Файл: E-mu E 6400 EOS 4.0 manual.pdf

6 - Sample Edit

Parametric Equalizer

O A standard analog parametric equalizer may be useful in order to locate the frequencies which need EQ. The digital EQ can then be used to actually filter the sample with ultra-low noise and phase linear response.

If you pressed OK, the parametric equalizer parameters are displayed.

Frequency

•Gain: Controls “how much” boost or cut will be applied to the signal.

•Center Frequency: Selects the center frequency to be boosted or cut.

•Bandwidth: Sets the width of the band to be boosted or cut.

7.Specify the parametric equalizer parameters using the Data Entry Control or the INC/DEC keys.

•Coarse/Fine: Fast forward through the values using Coarse, then switch to Fine for single digit editing.

8.Press OK to process the sample section or Cancel to cancel the operation.

O Holding down the Enter key while turning the Data Entry Control allows “fine tuning” of the value by one number per click.

FIR (Phase Linear Filter)

The phase linear filter was originally developed on the EIII to separate the attack and sustain portions of piano samples. Ordinary filters cause serious phase distortion at the cutoff point. This FIR filter has much less phase distortion than a typical filter and so is better suited for sample splicing. The phase linear filter acts on the ENTIRE sample, unlike the parametric filter which can filter any portion of the sample. This ensures strict phaselinearity. There are five types of phase linear filters available: Lowpass,

Highpass, Bandpass, Allpass and Notch.

The Points parameter determines the Quality or Q of the filter. The larger the Point value, the more the filter behaves like an ideal filter and the steeper the filter slope. The Points parameter is variable from 5 to 99.

The Frequency parameter determines the cutoff frequency of the filter and is calibrated in Hertz. When Bandpass or Notch filters are selected, a second frequency field appears to allow you to specify the frequencies on either side of the passband or notch.

The Allpass filter is a special purpose filter that is used to add delay to a sample before it is recombined with a filtered sample. Recombining allows you to perform band-splitting or frequency boosting instead of frequency attenuation.

v To Filter a Sample:

1.Press the Sample Edit key. The LED illuminates and the main sample edit screen appears.

2.Select the sample that you want to equalize using the Data Entry Control, INC/DEC keys, or the numeric keypad.

3.Press the Tools 3 function key (F4). Another row of function keys appears.

4.Press the FIR function key (F4). The following screen appears.

5.Select the filter Type: Lowpass, Highpass, bandpass, Notch or Allpass.

6.Set the filter slope by adjusting the Points parameter. The higher the number, the steeper the filter slope.

7.Set the Frequency parameter to the desired frequency. If you chose the Bandpass or Notch filters, the Frequency 2 field will appear, allowing you to set the lower frequency in the range.

8.Press OK to filter the sample or Cancel to cancel the operation.

• Alternate Filter Responses

Low Shelving Boost - Add Lowpass with original signal.

High Shelving Boost - Add Highpass with original signal.

Band Boost - Add Bandpass with original signal.