WO2023035472A1 - 音频系统及其控制方法、装置 - Google Patents

音频系统及其控制方法、装置 Download PDF

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Publication number
WO2023035472A1
WO2023035472A1 PCT/CN2021/138408 CN2021138408W WO2023035472A1 WO 2023035472 A1 WO2023035472 A1 WO 2023035472A1 CN 2021138408 W CN2021138408 W CN 2021138408W WO 2023035472 A1 WO2023035472 A1 WO 2023035472A1
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Prior art keywords
audio
audio system
directional
preset
directional speaker
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PCT/CN2021/138408
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English (en)
French (fr)
Inventor
郝选
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歌尔股份有限公司
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Publication of WO2023035472A1 publication Critical patent/WO2023035472A1/zh

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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
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers

Definitions

  • the invention relates to the technical field of intelligent audio control, in particular to an audio system control method and device thereof.
  • the main purpose of this application is to propose a control method and device for an audio system, aiming at realizing the function of playing audio signals in independent zones.
  • an audio system which includes:
  • the directional loudspeaker group includes a plurality of directional loudspeakers, and a plurality of the directional loudspeakers are respectively arranged at corresponding first preset positions; wherein,
  • the plurality of directional speakers When the plurality of directional speakers are working, they radiate sound waves to the second preset positions respectively, so as to form a three-dimensional regional sound field in the preset sound transmission area, and the first preset position and the second preset position are located in the Within the preset sound transmission area.
  • each of the directional loudspeaker groups is set in a preset sound transmission area.
  • the audio system also includes:
  • a plurality of audio input interfaces the number of the audio input interfaces corresponds to the number of the directional speaker groups, and each audio input interface is connected to one audio signal;
  • a plurality of audio processors the input end of each said audio processor is connected with one said audio input interface, and the plurality of output ends of each said audio processor are connected with a plurality of said directional loudspeaker groups.
  • the directional speakers are connected in one-to-one correspondence; where,
  • Each of the audio processors is configured to convert the received audio signal into audio signals of multiple channels, and then output the audio signals of each channel to the corresponding directional speaker.
  • the audio system also includes:
  • a plurality of control switches one control switch is arranged in series between the input terminals of every two audio processors; wherein,
  • the two audio processors connected to the control switch process the incoming audio signal and output it to the respective directional speakers, so as to realize the audio signal in multiple said Play synchronously in the preset sound transmission area.
  • the audio processor is further configured to process the audio signal into multiple channels according to the stored vector positions between the second preset position and multiple first preset positions. audio signal, and output the audio signal of each channel to the corresponding directional speaker.
  • the directional speaker is an ultrasonic transducer.
  • each of the audio processors includes:
  • An audio modulation circuit is connected to one of the audio input interfaces, and the audio modulation circuit is used to modulate the received audio signal and output it to the corresponding ultrasonic transducer.
  • the present application also proposes a control method of an audio system, the audio system includes a plurality of directional loudspeaker groups, each of the directional speaker groups is arranged in a preset sound transmission area; the control method of the audio system includes :
  • the corresponding directional speaker group among the plurality of directional speaker groups is controlled to play the audio signal in the corresponding preset sound transmission area.
  • control method of the audio system also includes the following steps:
  • the present application also proposes a control device for an audio system, including the audio system as described above; and,
  • a memory and a processor wherein the memory stores a control program of the audio system, and when the control program of the audio system is executed by the processor, the steps of the above audio system control method are implemented.
  • the present application also proposes a vehicle, including a cavity and the above-mentioned audio system; wherein,
  • the audio system is arranged on and/or in the cavity.
  • the vehicle also includes:
  • the audio system has a plurality of directional loudspeaker groups, and each of the directional loudspeaker groups corresponds to one seat.
  • the vehicle further includes a control assembly electrically connected to the audio system.
  • the audio system of the present application sets up directional speaker groups, and each group includes directional speakers, separates multiple directional speakers at corresponding first preset positions, realizes that when multiple directional speakers are working, they respectively direct the second preset positions.
  • This application can radiate sound waves to a designated position according to actual application requirements, so that the user pos1 in the preset sound transmission area can receive the audio signal played by the directional speaker group, while other places outside the three-dimensional area sound field Then the audio signal played by the directional loudspeaker group cannot be received, so as to realize the function of playing the audio signal in independent partitions.
  • the present application is conducive to improving the privacy of the user's audio playback, and at the same time can meet the needs of users in different positions in the same space for audio signals.
  • Fig. 1 is a schematic diagram of a three-dimensional regional sound field formed when the audio system of the present application is working;
  • FIG. 2 is a schematic diagram of a circuit structure of an embodiment of the audio system of the present application.
  • FIG. 3 is a schematic diagram of the circuit structure of an embodiment of the audio processor in FIG. 2;
  • FIG. 4 is a schematic structural diagram of an embodiment of the audio system of the present application applied to vehicles
  • Fig. 5 is the frequency response curve of the driver's seat position and the co-pilot position of the vehicle of the present application
  • FIG. 6 is a schematic flow diagram of an embodiment of a method for controlling an audio system of the present application.
  • Fig. 7 is a schematic flow chart showing another embodiment of the audio system control method of the present application.
  • first and second are used to distinguish different objects, not to describe a specific order.
  • the terms “include” and “have”, as well as any variations thereof, are intended to cover a non-exclusive inclusion.
  • a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.
  • the present application proposes an audio system.
  • the audio system includes:
  • the directional loudspeaker group 10 includes a plurality of directional loudspeakers (10a, 10b, 10c), and a plurality of the directional loudspeakers (10a, 10b, 10c) are respectively arranged in corresponding first preset positions; wherein,
  • the plurality of directional speakers (10a, 10b, 10c) (10a, 10b, 10c) When the plurality of directional speakers (10a, 10b, 10c) (10a, 10b, 10c) are in operation, they respectively direct the second preset position to radiate sound waves, so as to form a three-dimensional regional sound field in the preset sound transmission area, and the The first preset position and the second preset position are located in the preset sound transmission area.
  • the first preset position is the installation position of each directional speaker
  • the second preset position is the target position where the directional speaker radiates the audio signal, such as a preferred position where the user pos1 can perceive the audio signal.
  • This position can be when the user pos1 is in the preset sound transmission area, for example, sitting in the preset sound transmission area, or lying in the preset sound transmission area, etc.
  • the second preset position may specifically be the position of the head of the user pos1 within the preset sound transmission area, and specifically may be the midpoint between the listener's two ears.
  • the sound outlet of the directional speaker can be directed toward the position of the head.
  • the second preset position may be a fixed position or an adjustable position.
  • each directional speaker is fixed at the first preset position.
  • the second preset position is an adjustable position, for example, when changing from sitting to lying down, the head position may be offset. At this time, you can adjust the installation position of the directional speaker or adjust the directional speaker The angle of the sound outlet achieves the purpose of adjusting the second preset position, so that the sound radiation direction of the directional speaker always follows the user pos1.
  • it can be adjusted manually, or by setting a camera, a sensor, such as an infrared sensor, to detect the position of the user's pos1 head, and then drive the directional speaker to move through a motor to adjust the second preset position.
  • a sensor such as an infrared sensor
  • the number of directional speakers in a set of directional speaker groups 10 can be two, three, or four, which can be set according to the area where the audio system is applied and the volume of the product, and is not limited here.
  • multiple directional speakers (10a, 10b, 10c) can be arranged at equal intervals or at non-equidistant intervals, and it is only necessary to ensure the vector position formed by the propagation direction of the sound source of the multiple directional speakers (10a, 10b, 10c) Able to point to a second preset location.
