CA2347667C

5G,4G,3G,2G

Title

Periodicity enhancement in decoding wideband signals

Application Number:

CA19992347667

Publication Date:

14-02-2006

Current Assignee:

Family ID:

Application Date:

27-10-1999

Declaring Company:

Publication Country:

US

Priority Date:

27-10-1998

Title

Periodicity enhancement in decoding wideband signals

Application Number:

CA19992347667

Family ID:

Publication Country:

US

Publication Date:

14-02-2006

Application Date:

27-10-1999

Priority Date:

27-10-1998

Current Assignee:

Declaring Company:

Abstract  Abstract

The present invention relates to a method and device for enhancing periodicity of an excitation signal produced in relation to a pitchcodevector and an innovative codevector for supplying a signal synthesis filter in view of producing a synthesized wideband signal. Inthis periodicity enhancing device and method a factor generator is responsive to the adaptive and innovative codevectors for calculatinga periodicity factor. An innovation filter subsequently processes the innovative codevector in relation to this periodicity factor to reduceenergy 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 thefactor 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~ is the pitch codevector b is a pitch gain N is a subframe length and u is the excitation signal.

Note:

The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)

The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.

Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

Family member:related patents or applications that share a common priority or original filing.