Method and micro-processor-based apparatus for measuring environmental noise pollution.

摘要

This invention relates to a method and a microprocessor-based apparatus for directly measuring the noise using a nuisance index (LDI) bound to two physical parameters of the noise: the average energy level (LE) 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 (LE) and simultaneously to the second input of comparator (6) which supplies the parameter (L phi ) through counter (8) associated to a trimmer (10). Parameters (LE) and (L phi ) are indicated in block (9) of the display.