CN115052231B - Digitized vehicle-mounted personal follow-up ultrasonic directional sound field system - Google Patents
Digitized vehicle-mounted personal follow-up ultrasonic directional sound field system Download PDFInfo
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- CN115052231B CN115052231B CN202210965332.8A CN202210965332A CN115052231B CN 115052231 B CN115052231 B CN 115052231B CN 202210965332 A CN202210965332 A CN 202210965332A CN 115052231 B CN115052231 B CN 115052231B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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Abstract
The invention relates to the technical field of vehicle-mounted sound fields, in particular to a digital vehicle-mounted personal follow-up ultrasonic directional sound field system. The sound field system comprises a driver head position sensing device, an ultrasonic directional transmitting device and a hardware device used for carrying the ultrasonic directional transmitting device and the driver head position sensing device, and further comprises a data receiving module and a data processing module. According to the invention, the audio privacy of a driver in the driving process can be conveniently ensured through the ultrasonic personal follow-up sound field, and the driver can enjoy a personal acoustic environment under the condition of not limiting the driving posture of the driver, so that the ultrasonic output by the ultrasonic directional transmitting device is ensured to always point to the ear of the driver, and the problem of voice loss caused by head deviation of the driver in the driving process is solved.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted sound fields, in particular to a digital vehicle-mounted personal follow-up ultrasonic directional sound field system.
Background
The ultrasonic frequency is outside the hearing range of the human ear, so the ultrasonic wave does not transmit any auditory influence to the human ear. However, ultrasonic waves propagate in air with high directivity and nonlinear principles, so loading an audio signal amplitude-modulated on top of the ultrasonic signal can produce a highly directional audio beam that propagates in air capable of self-demodulation conveying the audio signal.
In order to protect the privacy of a vehicle driver who may encounter problems of making and receiving calls and listening to voice information while driving, the vehicle driver often uses an earphone, a low-volume hands-free device or a bone conduction device, but the above method still has inconvenience for the following reasons:
the mode of making and receiving calls and playing voice information by the earphone is adopted, and the earphone body is required to be inserted into ears no matter a common earphone or a wireless earphone, so that the influence on the hearing is caused, and a driver cannot hear external sound signals in time to cause accident potential;
the possibility of privacy disclosure still exists by adopting a low-volume hands-free calling and voice information playing mode, and the problem is particularly serious when passengers exist in a passenger seat;
the bone conduction equipment is adopted to make and receive calls and play voice information, the possibility of sound leakage still exists, and the privacy of the user cannot be effectively protected.
At present, the ultrasonic directional sound device can be used for solving the problems, however, the sound field emitted by the conventional ultrasonic directional sound device cannot follow the head of a user, and the head of the user can not listen to audio frequency after slightly deviating due to the extremely strong directivity of ultrasonic waves, so that the conventional method has higher requirements on the driving posture of a driver, meanwhile, the conventional ultrasonic directional sound device generally loads the sound to an analog sine wave signal, and the tone quality of the audio frequency heard by the user is not ideal due to the low sine wave output efficiency.
Disclosure of Invention
The invention aims to provide a digitalized vehicle-mounted personal follow-up ultrasonic directional sound field system to solve the problems in the background technology.
