| 摘要 |
<p>An acoustic analysis device using a reduced scale model comprises a model (30) of a reduced scale of 1/n, a loudspeaker (32) and a microphone (34) provided in the model, a sound signal forming circuit (35) for forming a signal to be radiated by AD-converting an analog signal to be measured at a predetermined sampling frequency, storing the converted signal in a first RAM, reading out the stored signal at a first sampling clock and DA-converting the read out signal, a collected sound reproducing circuit for reproducing collected sound by AD-converting an output signal from the sound collecting device at a second sampling clock, storing the converted signal in a second RAM and reading out the stored signal at a third sampling clock, a sampling clock control circuit (56) for setting the first sampling clock frequency at a value which is n times as high as the predetermined sampling frequency and setting the second sampling clock frequency at a value which is n times as high as the third sampling clock frequency, and an acoustic analysis circuit (80) for acoustically analizing the output of the collected sound reproducing circuit. A frequency conversion device (1) used for the acoustic analysis device comprises the above described sound signal forming circuit, collected sound reproducing circuit and sampling clock control circuit.</p> |
