CN111791775A - Structure and control method of high-tone bone conduction seat headrest - Google Patents
Structure and control method of high-tone bone conduction seat headrest Download PDFInfo
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- CN111791775A CN111791775A CN201910952723.4A CN201910952723A CN111791775A CN 111791775 A CN111791775 A CN 111791775A CN 201910952723 A CN201910952723 A CN 201910952723A CN 111791775 A CN111791775 A CN 111791775A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/80—Head-rests
- B60N2/879—Head-rests with additional features not related to head-rest positioning, e.g. heating or cooling devices or loudspeakers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R2011/0001—Arrangements for holding or mounting articles, not otherwise provided for characterised by position
- B60R2011/0003—Arrangements for holding or mounting articles, not otherwise provided for characterised by position inside the vehicle
- B60R2011/0012—Seats or parts thereof
- B60R2011/0017—Head-rests
Abstract
The invention discloses a structure of a high-tone bone conduction seat headrest, which comprises a headrest main body consisting of a headrest skin and a headrest inner core in the headrest skin, wherein an electric vibration device is arranged on the headrest main body at a position corresponding to the head of a human body and is in signal connection with an audio control unit, and the structure is characterized in that: this audio control unit still simultaneously with at least one supplementary loudspeaker signal connection of air conduction formula, this audio control unit transmits sound source audio signal for the electric vibration device and produces the bone conduction main part sense of hearing, to the supplementary loudspeaker transmission of air conduction formula simultaneously supplementary audio signal upgrading bone conduction main part tone quality of hearing, the control method supporting with this structure is: the audio control unit acquires external audio signals, transmits the audio signals of the sound source to the electric vibration device to generate auditory sensation of the bone conduction main body, performs corresponding processing on the external audio signals to generate auxiliary audio signals, transmits the auxiliary audio signals to the air-conduction type auxiliary horn at the corresponding position, and performs tone quality upgrading on the auditory sensation of the bone conduction main body from the air-conduction path.
Description
Technical Field
The invention relates to a structure and a control method of a high-tone bone conduction seat headrest, which are mainly used in the application fields of vehicle-mounted hands-free telephone answering, music answering, man-machine interaction and the like for drivers and passengers in vehicles.
Background
Prior application ZL201420259874.4 has disclosed a personal hearing device for vehicles, which is capable of transmitting mechanical waves of sound wave vibration to the auditory system of a user through the skull bone by means of an electric vibration device installed in a headrest of a seat, and other people cannot transmit the mechanical waves of sound wave vibration to other people because the head cannot be in contact with the electric vibration device of the headrest of the seat, and thus other people cannot hear theoretically, thereby solving the problem that passengers individually hear different audios while interfering with each other. The bone conduction seat headrest of the prior application ZL201420259874.4 has the disadvantage of poor sound quality. In order to improve the sound quality of the existing bone conduction seat headrest, people can only achieve the aim of improving the structure of an electric vibration device arranged in the bone conduction seat headrest so as to have better frequency performance, because the bone conduction seat headrest has the characteristic of private listening, therefore, only the bone conduction technology with point-to-point private transmission characteristic can be used on the bone conduction seat headrest in the prior art, therefore, people always improve the frequency response characteristics of the electric vibration device, and various electric vibration devices with different specifications and performances are produced at present, but the problems that the frequency response performance is improved by developing a novel high-tone quality electric vibration device or improving the self structure of the electric vibration device are extremely difficult in technology, the actual tone quality is not obviously improved, therefore, the general tone quality of the existing bone conduction seat headrest product is not good, and a novel high-tone-quality bone conduction seat headrest is urgently needed to be researched and developed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a structure and a control method of a high-sound-quality bone conduction seat headrest, which has better sound quality than the existing bone conduction seat headrest and can maintain the privacy characteristics of the bone conduction seat headrest.
The utility model provides a structure of high tone quality bone conduction seat headrest, it constitutes this headrest main part by headrest covering and the headrest inner core in this headrest covering, installs electric vibration device to the position of human head in this headrest main part, and this electric vibration device and audio control unit signal connection, characterized by: the audio control unit is also connected with at least one air-conduction auxiliary horn signal, transmits sound source audio signals to the electric vibration device to generate bone conduction hearing as a hearing main body, and transmits auxiliary audio signals to the air-conduction auxiliary horn to upgrade the tone quality of the bone conduction main body hearing generated by the electric vibration device.
As an improvement scheme to the structure, the structure is characterized in that: the air-guide auxiliary horn mounted on the headrest main body is composed of a vibrating body embedded in the elastic sponge layer and a vibrating surface layer covered on the elastic sponge layer.
