EP1125285B1

5G,4G,3G,2G

Title

Periodicity enhancement in decoding wideband signals

Application Number:

EP19990952200

Publication Date:

30-07-2003

Current Assignee:

SAINT LAWRENCE COMMUNICATIONS LLC

Family ID:

4162966

Application Date:

27-10-1999

Declaring Company:

VOICEAGE CORPORATION

Publication Country:

US

Priority Date:

27-10-1998

View on Espacenet goto-link

Title

Periodicity enhancement in decoding wideband signals

Application Number:

EP19990952200

Family ID:

4162966

Publication Country:

US

Publication Date:

30-07-2003

Application Date:

27-10-1999

Priority Date:

27-10-1998

Current Assignee:

SAINT LAWRENCE COMMUNICATIONS LLC

Declaring Company:

VOICEAGE CORPORATION

View on Espacenet goto-link

Abstract  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.

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)=-?(z)+1-?(z)-1 where ? is a periodicity factor and the factor generator calculates the periodicity factor ? using the relation: ? = qRp bounded by ? <q where q is an enhancement factor set for example to 0.25 and where Rp is represented by formula (I) where vT is the pitch codevector b is a pitch gain N is a subframe length and u is the excitation signal.

Note:

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