1984 年 40 巻 6 号 p. 381-387
This paper describes the stability of the pulse discharge sound source proposed in the previous paper for acoustical measurements. The sound source is ascertained to have stable characteristics which are necessary for acoustic measurements. And it is also ascertained that the power spectrum of the sound pulse has no zero point over wide frequency range. That is, the sound source can be used for the cross spectral estimation of transfer function. The measurement of acoustic field characteristics can be carried out in a usual room selecting the points of source and receiver, since the duration of a source signal is short and the reflected waves are easily removed using time window. The low signal to noise ratio due to low energy of the single signal is afraid, but the signal to noise ratio is much improved by the synchronous accumulation of many responses as waveform and the timing of pulse generation are quite stable.