FIR Narrowband Filtering (G Dataflow)

Filters an input sequence using a specific interpolated FIR (IFIR) filter.

Programming Patterns

You can use the FIR Narrowband Filter Design node to generate the IFIR Filter for this node.

signal

The input signal.

This input can be a 1D array of double-precision, floating-point numbers or a 1D array of complex double-precision, floating-point numbers.

IFIR filter

The IFIR filter.

filter type

Passband of the filter.

Name Description
Lowpass

Uses a lowpass filter.

Highpass

Uses a highpass filter.

Bandpass

Uses a bandpass filter.

Bandstop

Uses a bandstop filter.

Default: Lowpass

interpolation

The interpolation factor M.

The model filter is stretched by interpolation times.

Model Filter

The coefficients of the model filter.

Image Suppressor

The coefficients of the filter image suppressor.

error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: No error

Filtered signal.

error out

Error information. The node produces this output according to standard error behavior.

Algorithm for Calculating the Delay for the Filter

The overall filter is a linear-phase FIR filter. This node calculates the delay for the filter using the following equation:

$\mathrm{delay}=\frac{\left[\left({N}_{G}-1\right)M+{N}_{I}\right]}{2}$

where

• NG is the number of elements in Model Filter
• NI is the number of elements in Image Suppressor
• M is the value of interpolation

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported