CN2240222Y - Tabletop speaker having surrounding sound and karaoke function - Google Patents

Abstract

The utility model discloses a tabletop speaker having surrounding sound and karaoke functions, belonging to the application of the electronic technology. The interior of the tabletop speaker is provided with a surrounding sound resounding reverberation circuit and a microphone amplifier, and the high and low voice of the microphone can be realized by selecting two microphone spigots. The interior of the tabletop speaker adopts two circuit board combination devices, and all operating function keys are arranged at the back side of the tabletop speaker. When the tabletop speaker is matched and connected with a multimedia computer, a personal stereo sound-playing apparatus, a videorecorder having no karaoke function, a videoplayer having no karaoke function, a laser video disc player and a CD machine, an audio system with playback surrounding sound and karaoke functions is formed. The tabletop speaker having surrounding sound and karaoke functions can also be directly used as a small amplifier.

Description

Desktop type audio amplifier with surround sound and Kara OK function

The desktop type audio amplifier (hereinafter to be referred as around the OK audio amplifier) that the utlity model has surround sound and Kara OK function is the application that belongs to electronic technology.

Active audio amplifier that existing market is sold (audio amplifier that promptly has power amplifier and power supply) or multimedia loudspeaker box, all be by audio amplifier shell and power amplifier, power supply partly (exchanges or direct current) and loudspeaker are formed, they can only be for listening, the magnetic tape sound reproducer deck, CD player, multimedia computers etc. do not have power amplifier, the stereo set that does not have loudspeaker is as amplification of volume, and the sound amplifier of emitting sound with loudspeaker uses.These audio amplifiers all do not have playback surround sound and Kara OK function, can not make accompaniment music, song produce surround sound by them, can not insert microphone by them, more do not have microphone reverberation effect, promptly do not have Kara OK function." surrounding sound speaker " that sell in some market is actually audio amplifier shell and mediant trumpet and forms, and the inside does not have power amplifier, also do not have device to have to produce the echo delay circuit of reverberation of surround sound.The tone playing equipment that does not have the surround sound function is to produce the surround sound reverberation effect that echoes by this audio amplifier.This audio amplifier is the loudspeaker that are connected to surround sound equipment power amplifier output specially, plays surround sound specially, and title is called " surrounding sound speaker ".91 years, " three-in-one Karaoke active audio amplifier " that Guilin produces was by the microphone socket, the audio amplifier that microphone reverberation circuit, double-cassette recorder, three kinds of functions of high-fidelity power amplifier are integrated.Casing is a wooden flake board, and volume is equally big with console mode bedside cupboard, the small size safety cabinet of the thick iron of console mode.The belt handle is arranged at the casing top, and DC-AC two-use with No. 1 battery, can be mentioned open-air meadow and use, and two loudspeakers are arranged, one 8 inches bass horn, and all operations function key is entirely in the front of audio amplifier.It does not have playback surround sound function, and microphone reverberation function is only arranged.It is not stereosonic, because of 8 inches bass horns are only arranged.It can not lay out two on the table, when stereo desktop type active audio amplifier use (because of volume too big).In the market " Karaoke audio amplifier " more in fact is powerful active audio amplifier, as what produced in Bao'an, Shenzhen 2 * 60 watts power arranged.Other do not have power amplifier at all, and the loudspeaker of high, medium and low sound are only arranged, and they are to be specifically designed to sing karaoke, are used in Karaoke dancing hall, restaurant, the Karaoke box room, restaurant, and title is called " Karaoke audio amplifier ".These audio amplifiers do not have the microphone socket, do not have device to have to produce the echo delay circuit of reverberation of surround sound yet.

The utility model around the purpose of OK audio amplifier is: create a kind of desktop type active audio amplifier with playback surround sound and Kara OK function, specially and those do not have the surround sound acoustics, there is not the microphone socket, there is not microphone reverberation function, can not come the stereo set of sing karaoke to connect use with microphone, such as: walkman, minitape cassette player, compact radio cassette recorder, deck, CD player, the Laser disc machine that does not have surround sound and Kara OK function, record, player or the like.After connecting around OK audio amplifier and above-mentioned loom, just can form sound system, also can be used as multimedia loudspeaker box and use with playback surround sound and Kara OK function.Make multimedia computer possess surround sound and Kara OK function, also can directly be used as the small conference room sound amplifier separately and use.

