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2. Equalization (audio) - Wikipedia

   en.wikipedia.org/wiki/Equalization_(audio)

   A graphic equalizer also implements second-order filter functions in a more user-friendly manner but with somewhat less flexibility. This equipment is based on a bank of filters covering the audio spectrum in up to 31 frequency bands. Each second-order filter has a fixed center frequency and Q factor, but an adjustable level.

3. Smiley face curve - Wikipedia

   en.wikipedia.org/wiki/Smiley_face_curve

   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.

4. Akai AR900 - Wikipedia

   en.wikipedia.org/wiki/Akai_AR900

   According to an article from the French version of Keyboard magazine of September 1989: [2] The AR900 offers a realtime stereo Spectrum Analyzer. An extension of the EQ tool, the analyzer's frequencies are represented graphically on the LCD, with each dot having a precision of 3db, when used in stereo, and 1.5db when used one channel at a time.

5. Spectrum analyzer - Wikipedia

   en.wikipedia.org/wiki/Spectrum_analyzer

   A spectrum analyzer is also used to determine, by direct observation, the bandwidth of a digital or analog signal. A spectrum analyzer interface is a device that connects to a wireless receiver or a personal computer to allow visual detection and analysis of electromagnetic signals over a defined band of frequencies.

6. Smaart - Wikipedia

   en.wikipedia.org/wiki/Smaart

   Smaart running as a spectrum analyzer, in spectrograph view. In spectrograph view, Smaart displays a real-time spectrum analysis, showing the relative strength of audio frequencies for one audio signal. Needing only one channel of audio input, this capability can be used for a variety of purposes.

7. Total Recorder - Wikipedia

   en.wikipedia.org/wiki/Total_Recorder

   The following free and trial add-ons are available: Audio Restoration Add-On, Automatic Gain Control and Speech Enhancement Add-On, Spectrum Analyzer and Graphic Equalizer Add-On, Digital Mixer Add-On, Ogg Vorbis Support Add-On, Send to iTunes/iPod Add-On, Streaming Add-on.