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Questions tagged [speech-recognition]

Speech recognition is the process of converting the spoken word to text, usually without regard to a particular speaker (which is more commonly referred to as "voice recognition").

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1answer
470 views

Hidden Markov Model for Speech Rcognition. HMM Number of States

This is a question that came to mind as a result of a previous question Hidden Markov Models - Distinct Observation Symbols and subsequent answer from @pichenettes. One approach to speech recognition ...
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1answer
737 views

Hidden Markov Models - Distinct Observation Symbols

I really, really hope someone can help me with regards to this question. I'm trying to implement a Hidden Markov Model (based off this paper: Here I understand the processes, but, I do not ...
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2answers
663 views

Dynamic Time Warping - Comparing Values

Ok, so I'm trying to compare two different speech signals and I have come into a problem. Here goes: I have split the signal into blocks, and I have computed the MFCC coefficients of each block. I ...
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3answers
310 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
108 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 ...
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1answer
1k views

Voice Recognition - MFCC

I have been researching about Speech Recognition and I have decided to take the MFCC approach to solving this problem of detecting whether someone is saying either "Yes" or "No". So as mentioned ...
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1answer
312 views

Hidden Markov Models - Identifying Phonemes

I'm developing a project that identifies Phonemes to be able to identify whether someone is saying either "Yes" or "No". So far in the project, I have used Zero-crossings to identify what the person ...
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1answer
767 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: $$ f'[...
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1answer
576 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
88 views

Signals - Removing Blocks

I'm after some advice on a problem that I am facing regarding signal processing. I am processing a voice clip (.wav) and this voice clip contains noise, and I need to remove the noise and just ...
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1answer
1k views

Automatic Gain Control for voice

I am tasked with designing the logic for an automatic gain control. It won't be a traditional AGC in that it has to run on a computer and continuously modifying the volume is not possible in the same ...
0
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1answer
288 views

Frequency/harmonic analysis of accents

I am looking to find out how accents could/would be detected by a programme, I haven’t as of yet undergone an experiment into detecting or observing anything noticeable about recorded accents. I am ...
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3answers
18k views

human speech noise filter

Does anyone know of a filter to attenuate non-speech? I am writing speech recognition software and would like to filter out everything but human speech. This would include background noise, noise ...
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1answer
1k views

Determining how similar audio is to human speech

While looking for an answer to this problem, I found this board so decided to cross post this question of mine from Stack Overflow. I am searching for a method of determining the similarity between ...
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1answer
364 views

Designing a feature vector for discriminating between different sonic waveforms

Consider the 4 following waveform signals: ...
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3answers
10k views

Is there any free software that can recognize and classify sounds?

i am making a smart home automation software and i would like to know if there is any software that can recognize noises such as speech ,playing music,phone ringing etc The exact software i am looking ...
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2answers
553 views

How to Filter Human Speech from an Audio clip?

I'm looking for an open source library to detect Human speech from an audio clip, such as a wav file.
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1answer
3k views

how important is the pre-emphasis stage in MFCC?

I wrote a simple MFCC routine, using all the steps usually suggested in the literature with the exception of the pre-emphasis stage. How important is this stage? Also, some authors suggest that using ...
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2answers
242 views

How do the English pronunciations of “tiu” and “tou” differ?

I'm creating an app (I'm a software developer) that for different sounds (interjections from the user) will do different things. For example if the user says: "Tiu", than it will do task A, if it ...
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1answer
949 views

Vector Quantization in Hidden Markov Models

In the field of Gesture Recognition and Speech Recognition (using HMM classifiers), do multiple HMM classifiers (one for each class) share common Codebook (i.e common set of symbols) in Vector ...
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3answers
3k views

How to simulation different kinds of Noises in speech signal?

What are the different kinds of noise in speech signal? How can I simulate the same in Matlab for adding to a clean speech signal?
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1answer
267 views

How to segment phone call audio into silence/non silence?

My problem is that I don't know the energy of the background noise, so I can't just threshold the energy. The processing is done in real time, and I have about 500msec to decide. Ideally, I'd want ...
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2answers
482 views

What does a “vector” in a hidden Markov model mean?

I know that a Hidden Markov Model (HMM) is used in speech recognition and understand it to some degree. However, what I don't know is how input (speech) is "transformed" to a vector which in later ...