129results about How to "Avoid howling" patented technology

A sound reinforcement system which enables handsfree and high-quality sound reinforcement without requiring a person who is speaking to move to a microphone or move a microphone. At least one microphone and a plurality of speakers are arranged in a room. A speaker output adjusting section outputs sound picked up by the microphone to the plurality of speakers at predetermined levels.

A noise reduction apparatus includes: a speaker with a speaker unit held by holding means to make it possible to mix sounds emitted from front and rear of a vibration plate of the speaker; a microphone provided in an area where the sounds emitted from the front and rear of the vibration plate of the speaker are mixed and cancelled; and means for supplying a noise reduction audio signal obtained by phase-inverting an audio signal collected by the microphone to the speaker.

A watch of the communications apparatus is worn on a user's wrist by bands. A support member pivoted on the band is then turned so as to extend in the transverse direction of the bands. A speaker unit is provided on the support member so as to face in a transverse direction of the band while a microphone unit is disposed on the support member so as to face in a direction perpendicular to a surface of the band. When a user communicates with the other party, the speaker unit provided on the support member is directed toward the user's ear. This causes the microphone unit provided on the support member to be directed easily toward the user's mouth. Alternatively a hinged lid is provided the lid carrying a key-in unit or a display and a speaker unit.

The invention provides a communication method for a mobile terminal. The communication method comprises that when a specific program process is operated on a mobile terminal and a specific group conversation program is operated to carry out a group conversation, voice signals of other users in the group and sound signals of the specific program process are subjected to howling suppression processing; the voice signals of other users in the group and the sound signals of the specific program process which are subjected to the howling suppression processing are played through a telephone receiver of the mobile terminal; a microphone of the mobile terminal is employed to acquire voice signals; the voice signals acquired by the microphone are subjected to filtering processing; and the filtered voice signals are sent to other users in the group. According to the invention, when a group conversation is carried out on the mobile terminal, the voice signals in the group conversation are subjected to the howling suppression processing firstly, then the voice signals which are subjected to the howling suppression processing are played through the telephone receiver, the voice signals acquired by the telephone receiver are subjected to filtering processing, and howling in the group conversation can be prevented.

A sound reinforcement system which enables handsfree and high-quality sound reinforcement without requiring a person who is speaking to move to a microphone or move a microphone. At least one microphone and a plurality of speakers are arranged in a room. A speaker output adjusting section outputs sound picked up by the microphone to the plurality of speakers at predetermined levels.

The invention discloses a headset identification device and a headset identification method in a mobile communication terminal, which is used for detecting whether a headset is accessed to the mobile communication terminal or not. The headset identification device in the mobile communication terminal comprises a handset jack, a baseband analog-to-digital converter, a de-jitter screening module, a first-stage judgment identification module, and a second-stage judgment identification module, wherein the first-stage judgment identification module is used as a trigger condition for second-stage judgment; and the second-stage judgment identification module finishes the identification function to the headset. The device has the advantages that the device, based on the prior headset circuit structure, overcomes the defects of error hangup, error answering and squeaking by adding double headset plugging / unplugging judgment besides the realization of basic functions such as the answering / hangup of a dual-track headset receiver, a headset MIC and headset keys.

A noise reduction apparatus includes: a speaker with a speaker unit held by holding means to make it possible to mix sounds emitted from front and rear of a vibration plate of the speaker; a microphone provided in an area where the sounds emitted from the front and rear of the vibration plate of the speaker are mixed and cancelled; and means for supplying a noise reduction audio signal obtained by phase-inverting an audio signal collected by the microphone to the speaker.

A watch of the communications apparatus is worn on a user's wrist by bands. A support member pivoted on the band is then turned so as to extend in the transverse direction of the bands. A speaker unit is provided on the support member so as to face in a transverse direction of the band while a microphone unit is disposed on the support member so as to face in a direction perpendicular to a surface of the band. When a user communicates with the other party, the speaker unit provided on the support member is directed toward the user's ear. This causes the microphone unit provided on the support member to be directed easily toward the user's mouth. Alternatively a hinged lid is provided the lid carrying a key-in unit or a display and a speaker unit.

