阅读说明：本技术 一种听力保护耳机 (Hearing protection earphone ) 是由 何敏 王鹏 戴伟彬 陈光勤 于 2020-12-24 设计创作，主要内容包括：本发明公开了一种听力保护耳机,该听力保护耳机包括连接设备的接头、与所述接头连接的扬声器、以及与所述接头连接的自检控制模块；所述自检控制模块包括信号输入端,连接接头并接收输入音频信号；以及连接所述信号输入端的自检控制电路；所述自检控制电路接收所述输入音频信号并形成对所述扬声器的并联分流而控制所述扬声器的输出功率；所述自检控制电路包括与所述信号输入端连接的检波电路,与所述检波电路连接的电源,与所述检波电路连接的后级电路,以及分别与所述检波电路、所述电源、所述后级电路连接的运放控制电路。本发明通过自检控制电路形成对扬声器的并联分流,进而控制扬声器的输出功率,从而保护用户的听觉系统不受损害。(The invention discloses a hearing protection earphone which comprises a connector for connecting equipment, a loudspeaker connected with the connector, and a self-checking control module connected with the connector, wherein the self-checking control module comprises a first control module, a second control module and a third control module; the self-checking control module comprises a signal input end, a connecting joint and a receiving input audio signal; and a self-checking control circuit connected to the signal input terminal; the self-checking control circuit receives the input audio signal and forms parallel shunt to the loudspeaker to control the output power of the loudspeaker; the self-checking control circuit comprises a detection circuit connected with the signal input end, a power supply connected with the detection circuit, a post-stage circuit connected with the detection circuit, and an operational amplifier control circuit respectively connected with the detection circuit, the power supply and the post-stage circuit. The invention forms parallel shunt to the loudspeaker through the self-checking control circuit, and further controls the output power of the loudspeaker, thereby protecting the auditory system of the user from being damaged.)

1. A hearing protection earphone is characterized by comprising a joint for connecting equipment, a loudspeaker connected with the joint and a self-checking control module connected with the joint;

the self-checking control module comprises a signal input end, a connecting joint and a receiving input audio signal; and a self-checking control circuit connected to the signal input terminal; the self-checking control circuit receives the input audio signal and forms parallel shunt to the loudspeaker to control the output power of the loudspeaker;

the self-checking control circuit comprises a detection circuit connected with the signal input end, a power supply connected with the detection circuit, a post-stage circuit connected with the detection circuit, and an operational amplifier control circuit respectively connected with the detection circuit, the power supply and the post-stage circuit.

2. The hearing protection headset of claim 1, wherein the speakers include first and second speakers that are respectively connected to the connector.

3. The hearing protection headset of claim 2, wherein the signal inputs include a first signal input and a second signal input, the first signal input being connected to the first speaker and the detector circuit, respectively; the second signal input end is respectively connected with the second loudspeaker and the detection circuit.

4. The hearing protection headset of claim 3, wherein the detector circuit comprises a first capacitor, a first diode, a second capacitor, a second diode, and a third capacitor; the first capacitor is respectively connected with the first signal input end and the first diode, the first diode is respectively connected with the second diode and the third capacitor, the third capacitor is connected with the ground, the second capacitor is respectively connected with the second signal input end and the second diode, and the second diode is connected with the power supply.

5. The hearing protection headset of claim 4, wherein the back-stage circuit comprises a first transistor, a third diode, a fourth capacitor, a second transistor, a fourth diode, and a fifth capacitor;

the base electrode of the first triode is connected with the third diode, the collector electrode of the first triode is connected between the first signal input end and the first capacitor, and the emitting electrode of the first triode is connected with the ground; the fourth capacitor is respectively connected with the base electrode of the first triode and the emitting electrode of the first triode;

a base electrode of the second triode is connected with the fourth diode, a collector electrode of the second triode is connected between the second signal input end and the second capacitor, and an emitting electrode of the second triode is connected with the ground; and the fifth capacitor is respectively connected with the base electrode of the second triode and the emitting electrode of the second triode.

6. The hearing protection headset of claim 5, wherein a collector of the first transistor is connected between the second signal input and the second capacitor.

7. The hearing protection headset of claim 6, wherein the operational amplifier control circuit comprises a sixth capacitor, a first operational amplifier, a seventh capacitor, and a second operational amplifier;

the sixth capacitor is respectively connected with the collector of the first triode and the inverting input end of the first operational amplifier, the non-inverting input end of the first operational amplifier is grounded, and the output end of the first operational amplifier is connected with the third diode;

the seventh capacitor is respectively connected with the collector of the second triode and the inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is connected with the fourth diode.

