CN2395487Y

CN2395487Y - Processing circuit for automobile sound

Info

Publication number: CN2395487Y
Application number: CN 99238983
Authority: CN
Inventors: 林智文
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-14
Filing date: 1999-10-14
Publication date: 2000-09-06
Anticipated expiration: 2009-10-14

Abstract

The utility model relates to a processing circuit for an automobile sound, which comprises a sound field expanding circuit (1), a back surrounding-sound processing circuit (2) and a low-pass filter circuit (3), wherein, through a potentiometer and a select switch, the input ends of a left and a right soundtrack signals L, R of the sound field expanding circuit (1) are connected with the output ends of a left and a right soundtracks of preceding stage sound sources in a carriage, such as a radio tuner, a compact disc player, a card holder, etc. The output ends of a left and a right soundtrack signals L', R' are respectively connected with the input ends of a left and a right front soundtrack-audio power-amplification circuits (4), (5), and the output ends of the L' and the R' are also connected with the input end of the back surrounding-sound processing circuit (2). The output end of a right and left soundtrack composite signal R and L is connected with the input end of the low-pass filter circuit (3) and the input end of a middle soundtrack-audio power-amplification circuit (9), wherein, the output end of the back surrounding-sound processing circuit (2) is connected with the input ends of a back surrounding and soundtrack-audio power-amplification circuits (6), (7), wherein, the output end of the low-pass filter circuit (3) is connected with the input end of a heavy bass power-amplification circuit (8).

Description

The treatment circuit of automobile audio

The utility model is the treatment circuit of automobile audio, belongs to the improvement technology of circuit in the automobile audio.

Sound equipment in the general automobile has several loud speakers, but substantially all be the arrangement of stereo double channel, for example, the preceding right-hand and back right-hand loud speaker is the output that is connected same R channel, ring together before and after promptly so-called, just make at most its sound phase place have some difference to adapt to the environment compartment in, high gear any, just have many supper bass sound channels to play supper bass for subwoofer.

Acoustic image software is used general gradually in automobile, as VCD, DVD laser disc etc., much all can use the Doby coding techniques records, promptly except having recorded the effect of sound move left and right, also the effect that sound is moved forward and backward has been recorded, and uses the automobile audio of existing ordinary skill, be the effect that can't move forward and backward sound, promptly surrounding effect reappears.Some imported auto sound equipment also has uses for example technology of Doby decoding, can reappear surrounding effect, but involve the chip that needs application specific and pay patent fee, so price is all higher.

Acoustic image software in the market is the CD laser disc for example, with stereo more, the laser disc that a plurality of sound channels are recorded with coding techniques, quantity is also gradually many, but common sound field expansion technique, 2 channel loudspeakers are widened sound field about before just utilizing, and for using the software that the Doby coding techniques is recorded, the effect that moves forward and backward is obviously inenough; Then effect is enough dissatisfied and the Doby decoding technique is for the software of playing normal stereo.

The purpose of this utility model is to provide a kind of treatment circuit of automobile audio, has used the automobile audio of this circuit, can expand the sound field of common double sound channel; Also can or be separated into 3～4 road signals and reappear surrounding sound effect, so just can reach the various recording softwares of adaptation, recording effect is given full play to not high cost the common double sound channel through the dual track that dolby pro logic is encoded.The car audio system of being made up of this treatment circuit also can have the sound source of 6 sound channels output supporting with DVD player etc., reappears various surrounding sound effects.

The purpose of this utility model can reach by following technical solution:

A kind of treatment circuit of automobile audio, include sound field expanded circuit (1), back surround sound treatment circuit (2), low-pass filter circuit (3), the left and right sound track signals L of sound field expanded circuit (1) wherein, the R input is the input of treatment circuit, connect the radio tuner in the compartment, CD player, the left and right acoustic channels output of prime sources of sound such as deck, its left and right sound track signals L ', R ' output is the preceding left and right sound track signals output of treatment circuit, and this L ', R ' output also are connected with the input of back surround sound treatment circuit (2), its left and right acoustic channels composite signal R+L output is a center channels signal SC output, also connects the input of low-pass filter circuit (3); Wherein the output of back surround sound treatment circuit (2) is the back surround sound signal SUR of treatment circuit, the SUL output, and wherein the output of low-pass filter circuit (3) is the supper bass signal SB output of treatment circuit.

