CN104936089B - A kind of multi-channel system compressing method - Google Patents
A kind of multi-channel system compressing method Download PDFInfo
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Abstract
A kind of multi-channel system compressing method, if loud speaker group to be replaced and replacement loud speaker group are located on the same spherical surface, the centre of sphere of spherical surface is listening point, obtain the location information of all loud speakers, it calculates and replaces the original allocation coefficient that loud speaker group replaces single loud speaker to be replaced, it obtains replacing the signal of loud speaker group and deletes loud speaker to be replaced, obtain replacing the final signal of each loud speaker in loud speaker group by the method for summation.Conventional method replaces a loud speaker to be replaced using three loud speakers, 22.2 multi-channel systems can be simplified to 10 sound channels, 8 sound channel systems, but it is the failure to the physical property for keeping rebuilding sound at listening point completely, the present invention participates in replacing using the whole loud speakers replaced in loud speaker group, more fully keep the physical property of sound at listening point, the optimum allocation coefficient that multiple loud speakers replace a loud speaker can be obtained, the promotion for rebuilding sound field effect after multi-channel system is simplified is conducive to.
Description
Technical field
The invention belongs to field of acoustics more particularly to a kind of multi-channel system compressing methods.
Background technology
With the development of three-dimensional television and three-dimensional movie technology, three dimensional audio technology become MultiMedia Field one grinds
Study carefully hot spot.D translation is a kind of technology manufacturing virtual sound source using several loud speakers in three-dimensional sound field.In D translation
In method, the amplitude panning techniques (vector based amplitude panning are abbreviated as VBAP) based on vector are extensive
Approve.In three-dimensional VBAP, virtual sound source is synthesized with three loud speakers, and for starting point in listening point, terminal is in place in virtual sound source institute
The unit vector set can indicate that (for each vector starting point in listening point, terminal is in each vectorial institute with the other three SYSTEM OF LINEAR VECTOR
Corresponding loud speaker position, length 1).Three vector indicate coefficients by normalization after, as weight coefficient so that
The signal of virtual sound source is assigned to three loud speakers indicated corresponding to vector.If indicating the loud speaker number that virtual sound source uses
Mesh more than three, entire speaker volume of rebuilding is divided into several subspaces by VBAP technologies by three one group of loud speakers, every
In sub-spaces signal distribution is carried out according to VBAP.
5.1 multi-channel systems were once popular home theater audio systems.But with the hair of 3D video techniques
Exhibition, to Audiotechnica, more stringent requirements are proposed, and present multichannel audio research is absorbed in more advanced with more multichannel
System, better feeling of immersion can be provided for people.For example, 22.2 multi-channel systems in Japan Broadcasting Association laboratory are
It is used for ultra high-definition television relay.This advanced multi-channel system requires to place according to oneself unique loud speaker arrangement method
Loud speaker could generate best sound effect.Although 24 loud speakers can be placed in theater according to optimal method,
Trouble is put in domestic applications." lower mixed " is the method for reducing loudspeaker channel in multi-channel system well.It is mixed from 5.1 times
It has been standardized to two channel stereos or monophonic by ITU-R Recommendation, and has been used for some television receptions
Device.Although this mixing method is very efficient, it is not particularly suited for any number of speaker configurations.In order to enable multiple
Lower mix between system becomes feasible, and there is an urgent need to a kind of new sound field rebuildings or transformation technology by people.
