Positioning method using music pieces
View Patent ↗A positioning method using music pieces continuously provides positioning service. At each signature burst (i.e., a highly unique short musical segment suitable for positioning), sounds of a music piece are used for positioning. Between signature bursts, dead reckoning (DR) is used.
1. A method for continuously determining a geographic area of said apparatus using sounds of a music piece including first and second signature bursts separated a first non-signature interval and followed by a second non-signature interval, comprising the steps of:
A) determining a first position of said apparatus by an acoustic-positioning (AP) module at said first signature burst by correlating received audio signals and transmitted audio signals;
B) determining locations of said apparatus by using said first position as a first initial location for dead reckoning by a dead-reckoning (DR) module during said first non-signature interval;
C) determining a second position of said apparatus by said AP module at said second signature burst by correlating received audio signals and transmitted audio signals;
D) determining locations of said apparatus by using said second position as a second initial location for dead reckoning by said DR module during said second non-signature interval.
2. The method according to claim 1 , wherein said first or second signature burst has a correlativity higher than a pre-determined value.
3. The method according to claim 2 , wherein the correlativity of a signature burst is the ratio of the peak value and the root-mean-square (rms) value of the auto-correlation function of said signature burst.
4. The method according to claim 1 , further comprising a memory for storing a signature-burst meta-data associated with said music piece.
5. The method according to claim 1 , further comprising a memory for storing content data for said music piece.
6. The method according to claim 1 , wherein said AP module further comprises a signal generator for generating a replica of said transmitted audio signals.
7. The method according to claim 1 , wherein said AP module measures the time-of-flight of said received audio signals with respect to said transmitted audio signals.
8. The method according to claim 1 , wherein said sounds of said music piece are simultaneously generated by at least two sound-transmitting devices.
9. The method according to claim 8 , wherein said AP module measures the time-difference-of-flight of said received audio signals.
10. The method according to claim 1 , wherein said DR module comprises at least an accelerometer, a compass and/or a gyroscope.