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The Langevin EQ-251-A, designed by Art Davis, was the first equalizer to use slide controls. [when?] It featured two passive equalization sections, a bass shelving filter, and a pass band filter. Each filter had switchable frequencies and used a 15-position slide switch to adjust cut or boost. The passive design required 14 dB of make-up gain. [9]
A television equalizer consequently typically requires more filter sections than an audio equalizer. To keep this manageable, television equalizer sections were often combined into a single network using ladder topology to form a Cauer equalizer. The second issue is that phase equalization is essential for an analog television signal.
RIAA equalization is a form of pre-emphasis on recording and de-emphasis on playback. A recording is made with the low frequencies reduced and the high frequencies boosted, and on playback, the opposite occurs.
An idealized and extreme smiley face curve shown using a 29-band graphic equalizer. A smiley face curve or mid scoop [1] in audio signal processing is a target frequency response curve characterized by boosted low and high frequencies coupled with reduced midrange frequency power.
Equalizer (audio), a device used for adjusting the volume of different frequency bands within an audio signal Equalizer (communications) , a device or circuit for correction of frequency dependent distortion in telecommunications
The EQP-1 is a passive equalizer with a tube amplifier stage that restores the gain lost from the passive EQ, making it practical for use in broadcast and recording. [5]Its low frequency section is a shelving EQ with three selectable frequency bands at 30, 60, and 100 Hz which can be simultaneously boosted or attennuated.
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ISO equal-loudness contours with frequency in Hz. An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness ...