Loading patent…
AssigneeTelecom Italia S.p.A.
InventorsGianmario Bollano, Donato Ettorre, Rodrigo Pousas Navarro
Estimating the term…
A filter such as a Wiener filter for noise reduction in a signal, such as a speech signal, affected by background noise includes a circuit for determining values of an update function relating new value of estimated noise power to a previous value of estimated noise power, the update function being a function of said previous estimated noise power and a mean input power spectral density. The circuit includes a look-up table having values for the update function stored therein with the previous value of estimated noise power and the mean input power spectral density as a first and a second search entry, respectively. These search entries are entered via an input module and exploited by search circuitry associated with the look-up table for selectively searching values for the update function in the look-up table. The search is preferably carried out on the basis of an index computed starting from said first and second search entries.
A method of determining, in a noise reduction process applied to a signal affected by background noise, an update function relating a new value of estimated noise power (Pnoise—New) with a previous value of estimated noise power (Pnoise), said update function being a function of said previous estimated noise power (Pnoise) and a mean input power spectral density (Pin—PSD), comprising the steps of:
A circuit for determining, in a filter for noise reduction in a signal affected by background noise, an update function relating a new value of estimated noise power (Pnoise—New) with a previous value of estimated noise power (Pnoise), said update function being a function of said previous estimated noise power (Pnoise) and a mean input power spectral density (Pin—PSD), comprising:
Dependencies are inferred from the claim text.