  • the two directional speakers can be set on both sides of the second preset position, and each directional speaker is set at a distance between the first preset position and the second preset position The distance can be equidistant.
  • the distance between one of the directional speakers and the second preset position is equal to the distance between the other directional speaker and the second preset position, and the distance between the two directional speakers.
  • the three directional speakers can be respectively arranged on both sides of the left and right hands used to be in the preset sound transmission area, and above the head.
  • the directional loudspeaker can be realized by using a loudspeaker capable of directional transmission of audio signals, such as a linear array loudspeaker, an ultrasonic loudspeaker, and the like.
  • a loudspeaker capable of directional transmission of audio signals
  • an ultrasonic speaker especially an ultrasonic transducer is taken as an example for illustration.
  • the following non-singular wave equation is obtained:
  • ⁇ 0 is the fluid density
  • p 1 is the sound pressure of the fundamental wave
  • p s is the sound pressure of the secondary wave
  • c 0 is the sound velocity
  • ⁇ is the nonlinear parameter of the medium.
  • p 0 is the ultrasonic sound pressure
  • ⁇ 0 is the ultrasonic frequency
  • m is the modulation depth, indicating the degree to which the carrier amplitude is controlled by the modulating signal
  • ⁇ is the carrier frequency.
  • the ultrasonic wave emitted by the ultrasonic transducer propagates in the air, and the acoustic signal source of single-frequency audible sound g(t) can be generated in its main sound beam.
  • the sound source equation is:
  • the second part on the right side of formula (4) is the second harmonic component, that is, the distortion component.
  • the ultrasonic wave emitted by the ultrasonic transducer propagates in the air and the demodulated audible sound wave still propagates along the axial direction, which has a strong directivity.
  • the VBAP uses two or three units of the position of multiple directional speakers (10a, 10b, 10c)
  • the unit vector of the virtual sound source is synthesized by the vector to achieve the purpose of constructing the propagation direction of the sound source. For example, when the number of speakers in each speaker group is 3, the 3 speakers can form three channels.
  • the three channels formed by the speakers are respectively marked as channel 1, channel 2 and channel 3.
  • the unit vectors of the three loudspeakers are regarded as base vectors, and the direction of the virtual sound source is obtained by their linear combination. Assuming that the unit vectors of the three loudspeakers from the second preset position are l 1 , l 2 , l 3 respectively, the gain of the audio signal of each loudspeaker is g 1 , g 2 , g 3 , and the unit vector of the sound source is l 0 , Then l 0 can be expressed as:
  • the audio system of the present application sets directional loudspeaker groups 10, and each group includes directional loudspeakers, and a plurality of directional loudspeakers (10a, 10b, 10c) are set up in corresponding first preset positions, realizing a plurality of directional loudspeakers ( 10a, 10b, 10c) during operation, radiate sound waves to the second preset positions respectively, so as to form a three-dimensional regional sound field in the preset sound transmission area.
  • the present application can radiate sound waves to a designated position according to actual application requirements, so that the user pos1 in the preset sound transmission area can receive the audio signal played by the directional speaker group 10, while the user outside the sound field in other three-dimensional areas The local area cannot receive the audio signal played by the directional loudspeaker group 10, so as to realize the function of playing the audio signal in independent zones.
  • the present application is conducive to improving the privacy of the user pos1's audio playback, and at the same time can meet the audio signal requirements of different users pos1 in the same space.
  • each of the directional speaker groups 10 is separately arranged in a predetermined sound transmission area.
  • the audio system can be applied to vehicles such as automobiles, trains, and airplanes, and can also be applied to public areas such as movie theaters and conference rooms.
  • vehicles such as automobiles, trains, and airplanes
  • public areas such as movie theaters and meeting rooms.
  • the audio system also stays at the traditional direct playback, which cannot realize audio three-dimensional area playback. For example, the driver needs to listen to navigation information, the co-pilot needs music, and the rear passengers need to rest quietly, which cannot be satisfied at the same time. Playing back music cannot achieve three-dimensional reproduction of music.
  • each group of directional speaker groups 10 can construct a three-dimensional area sound field, so that the three-dimensional area audio is partitioned and independent.
  • the preset sound transmission area is also set in the corresponding place according to the applicable scene of the audio system. Specifically, it can be the seat position in the vehicle compartment, the seat in the movie theater, the easy chair, the movable backrest armchair, or the seat in the family entertainment room. Sofa seat position and so on, the activity position of each user pos1 in the area.
  • one directional loudspeaker group 10 may be provided corresponding to each seat.
  • a plurality of the directional speaker groups 10 are arranged in an array.
  • Each preset sound transmission area is spaced apart from each other, or the audio signal radiated by each directional speaker group 10 can be perceived by the user pos1 only in the preset sound transmission area corresponding to the directional speaker group 10, and will not be User pos1 in other areas perceives it.
  • the audio system also includes:
  • a plurality of audio input interfaces AU-in the number of the audio input interfaces AU-in corresponds to the number of the directional speaker groups 10, and each audio input interface AU-in is connected to one audio signal;
  • a plurality of said directional loudspeakers (10a, 10b, 10c) of the loudspeaker group 10 are connected in one-to-one correspondence; wherein,
  • Each of the audio processors 20 is configured to convert the received audio signal into audio signals of multiple channels, and then output the audio signals of each channel to the corresponding directional speakers.
  • the audio input interface AU-in can be a digital audio access port, and can also be an analog audio access port, and multiple audio input interfaces AU-in are respectively connected to one audio signal, and the audio processor 20 can process the audio signal Perform decoding, modulation, amplification, filtering, mixing, etc., and each audio processor 20 will generate audio signals of multiple channels according to the number of speakers in each group of directional speaker groups 10, and output them to each directional speaker group. Each directional speaker will convert the received audio signal into mechanical vibration of its corresponding channel.
  • the audio signals connected to each audio input interface AU-in can be the same or different.
  • the three-dimensional area sound field corresponding to the cab can play the navigation information needed by the driver, the three-dimensional area sound field corresponding to the co-pilot can play music, and the three-dimensional area sound fields corresponding to the left rear seat and right rear seat can not play audio.
  • the audio input interface AU-in corresponding to the three-dimensional sound field of the left rear seat and the right rear seat does not receive an audio signal.
  • the audio system also includes:
  • a plurality of control switches (S1, S2, S3), one control switch (S1, S2, S3) is arranged in series between the input terminals of every two audio processors 20; wherein,
  • the two audio processors 20 connected to the control switches process the incoming audio signals and output them to the corresponding directional speakers, so as to Realize audio synchronous playback of multiple preset sound transmission areas.
  • control switches are bidirectional conduction switches, that is, the audio signal connected to one audio input interface AU-in can be output to the input end of another audio processor 20 through the control switch, Or another audio input interface AU-in The audio signal connected to an audio input interface AU-in can be input to the audio processor 20 .
  • a control switch is arranged in series between each audio input interface AU-in.
  • a plurality of control switches (S1, S2, S3) can form a switch array, and these control switches can realize synchronous playback of an audio signal on multiple preset sound transmission areas. Control the on/off of each control switch.
  • An audio input interface AU-in can output the connected audio signal to all audio processors 20 at the same time, so as to realize the sound field playback of all three-dimensional areas in the entire area and play the same audio signal at the same time. It is also possible to realize any two or more than two three-dimensional area sound fields to play the same audio signal simultaneously, thereby forming an arrangement and combination of three-dimensional area sound fields to play audio at the same time. For example, when the audio system is applied to a movie theater, all the control switches connected to any one of the audio input interfaces AU-in in the multi-channel audio input interface AU-in can be controlled to be turned on, so that all three-dimensional regional sound fields in the playback hall can be realized at the same time. play.
