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8 views

Pesq numbers and clean speech comparison to processed speech

I am trying to evaluate my processed speech for my DSP project. My project is an implementation of an MMSE algorithm proposed by Y.Ephraim and D. Malah, "Speech Enhancement Using a Minimum Mean Square ...
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1answer
43 views

Phase Estimation in speech enhancement

I am reading a recent paper titled "Phase Estimation of Speech Enhancement - unimportant, important, or impossible?" by Grekmann et al. published in the 2012 the IEEE convention. The paper proposes an ...
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1answer
22 views

Removing vocoder effect from audio file

There are many tutorials and guides explaining how to create a "robotic" voice by using a vocoder or a mix of filters that change pitch, tempo and maybe add a slight echoed delay. However, is it ...
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0answers
10 views

Why the formula below are critically-damped second-order linear systems?

This is part formula of command-response model (Fujisaki Model): ...
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0answers
46 views

Is speech stationary ? How do I test it in matlab?

I'm taking a "Random Signals" class in school and I've got an simple assignment about speech in matlab. I have been asked to record two files: A single word or sentence. A couple of syllables each ...
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1answer
35 views

Comparing signals recorded using diffrent methods

Suppose we have two signals( focus to audio) recorded with different methods, or more simply, suppose we have two audio signals recorded with different microphone, and we want to confirm that these ...
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1answer
39 views

The logarithm Energy measure in Speech

I am studying the mel-frequency cepstral coefficient (MFCC) and have downloaded a pdf which is related to MFCC from this link. It is about the "ETSI ES 201 108" ETSI ES 201 108 - Speech ...
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1answer
57 views

Parameters for signal analysis

I am extremely new to signal analysis. And before posting I did a lot of reading on signal analysis, FFT and windowing. I am working on my thesis which involves comparison of speech signals lets say ...
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0answers
24 views

Audio Coding of Multiple Frequency Components

I am currently working on a speech coding research project and stumbled upon a problem. I have a signal with high frequency and low frequency repetitive components as well as a voiced speech. I am ...
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1answer
100 views

Detecting changes between voice and music

I have a bunch of audio files that have both speech and music parts (think radio). For instance, a given file might consist of the following sections: ...
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0answers
24 views

peak-to-peak test between two signal

Suppose that we have different signals (Pulses). I would like to study which signal has deterministic peak-to-peak distant (lag). For example A=[1 0 0 1 0 0 0 1 0 0 1] and B=[1 0 0 1 0 0 1 0 0 1] and ...
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1answer
259 views

Voice Audio Detection algorithm

I have to detect speech intervals in large pre-recorded files in my project. I think, there won't be so much noise in the background (audio will be recordered in the room or even in the studio), but ...
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0answers
45 views

Segmenting Audio File - Considering time

I can't seem to figure out where I'm going wrong here.. I have the following spectrogram: I'm trying to segment the spectrogram into 3 parts, essentially, I will just have 3 signals (the ones with ...
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1answer
455 views

MFCC Deltas, Delta-Deltas

I have just a quick question about how to calculate Deltas from MFCC. I have found the formula for calculating deltas here: ...
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0answers
904 views

Adaptive Delta Modulation For Speech Signals

I need to implement an adaptive delta modulation encoder and decoder using matlab for my term project. How can I code a good adaptive delta modulation? How can I change ...
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2answers
150 views

Algorithm to detect if a spoken phrase matches a previously spoken phrase

I would like to create a very simple system that allows a user to train (once or multiple times) a spoken phrase (from 1 word to a whole sentence.) Then the (same) user would speak the phrase back, ...
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1answer
59 views

Non human formant frequencies

Some animals are specially trained to repeat human phrases, others just make sounds that people interpret as speech. In this video a rooster seems to say "Cristo Viene" (Christ is coming). Taking ...
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1answer
490 views

How to compare vocal words in matlab

We as a group are new to signal processing and speech recognition. We have stored .wav sounds of three different words and we are trying to record a new .wav sound and have the system compare the ...
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0answers
875 views

MFCC calculation (edited)

I've got a project and need to calculate MFCCs. I tried to read some tutorials and then make a MATLAB function but I seem to have wrong answers. I'd like to feed MFCCs to one of the classification ...
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2answers
627 views

Using DTW on the MFCC's to match a spoken word to a template

I am trying to code a simple algorithm in Matlab that would be used to detect a single word. The goal would be to have a user record the word one time to act as a template, then make the user repeat ...
2
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1answer
54 views

Speech Overlap Detection

I’m trying to figure out how to go about differentiating between a single-voice speech and a multiple-voice conversation in which voices overlap. In other words – the moment of overlap is what I’m ...
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1answer
176 views

Speech discrimination from animal sound

i am looking for discrimination of speech from animal sound if you take a 150ms frame of speech and bird as shown below, what feature can i extract from them so that i can effectively state the ...
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1answer
361 views

Relationship between frame rate and sampling frequency in speech signal processing?

While I was going through the short time processing of speech signals, I got stuck at the relationship between the frame rate and the sampling frequency. Is there any relationship between them for ...
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0answers
38 views

Speech signal Quality & Speech signal improvement

I'm trying find authoritative references for [1] Which analyzing techniques (time/frequency domain) i should use for determining the quality of a speech signal. [2] Which algorithms i should run ...
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2answers
178 views

PSOLA how to calculate synthesized Marks

I have successfully extracts all Pitch Markers from waveforms, I used autocorrelation to find my pitch periods, The markers can be observed in the figure below: I want change my signal (Pitch or ...
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2answers
256 views

Why do envelope extraction before pitch detection?