The utility model takes following technique measures to realize around the OK audio amplifier:

1, the device surround sound Rev Delay circuit that echoes in around the OK audio amplifier, the generation of the generation of playback surround sound and microphone reverberation is finished by the surround sound Rev Delay circuit that echoes.

2, be provided with the surround sound switch around the OK audio amplifier, if the user does not temporarily need accompaniment music, song song to have when echoing effect, can turn off the surround sound function that echoes at any time, can play by former program, reverberation effect still keeps but microphone echoes.

3, be provided with two microphone sockets around the OK audio amplifier, and the microphone amplifier circuit.Economize and remove the high and low tone regulator potentiometer of microphone that general karaoke machine all has, the high bass of microphone is realized that by the selection of two microphone sockets promptly dividing has high pitch socket and bass socket.The input and output condenser capacity of the microphone preamplifier that is connect in the high pitch socket all than general, general conventional employed numerical value is little more than 4 times, it is shrill that amplification effect is that high pitch enriches, sound is bright and clear, clear, is fit to the Ms and uses.The input and output condenser capacity of the microphone preamplifier that is connect in the bass socket is all employed close with general normal conventional, bigger, and amplification effect is the plentiful deepness of bass, and sound is mellow and full, magnificent, is fit to the man and uses.

4, around in the OK audio amplifier, before power amplification, adding has the mega bass intensifier circuit, and the bass in the program source signal of input is got a promotion, and increases the weight of, thereby makes the acoustics bass of broadcast abundant, dull more.

5, in the general desktop type active audio amplifier all device power transformer or battery case are arranged, main components and parts all are assemblings, are welded on the bar printing wiring board.If increase surround sound and Kara OK function, more than the quantity of components and parts is equivalent to double,, be welded on the bar printing wiring board if all components and parts are still assembled, this has been an impossibility.The utility model has been taked the technical measures of two wiring boards around the OK audio amplifier, has just solved this problem.These technical measures are such: the left and right sound channels signal input socket, isolated amplifier, mega bass intensifier circuit, penetrate with amplifier, total tone regulator potentiometer, etc. resonant amount regulator potentiometer, power amplifier, rectification, filter circuit and relevant accessory circuit, assemble, be welded on the bar printing wiring board, this part wiring board in audio amplifier, horizontal device, fixing, welding faced downwards; Microphone socket, microphone amplifier, microphone volume control potentiometer, the surround sound Rev Delay circuit that echoes.The reverberation depth adjustment that echoes potentiometer, inverter, penetrate with amplifier and the assembling of relevant accessory circuit, be welded on the other bar printing wiring board.This other wiring board also is a horizontal device, fixing, but solder side is towards the top.The solder side of two wiring boards is relative, is not less than 6 millimeters at a distance of minimum range and gets final product.With 3-4 pillar they are fixed together between two wiring boards, make them keep spacing, pad is not collided, or produces dried scratching mutually, the separator that can also add sheet iron or Copper Foil ground connection in case of necessity between them.

6, on the inner cavity surface around the OK audio amplifier back side, design apparatus has perpendicular to the audio amplifier back side, the plastics bail of horizontal device and plastics pillar, and they are used for clip, supporting, fix two bar printing wiring boards.

7, around all functional key of OK audio amplifier: surround sound switch, mains switch, left and right sound track signals input socket, microphone socket, surround sound echo reverberation depth adjustment potentiometer, microphone volume control potentiometer, total tone regulator potentiometer, etc. resonant amount regulator potentiometer, external loudspeaker sockets etc., they all install the back side at audio amplifier.

8, around the little loudspeaker bore that is installed in the OK audio amplifier be 1 inch half to 2 inches anti-magnetic horn, also can not install little loudspeaker.The bass horn bore that is installed is 3 inches to 6 inch half an anti-magnetic horn.

9, in around the OK audio amplifier, can be by certain element circuit on the cancellation circuit board, the input/output terminal of certain element circuit of reconfiguration, promptly, the utility model is become: desktop type audio amplifier around the OK audio amplifier with quadraphony surround sound and Kara OK function by changing certain partly technical measures of the method for circuit connection.