As an improvement scheme to the structure, the structure is characterized in that: the air-guiding auxiliary horn is a directional speaker, and the optimal installation position of the air-guiding auxiliary horn is in the ceiling area of the carriage above the top of the head of a user, and the sound emission direction of the air-guiding auxiliary horn is directed to the ear of the user.
A control method of a high-tone bone conduction seat headrest is characterized by comprising the following steps:
step S1: the audio control unit acquires an external audio signal, wherein the external audio signal at least comprises a sound source audio signal;
step S2: the audio control unit transmits the audio signal of the sound source to the electric vibration device; at the same time
Step S3: the audio control unit correspondingly processes the acquired external audio signals to generate corresponding auxiliary audio signals required by upgrading the hearing of the bone conduction main body from the air conduction path;
step S4: the audio control unit transmits the auxiliary audio signal to an air-guide auxiliary loudspeaker at a corresponding position;
step S5: the auxiliary audio signal sent by the air-conduction auxiliary loudspeaker is synchronously transmitted to a user listening to the bone-conduction main hearing generated by the electric vibration device through an air-conduction path, so that the tone quality of the bone-conduction main hearing is upgraded.
As an improvement to the above control method, the method is characterized in that: step S3 is to process the input external audio signal, specifically, the audio control unit performs phase inversion on the phase of the environmental noise signal to generate an audio signal with the same waveform and the opposite phase as the environmental noise waveform as an auxiliary audio signal, and transmits the audio signal to the air-conduction auxiliary speaker to cancel the environmental noise, so that the signal-to-noise ratio of the bone conduction subject generated by the electric vibration device is improved, and the sound quality is clearer.
As an improvement to the above control method, the method is characterized in that: step S3 is to process the input external audio signal, specifically, the audio control unit extracts the audio signal in the surround channel in the sound source audio signal as the sound image localization signal in the auxiliary audio signal, and defines and transmits the sound image localization signal to the air-guide auxiliary speaker at the corresponding position according to the position of the original channel of the sound image localization signal.
As an improvement to the above control method, the method is characterized in that: step S3 is to process the input external audio signal, specifically, the audio control unit extracts the audio signal of the time difference portion as the sound image localization signal in the auxiliary audio signal according to the time difference between the audio signals of the left channel and the right channel in the sound source audio signal, and transmits the audio signal to the air-guided auxiliary speaker at the corresponding position according to the position definition of the original channel of the sound image localization signal.
As an improvement to the above control method, the method is characterized in that: step S3 is to process the input external audio signal, specifically, the audio control unit extracts an audio component contained in a frequency spectrum segment of the sound source audio signal that exceeds the frequency response characteristic range of the electric vibration device and an audio component contained in a frequency spectrum segment of a frequency response curve valley segment of the electric vibration device in the sound source audio signal, and both of the two audio components are used as auxiliary audio signals and are transmitted to the air-guide auxiliary speaker at a corresponding position according to the position definition of the original channel of the auxiliary audio signal.
As an improvement to the above control method, the method is characterized in that: step S3 is to process the input external audio signal, specifically, the audio control unit filters, delays, attenuates, and nests the audio signal of the sound source to generate an auxiliary audio signal, and transmits the auxiliary audio signal to the air-guide auxiliary speaker at the corresponding position.
As an improvement to the above control method, the method is characterized in that: step S3 is to process the input external audio signal, specifically, the loudness of the auxiliary audio signal output by the air-guide auxiliary speaker and the loudness of the sound source audio signal output by the electric vibration device are both adjusted in proportion to the change in loudness of the ambient noise by the audio control unit.
