The audio amplification system comprises a power supply (100) connected to a feedback circuit (107), which is connected to the amplifier output filter, so that the power supply voltage (100) dynamically adjusts to the amplifier output voltage. Connected to the power supply (100) and mosfets (102) is a capacitor (108) with the function of stabilizing the power supply voltage (100). The system also comprises a control circuit (106), in which the mosfets (102) are connected, which connect to the output filter through an inductor (103) and a capacitor (104). The amplifier output (101) involves a speaker (105).

A digital microphone or other sensor assembly includes a transducer and an electrical circuit including a slew-rate controlled output buffer configured to reduce propagation delay and maintain output rise and fall time independent of PVT variation and load capacitance. In some embodiments, the portions of the output buffer are selectably disabled to reduce power consumption without adversely substantially increasing propagation delay.

An apparatus comprising: an audio signal analyzer configured to analyze at least one audio signal to determine at least one audio component with an associated orientation parameter; a reference definer configured to define at least one of: a reference orientation for an apparatus; and a reference position for the apparatus; a directional determiner configured to determine a direction value based on the reference orientation/position for the apparatus and at least one of: an orientation of the apparatus; a position of the apparatus; an orientation of a further apparatus co-operating with the apparatus; and a position of the further apparatus; and a directional processor configured to process at least one associated directional parameter for the at least one audio component dependent on the direction value.

Various aspects include audio devices with a capacitive sensing interface along a compound curved wall. Some aspects of the disclosure relate to wearable audio devices with a capacitive sensing interface and a flexible printed circuit board (PCB) for detecting a touch command at the interface. In certain cases, the flexible PCB has at least one slit for conforming to the compound curve of the wall. In additional implementations, the inner surface of the wall is faceted and the flexible PCB conforms to the facets in the wall.

A powered rough-in assembly is disclosed. The powered rough-in assembly includes a mounting frame that is annular, having an inner perimeter sized and shaped to receive a speaker module, and an outer perimeter having a polygonal shape with a plurality of edges. The powered rough-in assembly also includes a wiring block coupled to a first edge of the mounting frame. The wiring block includes two spring-type terminals and two wires, each terminal communicatively coupled to a first end of a different wire of the two wires. The plurality of edges includes at least one edge that is a flange having a plurality of countersunk holes. The plurality of edges also includes at least two edges releasably coupled to metal wings.

Various aspects include audio devices with a capacitive sensing interface along a compound curved wall. Some aspects of the disclosure relate to wearable audio devices with a capacitive sensing interface and a flexible printed circuit board (PCB) for detecting a touch command at the interface. In certain cases, the flexible PCB has at least one slit for conforming to the compound curve of the wall. In additional implementations, the inner surface of the wall is faceted and the flexible PCB conforms to the facets in the wall.

The present disclosure relates to a system for providing an acknowledgement output at an output transducer of a device in response to detection of a trigger signal. The system includes an input transducer, a signal processor, a main processor separate from the signal processor and an output driver. The signal processor monitors an input signal received at the signal processor from the input transducer and outputs an acknowledgement signal to the output driver if the received input signal corresponds to the trigger signal. The signal processor also outputs an interrupt signal to the main processor to cause the main processor to enter an active state. In this way an acknowledgement output can rapidly be provided to a user of the system, as there is no need to wait until the main processor has entered its active state and processed the trigger signal.

A sound reproducing apparatus and a sound reproducing method are provided. The apparatus includes a noise assessment unit configured to assess an intensity of ambient sound, a processor that determines an omnidirectional audio output level based on the intensity of ambient sound, an omnidirectional speaker configured to reproduce a desired sound at the omnidirectional audio output level, and a directional speaker configured to reproduce the desired sound simultaneously with the omnidirectional speaker. The method includes the steps of assessing an intensity of ambient sound, determining an omnidirectional audio output level based on the intensity of ambient sound, and reproducing a desired sound simultaneously from an omnidirectional speaker and a directional speaker. The omnidirectional speaker is controlled to reproduce the desired sound at the omnidirectional audio output level.

A speaker mounting system having a driver housing and a plurality of clamping assemblies is disclosed. The driver housing includes a face surrounded by a flange, a driver and a central axis. The clamping assemblies are coupled to the driver housing, each including an enclosure, a dog ear, an actuator, and a biasing element. Each dog ear has a core, a threading, and an arm, is rotatably coupled to the enclosure along a first axis, and slideable along a path. Each actuator has a body and a threading, and is rotatably coupled to the enclosure along a second axis. Each biasing element biases the dog ear towards the face. Each clamping assembly is movable between a hidden configuration, an extended configuration, and a tightened configuration. The speaker mounting system may also include a powered rough-in assembly having a mounting frame and a wiring block with two terminals and two wires.

A failure determination device allows a user to define conditions indicating a failure of the device. The failure determination device includes a difference detector configured to output a difference detection signal that indicates a difference between an input signal and an output signal output from a processor that performs a prescribed process on the input signal and a determination unit configured to output a determination signal indicating a determination result on presence or absence of a failure in the processor, based on the difference detection signal. A level detector outputs a level detection signal indicating whether a level of the input signal is within a prescribed range. The determination unit updates the determination signal when the level detection signal indicates that the level of the input signal is within the prescribed range, and stops updating the determination signal when the level detection signal indicates that the level of the input signal is not within the prescribed range.