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。