Aperiodic noise maskers are studied using repeated random pulse sequences with long periods.

Evidence

Many sounds that produce masking do not show any period. This is especially true for noise maskers. In order to be able to measure masking elicited by such noises, a special noise having a long period of several seconds has to be produced. Such noises are generated by repeated random sequences of pulses. The period of such noises is not audible to the subjects if it is longer than several seconds. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 562

Many sounds that produce masking do not show any period. This is especially true for noise maskers. In order to be able to measure masking elicited by such noises, a special noise having a long period of several seconds has to be produced. Such noises are generated by repeated random sequences of pulses. The period of such noises is not audible to the subjects if it is longer than several seconds. Using a test-tone burst presented at a certain moment within a period of this artificial noise, a masking effect similar to that produced in temporal masking patterns can be measured. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 562

Categorization

• DEFINE: Explains the methodological trick of creating quasi-aperiodic noise with a long period.
• corroborated: 2 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 562