버전
(See the Wwise Tremolo Properties below.)
The Wwise Tremolo plug-in modulates the amplitude of the input signal with an unipolar carrier signal. The carrier's characteristics, like frequency and waveform type, are defined in the "LFO" section of the plug-in's properties.
The amount of modulation, or "depth", can also be specified. The figure below illustrates a signal modulated by a rectangle waveform carrier with two different amounts of modulation.
Some carrier waveforms have intrinsic second order discontinuities (triangle), first order discontinuities (rectangle), or both (sawtooth). The discontinuities may produce undesirable artifacts in the resulting signal, especially at higher frequencies. You can smooth these discontinuities by using the LFO section's smoothing parameter. It applies a low-pass filter to the LFO signal, mapped from 0 to 100% by an exponential function from Nyquist to the LFO's fundamental frequency. The following figure shows a rectangle carrier signal with different smoothing.
The Wwise Tremolo plug-in contains a series of properties, many of which can be edited in real-time and can be mapped to specific Game Parameters using RTPCs. Other properties may be changed using RTPCs, but are only relevant when the Effect starts processing, like the initial phase for example.
The initial phase properties are used to slide the carrier signal in time. You can also specify phase for channels relative to each other, using the spread and spread mode properties. For example, with a 180 degree spread and a Left-Right spread mode, you can transform the Tremolo plug-in into an auto-pan Effect.
Typical frequencies used with a tremolo are in the sub audio range (0.02 to 20 Hz). However, the plug-in also allows using audio frequencies, producing an effect that is akin to ring modulation.
Interface Element |
Description |
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Inclusion
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Determines whether the element is included or excluded. When selected, the element is included. When unselected, the element is not included. By default, this applies across all platforms. Use the Link indicator (to the left of the check box) to determine or to set platform-specific customizations. When this option is unselected, the property and behavior options in the Property Editor become unavailable. |
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Name |
The name of the Effect instance. Effect instances are a group of effect property settings. They can be one of two types: custom instances or ShareSets. Custom instances can be used by only one object, whereas ShareSets can be shared across several objects. |
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Effect |
The type of effect. |
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Shared by (Used by) |
A list of objects that currently subscribe to the selected ShareSet. This field is called “Used by” when editing a custom instance of the Effect. |
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Opens a search field where standard alphanumeric entries filter out unmatching elements from the view. Learn more in Using Tables. Click the Close icon to the left of the search icon to close the search field and remove the filter.
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Returns the Effect property settings to their default values. This option is only available when editing a custom instance of the Effect. |
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Notes |
Additional information about the Effect. |
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Effect Settings | ||||||
LFO Section | ||||||
Depth |
Amount of amplitude modulation applied to the input signal, in percentage. At 0%, the input signal passes through unchanged. At 100%, the signal is modulated to its full range. Default Value: 100 |
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Frequency |
Frequency of the modulating signal. Default Value: 1 |
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Waveform |
Shape of the modulating signal. Note: Although this parameter can be changed at run-time via RTPC, the signal is not guaranteed to be continuous. Values: Sine, Square, Triangle, Upward sawtooth, Downward sawtooth. |
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Smoothing |
Amount of smoothing applied to the modulating signal. It is low-pass filtered by a certain value, mapped from 0 to 100%. At 0%, the signal comes out intact. With higher values, edges and discontinuities are smoothed. Note: This setting has no effect on the sine waveform. Default Value: 0 |
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PWM (Pulse Width Modulation) |
Applies to the square waveform only. Modulates the width of the pulse during one cycle. At 50%, the signal is at its full amplitude for half of the cycle, and is 0 for the other half. Near 100%, the signal is at its full amplitude for almost all the cycle, while it drops to 0 for a very short amount of time. Default Value: 50 |
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Initial Phase Section | ||||||
Offset |
Offsets phase of the modulating signal of all channels by a specific value. Note: Although this parameter can be changed at run-time using RTPCs, it has no effect when it is set after the instance of this effect has started playing. Default Value: 0 |
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Spread Mode |
Defines how initial phase spread (see parameter "Spread") is applied across channels. For example, with spread mode set to "Front-Rear", all front channels start playing with a phase equal to 0, and all rear channels start playing with a phase equal to "Spread". If present (and processed), the LFE channel is always synchronized with the Front Left channel. Note: Although this parameter can be changed at run-time via RTPC, it has no effect when it is set after the instance of this effect has started playing. Values:
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Spread |
Amount of divergence in initial phase spread across channels. The way in which this value affects each channel depends on the spread mode. Note: Although this parameter can be changed at run-time using RTPCs, it has no effect when it is set after the instance of this effect has started playing. Default Value: 0 |
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Output section | ||||||
Gain |
Gain to apply to modulated signal. Default Value: 0 |
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Process Center |
Indicates whether the center channel (if present) is modulated or passed through. The center channel is only present in 3.x and 5.x configurations. |
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Process LFE |
Indicates whether the LFE channel (if present) is modulated or passed through. The LFE channel is only present in X.1 configurations. |
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