Method and device for measuring frequency selectivity and for assessing hearing filter pattern through frequency selectivity testing procedure has noise level adjuster to adjust levels of noise signals from noise generator

摘要

A testing device has a noise generator (1), a noise level adjuster (2), a band stop width adjuster (3), a sound signal detector (4), an adjuster (5) for detected sound signal levels, an adding element (6), a receiver (7) and a band stop width display (8). The noise level adjuster adjusts levels of noise signals arising from the noise generator at a calibrated level and displays acoustic pressure levels arising from a receiver.