CN1276959A - Post-amplification stereophonic to surround sound decoding circuit - Google Patents
Post-amplification stereophonic to surround sound decoding circuit Download PDFInfo
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Abstract
A post-amplification stereophonic to surround sound decoding circuit is described herein. The decoding circuit includes inputs to be connected to a stereophonic power amplifier to receive a powered amplified stereophonic signal and outputs to be connected to left and right main loudspeakers, to left and right secondary loudspeakers and to a central loudspeaker. The decoding circuit includes secondary channels decoding circuit decoding left and right surround channel signals to be supplied to the left and right secondary loudspeakers, respectively, and a central channel decoding circuit decoding a central channel signal to be supplied to the central loudspeaker. The central channel decoding circuit includes two decoupling capacitors decoupling the left and right signals from the powered amplified sterepohonic signal before combining these signals to yield the central channel signal. This decoupling action prevents "bleeding" of the left and right signals that would degrade the stereophonic signal.
Description
The present invention is relevant with stereo-surround sound decoding circuit.Specifically, the present invention is relevant with stereo-surround sound decoding circuit after the amplification that is installed between traditional stereo amplifier and the traditional loud speaker.
Though in Modulation and Amplitude Modulation (AM) radio and telephone network, still adopt monophone widely, think to be stereo now in high-fidelity (Hi-Fi) application standard.
The purpose of stereophonic sound system is by two different sound channels of loud speaker reproduction, makes the sound that arrives each ear of audience seem to the audience that he is in the impression of the position of recording.Certainly, provide such impression and depend on many factors, for example the quality of the relative position of this audience and loud speaker and recording.
In domestic electronic appliances, introduced the ambiophonic system that is called home theater now, the audience is soaked among the environment from the alternative sounds of more indoor positions.The home theater ambiophonic system of standard is equipped with five loud speakers, separately reproduction sound channel separately.
Surround sound decoding circuit used in the ambiophonic system can be divided into two major types usually, decoding circuit and amplification back decoding circuit before promptly amplifying.
Adopt traditional low level sterephonic signal of ambiophonic system reception of decoding circuit before amplifying, it is extended to a five-sound channel surround sound.After amplifying respectively, these five sound channels are added on the predetermined loud speaker separately.Five sound channels are decided to be usually:
Main L channel, corresponding with the L channel of stereophonic signal, by a preceding left speaker reproduction;
Main R channel, corresponding with the R channel of stereophonic signal, by right loud speaker reproduction before;
Secondary L channel is also referred to as left surround channel, draws by main L channel being deducted main R channel decoding, by left speaker reproduction after;
Secondary R channel is also referred to as right surround channel, draws by main R channel being deducted main L channel decoding, by loud speaker reproduction after; And
Center channel is by drawing main L channel and main R channel addition decoding, by the center loudspeaker reproduction that is placed in usually on the video screen top.
Adopting the major defect of the ambiophonic system of decoder before amplifying is must need a five-sound channel amplifier in order to reappear surround sound, because power amplification is carried out after surround sound occurring from stereo decoding.Therefore, adopt the power amplifier of a special use of the essential configuration of user of this technology, this has just increased the cost of system.
Amplify the back surround sound decoder by dispose one can be installed in traditional stereo amplifier left and right through power amplification the stereophonic signal output and the device between five above-mentioned loud speakers can overcome above-mentioned amplification usually before the shortcoming of decoder.Therefore, the decoding of stereo-surround sound is carried out after power amplification, and this just can adopt traditional stereo amplifier.