  • the audio system When the audio system is applied to a vehicle, such as a four-seater small car, four three-dimensional sound fields are respectively set up in the driver's cab, the passenger's cab, the left rear seat and the right rear seat.
  • the audio signal can be played in the four three-dimensional area sound fields at the same time, or in the two three-dimensional area sound fields corresponding to the driver's cab and the passenger cab, or the corresponding Two three-dimensional area sound fields are played to realize the function of playing audio signals in independent zones.
  • the audio processor 20 is further configured to convert the stored vector positions between the second preset position and a plurality of the first preset positions.
  • the audio signal is processed into audio signals of multiple channels, and the audio signals of each channel are output to corresponding directional speakers.
  • each directional speaker group 10 may be set to be the same, or may be set to be different. And according to the height of the head position of the user pos1, the second preset position is set differently.
  • the first preset position and the second preset position can be determined.
  • the vector position library can be established according to the orientation information between each first preset position and the second preset position, and can also be constructed according to the frequency response generated by sounds of different intensities and frequencies at the tympanic membrane of the human ear.
  • the database before the audio signal is output to the loudspeaker, uses the vector position and the database to perform convolution operations with the head correlation function, so that the audio signal contains information on the position and distance of the sound source, thereby forming a three-dimensional audio sound field.
  • the position distance of each seat is different, and an independent audio input is set.
  • One audio processor 20 corresponds to one seat (preset sound transmission area), and the audio processor 20 can pre-store the vector information of the ultrasonic transducer connected to itself.
  • the audio processor 20 can process the audio according to the pre-stored vector information and then output it to the ultrasonic transducer connected to itself, thereby forming a The corresponding three-dimensional area sound field.
  • the audio processor 20 can also control the working state of the speakers at each first preset position according to the usage habits of the user pos1, for example, only one channel is used for sounding or multiple channels Simultaneous pronunciation etc.
  • each described audio processor 20 comprises:
  • the audio modulation circuit 21 is connected to an audio input interface AU-in, and the audio modulation circuit 21 is used to modulate the received audio signal and output it to the corresponding directional speaker;
  • An audio amplitude modulation circuit 22 two input terminals are respectively connected to the audio modulation circuit 21 and a carrier signal input end, and the audio amplitude modulation circuit 22 is used to perform amplitude modulation by accessing the modulation signal and the carrier signal;
  • the power amplifier 23 is arranged in series between the audio amplitude modulation circuit 22 and the ultrasonic transducer, and is used to amplify the audio signal and output it to the ultrasonic transducer.
  • the audio modulation circuit 21 processes the input audio signal to generate a modulation signal related to the input audio signal.
  • the audio amplitude modulation circuit 22 performs amplitude modulation on the modulation signal and the carrier signal.
  • the audio processor 20 further includes a mixer, the mixer may include an analog multiplier and a low-pass filter, and the modulation signal and the carrier signal are mixed through the analog multiplier and the low-pass filter, Then the mixed signal is amplified by the power amplifier circuit and then output.
  • the amplitude modulation signal can be obtained according to the following formula:
  • u AM (t) U cm (1+m cos2 ⁇ f ⁇ t)cos2 ⁇ f c t (8)
  • k a is a proportional constant determined by the modulation circuit.
  • the audio processor 20 modulates the input audio signal, which is then emitted by the ultrasonic transducer.
  • the ultrasonic wave emitted by the ultrasonic transducer propagates in the air, and the input audio signal can be generated in the sound beam of its directional propagation, which can realize the directional propagation of the audio signal.
  • the present application also proposes a control method of an audio system, the audio system includes a plurality of directional loudspeaker groups, each of the directional speaker groups is arranged in a preset sound transmission area; the control method of the audio system includes :
  • Step S100 acquiring an audio system control command
  • the audio system control instruction may be a voice instruction, may also be a button instruction, or may be a control instruction automatically generated by a sensor or the like.
  • the audio system control command can be used to independently control the work of one directional speaker group, or to control multiple directional speaker groups to work at the same time, which can be controlled according to the actual application requirements of customers.
  • Step S200 according to the acquired audio system control instruction, control a corresponding directional speaker group among the plurality of directional speaker groups to work, so as to play an audio signal in the corresponding preset sound transmission area.
  • the audio system can be applied to places such as vehicles with independent acoustic environment requirements.
  • This embodiment takes the vehicle as an example.
  • the vehicle has multiple seats, and each seat is correspondingly equipped with a directional speaker group.
  • Each directional loudspeaker group forms a three-dimensional regional sound field when working, and each directional loudspeaker group can be independently controlled by audio system control commands.
  • each directional speaker group can be in a different state, and play an audio signal corresponding to the audio system control instruction.
  • the audio system when the audio system is applied to a vehicle, such as a four-seater small car, four three-dimensional sound fields are respectively set up in the driver's cab, the passenger's cab, the left rear seat and the right rear seat.
  • the directional loudspeaker group corresponding to the cab is controlled to work, and the voice navigation is played.
  • the directional loudspeaker group corresponding to the co-pilot is controlled to work, and the corresponding music is played.
  • Other directional loudspeaker groups (such as the rear seat) that have not received the audio system control command do not play audio signals.
  • the HIA can control all three-dimensional area sound fields in the entire area to play the same audio signal at the same time. It is also possible to control any two or more than two three-dimensional area sound fields to play the same audio signal at the same time, so as to form an arrangement and combination of three-dimensional area sound fields to play audio at the same time.
  • the audio signal can be played in four three-dimensional area sound fields at the same time, or can be played in two three-dimensional area sound fields corresponding to the driver's cab and the passenger cab, or the driver's cab and the left rear seat. The corresponding two three-dimensional area sound fields are played, so as to realize the audio signal independent zone playback function.
  • the control method of the audio system also includes the following steps:
  • Step S300 acquiring the target position of the user within the preset sound transmission area
  • the target position of the user may be when the user pos1 is in the preset sound transmission area, such as sitting in the preset sound transmission area, or lying in the preset sound transmission area, and so on.
  • the user target position may specifically be the position of the head of the user pos1 within the preset sound transmission area, and specifically may be the midpoint between the listener's two ears.
  • the directional speaker when the directional speaker is installed, the sound outlet of the directional speaker can be directed toward the position of the head.
  • the second preset position can be a fixed position or an adjustable position. When the user's target position is set to a fixed position, each directional speaker is fixed on the first preset position
  • Step S400 adjusting the angle of the sound outlet of the corresponding directional speaker in the directional speaker group according to the user target position.
  • the user's target position is an adjustable position, for example, when changing from sitting to lying on the back, the head position may be offset.
  • the angle of the sound outlet of the speaker achieves the purpose of adjusting the second preset position, so that the sound radiation direction of the directional speaker always follows the user pos1.
  • it can be adjusted manually, or by setting a camera, a sensor, such as an infrared sensor, to detect the position of the user's pos1 head, and then drive the directional speaker to move through a motor to adjust the second preset position.
  • the present application also proposes a control device for an audio system, including the above-mentioned audio system.
  • a memory and a processor wherein the memory stores a control program of the audio system, and when the control program of the audio system is executed by the processor, the steps of the above audio system control method are realized.
  • the detailed structure of the audio system can refer to the above-mentioned embodiments, and will not be repeated here; it can be understood that, since the above-mentioned audio system is used in the control device of the audio system of the present application, the implementation of the control device of the audio system of the present application
  • the example includes all the technical solutions of all the embodiments of the above-mentioned audio system, and the achieved technical effects are also completely the same, and will not be repeated here.
  • the memory can be used to store software programs and various data.
