Copley amplifier parameter dictionary - Maccon.de

Copley Amplifier Parameter Dictionary Filter Coefficients
Word Description
7 Disabled. The filter will have no effect in the system.
If legal values are passed for the filter type and family, the firmware will attempt to
design the specified filter and fill in the coefficient values itself. The firmware is
capable of calculating 1 or 2 pole low pass or high pass filters. For notch and band
pass filters the firmware can only calculate a two pole filter. For these filter types,
bit 8 must be set.
2 This word gives the cut off frequency (in Hz) for low pass and high pass filters. For notch and band
pass filters this gives the first filter frequency.
3 This word gives the second filter frequency (in Hz) for notch and band pass filters.
4 Bit Usage
0-7 Rp given in 0.1 dB units.
8-15 Rs given in dB units.
Rp is the pass band ripple. This parameter is only used for Chebychev and Elliptic filters.
Rs is only used with elliptic filters. It defines the stop band as Rs dB down from the peak value in
the pass band.
5-6 Coefficient a1. All filter coefficients are passed as 32-bit IEEE floating point numbers. The upper 32bits
should be passed first.
If the firmware designs the filter then the coefficients will be filled in by the firmware and need not be
passed.
7-8 Coefficient a2.
9-10 Coefficient b0.
11-12 Coefficient b1.
13-14 Coefficient b2.
Copley Controls Page 67