Aspects of the present disclosure provide methods, apparatuses, and systems for closed-loop sleep protection and/or sleep regulation. According to an aspect, sleep disturbing noises are predicted and a biosignal parameter is measured to dynamically mask predicted disturbing environmental noises in the sleeping environment with active attenuation. Environmental noises in a sleeping environment of a subject are detected, input, or predicted based on historical data of the sleeping environment collected over a period of time. The biosignal parameter is used to determine sleep physiology of a subject. Based on the environmental noises in the sleeping environment and the determined sleep physiology, the noises are predicted to be disturbing or non-disturbing noises. For predicted disturbing noises, one or more actions are taken to regulate sleep and avoid sleep disruption by using sound masking prior to or concurrently with the occurrence of the predicted disturbing noises.

Provided is an acoustic reproduction apparatus, including a first microphone to be used for noise cancellation processing using a feedback scheme, a second microphone including a sound collection surface in a direction different from a direction of a sound collection surface of the first microphone and to be used for noise cancellation processing using the feedback scheme, and an acoustic signal processing unit configured to generate a noise-cancelling signal using a first sound collection signal collected by the first microphone and a second sound collection signal collected by the second microphone.

The present disclosure provides an acoustic output apparatus including one or more status sensors, at least one low-frequency acoustic driver, at least one high-frequency acoustic driver, at least two first sound guiding holes, and at least two second sound guiding holes. The status sensors may detect status information of a user. The low-frequency acoustic driver may generate at least one first sound, a frequency of which is within a first frequency range. The high-frequency acoustic driver may generate at least one second sound, a frequency of which is within a second frequency range including at least one frequency exceeding the first frequency range. The first and second sound guiding holes may output the first and second spatial sound, respectively. The first and second sound may be generated based on the status information, and may simulate a target sound coming from at least one virtual direction with respect to the user.

A speaker system uses destructive wave interference to generate “dead spots” with respect to an audio presentation. The signal for the dead spot generating device can be an inverted signal generated using the audio signal. In one embodiment, the inverted signal is generated using the audio signal, an indication of loudness at one or more active speakers, and a determination of the characteristics of the sound path from the one or more active speakers (including delay and attenuation).

Systems and methods for communicating information related to a wearable device are disclosed. Exemplary information includes audio information.

There are described headphones comprising earcups to be placed about ears of a user, with a headband linking the earcups and to be extending above a head of the user. A flexible band distinct from the headband is secured below the headband for contact with the head of the user. Removable headband sensors are embedded in the flexible band and have a portion thereof protruding downwardly from the flexible band to reach the scalp. The flexible band has a flexibility which makes the flexible band deform under the weight of the earcups to conform with the head of the user to ensure high quality contact between the headband electrodes and the scalp. There are further provided earcup electrodes on the earcups for contact with a region on or behind an ear of the user. Signals from the electrodes can be used for different purposes such as concentration monitoring and feedback.

A device includes an electromagnetic radiation delivery system such as a laser of light emitting diode infrared emitter configured for delivery of electromagnetic radiation within a sealed canal such as an ear canal, a fiber optic cable configured for delivering or capturing the electromagnetic radiation within the sealed canal, and a photo detector coupled to the fiber optic cable forming a portion of a voice communication system. Other embodiments are disclosed.

A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.

The present disclosure relates to an acoustic output apparatus. The acoustic output apparatus comprising: at least one low-frequency acoustic driver that outputs sound from at least two first sound guiding holes; at least one high-frequency acoustic driver that outputs sound from at least two second sound guiding holes; and a controller configured to cause the low-frequency acoustic driver to output sound in a first frequency range, and cause the high-frequency acoustic driver to output sound in a second frequency range, wherein the second frequency range includes frequencies higher than the first frequency range.

A micro-electro mechanical device includes a casing, a vibration sensor, a vibration membrane assembly, and a micro-electro mechanical microphone. The casing has a sound-receiving hole, and the vibration sensor is disposed in the casing. The vibration membrane assembly is disposed in the casing and corresponds to the vibration sensor. The micro-electro mechanical microphone is disposed in the casing and corresponds to the sound-receiving hole, and a back cavity of the micro-electro mechanical microphone is formed in the casing. The back cavity at least partially overlaps with areas corresponding to a vertical projection of the vibration membrane assembly.