US 2010/0169085 A1 · MODEL BASED REAL TIME PITCH TRACKING SYSTEM AND SINGER EVALUATION METHOD

Abstract

The various embodiments herein provide a system and method to track the pitch of a human being in real time using time varying model. According to one embodiment, the input voice is synthesised to obtain a lower order model. The lower model is down sampled and fitted to a time varying 2nd order model. The down sampled signal is passed through a pitch tracking filter, a fading filter and a gradient filter to obtain a pitch signal in real time. The noise included in the pitch signal is removed by passing the acquired pitch signal through a Kalman filter to obtain a smoothened pitch signal in real time.

Claims21

Dependent claims

A model based real time pitch tracking system comprising:

a low pass filter;
a down sampler connected to the low pass filter;
a second order band pass filter connected to the down sampler;
a gradient filter connected to the second order band pass filter;
a fading filter connected to the second order band pass filter;
an integrator connected to the fading filter and to the gradient filter;
a first order filter connected to the integrator;
a pitch frequency estimator connected to the first order filter;
and
a smoothing filter connected to the pitch frequency estimator;
wherein a lower order model is separated from a voice time series to perform a pitch tracking process in real time.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/647,449Filed 26 Dec 2009

Priority

IN 2970/CHE/200827 Dec 2008

Published

1 Jul 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

G10L 25/90
Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00: pitch determination of speech signals
G10H 1/361
Accompaniment arrangements: recording/reproducing of accompaniment for use with an external source, e.g. karaoke systems
G10H 2210/066
Musical analysis, i.e. isolation, extraction or identification of musical elements or musical parameters from a raw acoustic signal or from an…:…
G10H 2210/091
Musical analysis, i.e. isolation, extraction or identification of musical elements or musical parameters from a raw acoustic signal or from an…:…

Model based real time pitch tracking system and singer evaluation method

Life of this patent

Model based real time pitch tracking system and singer evaluation method

Life of this patent

Abstract

Claims21