Table Of Contents

FIR Narrowband Filtering (G Dataflow)

Version:
    Last Modified: March 15, 2017

    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.

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    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.

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    IFIR filter

    The IFIR filter.

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    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

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    interpolation

    The interpolation factor M.

    The model filter is stretched by interpolation times.

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    Model Filter

    The coefficients of the model filter.

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    Image Suppressor

    The coefficients of the filter image suppressor.

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    filtered signal

    Filtered signal.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    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:

    delay = [ ( N G 1 ) M + N I ] 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: This product does not support FPGA devices


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