Sound field expanded circuit (1) includes the follow circuit b1 that operational amplifier constitutes, b2, the subtracter h1 that operational amplifier constitutes, the negative circuit g2 that operational amplifier constitutes, the add circuit g1 that operational amplifier constitutes, g3, g4 and frequency compensation network F1, and doubly-linked potentiometer VRmn, the left and right acoustic channels L of described sound field expanded circuit (1), the R signal input part is the input of follow circuit b2 and b1, b2 output signal L and b1 output signal R; The output of b2 and b1 is connected to the input of subtraction circuit h1 simultaneously, h1 output R-L signal, the output of h1 connects the input of frequency compensation network F1, frequency compensation network F1 output f (R-L) signal, the output of F1 connects the input of negative circuit g2 and the input of g4 by the wherein VRm of company of potentiometer VRmn, this f (R-L) signal becomes mf (R-L) signal through the adjusting of potentiometer VRm, transfer to the input of negative circuit g2 again, negative circuit g2 exports mf (L-R), and the output of negative circuit g2 connects the input of g3; B2, the output of b1 is connected to add circuit g1 input simultaneously, g1 output R+L signal, the g1 output is the left and right acoustic channels composite signal R+L output of described sound field expanded circuit (1), the g1 output connects VRn by other one of potentiometer and connects g4, the input of g3, this R+L signal becomes n (R+L) signal through the adjusting of potentiometer VRn; The b1 output connects the input of g4, so R signal of b1 output, F1 is through mf (R-L) signal of VRm output, be input to the input of g4 simultaneously through n (R+L) signal of VRn output with g1, g4 exports R+mf (R-L)+n (R+L) signal, and therefore the R channel output end signal R ' of described sound field expanded circuit (1) is R+mf (R-L)+n (R+L); In addition, the b2 output connects the input of g3, so L signal of b2 output, mf (L-R) signal of negative circuit g2 output, be input to the input of g3 simultaneously through n (R+L) signal of VRn output with g1, g3 exports L+mf (L-R)+n (R+L) signal, and therefore the L channel output end signal L ' of described sound field expanded circuit (1) is L+mf (L-R)+n (R+L).

Back surround sound treatment circuit (2) includes follow circuit d1 and the d2 that operational amplifier constitutes, the subtracter h2 that operational amplifier constitutes, frequency compensation network F2, F3 and delay circuit Y1, d1 wherein, the input of d2 respectively with sound field expanded circuit (1) in left and right sound track signals L ', R ' output connects, the output of d1, the output of d2 is connected with the input of h2, h2 exports L '-R ' signal, and the input of frequency compensation network F2 is connected with the output of h2, and the output of F2 is connected with the input of delay circuit Y1, the output of Y1 is connected with the input of F3, the output output of F3 is divided into 2 road SUL and SUR again through the L '-R ' signal of frequency compensation and time-delay, is the output end signal of described back surround sound treatment circuit (2).

Low-pass filter circuit (3) is to adopt the following low pass filter of common 100～150Hz to serve as.

The preceding left and right sound track signals L ' of treatment circuit, R ' output connect preceding left and right acoustic channels audio power amplifying circuit (4) respectively, the input of (5), and the output of this power amplification circuit connects the preceding left and right acoustic channels loud speaker SP1 in the compartment, SP2; The back surround sound signal SUL of treatment circuit, surround channel audio power amplifying circuit (6) after the SUR output connects 2, the input of (7), the output of this power amplification circuit connects the surround channel loud speaker SP4 in the compartment, SP5; The supper bass signal SB output of the low-pass filter circuit of treatment circuit (3) connects the input of supper bass power amplification circuit (8), and the output of this power amplification circuit connects the subwoofer SP3 in the compartment; When arranging center channels loud speaker SP6 is arranged in the compartment, the center channels signal SC output of treatment circuit connects the input of center channels audio power amplifying circuit (9), and the output of this power amplification circuit connects the center channels loud speaker SP6 in the compartment.