The beneficial effects of the invention are as follows: the structure and the control method of the high-tone bone conduction seat headrest thoroughly subvert the traditional research and development concept of the prior bone conduction seat headrest. If the sound quality of the bone conduction seat headrest in the prior art needs to be improved, the traditional technical route for improving the frequency performance of the electric vibration device is followed, and the invention develops a new technical route which is completely opposite to the traditional technical route: that is, the first application of a conventional air conduction speaker in the present headrest product may destroy the transmission advantages of the bone conduction privacy, and obviously, this approach has broken the tradition and forbidden areas of the existing bone conduction audio technology. The scheme is characterized by being different from the prior art: although the scheme still uses the bone conduction auditory sense generated by the electric vibration device as the auditory sense main body, the scheme does not rely on the improvement of the self frequency performance of the electric vibration device to improve the tone quality and the auditory sense, but uses the air conduction type auxiliary loudspeaker to transmit some auxiliary audio signals through the air conduction path to upgrade the auditory tone quality of the bone conduction main body when the electric vibration device generates the auditory sense of the bone conduction main body, thereby forming a brand new bone conduction seat headrest technology of a bone-air composite path reverberation structure which is not existed in the prior bone conduction seat headrest technology. Because the auxiliary audio signal sent by the air-guide auxiliary loudspeaker and the bone-guide main body hearing generated by the electric vibration device simultaneously send the main body hearing signal and the auxiliary audio signal to the hearing system of the user from two paths, the user can obtain richer and more complete audio information and tone quality improvement compared with the traditional single bone-guide transmission; meanwhile, because the auxiliary audio signals sent out from the air conduction transmission path of the patent are only some processed environmental noise signals, sound image positioning signals, audio components of frequency response curve segments and the like, obviously, the auxiliary audio signals are not sound source audio signals, are greatly different from the sound source audio signals, and can not completely carry specific audio contents in the sound source audio signals, so that the auxiliary audio signals can only play a role of modifying the main auditory sense generated by the sound source audio signals on a bone conduction path to improve the sound quality and can not be used for carrying the complete audio contents of the sound source audio signals, even if the auxiliary audio signals are heard by other people when being conducted out by the air conduction auxiliary horn through the air, the other people still can not know what the specific contents of the sound source audio signals in the other bone conduction path are, because the sound source audio signal transmitted in the bone conduction path can be heard only by a person leaning against the headrest, the technology of the patent can improve the tone quality and simultaneously keep the privacy of the bone conduction seat headrest product, thereby realizing the purpose of the invention.
Drawings
FIG. 1 is a schematic diagram of the structure scheme of the patent;
FIG. 2 is a schematic diagram of the signal connection principle of the present patent;
FIG. 3 is a schematic structural view of a skin vibration type air conduction audio unit employed by the air conduction type auxiliary horn of the present patent;
fig. 4 is a flowchart of a control method of the present patent.
The reference numbers are as follows: 1. the headrest comprises a headrest cover, 2 parts of a headrest inner core, 3 parts of an electric vibration device, 4 parts of an audio control unit, 5 parts of an air-guide type auxiliary horn, 6 parts of an elastic sponge layer, 7 parts of a vibration body and 8 parts of a vibration surface layer.
Detailed Description
The structure of a high-tone bone conduction seat headrest is shown in the attached figure 1, and the high-tone bone conduction seat headrest comprises a headrest skin 1 and a headrest inner core 2 in the headrest skin 1, wherein an electric vibration device 3 is arranged at a position on the headrest main body corresponding to the head of a human body, and the electric vibration device 3 is in signal connection with an audio control unit 4, and is characterized in that: as shown in fig. 2, the audio control unit 4 is also in signal connection with at least one air-conduction auxiliary speaker 5, the audio control unit 4 transmits a sound source audio signal to the electric vibration device 3 to generate a bone-conduction hearing sense as a hearing sense main body, and the audio control unit 4 also transmits an auxiliary audio signal to the air-conduction auxiliary speaker 5 to upgrade the sound quality of the bone-conduction hearing sense main body generated by the electric vibration device 3. The sound quality upgrade refers to the improvement of the user's auditory sense. The present configuration needs to match a corresponding control method, and is specifically controlled by a digital signal processor inside the audio control unit 4 according to the control method described below. The air-guide auxiliary horn 5 in the structural scheme can be a common horn commonly used for a television or a sound, and can also be other types of audio units taking air as a conducting medium, such as horn horns, array speakers, ultrasonic parametric speakers and other various directional speakers, skin vibration type air-guide audio units and the like. In the scheme, the air-guide auxiliary horn 5 can be arranged on the headrest main body or the backrest of the seat, or can be arranged on any position around the seat, such as the inner wall of a carriage, the roof and the like, and the installation quantity is at least one, and is determined by specific design.