A handsfree call apparatus includes: a speaker held in the vicinity of a user's ear by a holding unit with a speaker unit thereof not being attached to a baffle board so as to mix sounds emitted from the front and back of a diaphragm thereof; a microphone, which is provided to a region where sounds emitted from the front and back of the diaphragm of the speaker are mixed and canceled out, configured to collect the call voice of the user; an output unit configured to output a call voice signal of the user from the microphone to transmit this to a call partner; and an input unit configured to receive a call voice signal from the call partner to supply this to the speaker.

A howling canceler apparatus is used in a sound amplification system having a sound amplifier which connects with a multiple of speakers and one or more of microphones. In the howling canceler apparatus, a plurality of adaptive filters are provided in correspondence to a plurality of feedback transmission paths which are formed between each of the multiple of the speakers and each of the one or more of the microphones. Each adaptive filter is set with a filter coefficient simulating a transfer function of the corresponding feedback transmission path for processing the output sound signal to generate a simulation signal simulating a feedback sound traveling through the corresponding feedback transmission path. Each adaptive filter is capable of setting its own filter coefficient based on the output sound signal and a residual signal. A subtraction portion subtracts the simulation signal outputted from the adaptive filter from the input sound signal inputted from the microphone to generate the residual signal, and outputs this residual signal to the adaptive filter and to the sound amplifier.

A voice analysis unit (13) extracts voice feature quantities such as format and pitch from an inputted voice signal. On the basis of the extracted voice feature quantities, a masking sound generation unit (14) processes sound source data (generic masking sounds) recorded in a database (15), and generates a masking sound for outputting. An example of a generic masking sound is a recording of voices of multiple people including both male and female voices, and including disturbance noise that does not have a lexical meaning (content of conversation not being comprehensible). The masking sound generation unit (14) matches the format of the disturbance noise to the format of the input voice signal format. The generated masking sound does not have a lexical meaning, and includes disturbance noise having a similar voice quality and pitch to that of a speaker; hence, it is difficult for a listener to understand what is actually being said by the speaker.

The invention discloses a mobile phone, which is provided with a processor. The mobile phone further comprises a first microphone, a second microphone and an analogue switch, wherein the first microphone is arranged at the bottom of a mainboard of the mobile phone; the second microphone is arranged on the middle part of the mainboard of the mobile phone; and the analogue switch is controlled by the processor, and is used for switching the first microphone on to work in a normal call mode of the mobile phone, and switching the second microphone on to work in a hand-free call mode of the mobile phone. The invention also discloses a working method for the mobile phone. Due to the adoption of a dual-microphone design, the aim of preventing the squeal and echo of the mobile phone in the hand-free call mode is fulfilled.

The invention relates to a self-lubricating vertical orientating vibrating wheel structure subjected to counterweight by using a liquid. The self-lubricating vertical orientating vibrating wheel structure comprises a vibrating wheel, a vibration exciter cylinder, a transmission shaft and a cylinder-shaped gear box, wherein a first forwards-rotating eccentric wheel, a backwards-rotating eccentric wheel and a second forwards-rotating eccentric wheel are sequentially arranged along the axial length direction of the transmission shaft, the backwards-rotating eccentric wheel and the first forwards-rotating eccentric wheel are connected with each other through a change gear set; the cylinder-shaped gear box is provided with a gear cavity and an eccentric wheel cavity corresponding to the change gear set and the first forwards-rotating eccentric wheel; the upper end of the cylinder-shaped gear box is provided with a lubricating flow channel, and the lower end of the cylinder-shaped gear box is provided with a liquid outlet; the vibration exciter cylinder is peripherally provided with oil boxes used for rain falling lubrication corresponding to the inner walls of cylinder cavities positioned on the positions of the cylinder-shaped gear box, the second forwards-rotating eccentric wheel and the backwards-rotating eccentric wheel; and the outer wall of the vibration exciter cylinder, the inner wall of the vibrating wheel and ring plates positioned on two ends of the vibrating wheel are encircled to form a sealing cavity used for filling a counterweight liquid together. The self-lubricating vertical orientating vibrating wheel structure disclosed by the invention achieves the sufficient lubrication effect of various bearings and gears inside equipment and can realize the purposes of counterweight and high-efficiency radiation of the vibrating wheel through the counterweight liquid.

