yes, this is quite similar to the clicks i've got ;)
I said 2-3 times per second, not every 2-3 secons.
julian
Am 10.04.2012 19:06, schrieb Olli Niemitalo:
On Tue, Apr 10, 2012 at 6:54 PM, Nigel Redmon wrote:
"Clicks", especially 2-3 seconds apart doesn't describe aliasing
Here are clicks cr
It is, in fact, an aliasing problem.
I changed the code to use a sine table wich works fine.
Then I implemented a phase distortion saw oscillator similar to the
casio CZ series.
when i increase the harmonic content (morph more and more to saw) I get
the clicks again.
But this is a special cas
here is the eclipse tutorial i used to get the free toolchain with GDB
support working under windows
http://shareee.netne.net/wordpress/?p=5
there you will also find a simple LED blink example project.
afaik CodeSourcery lite and Yagarto don't support the hardware FPU at
the moment. They only
the signal at 1kHz and its harmonics is digital noise coming from the
USB power supply.
it is gone if i connect headphones or my Oscilloscope instead of my pc
soundcard.
julian
Am 10.04.2012 12:02, schrieb Tim Goetze:
[Julian Schmidt]
here are some screenshots...
the beating bell shape on
So far I havn't inspected static waveforms with an fft so closely. I'm
still waiting for my ordered midi uart parts for the board, so i don't
have anymated waveforms for now ;)
julian
Am 10.04.2012 00:00, schrieb Olli Niemitalo:
On Tue, Apr 10, 2012 at 12:25 AM, Julian Schmid
Am 09.04.2012 23:22, schrieb Olli Niemitalo:
On Mon, Apr 9, 2012 at 11:32 PM, Julian Schmidt
wrote:
I really think it is an aliasing problem.
but not due to the wrong wavetable content, but due to a cheap audio codec
with poor filters.
[...]
even when i output a single 440hz sine i get
here are some screenshots...
the beating bell shape on 440Hz sinus with 84 harmonics
http://i.imgur.com/B4s0M.png
a simple sine table 220Hz
http://i.imgur.com/hPKj1.png
julian
Am 09.04.2012 22:32, schrieb Julian Schmidt:
I think you win! ;)
first i tried switching to integer phase
.
julian
Am 09.04.2012 20:28, schrieb Olli Niemitalo:
On Mon, Apr 9, 2012 at 7:17 PM, Julian Schmidt
wrote:
setting the phase increment to an integer value solves the problem.
[...]
adding linear or cubic interpolation makes it a little better, but the
pulsing is still very audible.
[...]
The
yes. that was the first place i looked, the codec datasheet. ;)
limiter, de-emphasis, tone control are all turned off
gain is about 50% of the possible amplitude.
julian
Am 09.04.2012 19:38, schrieb Gwenhwyfaer:
On 09/04/2012, Julian Schmidt wrote:
yes exactly. it's cheaper than buyin
Am 09.04.2012 19:16, schrieb robert bristow-johnson:
i hadn't heard of this dev board before. at
http://www.st.com/internet/evalboard/product/252419.jsp it says that
the single unit prices is US$14.9 . is that right? that's nearly free.
yes exactly. it's cheaper than buying the cortex m4
if so, what size?
On Apr 9, 2012, at 6:28 AM, Julian Schmidt wrote:
Hello all,
I'm trying to get an oscillator running on the STM32F4 discovery board.
I'm sending my audio with 44100Hz via I2S to the onboard codec.
However I'm experiencing strange problems.
my code ist qu
your wavetable
oscillator at full-scale amplitude. Try reducing the wavetable
amplitude.
-olli
On Mon, Apr 9, 2012 at 4:28 PM, Julian Schmidt
wrote:
phase += phaseInc(440); // calculate the phase increment for 440 hz and add
it to phase
if(phase>= TABLESIZE) phase -= TABLESIZE;
return phase/TA
le accurate increment. That won't
change the fact that frequencies that don't have an integer-sample
period will look different each cycle.
Ross.
On 9/04/2012 11:28 PM, Julian Schmidt wrote:
Hello all,
I'm trying to get an oscillator running on the STM32F4 discovery boar
Hello all,
I'm trying to get an oscillator running on the STM32F4 discovery board.
I'm sending my audio with 44100Hz via I2S to the onboard codec.
However I'm experiencing strange problems.
my code ist quite straight forward:
phase += phaseInc(440); // calculate the phase increment for 440 hz a
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