In order to achieve the above object, the present invention provides a digitized vehicle-mounted personal follow-up ultrasonic directional sound field system, comprising a driver head position sensing device, an ultrasonic directional transmitting device, and a hardware device for carrying the ultrasonic directional transmitting device and the driver head position sensing device, wherein the sound field system further comprises a data receiving module and a data processing module, wherein:
the output end of the data receiving module is connected with the input end of the data processing module, and the data receiving module is used for receiving an audio signal and sending the audio signal to the data processing module after receiving the audio signal;
the driver head position sensing module is used for acquiring the position of the driver head in the carriage to obtain position information;
the receiving end of the data processing module is connected with the data receiving module and the driver head position sensing module and used for receiving the audio signals and the position information and calculating parameters required by acoustic beam forming according to the position information of the driver head in the carriage, and the data processing module further performs digital signal processing and modulation on the obtained audio signals according to the forming parameters after the required parameters are calculated;
the output end of the data processing module is connected with the ultrasonic directional transmitting device, the ultrasonic directional transmitting device receives the audio signals which are output by the data processing module and are processed and modulated by digital signals, and the audio signals are output in a beam mode under the action of the beam forming circuit through the ultrasonic transduction array carried in the ultrasonic directional transmitting device, so that the audio signals can be output along with the head of a driver, and a sound zone is formed between the ears of the driver and the ultrasonic directional transmitting device;
meanwhile, the ultrasonic directional transmitting device (300) is matched with the sound areas (a, b) to remind dangerous driving actions.
As a further improvement of the technical scheme, the hardware device enables the head position sensing module and the ultrasonic directional transmitting device of the driver to be independently installed in the carriage through the shell on two sides of the instrument panel and the central rearview mirror.
As a further improvement of the technical scheme, the hardware device integrally installs the driver head position sensing module and the ultrasonic directional transmitting device.
As a further improvement of the technical scheme, the hardware device comprises a fine adjustment device which is movably connected with the ultrasonic directional transmitting device and the driver head angle sensing module.
As a further improvement of the technical solution, the beam forming circuit includes chips U1, U2, and U3, resistors R1, R2, R3, R4, and R5, and an ultrasonic transducer array group E1, where the chip U1 includes pins 1, 2, 3, 4, 5, 6, 7, and 8, the pin 1 of the chip U1 is connected to the resistors R1 and R2 connected in parallel, the resistors R1 and R2 are both 1000 Ω, and an interface J1 is provided at an input end of the resistors R1 and R2;
the chip U2 comprises pins 1, 2, 3, 4, 5, 6, 7 and 8, the pins 5 and 6 of the chip U1 are connected in parallel and then connected with the pin 5 of the chip U2, the pin 6 and the pin 7 of the chip U2 are connected in parallel, a resistor R5 and a resistor R4 are connected on the pin 6, and the resistor R4 is grounded through a connected capacitor C1;
the input of chip U3 is connected with pin 6 and pin 7 after the parallelly connected of chip U2, the input of chip U3 still is connected with the beam former, the output of driver head position response module is connected with positional information output module, the beam former receives the driver head angle of positional information output module output and the variable information such as distance, then the angle parameter output to chip U3 that the beam former will form, be connected through operational amplifier between the ultrasonic wave transduction array on the ultrasonic wave transduction array group E1 and the chip U3.
As a further improvement of the technical scheme, the ultrasonic directional transmitting device comprises a base and an ultrasonic transmitting end, wherein the ultrasonic transmitting end is arranged on the base, and the ultrasonic transmitting end is fixed on the hardware device through the base when the ultrasonic directional transmitting device is used.
Compared with the prior art, the invention has the beneficial effects that:
1. in this digital on-vehicle individual follow-up ultrasonic wave directive sound field system, can conveniently guarantee driver's in-process audio frequency privacy of driving through the individual follow-up sound field of ultrasonic wave to make the driver enjoy individual acoustic environment under the condition that does not restrict driver's driving gesture, thereby guarantee that the ultrasonic wave of ultrasonic wave directive emission device output points to driver's ear all the time, solve the problem that the pronunciation that the driver head skew leads to in-process of driving lost.
2. In this on-vehicle individual follow-up ultrasonic wave directive sound field system of digitization, when measuring the absolute value of the difference between distance and position of sitting distance and being higher than the predetermined range, chip U3 will carry the audio information transmission of position of sitting suggestion to data processing module, recycles ultrasonic wave directive emission device output to driver's ear after digital signal processing and PWM modulation to play the effect of reminding the driver to rectify the position of sitting, guarantee the security of whole driving in-process.