The U.S. Patent No. 5 that on November 23rd, 1993 was presented to people such as Madnick, 265,166 " multichannel audio analogue systems " (" Multi-Channel Sound SimulationSystem ") have disclosed so a kind of amplification back stereo-surround sound decoder.The major defect of the system that people such as Madnick disclose is to cause the complexity increase that sound reproduction quality descends and load influences stereo amplifier usually.As the personnel that are familiar with this technical field be readily appreciated that, the negative terminal tieback of back loud speaker will make power amplifier output institute " see " to ground impedance is not 8 ohm of traditional loudspeaker impedances.In addition, the negative terminal of center loudspeaker also will increase the complexity of power amplifier load through an inductance tieback to ground, thereby cause causes of sound distortion increase and sound equipment to reappear total deleterious inevitably.Should also be noted that left and right sound channels merges the generation center channel by resistance and will reduce the definition of main left and right sound channels, because do not prevent the measure that left and right sound channels is leaked mutually.
Be presented to the U.S. Patent No. 5 of Robert J.Rapoport on March 5th, 1996,497,425 " multitrack surround sound analogue means " (" Multi-Channel SurroundSound Simulation Device ") disclosed a kind of compound stereo-surround sound decoder, have before the above-mentioned amplification and the characteristics of amplifying the back decoding scheme.Also there are many shortcomings in the system that Rapoport proposes.For example, must dispose an auxiliary power amplifier and amplify center channel, deliver to the center loudspeaker reproduction again.In addition, more than the system of the common Rapoport of shortcoming that people's such as Madnick system is touched upon also exist because the basic principle of design is similar.
Therefore, the purpose of this invention is to provide a kind of stereo after improved amplification-surround sound decoding device that does not have above-mentioned prior art shortcoming.
Specifically, according to the present invention, stereo after the amplification that is provided-surround sound decoding circuit comprises:
Reception is through the input of the stereophonic signal that comprises a left channel signals and a right-channel signals of power amplification;
One is configured to first output that is connected with a secondary left speaker;
One is configured to second output that is connected with a right loud speaker of pair;
One is configured to the 3rd output that is connected with a center loudspeaker;
Go out the secondary channel decoding device of a secondary left channel signals and a secondary right-channel signals from left and right sound channels signal decoding through the stereophonic signal of power amplification, described secondary left channel signals is delivered to first output, and described secondary right-channel signals is delivered to second output; And
Go out the center channel decoding device of a center channel signal from left and right sound channels signal decoding through the stereophonic signal of power amplification, it comprises the first and second decoupling zero devices of respectively the left and right sound channels signal being decoded, comprise that also the left and right sound channels signal through decoupling zero is merged into the device that the center channel signal is delivered to the 3rd output, thereby the decoupling zero device of center channel decoding device can merge left and right sound channels signal through the stereophonic signal of power amplification and can not change original left and right sound channels signal.
According to another kind of realization situation of the present invention, stereo after the amplification that is provided-surround sound decoding circuit comprises:
Reception is through the input of the stereophonic signal that comprises a left channel signals and a right-channel signals of power amplification;
One is configured to first output that is connected with a secondary left speaker;
One is configured to second output that is connected with a right loud speaker of pair;
One is configured to the 3rd output that is connected with a center loudspeaker;
One is configured to the 4th output that is connected with a main left speaker;
One is configured to the 5th output that is connected with a right loud speaker of master;
The secondary channel decoding device of a secondary left channel signals and a secondary right-channel signals from the left and right sound channels signal decoding of the main body acoustical signal of amplifying through rate, described secondary left channel signals is delivered to first output, and described secondary right-channel signals is delivered to second output;
Go out the center channel decoding device of a center channel signal from left and right sound channels signal decoding through the stereophonic signal of power amplification, it comprises the first and second decoupling zero devices that respectively the left and right sound channels signal carried out decoupling zero, also comprises the left and right sound channels signal through decoupling zero is merged into the device that the center channel signal is delivered to the 3rd output; And
Control (a) left channel signals deliver to the amplitude of the 4th output and (b) right-channel signals deliver to the main sound channel sound volume control device of the amplitude of the 5th output,
Thereby the decoupling zero device of center channel decoding device can merge the left and right sound channels signal through the stereophonic signal of power amplification and can not change original left and right sound channels signal.
