CN214851787U

CN214851787U - Rear-mounted sound system of automobile

Info

Publication number: CN214851787U
Application number: CN202120320516.XU
Authority: CN
Inventors: 郑全录; 于燕燕
Original assignee: Shen Zhen Neusound Co ltd
Current assignee: Shen Zhen Neusound Co ltd
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-11-23
Anticipated expiration: 2031-02-04

Abstract

The utility model relates to a sound system field, specific back dress sound system of car that says so, include: the system comprises an original vehicle machine, a rear-loading wire harness, an audio signal processing board, an original vehicle wire harness, a subwoofer and a sound channel loudspeaker which are arranged in an automobile; the original car machine is provided with an original car machine socket which is connected with the audio signal processing board through a rear loading wire harness; the sound channel loudspeakers are multiple and connected to one end of an original vehicle wiring harness, and the other end of the original vehicle wiring harness is connected with an original vehicle wiring harness plug and connected with the audio signal processing board through a rear-mounted wiring harness; the subwoofer includes: the bass loudspeaker box body and an active bass loudspeaker and a passive bass loudspeaker which are arranged in the bass loudspeaker box body; the audio signal processing board is connected with the active woofer through a subwoofer output cable. The utility model discloses a three frequency division system, bass are sent by the subwoofer, and the well sound speaker and the high pitch speaker of the multichannel speaker that well sound and high pitch were by send, realize that high-fidelity electroacoustic reduces, and tone quality is better.

Description

Rear-mounted sound system of automobile

Technical Field

The utility model relates to a sound system field, specific back dress sound system of car that says so.

Background

With the progress of times, the living standard of people is improved, and the development of the car networking and automatic driving technology promotes people to have higher and higher requirements on the sound quality of the car audio, but the existing car audio after-loading product in the prior art cannot meet the requirements of people, so that a brand-new car after-loading sound system with high sound quality, low cost and easy installation is urgently needed. The technical scheme and the defects of the traditional automobile after-loading system are as follows:

1. replacement speaker solution: namely, the original vehicle loudspeaker is replaced by the loudspeaker which is high in price and better in working, and the defects that the tone quality is not obviously improved, especially the bass effect is improved poorly, and the acoustic framework is not changed fundamentally because the loudspeaker still belongs to a 4.0-channel system; secondly, the price is high, and is generally more than thousands of yuan; thirdly, the installation is inconvenient, and the DIY of the owner can not be realized; and fourthly, the original loudspeaker is discarded after being detached, so that resource waste is caused.

2. Adding an active subwoofer scheme: the active subwoofer is added in the vehicle, the subwoofer is a 6-liter ultra-thin seat subwoofer or a 30-40-liter traditional active subwoofer, and the defect that if the active subwoofer is a traditional 6-liter ultra-thin seat subwoofer, the bass tone quality is poor, and if the active subwoofer is a traditional subwoofer with a volume of more than 30 liters, the active subwoofer is difficult to place due to narrow space in the vehicle and occupies valuable space in the trunk when placed in the trunk; secondly, the cost is high; thirdly, the installation is complex, the vehicle must be installed in a sound modifying shop, and the vehicle owner cannot drive the vehicle according to the DIY; fourthly, the integral beauty in the vehicle is damaged.

3. And a DSP power amplifier scheme is added: the method is characterized in that a DSP power amplifier is inserted between the output of a car machine and 4 paths of loudspeakers, and the defect is that tone quality is improved very little, because the loudspeaker is a 4-channel system and is an original loudspeaker, personal music preference is realized only through EQ tuning, the original car is provided with an EQ tuning and car owner sound effect free adjustment system, bass is not improved, and mediant is not improved; secondly, the DSP power amplifier has large volume, is not easy to place and can only be placed in a storage box in front of a copilot or under a front copilot seat; thirdly, the cost is also higher; fourthly, the repeated power amplification increases distortion.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a rear-mounted sound system of car and implementation method, the new rear-mounted system that utilizes subwoofer and rear-mounted harness that audio signal processing board has active speaker and passive speaker, it is not good to have solved the rear-mounted sound system tone quality of prior art car and has promoted, no heavy bass promptly, the mediant that the mediant was given play the role by the mediant is not good, audio signal processing board is bulky, can't set up at the back at former car machine, the subwoofer volume is too big, put the problem of difficulty and the too high problem of system cost in the car.

