Abstract
Digital signal processing (DSP) hearing aids have made many advances since they were first successfully introduced in 1996. Today’s premium DSP hearing aids use far more sophisticated algorithms to process sounds than those of a few years ago. Some examples are modern algorithms for compression, feedback management, noise reduction, and control of directional microphones. The focus on finding more sophisticated ways to process sounds may be one reason that digital hearing aids accounted for 66% of all hearing aid sales in the United States in 2003.1 As DSP technology continues to advance, it is being extended to hearing aid applications not directly related to sound processing. Such applications are already evident in the use of DSP hearing aids for in situ threshold measurement2 and self-diagnostic testing.3 Another new application of DSP is for sound pressure level (SPL) measurement.
Published Version
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