CN2355405Y - Noise silencer - Google Patents

Abstract

The utility model relates to a noise silencer. A speaker and a microphone are arranged in parallel in a closed containing space. By the microphone picking an ambient sound source between the microphone and the speaker, when the ambient sound source is out of balance by noises, a sound source compensation circuit and a magnifying and inverter circuit adapt the noise signal the function of conversing a phase of 180DEG directly to cause a reversal sound wave which can directly counteract the existing sound source of the noises, and keep balance of the ambient sound between the microphone and the speaker to achieve noise abatement.

Description

A kind of noise absorber of instructions

The utility model relates to a kind of noise absorber, particularly relates to a kind of direct detecting environmental noise, and produces inverted waveform in 180 ° of transfer phase place modes, and can offset with original noise source, to reach the noise absorber of the effect of abating the noise.

Industrial expansion, the facility that civilise make the annoying noise of generation in the environment relatively, especially in general factory, often because of large-scale the operation of a machine, not only influence operator's the state of mind, necessity talk in more hindering one's work, and the conventional technology that abates the noise normally adopts sound-absorbing null method and passive type noise eliminating method, wherein, this sound-absorbing null method is to utilize acoustical material to eliminate environmental noise, not only poor effect, and cost is higher, and passive type noise eliminating rule is in same position source of sound not, reach the purpose that abates the noise to repel the same phase waveform, but also there is the with high costs and unfavorable shortcoming of effect of complex structure in these modes.

The purpose of this utility model, be to provide a kind of noise absorber, be that loudspeaker and microphone are set up in parallel in the airtight accommodation space, pick up environment source of sound between itself and loudspeaker by microphone, in this environment source of sound because of noise when uneven, make source of sound because of compensating circuit, amplification and negative circuit, make noise signal directly with 180 ° phase transition, to produce inverted waveform, in air, directly cancel out each other with original noise source of sound, make the environment between microphone and loudspeaker be kept balance, and reach the purpose that abates the noise.

The technical solution of the utility model is to provide a kind of noise absorber, loudspeaker and microphone are set up in parallel in an airtight accommodation space, pick up environment source of sound between itself and loudspeaker by microphone, source of sound is transported to an amplifying circuit, mode with 180 ° of the direct translate phases of noise signal, produce the reverse voice waveform, in air, directly offset with original noise.Concrete structure is as follows:

This noise absorber comprises: an amplifying circuit, loudspeaker and microphone; Loudspeaker and microphone are connected with amplifying circuit respectively, comprise a negative circuit in the amplifying circuit;

Pick up environment source of sound between itself and loudspeaker by microphone, sound source signal is transported to amplifying circuit,, produce the reverse voice waveform, in air, directly offset with original noise in mode with 180 ° of the direct translate phases of input signal.

The technical solution of the utility model also is to provide following supplementary features:

Described microphone and loudspeaker are set up in parallel so that vertical direction is stacked.

Described microphone and loudspeaker are set up in parallel so that horizontal direction is stacked.

Described amplifying circuit also comprises two operational amplifiers of serial connection mutually.

Also comprise a compensating circuit, it is by resistance, electric capacity and connect and form, and an input end of described amplifying circuit is serially connected with compensating circuit.

Also comprise a power supply delay circuit, it is made of two transistor; Described amplifying circuit is connected in the power supply delay circuit, and power supply is connected in the first transistor, behind the resistance that the collector series connection of first electric transistor is used to discharge and recharge, the electric capacity, is connected in the base stage of transistor seconds.

Also comprise an adjustment circuit that is connected with described amplifying circuit, it is made of the resistance serial connection.

Comprise that also one connects described amplifying circuit and microphonic source of sound compensating circuit, it is by resistance, electric capacity string and connect and form.The utility model compared with the prior art advantage and good effect advantage very obviously of the present utility model as shown from the above technical solution be the utility model with and place the microphone and the loudspeaker of airtight accommodation space, cooperate electronic circuit, microphone is picked up itself and loudspeaker environment sound source signal shift 180 ° phase place, and the balance of maintenance microphone and loudspeaker environment reaches the purpose that abates the noise.