  • the memory can mainly include a program storage area and a data storage area.
  • the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, etc.); Created data (such as audio data, etc.) etc. are used.
  • the processor is the control center of the audio system applied to the vehicle or other equipment. It uses various interfaces and lines to connect the various parts of the entire mobile terminal, and runs or executes software programs and/or modules stored in the memory, and calls stored in the memory. Execute various functions of the mobile terminal and process data, so as to monitor the mobile terminal as a whole.
  • the processor can include one or more processing units; optionally, the processor can integrate an application processor and a modem processor.
  • the application processor mainly handles the operating system, user interface and application programs, etc.
  • the modem The tuner processor mainly handles wireless communication.
  • the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation.
  • the technical solution of the present application can be embodied in the form of a software product in essence or in other words, the part that contributes to the prior art, and the computer software product is stored in one of the above storage media (such as ROM/RAM, magnetic CD, CD), including several instructions to make a terminal device (which may be a mobile phone, computer, server, controlled terminal, or network device, etc.) execute the method of each embodiment of the present application.
  • the present application also proposes a vehicle, and the audio system control device in the above embodiments of the present application can be applied to the vehicle.
  • the vehicle includes a cavity 100 and an audio system as described above; wherein,
  • the audio system is disposed on and/or in the cavity 100 .
  • the vehicle includes a cavity 100 and an audio system as described above.
  • the detailed structure of the audio system can refer to the above-mentioned embodiment, and will not be repeated here; it can be understood that, since the above-mentioned audio system is used in the vehicle of the present application, the embodiment of the vehicle of the present application includes all of the above-mentioned audio system. All the technical solutions of the embodiments, and the achieved technical effects are also completely the same, and will not be repeated here.
  • the audio system can be applied to vehicles such as automobiles, trains, airplanes, etc., and the present embodiment is illustrated by taking the application in a car as an example.
  • the speaker groups in the audio system can be configured according to the number of seats 200 of the vehicle. Setting, each loudspeaker can be arranged on the console, also can be arranged on the ceiling of vehicle body, can also be arranged on the seat 200 of front row.
  • the speakers may be positioned toward the user's head, such as facing the face, and radiate audio from front to back toward the user. It can also be set towards the top of the user's head, and the speakers can also be set on the respective seats to radiate audio from the back to the front of the user.
  • the present application applies the audio system to vehicles, by setting corresponding directional speaker groups 10 on corresponding seats, and each group includes directional speakers, and a plurality of directional speakers (10a, 10b, 10c) are separately arranged on corresponding seats.
  • the first preset position realize that multiple directional loudspeakers (10a, 10b, 10c) respectively direct the second preset position to radiate sound waves when working, so as to form a three-dimensional area in the preset sound transmission area (around the seat) sound field.
  • the present application can radiate sound waves to a designated position according to actual application requirements, so that the user pos1 in the preset sound transmission area can receive the audio signal played by the directional speaker group 10, while the user outside the sound field in other three-dimensional areas The local area cannot receive the audio signal played by the directional speaker group 10, so as to realize the audio signal independent zone playback function, thereby meeting the needs of users on different seats.