According to another realization situation of the present invention, the center channel decoding circuit of stereo after the amplification that is provided-surround sound decoding device comprises:
Reception is through the input of the stereophonic signal that comprises a left channel signals and a right-hand signal of power amplification;
One is configured to the output that is connected with a center loudspeaker; And
Go out the center channel decoding device of a center channel signal from left and right sound channels signal decoding through the stereophonic signal of power amplification, it comprises the first and second decoupling zero devices that respectively the left and right sound channels signal carried out decoupling zero, also comprise the left and right sound channels signal through decoupling zero is merged into the device that the center channel signal is delivered to output, thereby the decoupling zero device of center channel decoding device can merge left and right sound channels signal through the stereophonic signal of power amplification and can not change original left and right sound channels signal.
Other purposes of the present invention and advantage can be clear that from the non-limitative illustration of preferred embodiment being done below in conjunction with accompanying drawing for the personnel that are familiar with this technical field.
In these accompanying drawings:
Fig. 1 shows by stereo-surround sound decoding circuit after the amplification of one embodiment of the present of invention design with the form of block diagram, and this decoding circuit is connected between a stereo power amplifier and five loud speakers;
Fig. 2 shows stereo-surround sound decoding circuit after the amplification among Fig. 1 with the form of schematic diagram; And
Fig. 3 shows another embodiment of the center channel decoding circuit among Fig. 2 with the schematic diagram form.
Below in conjunction with Fig. 1 and Fig. 2 illustrate amplify the back stereo-surround sound decoding circuit 10.
As shown in Figure 1, decoding circuit 10 is connected with stereo power amplifier 12.Decoding circuit 10 comprises left input 14, right input 16 and earth terminal 18, is connected to left output 20, right output 22 and the earth terminal 24 of stereo power amplifier 12 respectively.Certainly, the tie point 20,22 and 24 of power amplifier 12 usually is to be connected to a traditional main left side, main right two loud speakers.
As seen from Figure 1, main sound channel volume control circuit 46 be connected on input 14,16 and 18 and main loudspeaker output 26,27,30 and 31 between, secondary channel decoding circuit 48 be connected on input 14 and 16 and secondary loud speaker output 34,35,38 and 39 between, and center channel decoding circuit 50 be connected on input 14,16 and 18 and center loudspeaker output 42 and 43 between.
Describe circuit 46,48 and 50 in detail below in conjunction with Fig. 2.
Main sound channel volume control circuit 46 comprise one be connected on left input 14 and be connected to variable resistor 52 between the output 26 of main left speaker and one be connected on right input 16 and be connected to variable resistor 54 between the output 30 of main right loud speaker.By changing the resistance of resistance 52 and 54, can adjust signal and be added to amplitude on the main loudspeaker, thereby change the volume of the sound of main loudspeaker reproduction, because changed that part of power that the signal through power amplification dissipates in resistance as heat like this.As seen from Figure 2, earth terminal 27 and 31 interconnects, and is connected to input grounding end 18 together.
Be to be noted that variable resistor 52 and 54 can advantageously combine with the realization of a stereo L attenuator (earth-free) form, has suitable rated power.If this is the case, actor will be faced with the problem that two main loudspeakers have only a volume control.In addition, these two variable resistors also can be realized with one group of high-quality discrete resistors (not shown) and switch (not shown), also can realize with a high power variable resistor integrated circuit (not shown).
Therefore, be noted that, here with claims in, so-called " variable resistor " is meant any ohmic electronic device or structure and/or can changes other electronic devices of resistance between 2 in the circuit.
Secondary channel decoding circuit 48 comprises that one is connected on left input 14 and is connected to first electric capacity 56 between the output 34 of secondary left speaker, one and is connected on right input 16 and is connected to second electric capacity 58 and a variable resistor 60 that is connected between output earth terminal 35 that is connected to secondary left speaker and the output earth terminal 39 that is connected to secondary right loud speaker between secondary right loud speaker and the output 38.It should be noted that output earth terminal 35 is not connected with input grounding end 18 with 39.
