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slide projector controlled by pc

G

Gert Everaert

Jan 1, 1970
0
Hi group,

I would like to control my slide projector with my pc. Unfortunately, the
projector has no serial interface, only a connector for an AV recorder
(which uses an extra track for 1000 Hz sync pulses). Can I use a soundcard
to do this ? I want to switch to the next slide by some PC-command
Thanks,

Gert
 
T

the Wiz

Jan 1, 1970
0
Gert Everaert said:
Hi group,

I would like to control my slide projector with my pc. Unfortunately, the
projector has no serial interface, only a connector for an AV recorder
(which uses an extra track for 1000 Hz sync pulses). Can I use a soundcard
to do this ? I want to switch to the next slide by some PC-command
Thanks,

Gert

If the PC is running DOS, the SOUND statement in QBASIC or GWBASIC could be used
to generate the tone.

If the PC is running Windows, it's somewhat more complex ;-)

The soundcard would also have to deliver sufficient signal to drive the tone
detector circuit in the slide projector - the audible "beep" is often at the
peak level of the narration.

More about me: http://www.jecarter.com/
VB3/VB6/C/PowerBasic source code: http://www.jecarter.com/programs.html
Freeware for the Palm with NS Basic source code: http://nsb.jecarter.com
Drivers for Pablo graphics tablet and JamCam cameras: http://home.earthlink.net/~mwbt/
johnecarter at@at mindspring dot.dot com. Fix the obvious to reply by email.
 
S

scada

Jan 1, 1970
0
Gert Everaert said:
Hi group,

I would like to control my slide projector with my pc. Unfortunately, the
projector has no serial interface, only a connector for an AV recorder
(which uses an extra track for 1000 Hz sync pulses). Can I use a soundcard
to do this ? I want to switch to the next slide by some PC-command
Thanks,

Gert

You can download a number of free Virtual Signal Generators that will run in
the Windows environment. Try outputting the 1000 HZ tone, with the Audio
output card connected to the AV recorder input. You may need to run that
signal through some amplification to get it to the proper level, or the
windows program level control may be enough. If that works, writing a small
program in your favorite language should be easy. For instance, in VB it
would only require a few lines of code to have a button output the required
tone.
 
G

Gordon Youd

Jan 1, 1970
0
Back in the "good old days" we used to use a tape recorder.

Track one recorded the music/speech, the other track recorded the 1000Hz at
the right point for slide change.

Great stuff!.

Regards, Gordon.
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