8. The hearing protection headset of claim 7, wherein the power connection of the first operational amplifier and the power connection of the second operational amplifier are connected to the power supply, respectively.

9. The hearing protection headset of claim 8, wherein the first, second, third, fourth, fifth, sixth, and seventh capacitors are all dc blocking capacitors.

10. The hearing protection headset of claim 5, wherein the first transistor and the second transistor are both NPN transistors.

Technical Field

The invention belongs to the technical field of audio output equipment, and particularly relates to a hearing protection earphone.

Background

With the increasing popularity of portable music playing devices and communication devices such as walkmans, mobile phones, MP3, etc., earphones are also becoming widely used as the necessary audio output devices for the devices, and many earphone users are required to listen to music, broadcast, and receive calls through earphones every day for a long time.

The existing wired earphones mostly lack the hearing protection setting for controlling the playing volume in the safe level, when a wired earphone line is inserted into the playing equipment, when the volume of an earphone output port of the output audio equipment is too large, an earphone user needs to adjust the volume through adjusting the volume adjusting switch of the playing equipment, the talking equipment or the earphones, the operation is inconvenient, the loudspeaker output of the earphones cannot be effectively controlled, and therefore eardrums are easily damaged. Especially, children are not conscious and have incomplete development, and when wearing the earphone, the output of the speaker of the earphone is not effectively controlled, which may damage the auditory system. Therefore, there is a need to provide a hearing protection earphone to solve the above technical problems.

Disclosure of Invention

Accordingly, the present invention is directed to a hearing protection earphone, which aims to solve the technical problem that when a user wears an earphone, the sound volume of an earphone output port of an audio output device is too large, which may easily damage an eardrum or an auditory system.

In order to achieve the above purpose, the embodiment of the present invention proposes the following technical solutions:

a hearing protection earphone comprises a joint for connecting equipment, a loudspeaker connected with the joint and a self-checking control module connected with the joint;

the self-checking control module comprises a signal input end, a connecting joint and a receiving input audio signal; and a self-checking control circuit connected to the signal input terminal; the self-checking control circuit receives the input audio signal and forms parallel shunt to the loudspeaker to control the output power of the loudspeaker;

the self-checking control circuit comprises a detection circuit connected with the signal input end, a power supply connected with the detection circuit, a post-stage circuit connected with the detection circuit, and an operational amplifier control circuit respectively connected with the detection circuit, the power supply and the post-stage circuit.

Further, the speaker includes a first speaker and a second speaker respectively connected to the joint.

Further, the signal input end comprises a first signal input end and a second signal input end, and the first signal input end is respectively connected with the first loudspeaker and the detection circuit; the second signal input end is respectively connected with the second loudspeaker and the detection circuit.

Further, the detector circuit comprises a first capacitor, a first diode, a second capacitor, a second diode and a third capacitor; the first capacitor is respectively connected with the first signal input end and the first diode, the first diode is respectively connected with the second diode and the third capacitor, the third capacitor is connected with the ground, the second capacitor is respectively connected with the second signal input end and the second diode, and the second diode is connected with the power supply.

Further, the post-stage circuit comprises a first triode, a third diode, a fourth capacitor, a second triode, a fourth diode and a fifth capacitor;

the base electrode of the first triode is connected with the third diode, the collector electrode of the first triode is connected between the first signal input end and the first capacitor, and the emitting electrode of the first triode is connected with the ground; the fourth capacitor is respectively connected with the base electrode of the first triode and the emitting electrode of the first triode;

a base electrode of the second triode is connected with the fourth diode, a collector electrode of the second triode is connected between the second signal input end and the second capacitor, and an emitting electrode of the second triode is connected with the ground; and the fifth capacitor is respectively connected with the base electrode of the second triode and the emitting electrode of the second triode.

Further, the collector of the first triode is connected between the second signal input end and the second capacitor.

Furthermore, the operational amplifier control circuit comprises a sixth capacitor, a first operational amplifier, a seventh capacitor and a second operational amplifier;

the sixth capacitor is respectively connected with the collector of the first triode and the inverting input end of the first operational amplifier, the non-inverting input end of the first operational amplifier is grounded, and the output end of the first operational amplifier is connected with the third diode;

the seventh capacitor is respectively connected with the collector of the second triode and the inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is connected with the fourth diode.

Further, a power supply connection end of the first operational amplifier and a power supply connection end of the second operational amplifier are respectively connected with the power supply.

Further, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are all blocking capacitors.

Further, the first triode and the second triode are both NPN-type triodes.

