Bode Barber Pole Phaser

[Donald Johnson]

At 08:46 AM 27/11/00 +0000, you wrote:
>There were a series of advertisments in Keyboard magazine back in the
>seventies which included a picture of what appeared to be a 19" rack. (Too
>small to make any detail out).
>
> >From memory, I think there were seperate adverts for frequency shifters and
>vocoders. Which might imply the unit is not a version of the Moog frequency
>shifter?

  I too have seen the advertisements. I enlarged a scan of the image
  and with details from the patent have been able to figure out most
  of the panel and circuit. There are a few controls I don't understand.
  The Bode's 'Barberpole Phaser' or infinite phaser uses a frequency
  shifter and a standard phaser in a feedback combination. The phaser
  frequency nulls are shifted up and down through the frequency shifter.
  So, its method is different from a collection of phasers and VCAs
  as John Simonton described in the Polyphony 'Shepard tone' article.
  If _you_ know any more, let's hear.

>Consequently, I am puzzled about the functionality of the barber pole
>phaser. By name a 'shepard tone' equivalent of phasing might be expected.
>However, there are stories of frequency shifting too.
>
>Can anyone resolve this?
>
>-----Original Message-----
>From: Donald Johnson [mailto:donaldj at infomatch.com]
>Sent: Monday, November 27, 2000 1:16 AM
>To: Turner Wallace
>Subject: Re: Bode Barber Pole Phaser
>
>
>At 10:26 AM 24/11/00 +0000, you wrote:
> >Are there any schematics for the Bode barber pole phaser available?
>
>   How did you hear about this effect? Have _you_ seen or heard one?
>   I've been trying to find information on it, so anything you know
>   would be appreciated.
>   thanks,
>   don.

  don.

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