Accelerometers for maritime uses

Started by pnachtwey in comp.dsp11 years ago 10 replies

I have a customer that has an nautical application where yaw, pitch, roll and heave must be compensate for on the fly. The sensor we...

I have a customer that has an nautical application where yaw, pitch, roll and heave must be compensate for on the fly. The sensor we are looking at is http://www.km.kongsberg.com/ks/web/nokbg0240.nsf/AllWeb/61118F926CD5A6E5C125700B0033CF55?OpenDoc ument See the MRU H and MRU Z. The problem is that these update slowly, every 10 milliseconds, and don't have much resolution, only 14 bits. I am


acid

Started by Lehel Kovach in comp.dsp16 years ago 7 replies

Hey, Does anyone know how Acid/ReCycle works? I understand somewhat the concept behind using markers to playback time segments. But, what...

Hey, Does anyone know how Acid/ReCycle works? I understand somewhat the concept behind using markers to playback time segments. But, what exactly is happening? Can anyone explain to me the playback algorithm of an acid loop and how it plays through a loop at different tempos without changing pitch?


Naive pitch detection.

Started by Les Cargill in comp.dsp7 years ago 11 replies

So I cut .wav files down to chunks of a certain window size/length. Read them in; trigger on some RMS leel, just make an FFT of them, compare...

So I cut .wav files down to chunks of a certain window size/length. Read them in; trigger on some RMS leel, just make an FFT of them, compare the magnitude at the center frequency for notes of the chromatic scale, and this seems to be able to "parse" chords reasonably well. You get spurious notes ( probably harmonics or something *like* IM products ). I would have thought this to be unr...


MELP quality

Started by Brian in comp.dsp15 years ago 13 replies

I have listened to MELP vocoder and found that its consonants are sometimes too weak, sometimes it produces hoarse speech and clicks, and its...

I have listened to MELP vocoder and found that its consonants are sometimes too weak, sometimes it produces hoarse speech and clicks, and its pitch shakes/vibrates which makes it sounds unnatural. Is that typical to vocoders at that bitrate (2400 bps)? Can the above be improved or eliminated? Can anyone recommend a better vocoder at that rate? Thanks, BHD


5th harmonic or something else

Started by noodle22 in comp.dsp12 years ago 20 replies

I have been working on a pitch detector (thanks to all who have helped me along so far) and I have just noticed something when I play a low not on...

I have been working on a pitch detector (thanks to all who have helped me along so far) and I have just noticed something when I play a low not on my keyboard. http://www.studypipe.com/Shared/images/oddpeak.png This looks like I am dealing with the 5th harmonic (4 small peaks and then a big one) but they are not evenly spaced. I did use the "piano" sound which may have some special features...


Mains interference with fft problem

Started by Guybrush in comp.dsp13 years ago 2 replies

I've been working on a guitar tuner program (in C#) which uses FFT for pitch detection. It's all working pretty well except for some interference,...

I've been working on a guitar tuner program (in C#) which uses FFT for pitch detection. It's all working pretty well except for some interference, which I assume is from the mains as it's usually 50Hz. I was wondering what I can use to prevent this. Thanks


peak continuation algorithm

Started by juli...@yahoo.com in comp.dsp15 years ago 8 replies

Hi, For my final university project, i'm working on audio pitch shifting using the FxEngine framework from smprocess and scilab. To succeed...

Hi, For my final university project, i'm working on audio pitch shifting using the FxEngine framework from smprocess and scilab. To succeed in my project, I'm looking for papers, links about the peak continuation algorithm. Thanks for your help, julius


Should there be a frequency shift dependent on microphone?

Started by noodle22 in comp.dsp12 years ago 1 reply

Hi, I am created a pitch detector and I have noticed that I get shifted results depending on which microphone I use. Has anyone else noticed...

Hi, I am created a pitch detector and I have noticed that I get shifted results depending on which microphone I use. Has anyone else noticed this type of behavior? I've created a calibration curve to compensate but the shift did surprise me a bit.


Is formant F always a multiple of F0?

Started by jon222 in comp.dsp14 years ago 2 replies

One question about formant frequency: Is always a formant frequency F(i), i = 1,2.. a multiple of fundamental frequency(pitch)...

One question about formant frequency: Is always a formant frequency F(i), i = 1,2.. a multiple of fundamental frequency(pitch) F(0)? J. _____________________________________ Do you know a company who employs DSP engineers? Is it already listed at http://dsprelated.com/employers.php ?


Analyzing Cross Spectrum for Pitch.

Started by MatthewA in comp.dsp5 years ago 64 replies

Hiya friends! I've got a pretty good cross spectrum happening here. For some reason, I'm still getting false second harmonic readings but...

Hiya friends! I've got a pretty good cross spectrum happening here. For some reason, I'm still getting false second harmonic readings but hey... Anyway, so far I'm just searching for the top magnitude and finding the frequency of the bin. I'm wondering if, once I've found around where a frequency is, if there's a way to hone in on it using phase, etc. I know if I run a narrow


Pitch detection algorithm

Started by Erik in comp.dsp16 years ago 3 replies

Hello! I'm trying to develop an application whose primary purpose is to detect which tone the user is singing (real time) using frequency...

