Abstract: 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).

Abstract: 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.

Abstract: An earmuff and a headphone includes: a headband; an ear cup attached to the headband; a baffle board fixed on the ear cup; an ear pad engaged to the baffle board. An air-permeable member provided between the baffle board and the ear pad.

Abstract: A headphone including a headband, an ear cup attached to the headband, a baffle plate fixed to the ear cup and having a rib wall at its periphery, an ear pad engaged with the baffle plate, and a gas permeable buffer between the ear cup and the baffle plate, wherein the buffer and the rib wall prevent a reduction in volume of a front air chamber caused by lateral pressure.

Abstract: A bone-conduction microphone built-in headset comprises: an ear pad; an ear cup capable of covering an ear; a piezoelectric element composing a bone-conduction microphone; a buffer material forming the ear pad; a baffle board provided between the ear pad and the ear cup; a wire laid from the piezoelectric element, in which the ear pad is provided on an opening end side of the ear cup, the piezoelectric element is provided inside the ear pad and supported by the buffer material to be pressed against a skin around the ear, the ear pad is detachably attached to the baffle board, and the baffle board has a connecter to which the wire is connected.

Abstract: 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.

Abstract: 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.

Abstract: 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).

Abstract: 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.

Abstract: A headphone including a headband, an ear cup attached to the headband, a baffle plate fixed to the ear cup and having a rib wall at its periphery, an ear pad engaged with the baffle plate, and a gas permeable buffer between the ear cup and the baffle plate, wherein the buffer and the rib wall prevent a reduction in volume of a front air chamber caused by lateral pressure.

Abstract: An earmuff and a headphone includes: a headband; an ear cup attached to the headband; a baffle board fixed on the ear cup; an ear pad engaged to the baffle board. An air-permeable member provided between the baffle board and the ear pad.

Abstract: An earmuff includes: a casing; a baffle board; and an ear pad including an engagement member, the engagement member being an outwardly extended part of a skin member of the ear pad. The ear pad is fixed at a front of the baffle board with the engagement member constrained to an outer surface of either of the baffle board and the casing or both by a ring-shaped elastic member, and the ear pad fixed and the baffle board define a front air chamber.

Abstract: 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.

Abstract: A bone-conduction microphone built-in headset comprises: an ear pad; an ear cup capable of covering an ear; a piezoelectric element composing a bone-conduction microphone; a buffer material forming the ear pad; a baffle board provided between the ear pad and the ear cup; a wire laid from the piezoelectric element, in which the ear pad is provided on an opening end side of the ear cup, the piezoelectric element is provided inside the ear pad and supported by the buffer material to be pressed against a skin around the ear, the ear pad is detachably attached to the baffle board, and the baffle board has a connecter to which the wire is connected.

Abstract: A filter circuit includes: an input terminal; a first resistance; a second resistance; a capacitor; and an output terminal, in which the first resistance, the second resistance, and the capacitor are connected in series in this order between the input terminal and a ground point, the output terminal is provided at a connection point of the first resistance and the second resistance, and a frequency domain is used that is higher than a maximum phase delay frequency higher than a cutoff frequency, the cutoff frequency being determined by a combined resistance value of the first and the second resistances and a capacitance value of the capacitor, so that when a frequency of an input signal becomes higher, a phase delay of an output signal relative to the input signal is reduced.

Abstract: The noise canceling system includes: a microphone unit picking up ambient noise and outputting a noise signal; a cancel signal generator generating and outputting a cancel signal eliminating the noise, and having a filter circuit outputting a signal in a predetermined frequency band included in the noise signal, an inverting amplifier circuit inverting and amplifying the output signal of the filter circuit, an amplification degree being greater than zero and smaller than one, and an adding circuit outputting a signal obtained by adding the output signal of the inverting amplifier circuit to the noise signal; and a speaker unit outputting an audio signal and the cancel signal.

Abstract: 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.