Wherein the output of F3 is to connect back surround sound signal SUL, SUR output by volume control potentiometer VR2 in the back surround sound treatment circuit (2); The supper bass output signal of low-pass filter circuit (3) is to regulate to form by volume control potentiometer VR3 to be supper bass output signal SB; Left and right acoustic channels composite signal R+L output is to regulate by volume control potentiometer VR4 to become center channels output signal SC.Potentiometer VR2, VR3 and VR4 are respectively applied for and regulate the back surround sound, supper bass and the composition of mid-sound in full sound channel.

Wherein doubly-linked potentiometer VRmn can replace with double-pole switch, double-pole switch the 1st group selection contact connects the output of frequency compensation network F1 and the output of add circuit g1 respectively, double-pole switch the 2nd group selection contact ground connection, the double-pole contact of switch connects g2 respectively, the input of g4 and g3, the input of g4 is to determine not adopt the function of this sound field expanded circuit.

Back surround sound signal SUL, before SUR output and the center channels output signal SC, be serially connected with selector switch respectively, surround sound signal SUL wherein, the SUR output connects (KB2) that double-pole 3 is selected K switch B, (KB1) contact, K switch B the 1st group selection contact (KB2-1) is connected the adjustable side contact of potentiometer VR2 with (KB1-1), K switch B the 2nd group selection contact (KB2-2) and (KB1-2) ground connection, K switch B the 3rd group selection contact (KB2-3) is connected the d2 in the back surround sound treatment circuit (2), the output of d1 with (KB1-3); Center channels signal SC output connects (KC) contact that hilted broadsword 2 is selected K switch C, the 1st adjustable side contact of selecting contact (KC-1) to connect potentiometer VR4 of K switch C, and the 2nd of K switch C selects contact (KC-2) ground connection.After being serially connected with above-mentioned selector switch, can select whether to use the output of back surround sound and the output whether mid-sound is arranged with switch.

The 3rd group selection of K switch B is to make 2 the loud speaker SP4 in back in the present embodiment, SP5 and preceding left and right acoustic channels loud speaker SP1, and SP2 plays the sound of 2 sound channels simultaneously.

Between the input of the output of treatment circuit and the audio power amplifying circuit that is connected, be serially connected with the two change over switch KD that select of 6 cuttves, making the input of each channel audio power amplification circuit can be at the output of this treatment circuit and the decoding output of other modes, for example be to select to connect between 6 sound channels outputs of Doby AC-3 mode.When not having other 6 sound channel outputs, can not arrange this group change over switch.

Described volume control potentiometer VR2, VR3, VR4, selector switch KB, KC, KD and treatment circuit are with being in the casing of automobile audio control panel.

Description of drawings is as follows

The treatment circuit theory diagram of Fig. 1 the utility model automobile audio.

The treatment circuit schematic diagram of Fig. 2 the utility model automobile audio.

Each sound channel of treatment circuit of Fig. 3 the utility model automobile audio is exported pairing loud speaker position in automobile bodies

The vertical view of putting

Each sound channel of treatment circuit of Fig. 4 the utility model automobile audio is exported pairing loud speaker position in automobile bodies

The end view of putting

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is a theory diagram: include sound field expanded circuit (1), back surround sound treatment circuit (2), low-pass filter circuit (3), the left and right sound track signals L of sound field expanded circuit (1) wherein, the R input is the input of treatment circuit, be connected radio tuner in the compartment with selector switch KA by total volume control potentiometer VR1, CD player, the left and right acoustic channels output of prime sources of sound such as deck, its left and right sound track signals L ', R ' output is the preceding left and right sound track signals output of treatment circuit, left and right acoustic channels audio power amplifying circuit (4) before connecting respectively, (5) input, this L ', R ' output also are connected with the input of back surround sound treatment circuit (2), and its left and right acoustic channels composite signal R+L output is a center channels signal SC output, the input that connects center channels audio power amplifying circuit (9) also connects the input of low-pass filter circuit (3); Wherein the output of back surround sound treatment circuit (2) is the back surround sound signal SUR of treatment circuit, and the SUL output connects back surround channel audio power amplifying circuit (6), the input of (7); Wherein the output of low-pass filter circuit (3) is the supper bass signal SB output of treatment circuit, connects the input of supper bass power amplification circuit (8).

