In processing electronic audio signals preemphasis refers to a system process designed to increase, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation differences or saturation of recording media in subsequent parts of the system. That is the mirror of the Deemphasis. The whole system is called Emphasis. The frequency curve is decided by special time constants. The Cutoff frequency can be calculated from that value. A system is an assemblage of inter-related elements comprising a unified whole. ... A band is a small section of the spectrum of radio communication frequencies, in which channels are usually used or set aside for the same purpose. ... Signal-to-noise ratio (often abbreviated SNR or S/N) is meaningful both in the context of information theory and, informally, for Usenet or other newsgroup-like services. ... Attenuation is the decrease of the amount, force, magnitude, or value of something. ... The term saturation generally means thoroughly full, and can refer to the following: In chemistry, see saturation (chemistry) for a number of meanings. ... In telecommunication, deemphasis is a system process designed to decrease, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena... The word emphasis, in addition to its main dictionary meaning, may have the following techincal meanings. ... The RC time constant, usually denoted by the Greek letter τ (tau), is a parameter that characterizes the frequency response of a resistance-capacitance (RC) circuit. ... The Butterworth filters frequency response, with cutoff frequency labeled. ...

Preemphasis is commonly used in telecommunications, digital audio recording, record cutting, in FM broadcasting transmissions, and in displaying the spectrograms of speech signals. BlackBerry 7100t Telecommunication refers to communication over long distances. ... Digital audio describes sound recording and reproduction systems which work by using a digital representation of the audio waveform. ... It has been suggested that Direct-drive_turntable be merged into this article or section. ... Roberts FM radio FM radio is a broadcast technology invented by Edwin Howard Armstrong that uses frequency modulation to provide high-fidelity sound over broadcast radio. ... In communications, transmission is the act of transmitting electrical messages (and the associated phenonomena of radiant energy that pass through media). ... A spectrogram of violin playing with linear frequency on the vertical axis and time on the horizontal axis. ...

An example of this is the RIAA equalization curve on 33rpm and 45rpm vinyl records. RIAA equalization is a specification for the correct playback of vinyl records, established by the Recording Industry Association of America. ... A gramophone record, (also phonograph record - often simply record) is an analog sound recording medium: a flat disc rotating at a constant angular velocity, with inscribed spiral grooves in which a stylus or needle rides. ...

See also Federal Standard 1037C and MIL-STD-188. Federal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U.S. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. ... MIL-STD-188 is a series of U.S. military standards relating to telecommunications. ...