Abstract
The present invention relates to a method and device for enhancing periodicity of an excitation signal produced in relation to a pitch codevector and an innovative codevector for supplying a signal synthesis filter in view of producing a synthesized wideband signal. In this periodicity enhancing device and method, a factor generator is responsive to the adaptive and innovative codevectors for calculating a periodicity factor. An innovation filter subsequently processes the innovative codevector in relation to this periodicity factor to reduce energy of a low frequency portion of the innovative codevector and enhance periodicity of a low frequency portion of the excitation signal. As an example, the innovation filter has a transfer function of the form: F(z)=- alpha (z)+1- alpha (z)<-1> where alpha is a periodicity factor, and the factor generator calculates the periodicity factor alpha using the relation: alpha = qR?p? bounded by alpha < q where q is an enhancement factor set for example to 0.25, and where R?p? is represented by formula (I) where v?T? is the pitch codevector, b is a pitch gain, N is a subframe length, and u is the excitation signal.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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5G,4G,3G,2G | 06/01/2010 | ISLD-201001-018 | VOICEAGE CORPORATION |
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