Manual AAS Tassman 4 (page 116 of 177) (English)

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6.58 Phaser 116

Figure 62: Panpot modulated by LFO.

The default value of the following parameters is set at construction

• Angle: default source position. A value of 0 positions the source on the left, 0.5 in the middle

and 1 on the right.

• Range: determines the maximum possible amount of source excursion from its original po-

sition, varies between 0 and 0.5 (90 degrees).

6.58 Phaser

The Phaser module implements the effect known as “phasing” which

colors a signal by removing frequency bands from its spectrum. The effect

is obtained by changing the phase of the frequency components of a signal

using an all-pass ﬁlter and adding this new signal to the original one. This

module has two inputs and one output. The ﬁrst input is the audio signal

to be phased and the second input is a modulation signal that varies the

phase variations introduced in the spectrum of the ﬁrst input signal. The

output is the phased signal.

The algorithm implemented in this module is shown in Figure 63. The

input signal is sent into a variable fourth order all-pass ﬁlter. This “wet” signal is then mixed down

with the original “dry” signal. A feedback line allows the resulting signal to be re-injected into the

ﬁlter. The effect of the Phaser module is to introduce rejection in the spectrum of the input signal

depending on the tuning of the ﬁlter.

The all-pass ﬁlter modiﬁes a signal by delaying its frequency components with a delay which

increases with the frequency. This phase variations will introduce a certain amount of cancellation

when this “wet” signal is mixed down with the original “dry” signal as shown in Figure 64. The

rejection is maximum when the phase delay is equal to 180 degrees and a given component is out of

phase with that of the original signal. The amount of effect is determined by the ratio of “wet” and

“dry” signal mixed together as shown in Figure 64. As the amount of “wet” signal sent to the output

is reduced, the amount of rejection increases. The shape of the frequency of the Phaser module is

also inﬂuenced by the amount of “wet” signal re-injected into the feedback loop. Increasing the

feedback enhances frequency components least affected by the all-pass ﬁlter. As the feedback is

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AAS Tassman 4 Manual

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