Systems, methods, apparatus, and computer-readable media for head tracking based on recorded sound signals
First Claim
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1. A method of audio signal processing, said method comprising:
- calculating a first cross-correlation between a left microphone signal and a reference microphone signal;
calculating a second cross-correlation between a right microphone signal and the reference microphone signal; and
based on information from the first and second calculated cross-correlations, determining a corresponding orientation of a head of a user,wherein the left microphone signal is based on a signal produced by a left microphone located at a left side of the head, the right microphone signal is based on a signal produced by a right microphone located at a right side of the head opposite to the left side, and the reference microphone signal is based on a signal produced by a reference microphone, andwherein said reference microphone is located such that (A) as the head rotates in a first direction, a left distance between the left microphone and the reference microphone decreases and a right distance between the right microphone and the reference microphone increases and (B) as the head rotates in a second direction opposite to the first direction, the left distance increases and the right distance decreases.
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Abstract
Systems, methods, apparatus, and machine-readable media for detecting head movement based on recorded sound signals are described.
40 Citations
49 Claims
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1. A method of audio signal processing, said method comprising:
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calculating a first cross-correlation between a left microphone signal and a reference microphone signal; calculating a second cross-correlation between a right microphone signal and the reference microphone signal; and based on information from the first and second calculated cross-correlations, determining a corresponding orientation of a head of a user, wherein the left microphone signal is based on a signal produced by a left microphone located at a left side of the head, the right microphone signal is based on a signal produced by a right microphone located at a right side of the head opposite to the left side, and the reference microphone signal is based on a signal produced by a reference microphone, and wherein said reference microphone is located such that (A) as the head rotates in a first direction, a left distance between the left microphone and the reference microphone decreases and a right distance between the right microphone and the reference microphone increases and (B) as the head rotates in a second direction opposite to the first direction, the left distance increases and the right distance decreases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for audio signal processing, said apparatus comprising:
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means for calculating a first cross-correlation between a left microphone signal and a reference microphone signal; means for calculating a second cross-correlation between a right microphone signal and the reference microphone signal; and means for determining a corresponding orientation of a head of a user, based on information from the first and second calculated cross-correlations, wherein the left microphone signal is based on a signal produced by a left microphone located at a left side of the head, the right microphone signal is based on a signal produced by a right microphone located at a right side of the head opposite to the left side, and the reference microphone signal is based on a signal produced by a reference microphone, and wherein said reference microphone is located such that (A) as the head rotates in a first direction, a left distance between the left microphone and the reference microphone decreases and a right distance between the right microphone and the reference microphone increases and (B) as the head rotates in a second direction opposite to the first direction, the left distance increases and the right distance decreases. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An apparatus for audio signal processing, said apparatus comprising:
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a left microphone configured to be located, during use of the apparatus, at a left side of a head of a user; a right microphone configured to be located, during use of the apparatus, at a right side of the head opposite to the left side; a reference microphone configured to be located, during use of the apparatus, such that (A) as the head rotates in a first direction, a left distance between the left microphone and the reference microphone decreases and a right distance between the right microphone and the reference microphone increases and (B) as the head rotates in a second direction opposite to the first direction, the left distance increases and the right distance decreases; a first cross-correlator configured to calculate a first cross-correlation between a reference microphone signal that is based on a signal produced by the reference microphone and a left microphone signal that is based on a signal produced by the left microphone; a second cross-correlator configured to calculate a second cross-correlation between the reference microphone signal and a right microphone signal that is based on a signal produced by the right microphone; and an orientation calculator configured to determine a corresponding orientation of a head of a user, based on information from the first and second calculated cross-correlations. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A non-transitory machine-readable storage medium comprising tangible features that when read by a machine cause the machine to:
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calculate a first cross-correlation between a left microphone signal and a reference microphone signal; calculate a second cross-correlation between a right microphone signal and the reference microphone signal; and determine a corresponding orientation of a head of a user, based on information from the first and second calculated cross-correlations, wherein the left microphone signal is based on a signal produced by a left microphone located at a left side of the head, the right microphone signal is based on a signal produced by a right microphone located at a right side of the head opposite to the left side, and the reference microphone signal is based on a signal produced by a reference microphone, and wherein said reference microphone is located such that (A) as the head rotates in a first direction, a left distance between the left microphone and the reference microphone decreases and a right distance between the right microphone and the reference microphone increases and (B) as the head rotates in a second direction opposite to the first direction, the left distance increases and the right distance decreases.
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Specification