The invention relates to the electronic equipment technical field, and specifically relates to a microphone equipment anti-interference method and microphone equipment; the method comprises the following steps: the microphone equipment obtains a target audio signal received by a microphone on the microphone equipment; the microphone equipment extracts the target voiceprint characteristics of the target audio signal; the microphone equipment determines whether the extracted target voiceprint characteristics are matched with preset valid user voiceprint characteristics or not; if not, the microphone equipment lowers the microphone current reception sensitivity absolute value to be smaller than or equal to a preset threshold, thus preventing the loudspeaker from forming squealing. The methodcan prevent the microphone equipment loudspeaker from forming squealing when a non-valid user uses the microphone, thus improving the microphone equipment output sound quality.

An audio apparatus includes: a connector that supports a multipolar plug including a plurality of plug terminals, the connector having a plurality of connector terminals including an input terminal of an audio collection section and an output terminal that outputs a noise canceling signal; a signal amplification section that amplifies a combined signal generated by combining the noise canceling signal and a reproduction audio signal, the signal amplification section being provided on an audio signal line that connects the input terminal and the output terminal; a detection section that detects whether the multipolar plug is inserted or pulled out by detecting change of voltage of a voltage supply line connected to the audio signal line; and a suppression section that suppresses output from the signal amplification section when the multipolar plug is pulled out but does not suppress the output when the multipolar plug is inserted.

The invention discloses an air purification device adopting plasma discharge combined with a modified molecular sieve and a using method thereof. The device comprises a filter screen module, a plasma purification device, a humidification pressurization device and a detection display control module. A gas outlet of the filter screen module is connected with a gas inlet of the humidification pressurization device, another gas outlet is connected with a dry air inlet of the plasma purification device, and a gas outlet of the humidification pressurization device is connected with a wet air inlet of the plasma purification device. According to the method, air is filtered through the filter screen module to be respectively sent to the plasma purification device and the humidification pressurization device; the air enters a humidification water tank to undergo water atomization through an ultrasonic nebulizer and then is sent to a wet air leading-in pipe of the plasma purification device; and the air entering the plasma purification device is purified through corona discharge. According to the air purification device and the using method, the W type plasma purification device is adopted to be favorable for prolonging reaction time and solve the problem of squeal; dry and wet air separation is adopted to promote gas mixing, and the VOC pollutant clearance rate is high.

The object is to provide a bone-conduction handset, which has its main body (1) sufficiently isolated from a bone-conduction speaker unit (3) so that: the chances that howling and sound leaking may occur are reduced; and, the handset is improved in easiness in use. In the handset, the speaker unit (3) is mounted on the main body (1) through a speaker mounting member (2) made of a vibration-proof material. The mounting member (2) is characterized by comprising a connection portion (6), which is disposed perpendicularly to both the handset body (1) and the speaker unit (3) in a manner such that the main body (1) and the speaker unit (3) have their opposed inner surfaces disposed adjacent to opposite sides of the connection portion (6), whereby the main body (1) is isolated from the speaker unit (3).

An embodiment of the invention provides an audio noise reduction method and device. The method comprises the following steps: obtaining an audio signal to be processed and carrying out filtering processing on the audio signal to generate a noise reduction control signal same in value and opposite in phase with the audio signal; when detecting that signal amplitude at some time point of the noise reduction control signal meets an amplitude limit starting threshold value, starting an amplitude limiter, and carrying out attenuation processing on the signal amplitude corresponding to a time point after the time point, wherein since one condition under which howling occurs is that the signal amplitude reaches a certain value, by reducing the signal amplitude corresponding to the time point after the first time point, the howling occurrence condition can be damaged, and occurrence of the howling can be prevented; and at last, outputting the noise reduction control signal obtained after attenuation processing, and carrying out superposition on the noise reduction control signal obtained after attenuation processing and the noise signal to realize noise reduction of the audio signal to be processed.

The invention provides a bone conduction glasses frame comprising a glasses frame body and two glasses legs. A microphone is arranged on the glasses frame body, bone conduction loudspeakers are arranged on the glasses legs respectively, and the glasses legs are provided with control parts used for independently controlling the bone conduction loudspeakers respectively. Firstly, the loudspeakers synchronously working on the two sides of the glasses legs independently operate the loudspeakers on the two sides through the independent control parts respectively, a user can carry out independent hearing compensation according to the two ears, and the performance of glasses is improved; secondly, the microphone is subjected to shock absorption and anti-noise treatment, so that microphone howlingis reduced or avoided, and the outside sound collection performance of the microphone is improved; furthermore, the positions of the loudspeakers are adjusted through an adjusting device according tothe size of the face of the user, so that the loudspeakers are always at the most ideal positions, and a good auditory effect is achieved.

