CN1464763A

CN1464763A - Method for changing from double track to multi-track and acoustic treater

Info

Publication number: CN1464763A
Application number: CN 02123149
Authority: CN
Inventors: 王克刚
Original assignee: Princeton Technology Corp
Current assignee: Princeton Technology Corp
Priority date: 2002-06-19
Filing date: 2002-06-19
Publication date: 2003-12-31
Anticipated expiration: 2022-06-19
Also published as: CN1270583C

Abstract

The invention provides a method for converting the traditional uncoded double track sound system into real multi track system wherein instead the program of coding and decoding is not required, the original sound is used for various phase processing, then surrounding distribution, thus achieving the optimum playback effect. The invention also provides a sound processor to realize the method.

Description

The method of changing from double track to multi-track and acoustic treater thereof

Invention field

The present invention is a kind of method and acoustic treater thereof about changing from double track to multi-track, especially utilizes former sound to make various Phase Processing and reach its purpose.

Background of invention

Present very popular multichannel dolby system of sound system (Dolby System) and similar system thereof, these systems focus on existing multichannel is encoded into dual track earlier and transmits, and become original multichannel via specially designed decoder reduction then and play.

If have only the dual track source of sound, wish to utilize above-mentioned these systems' input dual tracks and when broadcasting multichannel, will produce wrong computing and form the effect of distortion.

So if having only the dual track source of sound, and wish to form the effect of multichannel, just must seek special design.

Summary of the invention

Therefore purpose of the present invention changes into real multi-channel system for the dual track sound system with traditional un-encoded, needn't be through the program of encoding and decoding, but utilizing former sound to make various Phase Processing, the ring field is distributed then, reaches the optimum efficiency of former sound reproducing.

The accompanying drawing summary

Fig. 1 is the ring field configuration schematic diagram of the present invention with changing from double track to multi-track.

Fig. 2 is an acoustic treater circuit diagram of the present invention.Wherein:

The audience 1

Nine kinds of acoustics CT, L, CRL, RL, RCT, RR, CRR, R, SUB

L channel sound equipment L _In

R channel sound equipment R _In

Low pass filter LPF

Operational amplifier OP1 and OP2

Control signal CTRL

Four switch SW1, SW2, SW3, SW4

Inverter IN

Resistor R 1, R2, R3, R4, R5, R6, R7, R8

Sound equipment output L _Out, R _Out

Detailed Description Of The Invention

Please refer to Fig. 1, it is the ring field configuration schematic diagram of the present invention with changing from double track to multi-track.Audience 1 is in central authorities, and nine acoustics ring field configurations are respectively CT, L, CRL, RL, RCT, RR, CRR, R and SUB.

Each acoustics is all imported traditional dual track sound equipment L _In(representing the L channel sound equipment) and R _In(representing the R channel sound equipment) is through specially designed acoustic treater circuit 2 (see figure 2)s wherein and produce separately special output.

The special output of nine acoustics is as follows:

1.CT：L _in+R _in

2.L：L _in

3.CRL：2L _in-(1/2)R _in

4.RL：2L _in-R _in

5.RCT：L _in+R _in

6.RR：2R _in-L _in

7.CRR：2R _in-(1/2)L _in

8.R：R _in

9.SUB：(L _in+R _in)×LPF

L wherein _InRepresent the L channel sound equipment, R _InRepresent the R channel sound equipment, LPF is a low pass filter.The acoustics that the space produced between nine acoustics are mutual is respectively 2L as shown in the figure _In+ R _In, 3L _In-(1/2) R _In, 4L _In-(1+1/2) R _In, 3L _In, 3R _In, 4R _In-(1+1/2) L _In, 3R _In-(1/2) L _In, 2R _In+ L _InAnd middle 2L _In+ 2R _In

Please refer to the described acoustic treater circuit diagram of the present invention of Fig. 2, wherein L channel sound equipment L _InWith R channel sound equipment R _InAll pass through some resistor input operational amplifier OP1 and OP2 respectively, also have a control signal CTRL in the middle of the circuit diagram, also have an inverter IN, as shown in the figure in order to control four switch SW1, SW2, SW3, SW4.

When control signal CTRL was electronegative potential, SW1 turn-offed, SW2 conducting, R channel sound equipment R at this moment _InCan't fail OP1, equal not have effect, OP1 only is subjected to L channel sound equipment L _InInfluence, this moment is according to the principle of operational amplifier, B point current potential L _OutShould be A point current potential * (R3+R4)/R3, and A point current potential should be L according to diagram _In* R2/ (R1+R2) is so L _Out=L _In* R2/ (R1+R2) * (R3+R4)/R3=L _In

When control signal CTRL is high potential, the SW1 conducting, SW2 turn-offs, at this moment R channel sound equipment R _InThrough '-' end of resistor R 3 input OP1, this moment is according to the principle of operational amplifier, R channel sound equipment R _InOrdering the output effect that is produced at B is R _InThe R4/R3=-1/2R of * (-) _In, L channel sound equipment L _InOrder the output effect that produced at B and be L as mentioned above _InSo, the combined potential L that B is ordered _Out=L _In-1/2R _In

In the above-mentioned acoustic treater circuit, because special design makes R1=R4, so R2=R3 is L channel sound equipment L _InCan be presented in L by former sound _Out, if will show R channel sound equipment R _InInfluence, as long as change the current potential of control signal CTRL, tell adding R channel sound equipment R so the user can know _InEffect.

