CN2239114Y

CN2239114Y - Motion feedback phase-inversion active speaker

Info

Publication number: CN2239114Y
Application number: CN 94238977
Authority: CN
Inventors: 徐耀忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-06-30
Filing date: 1994-06-30
Publication date: 1996-10-30
Anticipated expiration: 2004-06-30

Abstract

The utility model relates to a motion feedback phase-inversion type sound box which is composed of a box body 2, a loudspeaker 3, a power switch 4, a volume switch 5, a bass extension keystroke 6, a power transformer 7, an element printed board 8, a power socket 9, a fuse seat 10, a radiator 11, a right path audio socket 12 and a left path audio socket 13, wherein, the box body 2 is an ultra-phase-inversion type box body or an ultra-passive radiation type box body, and the element printed board 8 comprises a frequency compensation circuit, a motion feedback circuit, a power amplification circuit and a protective circuit; the loudspeaker 3 is treated as a speed governing system-executive element. The utility model adopts a communal voice coil frame and a double-magnetic path and double-voice coil structure, changes the traditional approach of sound box design and synthesizes the advantages of a phase-inversion type sound box and a multi-chamber effect ultra-low voice sound box, and therefore, the utility model has the advantages of small volume of the box body, small playing distortion and wide working frequency range.

Description

A kind of motion feedback inverted phase type active audio amplifier

The utility model belongs to household electrical appliance, particularly the advanced audio technology.

The playback that reduces audio amplifier Yang Sheng device with the motion feedback method distorts, and seeks f.Damping and the theory of frequency characteristic straightened gain public acceptance in the sound technique field.But in practical application, particularly on commercialized degree, also there are not substantive breakthroughs up to now.Japan AIWA company releases commercial audiofeedback system audio amplifier, though this audio amplifier volume is little, wherein bass is abundant, and sound is soft naturally, and the sense of hearing is good, and the road of a practicality has been walked out in its birth for the reproducing characteristics that improves small-sized audio amplifier.But the acoustic feedback sound system is quite high to the requirement of the microphone of acoustic feedback sampling and loud speaker, makes the domestic consumer be difficult to bear on price.For this reason, many knowledgeable people make great efforts to explore are being fit to China's actual conditions, and the technical scheme of international most advanced level is arranged.

The purpose of this utility model is exactly to provide a kind of advanced person and the practical super inverted phase type active audio amplifier of motion feedback to society.

The utility model improves on prior art, and technical have three breakthroughs.First, sound box is super inverted phase type, combine the advantage of phase inverted cabinet and the ultralow audio amplifier of multicell effect in the design, compare with phase inverted cabinet, increased the length of phase-reversing tube (device), corresponding phase-reversing tube (device) sectional area that increased, the frequency of oscillation of super phase-reversing tube (device) is 0.5-0.8 of a conventional phase inverter, audio amplifier low frequency lower end operating frequency expands to about 50% than pipe volume inverted phase type, has improved the Subwoofer Loudspeaker System effect of audio amplifier greatly.The second, loadspeaker structure has desirable speed sampling performance, comprises linearity and phase place.Loudspeaker voice coil is used as the governing system executive component, and when speaker operation during in not too high frequency, cone is consistent with the voice coil loudspeaker voice coil motion; Power amplifier is arranged in the system, the signal of input is carried out power amplification, the loud speaker that has velocity coils is delivered in its output.For making loud speaker and audio amplifier matching effect the best, designed the frequency compensated circuit of forming by low pass circuit and L.C circuit.Low pass circuit is to extend audio amplifier ultralow frequency playback scope, and the L.C circuit is with the acoustical power valley point between compensation paraphase frequency of oscillation and the loud speaker frequency of oscillation.The 3rd, designed unique power amplifier protective circuit, when power tube is negative disconnect resistance, loudspeaker impedance diminishes or during short circuit, with short-circuit power pipe bias method, prevent the unusual increase of power tube power consumption, protects the power tube trouble free service.The utility model is to realize like this, the super inverted phase type active audio amplifier of a kind of motion feedback, by casing 2, the woofer 3 of band velocity coils, mains switch 4, volume switch 5, bass extends button 6, power transformer 7, element printing forme 8, supply socket 9, fuse holder 10, radiator 11, right wing audio socket 12, left road audio socket 13 is formed, it is characterized in that casing 2 is super inverted phase types, the length overlength of phase-reversing tube (device) 1, the corresponding increase of sectional area, frequency of oscillation is 0.5-0.8 of a conventional equal-volume audio amplifier phase inverter; Element printing forme 8 comprises frequency compensation, moving feedback, power amplifier and protective circuit; Loud speaker 3 is governing system one executive components, adopts public sound ring frame, and the double magnetic loop structure realizes double-tone circle motion feedback.

