CN201073167Y

CN201073167Y - Noise canceling pillow

Info

Publication number: CN201073167Y
Application number: CNU2007200076877U
Authority: CN
Inventors: 李铂颖
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-20
Filing date: 2007-07-20
Publication date: 2008-06-18
Anticipated expiration: 2017-07-20

Abstract

The utility model provides a denoising pillow used for eliminating noises close to ears, in particular to a denoising pillow used for reducing environmental noises, which comprises a pillow body, and a denoising device. The denoising device comprises a circuit board, a microphone, an amplifying circuit, a phase inverter circuit, a power amplifying circuit, a loudspeaker, a switch and a power supply, wherein, the input terminal of the amplifying circuit is connected with the output terminal of the microphone, the input terminal of the phase inverter circuit is connected with the output terminal of the amplifying circuit, and the input terminal of the power amplifying circuit is connected with the output terminal of the phase inverter circuit; the loudspeaker is connected with the output terminal of the power amplifying circuit, the circuit board is arranged inside the pillow body and the switch is connected with the power supply.

Description

A kind of de-noising pillow

Technical field

The utility model relates to a kind of pillow, especially relates to a kind of de-noising pillow that is used to subdue ambient noise.

Background technology

The life influence of noise on human is huge, particularly in sleep.Scientist's test noise finds that to the interference of sleep waking response just appears in sleeper's brain wave under the noise of 40～45dB stimulates.The strong noise of this explanation can influence people's rest and sleep.Also lack effective means at present and solve the ambient noise problem, people adopt usually and close window, install measures such as sound panel or sound-absorbing material additional, but in some heavy traffic locations, the vehicles (automobile, train, aircraft, steamer) low-frequency noise that produces has more penetrability and diffraction, sometimes weaken seldom by general passive isolating means, make troubles to life.

The CN2857684 utility model patent provides a kind of multifunctional pillow, mainly is made up of pillow body, pocket, earplug and eyeshade.Wherein, pocket is arranged on two sides of pillow, and earplug, eyeshade all are fixed on the pillow body.When sleep environment has noise, can alleviate interference by the stifled ear of going up of earplug.When light is too bright, can put on an eyeshade.With little article such as mobile phone, walkman, glasses, lighter, can be placed in the pocket of pillow side.Use the utility model can make sleep reduce bad external interference to greatest extent, be particularly suitable for being used for taking a nap in the workplace.

The CN2885041 utility model patent provides a kind of multifunctional pillow, constitute by arc plate and earphone system, the arc plate is tubular structure, its endoporus is the cylinder hollow shape, and the lumen cavity recess that has from the N end face vertically on its side face to the M end face, its pairing central angle β of the arc at lumen cavity recess place between 90 °～140 °, the both sides of this cylinder hollow inner chamber correspondence from inside to outside have auricle hole, voice guide hole, earphone embedding hole and the wire through-hole that is had to end face N vertically, embedding hole successively; Its extrados of arc plate is to be made of to two groups of same involute surfaces of bus cc to bus bb with by bus aa bus aa; Earphone system includes earphone, earphone lead, the wire socket of implementing electrical connection successively, and they are embedded in earphone embedding hole, wire through-hole and the embedding hole of arc plate successively admittedly.The beneficial effects of the utility model are: provide a suitable at any time pillow that uprises to the sleeping people; Return people and set up a world that does not have noise jamming.

Summary of the invention

The purpose of this utility model is to provide a kind of de-noising pillow that can eliminate near the noise of people's ear.

The technical solution of the utility model is to have installed active open noise-canceling system on common pillow additional.

The utility model comprises pillow body and noise cancellation apparatus, noise cancellation apparatus is provided with circuit board, microphone, amplifying circuit, phase inverter, power amplifier, loudspeaker, switch and power supply, the output of the input termination microphone of amplifying circuit, the output of the input termination amplifying circuit of phase inverter, the output of the input termination phase inverter of power amplifier, loudspeaker connects the output of power amplifier, and circuit board is arranged at pillow body inside, and switch is connected with power supply.

Switch can adopt dual-switch such as infrared induction and gravity triggering.

Power supply can adopt low-voltage dc power supply or external power supply, for example vehicle power, civil power etc.

The utility model mainly be utilize Analogical Electronics will be near people's ear the noise reduction in the certain limit, always subdue and reach 10～15dB.Its operation principle is that a microphone is housed in pillow body, to noise monitoring in the people's ear periphery certain limit and sampling, amplify through the oversampling circuit paraphase, produces one and differ the 180 anti-phase sound waves of spending with noise phase, superposeing near people's ear disappears mutually, thereby reaches the purpose that reduces noise.Because the response bandwidth of electro-acoustic element, gain and the distortion factor etc. are limited, the de-noising scope can only reach optimum efficiency one section finite region, so the utility model has used the adaptive circuit design, at any time monitoring outside noise changes, automatically revise the circuit configuration parameter, the inner counter noise source is changed along with the variation of outside noise energy, also can carry out the change of frequency, its de-noising frequency range is moved to new frequency range or certain single frequency according to the noise of extraneous different frequency.For the stack of energy-conservation and unnecessary sound source, the utility model adopts dual-switch such as infrared induction and gravity triggering, after on head part's pillow, just trigger the working power that opens the whole open noise-canceling system of control.And adopt automatic frequency shift technique therein, when the system of monitoring and extraneous when abnormal positive feedback self-excitation takes place, system progressively removes the frequency of its generation automatically, avoids taking place excessive stack and produces new noise, prevents the hearing impairment of people's ear.