As being familiar with personnel saw of this technical field, the variable resistor 60 that is connected between the output earth terminal 35 and 39 makes two secondary loud speakers reappear the sub-channel signal separately that obtains by the signal subtraction that will deliver to input 14 and 16 respectively.Specifically, the secondary left channel signals of secondary left speaker reproduction is that the signal that is added to left input 14 deducts the signal that is added to right input 16.Similar, the secondary right-channel signals of secondary right loud speaker reproduction is that the signal that is added to right input 16 deducts the signal that is added to left input 14.Because secondary channel decoding circuit 48 is also earth-free, a secondary left side and secondary right-channel signals equate, deducts input 14 and equal to import 14 and deduct input 16 because import 16.In addition, because electric capacity 56 and 58 is decoupling capacitance in some sense, and because secondary channel decoding circuit 48 is earth-free, so the interconnection of earth terminal 35 and 39 will not have harmful effect to being added to main sound channel volume control circuit 46 with the signal that is added to center channel decoding circuit 50, because electric capacity 56 and 58 has stoped the signal " leakage " that is added to input 14 to go into to be added to the signal of input 16, vice versa.
By changing the resistance of resistance 60, just can adjust the amplitude of the signal that is added to secondary loud speaker, therefore changed the volume of the sound of secondary loud speaker reproduction, because the signal conduct that has changed through power amplification dissipates the heat in ohmically that part of power.
The own discovery of industry beneficially selects the feasible impedance with secondary loud speaker of the capacity of electric capacity 56 and 58 to constitute a high pass filter about 100Hz.
Center channel decoding circuit 50 comprises that first a fixed resistance value resistance 62 that is connected to left input 14, one are connected to first electric capacity 64 of first resistance 62, one and are connected to the second fixed resistance value resistance 66 of right input 16, second electric capacity 68 that is connected to second resistance 66 and one and are connected on electric capacity 64 and 68 and be connected to variable resistor 70 between the output 42 of center loudspeaker.Earth terminal 43 is connected with input grounding end 18.
Therefore, the signal that is added to center loudspeaker output 42 is the signal sum that power amplifier 12 is added to left and right input 14 and 16.
It should be noted, because electric capacity 64 and 68 is decoupling capacitance in some sense, so the interconnection of the output of these two electric capacity makes left and right input 14 and 16 additions can with the signal that is added to secondary channel decoding circuit 48 harmful effect not arranged to being added to main sound channel volume control circuit 46.
The resistance of fixed resistance 62 and 64 is beneficially selected in the own discovery of industry, makes them respectively be 1/2nd of the normal impedance of main loudspeaker.The capacity of electric capacity 64 and 68 is beneficially selected in also own discovery, and feasible impedance with center loudspeaker constitutes a high pass filter about 100Hz.
Equally,, can adjust the amplitude of the signal that is added to center loudspeaker, therefore change the volume of the sound of center loudspeaker reproduction, because the signal conduct of having adjusted through power amplification dissipates the heat in ohmically that part of power by changing the resistance of resistance 70.
It should be noted that variable resistor 60 and 70 can have suitable rated power advantageously with independently monophony L attenuator (earth-free) form realization.In addition, variable resistor 60 and 70 also can be realized with one group of high-quality discrete resistors (not shown) and switch (not shown), also can realize with high power variable resistor integrated circuit (not shown).
Be briefly described another kind of center channel decoding circuit 150 below in conjunction with Fig. 3.The main difference of the decoding circuit 50 among decoding circuit 150 and Fig. 2 is a pair of variable resistor 170,170 of the variable resistor 70 usefulness ' replacements that are configured in after left and right input interconnects, be configured in respectively between fixed resistance value resistance 62,66 and the electric capacity 64,68, so before just being configured in left and right input interconnection.Decoding circuit 150 has improved the stability of impedance and frequency, and makes more available horsepower deliver to center loudspeaker.