The Akio Ando in Japan Broadcasting Association laboratory in 2011 propose a kind of new lower mixing method, and the method utilizes
Three loud speakers on same spherical surface replace the loud speaker that the spherical triangle that this three loud speakers are constituted surrounds, and (this four
A loud speaker is located on same spherical surface, and sphere centre is listening point), ensure to replace acoustic pressure size at front and back listening point position and
Proton velocity direction is constant, and this method provides physical basis theory for VBAP technologies, and recycling this method can gradual handle
22.2 multi-channel systems are simplified to 10 sound channels or 8 sound channel systems (two low-frequency channels are not dealt with), and hearing effect is better than tradition
Lower mixing method.The physical property of sound can be indicated that acoustic pressure is scalar, only size, matter jointly by acoustic pressure and proton velocity
Sub- speed is vector, has size and Orientation.Therefore the method for Akio Ando, which only ensure that, simplifies front and back acoustic pressure size and proton
The direction of speed has ignored the size of proton velocity, it will brings error to the reconstruction of 22.2 multi-channel systems.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of multi-channel system compressing methods.
Technical solution of the present invention provides a kind of multi-channel system compressing method, includes the following steps,
Step 1, if replacement loud speaker group and loud speaker group to be replaced are respectively positioned on same spherical surface, loud speaker group packet to be replaced
Include m loud speaker Spv1, Spv2 ..., Spvm, loud speaker Spv1, Spv2 ..., the original signal of Spvm be S, replacement is raised one's voice
Device group include n loud speaker Sp1, Sp2 ..., Spn, n<The sphere center position of m, spherical surface are listening point；N loud speaker Sp1 of acquisition,
Sp2 ..., Spn replace the signal that single loud speaker Spvh to be replaced is distributed, h=1,2 ..., m, including following sub-step
Suddenly,
Step 101, obtain m loud speaker Spv1, Spv2 ..., Spvm distinguish location information, n loud speaker Sp1,
Sp2 ..., Spn respectively location information；
Step 102, calculate determine n loud speaker Sp1, Sp2 ..., the original allocation coefficient w of Spnh1,wh2,…,whn, packet
It includes
It is as follows to build equation,
Wherein,
Wh=(wh1 wh2 … whn)T, T representing matrix transposition, whjIndicate that replacing loud speaker Spj is directed to loud speaker to be replaced
The signal distribution coefficient of Spvh, j=1,2 ..., n；
E1=(0 0 1)T；
θvhIndicate line between the positions loud speaker Spvh and origin O to be replaced XOY plane projection and X-axis it
Between angle, h=1,2 ..., m；
Indicate the angle between line and XOY plane, h between the positions loud speaker Spvh and origin O to be replaced
=1,2 ..., m；
θjIndicate angle of the line between the projection and X-axis of XOY plane between the positions loud speaker Spj and origin O,
J=1,2 ..., n；
Angle between the expression positions loud speaker Spj and origin O between line and XOY plane, j=1,2 ...,
n；Step 103, the signal of single loud speaker Spvh to be replaced is multiplied by step 102 gained original allocation coefficient respectively
wh1,wh2,…,whnAfter be assigned to respective speaker Sp1, Sp2 ..., in Spn, delete loud speaker to be replaced
Spvh, h=1,2 ..., m；
Step 2, be calculated loud speaker Sp1, Sp2 ..., Spn respectively signal, including by step 1 gained loud speaker
A series of corresponding signals summation that Spj is distributed, the final distribution signal calculation formula of loud speaker Spj are as follows：
Wherein, j=1,2 ..., n.
Moreover, n=10, m=22.
M speaker system provided by the invention is used to simplify for the method for n speaker system, compared to Akio
The lower mixing method that Ando was proposed in 2011 only can guarantee that the direction of acoustic pressure size and proton velocity is not at the front and back listening point of replacement
Become, the method for this patent not only ensure that the direction of acoustic pressure size and proton velocity is constant at the front and back listening point of replacement, but also ensure to replace
The error for changing front and back proton velocity size is minimum, is conducive to the effect for promoting synthesis virtual sound source.The present invention can to comprising appoint
The multi-channel system of multiple loud speakers of anticipating carries out simplifying processing, has good universality.
Description of the drawings
Fig. 1 is the basic flow chart of the present invention.
Fig. 2 is the loud speaker placement position to be replaced figure of the embodiment of the present invention.
