Component: Filter (DSP)

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Author Matrix Ltd
Version 1.3 (Release)
Category DSP


Contents

Image Filter component

Filter component to allow basic filtering to be performed Filters include: LowPass, HighPass, BandPass, BandStop, FIR, IIR

Examples

Low Pass Filter

Example of the filter component set up to create a low pass filter with the input frequency controlled using the potentiometer on the panel. FC6 Icon.png LowPassFilter Low pass filter running at a low frequency - note that the amplitude of the filtered data closely matches that of the original waveform data.

LPFilter.jpg


Low pass filter running at a high frequency - note that the amplitude of the filtered waveform is now greatly attenuated.

LPFilter2.jpg


High Pass Filter

Example of the filter component set up to create a high pass filter with the input frequency controlled using the potentiometer on the panel. FC6 Icon.png HighPassFilter High pass filter running at a low frequency - note that the amplitude of the filtered waveform is greatly attenuated.

HPFilter.jpg


High pass filter running at a high frequency - note that the amplitude of the filtered data closely matches that of the original waveform data.

HPFilter2.jpg


Band Pass Filter

Example of the filter component set up to create a band pass filter with the input frequency controlled using the potentiometer on the panel. FC6 Icon.png BandPassFilter Band pass filter running at a low frequency - note that the amplitude of the filtered waveform is greatly attenuated.

BPFilter.jpg


Band pass filter running at a mid frequency - note that the amplitude of the filtered data closely matches that of the original waveform data.

BPFilter2.jpg


Band pass filter running at a high frequency - note that the amplitude of the filtered waveform is greatly attenuated.

BPFilter3.jpg

Downloadable macro reference

Filter

Performs the filter operation to the contents of the entire buffer in one go.

Parameters

This macro has no parameters


Return value

This call does not return a value


FilterTick

Performs the filter operation to the current value in the buffer.

Parameters

This macro has no parameters


Return value

This call does not return a value


Simulation macro reference

This component does not contain any simulation macros


Property reference

Buffer Manager

This property is of type Fixed list of ints and can be referenced with the variable name buffer_manager.

Determines which buffer manager component to refer to

Input

This property is of type Fixed list of ints and can be referenced with the variable name input_a.

Specifies the input buffer which will pass values into the filter

Output

This property is of type Fixed list of ints and can be referenced with the variable name output_c.

Specifies the output buffer which will store values from the filter

Type

This property is of type Fixed list of ints and can be referenced with the variable name type.

Specifies the filter type created by the component:

Low Pass - Filters out frequencies above the cutoff frequency

High Pass - Filters out frequencies below the cutoff frequency

Band Pass - Combination of High Pass and Low Pass Filters

Band Stop - Inverse of Band Pass

FIR - Finite impulse response using standard filter coefficients

IIR - Infinite impulse response using standard filter coefficients

Order

This property is of type Fixed list of ints and can be referenced with the variable name order.

Number describing the highest exponent in the numerator or denominator of the transfer function.

Coefficient A 0

This property is of type Floating point and can be referenced with the variable name co0.

Set of constants, also called tap weights, used to multiply against delayed signal sample values within a digital filter structure.

Coeffieient A 1

This property is of type Floating point and can be referenced with the variable name co1.

Set of constants, also called tap weights, used to multiply against delayed signal sample values within a digital filter structure.

Coeffieient A 2

This property is of type Floating point and can be referenced with the variable name co2.

Set of constants, also called tap weights, used to multiply against delayed signal sample values within a digital filter structure.

Coeffieient B 0

This property is of type Floating point and can be referenced with the variable name cob0.

Set of constants, also called tap weights, used to multiply against delayed signal sample values within a digital filter structure.

Coeffieient B 1

This property is of type Floating point and can be referenced with the variable name cob1.

Set of constants, also called tap weights, used to multiply against delayed signal sample values within a digital filter structure.

Sample Rate

This property is of type Floating point and can be referenced with the variable name sample_rate.

Sample frequency used to work out some basic useful calculations

Nyquist Frequency

This property is of type Floating point and can be referenced with the variable name nyquist.

Maximum theoretical frequency that can be obtained by the sample frequency

Cutt Off Frequency 0

This property is of type Floating point and can be referenced with the variable name cut_off_0.

First cutoff frequency

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