Abstract: An audio signal processing circuit and an electronic device are provided. A noise detection circuit determines if the first input audio signal and a second input audio signal contain noise. The noise cancellation circuit (i), when no noise is detected, outputs a first intermediate audio signal corresponding to the first input audio signal and a second intermediate audio signal corresponding to the second input audio signal without detected noise; (ii) when noise is detected, generates a third intermediate audio signal after performing a specific noise modification process upon the first input audio signal and the second input audio signal, and outputs the first intermediate audio signal including the third input audio signal and the second intermediate audio signal including the third input audio signal. A beamforming circuit performs a beamforming process according to a differential signal of the first intermediate audio signal and the second intermediate audio signal.

Abstract: An audio signal processing circuit and an electronic device are provided. A noise detection circuit determines if the first input audio signal and a second input audio signal contain noise. The noise cancellation circuit (i), when no noise is detected, outputs a first intermediate audio signal corresponding to the first input audio signal and a second intermediate audio signal corresponding to the second input audio signal without detected noise; (ii) when noise is detected, generates a third intermediate audio signal after performing a specific noise modification process upon the first input audio signal and the second input audio signal, and outputs the first intermediate audio signal including the third input audio signal and the second intermediate audio signal including the third input audio signal. A beamforming circuit performs a beamforming process according to a differential signal of the first intermediate audio signal and the second intermediate audio signal.

Abstract: Provided is a semiconductor device manufacturing method enabling miniaturization by forming a hole in a vertical shape, capable of reducing the number of processes as compared to conventional methods, and capable of increasing productivity. The semiconductor device manufacturing method includes: forming a hole in a substrate; forming a polyimide film within the hole; anisotropically etching the substrate without using a mask covering a sidewall portion of the polyimide film within the hole and removing at least a part of a bottom portion of the polyimide film within the hole while the sidewall portion of the polyimide film remains within the hole; and filling the hole with a conductive metal.

Abstract: An inverting amplifier which drives headphones via an output capacitor includes: an operational amplifier, an input resistor having a first terminal via which an audio signal to be amplified is received, and a second terminal connected to an inverting input terminal of the operational amplifier; and a feedback resistor having a first terminal connected to an inverting input terminal of the operational amplifier, and a second terminal connected to the output terminal. A reference voltage source generates a bias voltage Vb, and supplies it to the non-inverting input terminal. A discharging path includes a discharging resistor and a first switch arranged in series between an output terminal of the reference voltage source and an fixed voltage terminal. A second switch is arranged between the output terminal of the operational amplifier and a node on the discharging path where the electric potential is higher than it is at the discharging resistor.

Abstract: Provided is a semiconductor device manufacturing method enabling miniaturization by forming a hole in a vertical shape, capable of reducing the number of processes as compared to conventional methods, and capable of increasing productivity. The semiconductor device manufacturing method includes: forming a hole in a substrate; forming a polyimide film within the hole; isotropically etching the substrate without using a mask covering a sidewall portion of the polyimide film within the hole and removing at least a part of a bottom portion of the polyimide film within the hole while the sidewall portion of the polyimide film remains within the hole; and filling the hole with a conductive metal.

Abstract: An inverting amplifier which drives headphones via an output capacitor includes: an operational amplifier, an input resistor having a first terminal via which an audio signal to be amplified is received, and a second terminal connected to an inverting input terminal of the operational amplifier; and a feedback resistor having a first terminal connected to an inverting input terminal of the operational amplifier, and a second terminal connected to the output terminal. A reference voltage source generates a bias voltage Vb, and supplies it to the non-inverting input terminal. A discharging path includes a discharging resistor and a first switch arranged in series between an output terminal of the reference voltage source and an fixed voltage terminal. A second switch is arranged between the output terminal of the operational amplifier and a node on the discharging path where the electric potential is higher than it is at the discharging resistor.

Abstract: A chromatography detector 11 includes a base substrate having a main surface 12a and a column flow path 15 formed on the main surface 12a, and a substrate block 13 and 14, which has a detection space 18 communicating with an outlet of the column flow path 15 and is stacked on the main surface 12a of the base substrate 12 so as to close a top surface of the column flow path 15.

Abstract: The present invention provides a membrane structure having favorable pressure resistance and a manufacturing method of the same. After forming an opening (21a) on a substrate (21) by Deep Digging Reactive Ion Etching (DRIE), vertical streak formed by DRIE on the side face (inner peripheral face) of the opening (21a) is removed by performing light etching with an alkali etchant. The level of overhang of an overhanging section (21b) formed when forming an opening (22a) of a BOX layer (22) is suppressed by suppressing the overetching level when forming the BOX layer (22) by etching.

Abstract: A bolt tightening device comprising a main body including a tubular case and a cylindrical housing attached to the base end of the tubular case approximately at a right angle therewith, the case being provided with an outer socket for a nut to fit in and an inner socket for fitting the tip of a bolt therein, a main handle fixed to the main body, and an auxiliary handle attached to the main body and having a grip approximately parallel to the cylindrical housing. The auxiliary handle is withdrawable from the housing toward the sockets and detachably engageable with positioning portions provided in or on the main body to clamp the main body when in a withdrawn position and in a pushed-in position.

Abstract: A device for fastening a bolt having a tip to be sheared therefrom comprises an outer socket engageable with a nut on the bolt, an inner socket engageable with the tip and retractably disposed in the outer socket, and stoppers provided between the inner socket and the outer socket for preventing the inner socket from retraction. When the tip is properly fitted into the inner socket, the stoppers are disengaged to permit the retraction of the inner socket and render the nut fittable in the outer socket.