Just-noticeable amplitude modulation of narrow-band noise is near 6 percent at high centre frequencies

Evidence

The amplitude resolution of communication systems is one of their most important characteristics, but it is not easy to measure this characteristic in our hearing system. Using pure tones, we have problems with the nonlinearities of our hearing system. Using narrow-band noise, the self-modulation of the noises distorts the effect that we are searching for. Only at very high centre frequencies can a narrow-band noise be produced that sounds like a steady sound, even though it is limited to a critical bandwidth. As outlined in Fig. 7.3, the just-noticeable degree of modulation is found to be near 6% in this case. This correlates with a threshold factor and a corresponding logarithmic threshold factor 7. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1120

Categorization

• QUESTION: The paragraph trails off at ‘This correlates with a threshold factor’ — curious what the stated factor value is, context cuts it off.