3. In the digital vehicle-mounted personal follow-up ultrasonic directional sound field system, when the head position sensing module of a driver detects that the head has large amplitude or swings back and forth, the audio information carrying a fatigue driving prompt is transmitted to the data processing module through the chip U3, and is output by the ultrasonic directional transmitting device after digital signal processing and PWM modulation, so that the driver can be reminded, and the danger brought by fatigue driving is reduced.
4. In the digital vehicle-mounted personal follow-up ultrasonic directional sound field system, the measurement distance and the sitting posture distance are called when the head position sensing module of the driver detects that the angle change of the head is large or swings back and forth, and the detection result of the head position sensing module of the driver is verified according to the range of the absolute value of the difference between the measurement distance and the sitting posture distance so as to improve the accuracy of fatigue driving reminding.
Drawings
FIG. 1 is a schematic view of the interior of a vehicle according to the present invention;
FIG. 2 is a schematic diagram of the module connection of the present invention;
FIG. 3 is a schematic diagram of a beamforming circuit of the present invention;
FIG. 4 is a second interior view of the vehicle according to the present invention;
FIG. 5 is a schematic diagram of the beam former calculation principle of the present invention;
FIG. 6 is a schematic diagram illustrating a fatigue driving prompt principle of the present invention;
fig. 7 is a schematic diagram illustrating the sitting posture reminding principle of the present invention.
The various reference numbers in the figures mean:
100. a carriage; 200. a detection device; 300. an ultrasonic directional transmitting device; 310. a base body; 320. an ultrasonic wave transmitting end.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a digital vehicle-mounted personal follow-up ultrasonic directional sound field system with a driver head position sensing device, which can conveniently ensure the audio privacy of a driver in the driving process through an ultrasonic personal follow-up sound field and enable the driver to enjoy the personal acoustic environment under the condition of not limiting the driving posture of the driver.
As shown in fig. 1 and fig. 2, the sound field system includes an ultrasonic directional transmitting device 300, a data receiving module, a data processing module, and a hardware device for carrying the ultrasonic directional transmitting device 300 and the driver head position sensing device, wherein: the output end of the data receiving module is connected with the input end of the data processing module, and after the data receiving module receives the audio signal, the audio signal is sent to the data processing module; the driver head position sensing module is used for acquiring the position of the head of a driver in the carriage 100 to obtain position information; the receiving end of the data processing module is connected with the data receiving module and the driver head position sensing module and used for receiving the audio signals and the position information and calculating parameters required by acoustic beam forming according to the position information of the driver head in the carriage, and the data processing module further performs digital signal processing and PWM modulation on the obtained audio signals according to the forming parameters after the required parameters are calculated; the output end of the data processing module is connected with the ultrasonic directional transmitting device 300, the ultrasonic directional transmitting device 300 receives the audio signal which is output by the data processing module and is processed by digital signals and subjected to PWM modulation, and outputs the audio signal in a beam mode under the action of a beam forming circuit through an ultrasonic transduction array carried in the ultrasonic directional transmitting device 300, namely, ultrasonic waves are output, so that the audio signal can be output along with the head of a driver, sound zones a and b are formed between the ears of the driver and the ultrasonic directional transmitting device 300, the sound zones a and b respectively correspond to the two ears of the driver, so that the driver can hear, and a sound-free zone is formed at the parts except the sound zones a and b, so that the driver can make a call when driving, the privacy of listening to voice information is fully guaranteed, and the interference to people in the vehicle except for the driver is avoided.
Meanwhile, the ultrasonic directional transmitting device 300 is matched with the sound areas a and b to remind dangerous driving actions (such as fatigue driving, sitting posture irregularity and the like), and the matching of the ultrasonic directional transmitting device 300 and the sound areas a and b can be that the sound areas a and b work independently or work cooperatively.
The specific implementation of this embodiment is as follows:
the first embodiment, as shown in fig. 1, the hardware device in this embodiment is composed of a housing on both sides of an instrument panel in a vehicle compartment 100 and a central rear-view mirror, wherein the ultrasonic directional transmitting device 300 is installed through the housing on both sides, and the central rear-view mirror is used for installing a driver head position sensing module, which will be described herein: the driver head position sensing module is a detection device 200 for emitting laser radar or acoustic radar, and can also be a detection device 200 composed of an artificial intelligent depth camera.
