Related to the calculation, verification, usage, and requirements for **m**el **f**requency **c**epstral **c**oefficients.

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28 views

Extracting features from songs for a beginner [closed]

I' am working on an machine learning project in MATLAB which requires me to extract features from songs. I'm a complete beginner to signal processing and frankly I'm a little overwhelmed. I' am fine ...
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13 views

MFCC time effect

I am just starting out trying to understand MFCCs in context of an audio recognition (specifically birdsong recognition) problem. I have 10-30 seconds of recorded audio containing bird sounds. Say ...
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14 views

Is BFCC redundant to MFCC?

I have read that $1bark=100mel$ and it has shown to give similar recognition results. Doesn't that mean that bark is redundant? What may the advantages of extracting bark-features instead of/in ...
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22 views

Understanding extraction of MFCC from non-accoustic data

Although a lot of readings (also some advanced explanation in this forum - thank you -) I still have some questions. The sensor captures only one value per time.. So instead of $Time\rightarrow ...
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2answers
52 views

Why discrete cosine transform may not maintain locality

In paper Convolutional neural network for speech recognition, they say I didn't understand the highlighted sentence.
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34 views

Synchronization of two audio tracks via Mel-frequency cepstral coefficients (MFCCs)

I am trying to solve the (common) problem of synchronizing (i.e. measuring the delay between) two audio tracks recorded from different sources during a conference talk (about 1h of audio). One track ...
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57 views

What does the output of Gaussian Mixture Model (GMM) represents in a HMM-GMM based speech recognition application?

Till now I know that- first the speech is converted frames and feature vectors are calculated for each frame using MFCC. And while training the Acoustic model- HMM model is generate for each phoneme ...
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46 views

Applying DTW on MFCC frames

I want to use MFCC (Mel-frequency cepstral coefficients) and DTW (dynamic time warping) algorithms to make a speech comparison script. I calculated MFCC and got 13 coefficients for each frame. How ...
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1answer
60 views

Help using vector quantization

I have a sample signal, and I computed MFCC using this code.Now I have an array of 1225x12 size, where there are 12 coefficients for 1225 frames. Now I want to test another signal against this sample, ...
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1answer
127 views

Speech recognition using MFCC and DTW(Dynamic Time Warping)?

I know basics about DSP, and now trying to complete a project on Speech recognition. So I read as many resources as I found, and got some ideas. They are like: take a sample sound and break it into ...
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42 views

What is formula for mel-filter bank (triangle)?

I've been told that a single filter in mel-filter bank is not isoscales triangle. Could you please give me a formula for such triangle filter that is used for obtaining MFCC features?
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49 views

Dealing with MFCC Feature Vectors of different sizes

I am working on a project where I am classifying coughs of a patient as either positive or negative for a certain pulmonary illness. What I have at the moment is multiple cough events, segmented ...
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1answer
144 views

MFCC - Significance of number of features

I have been doing some readings on the computation of Mel-Frequency Cepstral Coefficients (MFCC) and further use of Vector Quantizers (VQ) for recognition purposes. I am however stumped by the method ...
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1answer
117 views

Calculating Delta MFCC, correct formula?

I have seen different formulations of how to calculate delta MFCCs. In general, I want to be consistent in such a way that if I have other features to look at other than MFCCs, the way I would ...
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0answers
39 views

Implementation of DCT for MFCC

I am in the process of implementing MFCC and I'm unsure about the DCT part. This is how I implemented it (using DCT II). ...
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1answer
96 views

How to average MFCCs from different speakers saying the same word?

I am trying to create a simple recognition system. i have recordings of several speakers saying the same word, let's say "west". I compute the MFCC feature vectors of word "west" from each speaker. If ...
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77 views

Single frequencies energy from MFCC coefficients

Is it possible to calculate modulation energy of single frequency or narrow band of them (ex. 200Hz to 600Hz)? The problem is, that I need to check for 4Hz energy modulation in waveform signal (...
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1answer
64 views

Obtaining signal energy modulation for voice activity detection

Im currently working on VAD (voice activity detection) topic. Since I'm beginner in digital signal processing, I've started to wonder if calculating single frame energy (after aplying FFT to it) and ...
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1answer
42 views

Quick question about difference between two implementations of MFCC

I'm trying to learn more about voice recognition, and I was looking this library here and noticed there were two implementations of MFCC (one called mfcc and another called mfcc2). I ran both of these ...
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1answer
89 views

Principal Component Analysis as a step between STFT and MFCC

For computing Mel Frequency Cepstral Coefficients you can use already calculated STFTs as a basis and perform the Mel frequency mapping on it. My question: Does it make a significant difference if I ...
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1answer
150 views

Comparing MFCC Features ,What do they represent?