The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: an automobile rear audio system comprising: the system comprises an original vehicle machine, a rear-loading wire harness, an audio signal processing board, an original vehicle wire harness, a subwoofer and a sound channel loudspeaker which are arranged in an automobile;

the original car machine is provided with an original car machine socket, and the original car machine socket is connected with the audio signal processing board through a rear loading wire harness;

the sound channel loudspeakers are multiple, the sound channel loudspeakers are connected with one end of an original vehicle wiring harness, and the other end of the original vehicle wiring harness is connected with an original vehicle wiring harness plug and is connected with the audio signal processing board through a rear-mounted wiring harness;

the subwoofer includes: the bass loudspeaker box body and an active bass loudspeaker and a passive bass loudspeaker which are arranged in the bass loudspeaker box body;

the audio signal processing board is connected with an active woofer of the subwoofer through a subwoofer output cable.

The afterloading harness includes: a new vehicle machine plug, a new output socket, a rear loading plug, a rear loading input line, a rear loading output line, a rear loading straight line and a three-way power line;

the plug of the new car machine is connected with the rear-loading plug through a rear-loading input line, and the rear-loading plug is connected with the new output socket through a rear-loading output line; an original vehicle machine control line of the original vehicle wiring harness plug is connected with a new vehicle machine plug through a new output socket and a rear-loading through line;

and the positive power supply and the negative power supply of the original car wiring harness plug are respectively connected with the new car machine plug and the rear loading plug through a new output socket and a three-way power line so as to provide power supplies for the original car machine and the audio signal processing board.

The three-way power line is respectively connected with the original car machine power input end of the original car machine socket, the power input end of the original car wire harness plug and the power input end of the audio signal processing board through the new car machine plug, the new output socket and the rear loading plug so as to realize that the original car machine and the audio signal processing board are powered by positive and negative power supplies from the original car wire harness;

one end of the rear loading input line is connected with the audio output end of the original car machine socket through a new car machine plug, and the other end of the rear loading input line is connected with the input end of the audio signal processing board through a rear loading plug;

one end of the rear-mounted output line is connected with the sound channel output end of the audio signal processing board through a rear-mounted plug, and the other end of the rear-mounted output line is connected with a plurality of sound channel loudspeakers through a new output socket and an original vehicle wiring harness plug;

the rear-loading straight line is an original car machine control line, one end of the rear-loading straight line is connected with an original car machine socket through a new car machine plug, and the other end of the rear-loading straight line is connected with an original car wire harness through an original car wire harness plug through a new output socket to form straight-through.

The audio signal processing board includes: the system comprises an intermediate frequency divider, a subwoofer volume adjustment device and a subwoofer power amplifier;

the input end of the intermediate frequency divider is connected with the input end of the audio signal processing board, and the output end of the intermediate frequency divider is connected with the output end of the audio signal processing board;

the positive and negative power supplies connected with the original vehicle wiring harness plug are connected in parallel with the power supply ends of the subwoofer frequency divider and the subwoofer power amplifier through the power supply end of the audio signal processing board;

the subwoofer frequency divider is a low-pass filter, the input of the low-pass filter is audio signals of all sound channels output by the original car machine and transmitted to the subwoofer frequency divider, the bass output of the subwoofer frequency divider is input to the subwoofer power amplifier after being adjusted by the bass volume adjuster, and the power output by the subwoofer power amplifier is transmitted to the subwoofer through a subwoofer output cable.

The number of the intermediate frequency dividers is multiple, and all the intermediate frequency dividers are high-pass filters; the number of the intermediate frequency dividers is the sum of the number of the sound channels of all the sound channel loudspeakers, so that each intermediate frequency divider is connected with one corresponding sound channel loudspeaker.

Each intermediate frequency divider is 1 capacitor, the capacitor is a non-polar capacitor, and each capacitor is respectively connected with a voice coil of a corresponding sound channel loudspeaker in series to form an LC passive frequency divider.

The active bass loudspeaker is embedded into the bass box body, and the mounting plane of the active bass loudspeaker is positioned on the plane of a certain side wall of the box body; the active woofer is connected with a subwoofer amplifier of the audio signal processing board through a subwoofer output cable;

the passive woofers are arranged in pairs, and each pair of passive woofers are correspondingly arranged in the bass box body.

The subwoofer power amplifier is arranged in the subwoofer box body, or the subwoofer power amplifier, the subwoofer frequency divider and the subwoofer volume adjuster are all arranged in the subwoofer box body.

The audio signal processing board is arranged in a box body, and the box body is fixedly arranged on a rear loading wire harness or an original vehicle machine.

The ratio of the diaphragm area of the active woofer to the total diaphragm area of the passive woofer is as follows: 1: 1.5-2.5.

The utility model has the following beneficial effects and advantages:

1. the utility model discloses with low costs, only hundreds of yuan of RMB just can surpass the sound quality of sound equipment after the traditional car of thousands of yuan.

