S'ware to FM arb waves

[Mark Waugh]

I am presently using CoolEdit to generate modulated audio tones for
test purposes. The only FM envelope that is possible to define is a
sine, square or triangle.

Is anyone aware of a software signal generating application (Windows
PC) that will allow me to FM a signal with a _complex_ or arbitrary
waveform? This also implies a graphical interface of some kind for
shaping the latter.

Both the carrier and modulating frequency should be created in
software, ie. not sampled.

I need something that will output via the soundcard as save as WAV or
MP3, not just a mathematical model.

Thank you,

Mark Waugh

 

[[email protected]]

I am presently using CoolEdit to generate modulated audio tones for
test purposes. The only FM envelope that is possible to define is a
sine, square or triangle.

Is anyone aware of a software signal generating application (Windows
PC) that will allow me to FM a signal with a _complex_ or arbitrary
waveform? This also implies a graphical interface of some kind for
shaping the latter.

Both the carrier and modulating frequency should be created in
software, ie. not sampled.

I need something that will output via the soundcard as save as WAV or
MP3, not just a mathematical model.

Thank you,

Mark Waugh

Matlab does it, get the Signal Processing and Communications package.

 

[joseph2k]

Matlab does it, get the Signal Processing and Communications package.

Bah. Any decent grade of SPICE can be trained to produce the most
incredibly complex waveforms. The data table output can be easily parsed
and translated into a .wav file. If you know much about programming, and
hopefully some electronics, you can generate more complex waveforms than
anyone thought of before. Think of differential AM and FM vibrato on an
already complex waveform. Then use that to FM and AM modulate a
subcarrier, add that to many other subcarriers. then do FM again. Take
some time it may. MathCad can partially automate such tricks easier than
SPICE. Still, you have to know your tools well to do these tricks.

 

[Robert]

Bah. Any decent grade of SPICE can be trained to produce the most
incredibly complex waveforms. The data table output can be easily parsed
and translated into a .wav file. If you know much about programming, and
hopefully some electronics, you can generate more complex waveforms than
anyone thought of before. Think of differential AM and FM vibrato on an
already complex waveform. Then use that to FM and AM modulate a
subcarrier, add that to many other subcarriers. then do FM again. Take
some time it may. MathCad can partially automate such tricks easier than
SPICE. Still, you have to know your tools well to do these tricks.

Or, IIRC, LTSpice has a direct WAV output for any combination of Generators
or Circuit processing you want to do. And it's free. Ask your question over
at the Yahoo Group

http://groups.yahoo.com/group/LTspice/

Helmut Sennewald drops by here from time to time and would certainly know
more about it.

Robert