A multi-unit frequency division bone conduction earphone

Abstract

The present invention discloses a multi-unit frequency-dividing bone conduction earphone, comprising an outer shell, an envelope, a flexible cap, an active vibrator, a passive vibrator, a mixing tube, a resonance chamber shell and a diaphragm; the outer shell is hook-shaped, narrow at both sides and wide in the middle; the envelope is located between the outer shell opening and the flexible cap, and the mixing tube in the envelope is equipped with an active vibrator and a passive vibrator; the sound window is an opening from the top of the outer shell to the inside, connecting the inside of the resonance chamber shell with the outside. The present invention has a simple structure, an independent mixing structure, and couples all the vibrators, so that the common-mode signal between the vibrators is enhanced, the differential-mode signal is reduced, and the signal-to-noise ratio reduction caused by its own defects and system noise is reduced, effectively solving the problems of low resolution, uneven frequency distribution, low audio fidelity, etc. existing in the bone conduction earphone.

Description

Technical Field

[0001] The present invention relates to the field of bone conduction earphones, in particular to a multi-unit frequency division bone conduction earphone. Background Art

[0002] People capture sound by vibrating the eardrum through air vibrations, which are then transmitted to the inner ear and converted into nerve impulses by structures such as the cochlea. Common diaphragm headphones are based on this principle. However, in recent years, bone conduction headphones have appeared on the market. These headphones directly vibrate the sound signal on the skull, and use the skull to send the vibrations into the inner ear, bypassing the process of air pushing the eardrum to vibrate. Compared with diaphragm headphones, they are less likely to cause damage to the eardrum to a certain extent.

[0003] However, most existing bone conduction headphones use vibrations to transmit sound into the ear along the direction from the ear cartilage to the skull. At the point where the earphone vibrator contacts the cartilage, the contact force varies from person to person due to the difference in the shape of the auricle. Poor contact at the conduction point directly affects the quality and efficiency of sound conduction.

[0004] Moreover, for diaphragm headphones, a certain stereo field effect can be artificially constructed by means of unit size and direction, which is closely related to the shape, position and head shape of the user's auricle. However, bone conduction headphones send sound directly into the inner ear, and the sound is not affected by the auricle, head, sound source direction and other factors, so it is more difficult to simulate a stereo field. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and provide a multi-unit frequency division bone conduction headset to solve the problems of low resolution, uneven frequency distribution, low audio fidelity, etc. existing in most bone conduction headsets. The technical solution used in the present invention is:

[0006] A multi-unit frequency-divided bone conduction headset comprises a shell, a cover, a flexible cap, an active vibrator, a control circuit and a battery pack, wherein a plurality of active vibrators are evenly fixed in the shell by a fixing sheet; a passive vibrator is fixed to the tail of the shell by glue coating; the lower surfaces of the control circuit and the battery pack are coated with glue and adhered to the central arc position of the bottom inner side of the shell; the cover is laid at the edge opening of the shell, and the inner opening of the cover is laid with a flexible cap along the arc direction of the shell; the cover and the shell, and the flexible cap and the cover are sealed by glue bonding.

[0007] A multi-unit frequency-divided bone conduction earphone comprises a sound window, a mixing tube, a resonance chamber shell and a diaphragm. After the active vibrator is fixed, the mixing tube contacts the bottom of all fixed active vibrators and is fixed under a first conduction block by applying glue; the passive vibrator is fixed to the end of the mixing tube by applying glue; the sound window is an opening facing inward at the top of the shell, which is connected to the resonance chamber shell; the diaphragm is placed in the resonance chamber shell, and is sealed with glue between the edge of the resonance chamber shell, the inner wall of the shell and the mixing tube.

[0008] A multi-unit frequency-dividing bone conduction earphone comprises a sound window, a mixing tube, a resonance cavity shell and a diaphragm. The sound window is an inward opening at the bottom end of the shell and is connected to the resonance cavity shell.

[0009] The active vibrator includes a first conduction block, an inner piezoelectric ceramic, a fixing plate, an outer piezoelectric ceramic, a gasket, a first spring fixing plate, a first limit spring, a first push rod and a piezoelectric ceramic electrode; the first conduction block is glued to the inner piezoelectric ceramic, the inner piezoelectric ceramic and the outer piezoelectric ceramic are symmetrically laid on both sides of the fixing plate, and the two piezoelectric ceramics are fixed to the fixing plate by gluing; the gasket is laid on the outer side of the outer piezoelectric ceramic and is glued to the first spring fixing plate; the first limit spring is fixed to the gasket through the first spring fixing plate, and the first push rod is inserted into the center of the first limit spring.

