Abstract: A computer-implemented method to detect and reduce feedback in an audio signal is disclosed. The method may include obtaining an audio signal. The method may further include separating the audio signal into a plurality of frequency bands. The method may also include, for each frequency band of the plurality of frequency bands, determining whether the frequency band includes feedback. The method may further include, for each frequency band determined to include feedback, attenuating the frequency band. The method may also include combining each frequency band of the plurality of frequency bands to produce an output audio signal.

Abstract: A computer-implemented method to reduce noise in an audio signal is disclosed. The method may include obtaining an audio signal and separating the audio signal into frequency components in each of multiple frequency bands. The method may include obtaining a first magnitude threshold for a first frequency band of the plurality of frequency bands. The method may include calculating a first envelope of first frequency components in the first frequency band during a first time frame and a second envelope of the first frequency components during a second time frame after the first time frame. The method may include, in response to a difference between the first envelope and the second envelope of the first frequency band being less than the first magnitude threshold, attenuating the first frequency components. The method may include combining the frequency components, including the attenuated first frequency components, to produce an output audio signal.

Abstract: According to one or more aspects of the present disclosure, operations may include activating testing software of a digital signal processing system instead of activating operating software of the digital signal processing system. The testing software may be configured to, while activated, perform linear operations with respect to signals that traverse the signal path. The operating software may be configured to, while activated, perform non-linear operations with respect to signals that traverse the signal path. The testing software may be activated during testing of one or more hardware elements of the signal path that are configured to perform analog operations on signals that traverse the signal path.

Abstract: According to one or more aspects of the present disclosure, operations may include obtaining multiple microphone signals derived from a microphone array that includes a multiple omnidirectional microphones. Each of the microphone signals may be derived from a different microphone of the microphone array. The operations may further include determining whether the microphone signals include noise, such as wind noise, based on two or more of the plurality of microphone signals. In addition, the operations may include generating an output signal based on a beamformed signal or a reduced-noise signal based on whether the microphone signals are determined to include noise.

Abstract: According to one or more aspects of the present disclosure, operations may include activating testing software of a digital signal processing system instead of activating operating software of the digital signal processing system. The testing software may be configured to, while activated, perform linear operations with respect to signals that traverse the signal path. The operating software may be configured to, while activated, perform non-linear operations with respect to signals that traverse the signal path. The testing software may be activated during testing of one or more hardware elements of the signal path that are configured to perform analog operations on signals that traverse the signal path.

Abstract: A computer-implemented method to reduce noise in an audio signal is disclosed. The method may include obtaining an audio signal and separating the audio signal into frequency components in each of multiple frequency bands. The method may include obtaining a first magnitude threshold for a first frequency band of the plurality of frequency bands. The method may include calculating a first envelope of first frequency components in the first frequency band during a first time frame and a second envelope of the first frequency components during a second time frame after the first time frame. The method may include, in response to a difference between the first envelope and the second envelope of the first frequency band being less than the first magnitude threshold, attenuating the first frequency components. The method may include combining the frequency components, including the attenuated first frequency components, to produce an output audio signal.

Abstract: A computer-implemented method to detect and reduce feedback in an audio signal is disclosed. The method may include obtaining an audio signal. The method may further include separating the audio signal into a plurality of frequency bands. The method may also include, for each frequency band of the plurality of frequency bands, determining whether the frequency band includes feedback. The method may further include, for each frequency band determined to include feedback, attenuating the frequency band. The method may also include combining each frequency band of the plurality of frequency bands to produce an output audio signal.