40results about How to "Suppress howling" patented technology

The invention discloses an audio signal processing method, a model training method and a related device, and the method comprises the steps: inputting an audio input signal into a machine learning model, so as to obtain a first squeal point and a corresponding first gain value; and processing a second howling point in the audio input signal according to the second gain value to obtain an audio output signal. Therefore, howling in the audio input signal is suppressed, howling is suppressed in the initial stage, and gain circulation cannot be carried out. Due to the correspondence of the indication howling points in the machine learning model and the convenience of model calculation, the processing process is rapid, effective audio signals are not affected, and the accuracy and efficiency ofaudio processing are improved.

A howling canceller which suppresses occurrence of howling even when an open loop gain exceeds “1” in the whole reproduction band. In the howling canceller, an adaptive filter (107) operates a digital received voice signal with a tap coefficient to generate a pseudo echo; a subtractor (108) subtracts the pseudo echo from a digital transmitted voice signal to generate a residual signal; and an amplitude limiting circuit (110) limits the absolute value of the amplitude of the digital received voice signal to be equal to or smaller than a predetermined threshold which ensures that all of a D / A converter (101), a power amplifier (102), a speaker (103), a microphone (104), a microphone amplifier (105), and an A / D converter (106) operate in a linear operation area, and outputs the amplitude-limited digital received voice signal to the D / A converter (101) and the adaptive filter (107).

The invention belongs to the field of hydraulic engineering, and relates to a pressure relief valve with an adjustment device capable of suppressing howling. A spring (10) is sleeved on a valve core (6), a spring seat (2) is sleeved on the spring (10), and the spring seat (2), the spring (10) and the valve core (6) are installed in the valve body (5), and the valve seat (11) is inserted into the valve body (5) and positioned in contact with the valve body (5) through the raised end surface; adjust The stud (9) is threaded into the valve body (5) and contacts with the left end of the valve core (6), the adjusting gasket (7) forms a gear internal mesh with the adjusting stud (9), and the hexagon socket cap screw ( 8) Screw into the valve body (5) through the through hole of the adjusting washer (7), so as to constrain the degree of freedom of rotation of the adjusting stud (9) and the adjusting washer (7) along the thread direction. The invention has reliable structure and convenient pressure adjustment.

The invention discloses a howling suppression method, a device, a sound amplification device and a storage medium for amplifying equipment. The howling suppression method for the sound amplification equipment is applied to the sound amplification equipment. The howling suppression method for the sound amplification equipment includes: Acquiring a speech signal to be amplified; performing sound field estimation on the speech signal through a preset adaptive filter to output a reference signal fed back to the amplifying device for howling suppression. The present invention estimates the feedback path of the sound field through the adaptive filter, which can realize the mutual cancellation of the artificially generated speech signal to be amplified and the reference signal actually fed back by the filter, thereby effectively reducing the feedback interference of the sound field and achieving the purpose of suppressing howling .

The invention discloses a voice signal processing method and device. The method includes 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 Compensate the delay and perform data alignment operation on the far-end and near-end signals; Step 3, send the aligned far-end and near-end signals to the adaptive echo suppression unit with feedback to suppress the echo in the near-end signals; Step 4, Suppressing the residual echo and howling in the near-end signal; step five, suppressing the noise in the near-end signal; step six, transmitting the near-end signal through the network, through the present invention, the echo, residual Echo, howling, and noise can be suppressed, and problems such as echo, howling, and noise in voice intercom can be solved with relatively low complexity.

The invention discloses a microphone howling suppression circuit in an intercom system, comprising: a first-stage voltage limiting circuit and a second-stage negative feedback gain automatic adjustment AC in-phase amplifying circuit, a first-stage voltage limiting circuit, Including sequential connection: input stage coupling DC blocking capacitor, reverse amplifier circuit, output stage coupling DC blocking capacitor, diode series clamping circuit; second stage negative feedback gain automatic adjustment AC non-inverting amplifier circuit, including: positive phase AC The amplifier circuit and the negative feedback gain automatic adjustment circuit connected to it, the coupling DC blocking capacitor, and the AC channel amplification coupling capacitor; the first-stage voltage limiting circuit and the second-stage negative feedback gain automatic adjustment AC non-inverting amplifier circuit through The coupling capacitor is connected, and the two-stage circuits are connected to the DC bias circuit. This design can ensure that the circuit suppresses the howling noise while the voice signal is not lost, and optimizes and improves the howling problem caused by the microphone in the audio system.

An embodiment of the invention discloses an audio frequency data communication method, device and system and belongs to the technical field of communication. First communication links between a main device in a first audio frequency sub-meeting-place and other client ends in the first audio frequency sub-meeting-place are respectively established; via the first communication link, first sound mixing signals that are received are sent to the other client ends in the first audio frequency sub-meeting-place, and the other client ends are enabled to receive the first sound mixing signals synchronously; if the first sound mixing signals are played later than the time when the first sound mixing signals are received by the main device, then the first sound mixing signals tend to be played synchronously by all client ends in the first audio frequency sub-meeting-place, the first sound mixing signals are sound mixing signals of audio frequency signals of other audio frequency sub-meeting-places, a problem that audio feedback squeal and desynchrony are caused when sound of the audio frequency sub-meeting-place is played in the same audio frequency sub-meeting-place can be prevented, and mobile terminals such as mobile phones and the like can be used as client ends in each audio frequency sub-meeting-place.

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 discloses a howling suppression method, which includes the following steps: when an audio input signal is acquired, acquiring an envelope detection signal corresponding to a howling segment in the audio input signal; 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, frequency shift processing is performed on the howling segment; when the detection value of the envelope detection signal is When the value is greater than the first preset value, perform the frequency shift processing and negative feedback processing on the howling segment; according to the howling segment after the frequency shift processing or the frequency shift processing and the negative feedback The processed howling segment outputs audio information. The invention also discloses a howling suppressing device and a storage medium. According to the change of the detection value of the envelope detection signal, frequency shift processing and negative feedback processing are performed on the howling segment, which destroys the formation of positive feedback and suppresses the sound Howling, and the suppression effect of howling is better.