Patent application number | Description | Published |
20090010452 | ADAPTIVE NOISE GATE AND METHOD - Speech noise gating for gain control functions such as automatic gain control, dynamic range compression, and digital volume control scales the gain control function gain according to the ratio of noise energy to input energy. | 01-08-2009 |
20090012786 | Adaptive Noise Cancellation - Speech-free noise estimation by cancellation of speech content from an audio input where the speech content is estimated by noise suppression. Adaptive noise cancellation with primary and noise-reference inputs and an adaptive noise cancellation filter from estimating primary noise from noise-reference input. Speech Suppressor (Noise Estimation) applied to noise-reference input provides speech-free noise estimates for noise cancellation in the primary input. | 01-08-2009 |
20090036170 | VOICE ACTIVITY DETECTOR AND METHOD - Acoustic echo control for hands-free phone has acoustic echo cancellation and echo suppression with a voice activity detection for the echo suppression based on near-end input power together with an estimate for acoustic echo cancellation gain. | 02-05-2009 |
20110123019 | METHOD AND APPARATUS FOR CROSS-TALK RESISTANT ADAPTIVE NOISE CANCELLER - A method and apparatus for cross-talk resistant adaptive noise cancellation. The method includes retrieving, via the processor, a primary signal and a reference signal, filtering the primary signal utilizing a filter H | 05-26-2011 |
20110125497 | Method and System for Voice Activity Detection - A method of voice activity detection is provided that includes measuring a first signal level in a first sample of a first audio signal from a first audio capture device and a second signal level in a second sample of a second audio signal from a second audio capture device, and detecting voice activity based on the first signal level, the second signal level, and an activity threshold. | 05-26-2011 |
20130013304 | Method and Apparatus for Environmental Noise Compensation - A method of environmental noise compensation a speech audio signal is provided that includes estimating a fast audio energy level and a slow audio energy level in an audio environment, wherein the speech audio signal is not part of the audio environment, and applying a gain to the speech audio signal to generate an environment compensated speech audio signal, wherein the gain is updated based on the estimated slow audio energy level when the estimated fast audio energy level is not indicative of an audio event in the audio environment and the estimated gain is not updated when the estimated fast audio energy level is indicative an audio event in the audio environment. | 01-10-2013 |
20130046535 | Method, System and Computer Program Product for Suppressing Noise Using Multiple Signals - In response to a first envelope within a kth frequency band of a first channel, a speech level within the kth frequency band of the first channel is estimated. In response to a second envelope within the kth frequency band of a second channel, a noise level within the kth frequency band of the second channel is estimated. A noise suppression gain for a time frame n is computed in response to the estimated speech level for a preceding time frame, the estimated noise level for the preceding time frame, the estimated speech level for the time frame n, and the estimated noise level for the time frame n. An output channel is generated in response to multiplying the noise suppression gain for the time frame n and the first channel. | 02-21-2013 |
20130054232 | Method, System and Computer Program Product for Attenuating Noise in Multiple Time Frames - At least one signal is received that represents speech and noise. In response to the at least one signal, frequency bands are generated of an output channel that represents the speech while attenuating at least some of the noise from the at least one signal. Within a kth frequency band of the at least one signal: a first ratio is determined of a clean version of the speech for a preceding time frame to the noise for the preceding time frame; and a second ratio is determined of a noisy version of the speech for the time frame n to the noise for the time frame n. In response to the first and second ratios, a gain is determined for the kth frequency band of the output channel for the time frame n. | 02-28-2013 |
20130054233 | Method, System and Computer Program Product for Attenuating Noise Using Multiple Channels - A first signal is received that represents speech and the noise. The noise includes directional noise and diffused noise. A second signal is received that represents the noise and leakage of the speech. In response to the first and second signals: a first channel is generated that represents the speech and the diffused noise while attenuating most of the directional noise from the first signal; and a second channel is generated that represents the noise while attenuating most of the speech from the second signal. In response to the first and second channels, an output channel is generated that represents the speech while attenuating most of the noise from the first channel. | 02-28-2013 |