Tone-on-tone masking thresholds are measured via narrow-band noise maskers instead

Evidence

It is relatively difficult to exactly measure thresholds of tones masked by tones. Therefore, the thresholds of pure tones masked by narrow-band noises are used to construct the excitation level versus critical-band rate patterns. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 973

Categorization

• XREF: This methodological substitution — narrow-band noise standing in for pure-tone maskers because exact tone-on-tone measurement is too hard — parallels how soundscape work substitutes measurable proxies for elusive targets.