Equally, it should be noted variable resistor 170 and 170 ' can advantageously combine and realize having suitable rated power with a stereo L attenuator (earth-free) form.In addition, these two variable resistors also can be realized with one group of high-quality discrete resistors (not shown) and switch (not shown), also can realize with a high power variable resistor integrated circuit (not shown).
Get back to Fig. 2, it should be noted, the impedance of stereo-surround sound decoding circuit 10 is same with the impedance phase of main loudspeaker basically after the output 20,22 of power amplifier 12 and the amplification of 24 " seeing ", because decoding circuit 48 and 50 has all been used decoupling capacitance, so with regard to impedance, be actually " cannot see ".Really, decoding circuit 48 and 50 impedance be far above main loudspeaker 28 in parallel with them usually and 32 impedance, thereby make the output 20,22 and the not significantly change of 24 impedances of being seen of power amplifier.
As shown in Figure 2, between input 14,16,18 and circuit 46,48,50, be connected to fuse 72,74,76, as circuit protection.Should be noted also that and advantageously to dispose an on-off switch (not shown), so that when the user wishes only not wish to hear surround sound with main loudspeaker, circuit 48 and 50 is disconnected from input 14,16,18.
Oneself finds industry, need be with not with the capacitor of polarity for decoding electric capacity of the present invention.Certainly, as be familiar with this technical field personnel known, also can with coupling be the band polarity capacitor to replacing.
Though be to be noted that above circuit the 46,48, the 50th, illustrate that with discrete circuit these circuit can advantageously lump together on a printed circuit board (PCB) (not shown) and realize.
As the personnel that are familiar with this technical field are understandable, more than just provide as an example in conjunction with the circuit 46,48,50 of explanation shown in Figure 2, can be according to spiritual correct of the present invention.Should be noted also that each circuit can have volume control, makes the user can adjust the volume of every group of these three groups of loud speaker of main loudspeaker, secondary loud speaker and center loudspeaker.Really, oneself discovery certain user of industry likes hearing surround channel (by secondary loud speaker reproduction) and the center channel (by the center loudspeaker reproduction) than the bigger or smaller volume that is considered to the best.In addition, because decoding circuit 10 can be connected to some different power amplifiers and be connected to some different loud speakers, therefore independently volume control helps these difference are compensated.Yet stereo after the fairly simple and economic amplification-surround sound decoding circuit can save variable resistor 52,54,60 and 70 (or 170,170 ').Equally, also can save fuse 72,74 and 76 in the circuit, because these fuses provide overload protection nothing but.Be noted that such simplification circuit (not shown) versatility is relatively poor, because the user does not have the means of three groups of loud speakers of independent control.
It should be noted, even stereo-surround sound decoding circuit 10 comprises each output that is connected to a main left side and main right loud speaker after the top illustrated amplification, but for the personnel that are familiar with this technical field, under the situation that decoder will be used with a power amplifier that two pairs of left and right outputs are provided, it can be designed to a decoding device (not shown) that does not have these outputs.Really, pair of output can directly be connected to a main left side and main right loud speaker, and another can be connected to this decoding device to output, to draw an aforesaid secondary left side, secondary right and central authorities' output.Certainly, the versatility of this decoding device is relatively poor, because the means of the signal that is added to main loudspeaker not being carried out independent control are provided, and sort circuit can only be used for above-mentioned this power amplifier or is used with a plurality of integrated amplifiers that have public floating ground.
It should be appreciated that, this amplify the back stereo-surround sound decoding circuit 10 can advantageously be encapsulated in the box of the suitable connector that disposes the input that is used for circuit 10 and output, forms stereo-surround sound decoding device after the amplification.Preferably the adjuster with variable resistor 52,54,60 and 70 is configured in the position that the user can enough reach.In addition, decoding circuit 10 can be installed in the traditional power amplifier, does not need five surround sound power amplifiers that amplify sound channel thereby can obtain one.
