A car charging device includes a main body, a charging interface, an input terminal, a conversion circuit, a microphone, a loudspeaker, and a noise reduction circuit. A main body includes an insertion portion and the top. The charging interface includes a charging terminal. The input terminal is located at the insertion portion. The conversion circuit is electrically connected to the input terminal and the charging terminal and configured to convert electric power. The microphone is located on the top and configured to convert a sound into an input audio. The loudspeaker is located on the top. The noise reduction circuit is configured to generate a noise reduction audio according to the input audio, and drive, by using the noise reduction audio, the loudspeaker to emit a noise reduction sound, where the noise reduction audio is an inversion of a regular audio continuing for a preset time in the input audio.

Embodiments provide a compensator for a loudspeaker system having a first loudspeaker group having at least one sound transducer, the first loudspeaker group being configured to generate a first sound signal based on an audio signal, the sound signal having a useful signal portion and a distortion signal portion. The compensator has a second loudspeaker group having at least one sound transducer, the second loudspeaker group being configured to generate a second sound signal based on a compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal.

Acoustic lens includes a plurality of fins arranged at a predetermined interval. At least one fin among the plurality of fins includes: first notch portion provided on a front side of a path of a sound; and second notch portion provided on a rear side of the path of the sound. Second notch portion has a shape corresponding to a shape of a diaphragm of a speaker disposed in proximity to the fin.

Systems and methods for noise cancelation in a listening area include functionality that activates a microphone of the remote control device of a home entertainment system or a microphone of another mobile device to collect a baseline white noise profile of a user's media content listening area, such as the user's family room, living room or other TV viewing space. This baseline white noise profile may be used by the user's set-top box (STB) or other receiving device to generate the corresponding noise canceling audio signal to create a noise-canceling effect and a more immersive and enjoyable listening experience for the user. A plurality of audio data samples from which to select, each representing a different baseline profile of ambient white noise associated with the media content listening area, may be generated and used for different devices that generate white noise.

An aircraft cabin system includes a plurality of modular displays disposed in an cabin and a server connected to each of the modular displays. Each of the plurality of modular displays includes a microphone that captures ambient noise in the cabin and a speaker that emits a noise reduction sound. The server instructs each of the plurality of modular displays to capture the ambient noise during a preselected flight phase. The server receives, from each of the plurality of modular displays, a digital ambient noise signal generated based on the ambient noise. The server generates for each of the plurality of modular displays a digital ambient noise reduction signal with an inverted phase of the digital ambient noise signal and a dynamic amplitude that is calculated to yield a highest level of ambient noise reduction. The server sends the digital ambient noise reduction signal to each of the plurality of modular displays. The speaker emits an ambient noise reduction sound with an inverted phase and a dynamic amplitude based on the digital ambient noise reduction signal.

Provided are methods and apparatus for enhancing a signal-to-noise ratio. In an example, provided is an apparatus configured to modify audio to better match the way the human brain processes audio by modifying the audio to a form which takes advantage of human echolocation capabilities. When humans listen to audio, they subconsciously listen for an echo and thus subconsciously focus on listening to, and for, meaningful information in audio. The focus causes humans to ignore noise in the audio, which results in enhancing a signal-to-noise ratio. In an example, the provided apparatus compensates for shortcomings of a device to which the apparatus is coupled by adjusting a respective amplitude of at least one constituent audio frequency of an output digital audio stream of the apparatus.

Systems and methods for audio listening devices, comprise a speaker coupled to a first housing, a sound port having a first end and a second end, wherein the first end is coupled to the first housing, and the second end is configured to be inserted in an ear canal of a person such that sound waves emitted from the speaker propagates via a secondary path to the ear canal through the sound port, active noise cancellation (ANC) components configured to generate anti-noise signals through the micro-speakers to cancel external noise, and a first microphone disposed within the sound port at the second end of the sound port such that the first microphone is configured to detect the anti-noise signal that propagates through the sound port via the secondary path and the external noise that propagates via a primary path.

Acoustic lens includes a plurality of fins arranged at a predetermined interval. At least one fin among the plurality of fins includes: first notch portion provided on a front side of a path of a sound; and second notch portion provided on a rear side of the path of the sound. Second notch portion has a shape corresponding to a shape of a diaphragm of a speaker disposed in proximity to the fin.

Provided is a filter circuit for producing a noise reduction signal for reducing a noise signal collected by a microphone, including: a digital section including an analog/digital conversion section configured to convert the noise signal into a digital noise signal, a digital filter section configured to produce a digital noise reduction signal based on the digital noise signal, and a digital/analog conversion section configured to convert the digital noise reduction signal into an analog noise reduction signal; an analog path connected in parallel to said digital section and configured to output the noise signal as it is or after processed by an analog filter; and a synthesis section configured to synthesize the analog noise reduction signal outputted from said digital/analog conversion section of said digital section and the analog signal outputted from said analog path to produce a noise reduction signal to be used for noise reduction.

Embodiments provide a compensator for a loudspeaker system having a first loudspeaker group having at least one sound transducer, the first loudspeaker group being configured to generate a first sound signal based on an audio signal, the sound signal having a useful signal portion and a distortion signal portion. The compensator has a second loudspeaker group having at least one sound transducer, the second loudspeaker group being configured to generate a second sound signal based on a compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal.