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A process for reducing the relative strength of higher audio frequencies before reproduction, to complement and thereby offset the preemphasis that was introduced to help override noise or reduce distortion. Also known as postemphasis; postequalization.



Related Terms

BEAM WIDTH

The angular measure of the transverse section of a beam (usually in the main lobe) Lying within directions corresponding to specified values of field strength relative to the maximum (e.g., half field strength beam width and half power beam width). The beam width is usually measured in one or more specified planes contain- ing the axis of the beam.

LOBE

The portion of the overall radiation pattern of a directional antenna which is contained within a region bounded by adjacent minima. The main beam is the beam in the lobe containing the direction of maximum radiation (main lobe) lying within specified values of field strength relative to the maximum field strength.

S.N.R.

Signal to noise ratio - GPS indicator of satellite signal strength against background electrical noise. Higher numbers represent better reception.

HYDROTREATING

[CHEMENG] Oil refinery catalytic process in which hydrogen is contacted with petroleum intermediate or product streams to remove impurities, such as oxygen, sulfur, nitrodirect indication of the amount of moisture in the air or other gas, the indication usually being in terms of relative humidity as a percentage which the moisture present bears to the maximum amount of moisture that could be present at the location temperature without condensation taking place.

OVERRIDING PROCESS CONTROL

Process control in which any one of several controllers associated with one control valve can be made to override another in accordance with a priority requirement of the process.

GLASSED STEEL

Process piping or vessels lined with glass; a glass-steel composite has structural strength of steel and corrosion resistance of glass.

DECISION CALCULUS

A guide to the process of decision-making, often outlined in the following steps: analysis of the decision area to discover applicable elements; location or creation of criteria for evaluation; appraisal of the known information pertinent to the applicable elements and correction for bias; isolation of the unknown factors; weighting of the pertinent elements, known and unknown, as to relative importance; and projection of the relative impacts on the objective, and synthesis into a course of action.

NOISE REDUCTION

[ENG ACOUS] A process whereby the average transmission of the sound track of a motion picture print, averaged across the track, is decreased for signals of low level; since background noise introduced by the sound track is less at low transmission, this process reduces noise during soft passages.

COLLAPSE PROPERTIES

Strength and dimensional attributes of piping, tubing, or process vessels, related to the ability to resist collapse from exterior pressure or internal vacuum.

SNR

Signal to noise ratio - GPS indicator of satellite signal strength against background electrical noise. Higher numbers represent better reception.

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