With only a few exceptions, theories about the origins of madness and neurosis prior to psychoanalysis emphasized a patient's emotional life.
normally, previous to a few procedure, which include transmission over cable, or recording to phonograph document or tape, the input frequency variety maximum susceptible to noise is boosted. this is known as "pre-emphasis" – earlier than the technique the signal will go through. Later, when the sign is obtained, or retrieved from recording, the reverse transformation is applied ("de-emphasis") in order that the output as it should be reproduces the original enter. Any noise brought by transmission or record/playback, to the frequency variety previously boosted, is now attenuated within the de-emphasis degree.
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