dsp.firfilter.

Static or time-varying FIR filter

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描述

Thedsp.firfilter.系统对象™使用静态或时变的FIR滤波器实现来筛选输入的每个通道。

To filter each channel of the input:

创造dsp.firfilter.对象并设置其属性。
用参数调用对象，就像它是一个函数一样。

To learn more about how System objects work, see什么是系统对象？。

在特定条件下，此系统对象还支持SIMD代码生成。万博1manbetx有关详细信息，请参阅Code Generation。

创建

Syntax

fir = dsp.FIRFilter

fir = dsp.firfilter（num）

fir = dsp.FIRFilter(Name,Value)

描述

fir= dsp.firfilter.返回有限脉冲响应（FIR）过滤器对象，fir, which independently filters each channel of the input over time using a specified FIR filter implementation.

example

fir= dsp.firfilter（num)returns an FIR filter System object,fir，与之分子property set tonum。

fir= dsp.firfilter（Name,Value)returns an FIR filter System object,fir，每个属性都设置为指定值。

特性

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除非另有说明，否则属性是不宜，这意味着在调用对象后无法更改其值。当您调用它们时，对象锁定，以及release功能解锁它们。

如果属性是调节, you can change its value at any time.

有关更改属性值的详细信息，请参阅System Design in MATLAB Using System Objects。

`Structure`—Filter structure
`Direct form`（默认）|`Direct form symmetric`|`Direct form antisymmetric`|`Direct form transposed`|`Lattice MA`

指定过滤器结构。您可以将过滤器结构指定为一个Direct form|Direct form symmetric|Direct form antisymmetric|Direct form transposed|Lattice MA。

`分子Source`—滤波器系数的来源
`Property`（默认）|`输入端口`

指定滤波器系数的源作为Property要么输入端口。When you specify输入端口，过滤器对象每帧更新一次变化过滤器。

依赖性

设置时适用Structure到Direct form|Direct form symmetric|Direct form antisymmetric|Direct form transposed。

`RELLICTIONCOEFFICERSSOURCE.`—滤波器系数的来源
`Property`（默认）|`输入端口`

指定the source of the Lattice filter coefficients asProperty要么输入端口。When you specify输入端口，过滤器对象每帧更新一次变化过滤器。

依赖性

设置时适用Structure到Lattice MA。

`分子`—分子coicients
`[0.5 0.5]`（默认）|row vector

指定the filter coefficients as a real or complex numeric row vector.

可调:是的

依赖性

This property applies when you set the分子Sourceproperty toProperty，而且Structureproperty is set toDirect form,Direct form symmetric,Direct form antisymmetric，要么Direct form transposed。

数据类型：单身的|双倍的|INT8.|int16|int32|INT64.|uint8.|uint16|UINT32|UINT64
Complex Number Support:是的

`ReflectionCoefficients`—晶格过滤器结构的反射系数
`[0.5 0.5]`（默认）|row vector

指定the reflection coefficients of a lattice filter as a real or complex numeric row vector.

可调:是的

依赖性

This property applies when you set theStructureproperty toLattice MA，而且RELLICTIONCOEFFICERSSOURCE.property toProperty。

数据类型：单身的|双倍的|INT8.|int16|int32|INT64.|uint8.|uint16|UINT32|UINT64
Complex Number Support:是的

`初始条件`—FIR滤波器的初始条件
`0`（默认）|标量|向量|matrix

指定the initial conditions of the filter states. The number of states or delay elements equals the number of reflection coefficients for the lattice structure, or the number of filter coefficients–1 for the other direct form structures.

You can specify the initial conditions as a scalar, vector, or matrix. If you specify a scalar value, the FIR filter object initializes all delay elements in the filter to that value. If you specify a vector whose length equals the number of delay elements in the filter, each vector element specifies a unique initial condition for the corresponding delay element. The object applies the same vector of initial conditions to each channel of the input signal.

