Effect of Slow-Acting Wide Dynamic Range Compression on Measures of Intelligibility and Ratings of Speech Quality in Simulated-Loss Listeners

Rosengard, Peninah S.; Payton, Karen L.; Braida, Louis D.
June 2005
Journal of Speech, Language & Hearing Research;Jun2005, Vol. 48 Issue 3, p702
Academic Journal
The purpose of this study was twofold: (a) to determine the extent to which 4-channel, slow-acting wide dynamic range amplitude compression (WDRC) can counteract the perceptual effects of reduced auditory dynamic range and (b) to examine the relation between objective measures of speech intelligibility and categorical ratings of speech quality for sentences processed with slow-acting WDRC. Multiband expansion was used to simulate the effects of elevated thresholds and loudness recruitment in normal hearing listeners. While some previous studies have shown that WDRC can improve both speech intelligibility and quality, others have found no benefit. The current experiment shows that moderate amounts of compression can provide a small but significant improvement in speech intelligibility, relative to linear amplification, for simulated-loss listeners with small dynamic ranges (i.e., flat, moderate hearing loss). This benefit was found for speech at conversational levels, both in quiet and in a background of babble. Simulated-loss listeners with large dynamic ranges (i.e., sloping, mild-to-moderate hearing loss) did not show any improvement. Comparison of speech intelligibility scores and subjective ratings of intelligibility showed that listeners with simulated hearing loss could accurately judge the overall intelligibility of speech. However, in all listeners, ratings of pleasantness decreased as the compression ratio increased. These findings suggest that subjective measures of speech quality should be used in conjunction with either objective or subjective measures of speech intelligibility to ensure that participant-selected hearing aid parameters optimize both comfort and intelligibility.


Related Articles

  • Compression in Hearing Aids: Why Fast Multichannel Processing Systems Work Well. Villchur, Edgar // Hearing Review;Jun2008, Vol. 15 Issue 6, p16 

    The article focuses on the fast multichannel amplitude compression in hearing aids. Studies investigate claims that fast multichannel compression reduces speech intelligibility. Findings reveal that unless listeners require enhanced loudness contrast cues to speech recognition, the reduction of...

  • Long-Term Signal-to-Noise Ratio at the Input and Output of Amplitude-Compression Systems. Naylor, Graham; Johannesson, RenĂ© Burmand // Journal of the American Academy of Audiology;Mar2009, Vol. 20 Issue 3, p161 

    We present measurements showing that the long-term signal-to-noise ratio (SNR) at the output of an amplification system that includes amplitude compression may be higher or lower than the long-term SNR at the input, dependent on interactions among the actual long-term input SNR, the modulation...

  • Effective compression and noise reduction configurations for hearing protectors.  // Noise & Vibration Worldwide;Mar2008, Vol. 39 Issue 3, p32 

    The article focuses on three experiments that have been carried out to investigate the effects of compression and noise reduction configurations on the amount of noise reduction, speech intelligibility, and overall preferences using existing digital hearing aids. Experiment 1 reveals that the...

  • MPO: A Forgotten Parameter in Hearing Aid Fitting. Kuk, Francis; Korhonen, Petri; Baekgaard, Lars; Jessen, Anders // Hearing Review;Jun2008, Vol. 15 Issue 6, p34 

    The article focuses on the maximum power output (MPO) as an important consideration in hearing aid selection. A low MPO means the hearing aid is saturated with distortion and experiences compression limitation at a low output level, while a high MPO suggests no distortion or saturation. It...

  • 12 Lessons Learned About Linear Frequency Transposition. Kuk, Francis; Keenan, Denise; Peeters, Heidi; Korhonen, Petri; Auriemmo, Jane // Hearing Review;Nov2008, Vol. 15 Issue 12, p32 

    The article looks at different facts and findings about linear frequency transposition. Frequency transposition refers to a lack of amplification in the transposed area. The Audibility Extender (AE) is the only frequency lowering algorithm that utilizes transposition instead of compression. The...

  • From the Editor. Ricketts, Todd A. // Trends in Amplification;2002, Vol. 6 Issue 4, preceding p131 

    The article focuses on hearing aids. In the past 10 years one has seen commercial digital hearing aids move from non-existence to representing more than 30% of the hearing aids sold. As quickly as digital hearing aids have advanced one has seen even faster changes in other areas. One such area...

  • Another Gender Difference? Jerger, James // Journal of the American Academy of Audiology;Sep2003, Vol. 14 Issue 7, Precedeing p347 

    Offers views regarding the variation in the benefit that different individuals obtain from the use of amplification. Information on a research conducted by Anna Nabelek and her research group that measured that amount of background noise that a user can tolerate when listening to speech;...

  • Trends in Classroom Amplification. Lewis, Dawna E. // Contemporary Issues in Communication Science & Disorders;Fall2008, Vol. 35, p122 

    Advances in hearing instrument and frequency-modulated (FM) technology provide audiologists and families with many choices when selecting classroom amplification. An understanding of the benefits and limitations of amplification options, as well as an understanding of current fitting and...

  • Fast Intra-frame Compression for Video Conferencing using Adaptive Shift Coding. Sagheer, Ali Makki; Farhan, Ahmeed Suliman; George, Loay E. // International Journal of Computer Applications;Nov2013, Vol. 81, p29 

    Overhead of video transmission over the Internet is increasing the exponentially every day. Optimization of natural bandwidth is the basic motive by compressing video to the maximum extend. This paper introduces a new idea for intra- frame compression. Most standard compression algorithms...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics