Copley amplifier parameter dictionary - Maccon.de

Copley Amplifier Parameter Dictionary Filter Coefficients
For the plus family of drives (Xenus+, AEM, etc), a new format is used to describe the biquad filter coefficients. These drives include the
ability to design the filters in firmware using the Cephes filter design library.
Filters on this family of drives are calculated internally using 32-bit IEEE floating point coefficients. The format of the parameter information
passed when setting filter parameters on these drives consists of an array of up to fourteen 16-bit words. The first 4 words describe the filter,
and the remaining 10 words give the filter coefficients as 32-bit IEEE floating point values. The filter coefficient words are optional and are
only necessary if the firmware is not calculating the coefficients internally.
Word Description
1 Bit Usage
0-3 Filter family.
4 If set, filter will not be designed. Always set by firmware after successfully designing the
filter. This prevents the filter from being redesigned when copied from flash at startup.
5-7 Reserved.
8 Number of poles – 1 (i.e. 0 for single pole, 1 for two pole).
9-12 Reserved.
13-15 Filter type.
All reserved bits should be set to zero.
The filter family should be one of the following values:
0 Custom biquad filter. Coefficients must be passed; the firmware will not design the filter.
1 Butterworth filter.
2 Chebychev filter.
3 Elliptic filter.
4-15 Reserved.
The filter type should be one of the following:
0 Custom biquad filter. Coefficients must be passed; the firmware will not design the filter.
1 Low pass.
2 High pass.
3 Band reject (notch).
4 Band pass.
5-6 Reserved
Copley Controls Page 66