Realization of the present utility model makes the motion feedback method obtain first application in the sound equipment practice, has changed traditional audio amplifier mentality of designing, has reached desirable hi-fi effect.Be a kind of technical characteristics that have, high reliability qualitatively, technology is reasonable, and the advanced audio technology that the commercialization future is good possesses advantages such as reasonable in design, that cost is low, efficient is high, tonequality is good simultaneously.

Accompanying drawing 1 is a schematic diagram of the present utility model.

Accompanying drawing 2 is block diagrams of the present utility model.

Accompanying drawing 3 is electrical schematic diagrams of the present utility model.

Accompanying drawing 4 is that moving feedback of the present utility model is implemented illustration.

Accompanying drawing 5 is that power amplifier protective circuit of the present utility model is implemented illustration.

Accompanying drawing 6 is that loud speaker of the present utility model is implemented illustration.

Accompanying drawing 7 is output characteristic schematic diagrames of the present utility model.

Accompanying drawing 8 is that the another kind of form of the utility model is implemented illustration.

Among the figure: 1, phase-reversing tube (device), 2 casings, the loud speaker of 3 band velocity coilses, 4 mains switches, 5 volume switches, 6 basses extend button, 7 power transformers, 8 element printing formes, 9 supply sockets, 10 fuse holders, 11 radiators, 12,13 right sides, left side road audio socket, 14 vibrating diaphragms, 15 dust covers, 16 non-magnetic conduction linkage frames, 17, velocity coils, 18 centring disks, 19 rings, 20, magnet, 21, pole plate, 22 pores, 23 magnetic conductors, 24 voice coil loudspeaker voice coils, 25 speech coil frameworks, 26 basin framves, 27 magnetic conductor bowls, 28 velocity measurement mechanisms pole plates, 29 velocity measurement mechanisms magnets, 30 magnetic induction rings, magnet ring magnetizes inside and outside 31,32 non-magnetic conduction links, 33 passive radiators, the square output response of 34 loud speakers, 35L.C compensating action, 36 surpass phase-reversing tube (device) output response, 37 audio amplifiers output response.

Followingly further narrate the technical solution of the utility model with reference to accompanying drawing.

With reference to accompanying drawing 1-3, the utility model is with the woofer 3 of velocity coils by casing 2, mains switch 4, volume switch 5, bass extends button 6, power transformer 7, element printing forme 8, supply socket 9, fuse holder 10, radiator 11, right wing audio socket 12, left side road audio socket 13 is formed, and it is characterized in that casing 2 is super inverted phase types, phase-reversing tube (device) length overlength, the corresponding increase of phase-reversing tube sectional area, frequency of oscillation are 0.5-0.8 of conventional design; Element printing forme 8 comprises frequency compensation, moving feedback, power amplifier and protective circuit; Loud speaker 3 is governing system one executive components, adopts public sound ring frame, double magnetic loop double-tone coil structures.With reference to accompanying

