Glossary

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filter A filter allows to treat a sound signal between two limit frequencies that determins the frequency range of its action. It rejects all the frequencies of the signal that are not present between these two limits.

frequency "the number of repetitions or cycles per second (cps) in a sound. The auditory (subjective) correlate of frequency is pitch. For example, high frequencies result in ""high"" pitch perceptions.

Depending upon the frequency of the incoming sound, the point of maximum displacement occurs at different points within the coiled cochlea. This is because the structures within the cochlea change in mass along the length giving different parts different resonant frequencies. For example, higher frequency sound waves create maximum displacements at the base (bottom) of the cochlea where the activated nerve fibers produce “high” pitch perceptions. Conversely, lower frequency sound waves create maximum displacements toward the apex (top) of the cochlea where the excited nerve fibers produce “low” pitch perceptions."