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