97results about How to "Improve audio performance" patented technology

A protective holder for the iPhone®, iPad®, iPod Touch™, electronic books, electronic tablet computers and other portable devices having a frontal LCD, OLED, touch screen, or other display that employs a form-fitting backplate with corner frames for cradling the device while leaving the entire frontal aspect unobstructed is disclosed. The holder may include a series of contoured side grippers on each side of the backplate for clamping the device in place without obstructing the LCD screen (or access to it for cleaning or otherwise). The holder may include a fully-adjustable kickstand for upright hands-free viewing of the device at several landscape and portrait angles and the holder may also include a built-in moveable directional sound reflector and noise shield improves audio performance, and a detachable belt clip allows belt wearing. The holder has an extreme slimline folded profile to facilitate pocket insertion, minimize bulk and create an eye-catching aesthetic.

A self-oscillating switching amplifier having an error amplifier output combined with the output of an output signal differentiator according predetermined weighing factors to force a small oscillation around the averaged output signal at a high frequency. The feedback voltage is sensed at the output of the switching amplifier. Additional feedback can be derived from a switching node of the power switch. The switching of the power switch can be dynamically changed from binary switching when the amplitude of the audio signal is low, to ternary switching when the amplitude of the input signal is high to minimize distortion of the output signal. The amplifier can be supplied with a pulsing voltage. In certain embodiments the output signal differentiator is simply a capacitor or a LC resonance circuit coupled directly to an appropriate speaker terminal for the highest possible self-oscillating frequency of the switching amplifier.

The invention discloses a loudspeaker box, which comprises an upper cover, a lower cover fixed on the upper cover and forming an accommodation space together, and a sounding unit accommodated in the accommodation space. The sounding unit and the upper cover form a front cavity by enclosing, and the sounding unit, the lower cover and the upper cover form a rear cavity by enclosing; Wherein the loudspeaker box further comprises a cover plate fixed on the side of the upper cover far away from the lower cover and an air permeable separator, wherein the cover plate and the upper cover are spaced apart to form an auxiliary sound cavity, and the auxiliary sound cavity is filled with sound-absorbing particles; The upper cover is provided with a through hole penetrating the upper cover, and the through hole communicates the rear cavity with the auxiliary sound cavity. The air permeable separator is fixed on the upper cover and completely covers the through hole, and the air permeable separatorcloses the sound-absorbing particles in the auxiliary sound cavity. Compared with the prior art, the loudspeaker box of the present invention can increase the volume of the second rear cavity for being filled the sound-absorbing particles, improve the audio performance and improve the acoustic performance.

The invention provides a loudspeaker box comprising a main cone frame, a first upper cover covered on a top end of the main cone frame and enclosed to form an accommodation space together with the main cone frame, and a sound production monomer accommodated in the accommodation space, wherein the sound production monomer and the first upper cover are enclosed to form a front cavity together, the sound production monomer and the main cone frame are enclosed to form a back cavity together, the loudspeaker box further comprises an extension part extending from the main cone frame toward a direction away from the accommodation space, a trunk bulkhead extending from the top end toward the bottom end of the main cone frame and a ventilating isolation part; a first sound absorption cavity filled with a sound production material is arranged in the extension part; the trunk bulkhead is located in the back cavity and is enclosed to form a second sound absorption cavity for accommodating the sound production material together with the main cone frame; the first sound absorption cavity communicates with the second sound absorption cavity, and the second sound absorption cavity communicates with the back cavity; and the ventilating isolation part is covered on one end of the second sound absorption cavity away from the first upper cover so as to prevent the sound production material from entering the back cavity. Compared with the prior art, the loudspeaker provided by the invention has the advantages of simple structure, and good low audio performance, and especially low frequency performance.