Ear clip type earphone

Abstract

The utility model discloses an ear clip type earphone. The ear clip type earphone comprises an ear front part, an ear rear part, a connecting part, a loudspeaker and a feed-forward microphone, the ear front part and the ear rear part are connected through a connecting part, and at least parts of the ear front part and the ear rear part are oppositely arranged; the ear front part is provided with a first cavity, and the loudspeaker is arranged in the first cavity; the ear rear part is provided with a second cavity, and the feed-forward microphone is arranged in the second cavity. By adopting the scheme, the problem that the noise reduction microphone easily picks up the sound leaked from the ear clip type earphone to cause howling is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of earphones, in particular to a clip-on earphone. Background Art

[0002] For open earphones, compared with traditional in-ear or semi-in-ear earphones, the wearing comfort has been greatly improved.

[0003] At present, the main forms of existing open earphones are three different types: ear-hook type, clip-on type and rear-hook type. Since clip-on earphones are not worn in the ears and do not wrap the ears during wearing, users may still be disturbed by environmental noise when wearing clip-on earphones.

[0004] In order to solve the noise problem, the clip-on earphones in related technologies usually add a noise reduction microphone on the basis of the call microphone to achieve noise reduction. The noise reduction microphone picks up environmental noise, then generates a sound wave signal with the opposite phase according to the noise signal, and plays the generated anti-noise signal through the speaker. When the anti-noise signal meets the external noise, the two will interfere, and the sound wave signals with opposite phases will cancel the noise signal, thereby reducing the interference of noise in the listening experience.

[0005] However, since the noise reduction microphone and the speaker are relatively close during the noise reduction process, the noise reduction microphone is likely to pick up the sound leaking outside the clip-on earphone, resulting in a howling phenomenon. Summary of the Utility Model

[0006] The utility model provides a clip-on earphone to solve the problem that the noise reduction microphone is likely to pick up the sound leaking outside the clip-on earphone and cause howling.

[0007] According to one aspect of the utility model, there is provided a clip-on earphone, which includes: an ear front part, an ear rear part, a connecting part, a speaker and a feedforward microphone;

[0008] The ear front part is connected to the ear rear part through the connecting part, and the ear front part and the ear rear part are at least partially oppositely arranged;

[0009] The ear front part is provided with a first cavity, and the speaker is arranged inside the first cavity;

[0010] The ear rear part is provided with a second cavity, and the feedforward microphone is arranged inside the second cavity.

[0011] In an optional embodiment of the utility model, the clip-on earphone further includes: a feedback microphone, and the feedback microphone is arranged inside the first cavity.

[0012] In an alternative embodiment of the present utility model, the ear clip-type earphone further includes: an earphone nozzle, which is disposed at the front part of the ear; the distance between the rear-feed microphone and the earphone nozzle is less than the distance between the speaker and the earphone nozzle.

[0013] In an alternative embodiment of the present utility model, a first sound pickup hole penetrating into the interior of the second cavity is provided at the rear part of the ear, and the front-feed microphone is configured to pick up sound signals outside the second cavity through the first sound pickup hole; the first sound pickup hole is disposed on a side of the rear part of the ear facing away from the front part of the ear.

[0014] In an alternative embodiment of the present utility model, the distance between the first sound pickup hole and the earphone nozzle is 29 - 33 mm.

[0015] In an alternative embodiment of the present utility model, a tuning hole penetrating into the interior of the first cavity is further provided at the front part of the ear, and the distance between the first sound pickup hole and the tuning hole is 20 - 24 mm.

[0016] In an alternative embodiment of the present utility model, in a worn state, the earphone nozzle reaches a distance of 10 - 18 mm from the ear.

[0017] In an alternative embodiment of the present utility model, the ear clip-type earphone further includes: a control circuit;

[0018] The control circuit is electrically connected to the front-feed microphone, the rear-feed microphone, and the speaker respectively.

[0019] In an alternative embodiment of the present utility model, the control circuit includes a first noise reduction sub-circuit, a second noise reduction sub-circuit, and a signal processing sub-circuit;

[0020] The input end of the first noise reduction sub-circuit is electrically connected to the front-feed microphone, and the output end of the first noise reduction sub-circuit is electrically connected to the first noise reduction signal input end of the signal processing sub-circuit;

[0021] The input end of the second noise reduction sub-circuit is electrically connected to the rear-feed microphone, and the output end of the second noise reduction sub-circuit is electrically connected to the second noise reduction signal input end of the signal processing sub-circuit;

[0022] The output end of the signal processing sub-circuit is electrically connected to the speaker.

