50results about How to "Reduce sound distortion" patented technology

In a piezoelectric speaker, an acoustic diaphragm is thicker than a piezoelectric thin film and is formed of a more flexible and higher elasticity material than the piezoelectric thin film, thereby greatly improving output sound pressure in a low frequency band and reducing sound distortion. Further, the piezoelectric thin film is attached to the acoustic diaphragm in an inclined structure in which the piezoelectric thin film is horizontally turned from the acoustic diaphragm, thereby preventing a standing wave from being created by structural symmetry and minimizing sound distortion.

A structure of a loudspeaker is designed to increase a heat dissipation effect while decrease distortion of sound wave. The loudspeaker has a speaker frame, a diaphragm connected to the speaker frame in a manner capable of vibration, a voice coil connected to the diaphragm to vibrate the diaphragm, a magnetic assembly configured by an inner cylinder and an outer cylinder, a shorting member mounted on an outer surface of the inner cylinder and inserted in a gap of the magnetic assembly, shorting member extensions integrally connected with the shorting member and extended in radial directions of the loudspeaker, and openings formed in the radial directions on the outer cylinder of the magnetic assembly to receive the shorting member extensions. The shorting member, plurality of shorting member extensions, and speaker frame are integrally formed with one another to dissipate heat generated by the voice coil.

Disclosed is a method of efficiently removing noise. The method includes: deciding a noise section by attenuating characteristics of a voice in a voice signal mixed with noise; determining the type of the noise in the decided noise section; and removing the noise from the noise-mixed voice signal by using noise information obtained through the determination. A clustering method or a similarity level measurement method is used to determine the type of the noise. Even in a voice signal that is mixed with various types of noise, noise can be precisely removed and thus distortion of a sound quality can be minimized.

A speaker may include a center pole and a voice coil bobbin having a bobbin that may include nonmagnetic and electric conductor layers and insulator layers disposed between the electric conductor layers. An electrostatic capacity, which is formed between the center pole and the voice coil bobbin, is detected and outputted as an electrical signal.

When a channel signal, such as a 22.2 channel signal, is rendered into a 5.1 channel signal, a three-dimensional (3D) audio may be reproduced by using a two-dimensional (2D) output channel, however, when an elevation angle of an input channel is different from a standard elevation angle, if elevation rendering parameters according to the standard elevation angle are used, distortion may occur in a sound image. In order to solve the aforementioned problem according to the related art and to prevent front-back confusion due to a surround output channel, an embodiment of the present invention provides a method of rendering an audio signal, the method including receiving a multichannel signal including a plurality of input channels to be converted to a plurality of output channels; adding a preset delay to a frontal height input channel so as to allow each of the plurality of output channels to provide a sound image having an elevation at a reference elevation angle; changing, based on the added delay, an elevation rendering parameter with respect to the frontal height input channel; and preventing front-back confusion by generating, based on the changed elevation rendering parameter, an elevation-rendered surround output channel delayed with respect to the frontal height input channel.

A speaker may include a voice coil bobbin and a center pole. The voice coil bobbin may include a nonmetallic pipe body as a base of the voice coil bobbin, a first nonmagnetic and electric conductor film which is formed on an inner peripheral face of the pipe body, and a second electric conductor film which is formed on an outer peripheral face of the pipe body such that the first electric conductor film is covered by the second electric conductor film through the pipe body. An electrostatic capacity that is formed between the voice coil bobbin and the center pole is detected and outputted as an electric signal.

The invention provides a preparation method of a titanium foil, the titanium foil, and a titanium voice diaphragm manufactured by use of the titanium foil, wherein the preparation method of the titanium foil comprises the following steps of performing the first group of cold rolling treatment on a titanium blank to form a titanium belt which is 0.4-0.6mm thick; performing the second group of cold rolling treatment on the titanium belt to form the titanium foil, wherein the first group of cold rolling treatment comprises at least two times of cold rolling treatment, and the reduction amount of the thickness of the titanium blank in the first time of cold rolling treatment is not greater than 20% of the thickness of the titanium blank. The preparation method of the titanium foil has the advantages that the titanium material which is 3.8-4.2mm thick is formed into the titanium foil of which the thickness is reduced to the range of 0.01-0.05mm by virtue of pre-rolling, namely a plurality of times of cold rolling, and the relatively thick titanium material is cold-rolled so that the percentage of elongation of the titanium belt is increased to be above 36%. The percentage of elongation of the titanium foil is relatively high; when the titanium foil is used for preparing the voice diaphragm of a loudspeaker, the titanium foil is easy to form and also capable of improving the high pitch performance of the loudspeaker and reducing the diction rate of voice.

A sound device includes a housing with an accommodation space; a speaker unit located in the accommodation space and including a diaphragm for generating sound; a front cavity formed by the diaphragm and the housing; a sound channel communicated with the front cavity; and a sound-absorbing member made of sound-absorbing material located in the sound channel for covering a cross-section of the sound channel. The housing includes a bottom wall and a side wall extending from the bottom wall. The sound channel is configured to penetrate the side wall of the housing.

