Audio Programming and Serial Port programming advice needed.
Quote:
>We have a local radio station that wants their NetShow Encoder to
>Start and Stop based on a certain TONE that is fed through their
>audio-feed when something incoming is about to arrive. There are two
>ways I forsee this.
> (1) Have the audio-in go straight to the soundblaster, and have my VB
>5 program (that does OLE Automation to turn the encoder on/off)
>continously look at the audio-in for a certain tone/duration and then
>turn the encoder on. When the tone repeats itself turn the encoder
>off.
> (2) They have serial devices that they can connect to the audio source
>that is tone activated and have my VB Program continously look at one of
>the serial ports. When a certain signal comes from one of the serial
>com ports, my VB 5 program turns encoder on, when another signal comes
>in, turn encoder off.
> For option (1), anyone know anything about programming in VB 5 to look
>at the audio-in on a soundblaster?!?! Any pointers, directions?
> Or for option (2), anyone know about VB 5 programming to continously
>look at the serial port? Pointers directions?
> I'm assuming that this has been solved/done many times.. Since there
>are sooo many radio stations broadcasting over the net now.
> Any replies will be helpful!
> Rick...
Watching the serial port for an event will be easier than trying to
detect a tone on the SoundBlaster. The MSCOMM VBX/OCX control can be
used to monitor the state of a serial port, or it can be done with API
calls. Since the signal will probably be present for some know period
of time (1 sec, 10 sec, whatever), set a time to trigger the serial
port check event at half that time period - 500ms for a 1 second
signal.
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