In the above-mentioned acoustic treater circuit, though L _Out=L _In, but, just can change L if change the ratio of R1 and R2 _OutMiddle L _InThe coefficient of front; Change the ratio of R3 and R4, just can change L _OutMiddle R _InThe coefficient of front.

When should control signal CTRL being electronegative potential, SW3 turn-offs, the SW4 conducting, this moment L channel sound equipment L _InCan't import OP2, equal not have effect, OP2 only is subjected to R channel sound equipment R _InInfluence, this moment is according to the principle of operational amplifier, D point current potential R _OutShould be C point current potential * (R7+R8)/R7, and C point current potential should be R according to diagram _In* R6/ (R5+R6) is so R _Out=R _In* R6/ (R5+R6) * (R7+R8)/R7=R _In

When control signal CTRL is high potential, the SW3 conducting, SW4 turn-offs, at this moment L channel sound equipment L _InThrough resistor R 7 input OP2 '-' ends, this moment is according to the principle of operational amplifier, L channel sound equipment L _InOrdering the output effect that is produced at D is L _InThe R8/R7=-1/2L of * (-) _In, R channel sound equipment R _InOrder the output effect that produced at D and be R as mentioned above _InSo, D point combined potential R _Out=R _In-1/2L _In

In the above-mentioned acoustic treater circuit, because special design makes R5=R8, so R6=R7 is R channel sound equipment R _InCan be presented in R by former sound _Out, if will show L channel sound equipment L _InInfluence, as long as change the current potential of control signal CTRL, tell adding L channel sound equipment L so the user can know _InEffect.

In the above-mentioned acoustic treater circuit, though R _Out=R _In, but, just can change R if change the ratio of R5 and R6 _OutMiddle R _InThe coefficient of front; Change the ratio of R7 and R8, just can change R _OutMiddle L _InThe coefficient of front.

Get back among Fig. 1, in the special output of visible nine acoustics, L _InWith R _InThe coefficient of front is different separately, changes the result of the resistance ratio of dependent resistor exactly.

All available computer software such as acoustic treater circuit computing amplifier of the present invention, voltage divider, switch, resistor, inverter are realized in digital analogue mode.

Spirit of the present invention and scope only are subjected to the restriction of following claim, are not subjected to the restriction of above-mentioned special case.

Claims

1. the method for a changing from double track to multi-track, with the dual track sound equipment of traditional un-encoded program without encoding and decoding, but directly utilizing the original former sound of dual track sound equipment to do the synthetic processing of various phase places, the ring field is distributed then, reaches the optimum efficiency of former sound reproducing.

2. a changing from double track to multi-track acoustic treater comprises an operational amplifier; The dual track sound equipment, one of them sound channel is imported '+' end of this operational amplifier through a voltage divider, another sound channel is held through '-' of a resistor R 3 these operational amplifiers of input behind a switch again, the output of this operational amplifier then feeds back to '-' end of this operational amplifier through a resistor R 4, whether the input of this this another sound channel of switch may command.

3. acoustic treater as claimed in claim 2, comprise a resistor R 1 and a resistor R 2 in the wherein said voltage divider, a sound channel of dual track sound equipment is imported resistor R 1 and resistor R 2 in this voltage divider, the output of this voltage divider is then taken out by the contact of resistor R 1 with resistor R 2, and the pass between each resistor value is R1=R4 and R2=R3, and this relation makes the sound equipment of this operational amplifier '+' end of input not be subjected to the influence of this switch switch.

4. acoustic treater as claimed in claim 2, wherein said switch comprises two switches, wherein a switch SW 1 is subjected to control signal control and switch, 2 of another switch SW are subjected to this control signal control and switch through an inverter, described another sound channel is through switch SW 1 input resistor R3, and 2 of another switch SW are drawn and ground connection from switch SW 1 and input resistor R3 junction.

5. acoustic treater as claimed in claim 2, wherein change the resistance ratio between resistor R 1 and the R2 and/or change resistor R 3 and R4 between resistance ratio, original dual track combined acoustics can be become various required ratios, form multichannel audio, the ring field is distributed then, reaches the optimum efficiency of former sound reproducing.

6. as claim 2,3,4 or 5 acoustic treater, all available computer software such as wherein said operational amplifier, voltage divider, each switch, each resistor and inverter are realized in digital analogue mode.