Disclosed in the present disclosure are a wireless playback device, a playback control method thereof, and a head-mounted wireless headset system. The device includes: a housing, a headband detection device, a processor, a power amplifier (PA) operational amplification device, and a speaker. The headband detection device collects connection condition data of a headband device and the housing. The processor is connected to the headband detection device and controls the PA operational amplification device to adjust an operation power mode of the speaker according to the connection condition data. The PA operational amplification device is connected to the processor and the speaker, respectively, and adjusts the operation power mode of the speaker according to control of the processor. Therefore, the function automatically switching the headphone function and a small speaker function is realized, and the user experience is improved.

Accordingly the embodiments herein provide a method for fabricating a neuron oscillator (200a). The neuron oscillator (200a) includes a thermal insulating device connected with a resistor and a capacitor in series to produce self-sustained oscillations, where the resistor and the capacitor are arranged in parallel manner. The neuron oscillator (200a) eliminates a requirement of an additional compensation circuitry for a consistent performance over a time under heating issues. Additionally, an ON/OFF ratio of the neuron oscillator (200a) improves to a broader resistor range. Further, a presence of tunable synaptic memristor functionality of the neuron oscillator (200a) provides a reduced fabrication complexity to a large scale ONN. An input voltage required for the neuron oscillator (200a) is low (2-3 V) which makes it suitable to use with existing circuitries without using any additional converters. Additionally, an amplitude of the oscillations is a significant fraction of an applied bias which eliminates a need for an amplification.

Accordingly the embodiments herein provide a method for fabricating a neuron oscillator (200a). The neuron oscillator (200a) includes a thermal insulating device connected with a resistor and a capacitor in series to produce self-sustained oscillations, where the resistor and the capacitor are arranged in parallel manner. The neuron oscillator (200a) eliminates a requirement of an additional compensation circuitry for a consistent performance over a time under heating issues. Additionally, an ON/OFF ratio of the neuron oscillator (200a) improves to a broader resistor range. Further, a presence of tunable synaptic memristor functionality of the neuron oscillator (200a) provides a reduced fabrication complexity to a large scale ONN. An input voltage required for the neuron oscillator (200a) is low (2-3 V) which makes it suitable to use with existing circuitries without using any additional converters. Additionally, an amplitude of the oscillations is a significant fraction of an applied bias which eliminates a need for an amplification.

A sound producing device includes a first sound producing cell, driven by a first driving signal and configured to produce a first acoustic sound on a first audio band, and a second sound producing cell, driven by a second driving signal and configured to produce a second acoustic sound on a second audio band different from the first audio band. A first membrane of the first sound producing cell and a second membrane of the second sound producing cell are Micro Electro Mechanical System fabricated membranes. The first audio band is upper bounded by a first maximum frequency; the second audio band is upper bounded by a second maximum frequency. A first resonance frequency of the first membrane is higher than the first maximum frequency of the first driving signal. A second resonance frequency of the second membrane is higher than the second maximum frequency of the second driving signal.

A method of determining an audio controller for a headphone that is configured to use an acoustic transducer to develop sound that is delivered to an ear of a user and that includes a feedback microphone that is configured to sense sound developed by the acoustic transducer, and a related computer program product and system. A first audio transfer function between the acoustic transducer and the feedback microphone is measured. A second audio transfer function between the acoustic transducer and the feedback microphone with a feedback controller applied is determined. The audio controller is calculated based on both the first audio transfer function and the second audio transfer function.

A random code generator includes a power source, a sensing circuit, a first memory cell and a second memory cell. A first terminal of the first memory cell is connected with the power source. A second terminal of the first memory cell is connected with the sensing circuit. A first terminal of the second memory cell is connected with the power source. A second terminal of the second memory cell is connected with the sensing circuit. The power source provides a supplying voltage to both the first memory cell and the second memory cell during an enrollment. A random code is then determined according to the resistance difference between the first memory cell and the second memory cell after the enrollment.

A random code generator includes a power source, a sensing circuit, a first memory cell and a second memory cell. A first terminal of the first memory cell is connected with the power source. A second terminal of the first memory cell is connected with the sensing circuit. A first terminal of the second memory cell is connected with the power source. A second terminal of the second memory cell is connected with the sensing circuit. The power source provides a supplying voltage to both the first memory cell and the second memory cell during an enrollment. A random code is then determined according to the resistance difference between the first memory cell and the second memory cell after the enrollment.

A method of determining an audio controller for a headphone that is configured to use an acoustic transducer to develop sound that is delivered to an ear of a user and that includes a feedback microphone that is configured to sense sound developed by the acoustic transducer, and a related computer program product and system. A first audio transfer function between the acoustic transducer and the feedback microphone is measured. A second audio transfer function between the acoustic transducer and the feedback microphone with a feedback controller applied is determined. The audio controller is calculated based on both the first audio transfer function and the second audio transfer function.

According to examples, an apparatus may include a chamber having a hole and a microphone unit. The microphone unit may include a first substrate having a first opening aligned with the hole of the chamber, a second substrate positioned with respect to the first substrate to form a gap between the second substrate and the first substrate, the second substrate having a second opening, and a diaphragm housed within the gap formed between the first substrate and the second substrate, in which the first opening is positioned on a first side of the diaphragm and the second opening is positioned on a second side of the diaphragm.

An active noise source apparatus includes a pair of a first and second switched-biased noise amplifier branches (22, 23). A directional coupler (24) having a pair of input ports (3, 4) connected to combine the noise outputs from the first and second switched-biased noise amplifiers. One output port (4) of the directional coupler (24) is connected to a matched termination (Rtermination) and another output port (2) of the directional coupler (24) is connected to an output (25) of the active noise source.