| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381710140 | Tonal noise or particular frequency or band | 6 |
| 20090123003 | AMBIENT NOISE-REDUCTION SYSTEM - A signal processing circuit is intended for use in a noise reduction system, which produces a target filter characteristic that would achieve optimal noise cancellation, the target filter characteristic including a resonant peak at a first frequency. The signal processing circuit comprises an analogue filter, which has an amplitude response that has a peak or trough at a centre frequency, and has a phase response that switches polarity at the centre frequency and tends to zero with increase or reduction in frequency away from the centre frequency. The centre frequency in the amplitude response is substantially equal to the first frequency. The analogue filter may be in the form of a series inductive-capacitive-resistive circuit, where the inductive component is in the form of a gyrator. | 05-14-2009 |
| 20130322643 | Multi-Microphone Robust Noise Suppression - A robust noise reduction system may concurrently reduce noise and echo components in an acoustic signal while limiting the level of speech distortion. The system may receive acoustic signals from two or more microphones in a close-talk, hand-held or other configuration. The received acoustic signals are transformed to frequency domain sub-band signals and echo and noise components may be subtracted from the sub-band signals. Features in the acoustic sub-band signals are identified and used to generate a multiplicative mask. The multiplicative mask is applied to the noise subtracted sub-band signals and the sub-band signals are reconstructed in the time domain. | 12-05-2013 |
| 20130343558 | METHOD FOR DENOISING AN ACOUSTIC SIGNAL FOR A MULTI-MICROPHONE AUDIO DEVICE OPERATING IN A NOISY ENVIRONMENT - This method comprises steps of: a) partitioning ( | 12-26-2013 |
| 20140241539 | NOISE REMOVAL SYSTEM - A system for noise removal is coupled to a signal unit that provides a digital signal. The noise removal system includes a transformation module to transform the digital signal into an f-digital signal, a threshold filter to generate a noiseless signal from the f-digital signal based on a threshold profile, and a signal synthesizer to provide a gain to the noiseless signal and to transform the noiseless signal into an output signal. | 08-28-2014 |
| 20140355777 | ELECTRONIC DEVICE - Provided is an electronic device that is capable of reducing sound leakage from a vibration plate vibrated by a piezoelectric element. An electronic device | 12-04-2014 |
| 20160029124 | SYSTEM AND METHOD FOR MITIGATING AUDIO FEEDBACK - A system and method for mitigating audio feedback may calculate a smoothed frequency spectrum of an audio signal. Previously detected candidate feedback tones may be obtained. Candidate feedback tones may be determined responsive to a frequency spectrum of the audio signal, the smoothed frequency spectrum and the previously detected candidate feedback tones. One or more signal characteristics associated with the audio signal and feedback coefficients associated with the candidate feedback tones may be obtained. The feedback coefficients may be modified responsive to the one or more signal characteristics. Actionable feedback tones may be determined responsive to the associated feedback coefficients exceeding a respective feedback threshold. Feedback suppression coefficients associated with each of the determined actionable feedback tones may be generated and may be utilized to suppress the actionable feedback tones. | 01-28-2016 |
