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Acoustic robust synchronization signaling for acoustic positioning system

  • US 7,852,318 B2
  • Filed: 05/17/2005
  • Issued: 12/14/2010
  • Est. Priority Date: 05/17/2004
  • Status: Expired due to Fees
First Claim
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1. A position detection system for use in association with computing applications, said position detection system comprising:

  • at least one positional element for attaining a position, said positional element comprising;

    at least one first emitter for emitting a substantially continuously modulated acoustic waveform decodable to fix said position, anda second emitter for emitting a synchronization signal;

    a positioning device operative to determine a position of said positional element, said positioning device comprising;

    an arrangement of at least one of a first detector operative to detect said continuously modulated acoustic waveform in a manner permitting fixing of said position and outputting said waveform for computation, in a manner retentive of said position fixing ability; and

    a second detector operative to detect said synchronization signal;

    said synchronization signal being transmitted within a time frame having a fixed duration and being continuously repeated, said time frame being known to said positioning device, said synchronization signal being a sequence of at least two synchronization sub-signals, each synchronization sub-signal bearing timing data for said continuously modulated acoustic waveform, thereby to improve accuracy of said fixing of said position, said at least two synchronization sub-signals allow said positioning device to derive clock synchronization data by correlating said timing data and said known time frame duration.

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