As above narrate, the output of treatment circuit is connected to the input of 6 channel audio power amplification circuits, promote the corresponding channel loudspeaker in the compartment, preceding left and right acoustic channels audio power amplifying circuit (4), (5) output connects the preceding left and right acoustic channels loud speaker SP1 in the compartment, SP2 can obtain the effect of approximate 3 Wei Huanraolitishengchang; Surround channel audio power amplifying circuit (6) after 2, the output of (7) connects the surround channel loud speaker SP4 in the compartment, and SP5 makes and listens the hearer and obviously feel and surrounded by sound field; The output of supper bass power amplification circuit (8) connects the subwoofer SP3 in the compartment, and its effect is to strengthen bass effect; When arranging center channels loud speaker SP6 is arranged in the compartment, the output of center channels audio power amplifying circuit (9) connects the center channels loud speaker SP6 in the compartment.Because vehicle interior space is little, and the mid-sound of this treatment circuit can influence the location about sound field when excessive, and center channels loud speaker SP6 generally can be transferred to minimum to volume, perhaps need not.When not adopting center channels loud speaker SP6, the output of treatment circuit is connected to the input of 5 channel audio power amplification circuits.

Fig. 2 is the main line schematic diagram: wherein sound field expanded circuit (1) includes the follow circuit b1 that operational amplifier constitutes, b2, the subtracter h1 that operational amplifier constitutes, the negative circuit g2 that operational amplifier constitutes, the add circuit g1 that operational amplifier constitutes, g3, g4 and frequency compensation network F1, and doubly-linked potentiometer VRmn, the left and right acoustic channels L of described sound field expanded circuit (1), the R signal input part is the input of follow circuit b2 and b1, b2 output signal L and b1 output signal R; The output of b2 and b1 is connected to the input of subtraction circuit h1 simultaneously, h1 output R-L signal, the output of h1 connects the input of frequency compensation network F1, frequency compensation network F1 output f (R-L) signal, the output of F1 connects the input of negative circuit g2 and the input of g4 by the wherein VRm of company of potentiometer VRmn, this f (R-L) signal becomes mf (R-L) signal through the adjusting of potentiometer VRm, transfer to the input of negative circuit g2 again, negative circuit g2 exports mf (L-R), and the output of negative circuit g2 connects the input of g3; B2, the output of b1 is connected to add circuit g1 input simultaneously, g1 output R+L signal, the g1 output is the left and right acoustic channels composite signal R+L output of described sound field expanded circuit (1), the g1 output connects VRn by other one of potentiometer and connects g4, the input of g3, this R+L signal becomes n (R+L) signal through the adjusting of potentiometer VRn; The b1 output connects the input of g4, so R signal of b1 output, F1 is through mf (R-L) signal of VRm output, be input to the input of g4 simultaneously through n (R+L) signal of VRn output with g1, g4 exports R+mf (R-L)+n (R+L) signal, and therefore the R channel output end signal R ' of described sound field expanded circuit (1) is R+mf (R-L)+n (R+L); In addition, the b2 output connects the input of g3, so L signal of b2 output, mf (L-R) signal of negative circuit g2 output, be input to the input of g3 simultaneously through n (R+L) signal of VRn output with g1, g3 exports L+mf (L-R)+n (R+L) signal, and therefore the L channel output end signal L ' of described sound field expanded circuit (1) is L+mf (L-R)+n (R+L).After evidence R and L add f (R-L) and f (L-R) respectively, make the people feel that the position of left and right sides loud speaker widened, but have only f (R-L) and f (L-R), sound is the sensation of wafing, add n (R+L) again after, the expansion of sound field is just steady and sure.

Can see from circuit, m and n change between 0-1, during actual the use, VRm and VRn adjusted in concert change the separating degree that can make left and right acoustic channels and keep maximum, for example R+mf (R-L) in the R channel+n (R+L)=(1+mf+n) R+ (n-mf) L, left channel signals part (n-mf) L=(n-m+m-mf) L=(n-m) L+m (1-f) L wherein, when m=n, (n-m) L=0, just, the pure L that is mixed in the R channel partly equals zero, and facts have proved it also is like this.So adopt doubly-linked potentiometer VRmn, make its synchronous variation.

