BSS 366T OmniDrive [102/112] Filter allocations

BSS 366T OmniDrive [102/112] Filter allocations
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FDS-366T
The crossover filters and EQs share DSP resources between two Motorola 56300 DSP chips. There
are certain assignment constraints, the table below summarizes how the resources are allocated.
DSP Assignment table:
DSP Number Total Filters
Output 1&2
Crossovers
Output 3-6
Crossovers
Input EQ
Output 1&2
EQ
Outputs 3-6
EQ*
DSP 1 25 All None All All Second
DSP 2 37 None All None None First
* The EQ for outputs 3-6 may come from either DSP 1 or DSP 2, but DSP 2 filters are used first, until
all DSP 2 resources are allocated.
Summing this up in words:
There are 25 filters in DSP 1, and 37 in DSP 2.
All of the crossover filters for Outputs 1 & 2 come from DSP 1.
All of the crossover filters for Outputs 3-6 come from DSP 2.
All of the Input EQ comes from DSP 1.
All of the Output EQ for Outputs 1 & 2 comes from DSP 1.
Output EQ for Outputs 3-6 may come from either DSP.
12dB/Octave and 24dB/Octave crossovers use 2 filters per edge.
48dB/Octave crossovers use 4 filters per edge.
Stereo EQs use 2 filters each.
5 of the DSP1 filters and 4 of the DSP2 filters are always allocated to the DEQ.
For example, a stereo 3 way 12dB/octave crossover would use DSP resources as follows:
4 filters are used in DSP 1 for Output 1 & 2 crossovers high edge crossovers. (2 per 12dB/
Octave Slope).
12 filters used in DSP 2 for Output 3-6 crossovers (1 per 12dB/Octave Slope).
There is a total of (25-4)= 21 filters left in DSP 1 for either Input EQ or Outputs 1 & 2 EQ.
There is a total of (37-12)= 25 filters left in DSP 2 for any Output EQ.
25.0 Filter Allocations

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