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| resources:tools-software:sigmastudio:toolbox:filters:general2ndorderwvarparamlookupslew [27 Jun 2012 23:01] – added link to return to parent page William Jahn | resources:tools-software:sigmastudio:toolbox:filters:general2ndorderwvarparamlookupslew [21 Jan 2013 19:58] – double precision Jonathan Bright |
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| Chebyshev LP/HP | Chebyshev LP/HP |
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| The block is simply a biquad filter that has stored a set of coefficients in tables in the DSP. To select curves (lookup), use an [[resources:tools-software:sigmastudio:toolbox:leveldetectorslookuptables:indexlookuptable|Index Lookup Table]], a [[resources:tools-software:sigmastudio:toolbox:counters:counter|Counter]] block, or a [[resources:tools-software:sigmastudio:toolbox:sources:dcinputentry|DC Input]] block in your design and connect it to the red pin. Using the GPIO blocks you could control the selected responses with a knob, rotary encoder or button. | The block is simply a [[http://ez.analog.com/message/73876|double-precision]] biquad filter that has stored a set of coefficients in tables in the DSP. To select curves (lookup), use an [[resources:tools-software:sigmastudio:toolbox:leveldetectorslookuptables:indexlookuptable|Index Lookup Table]], a [[resources:tools-software:sigmastudio:toolbox:counters:counter|Counter]] block, or a [[resources:tools-software:sigmastudio:toolbox:sources:dcinputentry|DC Input]] block in your design and connect it to the red pin. Using the GPIO blocks you could control the selected responses with a knob, rotary encoder or button. |
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| **To open the Filter Control Window:** | **To open the Filter Control Window:** |
| The chief difference between the [[resources:tools-software:sigmastudio:toolbox:filters:general2ndorderlookup|General (2nd-Order / Lookup)]] block and this Slew version may be observed when the index changes (red pin) to select a new curve. The transition from previous curve to next curve is smooth, without any occasional zipping or clicking sounds, the reason being that the Slew version takes more memory space. As the designer, you will want to match your hardware appropriately. Consider the General (1st-Order w/ Param / Lookup / Slew) if system resources are scarce. | The chief difference between the [[resources:tools-software:sigmastudio:toolbox:filters:general2ndorderlookup|General (2nd-Order / Lookup)]] block and this Slew version may be observed when the index changes (red pin) to select a new curve. The transition from previous curve to next curve is smooth, without any occasional zipping or clicking sounds, the reason being that the Slew version takes more memory space. As the designer, you will want to match your hardware appropriately. Consider the General (1st-Order w/ Param / Lookup / Slew) if system resources are scarce. |
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| <note>Note: For n curves, the selected index shouldn't exceed n - 1, i.e., the index range is 0 to n - 1. If you select an n th curve, misbehavior or errors may result.</note> | <WRAP round help>Note: For n curves, the selected index shouldn't exceed n - 1, i.e., the index range is 0 to n - 1. If you select an n th curve, misbehavior or errors may result.</WRAP> |
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