Wir können es ja in die DIY-Pipe reinschieben. Wirklich aufwendig scheint die Geschichte ja nicht zu sein. Hat jemand nen Link parat zu einem Schaltplan?sonicwarrior schrieb:Also so richtig brauchen tue ich den Freq Shifter nicht wirklich,
aber es ist halt auch ein Modul, was nicht jeder hat.
tulle schrieb:Wir können es ja in die DIY-Pipe reinschieben. Wirklich aufwendig scheint die Geschichte ja nicht zu sein.
ACA schrieb:Wenn ich das Cwejman mit dem Modcan Demo vergleiche, dann fällt mir beim letzteren ein Delay/Reverb auf, was man aber beim Cwejman gar nicht hört.
Beim Demo von Modcan steht auch als Erklärung:
Pink noise swept by the FS. No reverb was added even
though it sounds like it.
Wieso den das? Könnte das die Feedback-Schaltung sein?
ACA schrieb:BBDs sind ja Delays, aber ein FS arbeitet soviel ich weiss nicht mit diesem Effekt.
Ilanode schrieb:Stark vereinfacht: Ein Freq. Shifter arbeitet wie ein Ring Modulator, bei dem das obere Seitenband (Freq up) und das untere (Freq down) isoliert abgegriffen werden.
sonicwarrior schrieb:Ilanode schrieb:Stark vereinfacht: Ein Freq. Shifter arbeitet wie ein Ring Modulator, bei dem das obere Seitenband (Freq up) und das untere (Freq down) isoliert abgegriffen werden.
Bei Ring Modularen gibt es ja keinen CV Eingang mit dem man die Frequenz der Ring-Modulation beeinflussen könnte.
To: analogue AT hyperreal PUNKT org,
From: Konkuro AT aol PUNKT com,
Subject: [AH] [REVIEW] Encore Frequency Shifter
Date: Thu, 4 Mar 2004 06:04:15 EST
Content-Type: text/plain; charset="US-ASCII"
Don't tell anybody, but my Synthesizers.com system actually has a "special
guest slot" for MOTM and Blacet modules, which use the same power supply as
dotcom and are deemed worthy of my beautiful Beast of Euless. The latest guest
(resident, actually) is the long, Long, LONG awaited Encore Frequency Shifter.
In this regard, the module shares more than just its format with MOTM (this
digression brought to you by Satan). Then again, some things are worth waiting
for and this module seems to have been one of them.
I've been waiting for this product to hit the market because it seems to be
the first design that isn't just a rehash of the famed Bode FS in one way or
the other. In a frequency shifter design, everything has to be perfectly
balanced or it all goes to hell, so it's no wonder that some designs have as many as
40 trim pots. That, of course, means 40 things that can go out of adjustment.
An important part of any frequency shifter design is the quadrature
oscillator, which generates two sine waves 90 degrees out of phase with each other. For
best results, this relationship must be kept constant. Encore ensures this by
using a RISC processor to generate two sine waves that are always perfectly
90 degrees apart and just the right amplitude (I'm not sure why it took
something as powerful as a RISC processor to do the job, but I'm not about to bitch
about something that works so well). These waves are multiplied with the input
signal to shift it up or down by the same number of Hertz. As a result, this
extremely clever design only seems to use fewer parts and generates spectra
that can only be described as pristine. This is welcome, because if things are
unbalanced you will get the carrier (quadrature oscillator) bleeding into the
output, which ruins the effect. To get around this, some of the better
frequency shifter designs employ a squelch circuit that hushes the output when there
is no input so that you won't detect the carrier frequency and your ear-brain
won't hear it in the output signal (think of how a ring modulator is *supposed*
to suppress the X and Y inputs, but few of them do a very good job of it).
With the Encore design, rabbit tricks like this aren't really necessary.
What does Frequency shifting sound like? It is akin to ring modulation,
except with more elegant and satisfying results. A frequency shifter transposes
the frequency components of a signal by the same number of Hertz, so the
harmonic relationships aren't preserved (unlike with pitch shifting). The result
is an enharmonic "clang tone" or bell-like sonority, in most cases. This can
either sound trashy or sophisticated, depending on how you use it.
