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The fundamental frequency of a periodic or quasi-periodic function is the reciprocal of the shortest period of the periodic function.

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38 views

Note detection in an audio file.

I am trying to find the given note in an audio file. It has been specifically told that each file contains only one note. So i directly took fft and found the corresponding frequency and then mapped ...
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1answer
72 views

Discrete Harmonics Concepts

If we add $2 \pi $ to the discrete frequency $ e^{j(\omega_0+2\pi k)n} $ it gives the next frequency, why is this true? For continuous domains $ e^{jk\Omega_0n} $ gives a complete set of orthogonal ...
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1answer
29 views

how to create a harmonic mask from fundamental frequency?

Using an algorithm that gives the fundamental frequency across time, example https://www.mathworks.com/help/audio/ref/pitch.html (or some other one?) how would I then use that, to create a harmonic ...
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2answers
86 views

How do I find the fundamental period of the given signal?

I am having a problem in finding the fundamental period of the signal $x(t)$ given below: \begin{align} x(t) &= 2\cos\left(\frac 45 \pi t\right)\sin^2\left(\frac{16}{3} t\right)\\ &= 2\cos\...
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1answer
77 views

YIN pitch estimation algoritm-simplified explanation [closed]

can someone please explain the steps of YIN pitch detection algorithm in a simple way "especially the last 3 steps". here is the research paper of YIN algorithm http://audition.ens.fr/adc/pdf/...
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0answers
100 views

What are F0 counters in Speech signals? What is represented by F0?

I can't find any dedicated definition for Frequency F0 counters. Can anyone tell me what does F0 exactly mean, I am confused about that.
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1answer
33 views

Speech Processing applications: stereo data for features

I am working on speech databases that have a stereo format. I want to extract spectral information (Mel-filterbanks, MFCC, LPCC) and also some other prosody features like the fundamental Frequency F0. ...
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2answers
116 views

Pitch perception - Why does our ear not directly detect the missing fundamental frequency?

My motivation for this question is related to biological phenomenon of our inner ear, so I initially posted in the biology community, but I suspect the answer has a DSP explanation, so I figured this ...
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1answer
183 views

Octave: Finding the mean fundamental frequency given an audio signal

I have an audio .wav file of someone's speech of which I want to find the mean fundamental frequency. Till now, all I have managed to do is load the data into a vector and (roughly) filter the silence ...
3
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2answers
674 views

Finding the fundamental frequency of a periodic signal

Suppose we have the signal $$x(t) = e^{j\omega_1 t} + e^{j\omega_2 t} + e^{j\omega_3 t},$$ where all the frequencies are rationally related (that is, the ratio of any pair of frequencies is a rational ...
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1answer
564 views
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0answers
37 views

what is the relation between autocorrelation lags and fundamental frequency?

I am studying autocorrelation based feature paper. In that they extracted autocorrelation feature and after that they plotted graph lags vs fundamental fundamental frequency...I am not getting ...
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3answers
1k views

How to change speed of audio samples without changing pitch? [duplicate]

This question may be more appropriate on music stack exchange but since sound is a branch of physics and this is more of a technical question relating to sound waves than a musical question I asked it ...
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2answers
119 views

Explanation of fundamental filtering's consequences on signal

Can anyone explain why exactly an "Overshooting" phenomena is observed when the fundamental harmonic is removed as seen on the figures? Is it technically right to call this "overshooting" at all ? If ...
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0answers
30 views

Normalizing different frequencies to a fixed one

I'm doing a neural network about frequency ($f_0$). The current problem is that it performs well with same sex speech data, but poorly with mixed sex one. I assume the problem is caused by different $...
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1answer
89 views

Better way to mute fundamental baseband frequency?

I'm working on a project to monitor the fluctuations and harmonics present on standard 120VAC mains power. I built an adapter that drops the voltage from 120VAC to 12V and then down to 0.5-0.6 VAC ...
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1answer
106 views

fundamental frequency contour of a syllable [closed]

I have an audio signal and I want to calculate the fundamental frequency contour for each syllable. In the related paper is said that only 9-time points are required. (9 values of frequency contour in ...
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1answer
129 views

Identify fundamental frequencies in short-period waveform

Maybe I'm being stupid and failing to see something here... I need to analyse a signal over a relatively short time period (~1-2 cycles for the lowest frequency, perhaps 20-30 cycles for the highest ...
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0answers
163 views

How to calculate correlation between frames , PDA algorithm

I am working on an assignment in which I am asked to calculate, per frame, the modified correlation between the signal's frames as following: ...
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2answers
1k views

How to deal with low fundamental when using AMDF for pitch extraction?

I am using the Average Magnitude Difference Function to estimate the fundamental frequency of a quasi-periodic audio signal. The AMDF is defined as $$ D_n = \frac{1}{N-n}\sum_{k=n}^{N-1}|S_k - S_{k-n}...
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0answers
49 views

Using FFT to determine frequency [duplicate]

I'm pretty new to digital signal processing, my degree touched on it briefly, but it's interested me since. I am trying to determine the fundamental frequency of a guitar note played into a mbed ...
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2answers
258 views

How to represent ratio between harmonics in audio spectrum

I was provided a report where the amplitudes of spectral harmonics have been extracted from several audio files. The amplitudes have been extracted using Audacity's spectrum visualizer, where the ...
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1answer
342 views

DFT: Basis functions and Significance of dividing frequency by Sample length

A time domain signal can be decomposed into sinusoids which are based on basis functions. For a N sampled input, a cosine basis function is defined as: $$C_k[i] = \cos\left[\dfrac{2\pi k i}{N}\right]...
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4answers
1k views

Advice on autocorrelation via FFT

I have been creating an application in Java that transforms an audio signal and writes it to a midi file. At first I tried using autocorrelation to find the fundamental frequency. However, I have ...
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0answers
304 views

DFT sinusoid's fundamental frequency, intuitively

I am trying to understand, intuitively, the mapping of a sinusoidal signal's fundamental frequency from time domain to frequency domain using $\textrm{DFT}$ formula. Given the time domain samples $\{x[...