[0023] In an alternative embodiment of the present utility model, the first noise reduction sub-circuit includes a first analog gain input unit, a first analog-to-digital conversion unit, a first filtering unit, and a first digital gain input unit; the input end of the first analog gain input unit is electrically connected to the feedforward microphone; the input end of the first analog-to-digital conversion unit is electrically connected to the output end of the first analog gain input unit; the input end of the first filtering unit is electrically connected to the output end of the first analog-to-digital conversion unit; the input end of the first digital gain input unit is electrically connected to the output end of the first filtering unit, and the output end of the first digital gain input unit is electrically connected to the first noise reduction signal input end of the signal processing sub-circuit; and / or,

[0024] The second noise reduction sub-circuit includes a second analog gain input unit, a second analog-to-digital conversion unit, a second filtering unit, and a second digital gain input unit; the input end of the second analog gain input unit is electrically connected to the feedback microphone; the input end of the second analog-to-digital conversion unit is electrically connected to the output end of the second analog gain input unit; the input end of the second filtering unit is electrically connected to the output end of the second analog-to-digital conversion unit; the input end of the second digital gain input unit is electrically connected to the output end of the second filtering unit, and the output end of the second digital gain input unit is electrically connected to the second noise reduction signal input end of the signal processing sub-circuit.

[0025] In an alternative embodiment of the present utility model, the signal processing sub-circuit includes a first adder, a digital-to-analog conversion unit, and an amplifier unit;

[0026] The first input end of the first adder is electrically connected to the output end of the first noise reduction sub-circuit, and the second input end of the first adder is connected to the output end of the second noise reduction sub-circuit;

[0027] The input end of the digital-to-analog conversion unit is electrically connected to the output end of the first adder;

[0028] The input end of the amplifier unit is electrically connected to the output end of the digital-to-analog conversion unit, and the output end of the amplifier unit is electrically connected to the speaker.

[0029] In an alternative embodiment of the present utility model, the control circuit further includes a music signal control sub-circuit;

[0030] The output end of the music signal control sub-circuit is electrically connected to the music signal input end of the signal processing sub-circuit.

[0031] In an alternative embodiment of the present utility model, the control circuit further includes a signal compensation sub-circuit;

[0032] The input end of the signal compensation sub - circuit is electrically connected to the compensation output end of the music signal control sub - circuit, and the output end of the signal compensation sub - circuit is electrically connected to the compensation input end of the second noise reduction sub - circuit.

[0033] In the technical solution of the embodiment of the present utility model, by arranging the loudspeaker in the first cavity at the front part of the ear and arranging the feed - forward microphone in the second cavity at the rear part of the ear, and using the isolation barrier formed by the human ear auricle between the loudspeaker and the feed - forward microphone, the phenomenon of howling caused by the feed - forward microphone picking up the sound leaking from the loudspeaker is reduced.

[0034] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following - described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of a clip - on earphone provided by an embodiment of the present utility model;

[0037] Figure 2 is Figure 1 a schematic internal structure diagram of the clip - on earphone;

[0038] Figure 3 is Figure 1 a schematic structural diagram of the clip - on earphone from another perspective;

[0039] Figure 4 is a circuit block diagram of a clip - on earphone provided by an embodiment of the present utility model;

[0040] Figure 5 is a circuit schematic diagram of a clip - on earphone provided by an embodiment of the present utility model;

[0041] Figure 6 is a frequency response comparison diagram of the clip - on earphone provided by an embodiment of the present utility model and a conventional open - type earphone;

[0042] Figure 7 is a noise reduction effect diagram of the clip - on earphone provided by an embodiment of the present utility model.

[0043] Wherein: 1. Front part of the ear; 11. First cavity; 12. Sound outlet nozzle; 13. Call pickup hole; 2. Rear part of the ear; 21. Second cavity; 22. First pickup hole; 3. Connecting part; 4. Speaker; 5. Feedforward microphone; 6. Feedback microphone; 7. Call microphone; 8. Control circuit; 81. First noise reduction sub-circuit; 811. First analog gain input unit; 812. First analog-to-digital conversion unit; 813. First filtering unit; 814. First digital gain input unit; 82. Second noise reduction sub-circuit; 821. Second analog gain input unit; 822. Second analog-to-digital conversion unit; 823. Second filtering unit; 824. Second digital gain input unit; 83. Signal processing sub-circuit; 831. First adder; 832. Digital-to-analog conversion unit; 833. Amplifier unit; 84. Music signal control sub-circuit; 841. Music signal decoding unit; 842. Music filtering unit; 843. Third digital gain input unit; 85. Signal compensation sub-circuit; 851. Compensation filtering unit; 852. Fourth digital gain input unit; 853. Second adder; 9. Tuning hole; 10. Circuit board. Detailed implementation manners

[0044] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0045] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] An embodiment of the present utility model provides a clip-on earphone, as Figure 1 and Figure 2 shown. The clip-on earphone includes a front part 1 of the ear, a rear part 2 of the ear, a connecting part 3, a speaker 4, and a feedforward microphone 5.

