Using Multirate algorithm for doing pitch shift effect ?

Started by Eudes in comp.dsp16 years ago 18 replies

Hi, I'm trying to implements a pitch shift effect (up / down a .wav sound 44100Hz 16bit to different semitones in the range of around 1...

Hi, I'm trying to implements a pitch shift effect (up / down a .wav sound 44100Hz 16bit to different semitones in the range of around 1 octave). My problem is that I need to do it on about 15 sample simultaneously in real time. The classic pitch shift algorithms use too much of processor time. As my samples are looped, I don't care about the lenght modification of my samples. That's why, ...


pitch detection

Started by Giovanna in comp.dsp17 years ago 1 reply

Hi! I'm currently working on a project for the extraction of some features from a .wav file,implemented in matlab. Someone know where can I...

Hi! I'm currently working on a project for the extraction of some features from a .wav file,implemented in matlab. Someone know where can I find a good pitch detector? I've found something on the web,but it's all for speech,or it works bad. Thanks G


Real-time speech pitch tracking... what library you suggest? does aubio work?

Started by Anonymous in comp.dsp14 years ago 1 reply

Hi, I am looking for a free code/library preferably under linux for speech pitch tracking. The best match I have found so far is "aubio"...

Hi, I am looking for a free code/library preferably under linux for speech pitch tracking. The best match I have found so far is "aubio" library. However, it seems to be mainly for music applications. Does it make a difference to usea pitch tracker for music vs speech or they are generally the same? If any one is familiar with aubio I would appreciate if you let me know whether it works fo...


HELP!!! read/write WAV files for pitch shifting

Started by Anonymous in comp.dsp14 years ago 5 replies

Hi, i'm currently working on this project which involves reading a wave file, converting the data into a range of [-1,+1), then using STFT...

Hi, i'm currently working on this project which involves reading a wave file, converting the data into a range of [-1,+1), then using STFT to do pitch shifting, then play the pitch-shifted wav file. I have already found information on STFT but it requires .wav being read into integer arrays, then FT it into another array. Where can i find source codes or examples on reading, writing and pl...


lpc vocoder.clarification needed.pls

Started by Anonymous in comp.dsp14 years ago

Hi i'm using lpc vocoder for my speech recognition. If i'm doing only alphabet A-Z, I only need the encoder part. Is that correct? As i...

Hi i'm using lpc vocoder for my speech recognition. If i'm doing only alphabet A-Z, I only need the encoder part. Is that correct? As i know, lpc vocoder determine the lpc analysis and pitch detector. If i wan to get the coefficients only for my neural network recognition, I dun need the pitch detector rite? The pitch detector which is to detect voice, unvoiced is for the synthesis part....


Modification of signal using short term Fourier transform

Started by Anonymous in comp.dsp13 years ago 1 reply

I would like to do some signal modification applying all of pitch detection, pitch shifting, and filtering (which will depend on the pitch of...

I would like to do some signal modification applying all of pitch detection, pitch shifting, and filtering (which will depend on the pitch of the signal) using the short term Fourier transform. Sadly I haven't ever previously gone beyond simple filtering using the STFT. Is the following link a good place to start reading up material for this sort of project? What would people recommend inst...


Pitch detection of speech buried under white noise

Started by waheed2nice in comp.dsp14 years ago 2 replies

Hi Everybody, Can anybody tell me about a pitch detection algorithm which works in noisy environment. Many Thanks in...

Hi Everybody, Can anybody tell me about a pitch detection algorithm which works in noisy environment. Many Thanks in advance. _____________________________________ Do you know a company who employs DSP engineers? Is it already listed at http://dsprelated.com/employers.php ?


Good quality voice pitch-shift algorithms (Digitech, TC Helicon, Eventide)?

Started by Tony in comp.dsp17 years ago 2 replies

Hi, After a lot of searching I've been unable to find out anything at all on the algorithms used by the better vocal harmony / pitch...

Hi, After a lot of searching I've been unable to find out anything at all on the algorithms used by the better vocal harmony / pitch shifters. Can anyone point me to a useful link? Tony (remove the "_" to reply by email)


Vocal pitch detection

Started by ash4work in comp.dsp11 years ago 6 replies

hi I would be happy and thankful if anyone can help me with the following *what algorithm to use for vocal pitch detection *is it possible...

hi I would be happy and thankful if anyone can help me with the following *what algorithm to use for vocal pitch detection *is it possible to implement it in a real time system using TMS320C50 hoping for your reply


Pitch shifting and playyback speed changes FAQ

Started by Richard Owlett in comp.dsp14 years ago 7 replies

A friend came across some software for changing playback speed without distorting pitch. I know I've seen a FAQ that covers the application....