An electronic device that provides dynamic equalization in a directional speaker array is described. Based at least in part on audio content and an acoustic radiation pattern associated with a second electronic device, the electronic device may determine drive signals for a set of drivers. Then, the electronic device may adjust the drive signals for at least a subset of the set of drivers based at least in part on a distortion margin in at least the subset of the drivers, where the distortion margin is based at least in part on the drive signals, a distortion threshold of at least the subset of the drivers and a volume setting. Next, based at least in part on the adjusted drive signals, the electronic device may output, using the set of drivers, the sound corresponding to the audio content.

A method of processing an audio signal is provided. The method includes: acquiring an audio signal of a frequency domain for a plurality of frames; dividing a frequency band into a plurality of sections; acquiring energies of the plurality of sections; detecting an audio signal including noise based on an energy difference between the plurality of sections; and applying a suppression gain to the detected audio signal.

The invention discloses an LC sound box frequency divider. The LC sound box frequency divider includes one inductance coil L provided with at least one tap, at least one capacitor C, and at least two loudspeakers; one pole of each capacitor C is connected with one tap in the inductance coil L, and the other pole of the capacitor C is connected with one loudspeaker; and the output end of the inductance coil L is connected with another loudspeaker. The LC sound box frequency divider of the invention is composed of the inductance coil L provided with the taps, the capacitors and the loudspeakers with corresponding power; the signal input line of each loudspeaker passes through the same inductance coil L, namely, the inductance coil L is multiplexed for many times; in sound filtering, no matter how many frequency bands sound signals are divided into, input signals only pass through one inductance coil L, and the electric energy of the inductance coil L is almost fully utilized, and has no loss, the loss of power signals can be nearly avoided, and slight sound signal loss is just brought about, and sound distortion is low, and quality of reproduced sound is high.

The invention provides an FM radio multi-channel digital modulation system, relating to the technical field of radio and television. Each set of radio program of an existing FM radio is corresponding to one set of transmitting equipment, programs modulated by an exciter need a digital to analog conversion circuit, and more problems like distortion arise in conversion and modulation. The invention solves the above problem by using a technology of modulating twice and adopts a method of modulating and transmitting multiple sets of FM radio program simultaneously by using one set of circuit device. A data input interface circuit acquires a radio program transport stream from a digital signal source, the radio program transport stream is demultiplexed to obtain designated forwarded program data streams, digital decompression is performed on the designated forwarded program data streams, then a digital frequency modulation circuit and an adder circuit modulate the several sets of program to one medium frequency band, medium frequency signals of the programs are migrated to an FM radio frequency band by one single sideband modulation circuit, the medium frequency signals are amplified by one power amplification circuit, then all programs can be sent out by one antenna, thereby realizing efficient FM radio program coverage.

Disclosed is a free air magnetic circuit and speaker in which no pole piece is used. A magnet layer is located between a top plate and a back plate with a gap defined essentially in the center thereof. Into the gap, a wire coil attached to a diaphragm may be inserted. A magnet flux passes between the top and back plates. In some embodiments, the interior edge of each of the metal plates tapers toward the gap, and the magnet layer extends past the peripheral edge of each of the metal plates so as to discourage magnetic flux between the metal layers at the peripheral edge.

The invention belongs to the field of acoustoelectric technologies, and particularly relates to a speech recognition method, a noise recognition method, a sound pickup device and communication equipment. The speech recognition method comprises the following steps: S100: a bone conduction microphone collects the speaking sound of a user; S200, an air conduction microphone collects surrounding sounds; S300, a first sound source and a second sound source are both converted into electric signals, and the electric signals are transmitted to a processor; S400, the processor identifies the electric signal of the second sound source according to the electric signal of the first sound source; and the bone conduction microphone and the air conduction microphone are matched to collect sound, and thecollected sound is transmitted to the processor for processing to recognize the needed sound.

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.

The invention provides a preparation method of titanium foil, titanium foil and a titanium sound film made of the titanium foil, wherein the preparation method of the titanium foil includes the following steps: the titanium material blank is processed by the first group of cold rolling to form a thickness of 0.4-0.6mm titanium strip; the titanium strip is subjected to the second set of cold-rolling treatment to form titanium foil, wherein the first set of cold-rolling treatment includes at least two cold-rolling treatments, and the titanium blank in the first cold-rolling treatment The decrease in thickness is no more than 20% of the thickness of the titanium blank. The preparation method of the titanium foil provided by the present invention is through pre-rolling, and the titanium material with a thickness of 3.8-4.2 mm is subjected to multiple cold rolling to obtain a titanium foil whose thickness is reduced to 0.01-0.05 mm. By selecting a thicker titanium material Performing cold rolling increases the elongation of the titanium strip to more than 36%. The titanium foil has a high elongation rate, is easy to form when preparing a speaker sound film, and can also improve the high-pitch performance effect of the speaker and reduce the sound distortion rate.

