函数回调（'StopFcn'，'TimerFcn'）对于MATLAB中的audiorecorder对象？

问题描述

所以我试试这个代码。

% assume fs,winsize,winshift is given.

T = 0.1; % in seconds
samples = cell{100,1};
r = audiorecorder(fs,16,1);
k=1;
r.TimerPeriod = 0.1;
r.StopFcn = 'samples{k} = getaudiodata(r);';
r.TimerFcn = {@get_pitch,samples{k},winsize,winshift};

while 1
     record(r,T);
     k=k+1;
end      

我想执行函数'get_pitch（samples，fs，winsize，winshift ）'，而在录制期间通过audiorecorder对象。

I want to execute the function 'get_pitch(samples,fs,winsize,winshift)' while during recording through audiorecorder object.

但是在执行期间发生下列异常。

But following exception occurs during execution.

1）执行记录（r，T）后。 （StopFcn现在调用）？在调用StopFcn（现在调用TimerFcn）之后，错误使用==> eval未定义的函数或变量'r'。

1) after record(r,T) is executed. (StopFcn is now called) ??? Error using ==> eval Undefined function or variable 'r'.

在这个阶段，get_pitch函数完全错误参数。例如，位置样本{k}中的参数更改为audiorecorder object。

2) after StopFcn is called (TimerFcn is now called) In this phase, get_pitch function have totally wrong parameters. For example, parameter in the position samples{k} change to 'audiorecorder object'.

似乎我不知道'StopFcn' 'TimerFcn'。

It seems that I do not know exact use of 'StopFcn' & 'TimerFcn'.

有没有人能给我一些建议？非常感谢您的所有意见。

Is there anyone who can give me some advice? I really appreciate all of your comments.

推荐答案

查看我建议尝试在您的循环中调用getaudiodata（r），而不是使用CallBack。这样的东西：

Looking at the example in the documentation I would recommend trying to call getaudiodata(r) in your loop rather than with the CallBack. So something like this:

% assume fs,winsize,winshift is given.

T = 0.1; % in seconds
samples = cell{100,1};
r = audiorecorder(fs,16,1);
k=1;
r.TimerPeriod = 0.1;
r.StopFcn = 'disp(''Completed sample '', k)';
r.TimerFcn = {@get_pitch,samples{k - 1},winsize,winshift};

while 1
     record(r,T);
     samples{k} =  getaudiodata(r);
     k=k+1;
end   

注意我改变了 r.TimerFcn 使用 samples {k - 1} 而不是 k ，因为k会在timerfcn被调用之前递增。所以这可能给你的第一个样本的问题，你将不得不调整一点。这也是一个无限循环，我相信你会想解决。

Note I changed the r.TimerFcn to use samples{k - 1} instead of k because k will increment before the timerfcn gets called. So this might give you issues with your first sample, you'll have to tweak it a little. Also this is an infinite loop, which I'm sure you'll want to address.

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