| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sound field measuring apparatus and a sound field measuring method, where in the case of driving a speaker by a test signal and measuring the propagation time of a speaker output by applying the sound field measuring apparatus to a car audio apparatus e.g., the propagation time can be surely measured by simple constitution even under a much-noise environment. <P>SOLUTION: The speaker is driven by a burst signal, sound is picked up by a microphone and an output signal from the microphone is filtered by an IIR filter in a time base direction and a direction going back the time base. <P>COPYRIGHT: (C)2007,JPO&INPIT |