The right polarity of these outputs it is to be noted at last, can mix suitable switching device (not shown) to 34 and 35,38 and 39,42 and 43, so that can be put upside down for output.Really, putting upside down these selectively can adjust the surround sound reproduction making the user.
As the personnel that are familiar with this technical field can see, amplification of the present invention back is stereo-the surround sound decoding circuit is compared with the stereo-surround sound decoding circuit of prior art has many advantages, for example:
Decoding is carried out after power amplification, therefore makes the user can still use his traditional upright sound body power amplifier;
Decoding circuit can be compatible with professional loud speaker with daily electrical equipment;
Decoding circuit can be compatible with the power professional audio amplifier with daily electrical equipment;
Decoding circuit makes the user can adjust his effect of listening to by the independent volume that changes three groups of loud speakers;
It is compatible with various two known sound channel hybrid coding standards to decode, for example with the home theater surround sound of Dolby development in laboratory and the Pro_Logic of Lucas Arts entertainment company exploitation
TMTechnology and THX
TMTechnology is compatible;
Decoding circuit does not need extra power supply;
Decoding circuit provides quite wide frequency band for central and surround channel;
Decoding circuit can be easy to be designed to be fit to unique and loudspeaker impedance load complexity;
Decoding circuit can be easy to be designed to by the signal of the device handle high power with suitable rated power is provided;
Decoding circuit can be easy to be designed to be fit to different application, for example multimedia calculating, car audio system, virtual reality applications; And
Decoding circuit can be easy to be designed to have a computer-controlled interface, to control each volume, for example, if this specific decoding circuit will be used by a computer-controlled application program.
Though abovely describe the present invention in conjunction with a preferred embodiment of the present invention, the correct on demand of this preferred embodiment, this does not depart from the spirit of the present invention as defined in appended claims.
Claims (25)
1. stereo-surround sound decoding circuit after the amplification comprises:
Reception is through the input of the stereophonic signal that comprises a left channel signals and a right-channel signals of power amplification;
One is configured to first output that is connected with a secondary left speaker;
One is configured to second output that is connected with a right loud speaker of pair;
One is configured to the 3rd output that is connected with a center loudspeaker;
Go out the secondary channel decoding device of a secondary left channel signals and a secondary right-channel signals from left and right sound channels signal decoding through the stereophonic signal of power amplification, described secondary left channel signals is delivered to described first output, and described secondary right-channel signals is delivered to described second output; And
Go out the center channel decoding device of a center channel signal from left and right sound channels signal decoding through the stereophonic signal of power amplification, described center channel decoding device comprises the first and second decoupling zero devices that respectively the left and right sound channels signal carried out decoupling zero, also comprise the device that is merged into described center channel signal through the left and right sound channels signal of decoupling zero with described, described center channel signal is delivered to described the 3rd output
Thereby the described decoupling zero device of described center channel decoding device can merge the left and right sound channels signal through the stereophonic signal of power amplification and can not change original left and right sound channels signal.
One kind as in claim 1 stereo-surround sound decoding circuit after the amplification of defined, wherein said center channel decoding device also comprises the device of the amplitude of controlling described center channel signal.
One kind as in claim 2 stereo-surround sound decoding circuit after the amplification of defined, wherein said amplitude control unit comprises at least one variable resistor.
One kind as in claim 1 stereo-surround sound decoding circuit after the amplification of defined, the described first and second decoupling zero devices of wherein said center channel decoding device comprise first and second electric capacity respectively.
One kind as in claim 4 stereo-surround sound decoding circuit after the amplification of defined, the wherein said first decoupling zero device comprises first resistance with described first capacitances in series, be connected to described input and receive described left channel signals, and the described second decoupling zero device comprises second resistance with described second capacitances in series, be connected to described input and receive described right-channel signals, described first and second electric capacity are interconnected, and will be merged into described center channel signal through the left channel signals of decoupling zero with through the right-channel signals of decoupling zero.
