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    • 4. 发明授权
    • Acoustic communication system
    • 声通信系统
    • US07505823B1
    • 2009-03-17
    • US09856734
    • 2000-07-31
    • David BartlettScott HommelMichael ReynoldsDavid Alexander ButlerPeter John Kelly
    • David BartlettScott HommelMichael ReynoldsDavid Alexander ButlerPeter John Kelly
    • G06F17/00A63H30/00
    • H04J13/10G10L19/018H04B11/00H04J13/0022
    • 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.
    • 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。
    • 9. 发明授权
    • Determining a position of a tag
    • 确定标签的位置
    • US07932860B2
    • 2011-04-26
    • US12459733
    • 2009-07-07
    • David Bartlett
    • David Bartlett
    • G01S5/04
    • G01S5/0009G01S5/021G01S5/12
    • 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.
    • 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。