Compare with common active audio amplifier, common active audio amplifier only can be done to enlarge playback and use, and can not produce surround sound, does not have microphone socket and microphone amplifier, does not have Kara OK function, and common active audio amplifier does not have demagnetizing effect, can not be in colour TV or the other use of computer colour display screen.Because common active audio amplifier does not have microphone socket and microphone amplifier, use so can not be used as the sound amplifier of small conference room separately.And the utility model is around the OK audio amplifier, not only can do to enlarge playback uses, can also produce surround sound, the surround sound function is arranged, the microphone socket is arranged, Kara OK function is arranged, adopt anti-magnetic horn around the OK audio amplifier, can be by colour TV, use on computer colour display screen next door, special and the walkman around the OK audio amplifier, magnetic tape sound reproducer, compact radio cassette recorder, deck, CD player and the early stage surround sound function that do not have, the big bottom function, the Laser disc machine of Kara OK function, video tape recorders etc. connect use, be combined into them and have surround sound, super (adding) supper bass, the sound system of Kara OK function improves the tonequality of early stage home audio greatly and increases function.As: connect to form with walkman and have surround sound, mega bass, Kara OK function head of a bed sound system.With the matched use of ordinary colour TV set, just can make ordinary colour TV set have surround sound, the mega bass acoustics makes the tonequality of TV programme graceful more.Can also use as multimedia loudspeaker box around the OK audio amplifier, play the VCD video disc for multimedia computer, sing karaoke most convenient is provided connects, and provides to have surround sound mega bass, the sound system of microphone Karaoke.As long as mix microphone, just can be individually use as the sound amplifier of small conference room around the OK audio amplifier.This sound amplifier volume is little, and pendulum does not account for a lot of places on conference table, uses easily.

With general surround sound reverberation processor, or surround sound equipment compares, general surround sound reverberation processor or equipment, and volume is bigger, they have not worn audio amplifier, will choose 2-4 audio amplifier voluntarily in addition, and the utility model is that " loom or equipment " is combined as a whole with audio amplifier around the OK audio amplifier, easy to use, volume is small and exquisite, be fit to put in desktop bookshelf, or pillow both sides.All desktop type multimedia loudspeaker boxes do not have surround sound and Kara OK function at present, so the multimedia computer that is particularly suitable on the desktop around the OK audio amplifier connects use.

The utility model has following accompanying drawing around the OK audio amplifier:

Fig. 1 is around OK audio amplifier electrical schematic diagram.

Fig. 2 quadraphony surround sound, left audio amplifier electrical schematic diagram.

Fig. 3 quadraphony surround sound, right-hand audio amplifier electrical schematic diagram.

Fig. 4 penetrates with amplifier, isolated amplifier, and inverter is implemented circuit diagram.

Fig. 5 mega bass intensifier circuit is implemented circuit diagram.

Fig. 6 power amplifier is implemented circuit diagram.

Fig. 7 BBD type surround sound Rev Delay circuit that echoes is implemented circuit diagram.

Fig. 8 numeric type surround sound Rev Delay circuit that echoes is implemented circuit diagram.

Fig. 9 microphone amplifier is implemented circuit diagram.

Figure 10 two bar printing wiring boards are at the embodiment around OK audio amplifier inner fixing device.

Figure 11 is around the OK audio amplifier back side all operations function key embodiment that arranges.

Below in conjunction with accompanying drawing the utility model is done around operation principle, the structure of OK audio amplifier Describe in detail.

Fig. 1 be the utility model around the circuit theory diagrams of OK audio amplifier, L, R are left and right sound The road signal input socket. R1 and R2, R3 and R4 are the decay electricity of left and right sound track signals input The road. 1, the 5th, Mega bass boosting circuit. 2,6,13,14 be to penetrate with amplifier. W1 and w3 are total tone regulator potentiometers. W2 and w4 are volume control potentiometers. 3, the 7th, The left and right acoustic channels power amplifier. The 4th, the L channel loudspeaker. The 8th, R channel loudspeaker socket. 9 and 10 is isolated amplifiers. K1 is playback surround sound switch. 11 with w5 be mixed around echoing Ring delay circuit, w5 is the surround sound reverberation depth adjustment potentiometer that echoes, and A, B are surround sounds The echo input of Rev Delay circuit, output. The 12nd, phase inverter. J1, J2 are that microphone is inserted Mouthful. 15,16,17,18 and W6 be the microphone amplifier circuit, F is output. W6 is words The tube volume control potentiometer. K2 is power switch. The 19th, power transformer, rectification, filter Wave circuit or a battery case. C1, C2, C3, R5 and C4, C5, C6, R6 branch It not the resistor-capacitor of the resonant amount regulating networks such as left and right sound channels tone. C9, C10 and C11, C12 are respectively the inputs of J1, J2 microphone preamplifier, output capacitor, C7, R7 and C8, R8 are the not resistance capacitances of the two-way output of level amplifier of microphone.