[0047] The front part 1 of the ear is connected to the back part 2 of the ear by the connecting part 3, and the front part 1 of the ear is at least partially arranged opposite to the back part 2 of the ear. At this time, a channel for clamping the auricle is formed between the front part 1 of the ear and the back part 2 of the ear. When the user wears the ear clip earphone, the front part 1 of the ear is located on the side of the auricle close to the ear canal, and it contacts the concha cavity on the front side of the ear. The back part 2 of the ear is located on the side of the auricle away from the ear canal, and it contacts the back side of the ear. At this time, the auricle is located between the front part 1 of the ear and the back part 2 of the ear. In addition, the connecting part 3 is elastic, so that the front part 1 of the ear and the back part 2 of the ear can be relatively close or far away through the elastic deformation of the connecting part 3. In the wearing state, the connecting part 3 is elastically deformed so that the front part 1 of the ear and the back part 2 of the ear clamp the auricle.

[0048] The front part of the ear 1 is provided with a first cavity 11, and the speaker 4 is arranged inside the first cavity 11; wherein the speaker 4 is an electroacoustic transducer device that converts an electrical signal that changes according to sound into a sound signal to radiate sound waves outward. Since the speaker 4 is located in the first cavity 11 of the front part of the ear 1, the distance between the speaker 4 and the ear canal is shorter, which effectively improves the sound pressure level output by the speaker 4.

[0049] The ear rear portion 2 is provided with a second cavity 21, and the feedforward microphone 5 is arranged inside the second cavity 21. The feedforward microphone 5 refers to a microphone used to monitor environmental noise to achieve noise reduction. After the feedforward microphone collects the noise signal, it emits a reverse sound wave through the speaker 4 to cancel the noise.

[0050] The above scheme, by setting the speaker 4 in the first cavity 11 of the front part of the ear 1, and setting the feedforward microphone 5 in the second cavity 21 of the back part of the ear 2, compared with the related art of placing the speaker 4 and the feedforward microphone 5 in the same cavity, this scheme places the speaker 4 and the feedforward microphone 5 in different cavities, and at the same time utilizes the isolation barrier formed by the human ear auricle between the speaker 4 and the feedforward microphone 5 to reduce the phenomenon of howling caused by the feedforward microphone 5 picking up the sound leaking from the speaker 4.

[0051] In an optional embodiment of the present utility model, as Figure 1 and Figure 2 As shown, the ear clip earphone also includes a feed-back microphone 6, which is arranged in the first cavity 11. The feed-back microphone 6 refers to a microphone used to monitor environmental noise to achieve noise reduction. It is arranged in the first cavity 11 and can monitor environmental noise near the ear canal. The feed-forward microphone monitors environmental noise, and the feed-back microphone detects the noise transmitted to the human ear after filtering, and performs noise elimination at the same time, which can achieve a deeper noise reduction effect and enable users to obtain a good experience effect.

[0052] In an alternative embodiment of the present utility model, the earclip-type earphone further includes a sound outlet nozzle 12. The sound outlet nozzle 12 is disposed on the front part of the ear 1, and the sound outlet nozzle 12 is in communication with the first cavity 11. The sound waves emitted by the speaker 4 reach the human ear through the sound outlet nozzle 12. The distance between the rear-feed microphone 6 and the sound outlet nozzle 12 is less than the distance between the speaker 4 and the sound outlet nozzle 12. Therefore, the environmental noise picked up by the rear-feed microphone 6 can more accurately reflect the noise transmitted to the human ear.

[0053] In the worn state, the distance from the sound outlet nozzle 12 to the ear is 10 - 18 mm. Compared with conventional ear-hook type open earphones, the sound outlet nozzle 12 of this embodiment is shortened by more than 5 mm, which can effectively improve the frequency response and sound pressure level output by the speaker 4.

[0054] It should be supplementary noted that various structures (such as the helix, concha cavity, and cymba conchae, etc.) or spatial positions of the human body, the head of the human body, the ear, and the ear in the embodiments of the present application are all based on the head and ear models (such as the GRAS 45BC KEMAR human head model, hereinafter referred to as the GRAS human head model) prepared according to the ANSI:S3.36, S3.25, and IEC:60318-72022 standards and the corresponding structures thereon or determined based on this model. The worn state in the present application refers to the state of wearing the earclip-type earphone on the ear of the above model, and the natural state refers to the non-worn state of the earclip-type earphone, that is, the state without external force acting on it.

