128 lines
2.8 KiB
Markdown
128 lines
2.8 KiB
Markdown
---
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title: MATLAB 函数 —— upsample（Signal Processing Toolbox）
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tags:
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- MATLAB
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- 翻译
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- 上采样
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categories:
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- [MATLAB, 函数用法]
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mathjax: true
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copyright: true
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comments: true
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abbrlink: 3a606c9c
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date: 2020-11-26 22:23:39
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---
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`upsample`：将采样率提高整数倍
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# 语法
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`y = upsample(x,n)`
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`y = upsample(x,n,phase)`
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<!-- more -->
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# 说明
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`y = upsample(x,n)` 通过在样本之间插入 `n - 1`个零来增加 `x` 的采样率。如果 `x` 是矩阵，则该函数将每一列视为单独的序列。[举例](#Examples-01)
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`y = upsample(x,n,phase)` 指定未采样序列所偏移的样本数。
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# 示例
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## 提高采样率<a name="Examples-01"></a>
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将序列的采样率提高 `3` 倍。
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``` matlab 输入
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x = [1 2 3 4];
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y = upsample(x,3)
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```
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``` plain 输出
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y = 1×12
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1 0 0 2 0 0 3 0 0 4 0 0
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```
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将序列的采样率增加 `3` 倍，并将相位偏移增加 `2`。
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``` matlab 输入
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x = [1 2 3 4];
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y = upsample(x,3,2)
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```
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``` plain 输出
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y = 1×12
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0 0 1 0 0 2 0 0 3 0 0 4 0
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```
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将矩阵的采样率提高3倍。
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``` matlab 输入
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x = [1 2;
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3 4;
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5 6];
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y = upsample(x,3)
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```
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``` plain 输出
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y = 9×2
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1 2
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0 0
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0 0
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3 4
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0 0
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0 0
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5 6
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0 0
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0 0
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```
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# 输入参数
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## `x` - 输入数组
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输入数组，指定为**向量**或**矩阵**。如果 `x` 是矩阵，该函数会将不同列向量视为独立的通道。
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**举例**：`cos(pi/4*(0:159)) + randn(1,160)` 指定加有高斯白噪声的正弦曲线。
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**举例**：`cos(pi./[4;2]*(0:159))' + randn(160,2)` 指定一个两通道的正弦波。
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## `n` - 上采样因子
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上采样因子，指定为**正整数**。
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**数据类型**：`single` | `double`
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## `phase` - 偏移量
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偏移量，指定为从 `0` 到 `n - 1` 的**正整数**。默认为 `0`。
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**数据类型**：`single` | `double`
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# 输出参数
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## `y` - 上采样数组
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上采样数组，以**向量**或**矩阵**的形式返回。`y` 有 `x × n` 个样本。
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# 扩展功能
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## C/C++ 代码生成
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> 使用 MATLAB® Coder™ 生成 C 代码和 C++ 代码。
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# 版本历史
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在 R2006a 之前推出
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# 另请参阅
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[`decimate`](https://ww2.mathworks.cn/help/signal/ref/decimate.html) | [`downsample`](https://ww2.mathworks.cn/help/signal/ref/downsample.html) | [`interp`](https://ww2.mathworks.cn/help/signal/ref/interp.html) | [`interp1`](https://ww2.mathworks.cn/help/matlab/ref/interp1.html) | [`resample`](https://ww2.mathworks.cn/help/signal/ref/resample.html) | [`spline`](https://ww2.mathworks.cn/help/matlab/ref/spline.html) | [`upfirdn`](https://ww2.mathworks.cn/help/signal/ref/upfirdn.html)
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> 原文参考：[https://ww2.mathworks.cn/help/signal/ref/upsample.html](https://ww2.mathworks.cn/help/signal/ref/upsample.html)
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