Fig. 3 is the replacement loud speaker placement position figure of the embodiment of the present invention.
Specific implementation mode
The present invention is directed to the multi-channel system being placed on same spherical surface, it is proposed that a kind of multi-channel system compressing method,
The core technology of this method is to replace a loud speaker to be replaced using any number of loud speakers, below in conjunction with attached drawing and specifically real
Apply example the present invention will be described in detail technical solution.
The target of embodiment be by comprising 22 loud speaker Spv1, Spv2 ..., the multi-channel system of Spv22 simplify packet
Containing 10 loud speaker Sp1, Sp2 ..., the multi-channel system of Sp10.Assuming that 22 loud speaker Spv1, Spv2 ..., Spv22 be wait for
Replace loud speaker group, the original signal of each loud speaker is S, 10 loud speaker Sp1, Sp2 ..., Sp10 be to replace loud speaker
Group.Therefore the present invention mainly replaces a loud speakers to be replaced using 10 loud speakers, and gradually by 22 loud speaker Spv1,
Spv2 ..., Spv22 Sp1, Sp2 ..., Sp10 replace.It replaces loud speaker group and loud speaker group to be replaced is respectively positioned on same spherical surface
On, spherical radius is 2 meters, and the sphere center position of spherical surface is listening point.
When it is implemented, computer software technology, which can be used, in the method for the present invention realizes automatic running flow.Embodiment uses
What the method that 10 loud speakers replace a loud speakers to be replaced gradually realized 22.2 multi-channel systems simplifies process, referring to Fig. 1,
The there is provided flow of embodiment comprises the steps of：
Step 1, if m loud speaker Spv1, Spv2 ..., Spvm be located on the same spherical surface, loud speaker Spv1,
Spv2 ..., the original signal of Spvm be S, loud speaker Spv1, Spv2 ..., Spvm be loud speaker group to be replaced；N loud speaker
Sp1, Sp2 ..., Spn be to replace loud speaker group (n<M), for simplify loud speaker group Spv1, Spv2 to be replaced ..., Spvm, raise
Sound device Sp1, Sp2 ..., Spn can with loud speaker Spv1, Spv2 ..., part loud speaker position is identical in Spvm, also may be used
To differ completely.Obtain n loud speaker Sp1, Sp2 ..., Spn replacement one loud speaker Spvh (h=1,2 ..., m) to be replaced
The signal distributed, replaces loud speaker group and loud speaker group to be replaced is respectively positioned on same spherical surface, the sphere center position of spherical surface
For listening point.When it is implemented, n, m value that those skilled in the art can voluntarily determine as the case may be, realization method phase
Together.
Embodiment obtain 10 loud speaker Sp1, Sp2 ..., Sp10 replace the letter that single loud speaker to be replaced distributes
Number.Including following sub-step,
Step 101, obtain 22 loud speaker Spv1, Spv2 to be replaced ..., Spv22 respectively location information, 10 are replaced
Change loud speaker Sp1, Sp2 ..., Sp10 respectively location information；
If establishing three-dimensional cartesian coordinate system XYZ by coordinate origin O of listening point, the present invention uses polar form, such as point A
Coordinate (ρA,θA,) in, ρAIndicate point the distance between A and coordinate origin, θALine is in XOY between indicating point A and origin O
