Page 36 - Acoustics Today Summer 2011
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                                          Fig. 7. Frequency compression compresses the high-frequency part of the spectrum into a narrower frequency range. Vertical stems represent a set of harmonic frequency components, with the transposed components depicted in red. The unprocessed spectral envelope is represented by a black dashed line.
  Fig. 8. A spectral peak is detected at 6 kHz, and replicated at 3.1 kHz (red area), within the patient’s aidable hearing range.
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