Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!pmafire!tuv
From: tuv@pmafire.UUCP (Mark Tovey)
Newsgroups: sci.electronics
Subject: Re: Need  circuit to drop music an octave
Message-ID: <1990Aug06.150222.23167@pmafire.UUCP>
Date: 6 Aug 90 15:02:22 GMT
References: <1990Jul20.223615.4305@portia.Stanford.EDU> <1332@fs1.ee.ubc.ca> <58975@lanl.gov> <32424@cup.portal.com>
Reply-To: tuv@pmafire.UUCP (Mark Tovey)
Organization: WINCO Computer Engineering, INEL, Idaho
Lines: 22


 In article <1990Jul20.223615.4305@portia.Stanford.EDU> ceg@nova.stanford.edu 
(Chris Gronbeck) writes:
>
>I'm looking for suggestions as to the best way to design a circuit to
>drop music
>one or more octaves.  A typlical application being making an electric guitar
>perform like a bass.  Any hints would be useful.  Thanks.
>
> 
   My memory is very dim at this point but I recall reading years ago in
something like Popular Electronis or something like that about plans for 
an ultrasonic sniffer. This device utilized the receiver transducer for 
the old style television remote control units to pickup ultrasonic sounds.  
This is where my memory gets real hazy. If I remember correctly, the signal
was passed to a circuit that resembled the front end of a radio receiver and
reduced the signal down to some intermediate bandwidth. From here it was 
converted to normal audio and passed into an audio amplifier.

   I have no idea how well it worked or how to go about building one, but
it seems to me that the two problems are similar: shifting a signal down
a known amount in the spectrum. Any ideas or thoughts?