Noise suppression using integrated frequency-domain signals

A noise suppressing apparatus for suppressing noise contained in an input signal including a speech or audio signal, comprising:

• a transformer for transforming the input signal into frequency-domain signals with a first frequency resolution;
• a band integrator for integrating the frequency-domain signals to determine subband signals with a second frequency resolution that is smaller than the first frequency resolution, wherein each subband signal comprises a plurality of frequency-domain signals;
• a noise estimator for determining estimated noise with the second frequency resolution based on the subband signals;
• a spectral gain generator for determining a single spectral gain for each subband signal based on the estimated noise and the respective subband signal;
• and
• a multiplier for weighting said frequency-domain signals by using said spectral gains wherein the single spectral gain is commonly used for all the plurality of frequency-domain signals of the same subband signal.

A non-transitory computer readable storage device embodying a computer program for performing signal processing to suppress noise contained in an input signal including a speech or audio signal, which when executed by a computer causes a computer to execute:

• a process for transforming the input signal into frequency-domain signals with a first frequency resolution;
• a process for integrating the frequency-domain signals to determine subband signals with a second frequency resolution that is smaller than the first frequency resolution, wherein each subband signal comprises a plurality of frequency-domain signals;
• a process for determining estimated noise with the second frequency resolution based on the subband signals;
• a process for determining a single spectral gain for each subband signal based on the estimated noise;
• and
• a process for weighting said frequency-domain signals by said spectral gains wherein the single spectral gain is commonly used for all the plurality of frequency-domain signals of the same subband signal.

A noise suppressing method, comprising:

• transforming an input signal into frequency-domain signals with a first frequency resolution, frequency-domain signals comprising a plurality of frequency components, the input signal including a speech or audio signal;
• determining spectral gains with based on said frequency-domain signals, wherein the number of said spectral gains is less than the number of frequency components in said frequency-domain signals;
• and
• weighting said frequency-domain signals by the spectral gains to suppress noise contained in the input signal, wherein at least one of the spectral gains is employed for a plurality of said frequency components.

A noise suppressing apparatus for suppressing noise, comprising:

• a transformer for transforming an input signal into frequency-domain signals with a first frequency resolution, the input signal including a speech or audio signal;
• a band integrator for integrating said frequency-domain signals to determine subband signals with a second frequency resolution that is smaller than the first frequency resolution;
• a spectral gain generator for determining a single spectral gain for each subband signal based on the respective subband signal;
• and
• a multiplier for weighting said frequency-domain signals by the spectral gains;
• wherein said multiplier employs at least one of said spectral gains for a plurality of said frequency-domain signals.

A non-transitory computer readable storage device embodying a computer program for performing a signal process in which, to suppress noise contained in an input signal including a speech or audio signal, the input signal is transformed into frequency-domain signals with a first frequency resolution and comprising a plurality of frequency components, spectral gains are determined based on subband signals, and said frequency-domain signals are weighted by the spectral gains, said computer program which when executed by a computer causes a computer to execute:

• a process for integrating said frequency-domain signals to determine subband signals with a second frequency resolution that is smaller than the first frequency resolution;
• a process for determining, for each single subband signal, a single spectral gain based on the respective subband signal;
• and
• a process for employing at least one of the spectral gains to weight a plurality of said frequency-domain signals.