How to create a audio pulse wave ?

[zenit52]

Hi to all,

i am new in this forum and want to create a audio pulse wave with desire
Pulse-width and frequency,
for example i want create a audio pulse wave with 200 microsecond Pulse-width and 100 Hz frequency...

please help me about this...
Thanks...

 

[Erel]

You can use the Beeper object. However it is not available in the trial version.

 

[zenit52]

You can use the Beeper object. However it is not available in the trial version.

Thanks dear,

by [Beeper] can i produce exactly 200 microseconds pulse wave?

 

[klaus]

Look here Beeper.

Best regards.

 

[zenit52]

Thanks,
with [Beeper] we can produce a exact beep in 100 microsecond width ?

 

[klaus]

Yes,
The help for Beeper says:
Plays a "beep" sound with the given duration and frequency.

Best regards.

 

[agraham]

If I understand correctly I don't think Beeper will do what you want. Beeper will produce a sine wave of the requested duration and frequency. It sounds like you want a square pulse of a certain width and repetition frequency. If so the nearest you would get is by making and playing a wav file,
http://www.b4x.com/forum/basic4android-updates-questions/11271-create-write-wave-file.html#post63090, though if the output from the device is capacitively coupled, as it probably is, some DC restoration on the resulting waveform might be needed depending upon the characteristics of your load.

 

[Beja]

Thanks zenit52 and your guests,
It is a good idea and I will try to use the beep for communication, you may need to remove the DC current and noise.. sine-wave can be Schmitt triggered, so it is not a big deal.
On the other hand, is there a DTMF object? if exists then it will be perfect to use for communication.