[sdiy] Phasing circuit

[Czech Martin]

I think all the basic work on phasing SSB methods
originates from Weaver, this guy is also mentioned as
source in EN (from my head).

m.c.

-----Original Message-----
From: Magnus Danielson [mailto:cfmd at swipnet.se]
Sent: Freitag, 25. April 2003 05:09
To: patchell at silcom.com
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Phasing circuit


From: patchell <patchell at silcom.com>
Subject: Re: [sdiy] Phasing circuit
Date: Thu, 24 Apr 2003 19:01:38 -0700

> > Does it explain in any way how those numbers where calculated or generated?
> > Is there any references to other articles?
> >
> > (actually, when I asked about references I really meant, what does that EN
> > reference, but I agree knowing which EN is also good)
> 
> References:
> 
> [1] Harald Bode, "Solid State Frequency Spectrum Shifter", AES Preprint 395, Oct
> 1965
> [2] Harald Bode and Robert Moog, "A High Accuracy Frequency Sifter for
> Professional Audio applications", J. Aud. Eng. Soc., Vol 20, No. 6, July/Aug 1972,
> pp 453-458
> 
> [3] haral Bode, "Apparatus for producing Special Audio Effects Utilizing Phase
> Shift Techniques", US Patent 3800088 , March 26, 1974 (filed Aug 28, 1972)
> 
> [4] B. Hutchins, Musical Engineers Handbook, (1975) Chapter 6a
> [5] B Hutchins, "Phase Shift Networks and Applications", EN#59 (2) Nov. 1975
> [6] reference [2] page 455
> [7] Data and Applictions Literature on AD533 multipliers and related products.
> Analog Devices.
> [8] Norlin Music (Moog); Bode Sound Company, N Tonawanda, NY 14120; 360 Systems
> Los Angeles

Great! Thanks!

The patent US3800088 is available from Espacenet and is 8 pages long. Due to
some "#%"#¤%¤# bug I seem unable to view and download it, but it should be
there for others to view.

>     I could not find any information in the article about how they came up
> with those numbers (however, I could have missed something).

OK. For me there is a grey spot in the theory field right there. How the hell
did people come up with those numbers? I just want to know and be directed to
the papers detailing it.

>     There was an article in either EDN or Electronic Design (I am not sure which
> one), that had a BASIC program for calculating out the pole locations for a 90
> degree phase network to any desired accuracy, I think...it would have been over 20
> years ago...found it..."90-degree phase-difference networks are simply designed
> with a program in BASIC.", Electronic Design, September 13, 1976...gee, nearly 30
> years ago, my how time flies...but here is the part that sucks...I don't seem to
> have the page that has the basic listing on it.  Does Electronic design have an
> online archive?

I have actually received scans of such an article, probably exactly the one you
are refering to, complete with the BASIC code (altought hard to read as I
recall it). I've found part of the BASIC code as I have cleaned it up, but I
need to dig some more to find the actual article. Glorypoles or something.

Cheers,
Magnus