多重速率的过滤器是变化的数字滤波器the sample rate of a digital signal without introducing aliasing or imaging in the rate-converted signal. These filters are categorized as decimators that reduce the sample rate, interpolators that increase the sample rate, and rate converters that do a combination of both. For details on these rate conversion operations and their effect on the signal in time and frequency domains, seeOverview of Multirate Filters. DSP System Toolbox™ offers several MATLAB®System objects and Simulink®blocks that implement decimators, interpolators, and rate converters. Advanced filter technologies such as channelizers, channel synthesizers, two-channel halfband filter banks, and multilevel filter banks use these filters as building components.
You can implement a multirate filter with a large rate conversion factor in two or more stages rather than in one single stage. When the design is long (contains many coefficients) and costly (requires many multiplications and additions per input sample), the multistage approach is more efficient to implement compared to the single-stage approach. For more details, seeOverview of Multistage Filters.
ThedesignMultistageDecimator
anddesignMultistageInterpolator
functions in DSP System Toolbox automatically determine the optimal configuration of the filter, which includes determining the number of stages and the rate conversion factor for each stage. An optimal configuration leads to the least computational effort and you can measure the cost of such an implementation using thecost
function. For an example, seeMultistage Rate Conversion.
Inspect Sample and Frame Rates in Simulink
了解样品时间,采样率,帧期间,and frame rate in the context of a Simulink model. Determine the sample and frame rates of signals in your model.
Convert Sample and Frame Rates in Simulink Using Rate Conversion Blocks
Learn how direct-rate conversion blocks impact the sample rate and frame rate of signals in Simulink models.
Convert Sample and Frame Rates in Simulink Using Frame Rebuffering Blocks
Learn how frame rebuffering blocks impact the sample rate and frame rate of signals in Simulink models.
Define multirate filters and understand decimation and interpolation. Understand aliasing and imaging and ways to avoid them.
Design of Decimators and Interpolators
This example shows how to design filters for decimation and interpolation of discrete sequences.
Multirate Filtering in MATLAB and Simulink
Perform multirate filtering using rate conversion objects and blocks.
FIR Nyquist (L-th band) Filter Design
This example shows how to design lowpass FIR Nyquist filters.
Overview of Multistage Filters
Different types of multistage filters and their uses. Learn how to implement decimators and interpolators using the multistage approach.
Design multistage rate conversion filters.
Provides an overview of the channelizer, channel synthesizer, and the two-channel filter bank.
Two-Channel Filter Bank Using Halfband Decimators and Halfband Interpolators
Implement a two-channel filter bank using the FIR and IIR halfband filters. Compare the implementation cost and group delay.
Channelize and Synthesize Sine Wave in MATLAB
Channelize and synthesize sinusoidal signal in MATLAB.
Synthesize and Channelize Audio in Simulink
Synthesize and channelize audio signals.
Understand dyadic analysis and dyadic synthesis multilevel filter banks.
Calculate Channel Latencies Required for Wavelet Reconstruction
Learn how to calculate the latencies required for perfect wavelet reconstruction.
Model Multirate Signal Processing Systems Using Dataflow
Use aDataflow Subsystemto automatically calculate frame sizes in multirate systems.
Time-Based Scheduling and Code Generation(Simulink Coder)
Generate code that meets real-time execution requirements after reviewing sample time and tasking mode considerations.
Configure the Simulink environment to minimize delay and increase simulation performance.