6 - Sample Edit
Compressor
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O The Start and End points |
Compressor |
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The Digital Compressor is a digital (non-realtime) equivalent of an analog |
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are “remembered” from module |
dynamic range compressor with attack and release times, adjustable |
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to module so that you can |
threshold, adjustable ratio, and three modes of operation. |
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perform successive operations |
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on the same section of the |
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sample. |
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1.Press the Sample Edit key. The LED illuminates and the main sample edit screen appears.
2.Select the sample that you want to compress 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.
If the sample is stereo, a 4. Press the Comprsr function key (F2). The following screen appears.
pop up dialog box will ask you |
A waveform display appears with several controls. |
to select left, right or both sides. |
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Waveform Display |
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Editing |
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Fields |
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Vertical |
Zoom |
Zoom In |
Zoom In |
Scale |
Out |
at Start |
at End |
Magnifier |
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Point |
Point |
OHolding down the Enter • Editing Fields: Move the cursor to the desired field to change the
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key while turning the Data Entry |
Start and End points of the sample section to be compressed. |
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Control allows “fine tuning” of |
• Magnification: Adjusts the vertical scale for 1x, 2x, 4x, or 8x |
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the value by one number per |
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magnification. Pressing the button repeatedly rotates through the |
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click. |
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4 options. |
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• The Zoom controls also |
• Zoom Start: Magnifies the waveform to display finer detail around |
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change the editing resolution. |
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the Start point of the selected section. |
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• Zoom End: Magnifies the waveform to display finer detail around |
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the End point of the selected section. |
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• Zoom Out: Reverses the effect of Zoom Start & Zoom End. |
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5. Specify the Start and End points for the section of the sample to be |
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processed. |
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6. Press OK when you have selected the desired section or press Cancel to |
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cancel the operation. |
EOS 4.0 Software Manual 221
6 - Sample Edit
Compressor
7. If you pressed OK, the following screen appears.
Mode
•RMS: Root-mean-square or an “average of the magnitude of the signal”. RMS represents the “true” energy content of a signal.
•Peak: Uses the peak amplitude of a signal to determine the amplitude. The peak amplitude is a meaningful measurement in a digital system because of the 96 db (16-bit) headroom limit.
Threshold
•Above: Only signal levels above the threshold % will be affected by the compressor.
•Center: Signal levels above as well as below the threshold % will be affected by the compressor.
•Below: Only signal levels below the threshold % will be affected by the compressor.
•%: Determines the threshold level as a percentage of 100% of 16-bits.
Compression Ratio
Determines the amount of compression or expansion. Ratios of greater than 1:1 compress dynamic range. Ratios of less than 1:1 expand dynamic range.
•Compression: Reduces the amount of dynamic range. Levels remain more constant.
•Expansion: Expands the amount of dynamic range. Changes in level are exaggerated.
Attack Time
Determines how quickly the gain will be turned down. The attack time is variable from 1 to 999 milliseconds.
Release Time
Determines how quickly the gain will be turned up. The release time is variable from 1 to 999 milliseconds.
6 - Sample Edit
Compressor
8.Press OK when you have set the desired options or press Cancel to cancel the operation.
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Compressor Threshold |
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Only signal levels ABOVE |
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100% |
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1:1 |
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2:1 |
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the Threshold percentage |
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will be affected by the |
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50% |
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10:1 |
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compressor. |
Threshold |
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0% |
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Above |
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Signal levels ABOVE as |
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100% |
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1:1 |
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well as BELOW the |
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2:1 |
Threshold percentage will |
Threshold |
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50% |
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10:1 |
be affected by the |
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compressor. |
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0%
Center
Only signal levels BELOW |
100% |
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the Threshold percentage |
Threshold |
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will be affected by the |
50% |
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10:1 |
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compressor. |
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2:1 |
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1:1 |
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0% |
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Below
EOS 4.0 Software Manual 223
6 - Sample Edit
Using the Digital Compressor
Using the Digital Compressor
Limiter
A limiter prevents the signal from exceeding a preset level (threshold).
Signal levels below the threshold will be unaffected.
Set the controls as follows:
Threshold: Above, XX% (where XX is the limit point).
Ratio: >10:1
Attack Time: 1 mS
Release Time: approximately 100 mS
Musical Compression (e.g. Guitar)
This type of compression tries to keep the volume constant, generally to increase the sustain of the instrument. As the note dies away, the compressor will boost the level in an effort to keep the level constant.
Set the controls as follows:
Threshold: Center, XX% (where XX is the compression point).
Ratio: approximately 4:1
Attack Time: 1 mS to 100 mS
Release Time: > 100 mS
Noise Reduction
Noise reduction will reduce low levels even further in the assumption that low levels are noise.
Set the controls as follows:
Threshold: Below, approximately. 30%
Ratio: approximately 0.7:1
Attack Time: approximately 100 mS
Release Time: approximately 100 mS
6 - Sample Edit
Parametric Equalizer
O The Start and End points |
Parametric Equalizer |
Parametric EQ allows you adjust the individual parameters of the filter. |
are “remembered” from module |
Boost/Cut controls “how much” of the signal will be boosted or cut. Center |
to module so that you can |
Frequency sets the center frequency to be boosted or cut, and the |
perform successive operations |
Bandwidth control sets the width of the band to be boosted or cut. The |
on the same section of the |
three parameters are diagrammed on the following page. |
sample. |
The parametric equalizer is a digital (non real-time) equivalent of an analog |
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equalizer with +12 dB of boost and a whopping -48 dB of cut. Center |
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frequency and bandwidth controls are accurate, precise and have an excep- |
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tionally wide range. |
OThe left and right cursor v To Filter a Sample:
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buttons will change the start |
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Press the Sample Edit key. The LED illuminates and the main sample |
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and end points so that they fall |
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edit screen appears. |
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on positive zero-crossing points |
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2. |
Select the sample that you want to equalize using the Data Entry |
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in the waveform. This will |
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minimize clicks in the sound |
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Control, INC/DEC keys, or the numeric keypad. |
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when processing only part of a |
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Press the Tools 3 function key (F4). Another row of function keys |
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sample. |
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appears. |
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4. Press the ParEQ function key (F3). The following screen appears. |
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OIf the sample is stereo, a • The Select Section display controls are identical to the controls in
pop up dialog box will ask you |
Truncate. See Truncate for a full description of the controls. |
to select left, right or both sides. |
5. Specify the Start and End points for the portion of the sample to be |
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EQ'ed using the Data Entry Control, left/right cursor keys, INC/DEC |
O Holding down the Enter |
keys or the numeric keypad. |
6. Press OK to continue on to the next page of options or Cancel to cancel |
key while turning the Data Entry |
the operation. |
Control allows “fine tuning” of |
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the value by one number per |
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click. |
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EOS 4.0 Software Manual 225