Course of work principle around the OK audio amplifier is such:

Left channel signals is sent into from L, and one the tunnel directly strengthens through 1 bass after R1, R2 decay After, send into emitter follower 2, after W2 sends into power amplifier 3, broadcast another road warp by loudspeaker 4 again After 9 isolation are amplified, converge after 10 isolation are amplified with the signal of R channel, through the K1 closure Sending into surround sound echoes after the delayed processing of Rev Delay circuit input end A to send into from the B end and penetrates Also broadcasted by loudspeaker 4 with sending into power amplifier 3 behind the device 13. In the L channel loudspeaker, broadcast like this Be: the main sound that L channel is not delayed and the same-phase after the delayed processing of left and right sound channels The reverberation sound that echoes.

Right-channel signals is sent into from R, and after R3, R4 decay: the one tunnel directly strengthens through 5 basses After, send into emitter follower 6, again after W6 sends into power amplifier 7, through R channel loudspeaker socket 8, by outside The R channel loudspeaker that connect broadcast. Another road is after 10 isolation are amplified, with the signal warp of L channel Converge together after 9 isolation are amplified, it is defeated to send into the surround sound Rev Delay circuit that echoes through the K1 closure Enter to hold A, send into phase inverter B from the B end after the delayed processing, after the antiphase, through emitter follower Send into power amplifier 7 after 14, behind loudspeaker socket 8, also broadcasted by external R channel loudspeaker, like this What broadcast in the R channel loudspeaker is: main sound and left and right sound channels that R channel is not delayed The reverberation sound that echoes of the antiphase after the delayed processing. Left and right two sound channel loudspeaker broadcast Sound just consisted of the playback surround sound.

Microphone sound through socket J1 or J2 send into by C9, C10, C11, C12,15,16, 17,18, the microphone amplifier circuit that forms such as W6, by not level amplifier 18 outputs: one Emitter follower 13 is sent into directly through C8, R8 in the road, reaches phase inverter 12, emitter follower 14 rear respectively warps After power amplifier 3,7 amplifies, in the left and right sound channels loudspeaker, broadcast homophase microphone sound and anti-phase microphone Sound. Another road is sent into surround sound through C7, R7 and is echoed the A end of Rev Delay circuit through echoing After processing, Rev Delay by the output of B end, amplifies by power amplifier 3,7 through 13 and 12,14 equally After, in the left and right sound channels loudspeaker, broadcast the synchronous reverberation sound that echoes, reach returning of antiphase Ring reverberation sound, the like this microphone sound that the broadcasts reverberation of echoing exactly in the left and right sound channels loudspeaker Sound is the peculiar microphone sound of Karaoke, i.e. Kara OK function.

When the user does not need the playback surround sound, can turn off K1, surround sound is eliminated, can be by former Program is play, but the reverberation effect that echoes of microphone still keeps.

The utility model around the audio amplifier shell of the R channel external loudspeaker of OK audio amplifier is and left sound Road audio amplifier shell is the same, partners, but the circuit of installation drawing 1 not in the R channel audio amplifier, Loudspeaker are only arranged. Can certainly be: press Fig. 1, the cancellation 5,6,7,8,12,14, W3, The circuit powers such as W4 19 change battery case into, and other are constant, form the L channel audio amplifier, press Fig. 1, get Disappear 1,2,3,4,13, the circuit such as W1, W2, power supply 19 changes battery case into, socket 8 changes into Loudspeaker, other are constant, and are assembled into the R channel audio amplifier, and so left and right audio amplifier also can become Around the OK audio amplifier.

The utility model is around the loudspeaker 4 in the OK audio amplifier, or external R channel loudspeaker are by height Sound and bass horn form. Loudspeaker is to adopt 1 inch half to 2 inches antimagnetic loudspeaker , also can not install loudspeaker. Bass horn is the anti-of 3 inches to 6 inch half of employings Magnetic horn. Adopting anti-magnetic horn is to use in order to adopt aobvious next door at colour TV, computer.

