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Discrimination of uniform spectrum pulse sequences.
The Journal of the Acoustical Society of America
|July 1, 1979
Summary
Listeners can distinguish between specific random polarity-modulated sequences (PLC sequences) and unconstrained random sequences. Discrimination relies on statistical redundancy and phase information, not just pulse patterns.
Area of Science:
- Acoustics
- Psychoacoustics
- Signal Processing
Background:
- Random polarity-modulated sequences are used in auditory research.
- Unconstrained sequences may lack spectral uniformity, unlike PLC sequences.
Purpose of the Study:
- To investigate listener discrimination of random polarity-modulated sequences.
- To determine factors influencing the discrimination of these sequences.
Main Methods:
- Production of polarity-modulated sequences using the Pierce, Lipes, and Cheetham (PLC) method.
- Listener discrimination tests comparing PLC sequences with unconstrained random sequences.
Main Results:
- Listeners could clearly discriminate between PLC sequences and unconstrained random sequences.
- Discrimination was more closely linked to statistical redundancy than run-length distribution.
- Discrimination remained effective despite temporal jitter.
Conclusions:
- Listener discrimination of PLC sequences is robust and relies on statistical redundancy and phase information.
- The findings suggest phase information is crucial for auditory perception of these sequences.