Wherein back surround sound treatment circuit (2) includes follow circuit d1 and the d2 that operational amplifier constitutes, the subtracter h2 that operational amplifier constitutes, frequency compensation network F2, F3 and delay circuit Y1, d1 wherein, the input of d2 respectively with sound field expanded circuit (1) in left and right sound track signals L ', R ' output connects, the output of d1, the output of d2 is connected with the input of h2, h2 exports L '-R ' signal, and the input of frequency compensation network F2 is connected with the output of h2, and the output of F2 is connected with the input of delay circuit Y1, the output of Y1 is connected with the input of F3, the output output of F3 is divided into 2 road SUL and SUR again through time-delay 20～50ms and the following L '-R ' signal of frequency 7KHz, is the output end signal of described back surround sound treatment circuit (2).The general sound of singing and talking in the middle of all being, promptly the composition in L and R equates, the composition that has not just had these middle voices behind the L-R, because L '-R '=[L+mf (L-R)+n (R+L)]-[R+mf (R-L)+n (R+L)]=(1+2mf) (L-R), remaining musical instrument sound and the ambient sound that distributes,, make and listen the hearer and feel that the sound of sea wave in the music directly gets to after one's death again from back broadcast through time-delay and frequency compensation.

Low-pass filter circuit in the technical program (3) is to adopt the following active low-pass filter of common 100～150Hz to serve as, circuit (3) includes operational amplifier a1, a2 and peripheral resistance R 1-R13, capacitor C 1-C9, wherein an end of resistance R 1 is the input of this low-pass filter circuit (3), be connected with the output of g1 in the sound field expanded circuit (1), the other end of R1 is connected with the input of a1 by capacitor C 1, the output of a1 is by capacitor C 3, low-pass network is connected with the input of a2, and the output of a2 is the output of low-pass filter circuit (3).

Among this Fig. 2, the output of back surround sound treatment circuit (2), between the input of the output of low-pass filter circuit (3) and the output of center channels signal and the audio power amplifying circuit that is connected respectively, be serially connected with volume control potentiometer, be used to regulate the back surround sound, supper bass and the composition of mid-sound in full sound channel.Wherein the output of F3 is to connect back surround sound signal SUL, SUR output by volume control potentiometer VR2 in the back surround sound treatment circuit (2); The supper bass output signal of low-pass filter circuit (3) is to regulate to form by volume control potentiometer VR3 to be supper bass output signal SB; Left and right acoustic channels composite signal R+L output is to regulate by volume control potentiometer VR4 to become center channels output signal SC.

Wherein doubly-linked potentiometer VRmn can replace with double-pole switch, double-pole switch the 1st group selection contact connects the output of frequency compensation network F1 and the output of add circuit g1 respectively, double-pole switch the 2nd group selection contact ground connection, the double-pole contact of switch connects g2 respectively, the input of g4 and g3, the input of g4.When switch pushes the 2nd group selection contact ground connection, when being equivalent to the m=n=0 retaining, R '=R and L '=L, it promptly is the function that does not adopt this sound field expanded circuit, when switch pushes the 1st group selection contact, being equivalent to m=n=1 when retaining, being equivalent to VRm and VRn is transferred to maximum, promptly is the function that has adopted this sound field expanded circuit.

Back surround sound signal SUL, before SUR output and the center channels output signal SC, be serially connected with selector switch respectively, surround sound signal SUL wherein, the SUR output connects (KB2) that double-pole 3 is selected K switch B, (KB1) contact, K switch B the 1st group selection contact (KB2-1) is connected the adjustable side contact of potentiometer VR2 with (KB1-1), K switch B the 2nd group selection contact (KB2-2) and (KB1-2) ground connection, K switch B the 3rd group selection contact (KB2-3) is connected the d2 in the back surround sound treatment circuit (2), the output of d1 with (KB1-3); Center channels signal SC output connects (KC) contact that hilted broadsword 2 is selected K switch C, the 1st adjustable side contact of selecting contact (KC-1) to connect potentiometer VR4 of K switch C, and the 2nd of K switch C selects contact (KC-2) ground connection.

After being serially connected with selector switch, potentiometer VR2, VR4 adopt the disposable half adjustable form of adjusting in back is installed, and are selected whether to use the output of back surround sound respectively by above-mentioned selector switch, and the output whether mid-sound is arranged.