If you specify a vector whose length equals the product of the number of input channels and the number of delay elements in the filter, each element specifies a unique initial condition for the corresponding delay element in the corresponding channel.

If you specify a matrix with the same number of rows as the number of delay elements in the filter, and one column for each channel of the input signal, each element specifies a unique initial condition for the corresponding delay element in the corresponding channel.

可调:是的

数据类型：单身的|双倍的|INT8.|int16|int32|INT64.|uint8.|uint16|UINT32|UINT64

Fixed-Point Properties

`FullPrecisionOverride`—全精确override for fixed-point arithmetic
`true`（默认）|`false`

指定是否使用完全精确规则。如果你设置了FullPrecisionOverride到true，这是默认情况下，对象使用完全精确规则计算所有内部算术和输出数据类型。这些规则提供了最准确的定点数字。它还关闭其他固定点属性的显示，因为它们不单独应用。这些规则保证了对象内没有量化。根据需要，添加位，以确保不会发生循环或溢出。如果你设置了FullPrecisionOverride到false, fixed-point data types are controlled through individual fixed-point property settings. For more information, seeFull Precision for Fixed-Point System Objects。

`圆形方法`—定点操作的圆形方法
`Floor`（默认）|`天花板`|`Convergent`|`Nearest`|`圆形的`|`Simplest`|`零`

指定舍入方法。

依赖性

仅当对象不处于完全精度模式时，此属性才适用。

`OverflowAction`—Overflow action for fixed-point operations
`Wrap`（默认）|`饱和`

指定the overflow action asWrap要么饱和。

依赖性

仅当对象不处于完全精度模式时，此属性才适用。

`CoefficientsDataType`—系数字和分数长度
`Same word length as input`（默认）|`Custom`

指定系数定点数据类型为Same word length as input要么Custom。

依赖性

This property applies when you set the分子Sourceproperty toProperty。

`customcoefficientsdatatyp.`—Custom coefficients word and fraction lengths
`Numerictype（真实，16,15）`（默认）|numerictype

指定the coefficients fixed-point type as a signed or unsignednumerictype(Fixed-Point Designer)目的。

依赖性

This property applies when you set theCoefficientsDataTypeproperty toCustom。

`ReflectionCoefficientsDataType`—反射系数词和分数长度
`Same word length as input`（默认）|`Custom`

指定the reflection coefficients fixed-point data type asSame word length as input要么Custom。

依赖性

This property applies when you set theRELLICTIONCOEFFICERSSOURCE.property toProperty。

`CustomReflectionCoefficientsDataType`—Custom reflection coefficients word and fraction lengths
`Numerictype（真实，16,15）`（默认）|numerictype

指定the reflection coefficients fixed-point type as a signed or unsignednumerictype(Fixed-Point Designer)目的。

依赖性

This property applies when you set theReflectionCoefficientsDataTypeproperty toCustom。

`ProductDataType`—产品字和分数长度
`全精确`（默认）|`与输入相同`|`Custom`

指定产品固定点数据类型全精确,与输入相同，要么Custom。

`CustomProductDataType.`—自定义产品单词和分数长度
`numerictype(true,32,30)`（默认）|numerictype

指定the product fixed-point type as a signed or unsigned scalednumerictype(Fixed-Point Designer)目的。

依赖性

This property applies when you set theProductDataTypeproperty toCustom。

`AccumulatorDataType`—Accumulator word and fraction lengths
`全精确`（默认）|`与输入相同`|`Same as product`|`Custom`

指定the accumulator fixed-point data type to全精确,与输入相同,Same as product，要么Custom。

`CustomAccumulatorDataType`—Custom accumulator word and fraction lengths
`numerictype(true,32,30)`（默认）|numerictype

将累加器定点类型指定为符号或无符号缩放numerictype(Fixed-Point Designer)目的。

依赖性

This property applies when you set theAccumulatorDataTypeproperty toCustom。

`StateDataType`—状态字和分数长度
`与累加器相同`（默认）|`与输入相同`|`Custom`

指定状态定点数据类型作为其中一个与输入相同,与累加器相同，要么Custom。

依赖性

This property does not apply to any of the direct form or direct form I filter structures.