Compared with the prior art, the invention has the following advantages and beneficial effects: the invention sets a detection circuit, an operational amplifier control circuit and a post-stage circuit, wherein the detection circuit, the operational amplifier control circuit and the post-stage circuit form a self-checking control circuit, so that a sound voltage signal generates stable power supply through the detection circuit, the operational amplifier control circuit is controlled to work through the power supply voltage, and the operational amplifier control circuit controls the cut-off or the conduction of the post-stage circuit, thereby forming parallel shunt to a loudspeaker, further controlling the output power of the loudspeaker, and further protecting the eardrum or the auditory system of a user from being damaged.

Drawings

Fig. 1 is a schematic structural diagram of a hearing protection headset according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a hearing protection headset according to another embodiment of the present invention;

fig. 3 is a schematic circuit diagram of the hearing protection headset of fig. 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The existing wired earphones mostly lack the hearing protection setting for controlling the playing volume in the safe level, when a wired earphone line is inserted into the playing equipment, when the volume of an earphone output port of the output audio equipment is too large, an earphone user needs to adjust the volume through adjusting the volume adjusting switch of the playing equipment, the talking equipment or the earphones, the operation is inconvenient, the loudspeaker output of the earphones cannot be effectively controlled, and therefore eardrums are easily damaged. Especially, children are not conscious and have incomplete development, and when wearing the earphone, the output of the speaker of the earphone is not effectively controlled, which may damage the auditory system. Therefore, there is a need to provide a hearing protection earphone to solve the above technical problems.

The invention sets a detection circuit, an operational amplifier control circuit and a post-stage circuit, wherein the detection circuit, the operational amplifier control circuit and the post-stage circuit form a self-checking control circuit, so that a sound voltage signal generates stable power supply through the detection circuit, the operational amplifier control circuit is controlled to work through the power supply voltage, and the operational amplifier control circuit controls the cut-off or the conduction of the post-stage circuit, thereby forming parallel shunt to a loudspeaker, further controlling the output power of the loudspeaker, and further protecting the eardrum or the auditory system of a user from being damaged. Even equipment (audio frequency setting or speech equipment etc.) is very big to the output range of earphone delivery outlet, when inserting the earphone, also can make the output of earphone speaker automatically reduce to safe volume range through the scheme of this application, the technical problem of the too big eardrum of easy damage eardrum or auditory system of volume of the earphone delivery outlet of output audio equipment when having solved the user and wearing the earphone, volume control convenient and fast, need not manual operation, the output of earphone speaker can be effectively controlled, especially, be fit for wearing user's such as earphone or children for a long time and use, eardrum or auditory system that can protect the user do not receive the harm.

Referring to fig. 1, an embodiment of the present invention provides a hearing protection earphone, including a connector 10 for connecting a device, a speaker 20 connected to the connector 10, and a self-test control module 30 connected to the connector 10;

the self-checking control module 30 comprises a signal input end 31, which is connected with the connector 10 and receives an input audio signal; and a self-test control circuit 32 connected to the signal input terminal 31; the self-test control circuit 32 receives the input audio signal and forms a parallel shunt to the loudspeaker 20 to control the output power of the loudspeaker 20;

the self-test control circuit 32 includes a detector circuit 321 connected to the signal input terminal 31, a power supply 322 connected to the detector circuit 321, a post-stage circuit 323 connected to the detector circuit 321, and an operational amplifier control circuit 324 connected to the detector circuit 321, the power supply 322, and the post-stage circuit 323.

Further, referring to fig. 2, in another embodiment, the speaker 20 includes a first speaker 21 and a second speaker 22 respectively connected to the connector 10.

Further, referring to fig. 2 again, in this embodiment, the signal input terminal 31 includes a first signal input terminal 311 and a second signal input terminal 312, the first signal input terminal 311 is connected to the first speaker 21 and the wave detection circuit 321 respectively; the second signal input terminal 312 is connected to the second speaker 22 and the detector circuit 321, respectively.

Specifically, referring to fig. 3, the detector circuit 321 includes a first capacitor C1, a first diode VD1, a second capacitor C2, a second diode VD2, and a third capacitor C3; the first capacitor C1 is respectively connected with the first signal input end 311 and the first diode VD1, the first diode VD1 is respectively connected with the second diode VD2 and the third capacitor C3, the third capacitor C3 is connected with the ground, the second capacitor C2 is respectively connected with the second signal input end 312 and the second diode VD2, and the second diode VD2 is connected with the power supply 322.