[0055] The above GRAS human head model is respectively equipped with a microphone MIC at the end of the left and right ear canals, so that the left and right ear canals are not connected to each other. The outer end face of each MIC faces the ear canal orifice of the corresponding ear canal, and the outer end face of the MIC simulates the eardrum of the human ear. In the embodiments of the present application, the distance from the sound outlet nozzle 12 to the ear is the distance from the sound outlet nozzle 12 to the outer end face of the corresponding MIC along the extending direction of the ear canal of the GRAS human head model.

[0056] In an alternative embodiment of the present utility model, as Figure 1 and Figure 2 shown, the earclip-type earphone further includes a tuning hole 9. The tuning hole 9 is disposed on the front part of the ear 1. The tuning hole 9 allows air to flow freely in the speaker 4. In this way, not only can pressure accumulation be prevented, but also better sound quality and bass effects can be created.

[0057] In an alternative embodiment of the present utility model, as Figure 2 and Figure 3As shown in the figure, the rear ear part 2 is provided with a first sound pickup hole 22 that penetrates into the interior of the second cavity 21. The feedforward microphone 5 is used to pick up the sound signal outside the second cavity 21 through the first sound pickup hole 22. The first sound pickup hole 22 is arranged on the side of the rear ear part 2 away from the front ear part 1. The distances from the first sound pickup hole 22 to the sound outlet nozzle 12 and to the tuning hole 9 are both increased compared with those of conventional ear-hook type open earphones. At the same time, by using the isolation barrier formed by the human ear auricle between the speaker 4 and the first sound pickup hole 22, the phenomenon of howling caused by the feedforward microphone 5 picking up the sound leaking from the speaker 4 can be reduced, and the problem of wind noise can also be effectively solved.

[0058] In an alternative embodiment of the present utility model, as Figure 2 and Figure 3 shown, the distance L1 from the first sound pickup hole 22 to the sound outlet nozzle 12 is 29 - 33 mm. In some embodiments, the distance L1 from the first sound pickup hole 22 to the sound outlet nozzle 12 is 30 - 31 mm. Preferably, the distance L1 from the first sound pickup hole 22 to the sound outlet nozzle 12 is 30.8 mm. In this solution, the distance from the first sound pickup hole 22 to the sound outlet nozzle 12 is increased by about 20 mm compared with that of conventional ear-hook type open earphones.

[0059] In an alternative embodiment of the present utility model, as Figure 2 and Figure 3 shown, the distance L2 from the first sound pickup hole 22 to the tuning hole 9 is 20 - 24 mm. In some embodiments, the distance L2 from the first sound pickup hole 22 to the tuning hole 9 is 21 - 23 mm. In some embodiments, the distance L2 from the first sound pickup hole 22 to the tuning hole 9 is 21.3 mm, which is increased by about 10 mm compared with that of conventional ear-hook type open earphones.

[0060] Combined with the above setting of the distance of the first sound pickup hole 22, in this embodiment, by using the isolation barrier formed by the human ear auricle between the speaker 4 and the feedforward microphone 5 in the wearing state, the phenomenon of howling caused by the microphone picking up the leaking sound can be further reduced, and the problem of wind noise can also be effectively solved.

[0061] In an alternative embodiment of the present utility model, as Figure 1 and Figure 2 shown, the ear clip type earphone further includes a call microphone 7, and the call microphone 7 is arranged in the first cavity 11. The front ear part 1 is further provided with a call sound pickup hole 13 that penetrates into the interior of the first cavity 11. The call microphone 7 is used to pick up the sound signal outside the first cavity 11 through the call sound pickup hole 13. Among them, the call microphone 7 refers to a microphone that receives voice information for calls. The user can make calls through the call microphone 7 in the ear clip type earphone. The call sound pickup hole 13 is mainly used to pick up human voices. Since the call sound pickup hole 13 is arranged on the front ear part 1, the human voice can be picked up more accurately.

[0062] Specifically, the sound outlet 12 is located at the end of the ear front part 1 away from the connection part 3, and at the same time on the side of the tuning hole 9 away from the call pickup hole 13; in the worn state, the sound outlet 12 faces the ear canal opening of the human ear to ensure that the sound can be directly transmitted into the user's ear.

