Abstract: A venting device is disposed within a wearable sound device or to be disposed within the wearable sound device. The venting device includes an anchor structure, a film structure and an actuator. The film structure includes an anchor end anchored on the anchor structure and a free end, and the film structure is configured to form a vent or close the vent. The actuator is disposed on the film structure. The film structure partitions a space into a first volume and a second volume, and the first volume and the second volume are connected via the vent when the vent is formed. The venting device is controlled by the controller to seal the vent when the controller determines to close the vent.

Abstract: A method, which is applied in a driving circuit including an analog-to-digital convertor (ADC) and a switching circuit including an inductor and coupled to a load, includes steps of: performing an analog-to-digital conversion on a load voltage of the load at a first rate; and producing at least a current pulse flowing through the inductor at a second rate. Wherein, each current pulse among the at least a current pulse is accomplished within a second cycle corresponding to the second rate, all of the at least a current pulse are accomplished within a first cycle corresponding to the first rate, and a first length of the first cycle is longer than twice of a second length of the second cycle.

Abstract: A manufacturing method for a device includes: providing a wafer including a first layer and a second layer; forming and patterning an actuating material formed on the wafer; patterning the first layer of the wafer to form a trench line; and removing a first part of the second layer. The first layer forms a film structure including a membrane. A slit is formed within and penetrates through the membrane because of the trench line. The film structure is actuated to form a vent temporarily because of the slit. An ear canal and an ambient of a wearable sound device are to be connected via the vent temporarily opened. The slit divides the membrane into a first membrane portion and a second membrane portion. A difference between the displacements of these two membrane portions is larger than a thickness of the membrane when the vent is formed.

Abstract: A package structure includes a first substrate and a first device disposed on the first substrate. The first device includes at least one anchor structure, a film structure anchored by the anchor structure and an actuator configured to control the film structure to form a first vent temporarily. The film structure partitions a space into a first volume to be connected to an ear canal and a second volume connected to an ambient of a wearable sound device. The ear canal and the ambient are connected via the first vent when the first vent is opened. The first vent is opened by controlling a first membrane portion and a second membrane portion of the film structure, such that a difference between a first displacement of the first membrane portion and a second displacement of the second membrane portion is larger than a thickness of the film structure.

Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.

Abstract: A sound producing device is provided. The sound producing device comprises a substrate; and a membrane pair, disposed on the substrate, comprising a first membrane and a second membrane; wherein when a driving voltage is applied on the membrane pair, the first membrane and the second membrane deform toward each other, such that air between the first membrane and the second membrane is squeezed outward and an air pulse is generated toward a direction away from the substrate.

Abstract: A linearity compensation method for a sound producing device (SPD) includes steps of: applying a test signal on a first SPD; obtaining an acoustic measurement result generated from the first SPD according to the test signal; generating a compensation curve according to the acoustic measurement result; and performing a linearity compensation operation on a second SPD according to the compensation curve.

Abstract: An acoustic transducer is configured to perform an acoustic transformation. The acoustic transducer is disposed within a wearable sound device or to be disposed within the wearable sound device. The acoustic transducer includes at least one anchor structure, a film structure and an actuator. The film structure is disposed within a first layer and anchored by the anchor structure disposed within a second layer. The actuator is disposed on the film structure, and the actuator is configured to actuate the film structure to form a vent temporarily. The film structure partitions a space into a first volume to be connected to an ear canal of a wearable sound device user and a second volume to be connected to an ambient of the wearable sound device. The ear canal and the ambient are to be connected via the vent temporarily opened when the film structure is actuated.

Abstract: A sound producing package structure configured to produce sound includes a substrate, a sound producing component and a conductive adhesive layer. The sound producing component is disposed on the substrate, and the sound producing component is configured to generate an acoustic wave corresponding to an input audio signal. The conductive adhesive layer is disposed between the substrate and the sound producing component by a surface mount technology.

Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.

Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.

Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.

