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.

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 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 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.