[0063] In an alternative embodiment of the present utility model, as Figure 4 shown, the ear clip-type earphone further includes: a control circuit 8; the control circuit 8 is electrically connected to the feedforward microphone 5, the feedback microphone 6, and the speaker 4 respectively. Among them, the control circuit 8, the feedforward microphone 5, the feedback microphone 6, and the speaker 4 constitute the active noise reduction circuit system of the ear clip-type earphone. The control circuit 8 refers to a circuit that can process the noise signals collected by the feedforward microphone 5 and the feedback microphone 6, generate a sound wave signal with a phase opposite to that of the noise signal according to the noise signals, and play the generated anti-noise signal through the speaker 4. When the anti-noise signal meets the external noise, the two will interfere, and the sound wave signals with opposite phases will cancel the noise signals, thereby reducing the interference of noise in the listening experience and enabling the open ear clip-type earphone to also have a good active noise reduction effect.

[0064] In an alternative embodiment of the present utility model, as Figure 2 and Figure 4 shown, the ear clip-type earphone further includes a circuit board 10, and the control circuit 8 is arranged on the circuit board 10. Preferably, the circuit board 10 is arranged in the second cavity 21.

[0065] Combined with the distance setting of the above-mentioned sound outlet 12, the ANC circuit system formed by the feedforward microphone 5, the feedback microphone 6, and the control circuit 8 enables the present ear clip-type earphone to have a good active noise reduction effect. The following uses specific embodiments to elaborate on the specific structure of the ANC circuit system formed by the feedforward microphone 5, the feedback microphone 6, and the control circuit 8.

[0066] On the basis of the above embodiment, as Figure 4 and Figure 5 shown, the control circuit 8 includes a first noise reduction sub-circuit 81, a second noise reduction sub-circuit 82, and a signal processing sub-circuit 83. The input end of the first noise reduction sub-circuit 81 is electrically connected to the feedforward microphone 5, and the output end of the first noise reduction sub-circuit 81 is electrically connected to the first noise reduction signal input end of the signal processing sub-circuit 83; the first noise reduction sub-circuit 81 refers to a circuit that processes the noise signals collected by the feedforward microphone 5. The input end of the second noise reduction sub-circuit 82 is electrically connected to the feedback microphone 6, and the output end of the second noise reduction sub-circuit 82 is electrically connected to the second noise reduction signal input end of the signal processing sub-circuit 83; the second noise reduction sub-circuit 82 refers to a circuit that processes the noise signals collected by the feedback microphone 6. The output end of the signal processing sub-circuit 83 is electrically connected to the speaker 4 to drive the speaker 4 to emit sound according to the result of signal processing.

[0067] In an alternative embodiment of the present utility model, as Figure 5 shown, the first noise reduction sub-circuit 81 includes a first analog gain input unit 811, a first analog-to-digital conversion unit 812, a first filtering unit 813, and a first digital gain input unit 814; the input end of the first analog gain input unit 811 is electrically connected to the feedforward microphone 5; the input end of the first analog-to-digital conversion unit 812 is electrically connected to the output end of the first analog gain input unit 811; the input end of the first filtering unit 813 is electrically connected to the output end of the first analog-to-digital conversion unit 812; the input end of the first digital gain input unit 814 is electrically connected to the output end of the first filtering unit 813, and the output end of the first digital gain input unit 814 is electrically connected to the first noise reduction signal input end of the signal processing sub-circuit 83.

[0068] Among them, the first analog gain input unit 811 can adjust the amplitude of the input signal as an analog signal, so that the input signal works within a suitable amplitude range. The first analog-to-digital conversion unit 812 can convert the analog signal into a digital signal. The first filtering unit 813 is used for filtering to realize the signal processing of generating an anti-noise wave. The first digital gain input unit 814 is used to adjust the amplitude of the digital signal, so that the amplitude of the anti-noise signal is calibrated to be equal to the amplitude of the noise signal. Therefore, after the feedforward microphone 5 picks up the noise signal, at this time the noise signal is an analog signal, which will first be adjusted in amplitude by the first analog gain input unit 811, then converted into a digital signal by the first analog-to-digital conversion unit 812, then filtered by the first filtering unit 813 to generate an anti-noise signal, and finally the amplitude of the digital signal is adjusted by the first digital gain input unit 814 to realize the processing of the noise signal collected by the feedforward microphone 5.

[0069] Based on the above embodiment, the first analog gain input unit 811 is an adjustable analog gain input unit, which is used to adjust the amplitude of the input signal of the feedforward microphone, so that the input signal works within a suitable amplitude range; the first analog-to-digital conversion unit 812 is used to convert the input signal as an analog signal into a digital signal, and the first filtering unit 813 includes a feedforward noise reduction filter unit (FF IIR Filter), which is used for the signal processing of generating an anti-noise wave in the feedforward noise reduction path. The first digital gain input unit 814 is an adjustable digital gain input unit, which is used to adjust the amplitude of the digital signal, so that the amplitude of the anti-noise signal is calibrated to be equal to the amplitude of the noise signal.

