MATLAB-产生扫频非余弦波吗? [英] MATLAB - produce a swept non-cosine wave?

问题描述

我正在尝试产生扫方波或三角波. chirp 函数产生扫余弦波；有没有办法用方波或锯齿波做到这一点?我现在的方法，至少对于像方波这样的方法，是

I am trying to produce a swept square or triangle wave. The chirp function produces a swept cosine wave; is there a way to do this with the square or sawtooth waves? My approach right now, at least for something like a square wave, is

V = A*chirp(t,f0,t1,f1, 'linear', -90); %#change the cosine wave to a sine wave
V(V<0) = -A;
V(V>0) = A; 

我可以用三角波来做相同类型的事情，但这有点烦人.

I can do the same type of thing with a triangle wave, but it's a little more annoying.

一般来说，还有更简单的方法吗?

Generally speaking, is there a more straightforward way?

推荐答案

扫描频率与评估函数相同

The swept-frequency is the same as evaluating a function

function(2 * pi * integral(f(t) dt))

其中f(t)(随时间变化的频率)与时间成线性关系.

where f(t), the time-varying frequency, is linear with time.

只需以两点形式编写一条直线的方程式:

Just write the equation for a line in two-points form:

f(t) = f0 + (t - t0) * (f1 - f0) / (t1 - t0)

并集成:

function(phase0 + 2*pi*f0*t + pi * (t - t0)**2 * (f1 - f0) / (t1 - t0))

最简单的形式是当t0 = f0 = phase0 = 0时，您将得到:

The simplest form of this is when t0 = f0 = phase0 = 0, then you get:

function(k * t**2)

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