Questions tagged [voice]

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1answer
249 views

Quantifying the energy of a voiced frame

What should the energy, pitch frequency, and zero crossing rate of a voice/unvoiced/silence frame in signal be? My professor said that it is experimental, but I do not have any idea what the factors ...
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2answers
337 views

Speech Enhancement Libraries

Is there any speech enhancement algorithm library? I need to process a sound to voice recognition, and I want to remove noise from audio source.
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1answer
2k 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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1answer
232 views

Most accurate method of Voice Activity Detection?

What is currently the most accurate Voice Activity Detection algorithm with high levels of background noise? I would also appreciate if it does not require any manual calibration. Bonus points for ...
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1answer
175 views

How do you choose a size for a windowing function in FFT?

How does one choose the proper windowing function to apply in an FFT? What are the benefits of larger sizes and smaller ones? Which would be the best for pitch estimation? Also which window function ...
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0answers
76 views

Get excitation from two signals

I have two signals, one whisper data and one normal voice data of the same sentence. I'm trying to build a voice conversion, but just want to start off with some simple signal manipulations. I ...
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1answer
85 views

What factors determine synchronous signal transmission ability of a channel?

So I am Designing a system which would be able to send and receive stereo voice signals.( like a telephone but with full-band stereo voice signals) here is an example to make my question clearer. In ...
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1answer
186 views

How to distinguish between recorded and a live vocal signals?

Is it possible to detect if a sample of human voice by smartphone/computer(44Khz) is sourced from another electrical device or originated from a human being I ...
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1answer
93 views

Speech Activity Detection- Adhoc Problem with multi source sounds(birds,trees,heavy air) and how to eliminate them completely

Here i will first try to put my application agenda Typically i am sampling at 8Khz rate and filtering speech components using a BPF(digital) now i have got the 0-4Khz components in which ...
2
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2answers
387 views

Comfort Noise Insertion in VAD algorithms

I am in a intention of Porting Voice Activity Detection algorithm in real time hardware,so i was successful in classifying speech and silence/noise but now the problem is replacement of silence frames ...
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2answers
260 views

In Search of Voice Activity Detection Algorithms - What happens to the frequency or pitch or speech features as speaker moves away from microphone

Actually i am in search of a Voice Activity Detection Algorithm which could distinguish between voice and non-voice Roughly speaking it must not detect even a bullet sound,even a foot stepping and ...
2
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3answers
968 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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1answer
147 views

Measure of harmonicity in a time-series

I'm analyzing speech signal for identifying voiced and unvoiced regions. Voiced regions are supposed to have a "pitch", which can be estimated using auto-correlation function (ACF). Basically, one ...
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1answer
101 views

voice recognition

during Zimmerman trial, each camp claimed the yell for help recorded belonged to their side. given that Zimmerman is still aside and the recording still exist, could there be some scientific way to ...
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2answers
2k views

voice pattern matching algorithm

My idea is to find a word in wav/mp3 files. It is just one word. I have a database with a few hundred songs. I am looking for pattern matching (this is not an exact pattern) it can be an word i ...
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0answers
2k views

Filtering voice signal from randomly added frequencies

I have this assignment that I can't figure how to solve. I have a sound.wav human-voice file, and use matlab add-random-noise (monotonic) Goal: to remove the noise from the sound (and the sound from ...
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1answer
556 views

Detection of regions of voice in music

I want to detect the regions of voice in a song. Currently, I am using the fact that the vocals in the song are recorded as center panned. So, I am removing all center panned audio from the song. ...
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2answers
1k views

How does Songify work?

Does anyone know how does the "Songify" app algorithm work? There are 2 inputs: speech (or amateur singing), and underlying music. Somehow the speech is altered and mixed into the music. Which DSP ...
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1answer
2k views

About voice filtering

I have a waveform containing voice some children screaming some times when there is no noise at all some times there are cars driving by when talking I want to detect the start and ending times of ...
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1answer
101 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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4answers
86k views

How to mimic/copy/fake someone's voice?

Is there any existing application to sample someone's voice and use it to modulate any other voice or synthesize a text to resemble the original one? For example, this Text-to-Speech Demo by AT&...
6
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3answers
298 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 ...
4
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1answer
873 views

Acoustic features distinguishing the male and female voice?

I would like to use MFCC analysis to distinguish between a male voice and a female voice. Are there any particular quantifiable characteristics consistent with, and exclusive to, either gender? (E.g....
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3answers
2k views

Filter message from noisy voice signal

I am trying to decipher a message hidden within a very noisy audio file(.wav)(I think it is white noise with an additional low drone). The message is a six digit number. I have not have any further ...
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3answers
6k views

How is a human whistle a pure sine wave?

According to Wikipedia human whistling is a pure sine wave. If that is true and if a human is whistling and produces a rhythm like any song, is he still producing a pure sine wave? For example, if I ...
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3answers
228 views

Why are the bass components of music more audible than other components?

Consider a situation where I am listening to loud music in a room. If I move into another room and close the door (so music is now played in another room behind the closed doors), I will hear the bass ...
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2answers
6k views

How is it possible to Filter out a person's voice out of 100 of other voices?

So, I've just learned that the human voice is not a single sine wave its a bunch of unlimited Sine waves each having a different frequencies, According to Wikipedia, The voice consists of sound ...
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1answer
4k views

Library to differentiate people by their voice timbre

Say there are 3 people in the room. Each of them have a unique voice timbre. I want to recognize people by their timbre and know who's speaking.
7
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1answer
3k views

Speech Compression - In LPC how does the linear predictive filter work on a general level?

Hi I'm taking a multimedia systems course and I'm preparing for my exam on tuesday. I'm trying to get my head around LPC compression on a general level, but I'm having trouble with what is going on ...
9
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1answer
1k views

Theory behind Linear Predictive Coding (LPC)

What is the theory behind LPC? Why are(were) certain implementations of LPC said to be more tolerant of transmission or encoding errors quantization than other compressed voice encoding schemes? ...
22
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4answers
5k views

How to distinguish voice from snoring?

Background: I'm working on an iPhone application (alluded to in several other posts) that "listens to" snoring/breathing while one is asleep and determines if there are signs of sleep apnea (as a pre-...
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4answers
11k views

Programming a Vocoder

I'm want to program my own vocoder synthesizer like "Songify" but I can't find a simple of vocoder algorithm. Maybe you can explain or tell where to look for information on how vocoder works.
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3answers
2k views

How is a “good” or “bad” singer defined in signal processing terms?

I was watching the American and Indian idol auditions on youtube earlier in the day. I watched both successful and failed contestants and I was able to distinguish the really bad from the good singers ...