Abstract: A filter is disclosed. The filter includes at least one first multiplication approximation unit, for approximating at least one first multiplication operation corresponding to at least one first coefficient with at least one first bit-wise shift operation; and at least one second multiplication approximation unit, for approximating at least one second multiplication operation corresponding to at least one second coefficient with a plurality of second bit-wise shift operations and at least one addition operation.

Abstract: An audio device includes an electroacoustic convertor and a differential amplifier. The electroacoustic convertor has a first output terminal and a second output terminal. A first polarity of a first capacitance variation corresponding to the first output terminal is opposite to a second polarity of a second capacitance variation corresponding to the second output terminal. The first capacitance variation and the second capacitance variation are associated with a magnitude of acoustic pressure. The differential amplifier has a first input terminal coupled to the first output terminal and a second input terminal coupled to the second output terminal.

Abstract: A bidirectional charging and discharging circuit is coupled between a voltage source and a capacitive load and configured to drive the capacitive load. The bidirectional charging and discharging circuit includes a first switch, comprising a first terminal coupled to the voltage source; a second switch, comprising a first terminal coupled to a second terminal of the first switch, and a second terminal coupled to a ground; an inductor, comprising a first terminal coupled to the second terminal of the first switch and the first terminal of the second switch; a third switch, comprising a first terminal coupled to a second terminal of the inductor, and a second terminal coupled to a first terminal of the capacitive load; and a fourth switch, comprising a first terminal coupled to the second terminal of the inductor and the first terminal of the third switch, and a second terminal coupled to a ground.

Abstract: An acoustic transducer is disposed within a wearable sound device or to be disposed within the wearable sound device. The acoustic transducer includes a first anchor structure and a first flap. The first flap includes a first end and a second end. The first end is anchored by the first anchor structure, and the second end is configured to perform a first up-and-down movement to form a vent temporarily. The first flap partitions a space into a first volume to be connected to an ear canal and a second volume to be connected to an ambient of the wearable sound device. The ear canal and the ambient are connected via the vent temporarily opened.

Abstract: A crossover circuit, disposed within a sound producing device including a first sound producing cell driven by a first driving signal and a second sound producing cell driven by a second driving signal, includes a first filter receiving an input signal at an input terminal of the first filter, a first subtraction circuit, and a second filter coupled between the output terminal of the first filter and the second input terminal of the first subtraction circuit. A first input terminal of the first subtraction circuit is coupled to the input terminal of the first filter; a second input terminal of the first subtraction circuit is coupled to an output terminal of the first filter. The crossover circuit produces the first driving signal and the second driving signal according to a first output signal of the first subtraction circuit and a second output signal of the first filter respectively.

Abstract: A signal density modulation (SDM) encoder includes a first subtractor, a sigma circuit and a multi-bit quantizer. The first subtractor is used for receiving an input signal. The sigma circuit is coupled to the first subtractor. The multi-bit quantizer, coupled to the first subtractor and the sigma circuit, is configured to generate an output signal. The sigma circuit or the multi-bit quantizer produces a first feedback signal to the first subtractor. The first subtractor performs a subtraction operation according to the first feedback signal and the input signal, and generates a delta signal. The sigma circuit performs an operation on the delta signal, such that the SDM encoder has a noise transfer function having a high pass filtering effect. The noise transfer function is a ratio of a quantization error brought by the multi-bit quantizer with respect to the input signal. The output signal has more than two levels.

Abstract: A driving circuit is disclosed. The driving circuit includes a charging circuit, coupled between a voltage source and a load, configured to form a first current from the voltage source to the load; and a discharging circuit, coupled between the voltage source and the load, configured to form a second current from the load back to the voltage source.

Abstract: A filter is disclosed. The filter includes at least one first multiplication approximation unit, for approximating at least one first multiplication operation corresponding to at least one first coefficient with at least one first bit-wise shift operation; and at least one second multiplication approximation unit, for approximating at least one second multiplication operation corresponding to at least one second coefficient with a plurality of second bit-wise shift operations and at least one addition operation.