The invention provides a howling suppression method and device in an intercom system. The method comprises the steps of sending intercom instructions to all monitor Bluetooth modules through utilization of an intercom host Bluetooth module; reporting intercom events to a processor by monitors, searching sending powers and receiving powers of the monitor Bluetooth modules, calculating the distancebetween the monitors and the intercom host according to the sending powers and the receiving powers, and reporting the distance to intercom monitor processors; and judging monitored distance r and a preset threshold R by the monitor processors, judging that the monitors and the intercom host are too close and howling is liable to occur if the r is smaller than or equal to the R, and automaticallycalling a preset suit of audio parameters A for reducing downlink gain by the monitor processors, thereby controlling the monitors to reduce the downlink gain. According to the method and the device,through utilization of the distance between hardware detection machines, when it is judged that the distance between the monitors and the intercom host is smaller than the set threshold, the close distance howling is avoided by automatically reducing the downlink link gain of the monitors.

The invention relates to a liquid reservoir, which comprises a container, an end plate, an extraction tube and a drying part, wherein the container consists of bottom cylindrical parts; the end plate is provided with a refrigerant inlet and a refrigerant outlet; the extraction tube is kept pendent from the end plate used for blocking the upper ends of the cylindrical parts and is arranged at a slightly central position of the container; the drying part is arranged outside the extraction tube; the upper end of the extraction tube is connected with the refrigerant outlet; a liquid refrigerant retained at the bottom of the lower end of the container from the lower end of the extraction tube flows out through the refrigerant outlet; and the container consisting of the cylindrical parts comprises a corrugated part which is formed on the lower part of the container. By the liquid reservoir, the bottom of the lower end of the container is formed by the corrugated part, so automobile vibration and other load influences or impact influence brought by change of high-pressure refrigerant pressure can be absorbed through the corrugated part, and stable operation of the liquid reservoir can be maintained; and moreover, resonance of a high-pressure pipeline and squeal of an expansion valve can be avoided.

The invention discloses a tone quality optimization device for a voice communication system. The tone quality optimization device comprises a system control module, wherein the system control module calls an echo suppression module to communicate with an audio stream receiving module; the system control module calls a silence detection module to communicate with the audio stream receiving module;the system control module calls ae comfortable noise module to communicate with an audio stream output module; the system control module calls a network jitter processing module to communicate with the audio stream output module; a working process of the echo suppression module comprises the following steps of acquiring a configuration file to determine an echo cancellation mode according to the type and the version of the system; caching received voice stream into a data space in a communication process; comparing a newest receiving and sending packet with a content in the cache, screening and filtering the echo part, and computing offset frequency to realize an effect of echo cancellation; and receiving the released cached data. According to the device, a plurality of technologies are added in the communication process, so that the communication can be clearly carried out, and the network burden can be also reduced.

The invention discloses a piezoelectric plate driving nozzle baffle disc pressure servo valve with a main valve element hydrodynamic force compensation function. The piezoelectric plate driving nozzlebaffle disc pressure servo valve comprises an upper shell, an adjusting assembly, a first nozzle, a second nozzle, a lower shell, a valve element, a first reset spring, a second reset spring, an oilfilter, a first shuttle valve and a second shuttle valve. Piezoelectric plate driving baffle discs are utilized to substitute an original torque motor electric-mechanical mode to avoid the defects that a traditional torque motor is complex in composition, high in mounting requirement, poor in reliability and the like, the baffle discs are used for substituting baffles, occurrence of high-frequencyfluttering and howling of thin and long metal plates is avoided, system stability is improved, and the size and the weight of a servo valve body are also decreased advantageously to a certain extent;and meanwhile, endurance of piezoelectric plate driving to severe environments such as high-temperature and high-magnetic-field interference is higher than that of the torque motor, steady-state hydrodynamic force changed with change of the opening degree and the loading pressure during valve element moving can be compensated greatly, and the obvious effect on improvement of static accuracy of the pressure servo valve is achieved.

The invention provides a signal processing device and a stringed instrument. The signal processing device is composed of an acquiring unit, a filter unit and a changing unit. The acquiring unit acquires a signal indicating vibration of a string. The filter unit performs convolution operation on the signal acquired by the acquiring unit according to a filter coefficient and outputs a resulting signal. The filter coefficient is set such that the resulting signal has a frequency response containing a plurality of peak waveforms associated with resonance of a body of a stringed instrument within a specific frequency range. The changing unit changes the filter coefficient so as to change a peak value of each of the peak waveforms while maintaining a width of each of the peak waveforms in the frequency response.