[0070] In an alternative embodiment of the present utility model, as Figure 5As shown, the second noise reduction sub-circuit 82 includes a second analog gain input unit 821, a second analog-to-digital conversion unit 822, a second filtering unit 823, and a second digital gain input unit 824; the input end of the second analog gain input unit 821 is electrically connected to the rear-feed microphone 6; the input end of the second analog-to-digital conversion unit 822 is electrically connected to the output end of the second analog gain input unit 821; the input end of the second filtering unit 823 is electrically connected to the output end of the second analog-to-digital conversion unit 822; the input end of the second digital gain input unit 824 is electrically connected to the output end of the second filtering unit 823, and the output end of the second digital gain input unit 824 is electrically connected to the second noise reduction signal input end of the signal processing sub-circuit 83.

[0071] Among them, the second analog gain input unit 821 can adjust the amplitude of the input signal that is an analog signal, so that the input signal works within a suitable amplitude range. The second analog-to-digital conversion unit 822 can convert the analog signal into a digital signal. The second filtering unit 823 is used for filtering to realize the signal processing of generating an anti-noise wave. The second digital gain input unit 824 is used to adjust the amplitude of the digital signal so that the amplitude of the anti-noise signal is calibrated to be equal to the amplitude of the noise signal. Therefore, after the rear-feed microphone 6 picks up the noise signal, at this time the noise signal is an analog signal, which will first be adjusted in amplitude by the second analog gain input unit 821, then converted into a digital signal by the second analog-to-digital conversion unit 822, then filtered by the second filtering unit 823 to generate an anti-noise signal, and finally the amplitude of the digital signal is adjusted by the second digital gain input unit 824 to realize the processing of the noise signal collected by the rear-feed microphone 6.

[0072] Based on the above embodiments, the second analog gain input unit 821 is an adjustable analog gain input unit for adjusting the amplitude of the input signal of the rear-feed microphone so that the input signal works within a suitable amplitude range; the second analog-to-digital conversion unit 822 is used to convert the input signal that is an analog signal into a digital signal, and the second filtering unit 823 includes a feedback noise reduction filter unit (FB IIR Filter) for performing signal processing of generating an anti-noise wave in the feedback noise reduction path. The second digital gain input unit 824 is an adjustable digital gain input unit for adjusting the amplitude of the digital signal so that the amplitude of the anti-noise signal is calibrated to be equal to the amplitude of the noise signal.

[0073] In an alternative embodiment of the present invention, as Figure 5As shown, the signal processing sub-circuit 83 includes a first adder 831, a digital-to-analog conversion unit 832, and an amplifier unit 833. The first input terminal of the first adder 831 serves as the first noise reduction signal input terminal of the signal processing sub-circuit 83 and is electrically connected to the output terminal of the first noise reduction sub-circuit 81. The second input terminal of the first adder 831 serves as the second noise reduction signal input terminal of the signal processing sub-circuit 83 and is connected to the output terminal of the second noise reduction sub-circuit 82. The input terminal of the digital-to-analog conversion unit 832 is electrically connected to the output terminal of the first adder 831. The input terminal of the amplifier unit 833 is electrically connected to the output terminal of the digital-to-analog conversion unit 832, and the output terminal of the amplifier unit 833 is electrically connected to the speaker 4.

[0074] Among them, the first adder 831 is a device for generating the sum of numbers. The digital-to-analog conversion unit 832 can convert digital signals into analog signals. Preferably, the digital-to-analog conversion unit 832 includes a digital-to-analog converter, so as to be able to convert the processed digital signals into analog signals. The amplifier unit 833 is used to amplify the signal to generate a drive signal that meets the output power, and then drive the speaker 4 to emit sound. Therefore, the signal processing sub-circuit 83 sums up the digital signals of the first noise reduction sub-circuit 81 and the second noise reduction sub-circuit 82 through the first adder 831, then converts the digital signals into analog signals through the digital-to-analog conversion unit 832, and finally amplifies the signal through the amplifier unit 833 to drive the speaker 4 to emit sound. In an alternative embodiment of the present invention, as Figure 5 shown, the control circuit 8 further includes a music signal control sub-circuit 84. The output terminal of the music signal control sub-circuit 84 is electrically connected to the music signal input terminal of the signal processing sub-circuit 83. Therefore, the music signal is processed by the music signal control sub-circuit 84 and the signal processing sub-circuit 83 and then drives the speaker 4 to play music, facilitating the user to listen to music through the earclip-type headphones.

