Hi Darwin-
The thing is that D(n) is continuous-valued. So a delay line using an
integer number of samples (like x[n+D]) is problematic to get a good
flanger effect.
One option is to upsample the signal x[n] by a large factor for flanger
processing. Then you can use a simple integer delay line to
Hey David.
Thank you for your response., i appreciate it. i have tried your code,. but
i does not work..:(
what can you say about this flanger formula?
*y(n)=x(n)+ax(n-D(n))* where a is ax array? y is output and x is input? and
D is the delay. i think the D is the Delay which implemented by LFO.
On 6/26/14 4:14 PM, Bogac Topaktas wrote:
In guitar amps grid currents are mostly
important while simulating power stages.
In modern high-gain amps like Soldano SLO, the distortion
is generated in preamp stages and there are large grid
resistors in all 12AX7 stages to eliminate grid currents,
In guitar amps grid currents are mostly
important while simulating power stages.
In modern high-gain amps like Soldano SLO, the distortion
is generated in preamp stages and there are large grid
resistors in all 12AX7 stages to eliminate grid currents,
as they would ruin the "juicyness" by causing
Hi Darwin,
The LFO looks to be not implemented properly... appears like you are trying
to make a lookup-table, which would be an array of values. But you will still
need to interpolate between integer indexes in order to match up with your
float phasor value. Check out this article to see ho
About bias shifts: actually grid bias shifts tend to make the sound fuzzier
more than compressed, especially when the the decoupling cap is connected to
a sinky spongy grid (like the 6L6), roughly changing with the "envelope" of
the input signal. In the push pull you wont notice that (because effec
Hi Steffan,
>
> A model is as good as you understand your subject.
>
> The problem with the tube equations from Norman Koren is, that they don't
> account for grid current. Having done some live investigation in tube
amps,
> my conclusion is, that grid currents contribute largely to the operation
[Apologies for crossposting]
A reminder that the third annual SoundSoftware Workshop, a full day of
presentation sessions about all aspects of software in audio and music
research with a sociable and friendly atmosphere, takes place on Tuesday
8th July in London.
The speaking programme is now co
This whole tube sim thing is not about frequency response issues. What matters
most, is to understand and model the dynamic behaviour of the tube circuit:
bias point variation, grid current effects, complex loads, ….
Steffan
On 26 Jun 2014, at 14:46, Theo Verelst wrote:
> On a practical le
On a practical level, suppose somehow you've modeled the tube distortion
as a zero delay computation (in however good or bad way), and you want
to limit the frequency range of your your input signal to the "tube
effect" with say a 2-delay properly adjusted digital filter (maybe
cutting DC like
On 26 Jun 2014, at 14:13, robert bristow-johnson
wrote:
> grid current is zero only if V_gc < 0, which is normally how it's biased, but
> large signal swings can change that. when V_gc > 0, the grid is like a
> miniature plate, it will draw some electrons off.
>
> looks a little like a diod
On 6/26/14 8:01 AM, STEFFAN DIEDRICHSEN wrote:
Having done some live investigation in tube amps, my conclusion is, that grid
currents contribute largely to the operation of a tube amp, if you drive them
into distortion.
grid current is zero only if V_gc < 0, which is normally how it's
bias
On 25 Jun 2014, at 22:46, Marco Lo Monaco wrote:
> if something doesn't match you can really do anything on the
> model itself once you are sure that everything has been
> done/implemented/analyzed properly.
A model is as good as you understand your subject.
The problem with the tube equation
Hi Guys i am trying to convert this one into a c++ code.
The flanger is a kind of comb filter which delay *D* is not constant, but
changes periodically.
[image: flanger-schem]
Pic.8. The scheme of FIR flanger
The difference equation is *y(n)=x(n)+ax(n-D(n))*, where, for example
*D(n)=d/2(1-cos(2p
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