# Questions tagged [pitch]

Pitch of an audio signal representing a musical note, measured in units of octave and relative to a pitch standard such as A440, is the base-2 logarithm of the frequency ratio of the fundamental frequency of the note to the frequency of the pitch standard.

167 questions
Filter by
Sorted by
Tagged with
17 views

### Deciphering the (pre-Viterbi) HMM in Probabilistic YIN (pYIN)?

I'm having slight difficulties in inferring all the details of the HMM part in Probabilistic YIN (http://eecs.qmul.ac.uk/~simond/pub/2014/MauchDixon-PYIN-ICASSP2014.pdf) in order to understand the ...
• 1,314
103 views

### What *is* pitch-shift?

As I understand it, pitch-shifting (without changing speed) and time-scaling (without changing pitch) are two sides of the same coin, because if we can do one we can get the other through resampling ...
• 151
23 views

### What's the state of the art way to detect / change audio pitch? [duplicate]

Detecting pitch: It seems that selecting the modal frequency in the frequency spectrum is too simple an algorithm for reliable results. For detecting, and changing, the pitch of a note, what are the ...
• 109
1 vote
65 views

### Confusion regarding STFT phase vocoder-based pitch shifting

I'm currently working on a phase vocoder implementation based on the Short-Time Fourier Transform; it's heavily based on the models described here and here. I have successfully completed the analysis ...
64 views

### Introducing Feedback to Miller Puckette's Time-Domain Pitch Shifting Algorithm without Discontinuities

I've implemented Miller Puckette's time-domain pitch shifting algorithm (http://msp.ucsd.edu/techniques/v0.11/book-html/node125.html) in PureData's help files in C++ (my code here: https://github.com/...
• 1,093
162 views

### Software implementation of pitch correction

I have a question about the physics of pitch correction of sound. My background is physics, I'm mostly active on physics.stackexchange. (Check out my profile.) The background of my question: Before ...
• 121
137 views

### How timbre shifting is done?

I've recently came across two programs - Morphvox, VCSdiamond that are able to preform pitch shift, but also timbre shift. As far as I know the timbre is nothing but the amplitude of the harmonics in ...
• 31
108 views

### Audio Processing - How to create a spectral pitch display?

I want to create an application that analyzes human voice pitch, but spectrograms are very noisy. However, in Adobe Audition, there is a feature called the spectral pitch display, and it successfully ...
• 143
152 views

### Periodic signal detection algorithms?

I am currently working on pulsar signal periodicity detection. Most of the literature which i studied used traditional FFT (Fast Fourier Transform) or (Epoch Folding) techniques to find the ...
1 vote
74 views

### What is the "chirped response FIR filter"?

In Pitch synchronous split-band LPC (PS-SBLPC) vocoder the authors describe an algorithm to identify pitch cycle boundaries. In "Pitch cycle detection" section, this sentence describes ...
• 111
122 views

### Why, for a musical instrument, the first harmonic has more power than the fundamental and last longer?

In analyzing the audio recording of a string instrument, I am struggling with pitch estimation. I am using the pYIN algorithm and every pitch estimation I'm obtaining is off by one octave. I assume ...
64 views

### FFT behaving weirdly for frequencies below 100Hz

I've written a simple program to take an audio file, and calculate the most prominent frequency for every 0.1s interval. My audio file has a sampling rate of 48000, and am taking datapoint windows of ...
• 103
573 views

### What is a "pitch period"?

The term pitch period appears in the book Speech and Language Processing by Daniel Jurafsy: As we just said, a pitch-synchronous algorithm is one in which we do something at each pitch period or ...
221 views

### Resampling pitch shifter

I’m trying to build a very basic resampling pitch shifter which reads samples from disk. I only want to change -+6 semitones without keeping the original sample length. I already have all the classes ...
• 103
93 views

### How to determine if certain notes exist within polyphonic music?

Given a segment of audio, if you were to calculate the histogram of frequency amplitudes for all standard musical note frequencies present in the audio, how would you check to see if 2-3 specific ...
• 588
733 views

