MATLAB: Parallel Computing

data acquisationsignal processing

Hi, i need to record the speech signal and in parallel to that i have to use the pre-recorded interval for further processing(i.e recognition of the digit) but still the recording has to go on in the background.. So can anyone please help me out in this…

Best Answer

Hello.

I would suggest doing the recording in the background using a single MATLAB worker with a single task. You can set up a timer within that task if you want to do this recording at a consistant interval (i.e. record and save every 30 seconds). This way you can use the client MATLAB to do your interactive data processing.

At some point you need to end your task, you can set a total time at which you want the task to stop using something like a while statement.

These documentation links may be able to help you:

Using Timers

Using Jobs and Tasks

Hope this helps.

Cheers,

Sarah

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MATLAB: Previewing pre recorded video

Hi Koohyar,

I understand that you want to preview pre-recorded video and not a live one. The preview function requires a video input object which is not possible to create using pre-recorded video file.

VideoReader is used for reading and previewing a pre-recorded mp4 file. I am attaching a snippet from the documentation that does the same.

v = VideoReader('xylophone.mp4');
currAxes = axes;
while hasFrame(v)
    vidFrame = readFrame(v);
    image(vidFrame, 'Parent', currAxes);
    currAxes.Visible = 'off';
    pause(1/v.FrameRate);
end

Hope this helps.

MATLAB: I have a script that I run via a timer every 30 minutes — how to run this in background

Robert - try creating a function that you can call from the command line. It will instantiate a timer and then periodically (whenever the timer callback fires) will do some work. For example, in a file named timerInBackground.m you could have

function [myTimer] = timerInBackground
myTimer = timer('Name','MyTimer',               ...
                'Period',30*60,                 ... 
                'StartDelay',0,                 ... 
                'TasksToExecute',inf,           ... 
                'ExecutionMode','fixedSpacing', ...
                'TimerFcn',@myTimerCallback); 
start(myTimer);
function myTimerCallback(hObject, eventdata)    
fprintf('hello!\n');

Then call this function from your command window as

 myTimer = timerInBackground;

Then every 30 minutes (30*60 seconds) the timer callback will fire and (in this case) print a hello! message to the console window. In the meantime, you can continue with other MATLAB tasks.

Best Answer

Related Solutions

MATLAB: Previewing pre recorded video

MATLAB: I have a script that I run via a timer every 30 minutes — how to run this in background

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