Effects Description: Heather Eakin
The effects component has four different effects that may be applied to the audio input. These effects are echo, chorus, flanging, and ring modulation with sinusoid. For the effects component the following variables need to be defined: wet, delay, depth, and rate. Each of these components are further described below. The wet variable should be initialized to a value between 0 and 1 and is the percentage of audio that the specified effect is applied to. Zero cancels out the effect and one causes the effect to fully play canceling out the clean input signal.
ECHO:
This effect creates a delay of the given input and includes feedback to create an echo. For a good echo the wet value should remain one. The delay should be 100 ms or more, which would be achieved with the delay variable being set to a value of 0.1. Echo does not use the depth or rate variables.
CHORUS:
This effect creates a chorus using a variable delay of the given audio. The variable delay causes the audio to sound as if multiple instruments are playing by giving some short echo and pitch changes. There is no feedback with this effect. The delay should be between 20 and 30 ms. The delay should be set between 0.02 and 0.03. The depth changes the range of the delay change and should be set to about 0.005. The rate should be rather low at about 0.5. The wet variable should be set to 1.0.
FLANGING:
The flanging effect adds a whoosing sound to the audio. This is also implemented using a variable delay but also contains feedback. The flanger delay is usually between one and ten milliseconds. This would require the delay variable to be set between 0.01 and 0.001. The depth should be rather low, between 0.0005 and 0.001 with a rate of about 0.005. The wet variable should be set to 1.0.
RING MODULATION:
Ring modulation adds two audios together. For this particular effect a sine wave is being added to the given audio. This effect uses the rate variable mentioned above and should be set very high around 750. The wet variable should be set to 1.0.
Please listen to a
composition of the effects's features.
See the score file for
this composition.