By most preferred embodiment a kind of noise absorber of the utility model is elaborated with reference to the accompanying drawings.In the accompanying drawing:

Fig. 1, the 2nd, three-dimensional appearance synoptic diagram of the present utility model.

Fig. 3 is a structuring concept synoptic diagram of the present utility model.

Fig. 4 is a noise eliminating action calcspar of the present utility model.

Fig. 5 is a noise eliminating movement oscillogram of the present utility model.

Fig. 6 is a circuit block diagram of the present utility model.

Fig. 7 is a most preferred embodiment circuit diagram of the present utility model.

As Fig. 1,2, shown in 3, the utility model is provided with the earphone 1 of confined space in both sides, be respectively equipped with loudspeaker 11 in the both sides of earphone 1, and be set up in parallel a microphone 12 in the top of loudspeaker 11 side, and make this microphone 12 be attached at one of loudspeaker 11 side with horizontal or vertical direction, and make these loudspeaker 11 and microphone 12 be connected in an electronic circuit 13, and the battery 14 that circuit voltage is provided, make this earphone 1 must be for two ears 15 of wearing the people, pick up the environment source of sound of 11 on itself and loudspeaker by microphone 12, when uneven, source of sound is exported electronic circuit 13, in environment source of sound sound noise with the mode of 180 ° of noise signal translate phases, produce the reverse voice waveform, in air, directly offset, make the environment of 11 on microphone 12 and loudspeaker keep balance, and reach the purpose that abates the noise with original noise.

As shown in Figure 4, the principle that the utility model abates the noise is that loudspeaker 11 and microphone 12 are set up in parallel, and this microphone 12 is amplified and compensation and be connected to loudspeaker via circuit, when making noise be present in 11 on microphone 12 and loudspeaker, be able to circuit and average out, its formula is:

Vout＝Vear·F(S)?…………(1)

Vear=Vin-VoutH (S) ... (2) wherein: F (S)=circuit magnification function

H (S)=circuit compensation function

The Vin=ambient sound changes into voltage

The sound that Vear=hears after treatment (voltage)

The voltage that records on the Vout=circuit is by (1) (2) $\frac{\mathrm{Vout}}{F\left(S\right)}=\mathrm{Vear}$ $\frac{\mathrm{Vout}}{F\left(S\right)}=\mathrm{Vin}-\mathrm{Vout}\·H\left(S\right)$ $\frac{\mathrm{Vout}}{F\left(S\right)}+\mathrm{Vout}\·H\left(S\right)=\mathrm{Vin}$ $\frac{\mathrm{Vout}}{\mathrm{Vin}}=\frac{F\left(S\right)}{1+F\left(S\right)\·H\left(S\right)}$ $\frac{\mathrm{Vear}\·F\left(S\right)}{\mathrm{Vin}}=\frac{F\left(S\right)}{1+F\left(S\right).H\left(S\right)}$ $\frac{\mathrm{Vear}}{\mathrm{Vin}}=\frac{1}{1+F\left(S\right)\·H\left(S\right)}$

So

That is: the relation of treated sound Vear on function is: $\mathrm{Vear}=\frac{\mathrm{<figure-callout\; id="1"\; label="Vnoise"\; filenames="Y9723022100141.png"\; state="\{\{state\}\}">Vnoise</figure-callout>}}{1+F\left(S\right)\&CenterDot;H\left(S\right)}$

F (S) H (S) more better;

And the phasing degree will equal 180 ° reaching optimum efficiency, and can prevent oscillatory occurences.

Convert by aforementioned formula,, the noise sound wave in the voice signal can be offset in air via the action of circuit, and because of compensating circuit is kept the complete of sound signal waveform, to reach the effect that abates the noise.