### Python: How to generate log-frequency spectrogram from an audio?

I want to make a log-frequency spectrogram out of this audio. Later, I need this spectrogram for pitch sequence analysis. This is a sample sequence I want to achieve: ...
525 views

### Implementing a pitch shifter

I am trying to implement a pitch shifter similar to this one, in MATLAB for quick prototyping. My goal is to do the reverse, but I assume it is similar. The implementation details are missing. So I am ...
• 141
1 vote
89 views

### Produce musical signal from instantaneous frequency

I'm implementing the Yin Algorithm in Python so as to extract the pitch of my voice when whistling or humming. My goal is to produce the Gate (Envelop Control) and CV (Pitch Control) signals which can ...
• 265
1 vote
118 views

### Obtain Envelope and Pitch curves of my Singing Voice

I wish, in real time, to hum into a mic and produce via dsp the envelope and pitch of what I am humming, before outputting these two signals to my analog synth. This synth takes a gate and a cv signal....
• 265
869 views

### Is PSOLA or WSOLA better for vocal stretching/retuning?

I'm looking to implement a time-domain pitch modification algorithm such as PSOLA (Pitch Synchronous Overlap and Add) or WSOLA (Waveform Similarity Overlap and Add). At the moment I'm using PSOLA, but ...
50 views

### Why does toning up a piano make it sound similar to that a string instrument

I have a .wav file of a piano being played at 220 hertz. When I tone this up to 880 hertz, it begins to sound "stringy". However, if I were to use the piano plugin in fl studio and play it ...
• 3
1 vote
48 views

### Pitch correction using Fast Foruier Transform [duplicate]

I am very new to digital signal processing and I have a project about audio programming. For the project, I wanted to try to make an Auto-tune like effect. I started by experimenting on the signal ...
97 views

### How to difference a loud sound (playing notes), from a soft noise in spectrum. (Pitch detection with bass)

I'm trying a program that outputs the bass line that you are playing. I have some arrays from a big one with the sound in time domain, that are splited (Hann window). Later, I do the FFT, then I get ...
• 17
157 views

### What is difference between frequency and pitch?in nutshell and simple words?

Although both are some how directly related Such that when one increases,the other one also increases I have read different Google results but couldn't understand . I want to know what is exact ...
• 968
197 views

### The Zero-Crossing rate threshold for a voiced/unvoiced decision

I've implemented a function that calculates the zero-crossing rate for a given signal. I've used this same function to calculate the pitch. To differentiate voiced signals from unvoiced with reference ...
168 views

### pitch detection: which is the most robust way to distinguish voiced from unvoiced audio

I am trying to write a voice/whistle driven synth but I am struggling with pitch detection. As a premise I must say I am quite skilled and experienced at dsp coding plus I have pretty read almost ...
• 301
1 vote
702 views

### Pitch detection using Cepstrum in matlab

What i am trying to do is to detect the pitch of a given sound signal, so for that purpose, i wanted to find cepstrum of a given signal. This is my code in MATLAB: ...
• 197
186 views

### Pitch Detection in the Browser

Does anybody know a good library that does pitch detection in the browser? Anything in Javascript or Webassembly would suffice. My target is mainly singing voices. I already tried pitchfinder, but for ...
55 views

### Implementation of CUSUM to segment stable parts in a pitch contour

I've got the pitch contour of a person singing several different frequencies after each other (octave errors cleaned up). I'd like to segment the stable parts from the transitionary ones (gliding up ...
664 views

### Problem using pitch shifting with TD-PSOLA and formant preservation

I tried out this implementation of TD-PSOLA (https://github.com/sannawag/TD-PSOLA) and even though I know how the algorithm works, I can't understand why I get NO audible differences in the output ...
1 vote
144 views

### How to find the Pitch of a utterance using narrowband spectrogram

Can anyone tell me how to find the pitch of an utterance from it's narrow band spectrogram? I am pretty new to the speech processing domain so any help is appreciated. P.S. I need methods to estimate ...
164 views