2. The utility model discloses small, easy installation, not broken line, car owner one dial one insert oneself DIY just can accomplish.

3. The utility model discloses a three frequency division system, bass are sent by the subwoofer, and the well sound is sent by the well sound speaker and the high pitch loudspeaker of the multichannel speaker that only send well sound and high pitch by, realizes the electro-acoustic reduction of high-fidelity, and tone quality is better.

4. The utility model discloses a passive speaker symmetry sets up, forms multiple bass reinforcing. The utility model discloses well audio amplifier bass effect is more showing and change in the installation in the car and put than traditional art 8 "two voice coil loudspeaker voice coil 15 liter car subwoofers or 6 liter traditional ultra-thin subwoofer effects.

5. The utility model discloses the power amplifier of audio signal processing board is small, can directly tie up and tie up on the back tail wire of former car machine, changes in the installation use in the car.

6. The utility model discloses a thereby the door plant vibration has been eliminated to the intermediate frequency divider, the speaker only sends out the mediant and does not send out the bass, has eliminated the noise that the door vibration produced, and make full use of the audio power output of former car machine, has reduced distortion and the consumption that general back dress DSP repeated secondary power amplifier brought.

7. The utility model discloses an audio signal handles and is provided with subwoofer volume adjuster on the board, through adjusting this subwoofer volume adjuster, can reach the equilibrium of bass, middle pitch and high pitch, is that the audio is better.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the structure of the audio signal processing board of the present invention;

FIG. 3a is a partial cross-sectional view of a top view of the subwoofer of the present invention;

FIG. 3b is a front view of the subwoofer of the present invention;

fig. 4 is a schematic structural view of the built-in subwoofer power amplifier subwoofer of the utility model;

the system comprises an original car machine 1, an original car machine socket 2, a rear-loading wiring harness 3, a new car machine plug 4, a rear-loading input line 5, an audio signal processing board 6, a rear-loading output line 7, a new output socket 8, an original car wiring harness plug 9, an original car wiring harness 10, a subwoofer output cable 11, a subwoofer 12, a medium-frequency divider 13, a subwoofer frequency divider 14, a subwoofer power amplifier 15, a subwoofer box 16, an active subwoofer 17, a passive subwoofer 18 and a sound channel loudspeaker 19, wherein the original car machine is a single-mode vehicle, the original car machine socket 2 is a single-mode vehicle socket, the rear-loading wiring harness 3 is a single-mode vehicle plug, the original car wiring harness 10 is a single-mode vehicle wiring harness, the subwoofer output cable 11 is a subwoofer frequency divider 12, the subwoofer power amplifier 13 is a medium-frequency divider, the subwoofer frequency divider 14, the subwoofer power amplifier 15, the subwoofer box 16 is a subwoofer box 17, the active subwoofer 18 is a passive subwoofer, and the sound channel loudspeaker 19 is a sound channel loudspeaker; 20 is a rear-mount through line, 21 is a three-way power line, 22 is a rear-mount socket, 23 is a rear-mount plug, and 24 is a subwoofer volume adjuster.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The utility model discloses a back dress sound system of car, including installing former car machine 1 and former car machine socket 2, back dress pencil 3, audio signal processing board 6, former car pencil plug 9, former car pencil 10, subwoofer output cable 11, subwoofer 12, sound channel speaker 19 in the car respectively, back dress pencil 3 is by new car machine plug 4, back dress input line 5, back dress output line 7, new output socket 8, the direct line 20 of back dress, three way power cord 21 and back dress plug 23 constitution. The subwoofer 12 comprises a subwoofer box 16, an active subwoofer 17 and a passive subwoofer 18, wherein the subwoofer box 16 is a closed box, and the passive subwoofer 18 is correspondingly arranged in pairs. In an automobile, the number of the subwoofers 12 can be 1, or 2 or more;

as shown in fig. 1, which is a schematic structural diagram of the present invention, an original car machine 1 is provided with an original car machine socket 2, and the original car machine socket 2 is connected to an audio signal processing board 6 through a rear-loading harness 3;

the sound channel loudspeakers 19 are multiple, the sound channel loudspeakers 19 are connected with one end of an original vehicle wiring harness 10, the other end of the original vehicle wiring harness 10 is connected with an original vehicle wiring harness plug 9, and the sound channel loudspeakers 19 are connected with the audio signal processing board 6 through a rear-mounted wiring harness 3;

as shown in fig. 3a to 4, the subwoofer 12 includes: a subwoofer box 16, and an active woofer 17 and a passive woofer 18 arranged in the subwoofer box 16;

the audio signal processing board 6 is connected to the active woofer 17 of the subwoofer 12 through the subwoofer output cable 11.

