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.

Description

[0001] This application claims prior application priority to U.S. Nonprovisional Patent Application No. 13 / 724,769, filed December 21, 2012, entitled "Very Short Pitch Detection," which prior Application Claims Priority Priority to U.S. Provisional Patent Application No. 61 / 578,398, Filed December 21, 2011, entitled "Very Short Pitch Detection" The content of is incorporated into this text by way of introduction. technical field [0002] The present invention relates generally to the field of signal encoding, and in particular embodiments, to a system and method for very short pitch detection and encoding. Background technique [0003] Traditionally, parametric speech coding methods use the redundancy in the speech signal to reduce the amount of information to be sent, and estimate the parameters of each speech sample in a short period of time. This redundancy is caused by the periodic repetition of the speech waveform and the slow change of the spectral envelope of the spe...

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Problems solved by technology

As for unvoiced speech, the signal is more like a random noise and less predictable

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