### How to compute key of a song?

I'm looking for a precise way to compute the key of a song. BPM would be cool too. Analog is ok. I tried to approach it from the DFT angle, but got stuck and can't really put a finger on what's the ...
494 views

### Understanding Pitch Detection with Autocorrelation Methods

I've been reading through A Smarter Way to Find Pitch, describing its pitch detection algorithm using autocorrelation. I've been having trouble understanding the accuracy claims. It says: MPM runs ...
1k views

### Resampling and removing high frequency noise?

I am currently working on a simple sampler that will allow me to load in a wav file and use my MIDI keyboard to play the loaded wav sample at the frequency according to the note played. Now I need ...
• 41
301 views

### How can I convert audio to a series of notes using pitch detection?

I have a good pitch detection system set up, and I would like to return a series of notes given an array of audio samples. My current approach is as follows: I have a moving window across the audio ...
858 views

### Pitch detection, YIN, pYIN

So here is the "seminal" YIN paper: Cheveigne A, Kawahara H. - YIN, a fundamental frequency estimator for speech and music and the new, improved probabilistic YIN: Mauch M, Dixon S. - ...
88 views

### Technique to detect pitch after analysing only one pitch period?

does anyone know if there is a technic to estimate the pitch of a given signal by analysing only one pitch period. I'm asking because I read about a program called AudioMotors. https://lesound.io/...
• 3
562 views

### Note detection in an audio file.

I am trying to find the given note in an audio file. It has been specifically told that each file contains only one note. So i directly took fft and found the corresponding frequency and then mapped ...
1 vote
975 views

### how to create a harmonic mask from fundamental frequency?

Using an algorithm that gives the fundamental frequency across time, example https://www.mathworks.com/help/audio/ref/pitch.html (or some other one?) how would I then use that, to create a harmonic ...
• 60
183 views

### Pitch Calculation Error via Autocorrelation Method

Aim : Pitch Calculation Issue : The calculated pitch does not match the expected one. For instance, the output is approx. 'D3', however the expected output is 'C5'. Source Sound : https://...
• 101
3k views

### YIN pitch estimation algoritm-simplified explanation [closed]

can someone please explain the steps of YIN pitch detection algorithm in a simple way "especially the last 3 steps". here is the research paper of YIN algorithm http://audition.ens.fr/adc/pdf/...
• 11
378 views

### Pitch detection algorithms "give up" after very little

I'm sorry if pitch detection has become a stale topic here, but I'm really interested if anyone has any advice on this topic. I'm looking for the best pitch detection algorithm for stringed ...
223 views

### Efficient calculation of exact frequency from a broad frequency range (1 Hz - 1000 Hz)

I have some input signal sampled at 1-10 MS/s. Let's assume that it contains one strong frequency component (with frequency anywhere in the range from 1 Hz to 1000 Hz or even higher, changing over ...
• 101
1 vote
2k views

### Change pitch of a wav file without changing the Sample rate?

I'm creating a Python library I call PAL, (Python Audio Library) and I need some help. What ways are there to change the pitch of a wav file without changing the sampling rate? I have complete access ...
• 13
359 views

### Where to begin? - Multi source polyphonic pitch detection

I'm quite interested in real time pitch tracking. I have used mcleod pitch method, Yin and other methods to perform real time pitch tracking for a monophonic audio track. I know that Polyphonic ...
468 views

### What are F0 counters in Speech signals? What is represented by F0?

I can't find any dedicated definition for Frequency F0 counters. Can anyone tell me what does F0 exactly mean, I am confused about that.
428 views

### How to prevent Octave Jumping in ACF of Speech Signal?

I'm working with speech signals and my aim is to estimate the fundamental frequency $\ F_0$ of this signal often called as "pitch". The main idea is taking small blocks of the speech signal such ...
• 149
118 views

### What should I do with FFT result array from microphone input? [duplicate]

I currently want to create a small pitch detector and I have to say that I am very new in this topic of signal processing. At the moment I implemented the FFt algorithm and I got an array of window ...