As a further improvement of the above configuration, the headrest body and the air-guide auxiliary horn 5 in the present modification are characterized in that: at least one air guide type auxiliary horn 5 is respectively arranged at the left side and the right side of the vertical plane in the headrest main body. For example, it is preferable to mount two air-guide auxiliary speakers 5 on the left and right edges of the front surface of the headrest body, respectively; of course, the air-guide auxiliary speakers 5 may be installed at the left and right side positions of the headrest body or installed separately from the headrest body, for example, a pair number of air-guide auxiliary speakers 5 may be symmetrically installed at the left and right edges of the seat back; certainly, the air-guide auxiliary horn 5 can be connected with the audio control unit 4 through a signal line and then respectively arranged on the inner walls of the carriages at two sides of the seat, and the specific installation positions comprise the inner sides of a left door and a right door, a left column A, a right column B, a left column C, a right column C and the like, so that the air-guide auxiliary horn 5 is equivalently installed at the subdivided positions of the headrest main body, such as the left front, the right front, the left middle, the right middle, the left rear, the right rear and the like, and the existing sound system of the automobile can be directly shared by the mounted horns at the positions of the column A, the column B and the like, so that the hardware cost. In short, the specific mounting structure may be modified in various ways as long as at least one air guide type auxiliary horn 5 is provided on each of the left and right sides of the vertical plane in the headrest body according to the present modification.
As a further improvement of the above configuration, the air-guide auxiliary speakers 5 mounted on the headrest body on both sides of the central vertical plane of the headrest body are located outside the ear projection areas on the front surface of the headrest body, which is more effective in improving the sound quality. That is, the optimum mounting position of the air-guide auxiliary horn 5 mounted on the headrest body at this time is a position outside the ear projection area on the front of the headrest body, which means that the mounting position of the air-guide auxiliary horn 5 at this time cannot be blocked by the auricle.
As another lower-cost improvement to the above structural solution, the structural features of the headrest body and the air-guide auxiliary horn 5 in the present solution are: at least one air-guide auxiliary horn 5 is arranged on the vertical surface of the headrest main body. The specific mounting positions pointed by the middle vertical plane comprise: an instrument desk right in front of the headrest body, a roof right above the headrest body, a position of the roof right above the headrest body, which is forward or backward, a position of the seat back right below the headrest body, and the like.
As another lower cost modification to the above structural solution, as shown in fig. 3, the air-conduction auxiliary horn 5 mounted on the headrest main body is composed of a vibrating body 7 embedded in the elastic sponge layer 6 and a vibrating surface layer 8 covering the elastic sponge layer 6, which is the skin vibration type air-conduction audio unit described in the above structural solution. The elastic sponge layer 6 can be a piece of latex sponge which is independently embedded into the sponge layer of the headrest inner core 2, or the sponge filler layer which forms the headrest inner core 2 can be directly adopted to serve as the elastic sponge layer 6 to embed the vibrating body 7 into the elastic sponge layer. The vibrator 7 may be an electromagnetic vibration voice coil unit of a commercially available horn, a piezoelectric ceramic, a vibration motor, or the like. The vibration surface layer 8 can be any one of a single layer of textile fabric, a leather fabric, a composite material vibration diaphragm and the like, and can also be a natural sponge surface layer which is directly covered by the headrest skin 1 covered outside the headrest inner core 2 of the headrest main body or directly utilizes the sponge layer of the headrest inner core 2 during foaming processing. The elastic sponge layer 6 plays a role in elastically fixing the vibration surface layer 8, the vibration body 7 plays a role in driving the vibration surface layer 8 to vibrate in an audio frequency mode, and the vibration surface layer 8 drives air to vibrate to generate air conduction hearing; certainly, because the vibration surface layer 8 is located on a part of the surface of the front face of the headrest and can be in direct contact with the head, a part of audio vibration is directly conducted to the skull, and therefore the vibration surface layer 8 can also generate a part of bone conduction hearing, and the sound quality of the headrest is more layered.
As a further improvement to the above structure, in order to further improve the privacy characteristics of the product, the air-guiding auxiliary horn 5 is a directional speaker, such as an array speaker, a horn speaker, an ultrasonic parametric speaker, etc., which is optimally installed in the ceiling area above the head of the user and whose sound emission direction is directed toward the ears of the user, so as to minimize the reflection caused by the automobile glass and the influence on other passengers; of course, the directional loudspeaker may be mounted in other positions and directed away from the user's ear as appropriate, depending on the design, if not desired for optimum performance. In this solution the sound emitted by the directional loudspeaker is clearly directed better than a normal loudspeaker, and therefore the sound radiation energy leaking into the surrounding environment is smaller, so that the privacy properties of the product are further improved.
A method for controlling a high-quality bone conduction seat headrest is shown in fig. 4, and is characterized in that:
step S1: the audio control unit 4 acquires an external audio signal including at least a sound source audio signal;
step S2: the audio control unit 4 transmits the sound source audio signal to the electric vibration device 3; at the same time
Step S3: the audio control unit 4 correspondingly processes the acquired external audio signals to generate corresponding auxiliary audio signals required for upgrading the hearing of the bone conduction main body from the air conduction path;
step S4: the audio control unit 4 transmits the auxiliary audio signal to the air-guide auxiliary loudspeaker 5 at the corresponding position;
step S5: the auxiliary audio signal sent by the air-conduction auxiliary loudspeaker 5 is synchronously transmitted to a user listening to the bone-conduction main hearing generated by the electric vibration device 3 through an air-conduction path, so that the tone quality of the bone-conduction main hearing is upgraded.
