5 results about "Adaptive feedback cancellation" patented technology

The invention provides a hearing-aid power-on no-howling processing method and device and a hearing-aid, and the method comprises the steps: employing an active gain management strategy when the hearing-aid is powered on, and setting the gain to be in an initial low-gain state lower than a preset howling threshold value; estimating and counteracting acoustic feedback in real time based on a self-adaptive feedback elimination processing rule in a gain recovery process and a whole time period of a working operation mode after the hearing aid is started; and meanwhile, monitoring howling characteristics in the full-band signal in real time based on a howling suppression processing rule, and performing gain suppression on a corresponding specific frequency band when the howling characteristics are monitored. Through the method and the device, howling can be actively prevented when the hearing aid is started, acoustic feedback can be quickly, stably and efficiently inhibited in a working mode, meanwhile, high-adaptability processing on a complex acoustic environment is ensured, and higher stability and better tone quality are provided for the hearing aid in the whole service cycle.

The present application relates to the technical field of audio data processing, and relates to an audio data processing method for a personal sound amplification product, and a personal sound amplification product. The method comprises: an adaptive feedback canceller eliminates acoustic feedback in an audio signal; an adaptive notch filter suppresses a howling signal in the audio signal; a transform module converts an audio signal acquired by a microphone into a time-frequency signal; a multi-subband dynamic range compressor performs dynamic range adjustment on the time-frequency signal to obtain gains of frequency points; a filter conversion module calculates filter coefficients on the basis of the gains of the frequency points; a time domain filter performs, on the basis of the filter coefficients, time domain filtering on an audio signal outputted by the adaptive notch filter; an equalizer adjusts a frequency response of the filtered audio signal; an amplitude limiter limits an amplitude of the obtained audio signal to be within a preset range; a digital-to-analog converter converts the audio signal into an electrical signal; and a speaker converts the electrical signal into sound for playback. The present application can reduce PSAP latency.

An audio input signal is digitized via circuitry of an ear-wearable device. An adaptive feedback canceller has an adaptive filter producing an output that is inserted into the digitized audio input signal to cancel feedback. A motion detector provides a motion signal indicative of motion of the ear-wearable device. A processor is operable to determine a change in a feedback path based on the motion signal. The processor causes the adaptive filter to have faster adaption in response to the change in the feedback path is above a first threshold. The processor also causes the adaptive filter to have slower adaption in response to the change in the feedback path being below a second threshold.

An audio input signal is digitized via circuitry of an ear-wearable device. An adaptive feedback canceller has an adaptive filter producing an output that is inserted into the digitized audio input signal to cancel feedback. A motion detector provides a motion signal indicative of motion of the car-wearable device. A processor is operable to determine a change in a feedback path based on the motion signal. The processor causes the adaptive filter to have faster adaption in response to the change in the feedback path is above a first threshold. The processor also causes the adaptive filter to have slower adaption in response to the change in the feedback path being below a second threshold.

Improved adaptive feedback cancellation may be used to improve performance of audio amplification systems, such as hearing assistance devices, sound reinforcement systems, telephony, and other acoustic amplification and reproduction systems. This adaptive feedback cancellation allows a significant increase in the maximum stable gain of the amplification system, such as by increasing gain while reducing or eliminating feedback. This improves the audibility provided by an audio amplification system. This may provide particular improvements for hearing assistance devices that include open fittings or otherwise have substantial acoustic leakage. This adaptive feedback cancellation provides additional protection from a dynamically changing acoustic leakage by continually updating itself to model the changes, thereby providing increased gain while reducing or eliminating feedback.