FIR Low-pass Filter Component

The FIR Low-pass Filter amplifies frequencies below a set frequency, and attenuates the frequencies above that frequency. The FIR filter offers a steeper cutoff slope than IIR filters, and can be configured to have a linear phase response.

Inputs

Audio - From another component or source. 1 to 256 inputs available

Outputs

Audio - The filtered version of the input. 1 to 256 outputs available

Controls

NOTE: When controls are changed on a design in Run mode, the output is muted (approximately 1 second) while the new coefficient set is loaded.

Control	Function	Default/Range
Bypass	Bypasses the filter.	No / Yes
Invert	Inverts the audio signal through the filter.	Normal/Inverted
Mute	Mutes the output of the filter.	Unmuted/Muted
Gain (dB)	Controls the gain of the audio signal for the frequencies passed through the filter.	Default = 0 Range = -100 to 20
Frequency (Hz)	Sets the low end of the frequencies passed through the filter. Frequencies above this setting are passed.	Default = 1,000 Range = 20 to 20,000
Group Delay (ms)	The time it takes for an audio signal to travel through the filter.	Default = 4.81 ms Range = 240 to 0.250
Response Graph	The scales for the Response Graph vary depending on the measurement method you select. The vertical line of the crosshair cursor provides a readout of its position on the X axis scale. The vertical movement of the horizontal crosshair follows the magnitude or amplitude of the signal.	N/A
Phase	The phase difference between the output of the filter and its input.	N/A

Properties

General

Property	Function	Choices
Transition Bandwidth (Octave)	Sets the bandwidth of the transition between the stopped frequencies and the passed frequencies.	1 1/2 1/4 Custom =.25 to 1.0
Stop-band Attenuation (dB)	Sets the attenuation level for the frequencies that are not passed.	40 60 80 100 Custom = 40 to 100
Phase Response	Linear Phase - The delay is the same for all frequencies. Minimum Phase - There is a minimal delay that varies with frequency.	Linear Phase Minimum Phase

Property

Function

Choices

Transition Bandwidth

(Octave)

Sets the bandwidth of the transition between the stopped frequencies and the passed frequencies.

1/2

1/4

Custom =.25 to 1.0

Stop-band Attenuation

(dB)

Sets the attenuation level for the frequencies that are not passed.

100

Custom = 40 to 100

Phase Response

Linear Phase - The delay is the same for all frequencies.

Minimum Phase - There is a minimal delay that varies with frequency.

Linear Phase

Minimum Phase

Channels

Property	Function	Choices
Type	Sets the type of Channel input and output.	Mono Stereo Multi-channel
Count	When Multi-channel Type is selected, you can select from 2 to 256 channels.	2 to 256

Property

Function

Choices

Type

Sets the type of Channel input and output.

Mono

Stereo

Multi-channel

Count

When Multi-channel Type is selected, you can select from 2 to 256 channels.

2 to 256

Response Panel

Property	Function	Choices
Enabled	Determines if the Response Panel is visible in the Control Panel	Yes / No
Size	Determines the size of the Response Panel.	Small Medium Large

Property

Function

Choices

Enabled

Determines if the Response Panel is visible in the Control Panel

Yes / No

Size

Determines the size of the Response Panel.

Small

Medium

Large

Control Pins

The available Control Pins depend on settings in Properties.

Pin Name	Value	String	Position	Pins Available
Bypass	0 1	active bypass	0 1	Input / Output
Invert	0 1	normal invert	0 1	Input / Output
Mute	0 1	unmute mute	0 1	Input / Output
Gain	-100 to 20	-100 dB to 20 dB	0.000 to 1.00	Input / Output
Frequency	10.0 to 20,000	10 Hz to 20 kHz	0.000 to 1.00	Input / Output
Group Delay	0.250 to 240	.250 ms to 240 ms	0.000 to 1.00	Output