Because the existence of Electroacooustic power conversion device, its frequency characteristic is just done very smoothly unlike electronic circuit so easily, be easy to generate amplitude distortion and phase distortion at two ends near audiorange, appearance for fear of this phenomenon, the utility model has added the phase shift correction loop in circuit, improve the de-noising bandwidth significantly.

The utility model can be gathered the noise that propagates into certain limit around people's ear, draws up with amplitude at internal mode then to equate, the antinoise source that phase place is opposite makes the decay that superposes of its and outside noise, thereby reaches reduction noise purpose in certain space.This method that is different from tradition " passive type isolation de-noising " can be called " active open de-noising ".

Description of drawings

Fig. 1 is that the structure of the utility model embodiment is formed and the user mode schematic diagram.

Fig. 2 is the theory diagram of the utility model embodiment.

Fig. 3 is that the noise cancellation apparatus circuit of the utility model embodiment is formed schematic diagram.

The specific embodiment

Following examples will be further described the utility model in conjunction with the accompanying drawings.

Referring to Fig. 1, the utility model comprises pillow body 1 and noise cancellation apparatus, and noise cancellation apparatus is provided with circuit board, microphone MIC, the 1st amplifying circuit, phase inverter, the 2nd amplifying circuit, power amplifier, loudspeaker SP, infrared trigger switch K and power supply.Be used to monitor noise about 1 couple of microphone MIC near near people's ear.About the 1st amplifying circuit of left and right acoustic channels, phase inverter, the 2nd amplifying circuit and power amplifier are located on the 1 pair of

circuit board

2 and 3, about the 1 pair of

circuit board

2 and 3 left and right sides that are separately positioned in the pillow body 1.About the 1 couple of loudspeaker SP left and right sides of being located at pillow body 1 make person of modern times's ear place.Power supply adopts low-voltage dc power supply or external power supply, for example vehicle power, civil power etc.Infrared trigger switch K is located at the top of pillow body 1, and near the below an upper section of human body head, infrared trigger switch K is connected with power supply.

The utility model utilizes Analogical Electronics, when the microphone MIC of monitoring noise detects noise, after the amplification of the 1st amplifying circuit, pass to phase inverter, after the output of phase inverter was amplified through the 2nd amplifying circuit and audio power amplifier circuit, 1 couple of loudspeaker SP sent the anti-phase noise waves 4 in the left and right sides and 5 about promotion,

anti-phase noise waves

4 and 5 and former noise mutual superposition decay, to reach the purpose that reduces noise, always the amount of subduing can reach 10～15dB.

Fig. 2 provides the theory diagram of the utility model embodiment, and in Fig. 2, the L channel circuit about only drawing in two sound channels is formed.Be used to monitor the microphone MIC of noise near near people's ear, the input of its output termination amplifying circuit 21, the input of the output termination amplifying circuit 23 of phase inverter 22, the output termination loudspeaker SP of power amplifier 24, power supply 25 can adopt low-voltage dc power supply or external power supply, for example vehicle power, civil power etc.

Fig. 3 provides the circuit of the noise cancellation apparatus of the utility model embodiment and forms schematic diagram, when the microphone MIC of monitoring noise detects noise, after the Resistor-Capacitor Unit composition amplifying circuit amplification through IC 1 (A1) and periphery, pass to phase inverter, phase inverter is formed 0～180 degree phase place conditioned circuit by FET Q1 etc., wherein the input resistance of FET FET Q1 is high, and is very little to the influence of RC phase-shift circuit.For fear of back level influence, increase the 2nd grade of FET FET Q2, its source electrode is an output, and IC 1 (A2) and peripheral Resistor-Capacitor Unit are formed the 2nd grade of amplifying circuit, then carry out audio power and amplify, promote loudspeaker SP and send anti-phase noise through IC 2.Rv1 in the circuit is the phase shift potentiometer, and Rv2 is a volume potentiometer.Above circuit is left ear de-noising circuit, in like manner, can provide the auris dextra de-noising circuit.Power supply employing+12V.

Below provide the reference model and the parameter of main components and parts among Fig. 3:

IC 1:LM358 type, the IC2:LM386 type;

FET FET Q1, Q2:2N3070 type;

Resistance R 1, R8, R9:2.2K; R2, R12:1K; R3, R4, R13, R14:10K; R5, R15:100K; R6:6.8K; R7:1M; R11:4.7; R16:10;

Potentiometer RV1:1M; RV2:10K;

Capacitor C 1, C3:1 μ F; C2, C6:0.1 μ F; C4:473; C5:100 μ F; C7:100 μ F.

Claims

1. de-noising pillow, it is characterized in that comprising pillow body and noise cancellation apparatus, noise cancellation apparatus is provided with circuit board, microphone, amplifying circuit, phase inverter, power amplifier, loudspeaker, switch and power supply, the output of the input termination microphone of amplifying circuit, the output of the input termination amplifying circuit of phase inverter, the output of the input termination phase inverter of power amplifier, loudspeaker connects the output of power amplifier, circuit board is arranged at pillow body inside, and switch is connected with power supply.

2. a kind of de-noising pillow as claimed in claim 1 is characterized in that switch is that infrared induction and gravity trigger dual-switch.

3. a kind of de-noising pillow as claimed in claim 1 is characterized in that power supply is low-voltage dc power supply or external power supply.