According to Fig. 1 schematic diagram, when Mega bass boosting circuit (1) cancellation, penetrate with amplifier (2) input reconfiguration is penetrated with amplification simultaneously to the output of Mega bass boosting circuit (5) Device (13) cancellation, other circuit are constant, as shown in Figure 2, as press Fig. 2 principle and implement, and at this moment should Audio amplifier becomes right-hand (R) of quadraphonic surround sound: the audio amplifier of forward and backward two sound channels, right front channels (R master's sound) is broadcasted by loudspeaker (4), is the sound of original pure R channel in the right front channels, does not have Any reverberation of echoing. Right back sound channel (sound behind the R) is by loudspeaker socket (8), by another external loudspeaker (passive loudspeaker box) broadcast. The sound and the left and right sound that include R channel in the right back sound channel The sound of the antiphase of road after the Rev Delay of echoing is processed. Work as Mega bass boosting circuit (5) cancellation is penetrated with the input reconfiguration of amplifier (6) to Mega bass boosting circuit (1) Output, phase inverter (12) is penetrated with amplifier (14) cancellation, and is penetrated with amplifier simultaneously (13) output reconfiguration is to the output of penetrating with amplifier (6), and other circuit are constant, such as figure Shown in 3, as press Fig. 3 principle and implement, at this moment this audio amplifier becomes the left of quadraphonic surround sound (L): the audio amplifier of forward and backward two sound channels, left front sound channel (L master's sound) is broadcasted by loudspeaker (4), and is left front The sound of original pure L channel in the sound channel, without any the reverberation of echoing. Left back sound channel (sound behind the L) by loudspeaker socket (8), is broadcasted by another external loudspeaker (passive loudspeaker box). Left back Include the sound of L channel and left and right sound channels in the sound channel after the Rev Delay of echoing is processed The sound of positive phase. The audio amplifier of above-mentioned two kinds of reconfiguration modes (namely pressing Fig. 2, Fig. 3 implements), Just can be combined into: the tabletop speaker with quadraphonic surround sound and Kara OK function.

Surround sound has diversified pattern: A is arranged around around (namely being with image) master being arranged with AV Dynamic formula, passive type have delayed type and non-delayed type (the Rev Delay circuit that echoes not to be housed namely ), two-channel is arranged, triple-track four loudspeaker (Dolby Surround) and the quadraphonic are arranged to six sound channels Deng. According to Fig. 1 principle, be the analog surround sound in two-channel hall, make up according to Fig. 2, Fig. 3 Be quadrix hall formula surround sound. If the isolation among Fig. 1, Fig. 2, Fig. 3 Increase a phase inverter before the input of amplifier (10), so just can obtain other moulds The surrounding sound effect of formula, whether the adding of this phase inverter to be, can realize by a switch, And this switch can become the surround sound mode conversion switch.

The utility model is around the embodiment of OK audio amplifier

In the middle of Fig. 1, Fig. 2, Fig. 3, each components and parts, each element circuit are all corresponding identical, the only input of certain several element circuit, some change of output wiring.The operation principle of each element circuit all is the same among them.Promptly in the middle of Fig. 1, Fig. 2, Fig. 3, all mark marks are identical, and function is identical, just use identical components and parts or identical circuit to implement.

