Method and microprocessor-based apparatus for directly measuring

Details Method and microprocessor-based apparatus for directly measuring Method and microprocessor-based apparatus for directly measuring

1988-12-16

1991-12-10

Lall, Parshotam S.

Boots, shoes, and leggings

364505, 381 56, 181 05, 73647, G01H 300, G08B 2100

Patent

active

050724150

ABSTRACT:
This invention relates to a method and a microprocessor-based apparatus for directly measuring the noise using a nuisance index (L.sub.DI) bound to two physical parameters of the noise: the average energy level (L.sub.E) and the fluctuation level of the noise.
The apparatus is comprised of a microphone (M) connected to a pre-amplifier (1) and a detecting unit (2) controlling an analogical-to-digital converter (3) associated to a time (4) feeding a signal to a digital filter (5) and at the same time to one input of a comparator (6). The filter (5) feeds the filtered signal to an integrator (7) supplying the parameter (L.sub.E) and simultaneously to the second input of comparator (6) which supplies the parameter (L.sub..phi.) through counter (8) associated to a trimmer (10). Parameters (L.sub.E) and (L.sub..phi.) are indicated in block (9) of the display.

REFERENCES:
patent: 3778552 (1973-12-01), Edinborgh
patent: 3848471 (1974-11-01), Hamburg et al.
patent: 3892133 (1975-07-01), Quinn
patent: 4020286 (1977-04-01), Ceci
patent: 4307385 (1981-12-01), Evans et al.
patent: 4554639 (1985-11-01), Baker et al.
Bruel & Kjaer, Noise, Vibration, Light, Thermal Comfort Pocket Handbook, Sep. 1986, pp. 10, 13, 16.
Bruel & Kjaer, Modular Precision Sound Level Meter, Type 2231, Product Brochure, 8 pages, 7/88.
New Sound-Level Analyzers Utilize Digital Sampling Techniques by Ceci & Stolberg, Sound & Vibration, May 1975, pp. 12, 14.

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