Angle between the projection and X-axis of plane,Indicate the angle between line and XOY plane between point A and origin O.Assuming that single
A loud speaker Spvh to be replaced (h=1,2 ..., 22) coordinate is (ρ, θvh,), 10 replacement loud speaker Sp1, Sp2 ...,
The coordinate of Sp10 is respectively (ρ, θ1,)、(ρ,θ2,)、(ρ,θ3,)、(ρ,θ4,)、(ρ,θ5,)、(ρ,θ6,)、(ρ,
θ7,)、(ρ,θ8,)、(ρ,θ9,)、(ρ,θ10,)。
Assuming that in the present embodiment, hollow dots indicate that the position of listening point, solid dot indicate loud speaker position.Replacement is raised
Sound device Sp1, Sp2 ..., Sp10 be located at the point on the surfaces ball O, referring to Fig. 3, loud speaker is distributed mainly on high angle
At Elevation=45 °, 0 °, -30 °, coordinate is respectively：Sp1(2,0°,90°)、Sp2(2,0°,45°)、Sp3(2,90°,
45°)、Sp4(2,180°,45°)、Sp5(2,0°,0°)、Sp6(2,60°,0°)、Sp7(2,120°,0°)、Sp8(2,180°,
0 °), Sp9 (2,270 °, 0 °), Sp10 (2,90 °, -30 °), loud speaker group Spv1, Spv2 to be replaced ..., Spv22 is located at
The point on the surfaces ball O, referring to Fig. 2, coordinate is respectively：Spv1(2,0°,90°)、Spv2(2,0°,45°)、Spv3(2,45°,45°)、
Spv4(2,90°,45°)、Spv5(2,135°,45°)、Spv6(2,180°,45°)、Spv7(2,225°,45°)、Spv8(2,
270°,45°)、Spv9(2,315°,45°)、Spv10(2,0°,0°)、Spv11(2,30°,0°)、Spv12(2,60°,0°)、
Spv13(2,90°,0°)、Spv14(2,120°,0°)、Spv15(2,150°,0°)、Spv16(2,180°,0°)、Spv17(2,
225°,0°)、Spv18(2,270°,0°)、Spv19(2,315°,0°)、Spv20(2,45°,-30°)、Spv21(2,90°,-
30°)、Spv22(2,135°,-30°)。
Step 102, calculate determine 10 replace loud speaker Sp1, Sp2 ..., the original allocation coefficient of Sp10.
According to single loud speaker Spvh (h=1,2 ..., m) the to be replaced acoustic pressure sizes generated at listening point and proton
Directional velocity replaces the acoustic pressure size that is generated at listening point of loud speaker with n and proton velocity direction is strictly equal, individually waits for
It replaces the proton velocity size that loud speaker Spvh (h=1,2 ..., m) is generated at listening point and replaces loud speaker in audition with n
The error principle as small as possible of the proton velocity size generated at point, the present invention propose original allocation coefficient numerical procedure：
The signal of the single loud speaker Spvh (h=1,2 ..., 22) to be replaced of embodiment calculating is assigned to 10 replacements and raises one's voice
The original allocation coefficient w of device signalh1, wh2..., wh10(h=1,2 ..., 22).
The acoustic pressure p that single loud speaker Spvh to be replaced is generated at listening pointvhFor：
10 replace loud speaker Sp1, Sp2 ..., the acoustic pressures that are generated at listening point of Sp10 be ph：
Wherein：
ρ indicates single the distance between the positions loud speaker Spvh to be replaced and coordinate origin O；
G indicate with a loudspeaker unit distance at the loud speaker acoustic pressure and loud speaker at generation acoustic pressure ratio system
Number；
E is math constant；
I is imaginary part unit；
K is wave number,F is sound signal frequencies；
C is the aerial spread speed of sound；
whjIndicate to replace the signal distribution coefficient that loud speaker Spj is directed to loud speaker Spvh to be replaced, j=1,2 ..., 10, h
=1,2 ..., 22；
S (ω) indicates the Fourier transformation of input speaker signal.
