51 results about "Noise-cancelling headphones" patented technology

A noise canceling headphone includes; a microphone that converts an ambient noise into an electrical signal; a canceling signal generating unit that generates a canceling signal by inverting a phase of a noise signal obtained by the conversion in the microphone; and a speaker that mixes and outputs an audio signal and the canceling signal. The noise canceling headphone further includes: a standard signal generating unit that generates a standard signal of a certain level; and a comparing unit that outputs a control signal according to a result of comparing the noise signal with the standard signal. The canceling signal generating unit starts operating with the control signal output from the comparing unit. With the noise canceling headphone, a noise canceling headphone can be obtained in which whether the canceling process is required is controlled according to a level of an ambient noise.

Noise canceling headphones designed so that external noise coming from all directions can be effectively concerned by means of a canceling sound before being heard by a user. These feed-forward noise canceling headphones use noise canceling headphones (10), each of which comprises an air chamber (8) formed from a space that is sealed by a member covering the outer circumference of the housing and provided more outward than a front air chamber (7), and wherein the sound-wave introducing part of a microphone (2) is inside the air chamber (8).

The invention provides a noise canceling headphone. The noise canceling headphone comprises a noise acquisition module respectively connected to an induction module and a judgment module; and a noise reduction circuit module respectively connected to the judgment module and a headphone module; when the induction module detects that a headphone is in use, then a noise signal in an environment of the noise acquisition module is started, the noise signal is transmitted to the judgment module to be analyzed and judged, and an analysis and judgment result is transmitted to the noise reduction circuit module; if the judgment result is a judgment result of opening a noise reduction function, then the noise reduction function is opened, and a de-noised audio is played through the headphone module; and if the judgment result is a judgment result of closing the noise reduction function, then the noise reduction function is closed. The invention further provides a noise reduction method applicable to the noise canceling headphone. By using the noise canceling headphone and the noise reduction method provided by the invention, automatic noise reduction can be realized, and the noise reduction function can be opened or closed automatically and timely according to the use state of the headphone on the premise that a key or a toggle switch on the headphone is not required.

The invention discloses an analogue feedback design method for an active noise-canceling headphone. The method is characterized in that optimized controller frequency characteristics are integrated on the basis of an H infinite technology; the optimized controller frequency characteristics are achieved by a digital filter, and frequency characteristics of the digital filter are fitted into a lower-order continuous domain transfer function; a generalized second-order GIC (general impedance converter) circuit is used for implementing the lower-order continuous domain transfer function. The method has the remarkable advantages that (1) the optimized controller frequency characteristics are integrated on the basis of the H infinite technology, so that the optimization of noise-canceling performance and system robustness are ensured; (2) the optimized controller frequency characteristics are achieved by the digital filter, and frequency characteristics of the digital filter are fitted into the lower-order continuous domain transfer function, so that minimum phase characteristics of a controller are ensured; (3) the generalized second-order GIC (general impedance converter) circuit can be used for implementing the lower-order continuous domain transfer function at any pole-zero position, and the method has the characteristic of low sensitivity and high physical implementability.

A noise-canceling headphone that cancels external noise with a feedforward system includes a driver unit disposed in a housing, a microphone unit that is outwardly disposed in the housing and collects the external noise, and canceling signal generator that generates a noise-canceling signal having a phase opposite to the noise entering through the headphone. The noise-canceling headphone includes an error detecting microphone unit that detects error noise uncanceled by the feedforward system, and error noise-canceling signal generator that generates an error correction signal to cancel the error noise with a feedback system.

A noise-cancelling headphone includes a cancel signal generator that receives ambient noise via an electro-acoustic transducer and generates and outputs a cancel signal eliminating the noise and a speaker unit that outputs an audio signal and a cancel signal, and connects the cancel signal generator to a first terminal of two input terminals of the speaker unit and connects a sound source of an audio signal to a second terminal thereof, whereby obtaining the noise-cancelling headphone with which one can enjoy music with high quality without the change in the sound quality and volume between when a noise-cancelling function is activated and when deactivated.

Provided is a noise cancel headphone including: a microphone which converts a surrounding noise into an electric signal; cancel signal generation means which inverts the phase of the noise signal converted by the microphone, so as to generate a cancel signal; and a speaker which mixes an audio signal with the cancel signal for output. The headphone further includes: reference signal generation means which generates a reference signal of a predetermined level; and comparison means which outputs a control signal according to the result of a comparison between the noise signal and the reference signal. The cancel signal generation means starts operation according to a control signal outputted from the comparison means. The noise cancel headphone can control whether a cancel process is required according to the level of the surrounding noise.

