Difference between revisions of "Coefficients/Potentiometers"

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[[File:Coefficients-potentiometers.png|thumb|Coefficients and assigned potentiometers are on different places on the board and put here together only for visualization.]]
 
[[File:Coefficients-potentiometers.png|thumb|Coefficients and assigned potentiometers are on different places on the board and put here together only for visualization.]]
  
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'''Coefficients''' are quantitative parameters that enter analog computations in a multiplicative fashion. Using potentiometers, coefficients can be set to any value between 0 and +1. Their output is given by <code>output = coefficient * input</code>. [[The Analog Thing]] features eight coefficient potentiometers, allowing the use of eight coefficients in an analog computation.
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'''Coefficients''' are quantitative parameters that enter analog computations in a multiplicative fashion. [[The Analog Thing]] features eight coefficient potentiometers, allowing the use of up to eight coefficients in an analog computation. Using the potentiometers, each coefficient can be set to any value between <code>0</code> and <code>+1</code>. An input to a coefficient potentiometer is multiplied by the value the coefficient potentiometer is set to such that their output is given by <code>output = coefficient * input</code>.
  
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== How to use a coefficient ==
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Five sections of the THAT user interface relate to the use of coefficient parameters:
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Say you want to compute <code>+0.5 = 0.5 * (+1)</code>. Then follow these steps:
 
  
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# First, decide which coefficient to use. They are numbered. Say you want to use number 1.
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* the COEFF section: these are inputs and output sockets
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# Put a plug into the input for coefficient 1. Connect it to some +1 source.
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* the potentiometer section
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# Put a plug into the output of coefficient 1 and use it wherever you want.
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* the MODE selector
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# Tune the potentiometer to the middle/center, around 0.5
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* the COEFFICIENT selector
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* the digital voltmeter
  
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== How to fine-tune a potentiometer ==
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To familiarize yourself with the use of coefficient potentiometers, follow these steps:
  
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THAT offers the <code>COEFF</code> [[mode]] for fine-tuning coefficients. In this mode, the [[Voltmeter]] displays the exact value of the meter position of the potentiometer chosen in the coefficient plug (highlighted in red).
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# Set the <code>MODE</code> selector to position <code>COEFF</code>.
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# Set the <code>COEFFICIENT</code> selector to <code>1</code>.
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# Use a patch cable to connect one of the <code>+1</code> output jacks in the <code>-1 / +1</code> section to the input (circle) associated with potentiometer 1 in the <code>COEFF</code> section.
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# Change the position of the <code>COEFF 1</code> knob in the potentiometer section and observe the value displayed on the digital voltmeter. The displayed value is available at the output (triangle) associated with potentiometer 1 in the <code>COEFF</code> section.
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# Remove the patch cable plug from the <code>+1</code> output jack in the <code>-1 / +1</code> section and plug it into one of the <code>-1</code> output jacks in in the <code>-1 / +1</code> section.
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# Again, change the position of the <code>COEFF 1</code> knob in the potentiometer section and observe the value displayed on the digital voltmeter.
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# Set the <code>COEFFICIENT</code> selector to any one of the other potentiometers (say, 4).
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# Use a patch cable to connect either of the <code>-1</code> jacks in the <code>-1 / +1</code> section with the input (circle) associated with the with the coefficient potentiometer you have chosen using the <code>COEFFICIENT</code> selector (say, 4).
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# Change the position of the <code>COEFF</code> knob associated with the coefficient you have chosen using the <code>COEFFICIENT</code> selector (say, 4) and observe the value displayed on the digital voltmeter.
  
 
[[File:Coefficients Howto.png|thumb|left|400px|How to use coefficients: Different blocks highlighted on [[The Analog Thing]] front panel]]
 
[[File:Coefficients Howto.png|thumb|left|400px|How to use coefficients: Different blocks highlighted on [[The Analog Thing]] front panel]]
  
 
[[Category:Components of The Analog Thing]]
 
[[Category:Components of The Analog Thing]]

Revision as of 11:58, 4 August 2021

Coefficients and assigned potentiometers are on different places on the board and put here together only for visualization.

Coefficients are quantitative parameters that enter analog computations in a multiplicative fashion. The Analog Thing features eight coefficient potentiometers, allowing the use of up to eight coefficients in an analog computation. Using the potentiometers, each coefficient can be set to any value between 0 and +1. An input to a coefficient potentiometer is multiplied by the value the coefficient potentiometer is set to such that their output is given by output = coefficient * input.

Five sections of the THAT user interface relate to the use of coefficient parameters:

  • the COEFF section: these are inputs and output sockets
  • the potentiometer section
  • the MODE selector
  • the COEFFICIENT selector
  • the digital voltmeter

To familiarize yourself with the use of coefficient potentiometers, follow these steps:

  1. Set the MODE selector to position COEFF.
  2. Set the COEFFICIENT selector to 1.
  3. Use a patch cable to connect one of the +1 output jacks in the -1 / +1 section to the input (circle) associated with potentiometer 1 in the COEFF section.
  4. Change the position of the COEFF 1 knob in the potentiometer section and observe the value displayed on the digital voltmeter. The displayed value is available at the output (triangle) associated with potentiometer 1 in the COEFF section.
  5. Remove the patch cable plug from the +1 output jack in the -1 / +1 section and plug it into one of the -1 output jacks in in the -1 / +1 section.
  6. Again, change the position of the COEFF 1 knob in the potentiometer section and observe the value displayed on the digital voltmeter.
  7. Set the COEFFICIENT selector to any one of the other potentiometers (say, 4).
  8. Use a patch cable to connect either of the -1 jacks in the -1 / +1 section with the input (circle) associated with the with the coefficient potentiometer you have chosen using the COEFFICIENT selector (say, 4).
  9. Change the position of the COEFF knob associated with the coefficient you have chosen using the COEFFICIENT selector (say, 4) and observe the value displayed on the digital voltmeter.
How to use coefficients: Different blocks highlighted on The Analog Thing front panel
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