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-?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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5G,4G,3G,2G | 06/01/2010 | ISLD-201001-018 | VOICEAGE CORPORATION | No | Family Member |
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