency components and in dependence upon the frequency offset.

    摘要翻译： 标签发送具有至少两个不同频率分量的信号。 信号可由多个间隔接收器中的至少一些接收。 响应于接收信号，每个接收机测量第一和第二频率分量的各个相位以及标签与接收机之间的频率偏移。 频率偏移取决于标签和接收机中各个时钟频率的差异。 位置处理器获得信号的第一和第二频率分量的相位差，接收机和标签之间的频率偏移，并且根据第一和第二频率分量的各个相位之间的差确定标签的位置，以及 取决于频偏。

    Tag tracking
    10.
    发明授权
    Tag tracking 失效
    标签跟踪

    公开(公告)号：US07228228B2

    公开(公告)日：2007-06-05

    申请号：US10416804

    申请日：2001-11-14

    申请人： David Bartlett ,  Michael Reynolds ,  Paul Smith ,  Nicolas Vasilopoulos ,  Peter Duffett-Smith

    发明人： David Bartlett ,  Michael Reynolds ,  Paul Smith ,  Nicolas Vasilopoulos ,  Peter Duffett-Smith

    IPC分类号： G06F19/00

    CPC分类号： G01S5/021 ,  G01S1/08 ,  G01S5/0226 ,  G01S5/14 ,  G01S11/02

    摘要： The present invention provides a tracking system in which a mobile tag having an unknown position, which tag is to be tracked in space over time, transmits a signal comprising a pair of tones at different frequencies. The transmitted signal is received at each of three receivers, each having a known location, where the phase of each of the tones within the signal is measured. The measured phases are passed to a processing unit which determines the position of the tag at the time of transmission of the signal on the basis of the difference between the measured phases of the two tones. The tracking system operates over a defined finite range to track the position of the mobile tag uniquely in space.

    摘要翻译： 本发明提供了一种跟踪系统，其中具有未知位置的移动标签，该标签将随着时间在空间中跟踪，发送包括不同频率的一对音调的信号。 发送的信号在三个接收机中的每一个接收，每个接收机具有已知位置，其中测量信号内每个音调的相位。 测量的相位被传递到处理单元，该处理单元基于两个音调的测量相位之间的差来确定在信号发送时标签的位置。 跟踪系统在限定的有限范围内运行，以在空间中唯一地跟踪移动标签的位置。