Method for generating a final signal from a near-end signal and a far-end signal
OwnerBrent W. Edwards, Sunil Puriainventors
Life of this patent
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Abstract
A method of processing a far-end signal and a near-end signal to produce a final signal, the far-end signal containing speech, the near-end signal containing speech and background noise. The method includes: determining an amplification gain based upon the near-end signal; removing a portion of the background noise from the near-end signal to create a noise-reduced near-end signal; combining the far-end signal with the noise-reduced near-end signal to create a combined signal; and amplifying the combined signal by the amplification gain to create the final signal.
Claims46
A method of processing a far-end signal and a near-end signal to produce a final signal, the far-end signal containing speech, the near-end signal containing speech and background noise, the method comprising:
- a) determining an amplification gain based upon the near-end signal;
- b) removing a portion of the background noise from the near-end signal to create a noise-reduced near-end signal;
- c) combining the far-end signal with the noise-reduced near-end signal to create a combined signal;
- and
- d) amplifying the combined signal by the amplification gain to create the final signal.
A method of processing a far-end signal and a near-end signal to produce a final signal, the far-end signal containing speech, the near-end signal containing speech and background noise, the method comprising:
- a) separating the near-end signal into a first near-end subband signal and a second near-end subband signal;
- b) determining a first amplification gain based upon the first near-end subband signal;
- c) determining a second amplification gain based upon the second near-end subband signal;
- d) removing a portion of the background noise from the near-end signal to create a noise-reduced near-end signal;
- e) combining the far-end signal with the noise-reduced near-end signal to create a combined signal;
- f) separating the combined signal into a first combined subband signal and a second combined subband signal;
- g) amplifying the first combined subband signal by the first amplification gain to create a first amplified subband signal;
- h) amplifying the second combined subband signal by the second amplification gain to create a second amplified subband signal;
- and
- i) combining the first combined subband signal and the second combined subband signal to create the final signal.
A method of processing a far-end signal and a near-end signal to produce a final signal, the far-end signal containing speech, the near-end signal containing speech and background noise, the method comprising:
- a) separating the near-end signal into a first near-end subband signal and a second near-end subband signal;
- b) determining the masking level of noise of the first near-end subband signal;
- c) determining the masking level of noise of the second near-end subband signal;
- d) estimating the masking level of noise of a third near-end subband signal based upon the masking level of noise of the first near-end subband signal and the masking level of noise of the second near-end subband signal;
- e) determining a first amplification gain based upon the masking level of noise of the first near-end subband signal;
- f) determining a second amplification gain based upon the masking level of noise of the second near-end subband signal;
- g) determining a third amplification gain based upon the masking level of noise of the third near-end subband signal;
- h) removing a portion of the background noise from the near-end signal to create a noise-reduced near-end signal;
- i) combining the far-end signal with the noise-reduced near-end signal to create a combined signal;
- j) separating the combined signal into a first combined subband signal, a second combined subband signal, and a third combined subband signal;
- k) amplifying the first combined subband signal by the first amplification gain to create a first amplified subband signal;
- l) amplifying the second combined subband signal by the first amplification gain to create a second amplified subband signal;
- m) amplifying the third combined subband signal by the first amplification gain to create a third amplified subband signal;
- and
- n) combining the first combined subband signal, the second combined subband signal, and the third combined subband signal to create the final signal.
A communication device comprising:
- a) a transmitter/receiver adapted for a communication medium;
- b) control circuitry coupled to the transmitter/receiver that controls transmission, reception and control of audio signals;
- c) a speaker coupled to the control circuitry that renders audio signals audible;
- and
- d) a microphone coupled to the control circuitry that transforms sounds into a sidetone signal;
- wherein said control circuitry includes:
- a noise filter that receives the sidetone signal and produces a noise-reduced sidetone signal;
- and
- an amplifier that combines an audio signal received from the transmitter/receiver with the noise-reduced sidetone signal to produce a combined signal, amplifies the combined signal according to a function responsive to the background noise in the sidetone, and provides an enhanced audio signal to the speaker.
Dependencies are inferred from the claim text.