Vehicle interior sound field replay methodTechnical field
The present invention relates to automobile audio technology, be specifically related to a kind of vehicle interior sound field reproducing technology (SR.C Sound field Reappear in Car).
Background technology
Automobile, as modern transportation instrument, plays great function (being called as " mobile family ") at society.In this year, automobile consumer more and more pays close attention to the sense of hearing comfortableness in vehicle.
Existing car audio system, is mainly limited by the interior seat layout of car and interior space less, causes bass to be difficult to send, and the best listens phoneme not on seat, and sound location is poor, and its main cause is as follows:
1, the fixed layout of loud speaker of sound system in existing car is distributed on position left front, right front, left back and right back in car general rule, forms four tunnel speaker systems.The sound field center of speaker system, conventionally be also changeless, it is positioned at car takes the centre in space, and driver's seat in the main driving seat at human body place, front passenger's seat and/or player No.5's driver's seat, back right driver's seat, rear row, all be positioned at not reciprocity position, also it is large to be that impulse response that each loud speaker sends arrives the time difference of each vehicle seat, does not listen on phoneme in the best.
2, Qianmen loud speaker is generally arranged on the position that car door is lower, causes Sound image localization poor.
3,, because interior space is less, the distance of people and loud speaker is too near, does not become point sound source.Normal domestic use hifi, its audition distance is generally over 2 meters; If three frequency division chest, 3 meters is suitable position in addition especially, can think that its sound is that same point sends.And vehicle sound equipment, the high pitch of (or A post) and the distance of people's ear on instrument desk (general 80cm), high pitch loudspeaker and woofer, respectively from different position sounding, do not become point sound source.
4, interior space is smaller, and the sound wave one-period wavelength of 100HZ is 3.4m, and bass is also difficult to play a role at such confined space.
In existing, the manual types that adopt are carried out sound field adjusting more, namely industry said " golden ear ", and normally the stakeholder in audiophile or repacking shop, rule of thumb debugs.But its parameter of different vehicles arranges difference, the debugging scheme of " golden ear " is more subjective, and error is large, and manual adjustment efficiency is low.And the best recalling listens phoneme to only have one, other audition need be arranged voluntarily by consumer.
In existing, also there are some technology of proposition for solving the existing the problems referred to above of vehicle interior sound field, as Chinese invention patent application (application number 201210048530.4, applying date 2012-02-29) provide a kind of sound field adjustable vehicle-mounted loudspeaker system, its surrounding in automobile is installed multiple adjustable speakers and sound field controller, each adjustable speaker is made up of loud speaker and loud speaker adjuster, loud speaker adjuster is made up of tuning stepping motor, this scheme can be heightened the height of stepping motor adjusting loud speaker, can tuning not only motor fall the direction of positive loud speaker, with the particular location according to driving staff, sound field is regulated, make driving staff listen phoneme in recently.But, this scheme is to adopt mechanical sound field solution, and its change and the vehicle-mounted conventional loud speaker of having upgraded need additionally to install hardware device and can realize sound field adjusting in car, not only increase scheme cost, scheme is installed complicated, and has run counter to the development trend of mobile unit miniaturization, simultaneously, mechanical loudspeaker position regulates, error is large, and hardware device easily, along bad, affects sound field regulating effect.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point of the prior art, a kind of vehicle interior sound field replay method is provided, this programme is by testing each road loudspeaker channel to each pulse response time of listening phoneme, to determine the needed delay time of each road loudspeaker channel, listen phoneme will listen phoneme to be adjusted to the best, thereby realized the vehicle interior sound field reproduction of low-cost and high-quality.
Object of the present invention is achieved through the following technical solutions:
Vehicle interior sound field replay method, as follows:
S1 selects to listen phoneme, tests each road loudspeaker channel is listened phoneme pulse response time to this;
S2, according to the required delay time of each its corresponding loudspeaker channel of channel impulse response Time Calculation, carries out time delay by each loudspeaker channel according to required delay time.
In existing automobile audio, due to the restriction of car inner structure, be " emperor listens phoneme " not having in home theater, the best is listened phoneme, listens phoneme by the best that can realize in automobile of the technical program, and the best listens position freely to select.In such scheme, be different from existing mechanical type sound field and reappear scheme, arrive a certain pulse response time of phoneme of listening to determine delay time by test loudspeaker, make the sound arrival that each road loud speaker sends listen the time of phoneme almost identical, realized the best setting of listening phoneme, and, without changing original loud speaker hardware configuration in car, realized by software control, realized the sound field of low-cost and high-quality and reappeared effect, improve Sound image localization sense.
