Sideband audibility shifts the detection criterion at high modulation frequencies
Evidence
The roll-off above the maximum is due to the audibility of sidebands so that instead of listening for a kind of modulation or roughness, one listens for additional tones as the modulation frequency is increased. The frequency selectivity of the ear, discussed in Sect. 4.3 on masking, is the reason for this different criterion being used. Sidebands cannot be heard when using broad-band noise, because the long time spectrum of white noise remains constant, even though high-frequency amplitude modulation is used. Consequently for noise, the dependence of the just-audible degree of amplitude modulation on modulation frequency is not affected by the audibility of sidebands. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1020
Categorization
Category: Causal Relationships
Related
- Above a threshold, modulation is heard as separate sideband tones rather than as flutter. (similarity 0.93)
- White noise shows no sideband-mediated detection ceiling for AM. (similarity 0.88)
- The ear ignores sideband phase once components fall outside one critical band (similarity 0.85)
- Narrow-band noise amplitude fluctuations mask periodic amplitude modulation detection (similarity 0.85)
- Auditory modulation frequency selectivity allows inherent masker fluctuations to be separated from beating-induced ones. (similarity 0.85)
- Hearing detects AM better than FM only when sidebands fall within a critical bandwidth (similarity 0.85)
- Noise fluctuations within narrow critical bands raise the masking index (similarity 0.84)
- Phase differences affect loudness only at low modulation frequencies the ear can track (similarity 0.84)
- Narrow-band noise’s intrinsic amplitude jitter masks external amplitude modulation detection (similarity 0.84)
- At very high modulation rates, listeners detect AM only via average intensity change. (similarity 0.83)
- Amplitude-modulation detection becomes easier once modulation spreads the spectrum beyond one critical band (similarity 0.83)
- The ear’s upper excitation slope is essential for detecting amplitude modulation at high levels (similarity 0.83)
- AM and FM sidebands become perceptually identical once spacing exceeds the critical bandwidth. (similarity 0.83)
- Broadband masking can compare filter-widening harm against temporal-coding harm (similarity 0.83)
- High modulation detection thresholds signal poor temporal representation of those rates. (similarity 0.83)