A friend came across some software for changing playback speed without distorting pitch. I know I've seen a FAQ that covers the application. Where should I refer him. He's a musician with a BSEE.


speed, pitch and tempo

Started by gaet...@yahoo.it in comp.dsp15 years ago 11 replies

Hello, I'm looking for a tutorial or any web reference to know more about changing speed, pitch or tempo of an audio signal. Can anyone point...

Hello, I'm looking for a tutorial or any web reference to know more about changing speed, pitch or tempo of an audio signal. Can anyone point me in the right direction? Thanks, gaetano


Analog Pitch Shifter

Started by ryder1650 in comp.dsp13 years ago 21 replies

Is it possible to create a pitch shifter using an analog circuit? I know this site is about DSP's but it seems to have a lot of readers, so...

Is it possible to create a pitch shifter using an analog circuit? I know this site is about DSP's but it seems to have a lot of readers, so maybe someone can help me out. Thanks


Pitch calculation (FFT or autocorrelation)

Started by gjunge in comp.dsp15 years ago 10 replies

Hi, I want to show a Pitch graph/curve of a wave file. I saw that good results can be made by using AutoCorrelation. I have the...

Hi, I want to show a Pitch graph/curve of a wave file. I saw that good results can be made by using AutoCorrelation. I have the autocorrelation function and I also have the FFT function, but I don't know what I should put into the autocorrelation function in order to get a pitch line. I have a wave file (spoken text), and also have the FFT results of the wave file, how can I extract from thi...


Speed Change without Pitch Change

Started by jeffdod in comp.dsp16 years ago 3 replies

Does anyone know of a C/C++ library for taking an audio file and performing a speed change without changing the pitch? Thanks, Jeff Dodson

Does anyone know of a C/C++ library for taking an audio file and performing a speed change without changing the pitch? Thanks, Jeff Dodson


Pitch shifting question

Started by H in comp.dsp16 years ago 11 replies

Hi. I want to do some pitch shifting of some samples I have. I'm trying to avoid the whole sample rate conversion problem. I can hack up...

Hi. I want to do some pitch shifting of some samples I have. I'm trying to avoid the whole sample rate conversion problem. I can hack up the hardware some. Q: Can I just alter the clock and rate that I send data to my DAC *WITHOUT* changing the anti-aliasing low-pass and accomplish my goal? Thank you. Henry.


Verification of the following formula

Started by sia4uin in comp.dsp6 years ago 12 replies

Hello All, Me again! I came across the following formula to calculate pitch from accelerometer signals. pitch = atan2(Ay,...

Hello All, Me again! I came across the following formula to calculate pitch from accelerometer signals. pitch = atan2(Ay, sqrt(Ax^2+Az^2)) Is this correct? Now a slightly complicated stuff. Found this video and it is very interesting and of course it is not for novices like me. https://youtu.be/C7JQ7Rpwn2k?t=1415 How does he obtain Gravity to obtain Linear acceleration? ...


Realtime pitch detection - How does the different algorithms compare

Started by PaulWiik in comp.dsp16 years ago 17 replies

Hi, What I try to do: Type of audio: Solo Vocal music. Samlingrate : 44100 Desired Output : Pitch (frequency), hopefully > =10 detections...

Hi, What I try to do: Type of audio: Solo Vocal music. Samlingrate : 44100 Desired Output : Pitch (frequency), hopefully > =10 detections per second. I've read a lot of discussions on this subject on the forum. As you will probably see in my post, my knowledge in maths are limited. I work as a software developer, but mainly GUI/DB. I started out creating an algorithm without doing much


Pitch recognition of a musical note on a smart phone

Started by mzincali in comp.dsp12 years ago 6 replies

Hi. With limited resources such as slower CPUs, code size and RAM, how best to detect the pitch of a musical note, similar to what a tuner...

Hi. With limited resources such as slower CPUs, code size and RAM, how best to detect the pitch of a musical note, similar to what a tuner would do? Should I use: - Kiss FFT - FFTW - autocorrelation - zero crossing analysis - octave-spaced filters other? Thank you in advance. -mz


FFTs of FFTs

Started by jaso...@gmail.com in comp.dsp15 years ago 33 replies

Hi, A friend of mine was describing a technique for pitch analysis to me today. If the input consists of mostly harmonic components; then...

Hi, A friend of mine was describing a technique for pitch analysis to me today. If the input consists of mostly harmonic components; then it's FFT has, of course, some nice evenly spaced spikes. If you take the FFT of -that-, then you can relate that back to the pitch. My question is: does that technique have a name? Thanks! Jason Cipriani


Need a pitch detection library for windows

Started by itsclear in comp.dsp14 years ago 1 reply

I am writing a guitar tuner program. Is there a good public library for windows to do pitch detection?

I am writing a guitar tuner program. Is there a good public library for windows to do pitch detection?