So what are the features of this module? Jacks are audio input, CV in, Up
shift out and down shift out. As an added bonus, you also get access to the
quadrature oscillator, which offers sine out and cosine out (they both sound like a
sine, but are shifted 90 degrees out of phase). Controls include initial
shift (rough shift) fine shift, input gain, sine and cosine output attenuators,
up and downshift feedback controls, and a CV input attenuator. You can guess
what the attenuators do, so I'll skip those. What's interesting is that this is
a "through zero" design, meaning that you can apply the frequency shifting
effect down to subaudio. Why would you want to do this? Because at those
settings the output sounds much like a phasing effect. To make things more
interesting, you can apply the Up and Down feedback controls to get deep phasing
effects and other exotic sonorities. What, not enough? Take the Sine and Cosine
Outputs and use them to modulate separate filters. Now you are into Tomita
Territory, domo arigato! Other amazing effects are left as an exercize to the
Now for the interesting stuff:
THE BAD PART:
This design has ample space on the front panel for another jack and control,
so why Encore chose not to add a combined up/downshift output and mix control
like the Doepfer has, I don't know. It would have been easy to do and quite
It's great to have the sine and cosine waves available as a bonus feature and
they are quite useful. But because they are digitally derived, they have a
definite "stepped" quality at low frequencies, which can be annoying in some
situations. Slew limiters will fix this "problem" easily enough, but it's still
kind of annoying.
The very high impedance CV input doubtless provides important circuit
protection, but it makes the voltage control a bit fishy in some instances. For
example, you can sweep the shift frequency through its full range just by inserting
a patch cord and touching the tip of the opposite plug! The range is another
thing that is a tad disappointing. The control voltage is 0 to 5 volts.
Anything below or above that range has no effect. And a full five volts only causes
about a 500 Hz shift! That small range makes the input attenuator almost
superfluous. Indeed, the CV input should more accurately be called a "modulation
input." The doepfer FS offers a much wider and more useful range of sweep.
While I'm at it, a 1V/Oct CV in would have been really nice, as it would allow
you to play tuned noise, etc.
Apparently, any DC offset on the input will cause the carrier to decay after
input is removed rather than simply not sounding. This can be mildly annoying
if you are using the FS as the last stage in your audio chain. Otherwise you
could just gate the offending frequency out using an envelope follower and a
VCA to form a squelch circuit. An even easier solution would be to AC couple
the input using a capacitor (as found on the dotcom Connector Interface module).
Mind you, my description of this anomaly sounds worse than the actuality.
I could also swear that the Doepfer FS sounds a bit richer than this design.
Indeed, I remember synthesizing some very realistic gongs using the Doepfer,
which I've yet been able to do with this Encore--but give me time.
THE GOOD PART:
This module rocks!
Although the design will be a merry blue bitch to reformat for dotcom, MOTM
users will be delighted with the layout. It lacks the physical "heft" of MOTM
modules, but you are going to mount it, not fondle it, if you will pardon the
sexual allusion. The circuit quality is certainly worthy of MOTM and other
fine systems. It's QUIET. Best of all, it works wonderfully well. The thing I
didn't like about the Doepfer design was that it had quite a bit of carrier
bleedthrough which really detracts from the frequency shifting effect. This
design significantly suppresses that local oscillator tone, so you get an output
that is far more refined. Indeed, this design has a wonderful clarity of tone
to it that is really quite appealing.
The stellar specs of the Encore frequency shifter are enough to recommend it
(especially at $389!) but the quadrature outputs, feedback controls and
through-zero shifting are enough to make you want to offer your firstborn to it. Who
could blame Robert Rich for having a glorp orgy with his Encore demos? This
design invites--nay, DARES you to patch it in exotic ways for hours on end. If
this isn't one of the most versatile frequency shifters on the market, I'll
cluck like a chicken and eat Fruity Pebbles(TM).
Despite a few minor drawbacks, the Encore Frequency Shifter is a refreshingly
new design that harnesses a microprocessor to do away with legions of trim
pots and the problems thereto while offering superior stability, SNR and carrier
rejection. It's a very high quality design that I predict could eventually
outsell all others and was well worth the wait. You won't have to wait to get
it, though--Encore is extremely prompt with shipping and responsive to
inquires. Talk about a winning combo!
island schrieb:Yep, hab meine auch schon bezahlt Jetzt noch ein paar mal auf den Postboten warten und .....