It should be noted that the hardware device is not limited to the central rear view mirror and the housing on both sides of the dashboard, because the purpose of the hardware device is to fix the driver's head position sensing module at any position in the vehicle cabin 100 where the driver can be seen directly, and the ultrasonic directional transmitting device 300 is installed at any position in the vehicle cabin 100 where there is no obstacle between the driver and the driver.
When the data receiving module works, firstly, the data receiving module receives an audio signal, and the audio signal can be from a vehicle machine system or a device end such as a mobile phone, so that the data receiving form of the data receiving module can be a wired connection mode or a wireless connection mode; after the audio signal is received, the head position sensing module of the driver obtains the position of the head of the driver in the carriage 100 to obtain position information;
as shown in fig. 2, the input end of the data processing module is connected to the data receiving module to obtain the audio signal and the position information of the head of the driver in the vehicle cabin, then the parameters required for acoustic beam forming are calculated according to the position information of the head of the driver in the vehicle cabin, further the digital signal processing and PWM modulation are performed on the obtained audio signal according to the acoustic beam forming parameters, and finally the ultrasonic directional transmitting device 300 obtains the audio signal which is subjected to the digital signal processing and PWM modulation, and outputs the audio signal in a beam forming manner through the ultrasonic transducer array;
in this process, the beam forming circuit principle is as follows:
as shown in fig. 3, the beam forming circuit includes chips U1, U2, and U3, resistors R1, R2, R3, R4, and R5, and an ultrasonic transducer array group E1, where the chip U1 includes pins 1, 2, 3, 4, 5, 6, 7, and 8, the pin 1 of the chip U1 is connected to the resistors R1 and R2 arranged in parallel, the resistors R1 and R2 are both 1000 Ω, and an interface J1 is provided at an input end of the resistors R1 and R2;
the chip U2 comprises pins 1, 2, 3, 4, 5, 6, 7 and 8, the pins 5 and 6 of the chip U1 are connected in parallel and then connected with the pin 5 of the chip U2, the pin 6 of the chip U2 is connected with the pin 7 in parallel, the pin 6 is connected with resistors R5 and R4, and the resistor R4 is grounded through a connected capacitor C1;
the input end of the chip U3 is connected with the pin 6 and the pin 7 after the chip U2 is connected in parallel, the input end of the chip U3 is further connected with a beam former, the output end of the driver head position sensing module is connected with a position information output module, the beam former receives the change information of the driver head angle, the distance and the like output by the position information output module, then the beam former outputs the formed angle parameters to the chip U3, the ultrasonic transduction array on the ultrasonic transduction array group E1 is connected with the chip U3 through an operational amplifier (in fig. 3, only the operational amplifier Q1 and the operational amplifier Qn show specific original elements, and the rest of the operational amplifiers show through models, but the connection relationship is that the ultrasonic transduction array is connected with the chip U3 through the operational amplifier), which needs to be explained: the number of the ultrasonic transduction arrays arranged on the ultrasonic transduction array group E1 is not limited, and if N ultrasonic transduction arrays are arranged on the ultrasonic transduction array group E1, there are N corresponding operational amplifiers, i.e., Q1, Q2, … and Qn, and the model of the operational amplifier is L298N.
