How to create a audio pulse wave ?

Erel

B4X founder

Staff member

Licensed User

Longtime User

• Nov 11, 2012

• #2

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

 

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Z

zenit52

New Member

• Nov 11, 2012

• #3

Erel said:

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

Click to expand...

Thanks dear,

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

 

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klaus

Expert

Licensed User

Longtime User

• Nov 11, 2012

• #4

Look here Beeper.

Best regards.

 

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Z

zenit52

New Member

• Nov 14, 2012

• #5

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

 

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klaus

Expert

Licensed User

Longtime User

• Nov 14, 2012

• #6

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

Best regards.

 

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agraham

Expert

Licensed User

Longtime User

• Nov 14, 2012

• #7

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.

 

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Beja

Expert

Licensed User

Longtime User

• Nov 15, 2012

• #8

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.

 

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