`CustomStateDataType`—Custom state word and fraction lengths
`Numerictype（真实，16,15）`（默认）|numerictype

指定the state fixed-point type as a signed or unsigned scalednumerictype(Fixed-Point Designer)目的。

依赖性

This property applies when you set theStateDataTypeproperty toCustom。

`outputDatType.`—输出字和分数长度
`与累加器相同`（默认）|`与输入相同`|`Custom`

将输出定点数据类型指定为一个与输入相同,与累加器相同，要么Custom。

`customoutputdatatype.`—自定义输出字和分数长度
Numerictype（真实，16,15）（默认）|numerictype

指定the output fixed-point type as a signed or unsigned scalednumerictype(Fixed-Point Designer)目的。

依赖性

This property applies when you set theoutputDatType.property toCustom。

Usage

Syntax

y = fir(x)

y = fir(x,coeff)

描述

example

y=冷杉（x)将FIR滤波器应用于真实或复杂的输入信号x生产输出y。

y=冷杉（x,co)uses the time-varying coefficients,co, to filter the input signalxand produce the outputy。You can use this option when you set the分子Source要么RELLICTIONCOEFFICERSSOURCE.property to输入端口。

Input Arguments

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`x`—Data input
向量|matrix

Data input, specified as a vector or a matrix. When the input data is of a fixed-point type, it must be signed when the structure is set toDirect form symmetric要么Direct form antisymmetric。FIR滤波器对象在输入信号的每个通道上独立于对对象的连续呼叫操作。

This System object supports variable-size input.

数据类型：单身的|双倍的|INT8.|int16|int32|uint8.|uint16|UINT32|fi
Complex Number Support:是的

`co`—Filter coefficients
row vector

Time-varying filter coefficients, specified as a row vector. The data and coefficient inputs must have the same data type.

数据类型：单身的|双倍的|INT8.|int16|int32|uint8.|uint16|UINT32|fi
Complex Number Support:是的

输出参数

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`y`— Filtered output
向量| matrix

Filtered output, returned as a vector or a matrix. The output has the same size and data type as the input.

数据类型：单身的|双倍的|INT8.|int16|int32|uint8.|uint16|UINT32|fi
Complex Number Support:是的

Object Functions

To use an object function, specify the System object as the first input argument. For example, to release system resources of a System object namedobj, use this syntax:

release(obj)

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Specific to`dsp.firfilter.`

`freqz`	Frequency response of discrete-time filter系统对象
`FVTool.`	Visualize frequency response of DSP filters
`轰炸`	Impulse response of discrete-time filter系统对象
`info`	Information about filter系统对象
`cos`	Returns the filter系统对象coicients in a structure
`cost`	Estimate cost of implementing filter系统对象
`grpdelay`	Group delay response of discrete-time filter系统对象
`generatehdl`	Generate HDL code for quantized DSP filter (requires过滤器设计HDL编码器)

Common to All System Objects

`步`	跑步系统对象algorithm
`release`	Release resources and allow changes to系统对象property values and input characteristics
`重置`	Reset internal states of系统对象

例子

collapse all

Lowpass Filter a Sinusoid Signal Using FIRFilter object

Open Script

Use an FIR filter to apply a low pass filter to a waveform with two sinusoidal components.

t =（0：1000）'/ 8e3;xin = sin（2 * pi * 0.3e3 * t）+ sin（2 * pi * 3e3 * t）;sr = dsp.signalsource;sr.signal = xin;inrint = dsp.signalsink;fir = dsp.firfilter（fir1（10,0.5））;sa = dsp.spectrumanalyzer（'采样率'，8e3，......'PlotAsTwoSidedSpectrum',false,......'OverlapPercent', 80,'PowerUnits','dbw',......'YLimits'，[-150 -10]）;while〜ISDONE（SR）输入= SR（）;filteredOutput = FIR（输入）;水槽（FilteredOutput）;SA（FilteredOutput）endfilteredResult = sink.Buffer; fvtool(fir,'FS',8000)

