Single-channel, binaural and multi-channel dereverberation
A method is presented for estimating and suppressing reverberation from a digital reverberant signal. A method for changing a first reverberation estimation according to another reverberation estimation is further provided. A method for controlling the reverberation suppression rate is also presented.
1. A method, in a multimedia signal processing system, that allows a user to adjust suppression of distortion or interference from a digital signal that represents a sound signal, comprising:
analyzing the digital signal by determining a plurality of time-frequency frames of the digital signal;
deriving an estimation of distortion or interference from one of the frames in a first time instant;
deriving a suppression gain from the estimation;
providing, by the user, an exponent via a software or hardware interface connected to the processing system;
deriving a modified suppression gain based on the suppression gain raised to a power related to the exponent;
outputting a signal that involves processing the frame in the first time instant utilizing the modified suppression gain;
and outputting a signal that involves processing the frame in a second time instant utilizing the modified suppression gain.
2. The method of claim 1 , where the multimedia signal processing system is realized in a computer.
3. The method of claim 1 , where the multimedia signal processing system implements a multimedia software system.
4. The method of claim 1 , wherein the digital signal is single channel or multi-channel or stereo or binaural.
5. The method of claim 1 , wherein the sound signal is part of a multimedia signal.
6. The method of claim 1 , wherein the time-frequency frames are determined using a short-time Fourier transform (STFT) or a wavelet transform or a polyphase filterbank or a multi rate filterbank or a quadrature mirror filterbank or a warped filterbank or an auditory-inspired filterbank.
7. A system to allow a user to adjust suppression of reverberation or noise from a digital signal that represents a sound signal, comprising:
a multimedia signal processing system that is capable of processing a digital signal related to the sound signal and adapted to:
analyze the digital signal by determining a plurality of time-frequency frames of the digital signal;
derive an estimation of distortion or interference from one of the frames in a first time instant;
derive a suppression gain from the estimation;
provide, by the user, an exponent via a software or hardware interface connected to the processing system;
derive a modified suppression gain based on the suppression gain raised to a power related to the exponent;
output a signal that involves processing the frame in the first time instant utilizing the modified suppression gain;
and output a signal that involves processing the frame in a second time instant utilizing the modified suppression gain.
8. The system of claim 7 , where the multimedia signal processing system is realized in a computer.
9. The system of claim 7 , where the multimedia signal processing system implements a multimedia software system.
10. The system of claim 7 , wherein the digital signal is single channel or multi-channel or stereo or binaural.
11. The system of claim 7 , wherein the sound signal is part of a multimedia signal.
12. The system of claim 7 , wherein the time-frequency frames are determined using a short-time Fourier transform (STFT) or a wavelet transform or a polyphase filterbank or a multi rate filterbank or a quadrature mirror filterbank or a warped filterbank or an auditory-inspired filterbank.
13. A non-transitory information storage media having stored thereon instructions, what when executed by one or more processors in a multimedia signal processing system, cause to be performed a method that allows a user to adjust suppression of reverberation or noise from a digital signal that represents a sound signal, comprising:
analyzing the digital signal by determining a plurality of time-frequency frames of the digital signal;
deriving an estimation of distortion or interference from one of the frames in a first time instant;
deriving a suppression gain from the estimation;
providing, by the user, an exponent via a software or hardware interface connected to the processing system;
deriving a modified suppression gain based on the suppression gain raised to a power related to the exponent;
outputting a signal that involves processing the frame in the first time instant utilizing the modified suppression gain;
and outputting a signal that involves processing the frame in a second time instant utilizing the modified suppression gain.
14. The media of claim 13 , where the multimedia signal processing system is realized in a computer.
15. The media of claim 13 , where the multimedia signal processing system implements a multimedia software system.
16. The media of claim 13 , wherein the digital signal is single channel or multi-channel or stereo or binaural.
17. The media of claim 13 , wherein the time-frequency frames are determined using a short-time Fourier transform (STFT) or a wavelet transform or a polyphase filterbank or a multi rate filterbank or a quadrature mirror filterbank or a warped filterbank or an auditory-inspired filterbank.
18. The media of claim 13 , wherein the sound signal is part of a multimedia signal.