Reverberation characteristics measuring device

Details Reverberation characteristics measuring device Reverberation characteristics measuring device

1981-04-20

1983-06-28

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

G01H 700

Patent

active

043898920

ABSTRACT:
A device for measuring reverberation characteristics in a reverberation room by a digital squaring and integrating computation process. According to the invention, only a part of digital data of a large word length obtained by squaring and integrating a reverberation signal is selected out for computing the reverberation characteristics in accordance with a measuring environment such as integration time and duration of a test pulse. By this arrangement, circuitry for computing the reverberation characteristics can be made compact and time required for computing can be shortened without sacrificing the accuracy of measurement. Further, according to the invention, the level of an input signal can be computed and displayed by computing intermediate squared and integrated data at a certain time interval and adding this data with compensation data corresponding to a frequency band width of the input signal. The compensation data is automatically calculated in accordance with a set frequency of the test pulse so that a concise input signal level computation and display circuit can be provided.

REFERENCES:
patent: 3270833 (1966-09-01), Schroeder
patent: 3352378 (1967-11-01), Schroeder
patent: 3827288 (1974-08-01), Fletcher
Pallett et al.--Noise Control Engineering, vol. 7, No. 2, pp. 71-80, Sep.-Oct. 1976.

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