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Principal-component amplitude compression for the hearing impaired.
1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139.
The Journal of the Acoustical Society of America
|October 1, 1987
Summary
Principal-component amplitude compression improved speech intelligibility for sensorineural hearing-impaired listeners by managing overall sound level. Compression of PC1 and wideband compression were most effective, unlike PC2 compression which hindered performance.
Area of Science:
- Audiology
- Speech processing
- Signal processing
Background:
- Sensorineural hearing impairment reduces dynamic range, affecting speech perception.
- Principal-component amplitude compression (PCAC) aims to restore audibility and preserve spectral details.
- PC1 represents overall speech level, PC2 spectral tilt.
Purpose of the Study:
- To evaluate the impact of PCAC on speech intelligibility in sensorineural hearing-impaired listeners.
- To compare PCAC with linear amplification (LA), multiband compression (MBC), and wideband compression (WC).
Main Methods:
- Two PCAC systems were tested: PC1 compression and PC1+PC2 compression.
- Performance was compared against LA, MBC, and WC.
- Speech intelligibility was assessed in sensorineural hearing-impaired listeners.
Main Results:
- Compression of PC1 and WC improved intelligibility compared to LA.
- MBC showed benefits but was not superior to WC.
- Compression of PC2 degraded performance relative to LA.
Conclusions:
- PCAC focusing on overall level (PC1) and WC enhance speech intelligibility.
- Preserving spectral shape and improving audibility are key for optimal intelligibility.
- PC2 compression is not beneficial for speech intelligibility in this context.