An active noise cancellation device having an acoustic filter includes: a casing, an active noise cancellation unit, a speaker, a noise cancellation processor and an acoustic filter. The casing includes a first channel and a second channel, wherein a channel length of the first channel is greater than a channel length of the second channel. The active noise cancellation unit includes an external microphone disposed outside the casing. The active noise cancellation is configured to detect an ambient noise, wherein a location of the external microphone corresponds to a location of the first external end of the first channel. The speaker is disposed at a second external end of the second channel, and is configured to output a phase-inverted signal of the ambient noise. The noise cancellation processor electrically couples with the external microphone and the speaker. The acoustic filter is disposed inside the first channel.

A noise reducing device includes: an acoustic-to-electric conversion section for collecting noise and outputting an analog noise signal; an analog-to-digital conversion section for converting the analog noise signal into a digital noise signal; and a digital processing section for generating a digital noise reducing signal on a basis of the digital noise signal and a desired parameter. The device further includes: a retaining section for retaining a plurality of parameters corresponding to a plurality of kinds of noise characteristics; a setting section for setting one of the plurality of parameters as the desired parameter of the digital processing section; a digital-to-analog conversion section for converting the digital noise reducing signal into an analog noise reducing signal; and an electric-to-acoustic conversion section for outputting noise reducing sound on a basis of the analog noise reducing signal.

A directional noise-cancelling and sound detection system and method for sound targeted hearing and imaging is donned on the ears. The system provides a microphone array that selectively focuses on audio signals from at least one sound source to enable selective listening to the audio signal and directional noise cancelling, including actively reducing background sounds. The system provides an image capturing device that works in tandem with the microphone array to generate images of, and enable viewing of, the sound source. The system also allows the audio signal and the image to be captured from a 360 range relative to the earpiece. A processor operatively connects to the microphone array and the image capturing device to analyze the audio signal and the image for selectively listening, restricting, and adjusting the intensity of sound. A digital display control unit regulates selection, intensity, and restriction of sound transmitted through the earpiece.

An active noise cancellation system for reducing unwanted noise in a target area by attenuating a disturbance noise signal (d(n)), which is the remaining noise in the target area originated from an ambient noise signal (x(n)) present in the vicinity of the target area that is transferred to the target area via a main path described by a transfer function P(z)), the active noise cancellation system including a processing unit that implements an ANC-controller which is configured to provide a control signal (y(n)) for controlling a speaker in the target area in order to generate an acoustic signal (y(n)) that destructively overlaps with the disturbance noise signal (d(n)) and thereby attenuates the same.

A vehicle having a plurality of electronic components includes: a communicator configured to receive communicated signals from the plurality of electronic components, at least one electronic component of the plurality of electronic components outputting noise; a storage configured to store noise-related information of the plurality of electronic components; a speaker configured to output sound; and a controller configured to produce an antiphased sound signal to the noise output from the at least one electronic component based on the noise-related information stored in the storage when the at least one electronic component is operating, and control the speaker to output a sound corresponding to the antiphased sound signal.

A method of automated feedforward filter design comprising designing a feedforward filter for a system implementing active noise cancelling is described. The method includes designing the feedforward filter by determining a filter transfer function of the feedforward filter. The filter transfer function is determined using a least square method. The method also includes determining the filter transfer function by defining a target transfer function of the feedforward filter and applying the least square method using the target transfer function to determine a filter expression for the filter transfer function. The least square method is a weighted least square method.

A scent neutralizing unit includes a housing, an odor neutralizing gas emitter, and an active noise canceling system. The odor neutralizing gas emitter is coupled to the housing and is configured to provide an odor neutralizing gas that neutralizes odor particles. The active noise canceling system includes a microphone configured to generate a captured signal representing a noise signal, an acoustic transducer configured to emit audio signals, and a controller operatively coupled to the microphone and the acoustic transducer and configured to receive the captured signal from the microphone. The controller is configured to control the acoustic transducer to emit an anti-noise signal based on the captured signal where the anti-noise signal is configured to attenuate the noise signal.

Disclosed is an active-noise control device including two passive attenuation earphones each provided with an external microphone, an internal microphone and a loudspeaker. The control device includes a first processing chain having a feedforward filter, a feedback filter and a reconstruction module. The control device includes a second processing chain having a sound source identification module, said second processing chain being implemented in parallel with the first processing chain, and being suitable for parameterizing the first processing chain.

A speech reproduction device for reproducing speech based on a received speech signal so that the reproduced speech is intelligible in a clear speech zone and unintelligible in a masked speech zone includes an audio processing module configured for receiving the speech signal; a set of speech loudspeakers configured for reproducing the speech based on one or more speech loudspeaker signals; and a set of masking sound loudspeakers configured for producing a masking sound based on one or more masking sound loudspeaker signals, wherein the masking sound masks the speech in the masked speech zone; wherein the audio processing module includes a speech signal analysis module configured for producing one or more analysis signals based on spectral and/or temporal characteristics of the speech signal; wherein the audio processing module includes a masking sound generator configured for producing one or more masking sound signals based on the one or more analysis signals.

A passive neonatal transport incubator (PNTI), useful for thermo-regulating a neonate, comprising an inner volume configured by means of size and shape to accommodate the neonate, the inner volume is defined by an envelope having a main longitudinal axis with a proximal end and an opposite distal end, the envelope is at least partially perforated. Further, the PNTI is configured to be ventilated by an independently ventilated medical device, and is configured by means of size, shape and material to allow the neonate to be examined by the medical device.