The specific principle is described as follows: firstly, an interface J1 and an audio signal output end are connected in a wired or wireless connection mode (for example, a mobile phone, a car machine, a music player and the like), the interface J1 in the embodiment adopts a wired connection mode (for example, a USB data line, an audio line and the like), if wireless connection is required, the interface J1 is changed into wireless receiving equipment such as a Bluetooth receiver and the like, a port 3 of the interface J1 is a left sound channel, a port 2 is a right sound channel, and the two sound channels are combined through resistors R1 and R1 of 1000 omega; then the audio signal is transmitted to a chip U1, the chip U1 is responsible for processing the audio signal with the average value of 0 to the average value of 1.5v, the method is that the original audio signal is superposed with a direct current 1.5v voltage by using a signal superposer (loaded on the chip U1) with the type INA132, and then the superposed signal passes through a signal amplifier (loaded on the chip U2) formed by LM358 to reduce the signal-to-noise ratio of a subsequent circuit.
It should be noted that the chip U2 is connected to a 4.7uf capacitor C1, so that only ac signals are amplified and dc 1.5v is reserved, then the amplified audio signals enter the chip U3, and at the same time, the parameters calculated in the beamformer are also transmitted to the chip U3, then the chip U3 outputs PWM modulated amplified signals in different output channels according to a preprogrammed program through a field programmable gate FPGA, and each output channel of the field programmable gate FPGA is connected to a driver of the type L298N, each driver is responsible for driving a column of ultrasonic transduction arrays in the ultrasonic transduction array set, so that the ultrasonic transduction arrays emit ultrasonic waves with angle changes, so as to form adjusted voiced regions a1, b1 between the ultrasonic transduction arrays and the ears of the driver, as shown in fig. 4, where the adjusted voiced regions a1, b1 are the coverage of the ultrasonic transduction arrays emitting ultrasonic waves with adaptive angle changes after the head position changes.
With reference to fig. 5, the present invention discloses a calculation formula of the beamformer:
in the formula, delta T is the time difference of the transducers between two adjacent ultrasonic transduction arrays; r is the radius of the transducer in the ultrasonic transduction array; c is the speed of sound in air;
is the angle between the ultrasonic wave output direction and the normal, where
Measured by the driver head angle sensing module (since the hardware device can make the normal line face the ear of the driver when the ultrasonic directional transmitting device 300 is installed, the angle of the head deviation measured by the driver head angle sensing module in the later stage is the angle of the head deviation
It) is received.
When in work: if the transducer in the leftmost column emits ultrasonic waves first, the ultrasonic waves are emitted again to the right of the leftmost column after the time of delta T, and so on, the ultrasonic waves can be output to the human ears to form the adjusted sound zones a1 and b1.
Preferably, the purpose of the driver head position sensing module is to provide the relative position of the driver head, particularly the ears, and the ultrasonic transducer array in the form of coordinates, and position information formed by the coordinates is transmitted to the data processing module.
In addition, the data processing module can be integrated into a driving computer, or can be an independent microprocessor or is arranged on a field programmable gate circuit FPGA, and the data processing module is used for integrating the coordinate information to obtain acoustic beam forming parameters of each row of ultrasonic transducers in the ultrasonic transducer array and carrying out digital signal processing on the obtained audio signals according to the acoustic beam forming parameters related to the row number of the ultrasonic transducers; then the data processing module modulates the audio signal processed by the signal on a 40KHz square wave in a PWM mode; the total number of square waves modulated at this time is equal to the total number of columns of the aforementioned ultrasonic transducers.
As shown in fig. 2, the ultrasonic directional transmitting device 300 includes a base 310 and an ultrasonic transmitting end 320, that is, an ultrasonic transducer array set, the ultrasonic transmitting end 320 is disposed on the base 310, the number of the ultrasonic transducer arrays in the ultrasonic transducer array set in fig. 2 is only used for demonstration, and the present invention is not limited thereto, and the ultrasonic transmitting end 320 is fixed on a hardware device through the base 310 during use.
The ultrasonic directional transmitting devices 300 may be one or two, and preferably two, for the purpose of generating a stereo effect.
In the second embodiment, the hardware device includes a fine-tuning device (which may be a hinged structure) movably connected to the ultrasonic directional transmitting device 300 (here, the driver head angle sensing module may also be used), and the purpose of the fine-tuning device is to fine-tune the output direction of the ultrasonic directional transmitting device 300 or the driver head angle sensing module, so as to roughly align with the ears of the user to offset the problem of different head positions caused by different user physiques, and also avoid the influence of a certain obstacle, where it is to be noted that the ultrasonic directional transmitting device 300 and the driver head angle sensing module may be integrally installed through the hardware device, or may be installed independently.