[0010] The passive vibrator includes a second conductive block, a second spring stator, a second limit spring and a second push rod; the second spring stator is glued to the outer side of the second conductive block, the second limit spring is fixed to the second conductive block through the second spring stator, and a second push rod is inserted into the center of the second limit spring.

[0011] The control circuit includes a main control chip module, a digital-to-analog converter, a memory, a decoder, a frequency divider, a unit driver and a sound unit.

[0012] The active vibrator receives the current signal from the control circuit to generate vibration, and transmits the vibration into the ear through the auricle cartilage; the mixing tube mixes the sounds of various frequencies inside the earphone, driving the diaphragm to vibrate, and the diaphragm amplifies the vibration and transmits the sound into the ear through the resonance cavity shell and the air; the sound window changes the opening position on the outer shell; the vibration generated by the active vibrator is changed from being conducted through the auricle cartilage to being conducted into the ear through the temporal bone.

[0013] A frequency division control method for a multi-unit frequency division bone conduction headset comprises the following steps:

[0014] After the main control chip module reads the digital audio signal in the memory, it converts the digital signal into an audio analog signal through a digital-to-analog converter. The analog signal is further divided by a divider. Each frequency domain analog signal output by the divider is amplified by the corresponding frequency generating unit driver, and the corresponding sound generating unit converts the amplified analog signal into sound.

[0015] A frequency division control method for a multi-unit frequency division bone conduction headset comprises the following steps:

[0016] After the main control chip module reads the digital audio signal in the memory, it preliminarily decodes the digital audio through the decoder, and further divides the signal through discrete Fourier transform. The multiple groups of digital signals after division are converted into analog signals through a multi-channel digital-to-analog converter and distributed to the unit driver of the corresponding frequency. The corresponding sound unit converts the amplified analog signal into sound.

[0017] The beneficial effects of the present invention are:

[0018] 1) The multi-unit design allows bone conduction headphones to have a wide and balanced sound range like multi-unit headphones;

[0019] 2) Two mixing methods, internal mixing (mixing tube) and external mixing (auricular mixing), were proposed to improve the flexibility of mixing;

[0020] 3) A design scheme combining bone conduction and acoustic conduction was proposed, which integrates the characteristics of the two acoustic conduction methods and reduces the loss and distortion of sound conduction at specific frequencies;

[0021] 4) Two bone conduction pathways for this type of bone conduction device through cartilage / temporal bone conduction were proposed;

[0022] 5) The mixing structure is independent and couples all oscillators, so that the common-mode signal between the oscillators is enhanced and the differential-mode signal is reduced, reducing the reduction in signal-to-noise ratio caused by its own defects and system noise;

[0023] 6) Each oscillator is responsible for a range of sound frequencies, allowing the user to individually control the current response of each frequency band from the software with low loss, achieving personalized adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an axonometric view of the appearance of a multi-unit frequency-dividing bone conduction headset of the present invention;

[0025] Figure 2 This is a front schematic diagram of the internal structure of a multi-unit frequency-dividing bone conduction earphone of the present invention;

[0026] Figure 3 This is a schematic diagram of the reverse side of the internal structure of a multi-unit frequency division bone conduction earphone of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of an active vibrator of a multi-unit frequency-dividing bone conduction earphone of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a passive vibrator of a multi-unit frequency-dividing bone conduction earphone of the present invention;

[0029] Figure 6 It is a flow chart of two control methods of a multi-unit frequency division bone conduction earphone control circuit of the present invention;

[0030] Figure 7 A schematic diagram of wearing a multi-unit frequency-dividing bone conduction headset according to the present invention;

[0031] In the figure: 1. outer shell; 2. envelope; 3. sound window; 4. flexible capping; 5. active vibrator; 51. conduction block; 52. inner piezoelectric ceramic; 53. fixing plate; 54. outer piezoelectric ceramic; 55. gasket; 56. spring stator; 57. limit spring; 58. push rod; 6. passive vibrator; 61. conduction block; 62. spring stator; 63. limit spring; 64. push rod; 7. mixing tube; 8. resonance chamber shell; 9. control circuit; 10. battery pack; 11. diaphragm. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] Example: See Figure 1-7 .