The tone quality upgrading in the control method refers to the improvement of the auditory perception of a user, namely, the patent can enable the user to hear better sound, such as higher signal-to-noise ratio, stronger stereoscopic impression, higher reduction degree, better telepresence and the like.
As a further improvement of the above control method, the control method for improving the sound signal-to-noise ratio is: the external audio signal acquired by the audio control unit 4 in step S3 includes, in addition to the sound source audio signal, an environmental noise signal acquired from an audio acquisition device such as a microphone or a sound pickup signal connected to the audio control unit 4. The audio control unit 4 samples the acquired environmental noise signal and performs inverse processing through fourier transform to generate an auxiliary audio signal with the same waveform and opposite phase with the environmental noise, the auxiliary audio signal is transmitted to the air-guide auxiliary loudspeaker 5, the sound wave played by the auxiliary audio signal is superposed with the waveform of the environmental noise when the sound wave is propagated in the air, and the ambient noise heard by human ears is reduced because the two sound waves have the same waveform and opposite phases and the vector sum approaches zero, that is, the environmental noise is offset and weakened; meanwhile, the audio control unit 4 plays the sound source audio signal on the bone conduction path through the electric vibration device 3, and the bone conduction path and the air conduction path of the air are not affected by each other due to different transmission paths, so that the sound source audio signal transmitted in the bone conduction path cannot be reduced, that is, the sound source audio signal heard by the user is unchanged in size, only the environmental noise signal is reduced, the signal-to-noise ratio is inevitably improved, the signal-to-noise ratio is improved to represent that the definition is improved, and the tone quality is improved, so that the auditory sensation of the user is upgraded. In order to achieve the optimal effect of the above-mentioned opposite-phase sound wave on counteracting the ambient noise signal, the audio control unit (4) also needs to deliver the auxiliary audio signal to the air-guide auxiliary horn (5) at the corresponding position according to the sound source direction of the ambient noise signal, for example, to deliver the auxiliary audio signal to the air-guide auxiliary horn (5) installed in the same or similar direction. In addition, the external audio signal acquired by the audio control unit 4 may include, in addition to the sound source audio signal and the ambient noise signal, audio signals played by other audio playing devices, such as a traditional car-mounted sound from the car, other playing channels from the car-mounted multimedia system of the car, sounds leaked from other bone conduction seat headrests of the car, and the like, which belong to the ambient noise signal for users of the high-sound quality bone conduction seat headrests and also reduce the signal-to-noise ratio of the users, so the audio control unit 4 of the high-sound quality bone conduction seat headrest also treats these audio signals as ambient noise signals to be processed together, and the audio control unit 4 may acquire such audio signals of the other audio playing devices through a signal line direct connection, and the signal quality of the audio signals is obviously better than that acquired by a microphone, so the effect of improving the signal-to-noise ratio will be better.
