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'[PIC] ISD chiprecorder was Problem With MAX232'
> looks like they need to do the programming of the message
Carl, not at all (if I'm understanding what you want). ISD chips
have both a microphone - generally a cheap insert type - input
and analogue input to record sound directly. A micro or logic
selects the appropriate phrase or part-message to play. For
example the ISD1416 has 160 addressable segments, down to
a resolution of 100ms. Have a look at the "Typical Application
Circuit" in a datasheet. I use ISD now and then and it's dead
As I, at this early stage picture the setup: The PLC would send a data
which would be the WINBOND message start address out the RS-485 to a PIC
controlling the Winbond unit. The PIC would then send out the output
ports the address of the start of the message wanted to vocalize, and
start the WINBOND unit. Since the messages would be short in length,
there could be many stored. On the PIC/WINBOND board there would be a
pushbotton and microphone to record a message. Haven;t got to the point
of what that address would be, probably all messages would be kind of
similar length and take the longest and use that increment for all
addresses. If I went and added a message to the WINBOND, all I would
have to do was reprogram the PLC which would have to be done to handle
the new alert. Does this sound about right at this early stage?
> Does this sound about right at this early stage?
Pretty much. To edit and sweeten the sound, use a PC recorder
like Goldwave http://www.goldwave.com which, although slightly
crippled, is essentially free for what you need. ie record clips
with a better microphone, enhance the messages' tone to best
suit the ISD bandwidth (eg bandpass or EQ) and edit clips for
length, remove unwanted noise, etc. Then program the clips via
Line Out into ANA IN. Clip start addresses then go into a PIC
table for look-up
The above would be fairly easy for a one-off. Otherwise Harold's
Quadravox for a more production-line approach
Sounds like a lot of work, when trying to KISS, would prefer like my
telephone answering machine, push the button, talk, push button to
accept message. :) And this would be a one off.
> Sounds like a lot of work, when trying to KISS, would prefer
> like my telephone answering machine, push the button, talk,
> push button to accept message. :) And this would be a one off.
Of course, no reason why you can't use just the basic set-up, and
you probably will get reasonable results. That does depend on your
voice quality to start with (I'm assuming you don't sound too much
like Gilbert Gottfried) and the playback medium. I'm just saying that
for a little extra time you could have a better sound if you wanted.
Not that ISDs are going to win any awards whatever you do, the
bandwidth is speech and lo-fi music
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