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refine docu

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SingularitySurfer 2022-06-23 15:46:15 +00:00
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artiq/coredevice/phaser.py
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@ -133,13 +133,15 @@ class Phaser:
Each channel IIR features 4 profiles, each consisting of the [b0, b1, a1] filter
coefficients as well as an output offset. The coefficients and offset can be
set for each profile individually and the profiles each have their own filter
state. To avoid transient effects, care should be taken to not update the
coefficents in the currently selected profile.
set for each profile individually and the profiles each have their own ``y0``,
``y1`` output registers (the ``x0``, ``x1`` inputs are shared). To avoid
transient effects, care should be taken to not update the coefficents in the
currently selected profile.
The IIR output can be put on hold for each channel. In hold mode, the filter
still ingests samples and updates its input x0 and x1 registers, but does not
update the y0, y1 output registers. The servo can also be bypassed.
still ingests samples and updates its input ``x0`` and ``x1`` registers, but
does not update the ``y0``, ``y1`` output registers. The servo can also be
bypassed.
After power-up the servo is bypassed, in profile 0, with coefficients [0, 0, 0]
and hold is enabled. If older gateware without ther servo is loaded onto the