As a further improvement of the above control method, a control method for improving the stereoscopic effect of sound is: the audio control unit 4 in step S3 extracts the audio signal in the surround channel in the sound source audio signal as the sound image localization signal in the auxiliary audio signal, and transmits the sound image localization signal to the air-guide auxiliary speaker 5 at the corresponding position according to the position definition of the original channel of the sound image localization signal, and the air-guide auxiliary speaker 5 plays the sound image localization signal through the air-guide path, so that the bone-conduction main body auditory sense generated by the electric vibration device 3 has a stronger stereoscopic impression, and the bone-conduction main body auditory sense tone quality is upgraded. The sound source audio signal comes from the audio part of music or film, because they are made according to the existing surround sound industry standard, for example, industry standards such as "dolby directional logic II" and "dolby digital" transmit surround sound signals through independent left surround channel and right surround channel, so in this control scheme the audio control unit 4 can extract the audio signals in the two surround channels respectively, then use them as the sound image localization signals in the auxiliary audio signal of this control method and transmit them to the air-guide auxiliary loudspeakers 5 at the corresponding positions, at this time, at least one air-guide auxiliary loudspeaker 5 is respectively arranged at the left and right side positions of the vertical plane in the headrest main body, so that the left and right two sets of sound image localization signals extracted from the left and right surround channels can be transmitted to the corresponding air-guide auxiliary loudspeakers 5 at the left and right sides respectively, this is the corresponding position relationship between the sound image localization signal and the air-guide auxiliary horn 5; for another example, if the sound source audio signal is made according to the industry standard of "dolby surround sound", the sound source audio signal will only include a single surround channel according to the "dolby surround sound" standard, at this time, the audio control unit 4 can only extract a group of sound image localization signals from the single surround channel, and at this time, the air-guided auxiliary speaker 5 corresponding to the position of the sound image localization signals refers to the air-guided auxiliary speaker 5 mounted on the vertical plane in the headrest main body in the foregoing structural solution. The above two embodiments are both the case where the sound image localization signal physically corresponds to the positional relationship of the air-guide auxiliary horn 5, and are also the most ideal case; however, if the sound source audio signal is made by the dolby surround sound standard with only a single surround sound channel, but the matching physical structure of the headrest adopts the scheme that the air-conduction auxiliary speakers 5 are installed on the left and right sides of the vertical plane in the headrest main body, the control method of the audio control unit 4 is correspondingly adjusted to transmit the only one set of sound image localization signals to the air-conduction auxiliary speakers 5 arranged on the left and right sides of the vertical plane in the headrest main body simultaneously, so that the air-conduction auxiliary speakers 5 on the left and right sides of the vertical plane emit the same sound, thus the same position effect as that of the air-conduction auxiliary speakers 5 arranged on the vertical plane in the headrest main body can be simulated, and the essence of the control method at this time is to simulate the sound image localization signal playing effect of the air-conduction auxiliary speakers 5 at the virtual position by using the air-conduction auxiliary speakers 5 at other physical positions, obviously, the essence of the method is still the technical solution for enhancing the sound stereoscopic impression of the product after the sound image localization signal is transmitted to the air-guide auxiliary speaker 5 at the corresponding position for playing, and therefore, the three examples all belong to the protection scope of the control method.
The other control method for improving the sound stereoscopic impression of the product comprises the following steps: the audio control unit 4 described in step S3 extracts the difference between the left channel and the right channel of the sound source audio signal according to the time difference between the sound signals as a sound image localization signal in the auxiliary audio signal, and transmits the sound image localization signal to the air-guide auxiliary horn 5 at the corresponding position. At this time, at least one air-guide auxiliary horn 5 needs to be provided on each of the left and right sides of the vertical plane in the headrest body. The audio control unit 4 extracts the audio signal sent out earlier according to the time difference between the left channel signal and the right channel signal to serve as an auxiliary audio signal and transmits the auxiliary audio signal to the air-guide auxiliary loudspeaker 5 on the same side, so that the sound image positioning signal corresponds to the air-guide auxiliary loudspeaker 5 in position. When the sound image localization signal is played through the air-guide auxiliary speaker 5, the playing time is controlled to be within 50ms, which is the best effect, and of course, the playing time can be prolonged or shortened according to the specific design requirement. The sound image localization signal in the auxiliary audio signal is transmitted to a user who is listening to the hearing of the bone-conduction main body synchronously through the air-conduction path, so that the sound is more three-dimensional.
As a further improvement of the above control method, a control method for improving the sound reproduction degree is: the audio control unit 4 described in step S3 extracts the audio component contained in the frequency spectrum segment of the sound source audio signal that exceeds the frequency response characteristic range of the electric vibration device 3 and the audio component contained in the frequency spectrum segment of the sound source audio signal that corresponds to the frequency response curve valley segment of the electric vibration device 3, and these two audio components are both used as auxiliary audio signals and are transmitted to the air-guide auxiliary speaker 5 at the corresponding position according to the position definition of the original sound channel of the auxiliary audio signal. That is to say, the control method is to compensate the insufficient frequency response performance and the excessive frequency response performance when the air-guide auxiliary loudspeaker 5 transmits the audio frequency to the bone-guide path of the electric vibration device 3 through the air-guide auxiliary loudspeaker 5, so that the high-tone bone-conduction seat headrest has higher restoration degree to the audio signal of the sound source, and the tone quality is better. In the control method, when the audio control unit 4 extracts the auxiliary audio signal and transmits the auxiliary audio signal to the air-guide auxiliary speaker 5, the auxiliary audio signal still needs to be defined and transmitted to the air-guide auxiliary speaker 5 at the corresponding position according to the position of the channel where the auxiliary audio signal originally locates, for example, the auxiliary audio signal extracted from the left channel of the sound source audio signal still needs to be transmitted to the air-guide auxiliary speaker 5 installed at the left side, so the effect is best; of course, if the audio signals in the left and right channels of the audio signal of the sound source are identical, the correspondence relationship according to the position is not required.