In the middle of Fig. 1, Fig. 2, Fig. 3: resistance R 1, R3 use 3K3, and R2, R4 use 1K, and R5, R6 use 2K, R7 15K, R8 100K.Capacitor C1, C4 are with the ceramic disc capacitor of 0.015 microfarad, C2, C5 3300P ceramic disc capacitor, C3, C6 be with 0.15 microfarad terylen electric capacity, and with 0.1 microfarad ceramic disc capacitor, C12 is with 0.47 microfarad electrolytic capacitor with 0.01 microfarad ceramic disc capacitor C10, C11 for C7, C8, C9.W1 and W3 duplex 51K potentiometer, W2, W4 are with centre tapped potentiometer with 50K, W5 100K potentiometer, W6 50K potentiometer, K1, K2 use 2 retaining push button switches, (8) be to use common lotus flower loudspeaker socket, J1, J2 use diameter is 6.5 millimeters a horizontal microphone socket, and L, R use the monophony socket of 3.5 millimeters of diameters.Loudspeaker (4) or be to use the antimagnetic loudspeaker in 1 inch half 1 watts of 4 Europe, and use in parallel with bass horn behind the nonpolarity electrochemical capacitor of one 4.7 microfarad of antimagnetic bass horn loudspeaker series connection in 5 inches 3 watts of 4 Europe by (8) external loudspeaker.Power supply (19) is that voltage is 12 volts after rectification, the filtering.(15), microphone amplifier is formed in (16), (17), (18).Pressing Fig. 9 implements.(9), (10) press Fig. 4 a and implement, (12) press Fig. 4 b enforcement.(2), Fig. 4 c enforcement is pressed in (6), (13), (14).(1), (5) press Fig. 5 enforcement.(3), (7) press Fig. 6 enforcement.(11) form the surround sound Rev Delay circuit that echoes with W5.It can be to adopt BBD type delay circuit, also can adopt the numeric type delay circuit, can implement by Fig. 7 or Fig. 8, and present embodiment is pressed Fig. 7 and implemented.

Desktop type audio amplifier with dual track surround sound and Kara OK function is implemented by Fig. 1 principle and above-mentioned explanation.Desktop type audio amplifier with quadraphony surround sound and Kara OK function is pressed principle and the above-mentioned explanation of Fig. 2 and Fig. 3 and is implemented.

The utility model has a large amount of introductions around operation principle, process, implementation detail, the method for maintaining/experience of each element circuit among OK audio amplifier Fig. 1, Fig. 2, Fig. 3 on various newpapers and periodicals, magazine, books, they all are prior aries.So be not described with regard to the principle of work and power to each element circuit not here, because book size is too little, so also do not provide specifically, detail circuits is always schemed.But Fig. 4 to Fig. 9 has been concrete, detailed embodiment.The device embodiment of two bar printing wiring boards is by the 5th, the 6th and Figure 10 and explanation enforcement in the technical measures.

Arranging of the functional key at the audio amplifier back side pressed Figure 11 and implemented.

In the middle of label symbol in the middle of Figure 10 and Fig. 1 is the same, and the function manipulation key of representative is the same, and two dotted lines are represented two bar printing wiring boards in audio amplifier among the figure.(ratio: 1: 1) L, R, W1, W3, W2, W4 packaging level are welded on the top bar printing wiring board, the welding faced downwards.W5, J1, J2, W6, K1, K2, (8) external loudspeaker socket are dress bond pads below on the bar printing wiring board, and solder side is towards the top.Two wiring board spacings are 10 millimeters.

In the middle of Figure 11: 1 is the inner cavity surface at the audio amplifier back side, and 2 is the plastics bail, and 3 is the plastics pillar, and 4 is electronic devices and components, and 5 is pillar, 6 wiring boards for the welding faced downwards.7 is the wiring board of solder side towards the top, and 8 is the solder side of wiring board, and plastics bail 8-10 is right around having in the OK audio amplifier, diameter 2-3 millimeter, bail spacing 1.6-1.8 millimeter, long 8-10 millimeter.The plastics pillar of horizontal device has 4,6 millimeters of diameters, and length 50-60 millimeter, there is the hole of 2,5 millimeters of diameters at the pillar center, is used for fixedly gong nail.

Claims (10)

1, a kind of power amplifier that has, loudspeaker are arranged, desktop type audio amplifier with surround sound and Kara OK function, it is characterized in that: device has the surround sound Rev Delay circuit that echoes in this audio amplifier, device has two microphone sockets and microphone amplifier circuit, the input of a microphone preamplifier is wherein arranged, the capacity numeric ratio of output capacitor is general, the common numerical value that is often adopted is little more than 4 times, the height of microphone, bass can be selected to realize by two microphone sockets, in this audio amplifier: power amplifier circuit, penetrate with amplifier circuit, the mega bass intensifier circuit, the isolated amplifier circuit, rectification, filter circuit with and relevant accessory circuit be the assembling, be welded on the bar printing wiring board: Rev Delay circuit and microphone socket and surround sound echoes, the microphone amplifier circuit, penetrate with amplifier circuit, inverter circuit with and relevant accessory circuit be the assembling, be welded on the other bar printing wiring board.