It is calculated by (1) is equal with (2) formula：
wh1+wh2+…+wh10=1 (3)
The proton velocity u that single loud speaker Spvh to be replaced is generated at listening pointvhFor：
Wherein：
ρ indicates single the distance between the positions loud speaker Spvh to be replaced and coordinate origin O；
θvhIndicate single projection and X-axis of the line in XOY plane between the positions loud speaker Spvh to be replaced and origin O
Between angle；
Indicate single angle between the positions loud speaker Spvh to be replaced and origin O between line and XOY plane；
G indicate with a loudspeaker unit distance at the loud speaker acoustic pressure and loud speaker at generation acoustic pressure ratio system
Number；
E is math constant；
I is imaginary part unit；
K is wave number,F is sound signal frequencies；
C is the aerial spread speed of sound；
λ is atmospheric density；
S (ω) indicates the Fourier transformation of input speaker signal.
10 replace loud speaker Sp1, Sp2 ..., the proton velocities that are generated at listening point of Sp10For：
Wh=(wh1 wh2 … wh10)T
Wherein：
θjIndicate that line is between the projection and X-axis of XOY plane between the replacement positions loud speaker Spj and origin O
Angle, j=1,2 ..., 10；
Angle between the expression replacement positions loud speaker Spj and origin O between line and XOY plane, j=1,
2 ..., 10；
whjThe signal distribution coefficient of expression replacement loud speaker Spj respectively, j=1,2 ..., 10, h=1,2 ..., 22.
It is obtained by (4) are equal with (5) formula：
(6) the first row in formula, the second row is respectively divided by the third line obtains：
(7) formula ensures that the proton velocity direction that loud speaker Spvh to be replaced is generated at listening point is raised one's voice with 10 replacements
Device Sp1, Sp2 ..., the proton velocity directions that are generated at listening point Sp10 it is equal.It can be obtained by equation (7)：
Joint (8) formula and (3) formula obtain：
Wherein：
Error E (the w of proton velocity size at listening pointh1,wh2,…,wh10) be：
For a Setting signal s (ω), 10 replace loud speaker Sp1, Sp2 ..., Sp10 location informations and individually wait replacing
Loud speaker Spvh (h=1,2 ..., 22) location information is changed,For a constant.Therefore so that proton velocity is big
Small error is minimum, i.e., so that formula E2Value minimum.
Then use 10 replace loud speaker Sp1, Sp2 ..., Sp10 replace single loud speaker Spvh to be replaced (h=1,
2 ..., 22) it is equivalent to solve：
Wherein,
Wh=(wh1 wh2 … whn)T, T representing matrix transposition；
E1=(0 0 1)T；
θvhIndicate that line is between the projection and X-axis of XOY plane between the positions loud speaker Spvh to be replaced and origin O
Angle, h=1,2 ..., m；
Indicate the angle between line and XOY plane, h=between the positions loud speaker Spvh to be replaced and origin O
1,
2 ..., m；
θjIndicate that line is between the projection and X-axis of XOY plane between the replacement positions loud speaker Spj and origin O
Angle, j=1,2 ..., n；
Angle between the expression replacement positions loud speaker Spj and origin O between line and XOY plane, j=1,
2 ..., n.
Equation (12), which can be used, has ripe algorithm solution, and the present embodiment is solved using trust domain algorithm.Other n, m values
This equation equally may be used.
In the present embodiment according to formula (12) can in the hope of use 10 replace loud speaker Sp1, Sp2 ..., Sp10 replaces respectively
Change single loud speaker Spvh (h=1,2 ..., 22) to be replaced obtain 10 replace loud speaker Sp1, Sp2 ..., Sp10 it is a series of
Original allocation coefficient, as shown in table 1.
1 signal original allocation coefficient of table
Step 103, the signal of single loud speaker Spvh (h=1,2 ..., 22) to be replaced is multiplied by respectively obtained by step 102
Original allocation coefficient wh1,wh2,…,wh10After be assigned to respective speaker Sp1, Sp2 ..., in Sp10, delete loud speaker to be replaced
Spvh (h=1,2 ..., 22)；
In the present embodiment, the signal of loud speaker Spv1 to be replaced is multiplied by the original allocation coefficient 1 in table 1 respectively, 0,0,
0,0,0,0,0,0,0 can be obtained loud speaker Sp1, Sp2 ..., the original allocation signal of Sp10, delete loud speaker to be replaced
Spv1.The signal of remaining loud speaker to be replaced carries out similar operations successively.
