BSS Audio FDS 355 Specifications download pdf (Page 45)

The crossover filters and EQs share DSP resources between two 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

Outputs 3-6

EQ*

DSP 1 18 All None All All Second

DSP 2 20 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 18 filters in DSP 1, and 20 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.

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 (18-4)= 14 filters left in DSP 1 for either Input EQ or Outputs 1 & 2 EQ.

 There is a total of (20-12)= 8 filters left in DSP 2 for any Output EQ.

DSP Filter/EQ Assignment

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 53 54

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BSS Audio FDS 355 Specifications Page 45