Abstract
The pulse method has become increasingly popular for experimental researches on room acoustics, since speech and music may usually be regarded as pulsive tones emitted in succession. We have made a convenient apparatus for this purpose. The A. C. pulse which is used as the sound source is composed on an audio frequency carrier of arbitrary duration, which carrier, if required, can be modulated in frequency. The oscilloscope may be made to display alternatively any two of either the transient wave form, the envelope of the reflected pulse tones, the timing, or the wave form of the source in two elements. A general description of the apparatus and some examples of measurements are given.