In the present embodiment, K switch B the 1st, 2 group selection contacts select whether to have the output of back surround sound, also have the 3rd group selection be L ' and R ' signal through amplifying, lead directly to 2 the loud speaker SP4 in back, SP5, loud speaker SP4, SP5 and preceding left and right acoustic channels loud speaker SP1, SP2 plays the sound of 2 sound channels simultaneously, by the VRmn in the sound field expanded circuit (1) or to decide the effect of playing the sound field expansion with double-pole switch still be the normal stereo effect.

See Fig. 1 again, between the input of the output of treatment circuit and the audio power amplifying circuit that is connected, be serially connected with the two change over switch KD that select of 6 cuttves, make the input of each channel audio power amplification circuit between the decoding output of the output of this treatment circuit and other modes, select to connect, for example in the automobile audio DVD player is installed, and 6 sound channel outputs of Doby AC-3 mode are arranged

When the prime source of sound is connected to 6 sound channels outputs that other modes decode, present embodiment is to arrange like this, in the middle of audio power amplifying circuit (4)～(9), preceding left and right acoustic channels audio power amplifying circuit (4), (5) input connects two (KD1) and (KD2) that select in the change over switch of 6 cuttves respectively, (KD1) be connected the left and right sound track signals L ' of sound field expanded circuit (1) with (KD2-1) with the first group selection contact (KD1-1) of (KD2), R ' output, the second group selection contact (KD1-2) is exported JL, JR with the preceding left and right acoustic channels that (KD2-2) is connected respectively in the output of 6 sound channels.Back surround channel audio power amplifying circuit (6), (7) input connects two (KD4) and (KD5) that select in the change over switch of 6 cuttves respectively, (KD4) be connected the signal SUL of surround sound treatment circuit (2) afterwards with (KD5-1) with the first group selection contact (KD4-1) of (KD5), the SUR output, the second group selection contact (KD4-2) is exported SL with the surround channel signal that (KD5-2) is connected respectively in the output of 6 sound channels, SR, the input of supper bass audio power amplifying circuit (8) connects two (KD3) that select in the change over switch of 6 cuttves, (KD3) first selects contact (KD3-1) to connect the signal SB output of low-pass filter circuit (3), selects contact (KD3-2) to connect 6 supper bass sound channel signal output JS in the sound channel output for second.The input of center channels audio power amplifying circuit (9) connects two (KD6) that select in the change over switch of 6 cuttves, (KD6) first selects contact (KD6-1) to connect the center channels SC signal output part of sound field expanded circuit (1), selects the center channels signal output JC in the output of contact (KD6-2) connection 6 sound channels for second.When not having other 6 sound channel outputs, the second group selection contact of this change over switch can not use, and does not perhaps arrange this group change over switch.

Described volume control potentiometer VR2, VR3, VR4, selector switch KB, KC, KD and treatment circuit are with being in the casing of automobile audio control panel, so that select and adjusting; These parts can be assembled into one independently " processor of automobile audio " automobile audio miscellaneous part on product and the market is supporting.

Fig. 3 is the vertical view of loud speaker position in automobile bodies among the embodiment, the direction in the position display compartment of steering wheel 14.The output of each the channel audio power amplification circuit in the circuit can connect more than one loud speaker, especially preceding left and right acoustic channels audio power amplifying circuit (4), (5).Preceding left channel loudspeaker SP1, the left front of SP1 ' first line left seat 11 in automobile bodies, preceding right channel loudspeaker SP2, SP2 ' is in the right front of right seat 12.Preceding left channel loudspeaker SP1 " left front of rear stall position 13 in automobile bodies, preceding right channel loudspeaker SP2 " right front in rear stall position 13.Preceding L channel has SP1, SP1 ' and SP1 ", preceding R channel has SP2, SP2 ' and SP2 ".The power of loudspeaker that each sound channel also can have 2～3 road audio amplifier circuits to bear respectively separately amplifies.In the middle of the rear of subwoofer SP3 rear stall position 13 in automobile bodies, center channels loud speaker SP6 generally is to be located in the middle of the place ahead of rear stall position 13 with television indicator screen 10.The effect of center channels loud speaker SP6 is that the dialogue in the film is positioned at screen place, when not installing television indicator screen 10 in the compartment, does not need to arrange the audio power amplifying circuit (9) and the loud speaker SP6 of center channels.