  • the vehicle also includes:
  • the audio system has a plurality of directional speakers (10a, 10b, 10c) groups 10, each of the directional speaker groups 10 is set corresponding to one of the seats 200.
  • each seat 200 is correspondingly provided with a directional loudspeaker group 10, and each directional loudspeaker group 10 forms a three-dimensional regional sound field when working, and the distance between the left and right positions of the general car occupants is relatively close, and the distance is about 1m.
  • the front and rear occupant positions are about 1.5m farther away. Due to sound propagation characteristics, the farther the distance, the lower the sound pressure, so if the left and right occupants have better audio separation, the audio separation between the front and rear occupants will be better.
  • the directional loudspeaker group at the driver's position works, and the directional speaker groups 10 at other positions do not work for testing, and the driving position is tested respectively, as shown in Figure 5, which shows the driving position and the passenger position.
  • the frequency response curve shows that the frequency response at the driver's position is above 90dB, while the frequency response at the co-pilot's position is below 60dB, while the background noise of the general car environment is above 60dB, so it can be explained that the directional speaker group at the driver's position 10 When working, the co-pilot method perceives the audio information of the driver's seat and realizes the function of independent audio partitioning.
  • the vehicle further includes a control assembly electrically connected to the audio system.
  • the control component may include a central controller, which corresponds to the control switches provided for each directional speaker group 10 of the audio system.
  • the control switches may be manual control switches, such as touch screens, buttons, etc., or may be centrally controlled by the central controller.
  • the central controller is electrically connected with the audio system, and can control the audio processor 20 and the control switch in the audio system to operate in call signal receiving mode, talking mode, recording mode, voice recognition mode, broadcast receiving mode, etc. , convert the audio data received or stored in the memory into an audio signal and output it as sound.
  • the control components can also include but not limited to engine temperature controller, cold air heating fan controller, warning lights, different blowing mode controllers, defogging device, front defogging device.

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Abstract

本申请公开一种音频系统其控制方法、装置，该音频系统包括：指向性扬声器组，包括多个指向性扬声器，多个指向性扬声器分设于对应的第一预设位置；其中，多个指向性扬声器在工作时，分别定向第二预设位置辐射声波，以在预设传音区域内形成三维区域声场，第一预设位置和第二预设位置位于预设传音区域内。本申请实现了音频信号独立分区播放功能，有利于提高用户音频播放的私密性，同时可以满足处于同一空间内，不同用户对音频信号的需求。

Description

音频系统及其控制方法、装置
本申请要求于2021年09月07日提交中国专利局、申请号202111046274.0、发明名称为“音频系统及其控制方法、装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及智能音频控制技术领域，特别涉及一种音频系统其控制方法、装置。
背景技术
在智能化的大背景下，交通工具，例如汽车音频信号的种类越来越多，如音乐、导航提示音、转向提示音、报警声等。多种声音在车内长时间的混杂，会导致车内乘客的烦恼度增强，期望拥有独立声环境的需求也随之增加。例如，驾驶员在驾驶的同时想听音乐而其他乘客在休息，此时最佳的音乐播放方式是仅使驾驶员听到音乐，而其他乘客听不到或者可听到的音乐音量相对很小。然而，目前市面上的汽车产品车内音频系统一旦开启，车内全部人员将同时感知，不同人员的需求不同，无法得到满足。
发明内容
本申请的主要目的是提出一种音频系统其控制方法、装置，旨在实现音频信号独立分区播放的功能。
为实现上述目的，本申请提出一种音频系统，所述音频系统包括：
指向性扬声器组，包括多个指向性扬声器，多个所述指向性扬声器分设于对应的第一预设位置；其中，
多个所述指向性扬声器在工作时，分别定向第二预设位置辐射声波，以在预设传音区域内形成三维区域声场，所述第一预设位置和第二预设位置位于所述预设传音区域内。
可选地，所述指向性扬声器组的数量为多个，每一所述指向性扬声器组分设于一所述预设传音区域内。
可选地，所述音频系统还包括：
多个音频输入接口，所述音频输入接口的数量与所述指向性扬声器组的数量对应，每一所述音频输入接口接入一路音频信号；
多个音频处理器，每一所述音频处理器的输入端与一所述音频输入接口连接，每一所述音频处理器的多个输出端与一组所述指向性扬声器组的多个所述指向性扬声器一一对应连接；其中，
每一所述音频处理器用于将接入的音频信号转换为多个声道的音频信号后，将各个所述声道的音频信号输出至对应的指向性扬声器。
可选地，所述音频系统还包括：
多个控制开关，每两个所述音频处理器的输入端之间串联设置有一所述控制开关；其中，
在所述控制开关闭合时，与所述控制开关连接的两个所述音频处理器将接入的音频信号进行处理后，输出至各自对应的指向性扬声器，以实现音频信号在多个所述预设传音区域内同步播放。
可选地，所述音频处理器还用于根据存储的所述第二预设位置与多个所述第一预设位置之间的矢量位置，将所述音频信号处理为多个声道的音频信号，并将各个所述声道的音频信号输出至对应的指向性扬声器。
可选地，所述指向性扬声器为超声波换能器。
可选地，每一所述音频处理器包括：
音频调制电路，与一所述音频输入接口连接，所述音频调制电路用于将接入的音频信号进行调制后输出至对应的所述超声波换能器。
