Speech collector in car cabin
First Claim
1. An apparatus, comprising:
- a first microphone disposed near a first seat in a car cabin, the first seat configured to seat a first occupant;
a second microphone disposed near a second seat in the car cabin, the second seat configured to seat a second occupant;
a processor; and
a memory storing a computer program, whereinthe computer program, when executed, causes the processor to execute operations including;
calculating a first envelope of a signal of the first microphone and a second envelope of a second signal of the second microphone;
detecting a first bottom level of the first envelope and a second bottom level of the second envelope;
setting a first threshold on the basis of the first bottom level and a second threshold on the basis of the second bottom level;
detecting a first speech section in which a level of the first signal is higher than the first threshold and a second speech section in which a level of the second signal is higher than the second threshold;
when one of the first and the second speech sections is detected, estimating a first or a second mixed speech using a second or a first signal acquired by the second or the first microphone, the first and the second mixed speech including a first or a second speech that has been uttered by the second or the first occupant and has entered the first or the second microphone respectively; and
removing the first or the second mixed speech from a first or the second signal acquired by the first or the second microphone.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus includes a first microphone disposed near a first seat in a car cabin, the first seat configured to seat a first occupant, a second microphone disposed near a second seat in the car cabin, the second seat configured to seat a second occupant, a processor, and a memory storing a computer program. The computer program, when executed, causes the processor to execute operations including: estimating a first mixed speech using a second signal acquired by the second microphone, the first mixed speech including a first speech that has been uttered by the second occupant and has entered the first microphone, and removing the first mixed speech from a first signal acquired by the first microphone.
22 Citations
20 Claims
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1. An apparatus, comprising:
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a first microphone disposed near a first seat in a car cabin, the first seat configured to seat a first occupant; a second microphone disposed near a second seat in the car cabin, the second seat configured to seat a second occupant; a processor; and a memory storing a computer program, wherein the computer program, when executed, causes the processor to execute operations including; calculating a first envelope of a signal of the first microphone and a second envelope of a second signal of the second microphone; detecting a first bottom level of the first envelope and a second bottom level of the second envelope; setting a first threshold on the basis of the first bottom level and a second threshold on the basis of the second bottom level; detecting a first speech section in which a level of the first signal is higher than the first threshold and a second speech section in which a level of the second signal is higher than the second threshold; when one of the first and the second speech sections is detected, estimating a first or a second mixed speech using a second or a first signal acquired by the second or the first microphone, the first and the second mixed speech including a first or a second speech that has been uttered by the second or the first occupant and has entered the first or the second microphone respectively; and removing the first or the second mixed speech from a first or the second signal acquired by the first or the second microphone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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acquiring a first signal from a first microphone disposed near a first seat in a car cabin, the first seat configured to seat a first occupant; acquiring a second signal from a second microphone disposed near a second seat in the car cabin, the second seat configured to seat a second occupant; calculating a first envelope of a signal of the first microphone and a second envelope of a second signal of the second microphone; detecting a first bottom level of the first envelope and a second bottom level of the second envelope; setting a first threshold on the basis of the first bottom level and a second threshold on the basis of the second bottom level; detecting a first speech section in which a level of the first signal is higher than the first threshold and a second speech section in which a level of the second signal is higher than the second threshold; when a first or a second speech section is detected, estimating a first or a second mixed speech using the second or the first signal, the first or the second mixed speech including a first or a second speech that has been uttered by the second or the first occupant and has entered the first or the second microphone respectively; and removing the first or the second mixed speech from the first or the second signal. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus, comprising:
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a first microphone disposed near a first seat in a car cabin, the first seat configured to seat a first occupant; a second microphone disposed near a second seat in the car cabin, the second seat configured to seat a second occupant; a processor; and a memory storing a computer program, wherein the computer program, when executed, causes the processor to execute operations including; acquiring a first signal using the first microphone; acquiring a second signal using the second microphone; calculating envelopes of the first and second signals; detecting bottom levels of the envelopes; setting a threshold on the basis of the bottom levels; and determining a section in which levels of the first and second signals are higher than the threshold, as the speech section; determining whether any of the first and second signals includes the speech section; and (1) when it is determined that the first signal includes the speech section, estimating a first mixed speech using the second signal, the first mixed speech including a first speech that has been uttered by the second occupant and has entered the first microphone, and removing the first mixed speech from the first signal; and (2) when it is determined that the second signal includes the speech section, estimating a second mixed speech using the first signal, the second mixed speech including a second speech that has been uttered by the first occupant and has entered the second microphone, and removing the second mixed speech from the second signal. - View Dependent Claims (17, 18, 19, 20)
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Specification