DSP Blockset

Multirate Filters

Multirate filters alter the sample rate of the input signal during the filtering process. Such filters are useful in both rate conversion and filter bank applications.

The Multirate Filters library provides a number of blocks for multirate applications:

• Dyadic Analysis Filter Bank
• Dyadic Synthesis Filter Bank
• FIR Decimation
• FIR Interpolation
• FIR Rate Conversion
• Two-Channel Analysis Subband Filter
• Two-Channel Synthesis Subband Filter

Multirate Filtering Demos

The DSP Blockset provides a collection of multirate filtering demos that illustrate typical applications of the multirate filtering blocks, listed in the following table.

Opening Demos.   To open the multirate filter demos, click on the links in the following table in the MATLAB Help browser (not in a Web browser), or type the demo names provided in the table at the MATLAB command line. To access all DSP Blockset demos, type demo blockset dsp at the MATLAB command line.

Multirate Filtering Demos	Commands for Opening Demos in MATLAB
Denoising	dspwdnois
Multistage Multirate Filtering Suite	dspmrf_menu
Interpolation of a Sinusoidal Signal	dspintrp
Sample Rate Conversion	dspsrcnv
Sigma-Delta A/D Converter	dspsdadc
Three-Channel Wavelet Transmultiplexer	dspwvtrnsmx
Wavelet Perfect Reconstruction Filter Bank	dspwpr
Wavelet Reconstruction	dspwlet

Step 7 -- Set the Vector Scope Display Colors

Adaptive Filters