40results about How to "Suppress howling" patented technology

The invention discloses a voice signal processing method and device, and the method comprises the following steps: step 1, receiving a decoded far-end signal, and collecting a near-end signal while playing the decoded far-end signal; step 2, estimating and compensating the delay, and performing data alignment operation on the far-end signal and the near-end signal; step 3, sending the aligned far-end and near-end signals into an adaptive echo suppression unit with feedback, and suppressing echoes in the near-end signals; step 4, inhibiting residual echoes and howling in the near-end signal; step 5, suppressing the noise in the near-end signal; and step 6, transmitting the near-end signal through the network. Through the method and the device, the echo, the residual echo, the howling and the noise in the full-duplex call can be suppressed. The problems of echo, howling, noise and the like in the voice talkback can be solved with relatively low complexity.

The invention provides an anti-howling audio signal processing method and a device thereof. The anti-howling audio signal processing method comprises a step of receiving a singing request which comprises the identification of a song to be sung, obtaining a background audio signal corresponding to the identification of the song to be sung, a step of obtaining a far end reference signal and a near end input signal, carrying out howling suppression processing on the near end input signal according to the far end reference signal and obtaining a first audio signal, and a step of mixing the first audio signal and the background audio signal to obtain a second audio signal. According to the embodiment of the invention, the near end input signal is subjected to the howling suppression processing, the howling generated in a speaking amplification environment is effectively suppressed, the scene of a commercial karaoke room can be simulated really, and a user enjoys the function of karaoke at any time.

The invention provides a loudspeaker array sound reinforcement system for inhibiting howling. The system comprises an input signal processing module (1), a filter module (2), a multichannel power amplifier (3) and a loudspeaker array (4); the filter module (2) comprises a parameter setting unit (201), a filter group generation unit (202) and a filter group processing unit (203); the filter group generation unit (202) is used for calculating convolution matrixes Hm and Hn formed by time domain impulse response at each control point of the loudspeaker array (4) according to parameters set by the parameter setting unit (201); calculating matrixes Rb and Rd accordingly; calculating a matrix Q according to an average amplitude response fluctuation parameter expression of an equilibrium control point in a sound reinforcement target area; solving a vector w according to Rb, Rd and Q to ensure a maximum value of time domain acoustic energy contrast control of single point equilibrium; converting the vector w into a filter form; and acquiring filter parameters of the filter group processing unit (203).

A howling suppressing apparatus able to mitigate the deterioration of sound quality in processed sound that is caused by howling, even in an acoustic feedback loop environment. The howling suppressing apparatus is provided with: a delay device (103) which delays an input signal and outputs a reference signal; a signal separation unit (104) which includes an adaptive filter (109) that adaptively updates the filter coefficient and thereby extracts a periodic signal component from the reference signal; a howling detection unit (105) which uses at least the signal of the periodic signal component outputted from the adaptive filter (109) to detect whether howling has occurred; and a howling suppressing unit (106) which includes a suppressing filter (111) which acquires the filter coefficient from the adaptive filter (109) when howling has been detected by the howling detection unit (105) and extracts the periodic signal component from the reference signal based on that filter coefficient, and a subtracter (112) which subtracts the periodic signal component from the input signal to thereby output an error signal.

The invention discloses a variable-step-size hearing aid adaptive echo cancellation device and echo cancellation method, and the device comprises a single-frequency sound detector, a step size controller, and an adaptive filter. The single-frequency sound detector is used for carrying out the spectrum energy analysis of an error signal sample, calculating a current hearing aid system state parameter, and transmitting the parameters to a step length controller; the step length controller is used for judging the state of the system according to the system state parameter obtained from the single-frequency sound detector and the normalization error mean value, calculating a time-varying step length parameter of the adaptive filter, and transmitting the time-varying step length parameter to the adaptive filter; and the adaptive filter is used for filtering the cached far-end signal sample of the loudspeaker, calculating an estimated echo signal and outputting the estimated echo signal, anditeratively updating the adaptive filter according to the time-varying step parameter calculated by the step controller. The device and method solve the problems that an adaptive filter is low in convergence rate and too high in algorithm complexity and is difficult to realize in the prior art, and are suitable for a digital hearing aid system.

The invention discloses a microphone anti-whistling method and system based on inaudible sound waves. To achieve the effect of avoiding howling. The system includes an inaudible sound wave output module, an inaudible sound wave sampling module, a main control module, an audio output control module, a power amplifier, and a loudspeaker that are arranged on the microphone host. The inaudible sound wave output module, the inaudible sound wave sampling module, the audio The output control module is respectively connected with the main control module, and the audio output control module is connected with the speaker through the power amplifier. The present invention does not change the frequency response characteristics of the audio system, and can meet all high-demand occasions.