Step 2, be calculated loud speaker Sp1, Sp2 ..., Spn respectively signal, including by step 1 gained loud speaker
A series of corresponding signals summation that Spj is distributed, the final distribution signal calculation formula of loud speaker Spj are
Wherein, j=1,2 ..., n.
Embodiment calculate separately to obtain replace loud speaker Sp1, Sp2 ..., the signal of Sp10, replace loud speaker Spj (j=1,
2 ..., 10) final distribution signal calculation formula is as follows：
In the present embodiment, replace loud speaker Sp1 loud speaker Spv1, Spv2 to be replaced ..., replaced for 22 times of Spv22
The original allocation coefficient obtained in journey is respectively：1,0,0,0,0,0,0.1464,0.5,0.1464,0,0,0,0,0,0,0,0,0,
0,0,0,0, as shown in 1 secondary series of table, the final distribution signal for obtaining replacing loud speaker Sp1 according to formula (13) is Sf1=
1.7928S.Remaining final signal for replacing loud speaker can be obtained by carrying out similar calculate.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (2)
1. a kind of multi-channel system compressing method, it is characterised in that：Include the following steps,
Step 1, if replacement loud speaker group and loud speaker group to be replaced are respectively positioned on same spherical surface, loud speaker group to be replaced includes m
A loud speaker Spv1, Spv2 ..., Spvm, loud speaker Spv1, Spv2 ..., the original signal of Spvm be S, replace loud speaker group
Including n loud speaker Sp1, Sp2 ..., Spn, n<The sphere center position of m, spherical surface are listening point；N loud speaker Sp1 of acquisition,
Sp2 ..., Spn replace the signal that single loud speaker Spvh to be replaced is distributed, h=1,2 ..., m, including following sub-step
Suddenly,
Step 101, obtain m loud speaker Spv1, Spv2 ..., Spvm distinguish location information, n loud speaker Sp1, Sp2 ...,
The location informations of Spn respectively；
Step 102, calculate determine n loud speaker Sp1, Sp2 ..., the original allocation coefficient w of Spnh1,wh2,…,whn, including structure
It is as follows to build equation,
s.t.LWh=E1
wh1,wh2,…whn≥0
Wherein,
Wh=(wh1 wh2 … whn)T, T representing matrix transposition, whjIndicate that replacing loud speaker Spj is directed to loud speaker Spvh to be replaced
Signal distribution coefficient, j=1,2 ..., n；
E1=(0 0 1)T；
θvhLine is between the projection and X-axis of XOY plane between indicating the positions loud speaker Spvh and origin O to be replaced
Angle, h=1,2 ..., m；
Indicate the angle between line and XOY plane between the positions loud speaker Spvh and origin O to be replaced, h=1,
2 ..., m；
θjAngle of the line between the projection and X-axis of XOY plane between the expression positions loud speaker Spj and origin O, j=1,
2 ..., n；
Indicate the angle between line and XOY plane, j=1,2 ..., n between the positions loud speaker Spj and origin O；Step
Rapid 103, the signal of single loud speaker Spvh to be replaced is multiplied by step 102 gained original allocation coefficient w respectivelyh1,wh2,…,
whnAfter be assigned to respective speaker Sp1, Sp2 ..., in Spn, delete to be replaced loud speaker Spvh, h=1,2 ..., m；
Step 2, be calculated loud speaker Sp1, Sp2 ..., the signals of Spn respectively, including by loud speaker Spj points of gained in step 1
With a series of obtained corresponding signals summation, the final distribution signal calculation formula of loud speaker Spj is as follows：
Wherein, j=1,2 ..., n.
2. multi-channel system compressing method according to claim 1, it is characterised in that：N=10, m=22.
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