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Signal Subtract

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The Subtract Block performs a subtraction operation on the input pins and outputs the difference result. (Minuend - Subtrahend = Difference)

Input Pins

NameFormat [int/dec] - [control/audio]Function Description
Input_Pin 0any - anyMinuend term
Input_Pin 1any - anySubtrahend term

Output Pins

NameFormat [int/dec] - [control/audio]Function Description
Input_Pin 0any - anyDifference term

Algorithm Description

A standard subtraction operation is performed. When the algorithm is grown new input pins appear. These input pins represent more subtrahend terms so that the resulting output formula is:
Output_Pin 0 = Input_Pin 0 - (Input_Pin1 + Input_Pin2 + Input_Pin3 + … Input_PinN)


The subtraction block can be used along with other arithmetic operators to realize many typical DSP functions. It is a basic building block that allows difference operations to be performed.

The subtraction block can also be useful when debugging a schematic project. In the following example subtraction is used to compare the output of the Crossover Filter and two separate General 2nd Order filters set-up to do a cross-over functionality. By subtracting the two “low” outputs and the two “high” outputs, you can verify that both filters are the same if the resulting output in the Readback window is 0.

Algorithm Details

Toolbox PathBasic DSP - Arithmetic Operations - Signal Subtract
Cores SupportedADAU144x
“Grow Algorithm” Supportedyes - see Algorithm Growth Information
“Add Algorithm” Supportedno
Subroutine/Loop Basedno
Program RAM3*
Data RAM1
Parameter RAM0
resources/tools-software/sigmastudio/toolbox/basicdsp/signalsubtract.1340368764.txt.gz · Last modified: 22 Jun 2012 14:39 by William Jahn