Noise suppressor
AssigneeNokia Corporation
InventorBeghdad Ayad
Life of this patent
Estimating the term…
Abstract
A method of suppressing noise in a signal containing speech and noise to provide a noise suppressed speech signal. An estimate is made of the noise and an estimate is made of speech together with some noise. The level of the noise included in the estimate of the speech together with some noise is variable so as to include a desired amount of noise in the noise-suppressed signal.
Claims15
A method for suppressing noise in an audio signal comprising a speech component and a noise component to provide a noise suppressed audio signal, the method comprising:
- causing an apparatus to make a frequency domain estimate of the noise component and a frequency domain estimate of the speech component together with a predetermined fraction of the noise component;
- using the estimates in the apparatus to generate a noise reducing filter having a frequency-dependent gain function to control a gain of the audio signal to suppress the noise component,
- wherein a first estimation of the frequency-dependent gain function is made adaptively in the apparatus and the first estimation is used to produce a noise estimation which is then used in the apparatus to produce a second estimation of the frequency-dependent gain function.
A noise suppressor for suppressing noise in an audio signal comprising a speech component and a noise component to provide a noise suppressed audio signal, the noise suppressor being configured to:
- make a frequency domain estimate of the noise component and a frequency domain estimate of the speech component together with a predetermined fraction of the noise component;
- use the estimates to generate a noise reducing filter having a frequency-dependent gain function to control a gain of the audio signal to suppress the noise component,
- wherein the apparatus is configured to make a first estimation of the frequency-dependent gain function adaptively and to use the first estimation to produce a noise estimation which is then used to produce a second estimation of the frequency-dependent gain function.
A communications terminal comprising a noise suppressor for suppressing noise in an audio signal comprising a speech component and a noise component to provide a noise suppressed audio signal, the noise suppressor being configured to:
- make a frequency-domain estimate of the noise component and a frequency-domain estimate of the speech component together with a predetermined fraction of the noise component;
- use the estimates to generate a noise reducing filter having a frequency-dependent gain function to control a gain of the audio signal to suppress the noise component,
- wherein the apparatus is configured to make a first estimation of the frequency-dependent gain function adaptively and to use the first estimation to produce a noise estimation which is then used to produce a second estimation of the frequency-dependent gain function.
A communications network comprising a noise suppressor for suppressing noise in an audio signal comprising a speech component and a noise component to provide a noise suppressed audio signal, the noise suppressor being configured to:
- make a frequency-domain estimate of the noise component and a frequency-domain estimate of the speech component together with a predetermined fraction of the noise component;
- use the estimates to generate a noise reducing filter having a frequency-dependent gain function to control a gain of the audio signal to suppress the noise component,
- wherein the apparatus is configured to make a first estimation of the frequency-dependent gain function adaptively and to use the first estimation to produce a noise estimation which is then used to produce a second estimation of the frequency-dependent gain function.
A noise suppressor for suppressing noise in an audio signal comprising a speech component and a noise component to provide a noise suppressed audio signal, the noise suppressor comprising:
- means for making a frequency-domain estimate of the noise component;
- means for making a frequency-domain estimate of the speech component together with a predetermined fraction of the noise component;
- means for using the estimates to generate a noise reducing filter having a frequency-dependent gain function to control a gain of the audio signal to suppress the noise component,
- wherein the apparatus is configured to make a first estimation of the frequency-dependent gain function adaptively and to use the first estimation to produce a noise estimation which is then used to produce a second estimation of the frequency-dependent gain function.
Dependencies are inferred from the claim text.