In said method, described in step S1, listen phoneme to may be selected to be any one in driver's seat in main driving seat, front passenger's seat, player No.5's driver's seat, back right driver's seat and/or rear row and take advantage of seat, test out respectively after the required delay time of each road loudspeaker channel, can each take advantage of seat to be set to the best and to listen phoneme, generally only provide the best of main driving seat to listen phoneme setting and scheme than existing, realized the best at full seat and listened phoneme setting.Certainly, also can select as required any one position in car as listening phoneme, to listen phoneme setting to carry out the best.
Preferably listen in phoneme selection scheme based on above-mentioned, described on-vehicle host is provided with the best and listens phoneme handover module, listen phoneme to listen phoneme at different seat or other taken advantage of for switching the best, a certain while listening phoneme when being switched to, sound field reproduction scheme when on-vehicle host control track loud speaker listens phoneme to listen phoneme as the best using this is carried out time delay adjusting, realize the best and listened freely switching of phoneme, met individual requirements.
Described the best is listened phoneme handover module to can be button formula the best and is listened phoneme handover module, also can be to touch click type the best and listen phoneme handover module, in the time being set to touch click type the best and listening phoneme handover module, can realize one-touch quick switching, selection.
In such scheme, described in step S1, select to listen phoneme, test each road loudspeaker channel is listened phoneme pulse response time to this, be specially: listen phoneme to place pick-up at this, simulation people's auditory properties, pick-up is for receiving the impulse response that each road loudspeaker channel is sent; Each road loudspeaker channel is sent separately impulse response; Pick-up receives the impulse response that each road loudspeaker channel is sent, and test loudspeaker passage sends impulse response and is pulse response time to the time of pick-up.
The preferred version of above-mentioned steps S1, Ruo Chenei is provided with 4 tunnel loudspeaker channel, left front, right front, left back and right back loud speaker is also installed, described while listening phoneme to select in main driving seat, front passenger's seat, player No.5's driver's seat or back right driver's seat, selected just listen phoneme and test out No. 4 loud speakers be respectively t1, t2, t3 and t4 to the pulse response time of listening phoneme, if maximum is Tmax in t1, t2, t3 and t 4, if being located on the distance of two loud speakers of transverse horizontal direction is L, establishing the velocity of sound is C;
Described in step S2, calculate the required delay time of its corresponding road loudspeaker channel according to each pulse response time, each passage power amplifier carried out to time delay according to required delay time, be specifically divided into following situation:
If S101 L < is TmaxC, the delay time of 4 tunnel loudspeaker channel is respectively Tmax-t1, Tmax-t2, Tmax-t3 and Tmax-t4;
If S102 L > is TmaxC, the delay time of 4 tunnel loudspeaker channel is respectively L/C-t1, L/C-t2, L/C-t3 and L/C-t4;
If S103 is L=TmaxC, the delay time of 4 tunnel loudspeaker channel calculates by above-mentioned S101 or S102.
Above-mentioned delay time numerical procedure, due in actual internal loudspeaker layout, TmaxC is generally in 2.2m left and right, make No. 4 loud speakers effectively form point sound source, can realize impression between listening of large space at narrow and small interior space, break through the spatial limitation of sound field, improve hearing effect.
The described pick-up of listening phoneme to place is ears pick-up, be respectively used to receive the left and right sound channels impulse response that each road loudspeaker channel is sent, above-mentioned loudspeaker channel is got the mean value of L channel pulse response time and R channel pulse response time to the pulse response time of listening phoneme.
Because sound wave is propagated through multiple reflections in car, there is peak, there is paddy, adopt above-mentioned mean value calculation mode, can improve calculating accuracy, improve delay time accuracy, reduce error.
In above-mentioned time delay scheme, the time delay of described loudspeaker channel, is carried out by vehicle-mounted time delay IC.Due to the function that in vehicle-mounted multimedia equipment, a lot of IC have time delay to arrange, but all do not have reasonably to utilize, delay operation of the present invention adopts vehicle-mounted intrinsic IC to carry out, and the best listens phoneme setting need not increase cost.
