Visual C++ AM/FM generation using NI-6062E & DAQmx C functions

hi all,
I am trying to write my own code in VC++ .Net(MFC) for FM/AM generation using DAQmx C functions, but it was more demanding than on the LabView platform. I can build the framework for all parameters (ie. Carrier Freq, Modulation Freq, Modulation Index, Amplitude) but as I came to the the array size, sampling rate, buffer size, I don't know what to do??
Can anyone please have a look?
Thank you very much!
Attachments:
NI_AM_FM.zip ‏60 KB

Hello Sean,
The following code is where I think most important to my task of AM/FM generation:
(Ln147 to Ln162 in FunctionGenerator.cpp)
void CFunctionGenerator::GenerateSineWave(
CNiReal64Vector& waveform,
double frequency,
double amplitude,
double sampleClockRate, // samples/sec.
double samplesPerBuffer)
double deltaT = 1/sampleClockRate; // sec./samp
int intSamplesPerBuffer = static_cast(samplesPerBuffer);
waveform.SetSize(intSamplesPerBuffer,CNiVector::NiVectorDoNotInit);
for(int i=0;i waveform[i] = amplitude * ::sin( (2.0 * M_PI) * frequency * (i*deltaT) );
I want to change the waveform 1D array to something like this for FM:
waveform[i] = amplitude * ::cos(((2.0 * M_PI)*carrier_frequency*(i*deltaT)) + modulation_index*sin((2.0 * M_PI) * modulator_frequency * (i*deltaT)));
for AM:
waveform[i] = amplitude * (1 + modulation_index * cos (( 2.0 * M_PI) * modulator_frequency *(i*deltaT))*cos((2.0 * M_PI)* carrier_frequency *(i*deltaT)));
It seems I need to add two more parameters "double frequency_modulator, double modulation_index," to the GenerateSineWave function,
but it also looks like I need to adjust the "for(int i=0; i < intSamplesPerBuffer; i++)" because from my LabView Block Diagram iteration of "i" also depends on the two frequency parameters?
Do I also need to adjust deltaT? or the sampleClockRate is not fixed in FM/AM cases?
How can I do the above?
Thank you for your patient.
Regards,
RollyMessage Edited by Rolly on 04-06-2005 02:35 PM
Message Edited by Rolly on 04-06-2005 02:38 PM

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I think what I'm really looking for is a console command I can feed into the Terminal which toggles the keys. It seems to be that this HAS to be an option, even if it is more than one line of commands. I believe if I can feed this process into Automator, it would work.
Any ideas?
Thanks in advance, Mac Geniuses!

iKey lets you define function keys per application. You seem to want to turn on & off the defined apple keys. Not sure if these keyboard re-mappers will do the trick.
Here is my other most favored application. Of course, I haven't checked these out in newer OS's. I'm a Tiger man myself.
iKey is a front end program that simulates typing and mouse movements. I use iKey to remap the Function keys.
"iKey is an automation utility, a program that creates shortcuts to accomplish repetitive tasks. In essence, an iKey shortcut is a little program in its own right, but you don't need to know the first thing about programming to create an iKey shortcut. All you have to do is put together three necessary parts of a shortcut: One or more commands that give the shortcut its functionality, a context in which it runs, and a launcher that defines how the shortcut is activated."
http://www.scriptsoftware.com/ikey/
iKey has a little more function then the previous free version called youpi key. For many years, I used youpi key before switching to iKey. It works fairly well for me in MAC OS 10.4 although not officially supported. The youpi key download is hard to find & no longer here.
http://www.versiontracker.com/dyn/moreinfo/macosx/11485&vid=75326
( Send me a message for a copy of youpi key. )
*Examples:*
I have the common programs that I use assigned to function keys. I have F4 assigned to Firefox. When I want to start FireFox, I press F4. When I want to switch to firefox, I press F4! Starting & switching to an application in Mac OS are the same thing in Mac OS.
Here is an example of to assign volumn control to a function key.
http://discussions.apple.com/message.jspa?messageID=10361085#10361085
Here is my script for listing my application folder. I have it assigned to function-key 6.
tell application "Finder"
   open folder "Applications" of startup disk
   select Finder window 1
   set bounds of Finder window 1 to {-3, 44, 691, 545}
   --set position of Finder window 1 to {33, 44}
   set position of Finder window 1 to {60, 45}
   activate
end tell
The second portion of this script was generated in the script editor record mode. After I recorded the script and did some editing, I copy the script to ikey/youpi key.
Full Key Codes
http://download.cnet.com/Full-Key-Codes/3000-2094_4-44175.html
Spark
"Spark is a powerful, and easy Shortcuts manager. With Spark you can create Hot Keys to launch applications and documents, execute AppleScript, command iTunes, and more... You can also export and import your Hot Keys library, or save it in HTML format to print it. Spark is free, so use it without moderation!"
http://www.versiontracker.com/dyn/moreinfo/macosx/22675
Mac OS X remap or rename keyboard keys
by vivek
So how do you remap or rename keyboard keys under Mac OS X?
Simply use DoubleCommand software. It is a free program
http://theos.in/apple/download-doublecommand-to-remap-keyboard-keys/
Keyboard Maestro is a powerful macro program for Mac OS X (including Tiger and Leopard) which has received glowing reviews. Keyboard Maestro will take your Macintosh experience to a new level in “Ease of Use”. With Keyboard Maestro you can design a custom action sequence with your own shortcuts and use them at any time, you can navigate through running applications and open windows with Program Switcher, and you can work with an unlimited number of clipboards - all by pressing simple keystrokes.
http://www.keyboardmaestro.com/main/
"Spark is a powerful, and easy Shortcuts manager. With Spark you can create Hot Keys to launch applications and documents, execute AppleScript, command iTunes, and more... You can also export and import your Hot Keys library, or save it in HTML format to print it. Spark is free, so use it without moderation"
http://www.versiontracker.com/dyn/moreinfo/macosx/22675

How to use a mysql built-in function with dataprovider

hi.
I want to use a mysql built-in function, for example, MD5() on a column when updating a table with dataprovider.
Something like this doesn't work:
MyDataProviderOne.setValue("tablename.field_name", "MD5('some text')");
How should it be done?
thanks.
Mike.

hi.
thanks. this helped, but I'd like to use also different functions, that's why, I'd rather do it by MySQL built-in functions with dataprovider... Is there any way to do that?
best regards.
Mike.

Visual C++ AM/FM generation using NI-6062E & DAQmx C functions

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