rfg@hound.UUCP (R.GRANTGES) (11/27/84)
[.] If you can lock the oscillator to around 2hz, you will have reinvented a feedback preventer for public address systems and your local whatever will love you. With your device in the circuit, the amplified version of your voice will still sound pretty much like you normally would, but any feedback from speakers to mike will be frequency shifted so the system cannot sing. You can then add more gain so speakers are louder and audience can hear more easily. I believem that you can't use a whole lot more gain because then the recirculated version(s) of speech become audible as a very peculiar sound. This is much less of a good idea on music than voice, I understand. As should be obvious by now, I am not aware of ever having heard one of these and the fact that they have not taken over the world indicates there is something wrong with the idea. However, I do know these have been built and used fairly extensively.
wookie@alice.UUCP (12/07/84)
I used to work for Gray Sound and Communications Systems in Pittsburgh back in the early seventies where we used a frequency shifter for radio station KDKA. Each Christmas they ran a drive for Children's Hospital which involved the radio programming coming from the front window of one of the large department stores. The public was activly involved inthe programming and so had to be able to hear and talk with the djs. The frequency shifter was the only practical way to stop the feedback problem with the man on the street. Keith Bauer White Tiger Racing