| Popis: |
This paper discusses the application of an analog correlator, computing the crosscorrelation function between two sound pressures, to such measurement problems as the localization of noise sources, the determination of transmission loss, and the measurement of room transient response. The crosscorrelation function φ21(τ) between two nonperiodic signals will have a peak in amplitude if a component of each signal originates from a common source. The value of time delay τ for which this peak occurs equals the difference in time required for the individual components to propagate from the common source to the two points under study. An analog electronic correlator has been constructed which, by employing the above‐mentioned property, can separate the acoustic signal at a given point into components according to: (1) their points of origin (assuming independent sources), and (2) the transit time from source to the point in question. Preliminary experimental results substantiate methods for determining the amou... |