The new car machine plug 4 is connected with the rear loading plug 23 through a rear loading input line 5, and the rear loading plug 23 is connected with a new output socket 8 through a rear loading output line 7; an original car machine control line of the original car wiring harness plug 9 is connected with a new car machine plug 4 through a new output socket 8 and a rear-loading through line 20;

the positive and negative power supplies of the original car wiring harness plug 9 are respectively connected with the new car machine plug 4 and the rear loading plug 23 through the new output socket 8 and the three-way power line 21 so as to provide power supplies for the original car machine 1 and the audio signal processing board 6.

The three-way power line 21 is respectively connected with the original car machine power input end of the original car machine socket 2, the power input end of the original car wire harness plug 9 and the power input end of the audio signal processing board 6 through the new car machine plug 4, the new output socket 8 and the rear loading plug 23, so that the power supply of the original car machine 1 and the audio signal processing board 3 is realized by the positive and negative power supplies from the original car wire harness 10;

one end of a rear-loading input line 5 is connected with the audio output end of the original car machine socket 2 through a new car machine plug 4, and the other end of the rear-loading input line is connected with the input end of the audio signal processing board 6 through a rear-loading plug 23;

one end of a rear-mounted output line 7 is connected with the sound channel output end of the audio signal processing board 6 through a rear-mounted plug 23, and the other end of the rear-mounted output line is connected with a plurality of sound channel loudspeakers 19 through a new output socket 8 and an original vehicle wiring harness plug 9;

the rear-loading straight line 20 is an original car machine control line, one end of the rear-loading straight line is connected with an original car machine socket 2 through a new car machine plug 4, and the other end of the rear-loading straight line is connected with an original car wire harness 10 through an original car wire harness plug 9 through a new output socket 8, so that straight connection is formed.

As shown in fig. 2, the audio signal processing board 6 includes an if frequency divider 13, a subwoofer frequency divider 14, a subwoofer power amplifier 15, where the if frequency divider 13 is an LC passive frequency divider (which only allows the if and the hf to pass, but not the lf to pass), the subwoofer frequency divider 14 is a low pass filter, and is an active electronic frequency divider, and may be made of a DSP chip, or an analog chip such as an operational amplifier, and the subwoofer signal output after being processed by the subwoofer frequency divider 14 is adjusted by a subwoofer volume adjuster 24 and then input to the subwoofer power amplifier 15, and the subwoofer power amplifier 15 may be a class D power amplifier or a class a/B power amplifier. The subwoofer power output of subwoofer amplifier 15 is transmitted to subwoofer 12 via subwoofer output cable 11;

the audio signal processing board 6 includes: an intermediate frequency divider 13, a subwoofer frequency divider 14, a subwoofer volume adjustment 24, and a subwoofer amplifier 15;

the input end of the intermediate frequency divider 13 is connected with the input end of the audio signal processing board 6, and the output end thereof is connected with the output end of the audio signal processing board 6;

the positive and negative power supplies connected with the original vehicle wiring harness plug 9 are connected in parallel with the frequency divider through the power supply end of the audio signal processing board 6;

the subwoofer frequency divider 14 is a low pass filter, the input of which is the audio signal of each sound channel output by the original car machine 1, the bass output of the subwoofer frequency divider 14 is adjusted by the bass volume adjuster 14 and then input to the subwoofer power amplifier 15, and the power output by the subwoofer power amplifier 15 is transmitted to the subwoofer 12 through the subwoofer output cable 11.

A plurality of intermediate frequency dividers 13 are all high-pass filters; the number of the center frequency dividers 13 is the sum of the number of the channels of all the channel speakers 19, so that each center frequency divider 13 is connected to its corresponding one of the channel speakers 19.

Each of the midrange dividers 13 is 1 capacitor, which is a non-polar capacitor, and each of the capacitors is connected in series with the voice coil of the corresponding channel speaker 19 to form an LC passive divider.

The active bass loudspeaker 17 is embedded into the bass box 16 and the installation plane of the active bass loudspeaker is positioned on the plane of a certain side wall of the box; the active woofer 17 is connected with the subwoofer amplifier 15 of the audio signal processing board 6 through the subwoofer output cable 11;

the passive woofers 18 are arranged in pairs, each pair of passive woofers 18 being arranged in the subwoofer cabinet 16 in correspondence with each other.

Subwoofer power amplifier 15 sets up in subwoofer box 16, or subwoofer power amplifier 15, subwoofer frequency divider 14 and subwoofer volume adjustment ware 24 all set up in subwoofer box 16.