As shown in Figure 6, the utility model is for reaching the above-mentioned purpose that abates the noise, be in circuit, to be respectively equipped with compensating circuit 21, amplifying circuit 22, adjust circuit 23, and external source of sound compensating circuit 24, power supply delay circuit 25, wherein this amplifying circuit 22 is connected in microphone 12, after the environment source of sound amplification that microphone 12 is picked up, the phasing degree is shifted 180 ° and transport to loudspeaker 11,12 of loudspeaker 11 and microphones are averaged out, reach the purpose that abates the noise, the then available different frequency of compensating circuit 21, and should adjust circuit 23 can be for adjusting yield value, connecing 24 of source of sound compensating circuits with microphone 12 and outside connecing can be for being connected Source Music, external source of sound such as walkman, the power supply delay circuit that is connected with power supply then can be for when opening, constitute the delay of certain hour, with the back coupling phenomenon that prevents that electric power starting from causing.

As shown in Figure 7, preferred embodiment circuit diagram of the present utility model, as shown in the figure, this amplifying circuit 22 is by operational amplifier U1, formation that U2 is connected in series, U1 is closed in microphone 12 with capacitor C 1 mat, the output terminal of U2 then is connected in loudspeaker 11, and this compensating circuit 21 is with C3, R3, R4, the R5 string is connected to U1, another input end of U2, change by these elements, select the frequency of difference, the environment source of sound that makes microphone 12 inputs is in U1, U2 produces 180 ° phase shift, and the gain of circuit is then by the R7 that adjusts circuit 23, the change of R8 is to adjust its yield value;

And for making when start, avoid feedbacking oscillatory occurences, delay circuit 25 in the circuit is in power end connection-transistor Q2, and after making collector terminal series resistor R18, the R19 and R17 of this transistor Q2, be connected in the base stage of another transistor Q1, make voltage constitute the effect of time-delay via the charge and discharge of Q1 and R17, C10, be connected in connect outside microphone 12 input ends source of sound compensating circuit 24 be by and R14, the C9 and C8, the R13 that connect constituted, can be when being connected external source of sound, as the frequency compensation of input signal.

Claims (8)

1, a kind of noise absorber comprises amplifying circuit, loudspeaker and microphone; Loudspeaker and microphone are set up in parallel in an airtight accommodation space, it is characterized in that loudspeaker and microphone are connected with amplifying circuit respectively; Loudspeaker are connected with microphone; Comprise a negative circuit in the amplifying circuit;

Pick up environment source of sound between itself and loudspeaker by microphone, sound source signal is transported to amplifying circuit,, produce the reverse voice waveform, in air, directly offset with original noise in mode with 180 ° of the direct translate phases of input signal.

2, noise absorber as claimed in claim 1 is characterized in that, described microphone and loudspeaker are set up in parallel so that vertical direction is stacked.

3, noise absorber as claimed in claim 1 is characterized in that, described microphone and loudspeaker are set up in parallel so that horizontal direction is stacked.

4, noise absorber as claimed in claim 1 is characterized in that, described amplifying circuit also comprises two operational amplifiers of serial connection mutually.

5, noise absorber as claimed in claim 1 is characterized in that, also comprises a compensating circuit, and it is by resistance, electric capacity and connect and form, and an input end of described amplifying circuit is serially connected with compensating circuit.

6, noise absorber as claimed in claim 1 is characterized in that, also comprises a power supply delay circuit, and it is made up of two transistor; Described amplifying circuit is connected in the power supply delay circuit; Power supply is connected in the first transistor, behind the resistance that the collector series connection of the first transistor is used to discharge and recharge, the electric capacity, is connected in the base stage of transistor seconds.

7, noise absorber as claimed in claim 1 is characterized in that, also comprises an adjustment circuit that is connected with described amplifying circuit, and it is made of the resistance serial connection.

8, noise absorber as claimed in claim 1 is characterized in that, comprises that also one connects described amplifying circuit and microphonic source of sound compensating circuit, and it is by resistance, electric capacity string and connect and form.

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