In said method, be reduce error rate, described in step S1, carry out each road loudspeaker channel listen to this phoneme pulse response time test before, also need to make environment inside car meet test condition, to reduce the impact of environment inside car on test result accuracy:
A. ambient noise is at least lower than measured signal sound pressure level 12dB, and surrounding environment can not extraordinary noise;
B. vehicle window is closed, and seal is good, and engine and air-conditioning are closed;
C. 15 DEG C-35 DEG C of ambient temperatures, relative temperature 45%-75%, air pressure 86kPa-106kPa.
The position that the suitable ordinary people of the placement location of ears pick-up drives or is sitting in other and takes advantage of ears when upper, two effects that ears pick-up simulation test people ears are heard.Preferably, because each vehicle seat has certain height and width size, for making ears pick-up and people's ears simulating degree higher, make the best listen phoneme more to mate with people's binaural, described ears pick-up is determined placement location according to the position of people's people's ear in the time taking advantage of on seat usual sitting posture.
The present invention has the following advantages and beneficial effect compared to existing technology:
Vehicle interior sound field reproducing technology provided by the present invention, be different from existing mechanical type sound field and reappear scheme, by testing each road loudspeaker channel to each pulse response time of listening phoneme, to determine the needed delay time of each loudspeaker channel, make the audio frequency arrival that each loud speaker sends listen the time of phoneme almost identical, listen phoneme will listen phoneme to be adjusted to the best, and, the test of pulse response time and time delay regulate, realize by software control, realize the sound field of low-cost and high-quality and reappeared effect, improved Sound image localization sense.Meanwhile, the impulse response time delay scheme adopting, has realized and can realize impression between listening of large space at narrow and small interior space, the real spatial limitation of field at the top of one's voice.
Brief description of the drawings
Fig. 1 is stereo schematic diagram;
Fig. 2 is the ultrasonogram of 4 tunnel speaker systems in car;
Fig. 3 is the inventive method overall flow figure;
Fig. 4 be described in embodiment power amplifier without the impulse response test result of time delay;
Fig. 5 is the test result after power amplifier time delay described in embodiment;
Fig. 6 touches click type the best listens the UI design interface figure of phoneme handover module.
Embodiment
Generally speaking, vehicle interior sound field reproducing technology of the present invention, mainly realizes based on Sound image localization principle.As shown in Figure 1, Sound image localization refers to that electroacoustics system can reappear the sound sources such as musical instrument tram before the lights, can in people's brain, form the image to acoustic image height, the degree of depth, width by the acoustic information of mirage phantom left and right acoustic channels.
According to stereo principle: best effect should be to be equilateral triangle between left and right sound source and auditor, is also A=B=C, is at least isosceles triangle.In the time that isosceles triangle angle is different, the sound stage width difference of acoustic image.
Listen phoneme can produce monophony audio-visual effects from loud speaker away from too, from the result that can reduce stereophonic sound image close to too.
As shown in Figure 2, in general automobile, 4 loud speakers are installed, comprise left front, right front, left back and right back, due to the restriction of environment inside car, the same distance of phoneme Dao Si road loud speaker of listening is unequal, and this distance can not be by brief directly measuring with ruler, the present invention determines that to the pulse response time of listening phoneme four tunnel loudspeaker channel are to same distance of listening phoneme by testing 5 tunnel loudspeaker channel, thereby determines needed delay time.
4 tunnel speaker systems are installed in car shown in Fig. 2, left front, right front, left back and right back channel loudspeaker is also installed, described while listening phoneme to select in main driving seat, front passenger's seat, player No.5's driver's seat or back right driver's seat, the present invention is described in further detail in conjunction with the embodiments, but embodiments of the present invention are not limited to this.
Embodiment
Vehicle interior sound field replay method, before carrying out following method operation, for reducing error rate, need make environment inside car meet environment inside car condition:
A. ambient noise is at least lower than measured signal sound pressure level 12dB, and surrounding environment can not extraordinary noise;
B. vehicle window is closed, and seal is good, and engine and air-conditioning are closed;
C. 15 DEG C-35 DEG C of ambient temperatures, relative temperature 45%-75%, air pressure 86kPa-106kPa.
Meanwhile, the placement location of ears loud speaker next-door neighbour approaches the position of people's people's ear in the time taking advantage of usual sitting posture on seat, and growth is the position when being equivalent to ordinary people and driving, the effect that ears pick-up is heard for simulation test people ears.For example, because people is that the height that the positional distance that described ears pick-up is placed is taken face is 650mm in the face of attending a banquet mobile 3/4 position from front to back in the position of attending a banquet, be 200mm with taking advantage of a horizontal range for headrest;
As shown in Figure 3, method is as follows:
S1 selects to listen phoneme, tests each road loudspeaker channel is listened phoneme pulse response time to this;
S2, according to the required delay time of each its corresponding loudspeaker channel of channel impulse response Time Calculation, carries out time delay by each loudspeaker channel according to required delay time.