[0075] On the basis of the above embodiment, the music signal control sub-circuit 84 includes a music signal decoding unit 841, a music filtering unit 842, and a third digital gain input unit 843. The music signal decoding unit 841 is used to encode and decode the music signal. The input terminal of the music filtering unit 842 is electrically connected to the output terminal of the music signal decoding unit 841 and is used to filter the encoded and decoded music signal. The input terminal of the third digital gain input unit 843 is electrically connected to the output terminal of the music filtering unit 842. The output terminal of the third digital gain input unit 843 serves as the output terminal of the music signal control sub-circuit 84 and is electrically connected to the music signal input terminal of the signal processing sub-circuit 83, and is used to adjust the amplitude of the filtered music signal.

[0076] Exemplarily, the music signal decoding unit 841 includes a music signal SBC / AAC encoding and decoding unit for encoding and decoding signals for Bluetooth music playback. The music filtering unit 842 includes a music EQ debugging filter unit (EQ IIR Filter) for filter signal processing for sound quality debugging. The third digital gain input unit 843 is an adjustable digital gain input unit for adjusting the amplitude of the digital signal to calibrate the amplitude of the anti-noise signal to be equal to the amplitude of the noise signal.

[0077] In an alternative embodiment of the present invention, as Figure 5 shown, the control circuit 8 further includes a signal compensation sub-circuit 85. The input end of the signal compensation sub-circuit 85 is electrically connected to the compensation output end of the music signal control sub-circuit 84, and the output end of the signal compensation sub-circuit 85 is electrically connected to the compensation input end of the second noise reduction sub-circuit 82. Among them, since the feedback microphone 6 picks up not only noise but also the music emitted by the speaker 4, the low-frequency sound of the music after noise reduction will be reduced. The signal compensation sub-circuit 85 is used to compensate for the loss of the music low-frequency signal caused by noise reduction to prevent the attenuation of the music low-frequency.

[0078] Based on the above embodiment, the signal compensation sub-circuit 85 includes a compensation filtering unit 851, a fourth digital gain input unit 852, and a second adder 853. The input end of the compensation filtering unit 851 is electrically connected to the output end of the music filtering unit 842. The compensation filtering unit 851 is used for filtering the digital signal and performing signal processing to compensate for the signal attenuation caused by feedback noise reduction. The input end of the fourth digital gain input unit 852 is electrically connected to the output end of the compensation filtering unit 851. The fourth digital gain input unit 852 is used for adjusting the signal amplitude of the digital signal after signal processing. The output end of the second analog-to-digital conversion unit 822 is electrically connected to the first input end of the second adder 853. The output end of the fourth digital gain input unit 852 is electrically connected to the second input end of the second adder 853. The output end of the second adder 853 is electrically connected to the compensation input end of the second noise reduction sub-circuit 82.

[0079] Exemplarily, the compensation filtering unit 851 includes a music compensation filter unit (MC IIR Filter) for performing signal processing to compensate for the signal attenuation caused by feedback noise reduction. The fourth digital gain input unit 852 is an adjustable digital gain input unit for adjusting the amplitude of the digital signal to calibrate the amplitude of the anti-noise signal to be equal to the amplitude of the noise signal.

[0080] Figure 6It is a frequency response comparison diagram of the earclip-type earphone and the conventional open earphone provided by the embodiment of the present invention. L1 is the frequency response curve of the earclip-type earphone provided by the embodiment of the present invention, and L2 is the frequency response curve of the conventional open earphone. From the comparison results, it can be seen that the earclip-type earphone provided by the embodiment of the present invention effectively improves the frequency response.

[0081] Figure 7 It is a noise reduction effect diagram of the earclip-type earphone provided by the embodiment of the present invention. L3 is the ambient noise curve, L4 is the passive noise reduction curve of the earclip-type earphone provided by the embodiment of the present invention, and L5 is the active noise reduction curve of the earclip-type earphone provided by the embodiment of the present invention. It can be seen that the earclip-type earphone provided by the embodiment of the present invention has a better noise reduction effect and can effectively reduce the ambient noise transmitted to the human ear.

[0082] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitations are imposed herein.

[0083] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An ear clip type earphone, characterized in that: include: The front part of the ear, the back part of the ear, the connection part, the speaker and the feed-forward microphone; The front part of the ear is connected to the rear part of the ear through the connecting part, and the front part of the ear and the rear part of the ear are at least partially arranged opposite to each other; The front part of the ear is provided with a first cavity, and the speaker is arranged inside the first cavity; A second cavity is provided behind the ear, and the feedforward microphone is arranged inside the second cavity.