The invention discloses a frequency divider of a loudspeaker box, which comprises an inductance coil L2, an inductance coil L1 provided with taps, capacitors C, and loudspeakers, wherein a circuit input end is connected with the first tap of the inductance coil L1; one pole of the capacitor C2 is connected with the left end head of the inductance coil L1; the other pole of the capacitor C2 is connected with the first loudspeakers; one pole of the capacitor C1 is connected with the second tap; the other pole of the capacitor C1 is connected with the second loudspeaker via the inductance coil L2; and an input end of the third loudspeaker is connected with the right end head of the inductance coil L1. According to the divider, signal input lines of the loudspeakers pass through the same inductance coil L, that is to say, the inductance coil L is reused for many times; during sound filtration, regardless of fractional frequency, input signals only pass through the single inductance coil L; all voltage of the inductance coil L is utilized almost without loss; a power signal has no loss; the distortion of sound is small; and recurrent sound quality is good.

The invention discloses a loudspeaker. The loudspeaker comprises a shell and an acoustic driver arranged in the shell; the shell is provided with a sound output port used for outputting a sound; part of region of the sound output port of the shell is blocked so as to lower the airflow velocity of the sound output port. According to the loudspeaker and a mobile terminal, by blocking part of region of the sound output port of the shell, the airflow velocity of the sound output port is lowered, and the problems that the sound is distorted and noise is mixed are reduced, and therefore, the loudspeaker relatively good in tone quality is provided. The invention further provides the mobile terminal.

The present invention relates to a low-inductance electromagnetic drive without driving magnetic flux circuit, which comprises a magnetic pole, a drive coil, an upper magnetic inductive board, a permanent magnet and a lower magnetic-inductive board. The magnetic pole is integrated with the lower magnetic-inductive board, and the permanent magnet is located between the upper magnetic-inductive board and lower magnetic-inductive board. The drive coil is wrapped around the magnetic pole and is movable in the axial direction. The electromagnetic drive further comprises the fastening coil, and the fastening coil is fastened to a certain proper place of the magnetic flux circuit of the drive coil. Furthermore, the fastening coil is connected with the drive coil in opposite phase. The present invention is characterized in that the drive source applies the excitation to the fastening coil in an equivalent quantity as the drive coil but in opposite phase, so that the excitation energy generated by the current flowing through the speaker for the magnetic flux circuit system is reduced to the minimum, the inductance quantity of the speaker is decreased to the minimum, and the sound distortion of the vibration system connected with the drive coil is decreased.

The present invention provides a Bluetooth headset speaker, comprising a bracket, a diaphragm, a voice coil, a washer, a magnet, a U cup, a pad, a first tuning cloth, and a second tuning cloth, wherein the first tuning cloth is fixedly connected to the one side outer wall of the bracket, the one side outer wall of the bracket corresponding to the first tuning cloth is symmetrically provided with through grooves, a through hole is opened on the one side outer wall of the bracket, the second tuning cloth is fixedly connected to one side outer wall of the through hole. Compared with the existing headset speakers, the pad designed by the present invention is internally welded and does not need to be covered with glue, which not only can effectively reduce the production process, but also improves the simplicity of the appearance of the speaker and improves the integration degree of the overall structure of the speaker. The speakers designed by the present invention are noise-reducing, through the effect of noise-reducing structure and tuning cloth, the noise in the sound is filtered out, the distortion of the sound is reduced, and the sound quality of the speaker is improved.

The invention discloses a loudspeaker box, comprising a front shell, a loudspeaker unit, a rear shell and fixing glue body. The rear shell matches the front shell to encircle a storage space for storing the loudspeaker unit. The fixing glue body comprises a body, an extension part and an abutment part. The body is stuck to the outer surface of the top wall of the front shell. A through hole and mounting holes spaced with the through hole are set on the top wall. The extension part extends from the body through the through hole to a front cavity and is spaced with the loudspeaker unit. The abutment parts extend from the body through the mounting holes to the front cavity, surround the extend part and the periphery of the loudspeaker unit and elastically abut to the loudspeaker unit. The loudspeaker box provided by the invention is compact in structure and good in shock resistance and has high fidelity. The invention also provides a processing method for the loudspeaker box. The loudspeaker box and the processing method are easy to process, compact in structure, high in reliability and good in shock resistance.

Disclosed is a free air magnetic circuit and speaker in which no pole piece is used. A magnet layer is located between a top plate and a back plate with a gap defined essentially in the center thereof. Into the gap, a wire coil attached to a diaphragm may be inserted. A magnet flux passes between the top and back plates. In some embodiments, the interior edge of each of the metal plates tapers toward the gap, and the magnet layer extends past the peripheral edge of each of the metal plates so as to discourage magnetic flux between the metal layers at the peripheral edge.