In the third embodiment, the output end of the driver head position sensing module is connected with the chip U3, namely, the field programmable gate circuit FPGA carried on the chip U3 is connected, when the driver head position sensing module detects that the angle change of the head is large or swinging back and forth, the audio information carrying the fatigue driving prompt is transmitted to the data processing module through the chip U3, and is output by the ultrasonic directional transmitting device 300 after being processed by digital signals and modulated by PWM, so that the driver can be reminded, and the danger caused by fatigue driving is reduced.
In the fourth embodiment, as shown in fig. 2, an ultrasonic receiver is further mounted on the ultrasonic directional transmitting device 300, and the ultrasonic receiver receives ultrasonic waves (specifically, ultrasonic waves returned from the ear) transmitted by the ultrasonic directional transmitting device 300 to the ear, the sound field system in fig. 7 includes a timer and a sitting posture reminding module, and the sitting posture reminding module includes a distance measuring unit and a sitting posture predicting unit, wherein: the timer is connected with the input end of the distance measuring unit, and records the initial node of the ultrasonic wave emitted by the ultrasonic directional emitting device 300 and the ending node of the ultrasonic wave received by the corresponding ultrasonic receiver through the timer.
When the ultrasonic directional transmitting device works, firstly, the time of the timer takes the moment of the ultrasonic directional transmitting device 300 sending the ultrasonic waves as an initial node, then the moment of the ultrasonic receiver receiving the ultrasonic waves as an end node, the time from the initial node to the end node is taken as measurement time t, and the measurement time t is input into the distance measuring unit;
it can be known that the propagation speed of the ultrasonic wave in the air is 340m/s, so the distance L =340t/2 (unit meter) is measured, and the height of the driver is input into the sitting posture prediction unit in advance, and then the sitting posture prediction unit combines with the sitting posture model to predict the distance from the lower ear of the height to the ultrasonic directional transmitting device 300, and the distance is the sitting posture distance d;
for example, the height of the driver is determined, and the head position of the driver should not change widely after the driver sits in the driving position, that is, the sitting posture prediction unit analyzes a standard sitting posture model according to the height and then combines the driving state, the position of the ear is fixed at the moment and is allowed to move within a preset range, the preset range is preferably controlled within a range of not more than 3-6cm, and the ear exceeding the range indicates that the sitting posture is not standard (the absolute value of the difference between the measuring distance L and the sitting posture distance d is more than 3-6 cm);
in addition, the output end of the sitting posture prediction unit is connected with the chip U3, when the absolute value of the difference between the measured distance L and the sitting posture distance d is higher than 3-6cm, the chip U3 transmits audio information carrying sitting posture prompt to the data processing module, and the audio information is output to the ear of the driver by the ultrasonic directional transmitting device 300 after digital signal processing and PWM modulation, so that the function of reminding the driver to correct the sitting posture is achieved, and the safety in the whole driving process is guaranteed;
moreover, the output end of the sitting posture prediction unit is connected with the head position sensing module of the driver, the head position sensing module of the driver detects the angle change of the head in a large range or swinging back and forth, the measuring distance L and the sitting posture distance d are called, and the detection result of the head position sensing module of the driver is verified according to the range of the absolute value of the difference between the measuring distance L and the sitting posture distance d, so that the accuracy of fatigue driving reminding is improved.
