Transfer Fcn Direct Form II

Implement Direct Form II realization of transfer function

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  • Library:

  • Simulink / Additional Math & Discrete / Additional Discrete

  • Transfer Fcn Direct Form II block

Description

The Transfer Fcn Direct Form II block implements a Direct Form II realization of the transfer function that the Numerator coefficients and Denominator coefficients excluding lead parameters specify. The block supports only single input-single output (SISO) transfer functions.

The block automatically selects the data types and scalings of the output, the coefficients, and any temporary variables.

Ports

Input

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Input signal, specified as a scalar or vector.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | fixed point

Output

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Output signal, specified as a scalar or vector.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | fixed point

Parameters

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Specify the numerator coefficients as a vector.

Programmatic Use

Block Parameter: NumCoefVec
Type: character vector
Values: vector
Default: '[0.2 0.3 0.2]'

Specify the denominator coefficients, excluding the leading coefficient, which must be 1.0.

Programmatic Use

Block Parameter: DenCoeffVec
Type: character vector
Values: vector
Default: '[-0.9 0.6]'

Specify the initial condition as a scalar.

Programmatic Use

Block Parameter: vinit
Type: character vector
Values: scalar
Default: '0.0'

Specify the rounding mode for fixed-point operations. For more information, see Rounding (Fixed-Point Designer).

Programmatic Use

Block Parameter: RndMeth
Type: character vector
Values: 'Ceiling' | 'Convergent' | 'Floor' | 'Nearest' | 'Round' | 'Simplest' | 'Zero'
Default: 'Floor'

When you select this check box, overflows saturate to the maximum or minimum value that the data type can represent. Otherwise, overflows wrap.

When you select this check box, saturation applies to every internal operation on the block, not just the output or result. In general, the code generation process can detect when overflow is not possible. In this case, the code generator does not produce saturation code.

Programmatic Use

Block Parameter: DoSatur
Type: character vector
Values: 'off' | 'on'
Default: 'off'

Model Examples

Fixed-Point Filters

Fixed-Point Filters

Bit-true implementations of fixed-point direct type I and II filters with time-varying and time-invariant coefficients. These filters use the fundamental capabilities in Fixed-Point Designer™ and work with the autoscaling tools.

Block Characteristics

Data Types

double | fixed point | integer | single

Direct Feedthrough

no

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

Extended Capabilities

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

See Also

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Topics

Introduced before R2006a

Simulink Documentation

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