2. The ear-clip earphone according to claim 1, characterized in that: Also includes: A feedback microphone is disposed in the first cavity.

3. The ear-clip earphone according to claim 2, characterized in that: Also includes: A sound outlet, the sound outlet is arranged in front of the ear; The distance between the feed-back microphone and the sound outlet is smaller than the distance between the loudspeaker and the sound outlet.

4. The ear-clip earphone according to claim 3, characterized in that: The back of the ear is provided with a first sound pickup hole which passes through the inside of the second cavity, and the feedforward microphone is used to pick up the sound signal outside the second cavity through the first sound pickup hole; the first sound pickup hole is arranged on the side of the back of the ear away from the front of the ear.

5. The ear-clip earphone according to claim 4, characterized in that: The distance between the first sound pickup hole and the sound outlet is 29-33 mm.

6. The ear-clip earphone according to claim 4, characterized in that: The front part of the ear is also provided with a tuning hole which passes through to the inside of the first cavity, and the distance between the first sound pickup hole and the tuning hole is 20-24 mm.

7. The ear clip type earphone according to any one of claims 3 to 6, characterized in that: When worn, the distance from the sound outlet to the ear is 10-18 mm.

8. The ear-clip headphone according to any one of claims 2 to 6, characterized in that: Also includes: Control circuit; The control circuit is electrically connected to the feedforward microphone, the feedback microphone and the speaker respectively.

9. The ear-clip earphone according to claim 8, characterized in that: The control circuit includes a first noise reduction subcircuit, a second noise reduction subcircuit and a signal processing subcircuit; The input end of the first noise reduction sub-circuit is electrically connected to the feedforward microphone, and the output end of the first noise reduction sub-circuit is electrically connected to the first noise reduction signal input end of the signal processing sub-circuit; The input end of the second noise reduction sub-circuit is electrically connected to the feedback microphone, and the output end of the second noise reduction sub-circuit is electrically connected to the second noise reduction signal input end of the signal processing sub-circuit; The output end of the signal processing subcircuit is electrically connected to the speaker.

10. The ear-clip headphone according to claim 9, characterized in that: The first noise reduction subcircuit comprises a first analog gain input unit, a first analog-to-digital conversion unit, a first filtering unit and a first digital gain input unit; the input end of the first analog gain input unit is electrically connected to the feedforward microphone; the input end of the first analog-to-digital conversion unit is electrically connected to the output end of the first analog gain input unit; the input end of the first filtering unit is electrically connected to the output end of the first analog-to-digital conversion unit; the input end of the first digital gain input unit is electrically connected to the output end of the first filtering unit, and the output end of the first digital gain input unit is electrically connected to the first noise reduction signal input end of the signal processing subcircuit; and / or, The second noise reduction sub-circuit includes a second analog gain input unit, a second analog-to-digital conversion unit, a second filtering unit and a second digital gain input unit; the input end of the second analog gain input unit is electrically connected to the feedback microphone; the input end of the second analog-to-digital conversion unit is electrically connected to the output end of the second analog gain input unit; the input end of the second filtering unit is electrically connected to the output end of the second analog-to-digital conversion unit; the input end of the second digital gain input unit is electrically connected to the output end of the second filtering unit, and the output end of the second digital gain input unit is electrically connected to the second noise reduction signal input end of the signal processing sub-circuit.

11. The ear-clip earphone according to claim 9, characterized in that: The signal processing subcircuit includes a first adder, a digital-to-analog conversion unit and an amplifier unit; The first input end of the first adder is electrically connected to the output end of the first noise reduction sub-circuit, and the second input end of the first adder is electrically connected to the output end of the second noise reduction sub-circuit; The input end of the digital-to-analog conversion unit is electrically connected to the output end of the first adder; The input end of the amplifier unit is electrically connected to the output end of the digital-to-analog conversion unit, and the output end of the amplifier unit is electrically connected to the speaker.

12. The ear-clip headphone according to claim 9, characterized in that: The control circuit also includes a music signal control subcircuit; The output end of the music signal control subcircuit is electrically connected to the music signal input end of the signal processing subcircuit.

13. The ear-clip headphone according to claim 12, characterized in that: The control circuit also includes a signal compensation subcircuit; The input end of the signal compensation subcircuit is electrically connected to the compensation output end of the music signal control subcircuit, and the output end of the signal compensation subcircuit is electrically connected to the compensation input end of the second noise reduction subcircuit.

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