Abstract
There is a revised interest in replacing the time-consuming and burdensome methods in the current ANSI and ISO standards for qualifying reverberation rooms for sound power measurements of discrete frequency sources. With the advent of digital signal processing, a combination of a deterministic multitone test signal and an FFT routine could be used to perform a fairly quick qualification test. A more elegant method using the m-sequence as the deterministic multitone signal has been tested in the IRC/NRC laboratory. This method has the advantage that it is relatively immune to external background noise so that the near field response of the test loudspeaker could be determined outdoors without using an anechoic room. In addition, all the required frequency components in the different one-third octave bands can be obtained in one single measurement. A detailed description of the procedure and results obtained will be presented.
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