Last Modified: March 31, 2017

Filters a signal using a bandstop FIR filter with equi-ripple characteristics. Bandstop filters attenuate a certain band of frequencies.

A Boolean that specifies the initialization of the internal state of the node.

True | Initializes the internal state to zero. |

False | Initializes the internal state to the final state from the previous call of this node. |

This node automatically initializes the internal state to zero on the first call and runs continuously until this input is True.

**Default: **False

Lower of the two passband frequencies. **lower passband frequency** must be greater than zero and observe the Nyquist criterion.

**Default: **0.2

Lower of the two stopband frequencies. **lower stopband frequency** must be greater than **lower passband frequency** and observe the Nyquist criterion.

**Default: **0.25

Number of taps in the FIR filter.

**Default: **33

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.

**Default: **No error

Sampling frequency in Hz. **sampling frequency** must be greater than zero.

This input is available only if you wire one of the following data types to **signal**:

- Double-precision, floating-point number
- Complex double-precision, floating-point number
- 1D array of double-precision, floating-point numbers
- 1D array of complex double-precision, floating-point numbers
- 2D array of double-precision, floating-point numbers

**Default: **1, which is the normalized sampling frequency

Higher of the two passband frequencies. **higher passband frequency** must be greater than **higher stopband frequency** and observe the Nyquist criterion.

**Default: **0.4

Higher of the two stopband frequencies. **higher stopband frequency** must be greater than **lower stopband frequency** and observe the Nyquist criterion.

**Default: **0.35

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

**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.

The first passband region of the filter goes from zero frequency to the lower passband frequency. The stopband region goes from the lower stopband frequency to the higher stopband frequency. The second passband region goes from the higher passband frequency to the Nyquist frequency.

**Where This Node Can Run: **

Desktop OS: Windows

FPGA: This product does not support FPGA devices