Embodiments disclosed herein include headphone devices with spatially diverse antennas employing multiple operational modes and antenna switching policies. The headphone device may identify a current mode of operation and wirelessly communicate with at least one external device based at least in part on the current mode of operation. Further, operating in a first mode of operation, the headphone device may cause switching circuitry to selectively couple a first antenna to the common port in accordance with a first antenna switching policy. While operating in the second mode of operation, the headphone device may cause circuitry to selectively couple a second antenna to the common port in accordance with a second antenna switching policy that is different from the first antenna switching policy.

A speaker outputting sound from a speaker portion arranged facing upward. The speaker is provided with: a first head portion including the speaker portion; a first base portion; a transparent first housing arranged between the first head portion and the first base portion; at least one LED unit arranged inside the first housing; and a control portion for driving LED elements of the LED unit on the basis of a sound signal from the outside. Each LED unit is provided with: a second head portion; a second base portion; and a transparent second housing arranged between the second head portion and the second base portion. As a result, light linked to the sound, emitted from the LED elements of the LED units, can be efficiently delivered to the eye of the user.

In one example embodiment, a device mounting system is provided for in-wall and/or in-ceiling use in residential and commercial structures, suitable for both retro-fit and new construction applications. The system includes a mounting ring and a device can. The mounting ring is installed directly into a hole cut at a selected location in the wall or ceiling or into a pre-construction bracket arranged in the wall or ceiling. The device can is later inserted into the mounting ring and retained therein by a combination of a number of magnets that are attracted to a mounting ring flange and a number of spring clips that engage an inner face of a mounting ring body.

According to an embodiment of the present invention, an electronic device may comprise: a housing; a printed circuit board disposed inside the housing, the printed circuit board comprising a first surface, a second surface facing away from the first surface, and a first through-hole and a second through-hole penetrating the first surface and the second surface; a first microphone disposed on the second surface so as to at least partially overlap the first through-hole when seen from above the first surface; a second microphone disposed on the second surface so as to at least partially overlap the second through-hole when seen from above the first surface; a support member disposed on the first surface, the support member comprising a third surface facing the first surface, a fourth surface facing away from the third surface, a third through-hole at least partially overlapping the first through-hole when seen from above the first surface, and a fourth through-hole at least partially overlapping the second through-hole when seen from above the first surface; a first sound-transmitting member disposed on the fourth surface so as to at least partially overlap the third through-hole; and a second sound-transmitting member disposed on the fourth surface so as to at least partially overlap the fourth through-hole. Various other embodiments may be included.

A terminal protective case and an audio playback system, the case including a housing, a diaphragm, a piezoelectric sheet, and a drive circuit. The housing has a main body part and a fastening frame part, a side of the fastening frame part is fastened to a periphery of the main body part, the fastening frame part and the main body part jointly enclose an accommodating groove configured to accommodate a terminal. The diaphragm is within the main body part, the piezoelectric sheet is fastened to the diaphragm, a front cavity is on a side of the diaphragm, a sound outlet hole is disposed on the main body part, and the sound outlet hole connects the front cavity to the outside of the main body part. The drive circuit is within the main body part and connected to the piezoelectric sheet, and is configured to drive the piezoelectric sheet.

The present disclosure provides a limiter system. The limiter system includes a first equalization filter, a low-pass filter, a first limiter, a high-pass filter, a second limiter, and a mixer. The limiter system provided by the present disclosure further includes a second equalization filter. An audio signal from a signal source first passes through the first equalization filter, the signal equalized for the first time is divided into two signals, one signal is processed by the low-pass filter and the first limiter, the other signal is processed by the high-pass filter and the second limiter, and then the two processed signals enter the mixer to be mixed and outputted. The mixed output signal is subjected to second equalization filtering by the second equalization filter to avoid clipping distortion or to obtain a higher maximum sound level.

A limiter system for an active speaker may include at least one lowpass filter configured to receive an input signal and output a signal lower than a crossover frequency, at least one highpass filter, configured to receive an input signal and output a signal higher than the crossover frequency, a first allpass filter configured to adjust the phase of the signal lower than the crossover frequency, a second allpass filter configured to adjust the phase of the signal higher than the crossover frequency, a first limiter, configured to receive and limit the signal from the first allpass filter, a second limiter, configured to receive and limit the signal from the second allpass filter, and a mixer, configured to mix the signal lower from the first limiter and the signal from the second limiter.

An amplifier and an electronic device using the same are provided. The amplifier includes a first speaker, a second speaker, an acoustic box and at least one partition. The first speaker and the second speaker are disposed on a continuous surface inside the acoustic box. The partition is disposed on the continuous surface and interposed between the first speaker and the second speaker.

An electronic furniture assembly of the present invention includes: (i) a furniture assembly comprising: (A) a base (e.g., a seat portion), (B) at least one transverse or upright member (e.g., a side, armrest or backrest), and (ii) a speaker system mounted within one or more portions of the furniture assembly. A method of tuning a speaker of an audio-enhanced furniture system includes presenting a user with predetermined tuning profiles corresponding to a plurality of configuration footprint shapes in which the furniture assembly can be assembled and in response to a user selection of a given configuration footprint shape, tuning the speaker system according to the tuning profile selected by the user.

An audio-enhanced furniture system comprises: a furniture assembly having a partially acoustically transparent material, such as an upholstery fabric or a perforated, rigid structure that is perforated in order to be more acoustically transparent; and a speaker system positioned within the furniture assembly, the speaker system including a speaker covered by the partially acoustically transparent material. The speaker is configured to be tuned to compensate for sound being emitted from the speaker through the perforated partially acoustically transparent material.