Headtracking system
First Claim
Patent Images
1. A system for tracking of a head comprising:
- a signal generator for generating a test signal;
a first loudspeaker that receives the test signal and generates and radiates a first acoustical test signal;
first and second audio receivers arranged spatially separated at the head to be tracked for receiving the acoustical test signal and providing first and second electrical measurement signals indicative thereof, respectively; and
an evaluation circuit that receives and processes the first and second electrical measurement signals and determines the position and angle of rotation φ
from the first and second measurement signals, where the evaluation circuit is adapted to perform, in the frequency domain, a cross power spectrum operation of the test signal and the first and second electrical measurement signals from the receivers.
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Abstract
System and method for tracking of a head comprising generating and radiating at least one acoustical test signal; receiving the radiated acoustical test signal(s) at two locations at the head under investigation and generating electrical measurement signals therefrom; and evaluating the two measurement signals for determining the position and/or angle of rotation φ from the measurement signals; the evaluation step comprises a cross power spectrum operation of the test signal(s) and the signals from the receivers in the frequency domain.
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Citations
32 Claims
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1. A system for tracking of a head comprising:
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a signal generator for generating a test signal; a first loudspeaker that receives the test signal and generates and radiates a first acoustical test signal; first and second audio receivers arranged spatially separated at the head to be tracked for receiving the acoustical test signal and providing first and second electrical measurement signals indicative thereof, respectively; and an evaluation circuit that receives and processes the first and second electrical measurement signals and determines the position and angle of rotation φ
from the first and second measurement signals, where the evaluation circuit is adapted to perform, in the frequency domain, a cross power spectrum operation of the test signal and the first and second electrical measurement signals from the receivers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for tracking of a head of an occupant in a passenger compartment of a motor vehicle comprising:
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radiating at least one acoustical test signal; receiving the radiated acoustical test signal(s) at two locations at the head of the occupant under investigation and generating first and second electrical measurement signals indicative thereof; and evaluating the first and second measurement signals to determine the position and/or angle of rotation φ
of the head of the occupant by computing a cross power spectrum operation of the test signal and the first and second electrical measurement in the frequency domain. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An audio system with headphones supplied with a signal from a sound processor for adapting the sound of an input sound signal to the position of a head wearing the headphones, the sound processor being controlled by control signals for tracking of the head, the unit for tracking of a head comprises:
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a sound signal generator for generating an electrical test signal; at least one transmitter supplied with a test signal for generating therefrom and radiating an acoustical test signal; two receivers arranged at the head to be tracked for receiving an acoustical measurement signal which includes the acoustical test signal from the transmitter and providing an electrical measurement signal; and an evaluation circuit connected upstream of the two receivers for determining the position and/or angle of rotation φ
from the measurement signals, where the evaluation circuit is adapted to perform, in the frequency domain, a cross power spectrum operation of the test signal(s) and the signals from the receivers.
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Specification