drawing

1 and 8, casing 2 has two embodiments, is both super phase inverted cabinet and can makes among Fig. 11 form to phase-reversing tube (device), can also make among Fig. 8 33 shape.With reference to accompanying drawing 6, loud speaker 3 also has two kinds of embodiments, and magnet ring and 32 non-magnetic conduction links are formed by magnetizing inside and outside 14 vibrating diaphragms, 15 dust covers, 17, velocity coils, 18 centring disks, 19 rings, 20, magnet, 21, pole plate, 22 pores, 23 magnetic conductors, 24 voice coil loudspeaker voice coils, 25 speech coil frameworks, 26 basin framves, the 30 magnetic induction rings, 31; Or formed by 14 vibrating diaphragms, 15 dust covers, 16 non-magnetic conduction connecting pieces, 17, velocity coils, 18 centring disks, 19 rings, 20 magnets, 21 pole plates, 22 pores, 23 magnetic conductors, 24 voice coil loudspeaker voice coils, 25 speech coil frameworks, 26 basin framves, 27 magnetic conductor bowls, 28, velocity measurement mechanisms pole plate, 29, velocity measurement mechanisms magnet.Because the utility model adopts the speed feedback loud speaker, has good servo performance, distortion is little, thrust is big, do not have tangible covibration, therefore, make that the frequency of oscillation of audio amplifier paraphase mouth is selected a very big degree of freedom, the resonance frequency of paraphase mouth is further descended, the design of super phase inverted cabinet is come true.Because loud speaker is a velocity profile device, (the E=RV that square is directly proportional of the sounding acoustical power of arbitrary loud speaker pelvic surface of sacrum and its acoustic resistance and pelvic surface of sacrum vibration velocity ²) E is an acoustical power in the formula, R is an acoustic resistance, V is a vibration velocity.Therefore, the linear relationship that improves sound amplifier input voltage and the vibration velocity of diffuser in lower operating frequency is the key of raising sound system tonequality, and the functional relation of loud speaker acoustic resistance and frequency is to be resolved with frequency compensated circuit than being easier to.With reference to accompanying

drawing

2,3,6, the utility model is used as the governing system executive component to loud speaker 3 and is handled, when loud speaker 3 is operated in not too high frequency, cone is consistent with the voice coil loudspeaker voice coil motion, power amplifier is arranged in the system, the signal of input is carried out power amplification, its output is delivered on the loud speaker 3 that has velocity coils, velocity coils 17 output voltages of loud speaker 3 are connected on the input of power amplifier, finished the motion feedback of system, referring to accompanying drawing 4 motion feedback two kinds of embodiments are arranged, a kind of is by IC3, L2, L3, L4, V13, V14, R19, R20, D, D1, D2, and F, F1, F2, form, another program is by IC4, IC5, IC14, R21, R22, R23, D, D1, D2, and F, F1, F2, form.Because the acoustic resistance of loud speaker 3 radiation, the vibration of sound box inverted tube (device) and radiation acoustic resistance are all relevant with operating frequency, so native system has increased frequency compensated circuit, with reference to accompanying

drawing

2,3, frequency compensated circuit is made up of integrating circuit and L.C circuit, the former is in order to extend the ultralow frequency scope of audio amplifier, the latter is in order to the acoustical power valley point between compensation phase-reversing tube (device) frequency of oscillation and the loud speaker frequency of oscillation, make output characteristic of the present utility model reach perfect requirement, output characteristic is referring to accompanying drawing 7, the square output response of 34 loud speakers, 35L.C compensating action 36 surpasses phase-reversing tube (device) output response, 37 audio amplifiers output response.Power amplifier of the present utility model has designed characteristic protective circuit; with reference to accompanying drawing 5; the power amplifier protective circuit has two kinds of embodiments; a kind of is by V7, V8, V9, C11, W4, R14, R15, RL; form, also can be formed by V10, V11, V12, C12, W5, R16, R17, R18, RL.Cut when unusual when amplifier is negative, the normal bias voltage of short-circuit power pipe makes the power tube power consumption can supernormal growth, the trouble free service of protection power tube.With reference to accompanying drawing 3, the utility model power amplifier adopts the Vmos pipe, forms bias voltage temperature compensation common source configuration amplifier by B, R10, W2, C7, V1, R12 and V5.

