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Questions tagged [oscillator]

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0answers
20 views

how to reduce signal noises

I am trying generate guided waves on simple metallic plate through piezo-ceramic material, I place two piezo on the surface of the plate at the different location and through Arbitrary pulse generator,...
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1answer
90 views

NCO loses lock after a while for certain values of alpha

EDIT: So the transfer function for my system is $$ F_{nco}(z)=\beta E(z)/(z-1)$$ $$ z\Theta_{nco} (z)=\Theta_{nco} (z)+\alpha E(z)+\beta E(z)/(z-1)$$ So I would like to obtain $\Theta_{nco} (z) / \...
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1answer
42 views

Denoising Oscilloscope data the right way [python3]

I need to plot large oscilloscope data sets. They are too large (100 million Values) to plot all of them in a for loop. If I try to do that it results in a ...
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0answers
40 views

Signal acquisition equipment phase noise

I would like to check if there is a way to enhance an RF equipment's phase noise figure. The considered RF acquisition homodyne system includes a mixer for carrier demodulation, amplifier and filter ...
1
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1answer
230 views

polyBLAMP anti-aliasing in C++

How should 4 point polyBLAMP work. It does not really seem to dampen aliasing. I have an floating point digital audio oscillator that makes a +1.0f jump at the end of every period. My question is, ...
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2answers
887 views

How to recover frequency and damping coefficient from superposition of damped oscillators?

I have a signal which is (more or less) the superposition of multiple damped oscillators. There are relatively few oscillators involved, 2-3 would account for most of the signal. They have periods ...
0
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1answer
58 views

Is there any special when all Fourier components have the same angle?

When a square wave doesn't jump, its oscillators aren't aligned: But if they are in sync, the wave will jump to its extrema: However this is just an example of square waves. The tool Understanding ...
2
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4answers
87 views

What is the moment when all oscillators aligned to make a jump called?

Say we have a square wave and its Fourier series. When the wave doesn't jump, its oscillators aren't aligned: But if they are aligned, the wave will jump: What is this moment called? They might not ...
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3answers
209 views

How do I stabilize my oscillating system?

I have two scalars $x$ and $y$ that vary with time $t$ such that \begin{align} \frac{dx}{dt} &= ay + b + dx\\ \frac{dy}{dt} &= cx \end{align} but $a, b, c$ are unknown. If $d$ is too small, ...
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1answer
78 views

DC bias of waveform

I have a waveform which is built from a math function. I want to repeat it to make a oscillator. Now to offset it to remove dc bias, do I just make total area equal zero?
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0answers
59 views

Bandwidth enhanced sinusoidal model with oscillators banks

i am currently implementing the bandwidth enhanced sinusoidal model for an additive synthesizer, this model allow to accurately produce noisy sounds by adding a noise component to each sinusoids. But ...
2
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1answer
621 views

How to account for multiple signals in the input to a Kalman filter

I am interested in using a Kalman filter to track an oscillating signal due to a physical oscillator in a signal which contains the signal from multiple such oscillators oscillating at different ...
0
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1answer
120 views

How to implement a digital sawtooth oscillator? [closed]

In reference to this topic: How to implement a digital oscillator?, I would like to know how can I implement a solution similar to the one in the topic on a Sawtooth oscillator.
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2answers
172 views

How to look at Rubidium frequency standard using the oscilloscope?

This question is about the checking hardware, please help if someone who has done it before. I have the Rubidium frequency standard: http://www.thinksrs.com/products/PRS10.htm and the Oscilloscope: ...
1
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1answer
2k views

Numerically Controlled Oscillator (NCO) for phasor implementation?

If I want to simulate a digital oscillator (or phasor) to modulate an arbitrarily length signal: $$y(t) = \cos(2\pi f_ct)\quad\text{where}\quad t = \frac{n}{f_s}\quad\text{for sample}\quad n$$ What ...
1
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1answer
250 views

Resonance circuit peak filter with unity stopband in MATLAB

I would like to insert a filter with an resonant filter characteristic of a realistic mechanic oscillator. I need to apply it in the time domain, e.g. with a function such as ...
0
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1answer
539 views

Generate loopable sine wave cycle for given frequencies

I am somewhat new to DSP so bare with me. I am working on a simple wavetable oscillator. What I am trying to do is generate one cycle of a wave form for each note (frequency) and store it in an array ...
0
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1answer
121 views

Freeform band-limited waveforms

I'm ready to dip my toes in the scary waters of non-aliasing waveforms and wavetables. Ideally, what I'd like to do is create a (naive) wavetable/waveform in memory and subsequently generate band-...
1
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0answers
312 views

What's wrong with my minBLEP Hard Sync Sawtooth code?

I implemented a Sawtooth Oscillator which uses minBLEP - Eli Brandt's original paper The minBLEP approach works very well for a normal Sawtooth but I specifically want to implement Hard Sync and ...
2
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1answer
201 views

Why does signaling overhead for time synchronization scale up with the number of transmitter nodes in a multiple access system?

I was recently reading about random multiple access methods without time synchronisation (of the pure Aloha type). In this paper it is stated that, The need for transmitter synchronization is a ...
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2answers
407 views

Aliasing Square Wave

I'm having a really weird issue with generating waveforms from frequencies C1 to C8. When I generate sine waves, everything sounds good; no problems whatsoever. However, when I generate a square ...
2
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1answer
1k views

Band limited wavetables

I am a bit confused with the concept of band limited wavetables and the methods such as BLET, BLIP, MinBLEP, polyBLEP etc. As far as I understand certain waveforms contain infinite harmonics, which ...
3
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1answer
442 views

how to correct minBLEP sawtooth oscillator DC bias

In my implementation of minBLEP, overlapping minBLEPs result in a DC bias as the frequency increases. This is because each minBLEP correction (i.e. the minBLEP minus the aliased step) has a DC bias. ...
0
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1answer
207 views

efficient triangle to sine morphing?

I'm coding a synthesis external for MaxMSP in C. It's based on Peter Blasser's bounds and bounce concept ( http://petermopar.blogspot.co.uk/2014_04_01_archive.html )- basically triangle waves with ...
0
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1answer
422 views

Best way to morph between waveforms

I am making an low-frequency oscillator (LFO) that should be able to output different kinds of waveforms. If I, say, want to be able to create a smooth transition from a sine wave to a square wave, ...
3
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2answers
2k views

IIR oscillator produces stable output in MATLAB, unstable on chip, how do I tune it?

I'm trying to make an oscillator using IIR filter and I'm having problems tuning it so that it's stable on the platform I'm using (ARM Cortex M4F and CMSIS DSPLib's arm_biquad_cascade_df1_f32). Note ...
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2answers
853 views

Band Limited Table Look Up Oscillator C++

I would like to create a Band Limited Table Lookup Oscillator that functions much like the sin() function in C++ works where i would inout a phase value and receive ...
3
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3answers
261 views

Is sinusoids the nature's default signals?

I know the basic working principle of sinusoidal oscillators. But I have a doubt on this matter when I came across Gram-Schmidt orthogonalization procedure. I have read that the source for sinusoid ...
18
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3answers
8k views

How to implement a digital oscillator?

I have a floating-point digital signal processing system that operates at a fixed sample rate of $f_s = 32768$ samples per second implemented using an x86-64 processor. Assuming that the DSP system ...