设计FIR滤波器作为系统对象。

n = 10;FC = 0.4;B = fir1(N,Fc); fir1 = dsp.FIRFilter(B); fvtool(fir1)

This can also be achieved by usingfdesign作为构造函数和设计到设计the filter.

n = 10;FC = 0.4;speclowpass = fdesign.lowpass（'n，fc'，n，fc）;FiR2 = Design（Speclowpass，'systemobject',true) fvtool(fir2);

fir2 = dsp.FIRFilter with properties: Structure: 'Direct form' NumeratorSource: 'Property' Numerator: [1x11 double] InitialConditions: 0 Use get to show all properties

Algorithms

这个对象实现该算法,输入,outputs described on theDiscrete FIR Filter(Simulink)block reference page. The object properties correspond to the block parameters.

扩展能力

C / C ++代码生成
Generate C and C++ code using MATLAB® Coder™.

使用说明和限制：

只有分子property is tunable for code generation.
SeeSystem Objects in MATLAB Code Generation（MATLAB编码器）。

Thedsp.firfilter.系统对象支持在这些条件下使用万博1manbetxIntel AVX2技术的SIMD代码生成：

Filter structure is set to'直接表格'要么'Direct form transposed'。
Input signal is real-valued with real filter coefficients.
Input signal is complex-valued with real or complex filter coefficients.
Input signal has a data type of单身的要么双倍的。

The SIMD technology significantly improves the performance of the generated code.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

DSP系统工具箱Documentation

万博1manbetx

尝试matlab，sim万博1manbetxulink等产品s manbetx 845

Get trial now

dsp.firfilter.

描述

创建

Syntax

描述

特性

Structure—Filter structureDirect form（默认）|Direct form symmetric|Direct form antisymmetric|Direct form transposed|Lattice MA

分子Source—滤波器系数的来源Property（默认）|输入端口

依赖性

RELLICTIONCOEFFICERSSOURCE.—滤波器系数的来源Property（默认）|输入端口

依赖性

分子—分子coicients[0.5 0.5]（默认）|row vector

依赖性

ReflectionCoefficients—晶格过滤器结构的反射系数[0.5 0.5]（默认）|row vector

依赖性

初始条件—FIR滤波器的初始条件0（默认）|标量|向量|matrix

Fixed-Point Properties

FullPrecisionOverride—全精确override for fixed-point arithmetictrue（默认）|false

圆形方法—定点操作的圆形方法Floor（默认）|天花板|Convergent|Nearest|圆形的|Simplest|零

依赖性

OverflowAction—Overflow action for fixed-point operationsWrap（默认）|饱和

依赖性

CoefficientsDataType—系数字和分数长度Same word length as input（默认）|Custom

依赖性

customcoefficientsdatatyp.—Custom coefficients word and fraction lengthsNumerictype（真实，16,15）（默认）|numerictype

依赖性

ReflectionCoefficientsDataType—反射系数词和分数长度Same word length as input（默认）|Custom

依赖性

CustomReflectionCoefficientsDataType—Custom reflection coefficients word and fraction lengthsNumerictype（真实，16,15）（默认）|numerictype

依赖性

ProductDataType—产品字和分数长度全精确（默认）|与输入相同|Custom

CustomProductDataType.—自定义产品单词和分数长度numerictype(true,32,30)（默认）|numerictype

依赖性

AccumulatorDataType—Accumulator word and fraction lengths全精确（默认）|与输入相同|Same as product|Custom

CustomAccumulatorDataType—Custom accumulator word and fraction lengthsnumerictype(true,32,30)（默认）|numerictype

