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The 10 Band Graphic Equalizer
The 10 Band Graphic Equalizer is a familiar filter that acts like an expanded tone control. The audio spectrum is broken into 10 bands, each being one octave wide. Each band's gain (volume) can be independently adjusted to achieve the desired audio result. This filter is useful for tonal shaping of the finished audio product or to enhance the bass or treble of a recording. It is also useful for improving the intelligibility of recordings or "Bringing Out" a particular instrument or vocal.
The Graphical Equalizer is the digital equivalent (which is IIR based) to the analog Graphical Equalizer found in many sound systems. It uses 2nd order resonant (peaking) techniques to achieve its results. Its primary advantage is that it can be applied to a .wav file without having to resort to adding an analog step in your sound restoration process. This results in decreased noise and distortion on your final product. The equalizer has ten bands containing the following center frequencies:
31 Hz, 62 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz
8 kHz, 16 kHz
The 10 Band Graphic Equalizer
The amplification and attenuation range for each band is + / - 12 dB. A "Reset Levels" feature is provided. Clicking on "Reset Levels" will return all of the Graphical Equalizer slider controls to their 0 dB position. Since the graphic equalizer can add gain to your signal, a latching overload indicator is provided. If, at any time during the processing of a file through the graphic equalizer, the output signal exceeds the dynamic range of the system, the indicator will turn red and latch until the filter is re-run. The top and bottom bands are also peaking type filters and not shelving types. If shelving filters are needed, please refer to the Paragraphic EQ which includes two bands that can be operated in that mode.
Note 1: The top equalizer band of 16,000 Hz is only effective when using a sample rate of 44.1 kHz or higher; it becomes ineffective at sampling rates of 22.05 kHz and 11.025 kHz. The 8,000 Hz band will also be rendered ineffective when using a sampling rate of only 11.025 kHz.
Note 2: The graphic equalizer controls can be adjusted "live" when the preview mode button is clicked.
Note 3:Since the graphic equalizer can actually increase the gain of the system, it is possible to produce clipping which will result in unpleasant distortion products to appear in the Destination Workspace. This usually occurs when excessively boosting the bass portion of the spectrum. The overload indicator will change from green to red, and latch in that condition if there has been an overload. The latch will be reset, following a re-run of the algorithm, provided that the overload condition has been cleared by reducing gain in one or more bands. A good remedy for this is via the overall “Gain” control; reduce its setting if clipping occurs.
Graphic Equalizer Operating Procedure (Tutorial)
The 10 Band Graphic Equalizer is a familiar filter that acts like an expanded tone control. The audio spectrum is broken into 10 bands, each being one octave wide. Each band's gain (volume) can be independently adjusted to achieve the desired audio result. This filter is useful for tonal shaping of the finished audio product or to enhance the bass or treble of a recording. It is also useful for improving the intelligibility of recordings or "Bringing Out" a particular instrument or vocal.
The Graphical Equalizer is the digital equivalent (which is IIR based) to the analog Graphical Equalizer found in many sound systems. It uses 2nd order resonant (peaking) techniques to achieve its results. Its primary advantage is that it can be applied to a .wav file without having to resort to adding an analog step in your sound restoration process. This results in decreased noise and distortion on your final product. The equalizer has ten bands containing the following center frequencies:
31 Hz, 62 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz
8 kHz, 16 kHz
The 10 Band Graphic Equalizer
The amplification and attenuation range for each band is + / - 12 dB. A "Reset Levels" feature is provided. Clicking on "Reset Levels" will return all of the Graphical Equalizer slider controls to their 0 dB position. Since the graphic equalizer can add gain to your signal, a latching overload indicator is provided. If, at any time during the processing of a file through the graphic equalizer, the output signal exceeds the dynamic range of the system, the indicator will turn red and latch until the filter is re-run. The top and bottom bands are also peaking type filters and not shelving types. If shelving filters are needed, please refer to the Paragraphic EQ which includes two bands that can be operated in that mode.
Note 1: The top equalizer band of 16,000 Hz is only effective when using a sample rate of 44.1 kHz or higher; it becomes ineffective at sampling rates of 22.05 kHz and 11.025 kHz. The 8,000 Hz band will also be rendered ineffective when using a sampling rate of only 11.025 kHz.
Note 2: The graphic equalizer controls can be adjusted "live" when the preview mode button is clicked.
Note 3:Since the graphic equalizer can actually increase the gain of the system, it is possible to produce clipping which will result in unpleasant distortion products to appear in the Destination Workspace. This usually occurs when excessively boosting the bass portion of the spectrum. The overload indicator will change from green to red, and latch in that condition if there has been an overload. The latch will be reset, following a re-run of the algorithm, provided that the overload condition has been cleared by reducing gain in one or more bands. A good remedy for this is via the overall “Gain” control; reduce its setting if clipping occurs.
Graphic Equalizer Operating Procedure (Tutorial)
- Click on the Filter Menu.
- Click on "EQ".
- Click on “10 Band Graphic EQ”.
- Using your Mouse, adjust the frequency band slider control(s) up or downwards as desired. This can be accomplished by directly pointing the cursor with the mouse and depressing the left mouse button to move the control.
- When the Slider control for a particular band is in its center position, the band is neither being attenuated or amplified. Moving the slider upwards produces amplification of frequencies in the band up to 12 dB. Moving the slider downwards produces attenuation of frequencies in the band of up to 12 dB.