本申请还提出一种音频系统的控制方法，所述音频系统包括多个指向性扬声器组，每一所述指向性扬声器组分设于一所述预设传音区域内；音频系统的控制方法包括：
获取音频系统控制指令；
根据获取的所述音频系统控制指令，控制多个所述指向性扬声器组中对应的指向性扬声器组工作，以在对应的所述预设传音区域内播放音频信号。
可选地，所述音频系统的控制方法还包括以下步骤：
获取预设传音区域内用户目标位置；
根据所述用户目标位置调整对应的所述指向性扬声器组中的指向性扬声器出音口的角度。
本申请还提出一种音频系统的控制装置，包括如上所述的音频系统；以 及，
存储器、处理器，所述存储器上存储有音频系统的控制程序，所述音频系统的控制程序被所述处理器执行时实现如上所述的音频系统的控制方法的步骤。
本申请还提出一种交通工具，包括腔体及如上所述的音频系统；其中，
所述音频系统设置于所述腔体上和/或所述腔体内。
可选地，所述交通工具还包括：
多个座椅，所述音频系统具有多个指向性扬声器组，每一所述指向性扬声器组对应一所述座椅设置。
可选地，所述交通工具还包括控制组件，所述控制组件与所述音频系统电连接。
本申请音频系统通过设置指向性扬声器组，并且每组包括指向性扬声器，将多个指向性扬声器分设于对应的第一预设位置，意识多个指向性扬声器在工作时，分别定向第二预设位置辐射声波，以在预设传音区域内形成三维区域声场。本申请可以根据实际应用需求，将声波辐射至指定的位置，以使处于预设传音区域内的用户pos1能够接收到该指向性扬声器组播放的音频信号，而在其他三维区域声场以外的地方则不能接收到该指向性扬声器组播放的音频信号，以实现音频信号独立分区播放功能。本申请有利于提高用户音频播放的私密性，同时可以满足处于同一空间内，处于不同位置的用户对音频信号的需求。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本申请音频系统工作时形成的三维区域声场示意图；
图2为本申请音频系统一实施例的电路结构示意图；
图3为图2中音频处理器一实施例的电路结构示意图；
图4为本申请音频系统应用于交通工具一实施例的结构示意图；
图5为本申请交通工具驾驶位位置和副驾驶位置的频率响应曲线；
图6为本申请音频系统的控制方法一实施例示出的流程示意图；
图7为本申请音频系统的控制方法另一实施例示出的流程示意图。
附图标号说明：
标号 名称 标号 名称
10 指向性扬声器组 23 功率放大器
10a，10b，10c 指向性扬声器 S1、S2、S3 控制开关
20 音频处理器 AU-in 音频输入接口
21 音频调制电路 100 腔体
22 音频调幅电路 200 座椅
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将参照附图更详细地描述本公开的示例性实施方式。虽然附图中显示了本公开的示例性实施方式，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施方式所限制。相反，提供这些实施方式是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
需要注意的是，除非另有说明，本申请使用的技术术语或者科学术语应当为本申请所属领域技术人员所理解的通常意义。
另外，术语“第一”和“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请提出一种音频系统。
参照图1至图5，在本申请一实施例中，该音频系统包括：
指向性扬声器组10，包括多个指向性扬声器(10a，10b，10c)，多个所述指向性扬声器(10a，10b，10c)分设于对应的第一预设位置；其中，
多个所述指向性扬声器(10a，10b，10c)(10a，10b，10c)在工作时，分别定向第二预设位置辐射声波，以在预设传音区域内形成三维区域声场，所述第一预设位置和第二预设位置位于所述预设传音区域内。
本实施例中，第一预设位置为各个指向性扬声器的安装位置，第二预设位置为指向性扬声器辐射音频信号的目标位置，例如用户pos1能够感知音频信号的较佳位置。该位置可以是在用户pos1处于预设传音区域内时，例如坐于该于预设传音区域，或者卧于该预设传音区域内等用户pos1在该预设传音区域的常用状态位置。该第二预设位置具体可以为用户pos1在预设传音区域内，头部所处的位置，具体可以为听众两耳之间的中点。并且在安装指向性扬声器时，可以将指向性扬声器的出音口朝向头部所处的位置。并且，第二预设位置可以为一固定位置，也可以为可调节位置，在第二预设位置设置为固定位置时，每个指向性扬声器固定于第一预设位置上。在第二预设位置为可调位置时，例如用于在由坐立改为仰躺时，该头部位置可能会偏移，此时可以通过调节指向性扬声器的安装位置或者调节指向性扬声器出音口的角度，达到调节第二预设位置的目的，使得指向性扬声器的声音辐射方向始终跟随用户pos1。在具体应用时，可以通过手动调节，也可以通过设置摄像头、传感器，例如红外传感器等检测用户pos1头部的位置，再通过电机等驱动指向性扬声器运动，以调节第二预设位置。
一组指向性扬声器组10中指向性扬声器的数量可以为两个，也可以为三个，四个，具体可以根据音频系统应用的区域及产品体积等进行设置，此处不作限制。并且，多个指向性扬声器(10a，10b，10c)之间可以等间距设置，或者非等间距设置，仅需保证多个指向性扬声器(10a，10b，10c)声源传播方向形成的矢量位置能够指向第二预设位置。当设置为两个时，两个指向性扬声器可以设置在第二预设位置的两侧，并且，每个指向性扬声器设置在第一预设位置上的距离，与第二预设位置之间的距离可以等间距。其中一个指向性扬声器距二预设位置的距离，与其中另一个指向性扬声器距二预设位置的距离，以及两个指向性扬声器之间的距离相等。当设置为三个时，三个指 向性扬声器可以分别设置在用于处于预设传音区域的左右手两侧，以及头部上方。指向性扬声器可以采用能够定向传播音频信号的扬声器来实现，例如线性阵列扬声器、超声波扬声器等。本申请以下各示例性的实施例中，以超声波扬声器，尤其是超声波换能器为例进行说明。根据超声波的定向传播，得到如下的非奇次波动方程：
Figure PCTCN2021138408-appb-000001
式中
Figure PCTCN2021138408-appb-000002
ρ 0为流体密度；p 1为基波声压；p s为二次波声压；c 0为声速；β为媒质的非线性参数。
求解式(1)可得，非线性相互作用后产生二次波的声压：
Figure PCTCN2021138408-appb-000003
式中r为观测点的位置向量；r′为声源位置向量；v为非线性作用区域。由式(1)、(2)可知，经单频声g(t)＝sinωt调制后的超声信号，经由超声波换能器发射后，在距轴向x远处的调制波声压：
p 1＝p 0[1+mg(t-x/c 0)]e -αxsinω 0(t-x/c 0)  (3)
式中p 0为超声声压；ω 0为超声波频率；m为调制深度，表示载波振幅受调制信号控制的程度；α为载波频率。超声波换能器发射出去的超声波在空气中传播，在其主声束里可产生单频可听声g(t)的声信号源，声源方程为：
Figure PCTCN2021138408-appb-000004
式(4)右边第二部分为二次谐波成分，即失真成分。由式(3)、(4)得解调后声压p s在超声波换能器阵列轴向r处声压为：
Figure PCTCN2021138408-appb-000005
从式(5)可知超声波换能器发射出去的超声波在空气中传播解调后的可听声波也依然沿轴向传播，有极强的指向性。针对三维区域中声源方向的还 原，根据矢量的幅度平移(Vector—based amplitude panning，VBAP)技术，VBAP利用2个或3个等多个指向性扬声器(10a，10b，10c)的位置的单位向量合成出虚拟声源的单位向量，达到构建声源传播方向的目的。例如每组扬声器组中扬声器的数量为3个时，将3个扬声器可以形成三个声道，参照图1，分别将扬声器形成的三个声道标记为声道1、声道2和声道3。3个扬声器的单位向量视为基向量，虚拟声源的方向由它们的线性组合得到。设3个扬声器距离第二预设位置的单位矢量分别为l 1，l 2，l 3，每个扬声器的音频信号的增益为g 1，g 2，g 3，声源单位矢量为l 0，则l 0可表为：
l 0＝g 1l 1+g 2l 2+g 3l 3  (6)
于是可求解增益得
Figure PCTCN2021138408-appb-000006
式中l 1＝[l i1，l i2，l i3]，i＝1，2，3。
根据式(6)(7)可得按照VBAP原理，3个扬声器可以构建三维区域声场。如此，基于超声波的声波定向传播技术，通过超声波换能器将接收到高频电能转换为机械振动，并由超声换能器发射到空气中，借助超声波本身的高指向性，即实现了声音定向传播。
本申请音频系统通过设置指向性扬声器组10，并且每组包括指向性扬声器，将多个指向性扬声器(10a，10b，10c)分设于对应的第一预设位置，意识多个指向性扬声器(10a，10b，10c)在工作时，分别定向第二预设位置辐射声波，以在预设传音区域内形成三维区域声场。本申请可以根据实际应用需求，将声波辐射至指定的位置，以使处于预设传音区域内的用户pos1能够接收到该指向性扬声器组10播放的音频信号，而在其他三维区域声场以外的地方则不能接收到该指向性扬声器组10播放的音频信号，以实现音频信号独立分区播放功能。本申请有利于提高用户pos1音频播放的私密性，同时可以满足处于同一空间内，不同用户pos1对音频信号的需求。
参照图1至图5，在一实施例中，所述指向性扬声器组10的数量为多个， 每一所述指向性扬声器组10分设于一所述预设传音区域内。
