Huron & SNAP Documentation

Huron & SNAP Documentation Huron & SNAP Documentation

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↓ To remove a FIR filter from the filter Program. ↓ To replace a loaded FIR filter Note: Each FIR filter in a Filter program utilises the number of DSP processors shown in the Filter Type box. The number of FIR filters which may be added to a program is limited by the number of DSP processors installed in the system. If the number of DSP processors required by the FIR filters exceeds those available, the system will return an error message and the excess filters will not be loaded. Inputs, Outputs, Mixing and Patching ↓ To mix the FIR filter outputs of a Filter program THE ENGINEERING TOOLS The filter selection window will disappear and the selected impulse response will appear as part of the Filter program (see Figure 56 below). Figure 56 — Filter program window with FIR filter added 1. Select the FIR filter. 2. On the Filter program window Click Delete. 1. Select the FIR filter to replace. 2. On the Filter program window Click Edit. 3. From the dialogue Select the replacement filter. 4. Click OK. Each FIR filter within a Filter program has one input channel and one output channel. It is possible to mix any number of outputs from these filters within the Convolver. Each time a FIR filter is added to a Filter program, the appropriate input and output patch points appear on the Convolver panel in the Patch Bay. When the outputs of the FIR filters are mixed they are combined to a single output point in the Patch Bay. 1. Select the FIR filter to be mixed from the Filter program window. 2. Click Channel. The following window will be displayed HURON TECHNICAL MANUAL PAGE 190

Currently selected patch point icon Note: It is only possible to mix downwards (in number) in the output list, thus it is possible to mix output 2 to output 1 but not output 1 to output 2 Input and Output Level Metering ↓ To display the input and output levels of a Filter program Figure 57 — Mixing Channels Fast Switching with Pre-loaded Filter Coefficients ↓ To fast switch between Filter programs THE ENGINEERING TOOLS 3. Change the current output channel by Clicking the patch point icon you wish to direct the output to. Patch points which are no longer used will disappear from the Patch Bay. 1. Select a Filter program from the Filter program window. 2. Click Meters. A level meter window will appear, each meter reflects the input and output levels of a single filter. The Convolver pre-loads Filter programs and their associated FIR filters into on board DRAM, as they are selected. When two or more Filter programs and their associated FIR filters fit into the available DRAM they can be “fast switched”. Fast switching allows two different Filter programs to be compared in close to real time. It is only possible to switch between Filter programs loaded into DRAM, the number of filters which can be loaded into DRAM simultaneously is denoted by the number of buffers available (in Table 1 — Filters available to the Convolver). A Filter program which has been pre-loaded is indicated by an asterisk (*) next to the Program Name in the Filter program list. 1. Click the first pre-loaded Filter program name. 2. Click the second pre-loaded Filter program name. HURON TECHNICAL MANUAL PAGE 191

↓ To remove a FIR filter from the<br />

filter Program.<br />

↓ To replace a loaded FIR filter<br />

Note: Each FIR filter in a Filter<br />

program utilises the number of DSP<br />

processors shown in the Filter Type<br />

box. The number of FIR filters which<br />

may be added to a program is limited<br />

by the number of DSP processors<br />

installed in the system. If the number<br />

of DSP processors required by the FIR<br />

filters exceeds those available, the<br />

system will return an error message<br />

and the excess filters will not be<br />

loaded.<br />

Inputs, Outputs, Mixing and Patching<br />

↓ To mix the FIR filter outputs of<br />

a Filter program<br />

THE ENGINEERING TOOLS<br />

The filter selection window will disappear and the selected<br />

impulse response will appear as part of the Filter program (see<br />

Figure 56 below).<br />

Figure 56 — Filter program window with FIR filter added<br />

1. Select the FIR filter.<br />

2. On the Filter program window Click Delete.<br />

1. Select the FIR filter to replace.<br />

2. On the Filter program window Click Edit.<br />

3. From the dialogue Select the replacement filter.<br />

4. Click OK.<br />

Each FIR filter within a Filter program has one input channel<br />

and one output channel. It is possible to mix any number of<br />

outputs from these filters within the Convolver. Each time a<br />

FIR filter is added to a Filter program, the appropriate input and<br />

output patch points appear on the Convolver panel in the Patch<br />

Bay. When the outputs of the FIR filters are mixed they are<br />

combined to a single output point in the Patch Bay.<br />

1. Select the FIR filter to be mixed from the Filter program<br />

window.<br />

2. Click Channel.<br />

The following window will be displayed<br />

HURON TECHNICAL MANUAL PAGE 190

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