Processing audio signals
AssigneeSkype
InventorsKarsten Vandborg Sorensen, Jesus de Vicente Peña
Life of this patent
Estimating the term…
Abstract
According to an embodiment, a method of reducing noise in a signal received at a processing stage of an acoustic system includes, at the processing stage identifying at least one frequency which causes a system gain of the acoustic system to be above an average system gain of the acoustic system; providing a noise attenuation factor for reducing noise in the signal for the at least one frequency, the noise attenuation factor for the at least one frequency based on the system gain for that frequency; and applying the noise attenuation factor to a component of the signal at that frequency.
Claims16
A method of reducing noise in a signal received at a processing stage of an acoustic system, the method comprising, at the processing stage:
- identifying at least one frequency at which a system gain of the acoustic system is above an average system gain of the acoustic system;
- providing a noise attenuation factor for reducing noise in the signal for the at least one frequency, the noise attenuation factor for the at least one frequency based on the system gain for that frequency;
- and
- applying the noise attenuation factor to a component of the signal at that frequency, wherein the noise attenuation factor is lower limited by a variable minimum gain value, the variable minimum gain value being generated based on the system gain at that frequency.
An acoustic system comprising:
- an audio input arranged to receive a signal;
- a signal processing stage connected to receive the signal from the audio input;
- the signal processing stage configured to identify at least one frequency which causes a system gain of the acoustic system to be above an average system gain of the acoustic system;
- the signal processing stage configured to provide a noise attenuation factor for reducing noise in the signal for the at least one frequency, the noise attenuation factor for the at least one frequency based on the system gain for that frequency;
- and
- the signal processing stage configured to apply the noise attenuation factor to a component of the signal at that frequency.
A user device comprising:
- an audio input for receiving an audio signal from a user;
- a signal processing stage for processing the signal;
- a transmitter configured to transmit the processed signal wirelessly from the user device to a remote device;
- and
- the signal processing stage configured to identify at least one frequency which causes a system gain of the acoustic system to be above an average system gain of the acoustic system, the signal processing stage being configured to provide a noise attenuation factor for reducing noise in the signal for the at least one frequency, the noise attenuation factor for the at least one frequency based on the system gain for that frequency, and the signal processing stage being configured to apply the noise attenuation factor to a component of the signal at that frequency.
A signal processing stage for processing an audio signal, the signal processing stage comprising:
- means for identifying at least one frequency which causes a system gain of an acoustic system to be above an average system gain of the acoustic system;
- means for providing a noise attenuation factor for reducing noise in the signal for the at least one frequency, the noise attenuation factor for the at least one frequency based on the system gain for that frequency;
- and
- means for applying the noise attenuation factor to a component of the signal at that frequency, wherein the noise attenuation factor is lower limited by a variable minimum gain value, the variable minimum gain value being generated based on the system gain at that frequency.
Dependencies are inferred from the claim text.