[0034] Embodiment 1:

[0035] A multi-unit frequency-divided bone conduction earphone comprises a shell 1, a cover 2, a flexible cap 4, an active vibrator 5, a control circuit 9 and a battery pack 10, wherein a plurality of active vibrators 5 are evenly fixed in the shell 1 by a fixing plate 53; a passive vibrator 6 is fixed to the tail of the shell 1 by glue coating; the lower surfaces of the control circuit 9 and the battery pack 10 are coated with glue and adhered to the central arc position of the bottom inner side of the shell 1; the cover 2 is laid at the edge opening of the shell 1, and the inner opening of the cover 2 is laid with a flexible cap 4 along the arc direction of the shell 1; the cover 2 and the shell 1, and the flexible cap 4 and the cover 2 are sealed by glue bonding.

[0036] Each beam of current signal after frequency division, conversion and amplification is passed to each active vibrator 5 of the corresponding frequency. The active vibrator 5 transmits the vibration to the auricle cartilage. The auricle gathers the vibration of each vibrator, generates frequency mixing, and transmits the vibration to the inner ear through bone conduction to produce hearing.

[0037] Embodiment 2:

[0038] A multi-unit frequency-divided bone conduction earphone, based on the earphone structure described in Example 1, further includes a sound window 3, a mixing tube 7, a resonance chamber shell 8 and a diaphragm 11. After the active vibrator 5 is fixed, the mixing tube 7 contacts the bottom of all fixed active vibrators 5 and is fixed under the first conduction block 51 by gluing; the passive vibrator 6 is fixed to the end of the mixing tube 7 by gluing; the sound window 3 is an opening facing inward at the top of the shell 1, which is connected to the resonance chamber shell 8; the diaphragm 11 is placed in the resonance chamber shell 8, and is sealed with glue between the edge of the resonance chamber shell 8, the inner wall of the shell 1 and the mixing tube 7.

[0039] In this embodiment, a mixing tube 7 is added on the basis of the earphone structure described in Embodiment 1. The mixing tube 7 mixes sounds of various frequencies inside the earphone, pushing the diaphragm 11 to vibrate. The diaphragm 11 amplifies the vibration and then reflects the sound through the resonance cavity shell 8 and transmits it to the ear through the air. Therefore, the sound conduction method of the earphone structure of this embodiment is a composite conduction method of bone conduction and acoustic conduction.

[0040] Embodiment 3:

[0041] A multi-unit frequency-divided bone conduction earphone, based on the earphone structure described in Example 1, comprises a sound window 3, a mixing tube 7, a resonance chamber shell 8 and a diaphragm 11. After the active vibrator 5 is fixed, the mixing tube 7 contacts the bottom of all fixed active vibrators 5 and is fixed under the first conduction block 51 by gluing; the passive vibrator 6 is fixed to the end of the mixing tube 7 by gluing; the sound window 3 is an opening facing inward at the bottom end of the shell 1, which is connected to the resonance chamber shell 8; the diaphragm 11 is placed in the resonance chamber shell 8, and is sealed with glue between the edge of the resonance chamber shell 8, the inner wall of the shell 1 and the mixing tube 7.

[0042] The earphone structure described in this embodiment is the same as the earphone structure described in Embodiment 2, but the sound window 3 is opened at the bottom end of the housing 1. At this time, the active vibrator 5 transmits the vibration to the temporal bone instead of the auricle cartilage.

[0043] Embodiment 4:

[0044] like Figure 7 As shown, the earphone is worn on the inner side of the auricle, the hook-shaped shell is naturally suspended, the flexible cap 4 fits the auricle, and the sagittal angle is adjusted so that the sound can directly enter the ear canal from the sound window 3; turn on the earphone, the control circuit 9 connects to the player through Bluetooth, wireless LAN, etc., and receives audio file data from the player, and the data is converted into vibration of the active vibrator 5 after processing;

[0045] The active vibrator 5 receives the current signal from the control circuit 9 to generate vibration, and transmits the vibration into the ear through the auricle cartilage; the mixing tube 7 mixes the sounds of various frequencies inside the earphone, driving the diaphragm 11 to vibrate, and the diaphragm 11 amplifies the vibration and transmits the sound into the ear through the resonance cavity shell 8 and the air; the sound window 3 changes the opening position on the outer shell 1; the vibration generated by the active vibrator 5 is changed from being conducted through the auricle cartilage to being conducted into the ear through the temporal bone.

[0046] like Figure 6 As shown, the control circuit 9 includes a main control chip module, a digital-to-analog converter, a memory, a decoder, a frequency divider, a unit driver and a sound unit.