Noise canceling headphones designed so that external noise coming from all directions can be effectively concerned by means of a canceling sound before being heard by a user. These feed-forward noise canceling headphones use noise canceling headphones (10), each of which comprises an air chamber (8) formed from a space that is sealed by a member covering the outer circumference of the housing and provided more outward than a front air chamber (7), and wherein the sound-wave introducing part of a microphone (2) is inside the air chamber (8).

A noise canceling headphone includes a microphone provided in a headphone housing, collecting external sound, a canceling signal generating circuit generating a canceling signal in response to a signal output from the microphone which cancels external sound passing through the housing without being attenuated by a sound insulating characteristic of the headphone, a compensating signal generating circuit generating a compensating signal that compensates for the external sound attenuated by the sound insulating characteristic of the headphone, an adding circuit that adds a musical signal input from the exterior to the compensating signal, and a speaker unit that outputs an output signal from the adding circuit and the canceling signal.

The invention discloses a handheld electronic device and a corresponding anti-noise earphone. The handheld electronic device comprises the components of: a connecting interface which is provided with a first pin, a second pin and a third pin, wherein the first pin is used for transmitting first loudspeaker signals, and the second pin is used for transmitting second loudspeaker signals; a first impedance unit which is electrically connected between the second pin and power voltage; a second impedance unit which is electrically connected between the second pin and a reference level; a voltage supply unit which is electrically connected with the third pin; and a fundamental frequency circuit which is electrically connected with the second pin, the third pin and the voltage supply unit, and is used for determining whether an earphone is electrically connected with the connecting interface according to voltage change on the second pin. The handheld electronic device according to the invention can identify type of the earphone and furthermore can provide an operating power supply which is required by an anti-noise circuit of the anti-noise earphone. Furthermore the anti-noise earphone of the invention does not require any battery.

A headphone section 10 having microphone elements 14 L, 14 R for detecting a sound around the user and signal acoustic transducing elements 15 L, 15 R which function as a sound source for canceling the sound around the user housed in the headphone boxes 13 L, 13 R and a control circuit section 20 that includes a noise canceling headphone together with the headphone section 10 are separately configured. The control circuit section 20 is adjusted in such a manner that variation can be reduced and predetermined frequency characteristics and gain characteristics are achieved at a predetermined frequency. To the headphone section 10 , gain adjusting sections 16 L, 16 R are equipped.

The invention discloses a mobile device and a corresponding anti-noise earphone. The mobile device comprises a processing module, an external connection interface and a current monitoring unit. The external connection interface is electrically connected with the processing module, and has a first connection pin, a second connection pin and a third connection pin; and the current monitoring unit is electrically connected with the processing module and the third pin of the external connection interface, and is used for monitoring the current state of the third pin and sending the monitored current state to the processing module, so that the processing module can provide different voltage levels to the third connection pin accordingly. According to the mobile device, different earphone types can be judged according to the current states of the third pin of the external connection interface, and corresponding voltage levels can be provided thereby, so that after the anti-noise earphone is electrically connected with the mobile device, an anti-noise circuit can operate with the received voltage level provided by the mobile device being as a power source.

A handheld electronic device including a connection interface, a voltage supply unit and a baseband circuit is provided. When headphones are connected to the handheld electronic device, the baseband circuit can determine the type of the headphones by controlling the operation of the voltage supply unit. Furthermore, when the headphones are noise-canceling headphones, the baseband circuit can control the operation of the voltage supply unit to provide operation power to the noise-canceling headphones. In addition, corresponding noise-canceling headphones including a connection interface, at least one switch circuit, a switch control unit, a communication microphone, two speakers, a noise-canceling circuit and two noise-canceling microphones is also provided.

An apparatus and method for powering headphone electronics over a standard audio signal cable without interfering with the normal audio transmission or playback of transmitted audio signals. A software application resides on a cell / smart phone or other mobile device that combines the nominal audio output of such a mobile device, like music or spoken word, with a high frequency audio signal to produce a dual component signal. The high frequency component is decoded and rectified outside of the mobile device, either in a connector or on the structure of the headphones themselves, to produce a direct current (“DC”) that powers the headphones. The music or other audible signal component transferred over the audio cable is decoded in parallel and sent to the headphone speakers for normal playback. The invention provides an alternative power source to headphone electronics such as active noise cancelling headphones over the audio cable.