Acoustic robust synchronization signaling for acoustic positioning system
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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Abstract
A position detection system comprising positional element and positioning device, wherein the positional element transmits a continuously modulated acoustic waveform and a synchronization signal that is a sequence of at least two synchronization packets, each bearing timing data for the continuously modulated acoustic waveform. Additionally, the synchronization signal uses time hopping to support concurrent positioning of a plurality of positional elements.
113 Citations
64 Claims
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1. A position detection system for use in association with computing applications, said position detection system comprising:
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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, and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 46)
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33. A position detection method for measuring a position of a positional element by a positioning device, said method comprising the steps of:
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providing a first clock at the positional element; emitting a substantially continuously modulated acoustic waveform at said position of said positional element, said waveform synchronized with said first clock and decodable to fix said position, emitting a synchronization signal at said position of said positional element, 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, 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 timing data synchronized with said first clock; providing a second clock at said positioning device; receiving said acoustic waveform by said positioning device, via 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; receiving said synchronization signal by said positioning device, deriving clock synchronization data from said synchronization signal by correlating said timing data and said time frame being known to said positioning device; synchronizing said second clock with said first clock by said positioning device according to said clock synchronization data; and computing said position of said positional device using said timing data and acoustic waveform. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A position detection system for use in association with computing applications, the system comprising:
- a positional element for attaining a position and comprising a first emitter and a second emitter each for emitting a continuously modulated acoustic waveform decodable to fix said position, the emitters being a predetermined distance apart, said two emitters sending orthogonal codes; and
a detector arrangement for detecting said waveforms in a manner permitting fixing of said position and permitting determination of an attitude of said positional element, the detector arrangement further being operable to output said waveforms for computation, in a manner retentive of said position fixing ability; said positional element further comprising a third emitter for emitting a synchronization signal; said detector arrangement further comprising an additional 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 and respective pressure data; and said detector arrangement being operative to estimate a virtual straight line connecting said first emitter, said second emitter and a virtual point on a screen associated with said computing application wherein 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.
- a positional element for attaining a position and comprising a first emitter and a second emitter each for emitting a continuously modulated acoustic waveform decodable to fix said position, the emitters being a predetermined distance apart, said two emitters sending orthogonal codes; and
Specification