A signal processing device is composed of an acquiring unit, a filter unit and a changing unit. The acquiring unit acquires a signal indicating vibration of a string. The filter unit performs convolution operation on the signal acquired by the acquiring unit according to a filter coefficient and outputs a resulting signal. The filter coefficient is set such that the resulting signal has a frequency response containing a plurality of peak waveforms associated with resonance of a body of a stringed instrument within a specific frequency range. The changing unit changes the filter coefficient so as to change a peak value of each of the peak waveforms while maintaining a width of each of the peak waveforms in the frequency response.

The invention discloses a device for generating warning sound of a vehicle and a vehicle. The device for generating warning sound of the vehicle comprises a sounding system. The sounding system comprises a microphone, a signal-processing circuit, and a loudspeaker. The microphone is used for detecting background noise to generate a background noise signal. The signal-processing circuit is used for receiving the background noise signal output by the microphone, amplifying the power of the background noise signal and then outputting the background noise signal with amplified power to the loudspeaker. The loudspeaker is used for playing the signal output by the signal-processing circuit. The device for generating warning sound of the vehicle further comprises a device for adjusting the relative position of the microphone and the loudspeaker. The device for adjusting the relative position of the microphone and the loudspeaker is used for adjusting, when a warning condition is triggered, the relative position of the microphone and the loudspeaker in order that the sounding system forms a closed-loop audio feedback loop and sounds. The invention also discloses a vehicle. The device for generating warning voice of the vehicle may sound in a simple way in order to draw pedestrians' attention for improving safety.

The invention belongs to the technical field of motors, and especially relates to a motor cooling structure. The motor cooling structure comprises a motor shell, a cylindrical cover body is arranged at the end of the motor shell, an impeller is arranged in a cavity defined by the cover body and the motor shell, an air inlet is formed in the side wall of the cover body, an air outlet is formed by agap between the side wall of the cover body and the motor shell, and a sound absorption layer is arranged on the inner wall face of the bottom wall of the cover body. By changing the arrangement of the air inlets in the cover body, the flowing path of cooling air flow is changed, whistling caused by air flow convection is avoided, the sound absorbing material is arranged in the cover body, noisegenerated when the air flow directly impacts the cover body is avoided, and therefore, the working noise of the cooling structure is greatly reduced, and stable operation of the motor is guaranteed.

The invention discloses a dynamic balance method of an impeller, which comprises the steps of 1, conducting a dynamic balance test on the impeller by using a dynamic balance machine, and determining the phase required to be balanced and the required balance mass of the impeller according to the indication of the dynamic balance machine; 2, drilling a plurality of counterweight holes in the phase positions of the radial edges of a wheel disc and a wheel cover of the impeller correspondingly; 3, calculating the weight of lead water counterweight; 4, pouring the lead water counterweight into thecounterweight holes, and plugging the counterweight holes by using aluminum welding; 5, conducting a dynamic balance test on the impeller by using the dynamic balance machine, detecting whether the unbalance amount of the impeller is within a specified range or not, if so, entering the next step, and if not, entering the step 1; and 6, ending the dynamic balance test. According to the dynamic balance method of the impeller, the surface of the impeller is free of uneven balancing weights and holes, aerodynamic noise caused by friction between the balancing weights or the holes and air is greatly reduced, and the generation of howling is avoided.

The invention discloses a torsional absorber, and belongs to the field of automobiles. The torsional absorber is arranged in the clutch hub of an automobile and is arranged side by side with a clutch plate group; the torsional absorber comprises a mass body, two friction plates, a retainer, a retainer baffle and an elastic collar, wherein the retainer is welded on the external surface of a clutchinner hub, the retainer baffle is arranged in the retainer and relatively fixed with the retainer; the retainer baffle supports the quality body, and is pressed by the elastic collar; and one friction plate is arranged between the quality body and the clutch hub, and the other friction plate is arranged between a mass block and the retainer baffle. The embodiment of the invention ensures the massbody and an assembly which is composed of the retainer and the retainer baffle to rotate together along the clutch inner hub, thereby automatically absorbing the vibration generated by a clutch system and relative parts; and the vibration of the automotive transmission is effectively reduced, the squeal generated by vibration is avoided.