Sound measuring apparatus and method, and audio signal processing apparatus
First Claim
1. A sound measuring apparatus for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone, the sound measuring apparatus comprising:
- control means for performing control so that the test signal is expanded in a time axis and is then output from the speaker; and
delay time measuring means for measuring an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, thereby obtaining the sound-arrival delay time as the expansion-based measured delay time.
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Abstract
A sound measuring apparatus for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone includes the following elements. A control unit performs control so that the test signal is expanded in a time axis and is then output from the speaker. A delay time measuring unit measures an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, and obtains the sound-arrival delay time as the expansion-based measured delay time.
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Citations
8 Claims
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1. A sound measuring apparatus for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone, the sound measuring apparatus comprising:
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control means for performing control so that the test signal is expanded in a time axis and is then output from the speaker; and
delay time measuring means for measuring an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, thereby obtaining the sound-arrival delay time as the expansion-based measured delay time. - View Dependent Claims (2, 3, 4)
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5. A sound measuring method for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone, the sound measuring method comprising the steps of:
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expanding the test signal in a time axis and outputting the expanded test signal from the speaker; and
measuring an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, thereby obtaining the sound-arrival delay time as the expansion-based measured delay time.
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6. An audio signal processing apparatus having a sound measuring function for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone, the audio signal processing apparatus comprising:
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control means for performing control so that the test signal is expanded in a time axis and is then output from the speaker;
delay time measuring means for measuring an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, thereby obtaining the sound-arrival delay time as the expansion-based measured delay time; and
delay time adjusting means for adjusting a delay time of an audio signal to be output from the speaker according to the sound-arrival delay time obtained by the delay time measuring means.
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7. A sound measuring apparatus for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone, the sound measuring apparatus comprising:
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a control unit that performs control so that the test signal is expanded in a time axis and is then output from the speaker; and
a delay time measuring unit that measures an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, thereby obtaining the sound-arrival delay time as the expansion-based measured delay time.
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8. An audio signal processing apparatus having a sound measuring function for measuring a sound-arrival delay time from a speaker to a microphone on the basis of a result obtained by outputting a test signal from the speaker and picking up the test signal using the microphone, the audio signal processing apparatus comprising:
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a control unit that performs control so that the test signal is expanded in a time axis and is then output from the speaker;
a delay time measuring unit that measures an expansion-based measured delay time on the basis of a delay time that is measured on the basis of a time difference between the test signal expanded in the time axis and output from the speaker and a signal obtained from the microphone by picking up the output expanded test signal, thereby obtaining the sound-arrival delay time as the expansion-based measured delay time; and
a delay time adjusting unit that adjusts a delay time of an audio signal to be output from the speaker according to the sound-arrival delay time obtained by the delay time measuring unit.
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Specification