Version:

Last Modified: March 31, 2017

Filters a signal using a lowpass FIR filter with equi-ripple characteristics. Lowpass filters pass low frequencies and attenuate high 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

The frequency of the passband. **passband frequency** must be greater than zero and observe the Nyquist criterion.

**Default: **0.2

The frequency of the stopband. **stopband frequency** must be greater than **passband frequency** and observe the Nyquist criterion.

**Default: **0.25

Number of taps in the FIR filter.

**Default: **32

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

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 passband of the filter goes from zero frequency to the passband frequency. The transition band goes from the passband frequency to the stopband frequency. The stopband goes from the stopband frequency to the Nyquist frequency.

**Where This Node Can Run: **

Desktop OS: Windows

FPGA: This product does not support FPGA devices