Claims

1, a kind of motion feedback inverted phase type active audio amplifier, by casing 2, the woofer 3 of band velocity coils, mains switch 4, volume switch 5, bass extend by strong 6, power transformer 7, element printing forme 8, supply socket 9, fuse holder 10, radiator 11, right wing audio socket 12, left road audio socket 13 is formed, and it is characterized in that:

A, casing 2 are super inverted phase types, phase-reversing tube (device) 1 length overlength, and the corresponding increase of phase-reversing tube sectional area, frequency of oscillation is the 0.5-0.8 of conventional equal-volume audio amplifier;

B. element printing forme 8 comprises frequency compensation, motion feedback, power amplifier and protective circuit;

C. loud speaker 3 adopts public speech coil framework, double magnetic loop double-tone coil structures.

2, a kind of motion feedback inverted phase type active audio amplifier according to claim 1 is characterized in that described casing 2 is made up of 1 phase-reversing tube (device), 4 mains switches, 5 volume switches, 6 basses extension button, 7 power transformers, 8 element printing formes, 9 supply sockets, 10 fuse holders, 11 radiators, 12,13 right sides, left road audio socket; Or stretch button, 7 power transformers, 8 element printing formes, 9 supply sockets, 10 fuse holders, 11 radiators, 12,13 right sides, left road audio socket by 33 passive radiators, 4 mains switches, 5 volume switches, the 6 bass courts of a feudal ruler and formed.

3, a kind of motion feedback inverted phase type active audio amplifier according to claim 1, it is characterized in that described frequency compensated circuit comprises low pass circuit and L, C circuit, to extend the acoustical power valley point between ultralow frequency playback scope and compensation paraphase frequency of oscillation and the loud speaker frequency of oscillation.

4, a kind of motion feedback inverted phase type active audio amplifier according to claim 1 is characterized in that described motion feedback circuit is made up of IC3, L2, L3, L4, V13, V14, R19, R20, D and F; Or form by IC4, IC5, IC14, R21, R22, R23, D and F.

5, a kind of motion feedback inverted phase type active audio amplifier according to claim 1 is characterized in that described power amplifier adopts the VMOS pipe, forms bias voltage temperature compensation common source configuration amplifier by B, R10, W2, C7, V1, R12 and V5.

6, a kind of motion feedback inverted phase type active audio amplifier according to claim 1 is characterized in that described power amplifier protective circuit is made up of V7, V8, V9, C11, W4, R14, R15, RL; Also can be formed by V10, V11, V12, C12, W5, R16, R17, R18, RL.

7, a kind of motion feedback inverted phase type active audio amplifier according to claim 1 is characterized in that described loud speaker 3 is made up of magnetize inside and outside 14 vibrating diaphragms, 15 dust covers, 17 velocity coilses, 18 centring disks, 19 rings, 20 magnets, 21 pole plates, 22 pores, 23 magnetic conductors, 24 voice coil loudspeaker voice coils, 25 speech coil frameworks, 26 basin framves, the 30 magnetic induction rings, 31 magnet ring and 32 non-magnetic conduction links; Or formed by 14 vibrating diaphragms, 15 dust covers, 16 non-magnetic conduction connecting pieces, 17 velocity coilses, 18 centring disks, 19 rings, 20 magnets, 21 pole plates, 22 pores, 23 magnetic conductors, 24 voice coil loudspeaker voice coils, 25 speech coil frameworks, 26 basin framves, 27 magnetic conductor bowls, 28 velocity measurement mechanisms pole plates, 29 velocity measurement mechanisms magnets.