Described in step S1, select to listen phoneme, test each road loudspeaker channel is listened phoneme pulse response time to this, be specially: listen phoneme to place ears pick-up at this, be respectively used to receive the left and right sound channels impulse response that channel loudspeaker sends, send separately impulse response by main frame by loudspeaker channel; Ears pick-up receives the impulse response that each road loudspeaker channel is sent, and loudspeaker channel is got the mean value of L channel pulse response time and R channel pulse response time to the pulse response time of listening phoneme, and this mean value is pulse response time.
Ruo Chenei is provided with 4 tunnel loudspeaker channel, front left is also installed, front right, rear left and rear right channel loudspeaker, the described phoneme of listening is at main driving seat, front passenger's seat, while selection in player No.5's driver's seat or back right driver's seat, select to just listen phoneme and test out No. 4 loud speakers and be respectively t1 to the pulse response time of listening phoneme, t2, t3 and t4, if t1, t2, in t3 and t4, maximum is Tmax, if being located on the distance of the two-loudspeaker of transverse horizontal direction is L, (in the time that the distance of front and back two-loudspeaker is not reciprocity, if left front and distance right front speaker transverse horizontal direction is L1, left back and distance right rear loudspeakers transverse horizontal direction is L2, L=(L1+L2)/2), if the velocity of sound is C,
Described in step S2, calculate the required delay time of its corresponding Ge road loudspeaker channel according to each road pulse response time, Jiang Ge road loudspeaker channel is carried out time delay according to required delay time, is specifically divided into following situation:
If S101 L < is TmaxC, the delay time of 4 tunnel loudspeaker channel is respectively Tmax-t1, Tmax-t2, Tmax-t3 and Tmax-t4;
If S102 L > is TmaxC, the delay time of 4 tunnel loudspeaker channel is respectively L/C-t 1, L/C-t2, L/C-t3 and L/C-t4;
If S103 is L=TmaxC, the delay time of 4 tunnel loudspeaker channel calculates by above-mentioned S101 or S102.
With the not H5 model car of Kazakhstan of Great Wall, China motor corporation, car owner's driver's seat is example for listening phoneme below, illustrates test and time-delay method.
Place ears pick-ups (MIC L, MIC R) at main driving seat, the volume of power amplifier is transferred to suitable position to immobilize, test separately respectively front left loudspeaker channel, the right loudspeaker channel in front road, way of escape left speaker passage, rear right wing loudspeaker channel and send out separately the power amplifier of place's sound without the impulse response of time delay, test result as shown in Figure 4.
Through measuring, breathing out not on H5 car, the distance L=1.3m of front left and front right loud speaker, TmaxC=0.0066x340=2.2m, L<TmaxC, for the sound that 4 tunnel loudspeaker channel are sent arrives auditor's ear simultaneously:
Front L channel time delay: 6.6-4.7=1.9ms
Front R channel time delay: 6.6-6.5=0.1ms
Rear L channel time delay: 6.6-5.2=1.4ms
Rear R channel is without time delay.
After time delay arranges, the impulse response result that 4 tunnel loudspeaker channel are tested separately as shown in Figure 5.
Above test result shows: maximum error rate: 0.03/6.6=0.5%, in 10%, substantially reach target, and test error is relevant with ambient noise around, relevant with the reflected sound in automobile, causes reading out data to produce error.
After delay adjustments, suitably finely tune according to sense of hearing, coordinate the adjustment such as EQ, to meet audition needs.
In above-mentioned time delay scheme, the time delay of described each road loudspeaker channel, is carried out by the delay function of vehicle-mounted IC.Due to the function that in vehicle-mounted multimedia equipment, a lot of IC have time delay to arrange, but all do not have reasonably to utilize, delay operation of the present invention adopts vehicle-mounted intrinsic IC to carry out, and the best listens phoneme setting need not increase cost.
Calculate respectively while listening phoneme to listen phoneme as the best by such scheme, after Jiang Ge road loudspeaker channel time delay scheme, on-vehicle host is standby deposits.On-vehicle host is provided with the best and listens phoneme handover module, and when user listens phoneme handover module selected a certain while listening phoneme to listen phoneme as the best by this best, on-vehicle host is by time delay IC execution time delay scheme.
Described the best is listened phoneme handover module to can be button formula the best and is listened phoneme handover module, also can be touch click type the best and listen phoneme handover module, in the time being set to touch click type the best and listening phoneme handover module, be illustrated in figure 6 corresponding UI design interface, can realize one-touch quick switching, selection.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.