One kind as in claim 1 stereo-surround sound decoding circuit after the amplification of defined, wherein said secondary channel decoding device comprises the first and second decoupling zero devices that respectively described left and right sound channels signal carried out decoupling zero.
One kind as in claim 6 stereo-surround sound decoding circuit after the amplification of defined, the described first and second decoupling zero devices of wherein said secondary channel decoding device comprise first and second electric capacity respectively, described first electric capacity is connected between described input and described first output, and described second electric capacity is connected between described input and described second output.
One kind as in claim 6 stereo-surround sound decoding circuit after the amplification of defined, wherein said first and second outputs respectively comprise an earth terminal, and described secondary channel decoding device also comprises a variable resistor between the described earth terminal that is connected on described first and second outputs.
9. stereo-surround sound decoding circuit after the amplification comprises:
Reception is through the input of the stereophonic signal that comprises a left channel signals and a right-channel signals of power amplification;
One is configured to first output that is connected with a secondary left speaker;
One is configured to second output that is connected with a right loud speaker of pair;
One is configured to the 3rd output that is connected with a center loudspeaker;
One is configured to the 4th output that is connected with a main left speaker;
One is configured to the 5th output that is connected with a right loud speaker of master;
Go out the secondary channel decoding device of a secondary left channel signals and a secondary right-channel signals from stereophonic signal left and right sound channels signal decoding through power amplification, described secondary left channel signals is delivered to described first output, and described secondary right-channel signals is delivered to described second output;
Go out the center channel decoding device of a center channel signal from left and right sound channels signal decoding through the stereophonic signal of power amplification, described center channel decoding device comprises the first and second decoupling zero devices that respectively the left and right sound channels signal carried out decoupling zero, also comprise being merged into the device of described center channel signal with described through the left and right sound channels signal of decoupling zero, described center channel signal is delivered to described the 3rd output; And
Control (a) left channel signals deliver to the amplitude of the 4th output and (b) right-channel signals deliver to the main sound channel sound volume control device of the amplitude of the 5th output,
Thereby the described decoupling zero device of described center channel decoding device can merge the left and right sound channels signal through the stereophonic signal of power amplification and can not change original left and right sound channels signal.
One kind as in claim 9 stereo-surround sound decoding circuit after the amplification of defined, wherein said center channel decoding device also comprises the device of the amplitude of controlling described center channel signal.
11. one kind as in claim 10 stereo-surround sound decoding circuit after the amplification of defined, wherein said amplitude control unit comprises at least one variable resistor.
12. one kind as in claim 9 stereo-surround sound decoding circuit after the amplification of defined, the described first and second decoupling zero devices of wherein said center channel decoding device comprise first and second electric capacity respectively.
13. one kind as stereo-surround sound decoding circuit after the amplification of defined in claim 12, the wherein said first decoupling zero device comprises first resistance with described first capacitances in series, be connected to described input and receive described left channel signals, and the described second decoupling zero device comprises second resistance with described second capacitances in series, be connected to described input and receive described right-channel signals, described first and second electric capacity are interconnected, and will be merged into described center channel signal through the left channel signals of decoupling zero with through the right-channel signals of decoupling zero.
14. one kind as in claim 9 stereo-surround sound decoding circuit after the amplification of defined, wherein said secondary channel decoding device comprises the first and second decoupling zero devices that respectively described left and right sound channels signal carried out decoupling zero.
15. one kind as stereo-surround sound decoding circuit after the amplification of defined in claim 14, the described first and second decoupling zero devices of wherein said secondary channel decoding device comprise first and second electric capacity respectively, described first electric capacity is connected between described input and described first output, and described second electric capacity is connected between described input and described second output.
16. one kind as stereo-surround sound decoding circuit after the amplification of defined in claim 14, wherein said first and second outputs respectively comprise an earth terminal, and described secondary channel decoding device also comprises a variable resistor between the described earth terminal that is connected on described first and second outputs.