The audio signal processing board 6 is disposed in a box body, and the box body is fixed to the rear-loading harness 3 or the original car machine 1.

The original car machine 1 is a car radio and player already installed in the original car, and is also called a car multimedia player. The original car wire harness plug 9 and the original car wire harness 10 are the car wire harness plug and the car wire harness of the original car, the sound channel speaker 19 is each sound channel car speaker of the original car, generally 4 sound channels of front left, front right, back left and back right, these speakers are the original car speakers generally, also can be the speakers after the back loading upgrade, for example: the 4 low 2 high loudspeaker systems of former car, about 6 cun mid bass loudspeaker set up 4 doors respectively about 4, 2 high pitch loudspeaker set up in the front left, front right door upper portion or left, right A post or front instrument desk left and right both ends. Of course, a new speaker may be replaced. The middle-high power output after the frequency division by the intermediate frequency divider 13 of the audio signal processing board 6 respectively drives the loudspeakers corresponding to the front left channel, the front right channel, the rear left channel and the rear right channel through the original car wiring harness plug 9 and the original car wiring harness 10;

example (b):

as shown in fig. 1, the vehicle rear-mounted sound system of the present embodiment can be completed by the vehicle owner himself or herself DIY, that is, first, the original vehicle 1 is detached, the original harness plug 9 is pulled out from the original vehicle socket 2, the new vehicle plug 4 of the rear harness 3 is inserted into the original vehicle socket 2, the rear plug 23 of the rear harness 3 is inserted into the rear socket 22 of the audio signal processing board 6, the original harness plug 9 is inserted into the new output socket 8, and finally, the subwoofer 12 is connected by the subwoofer output cable 11, and the entire rear mounting is completed.

The rear-loading wire harness 3 is manufactured by a general cold-pressing automobile wire harness manufacturing method, the new vehicle plug 4 and the new output socket 8 are a pair of matched automobile tail connectors, and the pair of connectors are correspondingly changed according to the vehicle types of different vehicles factories so as to be suitable for different vehicles factories and different vehicle types in the world, such as popular vehicle types, Toyota vehicle types, Honda vehicle types, Jili vehicle types and other different vehicle types. The aftermarket plug 23 and the aftermarket socket 22 are a set of corresponding connector male and female plug receptacles.

The lines of the rear loading harness 3 include four sets of lines, the first set is a rear loading input line 5 from the new car machine plug 4 to the rear loading plug 23, the line is 4 channels of the original car machine with 8 lines, namely FL +, FL-, FR +, FR-, RL +, RL-, RR +, RR-high level power output line, the four sets of lines are simultaneously input lines of the audio signal processing board 6; the second group is a rear-mounted output line 7 from a rear-mounted plug 23 to the audio signal processing board 6 of the new output socket 8, the line is also a corresponding 4-channel 8 line, namely, a new FL +, FL-, FR +, FR-, RL +, RL-, RR +, RR-new four-channel output by the audio signal processing board 6 after being subjected to frequency division by the intermediate frequency divider 13, and the 4-channel line is connected with corresponding front left, front right, rear left and rear right corresponding channel speakers 19 through the rear-mounted output line 7, the original vehicle wiring harness plug 9 and the original vehicle wiring harness 10; the third group is a three-way power line 21, the three-way power line 21 is a +12V line and a ground line 2 line, namely, a 12V-14.4V direct current power supply of the automobile from the original automobile wiring harness plug 9 is connected with a ground tee in parallel, the power supply is connected to the original automobile machine 1 through a new automobile machine plug 4, and a rear-loading plug 23 is connected to the audio signal processing board 6 so as to supply power to the original automobile machine 1 and the audio signal board 6; the fourth group is a rear loading through line 20, and the rear loading through line 20 is used for the remaining control signal lines from the original car wiring harness 10, and is all directly connected to the original car machine 1 to ensure the normal operation of the original car machine 1.

The length of cable from the new car machine plug 4 to the new outlet socket 8 and the length of cable from the new outlet socket 8 to the rear loading plug 23 may be determined according to the installation location. Both lengths of this embodiment are 0.2 meters. The audio signal processing board 6 is provided with a subwoofer volume adjuster 24, and the subwoofer volume adjuster 24 is adjusted to realize the balance of bass, middle and high tones and realize high-quality electroacoustic reduction, wherein the subwoofer volume adjuster 24 can be controlled by electronic software or a physical potentiometer, and the embodiment is an electronic software mode. The number of subwoofers 12 may be 1, or 2 or more.

