Is frequency transposition the same as nonlinear frequency compression?
Who can benefit from this type of technology? The terms frequency lowering and frequency shifting are used to describe this type of signal processing strategy, with the methods by which this is accomplished as either via transposition or compression. Although there are significant technical differences between the various strategies, these terms are sometimes used interchangeably. These types of strategies are beneficial for improving audibility of high frequency consonants that are so critical for speech understanding and monitoring own voice quality. Frequency lowering also enables better perception of high frequency environmental sounds. Candidates for this type of technology include people with a wide range of hearing loss in the high frequencies. SoundRecover from Phonak is a propriety nonlinear frequency compression algorithm that is designed to compress and shift high frequency information into an adjacent area of audible hearing. SoundRecover is currently available in the Naida
