PWM on complex audio signals

[Happy Harry]

Unless I forget my tone controls... the
Baxandall control is used in a feedback loop,
where the "Fender" style passive tone controls
are just voltage dividers (cut only). So you
will have some different transient responses.

The "Fender" style controls can be overdriven
without trouble. The Baxandall should not be
overdriven....

H^) harry


>From: Don Tillman <don at till.com>
>To: cfmd at swipnet.se
>CC: DCMagnuson at aol.com, synth-diy at node12b53.a2000.nl
>Subject: Re: PWM on complex audio signals
>Date: Tue, 2 Jan 2001 22:01:24 -0800 (PST)
>
>    Date: Tue, 02 Jan 2001 22:20:39 +0100
>    From: Magnus Danielson <cfmd at swipnet.se>
>
>    There are many reasons not to like Baxendall's tone controls, but I
>    would please ask you to elaborate some on this topic. I'd also love to
>    hear some comments on what you would use instead and why.
>
>It's not so much Baxendall tone controls per se, it's hifi style tone
>controls in general.  Hifi style tone controls are designed for subtle
>adjustment of the balance of the highs and lows with respect to the
>mids with minimal interaction.  Which is what you want for hifi.
>
>But on a guitar, or any electronic musical instrument for that matter,
>you want to make dramatic changes to the response.  The tone controls
>on a guitar amp (Leo Fender's originals or any of the variations)
>throw radical hills and slopes into the response curve.
>
>Another issue is that a guitar has a limited frequency range; there
>are no subharmonics so there's nothing below 82 Hz (low E) and pickups
>don't put out anything over 4 to 6 kHz, depending on the pickup
>design.  With hifi tone controls on a guitar, when you turn up the
>bass or treble control the greatest amount of boost occurs at the
>extreme frequencies (below 82 Hz, above 6 kHz) where the instrument
>isn't putting out any signal.  So the treble control ends up operating
>as a hiss level control and the bass control ends up as a hum level
>control.  Not good.
>
>The right thing is a tone control that makes the greatest changes to
>the instruments' midband frequencies.
>
>(There's also the "existance proof"; it's hard to name a respected
>guitar amp with Baxendall tone controls.)
>
>(All my opinion, of course.)
>
>   -- Don
>
>--
>Don Tillman
>Palo Alto, California, USA
>don at till.com
>http://www.till.com
>

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