As shown in fig. 2, the audio signal processing board 6 of the present embodiment is a PCB board, and the if divider 13, the subwoofer divider 14, the subwoofer volume adjuster 24, and the subwoofer power amplifier 15 are provided on the PCB board. The intermediate frequency divider 13 is an LC passive frequency divider, which is an LC frequency divider formed by connecting 4 non-polar capacitors in series with each audio power output from the original car machine 1, and the capacitors and the corresponding voice coil inductances L of the front left, right, rear left, and right channel speakers 19 form an LC frequency divider, i.e., a high pass filter, i.e., a middle and high pass filter, and low tones are blocked. The capacitor is a non-polar capacitor with a capacity of 40-200 microfarads, and the capacitor of the present embodiment uses 100 muF, so that the low frequency of 120Hz or so, i.e. below 120Hz, cannot pass through, the middle and high frequency of 120Hz or so, and is transmitted to the middle and high tone speakers corresponding to the 4 channel speakers 19 through the rear-mounted output line 7 and the original vehicle wiring harness 10. The original factory design of the original vehicle is that the bass and the bass of the original vehicle are both completed by 6 inches of medium and bass loudspeakers with 4 vehicle doors, and the double tasks of completing the bass electro-acoustic conversion and the midrange electro-acoustic conversion of the original vehicle are changed into the specific task of completing the midrange electro-acoustic conversion, so that the voice coil displacement of the loudspeaker is realized, the distortion degree of the electro-acoustic conversion is greatly reduced by more than 90%, the midrange is clearer, and the reduction degree is more perfect. On the basis of the high pitch, an original LC high pitch passive frequency divider is arranged on a high pitch loudspeaker, namely, 1 high pitch frequency-dividing capacitor is connected in series with the high pitch loudspeaker of each sound channel, the high pitch frequency-dividing capacitor is generally 1 mu F-4.7 mu F and is connected in series in a high pitch loudspeaker circuit, the frequency-dividing frequency is about 4.5KHz, namely, high pitch signals from about 4.5KHz to 20KHz pass through, and the high pitch loudspeaker is driven. In the audio signal processing board 6, a subwoofer frequency divider 14 is disposed, and this subwoofer frequency divider 14 is an electronic active frequency divider, and may adopt a DSP chip, or may also be formed by an analog chip such as an operational amplifier, and the DSP chip is adopted in this embodiment. The chip has DSP audio digital signal processing and EQ tuning functions, 4 paths of high-level audio signals output to an audio signal processing board 6 by an original car machine 1 are firstly converted from high level to low level and mixed and then input to a subwoofer frequency divider 14, the DSP chip carries out A/D conversion on the analog signals and then carries out DSP bass signal processing and EQ tuning processing, and the chip has three functions, namely, the function of the subwoofer bass frequency divider, which is a bass filter, bass passes through by an electronic active frequency divider, and middle and high tones higher than the frequency of the subwoofer are prevented, and the frequency dividing point of the embodiment is about 120 Hz; the EQ tuning function is used for completing tuning compensation of low frequencies of factory EQs of different vehicle models of different vehicles and factories all over the world; thirdly, bass enhancement processing is carried out on the obtained subwoofer low-frequency signals, so that the subwoofer low-frequency signals are formed and are transmitted to the subwoofer power amplifier 15 after being adjusted by the subwoofer volume adjuster 24, and subwoofer power output by the subwoofer power amplifier 15 is connected to the subwoofer 12 through the subwoofer output cable 11. The DSP processing and the EQ tuning are performed, the original default values of the original car machines 1 of different car factories and car models are different, the best data are obtained through mobile phone Bluetooth or computer software tuning, the data form a software package and are written and stored in a DSP chip, and the embodiment is a mobile phone Bluetooth method. Subwoofer volume adjustment 24 may be an electronic or physical potentiometer. The present embodiment is electronic, that is, the volume adjustment of the subwoofer is implemented by using a software method of a DSP chip, and the present embodiment adopts a DSP chip manner. The subwoofer power amplifier 12 can be a class-D power amplifier or a class-A/B power amplifier. The present embodiment uses a class D power amplifier. The audio signal processing board 6 is mounted in a small box made of metal such as iron, aluminum, or plastic. The volume of the box is very small, which is 15% of the volume of the DSP box in the general technology, and the cost is only 10% of the cost of the DSP product in the general technology. The plastic box is very small, is only 106mm long, 64mm wide and 26mm thick, is very convenient to install in a car, and can be directly bound on the tail wire of a car machine.

