US 10,482,892 B2 · Very short pitch detection and coding

Abstract

System and method embodiments are provided for very short pitch detection and coding for speech or audio signals. The system and method include detecting whether there is a very short pitch lag in a speech or audio signal that is shorter than a conventional minimum pitch limitation using a combination of time domain and frequency domain pitch detection techniques. The pitch detection techniques include using pitch correlations in time domain and detecting a lack of low frequency energy in the speech or audio signal in frequency domain. The detected very short pitch lag is coded using a pitch range from a predetermined minimum very short pitch limitation that is smaller than the conventional minimum pitch limitation.

Claims34

Dependent claims

A method for pitch detection, implemented by an encoder, comprising:

determining a value of an initial pitch lag candidate of a current frame of a signal in a range from a second minimum pitch limitation to a first minimum pitch limitation using a time domain pitch detection technique, wherein the first minimum pitch limitation is a pitch limitation value defined in the Code Excited Linear Prediction Technique (CELP) algorithm, and the second minimum pitch limitation is a value smaller than the first minimum pitch limitation, and wherein the signal is a speech signal or an audio signal;
determining whether a lack of low frequency energy in the current frame is detected;
and
determining the initial pitch lag candidate is a final pitch lag when the lack of low frequency energy in the current frame is detected.

1 more element

An audio signal encoder, comprising:

a memory storing program instructions, and one or more processors coupled to the memory;
wherein the one or more processors, by executing the program instructions, are configured to:
determine a value of an initial pitch lag candidate of a current frame of a signal in a range from a second minimum pitch limitation to a first minimum pitch limitation using a time domain pitch detection technique, wherein the first minimum pitch limitation is a pitch limitation value defined in the Code Excited Linear Prediction Technique (CELP) algorithm, and the second minimum pitch limitation is a value smaller than the first minimum pitch limitation, and wherein the signal is a speech signal or an audio signal;
determine whether a lack of low frequency energy of in current frame is detected;
and
determine the initial pitch lag candidate is a final pitch lag when the lack of low frequency energy in the current frame is detected.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/662,302Filed 28 Jul 2017 · continuation

Priority

21 Dec 2011

Published

US 2017/0323652 A19 Nov 2017

Granted

19 Nov 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

G10L 21/003
Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its…:…
G10L 19/00
Speech or audio signals analysis-synthesis techniques for redundancy reduction
G10L 25/06
Characterised by the type of extracted parameters: the extracted parameters being correlation coefficients
G10L 25/21
Characterised by the type of extracted parameters: the extracted parameters being power information

Family

Application61/578,398Us provisional application · filed 21 Dec 2011

Application13/724,769Parent of this continuation · filed 21 Dec 2012

Application14/744,452Parent of this continuation · filed 19 Jun 2015

US 9,099,099 B2Parent of this continuation · filed 4 Aug 2015

US 2017/0323652 A1Pre-grant publication · published 9 Nov 2017

US 9,741,357 B2Parent of this continuation

US 2013/0166288 A1Published application

US 2015/0287420 A1Published application

US 10,482,892 B2This patent

From the US filing history. Foreign family members aren’t listed.

Very short pitch detection and coding

Life of this patent

Very short pitch detection and coding

Life of this patent

Abstract

Claims34