依赖性

StateDataType—状态字和分数长度与累加器相同（默认）|与输入相同|Custom

依赖性

CustomStateDataType—Custom state word and fraction lengthsNumerictype（真实，16,15）（默认）|numerictype

依赖性

outputDatType.—输出字和分数长度与累加器相同（默认）|与输入相同|Custom

customoutputdatatype.—自定义输出字和分数长度Numerictype（真实，16,15）（默认）|numerictype

依赖性

Usage

Syntax

描述

Input Arguments

x—Data input向量|matrix

co—Filter coefficientsrow vector

输出参数

y— Filtered output向量| matrix

Object Functions

Specific todsp.firfilter.

Common to All System Objects

例子

Lowpass Filter a Sinusoid Signal Using FIRFilter object

Algorithms

扩展能力

C / C ++代码生成Generate C and C++ code using MATLAB® Coder™.

Fixed-Point ConversionDesign and simulate fixed-point systems using Fixed-Point Designer™.

See Also

Functions

Objects

Blocks

Topics

DSP系统工具箱Documentation

万博1manbetx

尝试matlab，sim万博1manbetxulink等产品s manbetx 845

`Structure`—Filter structure
`Direct form`（默认）|`Direct form symmetric`|`Direct form antisymmetric`|`Direct form transposed`|`Lattice MA`

`分子Source`—滤波器系数的来源
`Property`（默认）|`输入端口`

`RELLICTIONCOEFFICERSSOURCE.`—滤波器系数的来源
`Property`（默认）|`输入端口`

`分子`—分子coicients
`[0.5 0.5]`（默认）|row vector

`ReflectionCoefficients`—晶格过滤器结构的反射系数
`[0.5 0.5]`（默认）|row vector

`初始条件`—FIR滤波器的初始条件
`0`（默认）|标量|向量|matrix

`FullPrecisionOverride`—全精确override for fixed-point arithmetic
`true`（默认）|`false`

`圆形方法`—定点操作的圆形方法
`Floor`（默认）|`天花板`|`Convergent`|`Nearest`|`圆形的`|`Simplest`|`零`

`OverflowAction`—Overflow action for fixed-point operations
`Wrap`（默认）|`饱和`

`CoefficientsDataType`—系数字和分数长度
`Same word length as input`（默认）|`Custom`

`customcoefficientsdatatyp.`—Custom coefficients word and fraction lengths
`Numerictype（真实，16,15）`（默认）|numerictype

`ReflectionCoefficientsDataType`—反射系数词和分数长度
`Same word length as input`（默认）|`Custom`

`CustomReflectionCoefficientsDataType`—Custom reflection coefficients word and fraction lengths
`Numerictype（真实，16,15）`（默认）|numerictype

`ProductDataType`—产品字和分数长度
`全精确`（默认）|`与输入相同`|`Custom`

`CustomProductDataType.`—自定义产品单词和分数长度
`numerictype(true,32,30)`（默认）|numerictype

`AccumulatorDataType`—Accumulator word and fraction lengths
`全精确`（默认）|`与输入相同`|`Same as product`|`Custom`

`CustomAccumulatorDataType`—Custom accumulator word and fraction lengths
`numerictype(true,32,30)`（默认）|numerictype

`StateDataType`—状态字和分数长度
`与累加器相同`（默认）|`与输入相同`|`Custom`

`CustomStateDataType`—Custom state word and fraction lengths
`Numerictype（真实，16,15）`（默认）|numerictype

`outputDatType.`—输出字和分数长度
`与累加器相同`（默认）|`与输入相同`|`Custom`

`customoutputdatatype.`—自定义输出字和分数长度
Numerictype（真实，16,15）（默认）|numerictype

`x`—Data input
向量|matrix

`co`—Filter coefficients
row vector

`y`— Filtered output
向量| matrix

Specific to`dsp.firfilter.`

C / C ++代码生成
Generate C and C++ code using MATLAB® Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.