本实施例中，音频系统可以应用于汽车、火车、飞机等交通工具上，还可以适用于电影院、会议室等等公共区域内。在汽车、火车、飞机等交通工具，以及于电影院、会议室等等公共区域不止一个用户pos1，以汽车举例而言，目前的音箱设备在播放音频信号时，车内全部人员将同时感知，不同人员的需求不同，无法得到满足，并且音频系统也停留在传统的直接回放，无法实现音频三维区域回放。例如司机需要听导航信息，副驾驶需要音乐，而后排乘员休息需要安静，无法同时得到满足，回放音乐无法实现音乐的三维重现。
为此，本实施例中指向性扬声器组10设置为多组，每组指向性扬声器组10可以构建一个三维区域声场，使得三维区域音频分区而独立。预设传音区域也根据音频系统适用的场景不同，设置于对应的地方，具体可以为在车辆车厢中的座位位置，电影院中的座位、安乐椅、活动靠背扶手椅、或者在家庭娱乐室的沙发座位位置等等每个用户pos1在该区域内的活动位置。本实施例可以对应每个座椅设置一个指向性扬声器组10。并且，多个所述指向性扬声器组10呈阵列设置。各个预设传音区域之间相互间隔，或者每个指向性扬声器组10辐射的音频信号仅在与指向性扬声器组10对应的预设传音区域内能够被用户pos1感知到，而不会被其他区域的用户pos1感知到。
参照图1至图5，在一实施例中，所述音频系统还包括：
多个音频输入接口AU-in，所述音频输入接口AU-in的数量与所述指向性扬声器组10的数量对应，每一所述音频输入接口AU-in接入一路音频信号；
多个音频处理器20，每一所述音频处理器20的输入端与一所述音频输入接口AU-in连接，每一所述音频处理器20的多个输出端与一组所述指向性扬声器组10的多个所述指向性扬声器(10a，10b，10c)一一对应连接；其中，
每一所述音频处理器20用于将接入的音频信号转换为多个声道的音频信号后，将各个所述声道的音频信号输出至对应的指向性扬声器。
本实施例中，音频输入接口AU-in可以数字音频接入端口，也可以是模拟音接入端口，多个音频输入接口AU-in分别接入一路音频信号，音频处理器20可以对音频信号进行解码、调制、放大、滤波、混频等处理，并且每个音频处理器20会根据每组指向性扬声器组10中扬声器的数量，产生多个声道的音频信号后，输出给每个指向性扬声器，每个指向性扬声器会根据接收 到的音频信号，转换为各自对应声道的机械振动。每个音频输入接口AU-in接入的音频信号可以相同，也可以不同，例如在音频系统应用于汽车等交通工具时，并在驾驶室，副驾驶室，左后座和右后座分别设立了四个三维区域声场，驾驶室对应的三维区域声场可以播放司机需要的导航信息，副驾驶对应的三维区域声场则可以播放音乐，左后座和右后座对应三维区域声场可以不进行音频播放，也即与左后座和右后座对应三维区域声场对应的音频输入接口AU-in未接入音频信号。
参照图1至图5，在一实施例中，所述音频系统还包括：
多个控制开关(S1、S2、S3)，每两个所述音频处理器20的输入端之间串联设置有一所述控制开关(S1、S2、S3)；其中，
在所述控制开关(S1、S2、S3)闭合时，与所述控制开关连接的两个所述音频处理器20将接入的音频信号进行处理后，输出至各自对应的指向性扬声器，以实现多个所述预设传音区域音频同步播放。
本实施例中，控制开关(S1、S2、S3)为双向导通开关，也即一个音频输入接口AU-in接入的音频信号可以通过控制开关输出至另一音频处理器20的输入端，或者另一音频输入接口AU-in一个音频输入接口AU-in接入的音频信号可以输入该音频处理器20。并且，每音频输入接口AU-in之间均串联设置有一个控制开关。多个控制开关(S1、S2、S3)可以组成开关阵列，这些控制开关可以实现一个音频信号在多个预设传音区域上同步播放。控制各个控制开关的通/断一个音频输入接口AU-in可以同时向所有的音频处理器20输出接入的音频信号，实现整个区域内所有三维区域声场播放同时播放同一音频信号。也可以实现任意两个或者两个以上三维区域声场播放同时播放同一音频信号，从而形成三维区域声场同时播放音频的排列组合。例如，在音频系统应用于电影院时，可以控制多路音频输入接口AU-in中与任意一路音频输入接口AU-in连接的控制开关全部导通，即可实现播放厅中所有的三维区域声场同时播放。在音频系统应用于交通工具，例如四座的小型轿车中时，分别在驾驶室，副驾驶室，左后座和右后座分别设立了四个三维区域声场。通过控制控制开关的通/断，音频信号可以同时在四个三维区域声场进行播放，也可以在驾驶室和副驾驶室对应的两个三维区域声场进行播放，或者驾驶室和左后座对应的两个三维区域声场进行播放，以实现音频信号独立分区播放功能。
参照图1至图5，在一实施例中，所述音频处理器20还用于根据存储的所述第二预设位置与多个所述第一预设位置之间的矢量位置，将所述音频信号处理为多个声道的音频信号，并将各个所述声道的音频信号输出至对应的指向性扬声器。
可以理解的是，各个指向性扬声器组10之间对应的第一预设位置和第二预设位置可能设置得相同，也可以设置得不同。并且根据用户pos1头部位置的高低不同，第二预设位置设置得也就不同，本实施例可以在各个指向性扬声器安装于第一预设位置后，确定第一预设位置与第二预设位置的矢量位置，确定各个指向性扬声器的工作参数。具体地，可以根据各个第一预设位置与第二预设位置之间的方位信息建立矢量位置库，并且还可以根据不同强度、不同频率的声音在人耳鼓膜处产生的频响，来构建数据库，在音频信号输出到扬声器之前，利用矢量位置及数据库与头部相关函数进行卷积运算，使声频信号中包含声源位置、距离的信息，从而形成三维音频声场。例如应用于中时，对应每个座椅的位置距离不同，设置有独立的音频输入。一个音频处理器20对应一个座椅(预设传音区域)，音频处理器20中可以预先存储自身所连接超声波换能器的矢量信息。当音频信号输入到音频处理器20时，音频处理器20可以根据预先存储的矢量信息，将音频进行处理后分别输出到自身所连接的超声波换能器，从而在每个预设传播区域内形成对应的三维区域声场。
可以理解的是，在其他实施例中，音频处理器20也可以根据用户pos1的使用习惯，控制每个第一预设位置上的扬声器的工作状态，例如仅一个声道发音或者多个声道同时发音等。
参照图2，在一实施例中，每一所述音频处理器20包括：
音频调制电路21，与一所述音频输入接口AU-in连接，所述音频调制电路21用于将接入的音频信号进行调制后输出至对应的所述指向性扬声器；
音频调幅电路22，两个输入端分别与所述音频调制电路21和载波信号输入端连接，所述音频调幅电路22用于将接入所述调制信号与载波信号进行调幅；
功率放大器23，串联设置于音频调幅电路22及超声波换能器之间，用于对音频信号进行放大后输出至超声波换能器。
本实施例中，音频调制电路21对输入的音频信号进行处理，产生与输入 的音频信号相关的调制信号。音频调幅电路22将调制信号与载波信号进行调幅。在一些实施例中，音频处理器20还包括混频器，混频器可以包括模拟乘法器与低通滤波器，将调制信号与载波信号通过模拟乘法器与低通滤波器进行混频处理，然后将混频后的信号经功率放大电路进行功率放大后输出。
其中幅值为U Ωm的信号作为调制信号，载波频率f c＝40kHz，幅值为U cm作为载波信号，则调幅信号可以根据以下公式获得：
u AM(t)＝U cm(1+m cos2πf Ωt)cos2πf ct  (8)
式中
Figure PCTCN2021138408-appb-000007
k a为由调制电路决定的比例常数。
据此，音频处理器20对输入的音频信号进行调制，然后由超声波换能器发出。根据超声定向传播理论基础，超声波换能器发射出去的超声波在空气中传播，在其定向传播的声束里可产生输入的音频信号，即可实现音频信号的定向传播。
本申请还提出一种音频系统的控制方法，所述音频系统包括多个指向性扬声器组，每一所述指向性扬声器组分设于一所述预设传音区域内；音频系统的控制方法包括：
步骤S100、获取音频系统控制指令；
本实施例中，音频系统控制指令可以是语音指令，也可以是按键指令，还可以是通过传感器等自动生成的控制指令等等。音频系统控制指令可以用于独立控制一个指向性扬声器组工作，也可以控制多个指向性扬声器组同时工作，具体可以根据客户的实际应用需求进行控制。
步骤S200、根据获取的所述音频系统控制指令，控制多个所述指向性扬声器组中对应的指向性扬声器组工作，以在对应的所述预设传音区域内播放音频信号。
本实施例中，音频系统可以应用于车载等，具有有独立声环境的需求的场所，本实施例以车载为例，车载具有多个座椅，每个座椅对应设置有一个指向性扬声器组，每个指向性扬声器组工作时形成一三维区域声场，各个指向性扬声器组可以受音频系统控制指令的独立控制。响应获取到的音频系统控制指令，各个指向性扬声器组可以处于不同的状态，并且播放与音频系统控制指令对应的音频信号。例如，在音频系统应用于交通工具，例如四座的 小型轿车中时，分别在驾驶室，副驾驶室，左后座和右后座分别设立了四个三维区域声场。当接收到表征驾驶室语音导航的音频系统控制指令时，则控制与驾驶室对应的指向性扬声器组工作，并播放语音导航。当接收到表征副驾驶音乐播放的音频系统控制指令时，则控制与副驾驶对应的指向性扬声器组工作，并播放对应的音乐。其他(如后座)未接收到音频系统控制指令的指向性扬声器组则不播放音频信号。此外，根据接收到的音频系统控制指令，HIA可以控制整个区域内所有三维区域声场播放同时播放同一音频信号。也可以控制任意两个或者两个以上三维区域声场播放同时播放同一音频信号，从而形成三维区域声场同时播放音频的排列组合。例如，根据接收到的音频系统控制指令，音频信号可以同时在四个三维区域声场进行播放，也可以在驾驶室和副驾驶室对应的两个三维区域声场进行播放，或者驾驶室和左后座对应的两个三维区域声场进行播放，以实现音频信号独立分区播放功能。
所述音频系统的控制方法还包括以下步骤：
步骤S300、获取预设传音区域内用户目标位置；