17. one kind as stereo-surround sound decoding circuit after the amplification of defined in claim 9, wherein said main sound channel sound volume control device comprises (a) one first variable resistor, connects into to described the 4th output with described the 4th output and described input and presents described left channel signals; And (b) the second adjustable resistance, connect into to described the 5th output with described the 5th output and described input and to present described right-channel signals.
18. a center channel decoding circuit that is used to amplify afterwards stereo-surround sound decoding device comprises:
Reception is through the input of the stereophonic signal that comprises a left channel signals and a right-channel signals of power amplification;
One is configured to the output that is connected with a center loudspeaker; And
Go out the center channel decoding device of a center channel signal from left and right sound channels signal decoding through the stereophonic signal of power amplification, described center channel decoding device comprises the first and second decoupling zero devices that respectively the left and right sound channels signal carried out decoupling zero, also comprise the device that is merged into described center channel signal through the left and right sound channels signal of decoupling zero with described, described center channel signal is delivered to described output
Thereby the described decoupling zero device of described center channel decoding device can merge the left and right sound channels signal through the stereophonic signal of power amplification and can not change original left and right sound channels signal.
19. one kind as in claim 18 the center channel decoding circuit of defined, also comprise the device of the amplitude of described center channel signal.
20. the center channel decoding circuit as defined in claim 18, wherein said amplitude control unit comprises at least one variable resistor.
21. the center channel decoding circuit as defined in claim 18, the wherein said first and second decoupling zero devices comprise first and second electric capacity respectively.
22. center channel decoding circuit as defined in claim 21, the wherein said first decoupling zero device comprises first resistance with described first capacitances in series, be connected to described input and receive described left channel signals, and the described second decoupling zero device comprises second resistance with described second capacitances in series, be connected to described input and receive described right-channel signals, described first and second electric capacity are interconnected, and will be merged into described center channel signal through the left channel signals of decoupling zero with through the right-channel signals of decoupling zero.
23. one kind as in claim 22 the center channel decoding circuit of defined, also comprise the device of the amplitude of controlling described center channel signal, and described amplitude control unit comprises at least one variable resistor.
24. the center channel decoding circuit as defined in claim 23, wherein said at least one variable resistor comprises a variable resistor that is configured between described first and second electric capacity interconnection points and the described output.
25. the center channel decoding circuit as defined in claim 23, wherein said at least one variable resistor comprises that (a) is connected on first variable resistor between described first resistance and described first electric capacity; And (b) the second adjustable resistance that is connected between described second resistance and described second electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971824762A CN1139301C (en) | 1997-11-14 | 1997-11-14 | Post-amplification stereophonic to surround sound decoding circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971824762A CN1139301C (en) | 1997-11-14 | 1997-11-14 | Post-amplification stereophonic to surround sound decoding circuit |
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| CN1276959A true CN1276959A (en) | 2000-12-13 |
| CN1139301C CN1139301C (en) | 2004-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971824762A Expired - Fee Related CN1139301C (en) | 1997-11-14 | 1997-11-14 | Post-amplification stereophonic to surround sound decoding circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1139301C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8254612B2 (en) | 2007-12-21 | 2012-08-28 | Chi Mei Communication Systems, Inc. | Sound system for portable electronic device |
| CN108574873A (en) * | 2017-03-07 | 2018-09-25 | 汤姆逊许可公司 | Household audio and video system equipment |
-
1997
- 1997-11-14 CN CNB971824762A patent/CN1139301C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8254612B2 (en) | 2007-12-21 | 2012-08-28 | Chi Mei Communication Systems, Inc. | Sound system for portable electronic device |
| CN108574873A (en) * | 2017-03-07 | 2018-09-25 | 汤姆逊许可公司 | Household audio and video system equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1139301C (en) | 2004-02-18 |
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