Overview
Audio sample decimator with IIR filter
Discussion
The IIR decimator subsystem implements an IIR filter followed by a downsampler. IIR low-pass filter is realized by adding allpass pair subsystem output. Vaiable cutoffFreq must be smaller than Fs*0.5/D, where Fs is a sampling rate and D is a decimation factor
The block size of the input pin must be divisible by the decimation factor D. The output block size equals the input block size divided by D. The output sample rate equals the input sample rate divided by D.
Type Definition
-Not Shown-
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
cutoffFreq | float | parameter | 0 | 10800 | 20:24000 | Hz |
Rs | float | parameter | 0 | 60 | 10:100 | dB |
D | int | const | 0 | 2 | Unrestricted |
Pins
Input Pins
Name: in
Description: Audio input
...
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: Audio input
Data type: float
Scratch Pins
Channel count: 1
Block size: 32
...
Block size: 32
Sample rate: 48000
MATLAB Usage
File Name: iir_decimator_subsystem.m
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