DISTANCE MEASUREMENT
First Claim
1. A method of determining a distance between a device and an object, the method comprising:
- emitting an acoustic reference signal from a speaker of the device;
receiving an acoustic input signal at a microphone of the device, the acoustic input signal including a measurement portion including a reflection of the acoustic reference signal off the object;
cross correlating at least the measurement portion with the emitted acoustic reference signal to provide a cross correlated signal;
receiving information relating to the object;
extracting a section of the signal corresponding to reflection of the acoustic reference signal by the object, based on the received information;
analysing the extracted section of the cross correlated signal to determine a time of flight between emitting the acoustic reference signal and receiving the reflection; and
determining the distance between the device and the object based on the determined time of flight and known characteristics of the acoustic reference signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for determining a distance between a device and an object, the method comprising: emitting an acoustic reference signal from a speaker of the device; receiving an acoustic input signal at a microphone of the device, the acoustic input signal including a measurement portion including a reflection of the acoustic reference signal off the object; cross correlating at least the measurement portion with the emitted acoustic reference signal to provide a cross correlated signal; receiving information relating to the object; extracting a section of the cross correlated signal corresponding to reflection of the acoustic reference signal by the object, based on the received information; analysing the extracted section of the cross correlated signal to determine a time of flight between emitting the acoustic reference signal and receiving the reflection; and determining the distance between the device and the object based on the determined time of flight and known characteristics of the acoustic reference signal. A chipset for performing the method is also disclosed.
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Citations
15 Claims
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1. A method of determining a distance between a device and an object, the method comprising:
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emitting an acoustic reference signal from a speaker of the device; receiving an acoustic input signal at a microphone of the device, the acoustic input signal including a measurement portion including a reflection of the acoustic reference signal off the object; cross correlating at least the measurement portion with the emitted acoustic reference signal to provide a cross correlated signal; receiving information relating to the object; extracting a section of the signal corresponding to reflection of the acoustic reference signal by the object, based on the received information; analysing the extracted section of the cross correlated signal to determine a time of flight between emitting the acoustic reference signal and receiving the reflection; and determining the distance between the device and the object based on the determined time of flight and known characteristics of the acoustic reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification