Bedienungsanleitung Yamaha 01X (Seite 122 von 156) (Englisch)

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Before Using Basics Section AppendixGetting Started Reference

122

01X Owner’s Manual

Parameter Lists

Explanations for Dynamics Parameters

● Compressor (CMP) parameters:

Threshold (THRESH) determines the level of input signal

required to trigger the compressor. Signals at a level below the

threshold pass through unaffected. Signals at and above the

threshold level are compressed by the amount speciﬁed using

the Ratio parameter.

Ratio controls the amount of compression — the change in out-

put signal level relative to change in input signal level. With a 2:1

ratio, for example, a 10 dB change in input level (above the

threshold) results in a 5 dB change in output level. For a 5:1

ratio, a 10 dB change in input level (above the threshold) results

in a 2 dB change in output level.

Attack controls how soon the signal is compressed once the

compressor has been triggered. With a fast attack time, the sig-

nal is compressed almost immediately. With a slow attack time,

the initial transient of a sound passes through unaffected.

Release determines how soon the compressor returns to its

normal gain once the trigger signal level drops below the thresh-

old. If the release time is too short, the gain will recover too

quickly causing level pumping — noticeable gain ﬂuctuations. If

it is set too long, the compressor may not have time to recover

before the next high level signal appears, and it will be com-

pressed incorrectly.

Out Gain (GAIN) sets the compressor’s output signal level.

Compression tends to reduce the average signal level. Out Gain

can be used to counter this level reduction and set an appropri-

ate level for the next stage in the audio path.

Knee sets the transition of the signal at the threshold. With a

hard knee, the transition between uncompressed and com-

pressed signal is immediate. With the softest knee, knee5, the

transition starts before the signal reaches the threshold and

gradually ends above the threshold.

Compressor

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Input Level

Output Level

Knee = hard

Threshold = -20dB

Compression ratio = 2:1

-60 -40 -20

A compressor provides a form of automatic level control. By attenuating high

levels, thus effectively reducing the dynamic range, the compressor makes it

much easier to control signals and set appropriate fader levels. Reducing the

dynamic range also means that recording levels can be set higher, therefore

improving the signal-to-noise performance.

Expander

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Input Level

Output Level

Threshold = -10dB

Knee = hard

Expansion ratio = 2:1

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Input Level

Output Level

Threshold = -20dB

Knee = knee5

Expansion ratio = 2:1

-60 -40 -20

An expander is another form of automatic level control. By attenuating the signal below the threshold, the expander

reduces low-level noise and effectively increases the dynamic range of the recorded material.

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