As shown in fig. 3a and 3b, the subwoofer 12 of the present embodiment is composed of a subwoofer cabinet 16, an active woofer 17 and a passive woofer 18. The passive woofers 17 are correspondingly arranged in pairs, and the subwoofer box 16 is a closed cavity which can be made of metal materials or plastics. The present embodiment is made of aluminum and plastic. Namely, a part of aluminum and a part of plastic. The volume of the automobile ultra-thin seat is about 2.7 liters, which is only 50 percent of the volume of a subwoofer under the traditional automobile ultra-thin seat. The embodiment has the advantages that the length is 298mm, the width is 199mm, the thickness is 66mm, and the installation in an automobile is easier and convenient. The ratio of the diaphragm area of the active woofer 17 to the diaphragm area of the passive woofer 18 is 1:1.5 to 2.5. this example is 1: 2, the active woofer 17 of this embodiment is a 1-4 inch woofer unit, and the passive woofer 18 is a 2-4 inch passive woofer unit, and is arranged in front-back or up-down symmetry. The manufacturing cost of the subwoofer 12 is only 20% of that of the subwoofer under the ultrathin seat of the automobile in the prior art, but the bass tone quality of the subwoofer is far better than that of the subwoofer under the ultrathin seat of the automobile in the prior art, and the bass effect of the subwoofer is even better than that of the subwoofer of the automobile with the high volume of 8 inches and 15 liters in the traditional technology.

As shown in fig. 4, the subwoofer power amplifier 15 in the present embodiment is provided in the subwoofer box 16 or the subwoofer power amplifier 15, the subwoofer frequency divider 14, and the subwoofer volume adjuster 24 are provided in the subwoofer box 16. When only the subwoofer amplifier 15 is disposed in the subwoofer box 16, the low bass signal after frequency division is output from the audio signal processing board 6 to the subwoofer amplifier 15; when the subwoofer power amplifier 15, the subwoofer frequency divider 14, and the subwoofer volume adjuster 24 are all disposed in the subwoofer box 16, the input signal outputted to the subwoofer frequency divider 14 by the audio signal processing board 6 is a high-level full-band signal outputted from the original car machine 1.

The utility model discloses a theory of operation does:

when the original car machine 1 plays music, the four-channel power output of the original car system is transmitted to the audio signal processing board 6 through the rear-loading wire harness 3, the middle-tone and high-tone sound is separated through the intermediate frequency divider 13 of the audio signal processing board 6, the middle-tone and high-tone sound is respectively driven through the rear-loading wire harness 3 and the original car wire harness 10 to complete the middle-tone electro-acoustic conversion, and the high-tone sound is separated through the high-tone frequency divider to drive the high-tone loudspeaker to realize the high-tone electro-acoustic conversion. Meanwhile, 4-channel power signals input by the audio signal processing board 6 are subjected to high-to-low conversion and mixing and then input to the subwoofer frequency divider 14, subwoofer low-frequency signals obtained after the processing of the subwoofer frequency divider 14 are input to the subwoofer power amplifier 15, and low-frequency power output by the subwoofer power amplifier 15 drives a subwoofer 12 through a subwoofer output cable 11 to complete the bass-to-electric conversion.

The utility model discloses realized three frequency division electro-acoustic conversion in the car, the bass is sent by the subwoofer promptly, and the mediant is sent by former 6 cun speakers in the car, and the high pitch is sent by high pitch loudspeaker, reaches each other's duties, and the respective advantage of performance separately realizes the high-fidelity high pitch quality of car stereo set and restores.

Claims

1. An automobile rear audio system, comprising: the system comprises an original car machine (1), a rear-loading wire harness (3), an audio signal processing board (6), an original car wire harness (10), a subwoofer (12) and a sound channel loudspeaker (19) which are arranged in a car;

the original car machine (1) is provided with an original car machine socket (2), and the original car machine socket (2) is connected with the audio signal processing board (6) through a rear loading harness (3);

the sound channel loudspeakers (19) are multiple, the sound channel loudspeakers (19) are connected with one end of an original vehicle wiring harness (10), the other end of the original vehicle wiring harness (10) is connected with an original vehicle wiring harness plug (9) and is connected with the audio signal processing board (6) through a rear-mounted wiring harness (3);

the subwoofer (12) comprises: a subwoofer box body (16), and an active subwoofer (17) and a passive subwoofer (18) which are arranged in the subwoofer box body (16);

the audio signal processing board (6) is connected with an active woofer (17) of the subwoofer (12) through a subwoofer output cable (11).