2, described by claim 1, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: the playback surround sound of this audio amplifier echo Rev Delay circuit and microphone Rev Delay circuit be shared one by (11) and the surround sound of (W5) the being formed Rev Delay circuit that echoes: its input (A) is connected to the output of isolated amplifier (9) and (10) through (K1), its output (B) joins with the input of penetrating with amplifier (13), join with the input of inverter (12), and microphone not the level amplifier (18) output (F), one the tunnel through (C7), (R7) be connected to (A) end, another road is through (C8), (R8) be connected to (B) end.

3, described by claim 1, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: the capability value of the input capacitor (C9) of microphone preamplifier (15) is chosen between 0.01 microfarad to 0.1 microfarad, and the capability value of its output capacitor (C10) is chosen between 0.1 microfarad to 0.33 microfarad.

4, described by claim 1, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: the mega bass intensifier circuit (1) in this audio amplifier and the input of (5) join with resistance (R3), (R4) respectively, and the output of (1) and (5) joins with the input of penetrating with amplifier (2) and (6) respectively.

5, described by claim 1, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: in audio amplifier, a left side, right-channel signals input socket (L), (R), isolated amplifier (9), (10), mega bass intensifier circuit (1), (5), penetrate with amplifier (2), (6), total tone regulator potentiometer (W1), (W3), Deng resonant amount regulator potentiometer (W2), (W4), power amplifier (3), (7), rectification, filter circuit (19) and relevant accessory circuit element are assemblings, be welded on the printed circuit board, and microphone socket (J1), (J2), microphone amplifier (15), (16), (17), (18), microphone volume control potentiometer (W6), echo Rev Delay circuit (11) and (W5) of surround sound, inverter (12), penetrate with amplifier (13), (14) and relevant accessory circuit element be the assembling, be welded on the other bar printing wiring board.

6, described by claim 5, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: described two bar printing wiring boards are that horizontal device is in audio amplifier, a block welding faced downwards wherein, another block welding faces the top, solder side is relative, two bar printing wiring board solders side are not less than 6 millimeters at a distance of minimum range, with 3-4 pillar they are fixed together between the two bar printing wiring boards, make them keep spacing, pad is not collided, or produces dried scratching mutually.

7, described by claim 1, have the desktop type audio amplifier of surround sound and Kara OK function, it is further characterized in that: on the inner cavity surface at this audio amplifier back side, have perpendicular to the audio amplifier back side, the plastics pillar of horizontal device and plastics bail are used for clip, two bar printing wiring boards are fixed in supporting.

8, described by claim 1, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: the functional key of this audio amplifier: playback surround sound switch (K1), mains switch (K2), a left side, right-channel signals input socket (L), (R), microphone socket (J1), (J2), the surround sound reverberation depth adjustment potentiometer (W5) that echoes, microphone volume control potentiometer (W6), total tone regulator potentiometer (W1), resonant amount regulator potentiometer (W2) such as (W3), (W4), R channel external loudspeaker sockets (8) etc., they all install the back side at audio amplifier.

9, described by claim 1, desktop type audio amplifier with surround sound and Kara OK function, it is further characterized in that: the bore of the little loudspeaker that is installed in this audio amplifier is 1 inch half or 2 inch an anti-magnetic horn, perhaps do not install little loudspeaker, the bass horn bore that is installed is 3 inches to 6 inch half an anti-magnetic horn.

10, described by claim 1, desktop type audio amplifier with surround sound and Karaoke energy, it is further characterized in that: in this audio amplifier, when mega bass intensifier circuit (1) cancellation, penetrate with the input reconfiguration of amplifier (2) output to mega bass intensifier circuit (5), penetrate simultaneously with amplifier (13) and cancel, other circuit are constant, at this moment this audio amplifier becomes right-hand (R) of quadraphony surround sound: preceding, the audio amplifier of back two sound channels, when mega bass intensifier circuit (5) cancellation, penetrate with the input reconfiguration of amplifier (6) output to mega bass intensifier circuit (1), while inverter (12), penetrate with amplifier (14) and cancel, and penetrate output reconfiguration with amplifier (13) to the output of penetrating with amplifier (6), other circuit are constant, at this moment this audio amplifier becomes the left (L) of quadraphony surrounding sound speaker: preceding, the audio amplifier of back two sound channels, the audio amplifier of above-mentioned two kinds of reconfiguration modes just can be combined into: the desktop type audio amplifier with quadraphony surround sound and Kara OK function.

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