Harman International Industries

There is provided an electrical circuit that can serve as a building block for an impedance converter amplifier, particularly advantageous for use in a condenser microphone. The circuit topology comprises: a pair of transistors comprising a first transistor and a second transistor, wherein a first terminal of the first transistor is configured to connect to a first terminal of a third transistor and a first terminal of the second transistor is configured to connect to a first terminal of the fourth transistor, wherein the third and fourth transistors form a differential input pair, wherein a second terminal of the first transistor is connected to a second terminal of the second transistor; a first current source for providing a constant current stream, wherein the first current source is connected to the second terminal of the first transistor and the second terminal of the second transistor; a voltage follower, wherein an output terminal of the voltage follower is connected to the constant current stream, wherein a second terminal of the voltage follower is connected to a second terminal of the third transistor and a second terminal of the fourth transistor; and a voltage source for providing a voltage drop in the constant current stream, wherein the voltage source is connected between the output terminal of the voltage follower and the second terminals of the first and second transistors.

A network configuration method performed by a user device and a network configuration method performed by a speaker device are provided. In this method, a Wi-Fi Direct connection is used for direct communication between speaker devices to form a Wi-Fi Direct group composed of all speaker devices, and a first speaker device is configured in the Wi-Fi Direct group as a group owner (GO) device to perform direct communication with the user device, where the direct communication employs a Bluetooth connection. Based on such a system design, the user device transmits network configuration information via the GO speaker device to other speaker devices for which network setup needs to be performed, for the other speaker devices to connect to a Wi-Fi network based on the network configuration information, thereby implementing a network configuration process for a plurality of speaker devices. The method can significantly improve the speaker network configuration efficiency, while the speaker devices further enjoy the convenience of joining or leaving the Wi-Fi Direct network at any time.

An on-wall speaker system includes a body, a first pair of transducers, and a high frequency actuator element. The body includes a plurality of side walls and a front wall. The first pair of transducers are supported by first opposing side walls of the plurality of side walls. The high frequency actuator element is mounted to the front wall of the body and is configured to induce mechanical vibrations in the front wall to generate high frequency sound waves to a listening environment.

The present disclosure provides a light source control method, a light-emitting assembly, an audio device, and a computer-readable storage medium. The light source control method includes: acquiring light-emitting pattern data for controlling light-emitting characteristics of a light source array, the light source array including a plurality of light sources; measuring a temperature of the light source array in real time using a temperature sensor; determining, based on the light-emitting pattern data and the temperature of the light source array, to adjust the light source array from a first average brightness level to a second average brightness level; and controlling light-emitting characteristics of each light source in the light source array non-proportionally based on the second average brightness level and the light-emitting pattern data, such that the light source array displays a light-emitting pattern corresponding to the light-emitting pattern data while satisfying the second average brightness level.

The present disclosure relates to a loudspeaker assembly (100), characterized in that the loudspeaker assembly (100) comprises: a magnetic circuit unit (30) comprising a top plate (36) and defining a magnetic gap (38); a frame unit (20) connected to the magnetic circuit unit (30); and a vibration unit (10) connected to the frame unit (20) and comprising an upper diaphragm (12), a voice coil (14), and a dome (16), the voice coil (14) extending at least partially into the magnetic gap (38), wherein the dome (16) comprises a dome main body (160) and at least two crimped edge portions (162, 164) surrounding the dome main body (160), wherein the dome (16) is affixed to a top side of the voice coil (14) by means of the crimped edge portions (162, 164), such that the top plate (36) of the magnetic circuit unit (30) is disposed in a middle of the voice coil (14) in a height direction (z).

In at least one embodiment, a feedback amplifier is provided. The amplifier includes an input stage circuit (206) and a collector element (208). The input stage circuit (206) is configured to receive at least one input feedback signal having wide band frequency components that include high frequency components and low frequency components. The input stage circuit (206) includes a first gain stage (220), a filter, and a second gain stage (222). The first gain stage (220) amplifies the at least one input feedback signal to generate at least one amplified output signal. The filter filters the wide band frequency components on the at least one input feedback signal to generate at least one filtered feedback signal having a first low frequency component. The second gain stage (222) amplifies the at least one filtered feedback signal having the first low frequency component and to provide at least one gain output signal.

Provided are a device for generating a star-sparkling lighting effect and a method thereof. The method includes arranging at least one multi-color light source (110) to emit multiple lights (112, 114, 116) of at least two colors, and arranging at least one light-guiding lens (130) in front of the multi-color light source, such that the multiple lights are mixed into mixed-color lights in a diffuse lens portion (150) of the light-guiding lens, and then the mixed-color lights are divergently emitted to a front grille panel (140) via a reflective lens portion (160), and through gaps in the front grille panel, a star-sparkling lighting effect is generated.

A shield assembly arranged around an acoustic sensor may include an outer shell extending from an outer apex to a base and forming a dome-shape, the outer shell defining at least one perforation to allow air to flow therethrough, and an inner shell extending from an inner apex to the base inside of the outer shell, the inner shell creating a channel between the outer shell, inner shell, and base to receive airflow at the at least one perforation, wherein the at least one perforation and channel redirect air to protect a microphone arranged within the inner shell from external airflow and preserving sound pressure measurement integrity.

A loudspeaker includes a speaker enclosure, first and second speaker drivers housed within the speaker enclosure, and first and second acoustic transmission lines housed within the speaker enclosure. The first and second acoustic transmission lines are respectively associated with the first and second speaker drivers and are a conjoined pair of acoustic transmission lines. The loudspeaker may be arranged within a structure of an assembly. The assembly may be a vehicle seat with the structure being a head rest or an upper portion of the vehicle seat.

A data processing method and a control device are provided. The method of the present disclosure is directed to a loudspeaker system including a plurality of loudspeakers. By collecting locally measured distance information from respective loudspeakers and determining a real-time spatial layout of the loudspeaker system based on the distance information, automatic layout calibration of the loudspeaker system is achieved. Subsequently, according to the layout of the loudspeaker system, and in combination with an actual orientation of a user and spatial position-related data indicative of a position of a sound source in audio content to be played, corresponding data in the audio content is assigned to corresponding loudspeakers, thereby utilizing playback by the respective loudspeakers to collectively achieve spatial audio rendering, providing an immersive sound experience for the user. The method of the present disclosure does not require additional layout calibration processing, and thus can achieve real-time layout determination without user awareness and can automatically adjust audio playback of the loudspeakers according to changes in the real-time orientation of the user, thereby achieving user orientation-adaptive spatial audio rendering.