2. The automobile rear loading audio system according to claim 1, wherein the rear loading harness (3) includes: a new vehicle machine plug (4), a new output socket (8), a rear loading plug (23), a rear loading input line (5), a rear loading output line (7), a rear loading straight-through line (20) and a three-way power line (21);

the new car machine plug (4) is connected with the rear-loading plug (23) through a rear-loading input line (5), and the rear-loading plug (23) is connected with the new output socket (8) through a rear-loading output line (7); an original vehicle machine control line of the original vehicle wiring harness plug (9) is connected with a new vehicle machine plug (4) through a new output socket (8) and a rear-loading through line (20);

and the positive power supply and the negative power supply of the original vehicle wiring harness plug (9) are respectively connected with the new vehicle machine plug (4) and the rear-mounted plug (23) through a new output socket (8) and a three-way power line (21) so as to provide power for the original vehicle machine (1) and the audio signal processing board (6).

3. The automobile rear-mounted sound system as claimed in claim 2, wherein the three-way power line (21) is connected to the original automobile machine power input end of the original automobile machine socket (2), the power input end of the original automobile wire harness plug (9) and the power input end of the audio signal processing board (6) through the new automobile machine plug (4), the new output socket (8) and the rear-mounted plug (23), respectively, so as to realize that the original automobile machine (1) and the audio signal processing board (6) are powered by positive and negative power from the original automobile wire harness (10);

one end of the rear-loading input line (5) is connected with the audio output end of the original car machine socket (2) through a new car machine plug (4), and the other end of the rear-loading input line is connected with the input end of the audio signal processing board (6) through a rear-loading plug (23);

one end of the rear-mounted output line (7) is connected with the sound channel output end of the audio signal processing board (6) through a rear-mounted plug (23), and the other end of the rear-mounted output line is connected with a plurality of sound channel loudspeakers (19) through a new output socket (8) through an original vehicle wiring harness plug (9);

the rear-loading straight line (20) is an original car machine control line, one end of the rear-loading straight line is connected with an original car machine socket (2) through a new car machine plug (4), and the other end of the rear-loading straight line is connected with an original car wiring harness (10) through an original car wiring harness plug (9) through a new output socket (8) to form a straight-through connection.

4. An automobile afterloading sound system according to claim 1, characterized in that said audio signal processing board (6) comprises: an intermediate frequency divider (13), a subwoofer frequency divider (14), a subwoofer volume adjuster (24) and a subwoofer power amplifier (15);

the input end of the intermediate frequency divider (13) is connected with the input end of the audio signal processing board (6), and the output end of the intermediate frequency divider is connected with the output end of the audio signal processing board (6);

the positive and negative power supplies connected with the original vehicle wiring harness plug (9) are connected with the frequency divider in parallel through the power supply end of the audio signal processing board (6);

the subwoofer frequency divider (14) is a low-pass filter, the input of the low-pass filter is audio signals of all sound channels output by the original car machine (1) to the subwoofer frequency divider (14), the bass output of the subwoofer frequency divider (14) is input to the subwoofer power amplifier (15) after being adjusted by the subwoofer volume adjuster (24), and the power output by the subwoofer power amplifier (15) is transmitted to the subwoofer (12) through the subwoofer output cable (11).

5. The automobile afterloading audio system as claimed in claim 4, wherein said intermediate frequency divider (13) is plural in number, and is a high-pass filter; the number of the intermediate frequency dividers (13) is the sum of the number of the channels of all the channel loudspeakers (19), so that each intermediate frequency divider (13) is connected with one channel loudspeaker (19) corresponding to the intermediate frequency divider.

6. An automobile afterloading system according to claim 5, characterized in that each said midrange divider (13) is a 1 capacitor, each said capacitor being connected in series with the voice coil of the corresponding channel loudspeaker (19) to form a LC passive divider.

7. An automobile afterloading sound system according to claim 1, characterized in that said active woofer (17) is embedded in the subwoofer box (16) with its mounting plane in the plane of a side wall of the box; the active woofer (17) is connected with a subwoofer amplifier (15) of the audio signal processing board (6) through a subwoofer output cable (11);

the passive woofers (18) are arranged in pairs, and each pair of passive woofers (18) are correspondingly arranged in the subwoofer box body (16).

8. An automobile afterloading system according to claim 4 or 7, characterized in that said subwoofer amplifier (15) is arranged in a subwoofer box (16), or said subwoofer amplifier (15), subwoofer divider (14) and subwoofer volume adjuster (24) are arranged in a subwoofer box (16).

9. An automobile rear-loading sound system according to claim 1, characterized in that the audio signal processing board (6) is provided in a case fixed to the rear-loading harness (3) or the original automobile loading machine (1).

10. An automobile afterloading sound system according to claim 1, characterized in that the ratio of the diaphragm area of the active woofer (17) to the total diaphragm area of the passive woofers (18) is: 1: 1.5-2.5.