It should be noted that although the distance to the ear can be measured by the driver head position sensing module, the present embodiment preferably uses ultrasonic waves for distance measurement, because the driver head position sensing module sometimes needs to adjust the orientation, and once the initial position for measuring the ear distance is adjusted, the initial position is changed, which affects the result of constructing the sitting posture distance d, that is, once the driver head position sensing module is adjusted, the sitting posture distance d needs to be reconstructed once (if the sitting posture distance d is not reconstructed, the accuracy of the final result is greatly reduced), and the ultrasonic directional transmitting device 300 only changes the direction of the ultrasonic waves, but does not affect the initial position, so the distance measurement using the ultrasonic waves transmitted by the ultrasonic directional transmitting device 300 is more accurate.
In addition, the digitalized vehicle-mounted personal follow-up ultrasonic directional sound field system also comprises a power supply device, and the power supply device is connected with a vehicle power supply outlet.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. Digital on-vehicle individual follow-up ultrasonic directional sound field system, its characterized in that: including driver head position induction system, ultrasonic wave directive emission device (300) and be used for carrying on ultrasonic wave directive emission device (300) and driver head position induction system's hardware device, the sound field system still includes data receiving module and data processing module, wherein:
the output end of the data receiving module is connected with the input end of the data processing module, and the data receiving module is used for receiving an audio signal and sending the audio signal to the data processing module after receiving the audio signal;
the driver head position sensing module is used for acquiring the position of the driver head in the carriage (100) to obtain position information;
the receiving end of the data processing module is connected with the data receiving module and the driver head position sensing module and used for receiving audio signals and position information and calculating parameters required by acoustic beam forming according to the position information of the driver head in the carriage, and the data processing module further performs digital signal processing and PWM modulation on the obtained audio signals according to the forming parameters after the required parameters are calculated;
the output end of the data processing module is connected with an ultrasonic directional transmitting device (300), the ultrasonic directional transmitting device (300) receives the audio signal which is output by the data processing module and is processed by digital signals and modulated by PWM, and outputs the audio signal in a beam mode under the action of a beam forming circuit through an ultrasonic transduction array carried in the ultrasonic directional transmitting device (300), so that the audio signal can be output along with the head of a driver, and sound zones (a, b) are formed between the ears of the driver and the ultrasonic directional transmitting device (300);
meanwhile, the ultrasonic directional transmitting device (300) is matched with the sound areas (a, b) to remind dangerous driving actions;
the wave beam forming circuit comprises chips U1, U2 and U3, resistors R1, R2, R3, R4 and R5 and an ultrasonic wave transduction array group E1, wherein the chip U1 comprises pins 1, 2, 3, 4, 5, 6, 7 and 8, the pin 1 of the chip U1 is connected with the resistors R1 and R2 which are arranged in parallel, the resistors R1 and R2 are both 1000 omega, and the input ends of the resistors R1 and R2 are provided with an interface J1;
the chip U2 comprises pins 1, 2, 3, 4, 5, 6, 7 and 8, the pins 5 and 6 of the chip U1 are connected in parallel and then connected with the pin 5 of the chip U2, the pin 6 and the pin 7 of the chip U2 are connected in parallel, a resistor R5 and a resistor R4 are connected on the pin 6, and the resistor R4 is grounded through a connected capacitor C1;
the input of chip U3 is connected with pin 6 and pin 7 after the parallelly connected of chip U2, the input of chip U3 still is connected with the beam-former, driver head position response module's output is connected with position information output module, the change information of driver head angle and distance that the beam-former received position information output module output, then the angle parameter output to chip U3 that the beam-former will form, be connected through operational amplifier between the ultrasonic wave transduction array on the ultrasonic wave transduction array group E1 and the chip U3.
2. The digitized vehicular personal follow-up ultrasonic directional sound field system of claim 1, wherein: the hardware device enables the head position sensing module and the ultrasonic directional transmitting device (300) of the driver to be independently installed in the carriage (100) through the shell on the two sides of the instrument panel and the central rearview mirror.
3. The digitized vehicular personal follow-up ultrasonic directional sound field system of claim 1, wherein: the hardware device integrally installs the driver head position sensing module and the ultrasonic directional transmitting device (300).
