信号操作
R2026a对信号执行延迟、重新排序、重采样和加窗操作
您可以使用 DSP System Toolbox™ 中的模块和 System object 执行信号操作，如速率转换、卷积、数字上变频和数字下变频、相位提取、DC 分量去除、峰值定位、信号填充和延迟加法。
对象
模块
 | Downsample | Resample input at lower rate by deleting samples |
 | Digital Down-Converter | Translate digital signal from intermediate frequency (IF) band to baseband and decimate it |
 | Digital Up-Converter | Interpolate and translate digital signal from baseband to intermediate frequency (IF) band |
 | Farrow Rate Converter | Polynomial sample-rate converter with arbitrary conversion factor |
 | Interpolation | Interpolate values of real input samples |
 | Repeat | Resample input at higher rate by repeating values |
 | Sample and Hold | 采样和保持输入信号 |
 | Sample-Rate Converter | Multistage sample-rate conversion |
 | Upsample | Resample input at higher rate by inserting zeros |
 | Convolution | 两个输入项的卷积 |
 | DC Blocker | Block DC component |
 | Detrend | 从向量中去除线性趋势 |
 | Truncate | Truncate vectors by removing or keeping beginning or ending values |
 | Pad | Pad or truncate specified dimension(s) |
 | Parameter Smoother | Smooth input parameters using exponential smoothing (自 R2024a 起) |
 | Peak Finder | Determine whether each value of input signal is local minimum or maximum |
 | Phase Extractor | Extract the unwrapped phase of a complex input |
 | Unwrap | Unwrap signal phase |
 | Window Function | Compute and apply window to input signal |
 | Zero Crossing | Count number of times signal crosses zero in single time step |
 | Variable Integer Delay | 按固定或可变采样周期延迟输入信号 |
 | Variable Fractional Delay | Delay input by time-varying fractional number of sample periods |
主题
基于采样和基于帧的处理
- Sample- and Frame-Based Concepts
Explore basic signal concepts in the context of a Simulink® model. Learn more about sample-based processing and frame-based processing. - Inspect Sample and Frame Rates in Simulink
Understand sample time, sample rate, frame period, 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. - Compare Speed Performance in Frame-Based Processing Mode Using Simulink Profiler
Process signals using frame-based processing and compare the performance using Simulink profiler.
速率转换
- Upsample Signal in Single-Rate Frame-Based Processing Mode
Upsample signal in the single-rate processing mode. - Upsample Signal in Multirate Frame-Based Processing Mode
Upsample signal in multirate frame-based processing mode. - 采样和保持信号
显示不同触发事件对 Sample and Hold 模块输出的影响。 - Repeat Signal in Single-Rate Frame-Based Processing Mode
Repeat the signal in single-rate processing mode. - Repeat Signal in Multirate Frame-Based Processing Mode
Repeat the signal in multirate frame-based processing mode.
信号操作
- Generate and Apply Hamming Window
Generates and applies a Hamming window using Window Function block. - Unwrap Signal
This model shows basic unwrapping using the Unwrap block. - 两个输入项的卷积
此模型说明如何使用 Convolution 模块对两个向量求卷积。 - Pad or Truncate Matrix with Constant Values
Use the Pad block to pad or truncate constant values to a matrix. - 提取正弦波的相位
使用 Phase Extractor 模块提取正弦波信号的相位。 - Use DC Blocker to Remove DC Component of Signal
Remove DC component of signal using IIR and Subtract mean estimation algorithms. - DC Blocker with Fixed Point Data
Use DC Blocker block to remove DC offset from fixed-point data. - Truncate Data Vector Using Offset Block
Truncate data vector using Offset block in all the four modes. - Detect Number of Zero Crossings in Signal
Detect number of zero crossings using Zero Crossing block. - Find Peak Values in a Signal
Shows the analysis made by the Peak Finder block while processing an input vector. - Effect of Overflow Mode on Peak Finder Output
Effect of saturate on integer overflow parameter on the Peak Finder output.
延迟和时滞
- Delay and Latency
Configure the Simulink environment to minimize delay and increase simulation performance. - Delay Signal Using Multitap Fractional Delay
Concurrently delay an input signal using multiple taps.
可变大小信号支持
- 可变大小信号基础知识 (Simulink)
创建一个大小和值在仿真期间可能会发生变化的可变大小信号。 - Variable-Size Signal Support DSP System Objects
List of System objects that support variable-sized signals in DSP System Toolbox.
相关信息
精选示例
使用法罗结构的小数延迟滤波器
此示例说明如何使用法罗结构设计数字小数延迟滤波器。数字小数延迟滤波器是微调信号采样时刻的有用工具。它们通常出现在数字调制解调器的同步中，其中延迟参数随时间变化。此示例说明为什么法罗结构是实现时变 FIR 小数延迟滤波器的流行方法。
Digital Up and Down Conversion for Family Radio Service in MATLAB
Family Radio Service (FRS) is an improved walkie talkie FM radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies in the ultra high frequency (UHF) band. Devices operating in the FRS band must be authorized under Part 95 Subpart B "Family Radio Service" (Sections 95.191 through 95.194) of the FCC rules. The authorized bandwidth of FRS channels is 12.5 KHz and the center frequency separation between channels is 25 KHz.
Digital Up and Down Conversion for Family Radio Service in Simulink
Implement Family Radio Service system using Digital Down-Converter and Digital Up-Converter blocks.
