Sweepable filter or semi-parametric equalizer is a modified form of parametric equalizer. A sweepable equalizer allows you to control the amplitude and frequency of band, but differ from parametric equalizer from having a pre-set bandwidth of center frequency.

However, some semi-parametric equalizer in some cases allows you to select between a shorter or narrow or wide pre-set bandwidth.

Applications

 Tonal enhancement

Primarily the parametric equalizer is used to boost those frequencies that are not coming out well on certain instruments. Just as on a “double bass” a string instrument certain types of notes can be played which could not be played at same volume as the other notes that can be played on double bass.

This can be resolved by a delicate, specific boost in frequency that doesn’t respond well which may cause it to go from not going well to become perfect.

Resonance reduction

Another important feature of parametric equalizer is that you can always reduce or remove or even enhance the excessive unwanted resonance which creates a “ringy” or “boomy” sound.

In some cases the music instruments such as electric guitars or double basses have an excessive amount of boominess which doesn’t go well in certain frequencies. Parametric equalizer can be used correct the frequency band and reduce the resonance of such boomy frequencies and reduce its volume.

Reducing extraneous noises

Extraneous noises can also be reduced to certain extent by parametric equalizer. Such extraneous noises consist of sounds from creaking of damp piano pedal or sound of a guitar pick etc.

Due to the harmonic content of these sounds it is not possible to completely remove these noises because it would require an extensive equalization process which alternatively end up in the drastic altering of the tonal character of audio signal.

Feedback prevention

Feed back is another problem that can be resolved through parametric equalizer. Feed back can be considered as excessive resonance of looping of certain type of frequencies of an audio system through a microphone which is closer to the speaker to which it is being sent, a “Notch filter” is generally used in parametric equalizer which cuts the frequency where feed back is occurring most. A quite narrow bandwidth is often used by notch filter to reduce the feed back.

Correction

There are certain peaks and dips of all speakers in their output frequencies. These peaks and dips can some time interact with the boundaries of the room that doesn’t make a pleasant sound. Parametric equalizer can help to cut or boost the peak or dip frequencies of speakers to make them go well.

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