Method and device for measuring sound wave propagation time between loudspeaker and microphone
AssigneesTOA Corporation, Etani Electronics Co., Ltd.
InventorsDaisuke Higashihara, Shokichiro Hino, Koichi Tsuchiya, Tomohiko Endo
Life of this patent
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Abstract
A device 1 for measuring a propagation time of a sound wave comprises a sound source means 11 and a calculation means 12. The sound source means 11 outputs a time stretched pulse as a sound source signal input to a speaker 3. The calculation means 12 calculates a cross-correlation function of the time stretched pulse and the sound signal which is output from the speaker 3 and is received in a microphone 4. Based on the cross-correlation function, the propagation time of the sound wave between the speaker 3 and the microphone 4 is found.
Claims8
A method of measuring a propagation time of a sound wave between a speaker and a microphone, comprising:
- a first step of outputting a time stretched pulse from the speaker;
- a second step of receiving a sound signal output from the speaker in the microphone and taking in the received sound signal from the microphone;
- and
- a third step of calculating a cross-correlation function of the time stretched pulse and the received sound signal taken in the second step, wherein
- the propagation time of the sound wave between the speaker and the microphone is found based on the cross-correlation function.
A device for measuring a propagation time of a sound wave between a speaker and a microphone, comprising:
- a sound source means;
- and
- a calculation means, wherein
- the sound source means is configured to output a time stretched pulse as a sound source signal input to the speaker, and
- the calculation means is configured to take in, from the microphone, a sound signal which is output from the speaker and is received in the microphone, and to calculate a cross-correlation function of the time stretched pulse and the received sound signal taken in, and to find the propagation time of the sound wave between the speaker and the microphone, based on the cross-correlation function.
Dependencies are inferred from the claim text.