Represent that as Fig. 4 the surround channel loud speaker SP4 in the compartment 15, SP5 should be arranged in back row passenger's ear rear, and it is better to be higher than ear, as positions such as SP4 ' among the figure.

The utility model is the input of treatment circuit when using, be connected radio tuner by potentiometer VR1 with selector switch KA, CD player, the left and right acoustic channels output of prime sources of sound such as deck, the input of each channel audio power amplification circuit is the output of connection processing circuit respectively, and signal is play through transporting to corresponding loud speaker SP1～SP6 after amplifying.During adjusting, potentiometer VRm and VRn accent are pushed the function that adopts this sound field expanded circuit (1) in maximum or switch, it is below half of preceding left and right acoustic channels volume that back surround channel volume is transferred to, the center channels of this treatment circuit is in the film dialogue sound of indivedual softwares usefulness hour, at ordinary times, when especially playing common stereo music, do not need to use, supper bass can be liked regulating according to the individual, at this moment can well be simulated surrounding stereophonic field effect.

With the treatment circuit of the utility model automobile audio, can connect the output of various dual track sources of sound, with low cost by the drive-in cinema that this treatment circuit is formed, popularize popular easily.

Claims

1. the treatment circuit of an automobile audio, it is characterized in that including sound field expanded circuit (1), back surround sound treatment circuit (2), low-pass filter circuit (3), the left and right sound track signals L of sound field expanded circuit (1) wherein, the R input is the input of treatment circuit, connect the left and right acoustic channels output of the prime sources of sound such as radio tuner in the compartment, its left and right sound track signals L ', R ' output is the preceding left and right sound track signals output of treatment circuit, this L ', R ' output also is connected with the input of back surround sound treatment circuit (2), its left and right acoustic channels composite signal R+L output is a center channels signal SC output, also connects the input of low-pass filter circuit (3); Wherein the output of back surround sound treatment circuit (2) is the back surround sound signal SUR of treatment circuit, the SUL output, and wherein the output of low-pass filter circuit (3) is the supper bass signal SB output of treatment circuit.

2. the treatment circuit of automobile audio according to claim 1, it is characterized in that sound field expanded circuit (1) includes the follow circuit b1 that operational amplifier constitutes, b2, the subtracter h1 that operational amplifier constitutes, the negative circuit g2 that operational amplifier constitutes, the add circuit g1 that operational amplifier constitutes, g3, g4 and frequency compensation network F1, and doubly-linked potentiometer VRmn, the left and right acoustic channels L of described sound field expanded circuit (1), R signal input part are the inputs of follow circuit b2 and b1, b2 output signal L and b1 output signal R; The output of b2 and b1 is connected to the input of subtraction circuit h1 simultaneously, h1 output R-L signal, the output of h1 connects the input of frequency compensation network F1, frequency compensation network F1 output f (R-L) signal, the output of F1 connects the input of negative circuit g2 and the input of g4 by the wherein VRm of company of potentiometer VRmn, this f (R-L) signal becomes mf (R-L) signal through the adjusting of potentiometer VRm, transfer to the input of negative circuit g2 again, negative circuit g2 exports mf (L-R), and the output of negative circuit g2 connects the input of g3; B2, the output of b1 is connected to add circuit g1 input simultaneously, g1 output R+L signal, the g1 output is the left and right acoustic channels composite signal R+L output of described sound field expanded circuit (1), the g1 output connects VRn by other one of potentiometer and connects g4, the input of g3, this R+L signal becomes n (R+L) signal through the adjusting of potentiometer VRn; The b1 output connects the input of g4, so R signal of b1 output, F1 is through mf (R-L) signal of VRm output, be input to the input of g4 simultaneously through n (R+L) signal of VRn output with g1, g4 exports R+mf (R-L)+n (R+L) signal, and therefore the R channel output end signal R ' of described sound field expanded circuit (1) is R+mf (R-L)+n (R+L); In addition, the b2 output connects the input of g3, so L signal of b2 output, mf (L-R) signal of negative circuit g2 output, be input to the input of g3 simultaneously through n (R+L) signal of VRn output with g1, g3 exports L+mf (L-R)+n (R+L) signal, and therefore the L channel output end signal L ' of described sound field expanded circuit (1) is L+mf (L-R)+n (R+L).

