| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of measuring the frequency characteristic of a reproduced sound field in a short period of time. SOLUTION: When the frequency characteristic of the reproduced sound field is measured, relation of a value N to a valueνis set as N≤ν, wherein N is a length of a TSP (Time Stretched Pulse) signal,νis a length of impulse response between a speaker and a microphone, TN is a duration interval of the TSP signal, and each of T1 to T(k+L) is an interval in which an interval TN is a unit (k≥1 and L≥0). The TSP signal is repeatedly supplied to the speaker for each interval TN over T1 to Tk. Output signals of the microphone over T1 to T(k+1) are added and averaged for each interval TN. By performing circulation convolution arithmetic on this averaged value, the frequency characteristics between the speaker and the microphone are obtained. COPYRIGHT: (C)2007,JPO&INPIT
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