4. The digitized in-vehicle personal follow-up ultrasonic directional sound field system of claim 2 or 3, wherein: the hardware device comprises fine adjustment equipment movably connected with the ultrasonic directional transmitting device (300) and the driver head angle sensing module.
5. The digitized vehicular personal follow-up ultrasonic directional sound field system of claim 4, wherein: the ultrasonic directional transmitting device (300) comprises a base body (310) and an ultrasonic transmitting end (320), wherein the ultrasonic transmitting end (320) is arranged on the base body (310), and the ultrasonic transmitting end (320) is fixed on a hardware device through the base body (310) when the ultrasonic directional transmitting device is used.
6. The digitized vehicular personal follow-up ultrasonic directional sound field system according to claim 1, wherein: the output end of the driver head position sensing module is connected with the chip U3, when the driver head position sensing module detects that the head has large amplitude or swing back and forth angle change, the audio information carrying fatigue driving prompt is transmitted to the data processing module through the chip U3, and the audio information is output by the ultrasonic directional transmitting device (300) after being processed by digital signals and modulated by PWM.
7. The digitized vehicular personal follow-up ultrasonic directional sound field system according to claim 6, wherein: the sitting posture reminding device comprises a sitting posture reminding module, wherein the sitting posture reminding module comprises a distance measuring unit and a sitting posture predicting unit, and a timer is connected with the input end of the distance measuring unit;
the ultrasonic directional transmitting device (300) is provided with an ultrasonic receiver, the timer is used for recording an initial node of the ultrasonic directional transmitting device (300) for transmitting ultrasonic waves and an end node of the ultrasonic receiver for receiving the ultrasonic waves so as to obtain measuring time input to the distance measuring unit, and the distance measuring unit obtains a measuring distance according to the measuring time;
the output end of the distance measuring unit is connected with the sitting posture prediction unit and used for inputting the measured distance to the sitting posture prediction unit and predicting the sitting posture of the driver through the sitting posture prediction unit to obtain a sitting posture distance;
the output end of the sitting posture prediction unit is connected with the chip U3, after the distance is measured to exceed the preset range of the sitting posture distance, the chip U3 transmits the audio information carrying the sitting posture prompt to the data processing module, and the audio information is output by the ultrasonic directional transmitting device (300) after being processed by digital signals and modulated by PWM.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010204847A (en) * | 2009-03-02 | 2010-09-16 | Toyota Motor Corp | Driver condition detection device and collision early detection device using same |
| CN102582473A (en) * | 2012-03-06 | 2012-07-18 | 浙江吉利汽车研究院有限公司 | Automatic driving sitting position adjusting device and method |
| CN109564279A (en) * | 2016-08-04 | 2019-04-02 | 皇家飞利浦有限公司 | Ultrasonic system front-end circuit with impulse generator and linear amplifier for array energy transducer |
| CN110383374A (en) * | 2017-01-05 | 2019-10-25 | 诺威托系统有限公司 | Audio communication system and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8137280B2 (en) * | 2005-02-09 | 2012-03-20 | Surf Technology As | Digital ultrasound beam former with flexible channel and frequency range reconfiguration |
| CN108377435A (en) * | 2018-03-23 | 2018-08-07 | 钰太芯微电子科技（上海）有限公司 | A kind of twin wire microphone with ultrasonic wave identification |
-
2022
- 2022-08-12 CN CN202210965332.8A patent/CN115052231B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010204847A (en) * | 2009-03-02 | 2010-09-16 | Toyota Motor Corp | Driver condition detection device and collision early detection device using same |
| CN102582473A (en) * | 2012-03-06 | 2012-07-18 | 浙江吉利汽车研究院有限公司 | Automatic driving sitting position adjusting device and method |
| CN109564279A (en) * | 2016-08-04 | 2019-04-02 | 皇家飞利浦有限公司 | Ultrasonic system front-end circuit with impulse generator and linear amplifier for array energy transducer |
| CN110383374A (en) * | 2017-01-05 | 2019-10-25 | 诺威托系统有限公司 | Audio communication system and method |
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