Fixed-Point Blockset

Integrator Backward

Perform discrete-time integration of a signal using the backward method

Library

Calculus

Description

The Integrator Backward block performs a discrete-time integration of a signal using the backward method. The block multiplies the input by the weighted sample time and adds the result to the cumulative sum since time zero. The block outputs the sum up to the nth time step at time n.

Remarks

The output of the Integrator Backward block differs from the output of the Integrator Forward block only by the first and last terms in the cumulative sum.

Parameters and Dialog Box

Gain value

Specify the weight by which the sample time is multiplied.

Initial condition for previous output

Set the initial condition for the previous output.

Output data type and scaling

The options are:

• Specify via dialog
• Inherit via internal rule
• Inherit via back propagation
  When Specify via dialog is selected, you can specify the Output data type and Output scaling parameters.

Round toward

Rounding mode for the fixed-point output.

Saturate to max or min when overflows occur

If selected, fixed-point overflows saturate.

Characteristics

Input Port	Any data type supported by the blockset
Output Port	Same as the input
Direct Feedthrough	Yes
Scalar Expansion	Of inputs and gain

See Also

Integrator Backward Resettable, Integrator Backward Resettable Limited, Integrator Forward, Integrator Forward Resettable, Integrator Forward Resettable Limited, Integrator Trapezoidal, Integrator Trapezoidal Resettable, Integrator Trapezoidal Resettable Limited

Integer Delay

Integrator Backward Resettable