The invention discloses a howling suppression method, and the method comprises the following steps: obtaining an envelope detection signal corresponding to a howling segment in an audio input signal when the audio input signal is obtained; when the detection value of the envelope detection signal is less than or equal to a first preset value and greater than or equal to a second preset value, performing frequency shift processing on the howling segment; when the detection value of the envelope detection signal is greater than the first preset value, performing frequency shift processing and negative feedback processing on the howling segment; and outputting audio information according to the howling segment subjected to the frequency shift processing or the howling segment subjected to thefrequency shift processing and the negative feedback processing. The invention further discloses a howling suppression device and a storage medium, frequency shift processing and negative feedback processing are conducted on howling fragments according to changes of envelope detection signal detection values, formation of positive feedback feedback is destroyed, howling of sound is suppressed, and the howling suppression effect is better.

An embodiment of the application discloses a howlround preventive method and device, electronic equipment and a storage medium. The method includes: monitoring whether a target sound loop is present between first electronic equipment and second electronic equipment; if yes, determining whether howlround is present in the first and second electronic equipment according to the target sound loop anda sound signal received by the first electronic equipment; if yes, processing the sound signal in a preset howlround inhibition mode. By monitoring the target sound loop between the first electronic equipment and the second electronic equipment and the sound signal received by the second electronic equipment, it is possible to timely detect the howlround present in the first electronic equipment or the second electronic equipment; therefore, the howlround can be inhibited before worsening; the whole process has no need for cutting off sound input data, and howlround can be effectively prevented.

The invention relates to a howling suppression method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a current audio signal corresponding to a current time period, and performing frequency domain transformation on the current audio signal to obtain a frequency domain audio signal; dividing the frequency domain audio signal to obtain sub-bands, and determining a target sub-band from the sub-bands; obtaining a current howling detection result and a current voice detection result corresponding to the current audio signal, and determining a sub-band gain coefficient corresponding to the current audio signal based on the current howling detection result and the current voice detection result; obtaining a historical sub-band gain corresponding to the audio signal in the historical time period, and calculating a current sub-band gain corresponding to the current audio signal based on the sub-band gain coefficient and the historical sub-band gain; and performing howling suppression on the target sub-band based on the current sub-band gain to obtain a first target audio signal corresponding to the current time period. By adopting the method, the howling suppression accuracy is improved.

The invention discloses a power amplifier system and a howling suppression circuit. The howling suppression circuit comprises a first filter, a second filter, a sine wave generator, a phase shifter, a first multiplier, a second multiplier, and a summator. The first filter and the second filter adjust the phases of input sound signals, so that the phase of the sound signal output by the first filter differs by 90 degree from the phase of the sound signal output by the second filter. The sound signal output by the first filter and a sine wave signal are multiplied through the first multiplier. The sound signal output by the second filter and a cosine wave signal are multiplied through the second multiplier. The sound signals output by the first multiplier and the second multiplier are added through the summator, so that the phases of the sound signals output by the first multiplier and the second multiplier are different from the phases of the sound signals input into the first filter and the second filter, so as to undermine conditions causing howling and suppress the howling.

The invention discloses an anti-howling system for an artificial intelligence conference, and particularly relates to the anti-howling field, the anti-howling system comprises an inner shell and an outer shell sleeving the inner shell, the inner shell is detachable, the top of the inner shell is provided with a loudspeaker used for sounding, the outer shell comprises a top plate attached to the top of the inner shell, and the top plate is provided with a plurality of through holes; the bottom of the edge of the top plate is provided with an interlayer part for sound insulation, a sound insulation plate is attached to the outside of the interlayer part, the interlayer part and the sound insulation plate are used for shielding a radiation area of the loudspeaker, the outer wall of the sound insulation plate is provided with a plurality of microphone heads, and the top and the bottom of the vacuum plate are provided with anti-howling assemblies. The anti-howling assemblies are used for separating the pickup areas of the plurality of microphone heads from the radiation area of the loudspeaker. According to the invention, when the microphone head is used, the sound playing area of the loudspeaker is avoided, the sound radiation area of the loudspeaker is not overlapped with the use area of the microphone head, and the effect of suppressing audio howling can be well realized.

The invention discloses a method and system for processing signals in network voice communication. The method comprises the steps that the voice signals of the network voice communication are received, and low-and-medium frequency signals are acquired from the voice signals according to voice frequency included in the voice signals the low-and-medium frequency signals are voice data with frequency components in the voice signals being within a low-and-medium threshold range; restraining power is obtained according to power, corresponding to low-and-medium frequency signals, in the voice signals; whether power, corresponding to high-frequency signals, in the voice signals is larger than the restraining power or not is judged, and if the power is larger than the restraining power, the power, corresponding to the high-frequency signals, in the voice signals is attenuated below the restraining power. According to the method and system, howling can be effectively restrained without affecting the fidelity of communication voice, and the processing speed of howling restraining can be improved.