Overview
Slew rate limiter
Discussion
Slew rate limiter that restricts the rate of change of a signal. The module computes the derivative of a signal and limits positive values to .maxSlew and minimum values to .minSlew. This mimics slew rate limiting that occurs in analog amplifiers.
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The .reset flag forces the output value to match the input value. This temporarily stops slew rate limiting for 1 sample period. By default, .reset=1 when the module is constructed. This causes the module to start in a converged state (no slew limiting on the first sample). Otherwise, if you set .reset=0 before the module is built it causes the module output to start at 0 and apply slew limiting immediately.
Type Definition
| Code Block |
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typedef struct _ModuleSlewRateLimiter
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
INT32 units; // Specifies the units for the minSlew and maxSlew variables (0=sample, 1=msec, 2=sec)
FLOAT32 minSlew; // Minimum allowed slew rate
FLOAT32 maxSlew; // Maximum allowed slew rate
INT32 reset; // Forces the output to equal the input
FLOAT32 minSlewSample; // Minimum allowed slew rate per sample
FLOAT32 maxSlewSample; // Maximum allowed slew rate per sample
FLOAT32* state; // State variables. One per channel
} ModuleSlewRateLimiterClass; |
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
units | int | parameter | 0 | 2 | 0:2 | |
minSlew | float | parameter | 0 | -100 | Unrestricted | |
maxSlew | float | parameter | 0 | 100 | Unrestricted | |
reset | int | parameter | 0 | 1 | Unrestricted | |
minSlewSample | float | derived | 1 | -0.002083 | Unrestricted | |
maxSlewSample | float | derived | 1 | 0.002083 | Unrestricted | |
state | float* | state | 1 | [1 x 1] | Unrestricted |
Pins
Input Pins
Name: in
Description: Input signal
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Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: Output signal
Data type: float
MATLAB Usage
File Name: slew_rate_limiter_module.m
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