3. the treatment circuit of automobile audio according to claim 2, it is characterized in that back surround sound treatment circuit (2) includes follow circuit d1 and d2 that operational amplifier constitutes, the subtracter h2 that operational amplifier constitutes, frequency compensation network F2, F3 and delay circuit Y1, d1 wherein, the input of d2 respectively with sound field expanded circuit (1) in left and right sound track signals L ', R ' output connects, the output of d1, the output of d2 is connected with the input of h2, h2 exports L '-R ' signal, the input of frequency compensation network F2 is connected with the output of h2, the output of F2 is connected with the input of delay circuit Y1, and the output of Y1 is connected with the input of F3, and the output output of F3 is through the L '-R ' signal of frequency compensation and time-delay, be divided into 2 road SUL and SUR again, be the output end signal of described back surround sound treatment circuit (2).

4. the treatment circuit of automobile audio according to claim 1 is characterized in that low-pass filter circuit (3) is to adopt the following low pass filter of common 150Hz to serve as.

5. the treatment circuit of automobile audio according to claim 1, the preceding left and right sound track signals L ' that it is characterized in that treatment circuit, R ' output connects preceding left and right acoustic channels audio power amplifying circuit (4) respectively, (5) input, the output of this power amplification circuit connects the preceding left and right acoustic channels loud speaker SP1 in the compartment, SP2; The back surround sound signal SUL of treatment circuit, surround channel audio power amplifying circuit (6) after the SUR output connects 2, the input of (7), the output of this power amplification circuit connects the surround channel loud speaker SP4 in the compartment, SP5; The supper bass signal SB output of the low-pass filter circuit of treatment circuit (3) connects the input of supper bass power amplification circuit (8), and the output of this power amplification circuit connects the subwoofer SP3 in the compartment; The center channels signal SC output of treatment circuit connects the input of center channels audio power amplifying circuit (9), and the output of this power amplification circuit connects the center channels loud speaker SP6. in the compartment

6. the treatment circuit of automobile audio according to claim 1, the output that it is characterized in that F3 in the back surround sound treatment circuit (2) are to connect back surround sound signal SUL, SUR output by volume control potentiometer VR2; The supper bass output signal of low-pass filter circuit (3) is to regulate to form by volume control potentiometer VR3 to be supper bass output signal SB; Left and right acoustic channels composite signal R+L output is to regulate by volume control potentiometer VR4 to become center channels output signal SC.

7. according to the treatment circuit of claim 1 and 2 described automobile audios, it is characterized in that doubly-linked potentiometer VRmn can replace with double-pole switch, double-pole switch the 1st group selection contact connects the output of frequency compensation network F1 and the output of add circuit g1 respectively, double-pole switch the 2nd group selection contact ground connection, the double-pole contact of switch connects g2 respectively, the input of g4 and g3, the input of g4.

8. according to the treatment circuit of claim 1 and 6 described automobile audios, it is characterized in that back surround sound signal SUL, before SUR output and the center channels output signal SC, be serially connected with selector switch respectively, surround sound signal SUL wherein, the SUR output connects (KB2) that double-pole 3 is selected K switch B, (KB1) contact, K switch B the 1st group selection contact (KB2-1) is connected the adjustable side contact of potentiometer VR2 with (KB1-1), K switch B the 2nd group selection contact (KB2-2) and (KB1-2) ground connection, K switch B the 3rd group selection contact (KB2-3) is connected the d2 in the back surround sound treatment circuit (2), the output of d1 with (KB1-3); Center channels signal SC output connects (KC) contact that hilted broadsword 2 is selected K switch C, the 1st adjustable side contact of selecting contact (KC-1) to connect potentiometer VR4 of K switch C, and the 2nd of K switch C selects contact (KC-2) ground connection.

9. the treatment circuit of automobile audio according to claim 1, between the input of the audio power amplifying circuit that it is characterized in that the output of treatment circuit and be connected, be serially connected with that 6 cuttves are two selects change over switch KD, make the input of each channel audio power amplification circuit between the decoding output of the output of this treatment circuit and other modes, select to connect.

10. the treatment circuit of automobile audio according to claim 1 is characterized in that described volume control potentiometer VR2, VR3, and VR4, selector switch KB, KC, KD and treatment circuit are with being in the casing of automobile audio control panel.