本实施例中，用户目标位置可以是在用户pos1处于预设传音区域内时，例如坐于该于预设传音区域，或者卧于该预设传音区域内等用户pos1在该预设传音区域的常用状态位置。该用户目标位置具体可以为用户pos1在预设传音区域内，头部所处的位置，具体可以为听众两耳之间的中点。并且在安装指向性扬声器时，可以将指向性扬声器的出音口朝向头部所处的位置。并且，第二预设位置可以为一固定位置，也可以为可调节位置，在用户目标位置设置为固定位置时，每个指向性扬声器固定于第一预设位置上
步骤S400、根据所述用户目标位置调整对应的所述指向性扬声器组中的指向性扬声器出音口的角度。
本实施例中，用户目标位置为可调位置，例如用于在由坐立改为仰躺时，该头部位置可能会偏移，此时可以通过调节指向性扬声器的安装位置或者调节指向性扬声器出音口的角度，达到调节第二预设位置的目的，使得指向性扬声器的声音辐射方向始终跟随用户pos1。在具体应用时，可以通过手动调节，也可以通过设置摄像头、传感器，例如红外传感器等检测用户pos1头部的位置，再通过电机等驱动指向性扬声器运动，以调节第二预设位置。
本申请还提出一种音频系统的控制装置，包括如上所述的音频系统；以及，
存储器、处理器，所述存储器上存储有音频系统的控制程序，所述音频系统的控制程序被所述处理器执行时实现如上所述的音频系统的控制方法的步骤。
该音频系统的详细结构可参照上述实施例，此处不再赘述；可以理解的是，由于在本申请音频系统的控制装置中使用了上述音频系统，因此，本申请音频系统的控制装置的实施例包括上述音频系统全部实施例的全部技术方案，且所达到的技术效果也完全相同，在此不再赘述。
本实施例中，存储器可用于存储软件程序以及各种数据。存储器可主要包括存储程序区和存储数据区，可选地，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如声音播放功能功能等)等；存储数据区可存储根据手机的使用所创建的数据(比如音频数据等)等。
处理器是音频系统应用于车载或者其他设备的控制中心，利用各种接口和线路连接整个移动终端的各个部分，通过运行或执行存储在存储器内的软件程序和/或模块，以及调用存储在存储器内的数据，执行移动终端的各种功能和处理数据，从而对移动终端进行整体监控。处理器可包括一个或多个处理单元；可选地，处理器可集成应用处理器和调制解调处理器，可选地，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在如上的一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，被控终端，或者网络设备等)执行本申请每个实施例的方法。
本申请还提出一种交通工具，本申请上述实施例的音频系统的控制装置可以应用于交通工具。
参照图4，该交通工具包括腔体100及如上所述的音频系统；其中，
所述音频系统设置于所述腔体100上和/或所述腔体100内。所述交通工具包括腔体100及如上所述的音频系统。该音频系统的详细结构可参照上述实施例，此处不再赘述；可以理解的是，由于在本申请交通工具中使用了上 述音频系统，因此，本申请交通工具的实施例包括上述音频系统全部实施例的全部技术方案，且所达到的技术效果也完全相同，在此不再赘述。
本实施例中，音频系统可以应用于汽车、火车、飞机等等交通工具上，本实施例以应用于小轿车为例进行说明，音频系统中的扬声器组可以根据交通工具的座椅200数量进行设置，各个扬声器可以设置于操作台上，也可以设置于车身的顶棚上，还可以设置于前排的座椅200上。扬声器可以设置于朝向用户的头部，例如面孔设置，由前向后朝用户辐射音频。也可以朝向用户的头顶设置，扬声器还可以设置于各自座椅上，由后向前朝用户辐射音频。本申请将音频系统应用于交通工具上，通过在对应各个座椅设置对应的指向性扬声器组10，并且每组包括指向性扬声器，将多个指向性扬声器(10a，10b，10c)分设于对应的第一预设位置，意识多个指向性扬声器(10a，10b，10c)在工作时，分别定向第二预设位置辐射声波，以在预设传音区域(座椅周围)内形成三维区域声场。本申请可以根据实际应用需求，将声波辐射至指定的位置，以使处于预设传音区域内的用户pos1能够接收到该指向性扬声器组10播放的音频信号，而在其他三维区域声场以外的地方则不能接收到该指向性扬声器组10播放的音频信号，以实现音频信号独立分区播放功能，从而满足不同座椅上用户的需求。
参照图4在一实施例中，所述交通工具还包括：
多个座椅200，所述音频系统具有多个指向性扬声器(10a，10b，10c)组10，每一所述指向性扬声器组10对应一所述座椅200设置。
本实施例中，每个座椅200对应设置有一个指向性扬声器组10，每个指向性扬声器组10工作时形成一三维区域声场，并且一般汽车乘员左右位置距离较近，距离在1m左右，前后乘员位置较远1.5m左右。由于声音传播特性，距离越远，声压越低，所以如果左右乘员拥有较好音频分离，前后乘员间的音频分离将更好。本实施例以驾驶位位置的指向性扬声器组工作，其余位置的指向性扬声器组10不工作进行测试，分别测试驾驶位位置，如图5所示，图5为驾驶位位置和副驾驶位置的频率响应曲线，驾驶位位置的频响达到90dB以上，而同时在副驾驶位置的频响在60dB以下，而一般汽车环境背景噪音在60dB以上，所以可以说明，在驾驶位位置的指向性扬声器组10工作时，副驾驶法感知到驾驶位的音频信息，实现了音频独立分区功能。
参照图4在一实施例中，所述交通工具还包括控制组件，所述控制组件 与所述音频系统电连接。
本实施例中，控制组件可以包括中央控制器，对应音频系统各个指向性扬声器组10设置的控制开关，该控制开关可以为手动控制开关，例如触摸屏，按键等，也可以由中央控制器集中控制。中央控制器与音频系统电连接，可以控制音频系统中的音频处理器20、控制开关工作，以在处于呼叫信号接收模式、通话模式、记录模式、语音识别模式、广播接收模式等等模式下时，将接收的或者在存储器中存储的音频数据转换成音频信号后输出为声音。控制组件还可以包括但不限于发动机温度控制器，冷风暖气风扇控制器，警报灯，不同方式的吹风方式控制器，除雾装置，前除雾装置。
以上所述仅为本申请的可选实施例，并非因此限制本申请的专利范围，凡是在本申请的申请构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。
本说明书中各个实施例采用并列或者递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同或相似部分互相参见即可。对于实施例公开的装置而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处可参见方法部分说明。

Claims (10)

  1. 一种音频系统，其特征在于，所述音频系统包括：
    指向性扬声器组，包括多个指向性扬声器，多个所述指向性扬声器分设于对应的第一预设位置；其中，
    多个所述指向性扬声器在工作时，分别定向第二预设位置辐射声波，以在预设传音区域内形成三维区域声场，所述第一预设位置和第二预设位置位于所述预设传音区域内。
  2. 如权利要求1所述的音频系统，其特征在于，所述指向性扬声器组的数量为多个，每一所述指向性扬声器组分设于一所述预设传音区域内。
  3. 如权利要求2所述的音频系统，其特征在于，所述音频系统还包括：
    多个音频输入接口，所述音频输入接口的数量与所述指向性扬声器组的数量对应，每一所述音频输入接口接入一路音频信号；
    多个音频处理器，每一所述音频处理器的输入端与一所述音频输入接口连接，每一所述音频处理器的多个输出端与一组所述指向性扬声器组的多个所述指向性扬声器一一对应连接；其中，
    每一所述音频处理器用于将接入的音频信号转换为多个声道的音频信号后，将各个所述声道的音频信号输出至对应的指向性扬声器。
  4. 如权利要求3所述的音频系统，其特征在于，所述音频系统还包括：
    多个控制开关，每两个所述音频处理器的输入端之间串联设置有一所述控制开关；其中，
    在所述控制开关闭合时，与所述控制开关连接的两个所述音频处理器将接入的音频信号进行处理后，输出至各自对应的指向性扬声器，以实现音频信号在多个所述预设传音区域内同步播放。
  5. 如权利要求2所述的音频系统，其特征在于，所述音频处理器还用于根据存储的所述第二预设位置与多个所述第一预设位置之间的矢量位置，将所述音频信号处理为多个声道的音频信号，并将各个所述声道的音频信号输出至对应的指向性扬声器。
  6. 如权利要求2至5任意一项所述的音频系统，其特征在于，所述指向性扬声器为超声波换能器。
  7. 如权利要求6所述的音频系统，其特征在于，每一所述音频处理器包括：
    音频调制电路，与一所述音频输入接口连接，所述音频调制电路用于将接入的音频信号进行调制后输出至对应的所述超声波换能器。
  8. 一种音频系统的控制方法，其特征在于，所述音频系统包括多个指向性扬声器组，每一所述指向性扬声器组分设于一所述预设传音区域内；音频系统的控制方法包括：
    获取音频系统控制指令；
    根据获取的所述音频系统控制指令，控制多个所述指向性扬声器组中对应的指向性扬声器组工作，以在对应的所述预设传音区域内播放音频信号。
  9. 如权利要求8所述的音频系统的控制方法，其特征在于，所述音频系统的控制方法还包括以下步骤：
    获取预设传音区域内用户目标位置；
    根据所述用户目标位置调整对应的所述指向性扬声器组中的指向性扬声器出音口的角度。
  10. 一种音频系统的控制装置，其特征在于，包括如权利要求1至7任意一项所述的音频系统；以及，
    存储器、处理器，所述存储器上存储有音频系统的控制程序，所述音频系统的控制程序被所述处理器执行时实现如权利要求8或9所述的音频系统的控制方法的步骤。
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