As a further improvement of the above control method, a control method for improving the presence feeling is: the audio control unit 4 in step S3 extracts the sound source audio signal, performs filtering, delaying, attenuating, and nesting processing on the sound source audio signal, generates an auxiliary audio signal, and transmits the auxiliary audio signal to the air-guide auxiliary speaker 5 at the corresponding position. When the audio control unit 4 extracts and processes the audio signal of the sound source, it may extract and process only a certain sound channel in the audio signal of the sound source, or may perform the above signal processing on all the sound channels of the audio signal of the sound source; of course, the processing contents such as signal inversion and left and right channel transposition can be added, which is determined by design. The auxiliary audio signal processed by the above-mentioned processing can improve the telepresence of the hearing of the bone conduction main body through the playing of the air conduction type auxiliary loudspeaker 5, so that the hearing feeling is better.
As a further improvement on the control method, the control method for improving the adaptability of the product to the noise environment comprises the following steps: the loudness of the auxiliary audio signal output by the air-guide auxiliary speaker 5 and the loudness of the sound source audio signal output by the electric vibration device 3 by the audio control unit 4 in step S3 are both adjusted in proportion to the change in the loudness of the ambient noise. For example, when the loudness of the ambient noise becomes high, the audio control unit 4 increases the output power to the air-guide auxiliary speaker 5 and the electric vibration device 3 in proportion to increase the loudness, so that the audio signal heard by a person is not covered by the suddenly high ambient noise and cannot be heard; for another example, when the ambient noise is reduced, the audio control unit 4 will also reduce the output power of the air-guide auxiliary speaker 5 and the electric vibration device 3 to reduce the loudness, thereby avoiding causing ear discomfort, and at the same time, reducing sound leakage and reducing the possibility of the private audio content being heard by people nearby. The channel for the audio control unit 4 to acquire the ambient noise loudness data may come from other ambient noise loudness detection devices, or may come from a microphone or a sound pickup, etc. connected to the audio control unit 4 by signals.
The above control methods may be used alone or in combination, and are specifically determined by design.
Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation, the embodiments being further modified and varied as will be apparent to those skilled in the art in light of the disclosure and description herein. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and other modifications and variations of the present invention are also within the scope of the present invention; besides the embodiments illustrated in this patent document, the present patent also discloses other tone quality improvement control methods, which are not described herein for reasons of brevity, but the tone quality improvement control methods based on the bone-qi composite path master-slave reverberation structure described in this patent also belong to the scope of protection of this patent.
Claims (10)
1. The utility model provides a structure of high tone quality bone conduction seat headrest, it constitutes this headrest main part by headrest covering (1) and headrest inner core (2) in this headrest covering (1), installs electric vibration device (3) to the position of human head in this headrest main part, and this electric vibration device (3) and audio control unit (4) signal connection, characterized by: the audio control unit (4) is also in signal connection with at least one air-conduction auxiliary loudspeaker (5), the audio control unit (4) transmits sound source audio signals to the electric vibration device (3) to generate bone-conduction hearing as a hearing main body, and meanwhile, the audio control unit (4) also transmits auxiliary audio signals to the air-conduction auxiliary loudspeaker (5) to be used for carrying out tone quality upgrading on the hearing of the bone-conduction main body generated by the electric vibration device (3).
2. The structure of a high-quality bone conduction seat headrest according to claim 1, wherein: the air-guide auxiliary horn (5) mounted on the headrest main body is composed of a vibrating body (7) embedded in the elastic sponge layer (6) and a vibrating surface layer (8) covered on the elastic sponge layer (6).
3. The structure of a high-quality bone conduction seat headrest according to claim 1, wherein: the air-guiding auxiliary horn (5) is a directional speaker, and the optimal mounting position is in the ceiling area of the carriage above the top of the head of the user, and the sound emission direction of the air-guiding auxiliary horn is directed to the ear of the user.
4. A control method of a high-tone bone conduction seat headrest is characterized by comprising the following steps:
step S1: the audio control unit (4) acquires an external audio signal, wherein the external audio signal at least comprises a sound source audio signal;
step S2: the audio control unit (4) transmits the sound source audio signal to the electric vibration device (3); at the same time
Step S3: the audio control unit (4) correspondingly processes the acquired external audio signals to generate corresponding auxiliary audio signals required by upgrading the hearing of the bone conduction main body from the air conduction path;
step S4: the audio control unit (4) transmits the auxiliary audio signal to an air-guide auxiliary loudspeaker (5) at a corresponding position;
step S5: the auxiliary audio signal sent by the air-conduction auxiliary loudspeaker (5) is synchronously transmitted to a user listening to the bone-conduction hearing generated by the electric vibration device (3) through an air-conduction path, so that the tone quality of the bone-conduction hearing is upgraded.