I am referring to this report on pitch estimation. The author does envelope extraction using Hilbert transform before applying AMDF. What is the advantage of doing that? Is speech a narrowband ...
2
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1answer
206 views

Estimation of Glottal Closure Instant

Glottal Closure Instants (GCIs) are referred to the instances of significant excitation of the vocal tract. I have seen in some papers that I can measure instant of glottal closure in a voiced segment ...
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2answers
923 views

When should I calculate PSD instead of plain FFT magnitude spectrum?

I have a thirty-second speech signal that was sampled at 44.1 kHz. Now, I would like to show what frequencies the speech has. However, I'm not sure what would be the best way to do that. It seems ...
2
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1answer
116 views

Speech segmentation for speaker recognition

I'm trying to implement a speaker recognition system and want to make sure I'm aware of the latest trends in speech segmentation. I've read a number of very different methods at a higher level but I'm ...
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0answers
31 views

Examples of cases where “invariance to transformation” on signal is important

I realize that this might not be the most well-formulated question, but I figured I'd throw it out there as an open-ended discussion that could turn up some interesting input. I'm relatively new to ...
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1answer
115 views

Speech Recognition - Subtitles

I am looking for ANY advice anyone can give me regarding on this problem. I'm looking to start a project on subtitles, basically, if we take a Youtube video of a breaking news story, subtitles are ...
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1answer
244 views

Removing surrounding noises from voice recording

I have a wave file whose frequency spectrum looks like this. It contains audio, which I want to keep while removing the rest. The problem is that the surround noise changes, just those distinct ...
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1answer
160 views

Speech recognition library for detecting phrase in file

I want to find all occurrences of a specific phrase in a set of audio files (it's a catch-phrase in a TV show). The phrase is pronounced by different people with different speed etc. What is the best ...
5
votes
1answer
140 views

Detecting the original bandwidth of upsampled recordings

I have a set of recordings sampled at 16khz, but some of them are upsampled from 11khz and some from 8khz. Quite some of the recordings are noisy. What is the best way to classify the recordings ...
2
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0answers
91 views

Summer Projects - Suggestions

I'm looking for some suggestions and wondered if anyone had any ideas. I have just completed a project in Speech Recognition using MFCC, Dynamic Time Warping and Hidden Markov Models etc.. (Some of ...
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1answer
82 views

Format location from LPC magnitude

I am confusing when I find the lpc roots magnitude, f1=0.9313, f2=0.9308, f3=0.91 and f4=0.95 but when I look at LPC envelope the f1 is higher than f4 in term of magnitude in dB. Could anybody explain ...
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1answer
372 views

what is probability density function (PDF) of periodic signal

anybody knows what is the best pdf for periodic signal ? I have signal with 480 samples (16000*0.03=480) but I could not find the exact pdf for that. sometimes it appear like 2 mixed Gaussian.
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1answer
104 views

Detect when someone has stopped talking

What's an extremely efficient way of detecting when a user has stopped talking into a microphone? When I use systems like Siri it can detect when I've stopped talking almost immediately, even when ...
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1answer
81 views

Establishing Phrase Frequency in Audio Files

Is there any Application, Programming Library or Theory that could be used to identify human language phrases in a set of audio files, so as to calculate the frequency of occurrence of each such ...
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3answers
189 views

Why does the excitation signal appear, separated, at high quefrencies in the cepstrum?

So, I've just begun a speech and language processing course and have found the explanation of the process of getting the cepstrum of a signal and its properties a little confusing. The following is a ...
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1answer
64 views

How to compare two speech recognition softwares?

I am working on building speech recognition software for my company. In the meantime however, we will purchase some off-the-shelf commercial speech recognizers until the in-house one is ready. My ...
5
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2answers
243 views

What do colored noises look like in the time domain?

I understand that the time domain representation of white noise looks like impulses. How do colored noises like brown, pink etc. look like when we perform an inverse Fourier Transform on them ? What ...
2
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2answers
213 views

Emotional Tone detection using audio on mobile phones

Which audio features should be used to detect tone from audio? Are there any open source frameworks or implementations which can be ported to mobile phones to process audio? Alternatively, would it be ...
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0answers
175 views

Detect human speech in realtime audio on mobile phones

I am looking to develop an Android app. As part of the functionality the app would require to randomly sample 3-5 seconds of audio and classify it as containing human speech or not. I understand that ...
3
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1answer
247 views

Identifying the age of a speaker using speech recognition

I am just wondering if it's possible to gather the age group of someone speaking in a sample? For example, could I tell whether the sample is a child, teenage, adult, etc?
5
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1answer
255 views

how does this equation correspond to smoothing?

Please help me understand smoothing of data. This is a follow up to my previous question posted here. Especially the top answer by Junuxx where he says a way of smoothing a function $f(x)$ is: $$ ...
2
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1answer
258 views

Speech Recognition Project - HMM

I am looking for advice on a project I am thinking about completing (for experience etc..) My project is triggering a set of traffic lights (simulation) using Speech recognition. In theory, I want to ...
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1answer
382 views

Calculating the total energy of a signal

I have a vector of signals and need to calculate the total energy. I have read somewhere that you can do this by summing up the entire vector and then finding the absolute value of the result. Is this ...
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1answer
94 views

HMM's - Possibility?

I have a basic understanding of HMM's and as a final year project at school wanted to expand my knowledge further. My basic idea was to create an algorithm that determines if someone is saying ...
0
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1answer
378 views

Speech Analysis - Zero-Crossing

Basically, (I know I've asked a simular question, but I have been away and really thought about it this time)! Let me try and explain this in the best way possible: Basically, I'm attempting to ...