I know that MFCC features are the spectral envelope of the input signal but I can't understand what do they mean and what do they represent . and if I have two people saying the same word how can I ...
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2answers
53 views

Non Uniformity in MFCC Training Data

I'm currently working on Person Identification, and using MFCC as the feature to my classifier. I have a database full of tagged(with labels) voices, and I use a CSV file to access the respective ...
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2answers
196 views

Framing an audio signal

The first step in MFCC is to split the signal into frames and referring to this discussion on MFCC at this link (Help calculating / understanding the MFCCs: Mel-Frequency Cepstrum Coefficients) @...
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158 views

Using MFCCs in kNN classification

I'm working on adding MFCCs to my kNN classifier. Originally my kNN classifier was using the zero-crossing-rate, centroid, bandwidth, skew, kurtosis. This was about 80% accurate for drum tracks using ...
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36 views

Supervised instrument recognition

Is it possible to use NMF for a sort of supervised polyphonic instrument recognition? I have training data for a timpani and training data for a bongo (or a bongo, snare and box drum). How can I ...
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2answers
388 views

MFCC coefficients

I have read this, this, this, this and this as a reference for computing the MFCC for a given wave file. Although, I am sure the values look wrong. In short I followed the procedure in link 5. <...
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276 views

Verifying MFCC Final Result

I have created a Octave code for MFCC calculation for speech recognition, which takes a wav file as input and then gives the MFCC as the output. But the final results are a bit confusing, so I am ...
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1answer
142 views

Sinusoidal liftering in implementations of MFCC

Some implementations of MFCC apply sinusoidal liftering as the final step in calculations of MFCC. It is claimed that speech recognition can be significantly improved. For instance, if $\text{MFCC}_i$ ...
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1answer
734 views

What is the advantage of applying a Hamming window for MFCC calculations?

I am trying to implement MFCC by following this and I found that there is a step in which signals are divided into frames and then passed on to Hamming windowing process. The reason given there is to ...
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2answers
311 views

MFCC from DFT (FFT)

I want to write an speaker recognition application (based on some password recorded few times for the authorized person). I've decided to do it with C++ and BASS library (http://www.un4seen.com/). I ...
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228 views

Classification SVM

I have a problem with Support Vector Machine classification. I have two classes of children (boys and girls). I use a MFCC function for training (for each class I have 24 coefficients, number of ...
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38 views

Is an MFCC a linear transform?

Can one determine if an MFCC vector represents a combination of two sounds whose MFCCs were previously given? Any guidance is appreciated!
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402 views

Compare two voices and outline their similarity

I am trying to develop an application which records the voice of someone through a microphone. I will have a preset recorded voices for the same words. I then need to compare the real time recorded ...
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1answer
121 views

Why we take different mfcc components in different programs?

Why we take different MFCC components in different programs? Suppose, in a program we take No. of mfcc components = 14.What does it signify?
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1answer
172 views

Why are MFCCs of two equivalent signals completely different?

I have an audio file, of which I calculate 16 (actually 15 because I omit the first one) MFCCs in R. When I stream this file via VLC-Player and Icecast2-Server, receive it in Java (with the Player of ...
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128 views

MFCC help: Same sound, different coefficients?

Problem: I'm getting totally different MFCC coefficients for identical and near identical sounds like several finger snaps or several desk taps. What am I missing? I thought since the timbre doesn't ...
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2answers
96 views

can MFCC coefficients alone be used to do voice detection?

Aim of my project is to differentiate between cases of silence, single active speaker and multiple ( simultaneous ) active speakers using as basic ( but effective ) logic as possible. Is it possible ...
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1answer
310 views

Detecting phones in a word audio

I am working on speech recognition for Hindi language. My approach is to map speech to text based on phones. For this, first split the speech into the words and then map each word to text by detecting ...
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2answers
351 views

Vowel detection using MFCC

Does anybody know a simple way to recognize vowels from MFCCs? (not words, just phonemes: a,e,i,o,u). I heard this is a vastly known problem in DSP with several solutions like SVM, GMM and cosine ...
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1answer
418 views

Mel filter in MFCC - is it necessary?

Is it necessary to use filter bank in MFCC process? Can anyone explain what is the Mel filter? I know that frequency in hertz is converted into Mel scale but is this formula can be directly applied ...
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1answer
2k views

Cepstral Mean Normalization

Can anyone please explain about Cepstral Mean Normalization, how the equivalence property of convolution affect this? Is it must to do CMN in MFCC Based Speaker Recognition? Why the property of ...
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1answer
93 views

DCT step in MFCC process

During MFCC process FFT is done to get the power spectrum but last step is DCT in order to get back to time domain. Cannot DCT be used in the first case to convert the signal to frequency domain?
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98 views

Features for speaker recognition

I'm trying to create my own program for speaker identification (text-independent) and have used MFCC features for that. But result of recognition is very poor. My supervisor told me that using MFCC ...
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1answer
576 views

Feature vector for MFCCs

I am working on a project, for which I am finding the onset times of an audio and then extracting the MFCC coefficients for all the times. Thus if I have n onset times, I would have n feature vectors,...
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2answers
98 views

Determine the time length of audio training samples?

Currently I am trying to use MFCC feature for audio training in order to do human voice classification (can later distinguish the person who speaks). I have problems to determine the proper time ...
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2answers
149 views

How to organize MFCC features?

I have computed 12d-MFCC features on 3 consecutive audio frames, say: ...
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1answer
159 views

MFCCs and chord recognition

This is my first time working with Mel-frequency cepstral coefficients and I have two questions.... Are some of the 13 coefficients strictly related to some sound properties like frequencies, ...
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1answer
166 views

Speech recognition using mfcc and neural network [duplicate]

I am doing the project on speech recognition.I have implemented both the mfcc features and neural network.I am a bit confused in joining the two blocks.For example i have three different words with ...
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1answer
308 views

MFCC extraction for speaker verification

Regarding extraction of MFCC from speech signal... I have checked for the detailed procedure of extraction of MFCC from http://practicalcryptography.com/miscellaneous/machine-learning/guide-mel-...
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1answer
207 views

Regarding MFCC feature of a speech signal

I am trying to implement speech recognition but I'm struck with a few questions: There are 12 Coefficients of MFCC. What are their names? What is the range of values of MFCC coefficients? If I ...