[0047] A frequency division control method for a multi-unit frequency division bone conduction headset comprises the following steps:

[0048] After the main control chip module reads the digital audio signal in the memory, it converts the digital signal into an audio analog signal through a digital-to-analog converter. The analog signal is further divided by a divider. Each frequency domain analog signal output by the divider is amplified by the corresponding frequency generating unit driver, and the corresponding sound generating unit converts the amplified analog signal into sound.

[0049] A frequency division control method for a multi-unit frequency division bone conduction headset comprises the following steps:

[0050] After the main control chip module reads the digital audio signal in the memory, it preliminarily decodes the digital audio through the decoder, and further divides the signal through discrete Fourier transform. The multiple groups of digital signals after division are converted into analog signals through a multi-channel digital-to-analog converter and distributed to the unit driver of the corresponding frequency. The corresponding sound unit converts the amplified analog signal into sound.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A multi-unit frequency division bone conduction headset, characterized in that: The invention comprises an outer shell (1), an envelope (2), a flexible top seal (4), an active vibrator (5), a control circuit (9) and a battery pack (10), wherein a plurality of active vibrators (5) are evenly fixed in the outer shell (1) by means of a fixing plate (53); a passive vibrator (6) is fixed to the rear of the outer shell (1) by means of glue coating; the lower surfaces of the control circuit (9) and the battery pack (10) are coated with glue and adhered to the central arc position of the bottom inner side of the outer shell (1); the envelope (2) is laid at the edge opening of the outer shell (1), and the inner opening of the envelope (2) is laid with a flexible top seal (4) along the arc direction of the outer shell (1); the envelope (2) and the outer shell (1), and the flexible top seal (4) and the envelope (2) are sealed by means of glue bonding; The multi-unit frequency-dividing bone conduction earphone further comprises a sound window (3), a mixing tube (7), a resonance chamber shell (8) and a diaphragm (11); after the active vibrator (5) is fixed, the mixing tube (7) contacts the bottom of all the fixed active vibrators (5) and is fixed under the first conduction block (51) by applying glue; the passive vibrator (6) is fixed to the end of the mixing tube (7) by applying glue; the sound window (3) is an opening facing inward at the top of the shell (1) and is connected to the resonance chamber shell (8); the diaphragm (11) is placed in the resonance chamber shell (8) and is sealed with glue between the edge of the resonance chamber shell (8), the inner wall of the shell (1) and the mixing tube (7); The sound window (3) is an inward opening at the bottom of the outer shell (1) and is connected to the resonance chamber shell (8); The active vibrator (5) comprises a first conductive block (51), an inner piezoelectric ceramic (52), a fixing plate (53), an outer piezoelectric ceramic (54), a gasket (55), a first spring fixing plate (56), a first limit spring (57), a first push rod (58) and a piezoelectric ceramic electrode (59); the first conductive block (51) is glued to the inner piezoelectric ceramic (52); the inner piezoelectric ceramic (52) and the outer piezoelectric ceramic (54) are symmetrically laid on both sides of the fixing plate (53); the two piezoelectric ceramics are fixed to the fixing plate (53) by gluing; the gasket (55) is laid on the outer side of the outer piezoelectric ceramic (54) and is glued to the first spring fixing plate (56); the first limit spring (57) is fixed to the gasket (55) through the first spring fixing plate (56); the first push rod (58) is inserted into the center of the first limit spring (57); The passive vibrator (6) comprises a second conductive block (61), a second spring stator (62), a second limit spring (63) and a second push rod (64); the second spring stator (62) is glued to the outer side of the second conductive block (61), the second limit spring (63) is fixed to the second conductive block (61) via the second spring stator (62), and the second push rod (64) is inserted into the center of the second limit spring (63); The active vibrator (5) receives the current signal from the control circuit (9) to generate vibration, and transmits the vibration into the ear through the auricular cartilage; the mixing tube (7) mixes the sounds of various frequencies inside the earphone, driving the diaphragm (11) to vibrate, and the diaphragm (11) amplifies the vibration and transmits the sound into the ear through the resonance cavity shell (8) and the air; the sound window (3) changes the opening position on the shell (1); the vibration generated by the active vibrator (5) is changed from being transmitted through the auricular cartilage to being transmitted into the ear through the temporal bone.

2. According to the multi-unit frequency division bone conduction earphone described in claim 1, it is characterized in that: The control circuit (9) comprises a main control chip module, a digital-to-analog converter, a memory, a decoder, a frequency divider, a unit driver and a sound unit.

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