Further, referring to fig. 3 again, in this embodiment, the post-stage circuit 323 includes a first transistor VT1, a third diode VD3, a fourth capacitor C4, a second transistor VT2, a fourth diode VD4, and a fifth capacitor C5;

a base electrode VT1B of the first transistor VT1 is connected to the third diode VD3, a collector electrode VT1C of the first transistor VT1 is connected between the first signal input terminal 311 and the first capacitor C1, and an emitter electrode VT1E of the first transistor VT1 is connected to ground; the fourth capacitor C4 is respectively connected to the base VT1B of the first transistor VT1 and the emitter VT1E of the first transistor VT 1;

a base VT2B of the second transistor VT2 is connected to the fourth diode VD4, a collector VT2C of the second transistor VT2 is connected between the second signal input terminal 312 and the second capacitor C2, and an emitter VT2E of the second transistor VT2 is connected to ground; the fifth capacitor C5 is respectively connected to the base VT2B of the second transistor VT2 and the emitter VT2E of the second transistor VT 2.

Further, the collector VT1C of the first transistor VT1 is connected between the second signal input terminal 312 and the second capacitor C2.

Further, as shown in fig. 3, in this embodiment, the operational amplifier control circuit 324 includes a sixth capacitor C6, a first operational amplifier U1, a seventh capacitor C7, and a second operational amplifier U2;

the sixth capacitor C6 is respectively connected to the collector VT1C of the first transistor VT1 and the inverting input terminal U1 "of the first operational amplifier U1, the non-inverting input terminal U1+ of the first operational amplifier U1 is connected to ground, and the output terminal U10 of the first operational amplifier U1 is connected to the third diode VD 3;

the seventh capacitor C7 is respectively connected to the collector VT2C of the second transistor VT2 and the inverting input terminal U2-of the second operational amplifier U2, the non-inverting input terminal U2+ of the second operational amplifier U2 is connected to ground, and the output terminal U20 of the second operational amplifier U2 is connected to the fourth diode VD 4.

Further, the power connection terminal of the first operational amplifier U1 and the power connection terminal of the second operational amplifier U2 are connected to the power supply 322, respectively.

Further, in the present application, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are all dc blocking capacitors.

Generally, in the embodiment of the present application, the first transistor VT1 and the second transistor VT2 are both NPN transistors.

Specifically, the connector 10 described in the embodiment of the present application is a 3.5mm audio access connector. It is understood that in other embodiments, the connector may also be an audio connector or an equipment connector of other types, as long as the scheme of the present application can be implemented and the audio signal can be transmitted.

The application discloses theory of operation of hearing protection earphone: with 3.5 mm's earphone connector jointing equipment, the audio signal of equipment loops through the joint and the signal input part transmission of earphone to detection circuit, audio signal generates stable mains operated voltage through detection circuit, when mains operated voltage is greater than or equal to the fortune of control circuit and puts supply voltage, fortune is put control circuit and is begun work, through ending or switching on of triode in the control back stage circuit of fortune, thereby form the shunt of connecting in parallel to the speaker, and then the output of control speaker, reach the effect of protection user hearing, concrete theory of operation analysis is as follows:

1. under normal conditions (protection circuit does not start), when the audio signal voltage amplitude of equipment input through the joint of earphone is less than hearing protection voltage amplitude, the mains voltage who generates through the detection is less than the fortune and puts the supply voltage scope, and at this moment, fortune is put control circuit out of work, and fortune is put control circuit output low level, and the triode of back stage circuit does not switch on, and the triode presents the high resistance state, and audio signal directly leads to the speaker and the sound production.

2. When the voltage amplitude of an audio signal input by equipment through a joint of an earphone is larger than the hearing protection voltage amplitude when the hearing protection state is processed (the protection circuit is started), the power supply voltage generated by detection is larger than or equal to the operational amplifier power supply voltage range, the operational amplifier control circuit starts to work, the operational amplifier control circuit outputs high level at the moment, the conduction of a triode of a rear-stage circuit is controlled, and the triode is in a low-resistance state, namely, the triode is equivalent to a resistor connected with two ends of a loudspeaker in parallel, so that the output power of the loudspeaker is reduced, and the hearing protection effect of a user is achieved.

The invention sets a detection circuit, an operational amplifier control circuit and a post-stage circuit, wherein the detection circuit, the operational amplifier control circuit and the post-stage circuit form a self-checking control circuit, so that a sound voltage signal generates stable power supply through the detection circuit, the operational amplifier control circuit is controlled to work through the power supply voltage, and the operational amplifier control circuit controls the cut-off or the conduction of the post-stage circuit, thereby forming parallel shunt to a loudspeaker, further controlling the output power of the loudspeaker, and further protecting the eardrum or the auditory system of a user from being damaged.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.