5. The method of controlling a high-quality bone conduction seat headrest according to claim 7, wherein: step S3 is to perform corresponding processing on the obtained external audio signal, specifically, the audio control unit (4) performs phase inversion processing on the phase of the ambient noise signal to generate an audio signal with the same waveform and the opposite phase as the ambient noise waveform as an auxiliary audio signal, and transmits the audio signal to the air-conduction auxiliary horn (5) to cancel the ambient noise, so that the signal-to-noise ratio of the bone conduction subject hearing generated by the electric vibration device (3) is improved, and the sound quality is clearer.
6. The method of controlling a high-quality bone conduction seat headrest according to claim 7, wherein: step S3 is to perform corresponding processing on the acquired external audio signal, specifically, the audio control unit (4) extracts the audio signal in the surround channel in the sound source audio signal as the sound image localization signal in the auxiliary audio signal, and transmits the sound image localization signal to the air-guide auxiliary speaker (5) at the corresponding position according to the position definition of the original channel of the sound image localization signal.
7. The method of controlling a high-quality bone conduction seat headrest according to claim 7, wherein: step S3 is to perform corresponding processing on the acquired external audio signal, specifically, the audio control unit (4) extracts the audio signal of the time difference portion as a sound image localization signal in the auxiliary audio signal according to the time difference between the audio signals of the left channel and the right channel in the sound source audio signal, and defines and transmits the audio signal to the air-guided auxiliary speaker (5) at the corresponding position according to the position of the channel where the sound image localization signal originally is located.
8. The method of controlling a high-quality bone conduction seat headrest according to claim 7, wherein: step S3 is to perform corresponding processing on the obtained external audio signal, specifically, the audio control unit (4) extracts an audio component contained in a frequency spectrum segment of the sound source audio signal that exceeds the frequency response characteristic range of the electric vibration device (3) and an audio component contained in a frequency spectrum segment of a frequency response curve valley segment of the electric vibration device (3) in the sound source audio signal, and both of the two audio components are used as auxiliary audio signals and are transmitted to the air-guide auxiliary speaker (5) at the corresponding position according to the position definition of the original channel of the auxiliary audio signal.
9. The method of controlling a high-quality bone conduction seat headrest according to claim 7, wherein: step S3 is to perform corresponding processing on the acquired external audio signal, specifically, the audio control unit (4) performs filtering, delay, attenuation, and nesting on the sound source audio signal to generate an auxiliary audio signal, and transmits the auxiliary audio signal to the air-guide auxiliary speaker (5) at the corresponding position.
10. The method of controlling a high-quality bone conduction seat headrest according to claim 7, wherein: step S3 is to perform corresponding processing on the acquired external audio signal, specifically, the loudness of the auxiliary audio signal output by the air-guide auxiliary speaker (5) and the loudness of the sound source audio signal output by the electric vibration device (3) by the audio control unit (4) are both adjusted in proportion to the change of the loudness of the ambient noise.
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| CN201910952723.4A CN111791775A (en) | 2019-09-27 | 2019-09-27 | Structure and control method of high-tone bone conduction seat headrest |
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| CN201910952723.4A CN111791775A (en) | 2019-09-27 | 2019-09-27 | Structure and control method of high-tone bone conduction seat headrest |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI785866B (en) * | 2020-11-02 | 2022-12-01 | 義大利商瑪圖爾有限公司 | Headrest provided with a system for two-way sound transmission by bone conduction |
| EP4311267A1 (en) * | 2022-07-18 | 2024-01-24 | B/E Aerospace, Inc. | Personal sound system combining bone conduction and directional speakers for passenger seats |
-
2019
- 2019-09-27 CN CN201910952723.4A patent/CN111791775A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI785866B (en) * | 2020-11-02 | 2022-12-01 | 義大利商瑪圖爾有限公司 | Headrest provided with a system for two-way sound transmission by bone conduction |
| US11849294B2 (en) | 2020-11-02 | 2023-12-19 | Martur Italy S.R.L. | Headrest provided with a system for two-way sound transmission by bone conduction |
| EP4311267A1 (en) * | 2022-07-18 | 2024-01-24 | B/E Aerospace, Inc. | Personal sound system combining bone conduction and directional speakers for passenger seats |
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