DE69913724T2

5G,4G,3G,2G

Title

Not Available

Application Number:

DE1999613724T

Publication Date:

07-10-2004

Current Assignee:

VOICEAGE CORPORATION

Family ID:

4162966

Application Date:

27-10-1999

Declaring Company:

Publication Country:

US

Priority Date:

27-10-1998

View on Espacenet goto-link

Title

Not Available

Application Number:

DE1999613724T

Family ID:

4162966

Publication Country:

US

Publication Date:

07-10-2004

Application Date:

27-10-1999

Priority Date:

27-10-1998

Current Assignee:

VOICEAGE CORPORATION

Declaring Company:

View on Espacenet goto-link

Abstract  Abstract

A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal comprises a signal preemphasis filter a synthesis filter claculator and a perceptual weighting filter. The signal preemphasis filter enhances high frequency content of the wideband signal to thereby produce a preemphasised signal. The signal preemphasis filter has a transfer function of the form: P(z)=1 - mu z<-1> wherein mu is a preemphasis factor having a value located between 0 and 1. The synthesis filter calculator is responsive to the preemphasised signal for producing synthesis filter coefficients. Finally the perceptual weighting filter processes the preemphasised signal in relation to the synthesis filter coefficients to produce the perceptually weighted signal. The perceptual weighting filter has a transfer function with fixed denominator of the form: W(z) A (z/ gamma 1) / (1- gamma 2z<-1>) where 0< gamma 2< gamma 1 </=1 and gamma 2 and gamma 1 are weighting control values whereby weighting of the wideband signal in a format region is substantially decoupled from a spectral tilt of this wideband signal.

A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal comprises a signal preemphasis filter a synthesis filter claculator and a perceptual weighting filter. The signal preemphasis filter enhances high frequency content of the wideband signal to thereby produce a preemphasised signal. The signal preemphasis filter has a transfer function of the form: P(z)=1-?z-1 wherein ? is a preemphasis factor having a value located between 0 and 1. The synthesis filter calculator is responsive to the preemphasised signal for producing synthesis filter coefficients. Finally the perceptual weighting filter processes the preemphasised signal in relation to the synthesis filter coefficients to produce the perceptually weighted signal. The perceptual weighting filter has a transfer function with fixed denominator of the form: W(z) A (z/?1) / (1-?2z-1) where 0<?2<?1 ?1 and ?2 and ?1 are weighting control values whereby weighting of the wideband signal in a format region is substantially decoupled from a spectral tilt of this wideband signal.

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