Hello! I'm trying to develop an application whose primary purpose is to detect which tone the user is singing (real time) using frequency analysis, and I wonder which algorithm to use. I analyze samples of approx 1/10 sec. I first tried using fourier transform, but since the frequencies are spread out evenly up to the Nyquist frequency, the resolution is way too bad (approx 3 Hz). I n...


cepstrum vocoder

Started by JCG in comp.dsp16 years ago 2 replies

Does anyone know of a vocoder "standard" that implements the cepstrum, or mlsa (mel log spectral approx). If a standard exist, should it use...

Does anyone know of a vocoder "standard" that implements the cepstrum, or mlsa (mel log spectral approx). If a standard exist, should it use the cepstrum for complete source filter model or just pitch detection?? Any suggestions would be much appreciated. Thanks, JC This message was sent using the Comp.DSP web interface on www.DSPRelated.com


Details on ESPS' get_f0 function work

Started by Dims in comp.dsp11 years ago

Hi! I am experimenting with pitch analysis with the help of ESPS. Can anyone give a few hints? I cannot find in manuals...

Hi! I am experimenting with pitch analysis with the help of ESPS. Can anyone give a few hints? I cannot find in manuals here http://www.ee.uwa.edu.au/~roberto/research/speech/local/entropic/ESPSDoc/manpages/indexes/index. html about in what amplitude range a processing signal should be? Should it be [-1,+1] or [0,1] or [0,32767] or it does not matter? And what the rate of output sam


CD Mixing - DSP or DAC Clock speed variation?

Started by mr_alex in comp.dsp16 years ago 4 replies

HI there, I'm currently working on a university project and am trying to conduct some research into how CD DJ players work by changing the...

HI there, I'm currently working on a university project and am trying to conduct some research into how CD DJ players work by changing the speed of a track playing from a CD. Some research I've conducted has led me to believe that the sample rate conversion and the pitch shifting is done via DSP operations - but as these calculations need to be done in 'real-time' on the fly it would re...


smbPitchShift Pitch Shifting Code Updated to 1.2

Started by Stephan Bernsee in comp.dsp15 years ago 3 replies

Hi all, I hope you don't mind my advertising the new version of the smbPitchShift code here but it is quite widely used and informing all the...

Hi all, I hope you don't mind my advertising the new version of the smbPitchShift code here but it is quite widely used and informing all the people manually (let alone find them) would be a fulltime job. Since the code is free, that just doesn't pay off ;-) Anyway, I'd like to inform you that I have released version 1.2 of the code which incorporates many fixes to problems and errors that h...


Video-equivalent of "pitch-shifting."

Started by Radium in comp.dsp14 years ago 48 replies

Hi: I started a new thread because the previous one started to go into tangent of digital vs. analog but was filled with emotions...

Hi: I started a new thread because the previous one started to go into tangent of digital vs. analog but was filled with emotions and personal vendettas rather than science and logic. So I changed the thread. Anyways, Adobe Audition and voice-changers allow the frequencies of an audio signal to be shifted w/out low-pass filtering or changing the tempo. There are two video-equivalents of...


How to change a voice's pitch in real time?

Started by Piotr Mancini in comp.dsp11 months ago 8 replies

I just learned how to convert an audioclip from a 33.3 rpm vinyl record to 78 rpm,...

I just learned how to convert an audioclip from a 33.3 rpm vinyl record to 78 rpm, here: https://community.adobe.com/t5/audition/converting-33-recording-to-78-how/td-p/9448709?page=1 What I need is similar but probably harder. I am developing a web application based on a segment from a 2013 TV program. Only the first seconds are relevant: https://www.youtube.com/watch?v=8MF04X2aLBw T...


Interpolation by cubic splines

Started by Ross Clement (Email address invalid - do not use) in comp.dsp15 years ago

Is there any reason why cubic splines are a poor method for interpolation of audio signals such as speech or musical instrument sounds? Also,...

Is there any reason why cubic splines are a poor method for interpolation of audio signals such as speech or musical instrument sounds? Also, once upon a time I had a copy of a paper written by someone (if I recall correctly) who worked for E-mu systems talking about pitch shifting. Again IIRC, the conclusion was that for a given amount of computing power, polynomial interpolation would al...


transfer function confusion and MATLAB

Started by Parlous in comp.dsp18 years ago 1 reply

hello - in this pdf paper http://www.telecom.tuc.gr/paperdb/eurospeech99/PAPERS/S11O2/K046.PDF the authors used a particular "pitch predictive"...

hello - in this pdf paper http://www.telecom.tuc.gr/paperdb/eurospeech99/PAPERS/S11O2/K046.PDF the authors used a particular "pitch predictive" filter to remove periodicities in an input signal. It is equation (2) of the paper, and is quite simple looking. I am having a few problems understanding it and how to implement it in matlab. The equation is: H(z) = 1 - (z ^ -P) F(z) where (...


transfer function confusion and MATLAB

Started by Parlous in comp.dsp18 years ago 1 reply

hello - in this pdf paper http://www.telecom.tuc.gr/paperdb/eurospeech99/PAPERS/S11O2/K046.PDF the authors used a particular "pitch predictive"...

hello - in this pdf paper http://www.telecom.tuc.gr/paperdb/eurospeech99/PAPERS/S11O2/K046.PDF the authors used a particular "pitch predictive" filter to remove periodicities in an input signal. It is equation (2) of the paper, and is quite simple looking. I am having a few problems understanding how to implement it in matlab. The equation is: H(z) = 1 - (z ^ -P) F(z) where (z ^ -P) ...