CN2281621Y - Super high-fine audio play-back device - Google Patents
Super high-fine audio play-back device Download PDFInfo
- Publication number
- CN2281621Y CN2281621Y CN 96213270 CN96213270U CN2281621Y CN 2281621 Y CN2281621 Y CN 2281621Y CN 96213270 CN96213270 CN 96213270 CN 96213270 U CN96213270 U CN 96213270U CN 2281621 Y CN2281621 Y CN 2281621Y
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- resistance
- sound
- amplifier
- current
- power amplifier
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- Expired - Fee Related
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Abstract
The utility model relates to the improvement of a sound system, particularly a super high-fine audio play-back device. A power amplifier preceding stage circuit of the existing sound system is not changed. A voltage negative feedback network of a final stage power amplifier of the existing sound system is changed to a current negative feedback network to realize that the phase distortion of the reductive sound is zero. The circuit of the utility model is compact, can reduce cost and improve the performances, which is an optimal path for realizing the high-fidelity sound reduction.
Description
The utility model relates to a kind of improvement of sound system, particularly a kind of super fidelity sound-reducing device.
The design of existing playback system is the separately design of power amplifier and loudspeaker, so be difficult to the two efficiently, work good accurately.Be in particular in: high-quality power amplifier just internal resistance do very little, the voltage amplification distortion is minimum, comprises linear distortion and nonlinear distortion.But the capacitance-resistance characteristic of loudspeaker is a very complicated equation, and the cooperation between them be difficult to guarantee, has both made the minimum sound that is difficult to also to guarantee that loud speaker sends of the voltage distortion that is added on the loud speaker undistorted.At first analyze from loudspeaker, main distortion reason is the applied voltage of loud speaker, the interaction between the induced electromotive force that produces with voice coil loudspeaker voice coil motion and the capacitance-resistance characteristic of voice coil loudspeaker voice coil.The cone of loud speaker begins vibrations under the current drives of voice coil loudspeaker voice coil, the motion of voice coil loudspeaker voice coil in magnetic field produces induced electromotive force, and direction is identical with the voltage direction that is added on the loud speaker, has so just offset a part of voltage signal, electric current in the voice coil loudspeaker voice coil also descends thereupon, and the motion of cone is restricted.But its motion is the variation that will lag behind voltage, and just cone can not be followed the variation of signal voltage at once and move in the time of the external signal voltage jump, and this has just produced phase distortion.On the other hand, if loud speaker is placed in the audio amplifier, when loud speaker shakes, the sound wave that produces is from the inwall reflected back cone of audio amplifier, and cone moves thereupon, produces induced electromotive force on voice coil loudspeaker voice coil again, with the signal voltage stack that adds, disturb the voltage of actual driving cone, influenced the vibrations of cone, produced harmonic distortion.
The power amplifier final stage of sound box system adopts voltage negative to feed back stable operating point in the prior art, has just solved dynamic distortion.Phase distortion is not had any inhibitory action, cause the sound generating phase distortion that restores.
It is zero super fidelity sound-reducing device that the purpose of this utility model provides a kind of sound phase distortion that sound equipment is restored.
The purpose of this utility model realizes by the following technical solutions, it does not change the power amplifier prime of existing sound system, the voltage negative feedback network that it mainly will have the power amplifier final stage of sound system now changes current negative feedback network into, can realize that the sound phase distortion that restores is zero.
Described current negative feedback network is made up of resistance R 1, RF and R2, the power amplifier prime output of resistance R 1 one termination sound systems, the input anode of another termination current amplifier A.The input negative pole of resistance R F one termination current amplifier A, the other end and resistance R 2 series connection ground connection, the output of current amplifier A is by audio amplifier and resistance R 2 ground connection.
The utility model is owing to the power amplifier final stage at sound system has adopted current negative feedback network, can make by the electric current in the voice coil loudspeaker voice coil linear with the voltage that is added to power amplifier final stage input, thereby make the vibrations of cone and signal identical, solved power amplifier--the phase distortion problem of sound box system.Simultaneously owing to thereby the electric current of directly controlling voice coil loudspeaker voice coil has suppressed to have reached the purpose of super fidelity sound-reducing because the capacitance-resistance characteristic of voice coil loudspeaker voice coil and self induction electromotive force to the influence of sound-reducing, make the power amplifier final stage more effective to the driving of audio amplifier fully.
The utility model is simple and direct and can reduce cost greatly, improves performance, is the optimal path of realizing super fidelity sound-reducing.
Below in conjunction with accompanying drawing the utility model is further described:
Fig. 1 is the schematic diagram of this utility model;
As shown in Figure 1, the utility model comprises enclosure current amplifier A, and it is the power amplifier final stage of various sound systems, is characterized in: it is the impressed current negative feedback network on amplifier A, it comprises resistance R 1, RF, R2, the power amplifier prime output of resistance R 1 one termination sound systems, the input anode of another termination current amplifier A, the input negative pole of resistance R F one termination current amplifier A, the other end and resistance R 2 series connection ground connection, the output of current amplifier A is by audio amplifier and resistance R 2 ground connection.
Through the input anode of resistance R 1, output to audio amplifier after through current amplifier A electric current being amplified from the signal of power amplifier prime output to current amplifier A, current signal by audio amplifier after resistance R 2 to ground.Obtain the Current Negative Three-Point Capacitance signal through the input negative terminal of resistance R F through resistance R 2 simultaneously to current amplifier A.Constitute a complete Current Negative Three-Point Capacitance amplifier.Because the phase distortion of Current Negative Three-Point Capacitance amplifier is zero.Thereby the phase distortion of the output current of current amplifier is zero.Again because the vibrations of audio amplifier cone are linear with the electric current that flows through voice coil loudspeaker voice coil, thereby guaranteed that the vibrations of cone often hold highly consistent with input signal.Guaranteed that promptly the sound phase distortion that audio amplifier sends is zero.In addition, because the factor in the various external worlds (comprise audio amplifier inside, outside sound reflecting, and the acoustic resonance of audio amplifier inside, and harmonic wave) the cone vibrations that cause, can in voice coil loudspeaker voice coil, form induced current, this induced current constitutes the loop through current amplifier A and resistance R 2, and on resistance R 2, produce voltage drop and feed back to current amplifier A input negative pole through resistance R F, to have suppressed the sound that a variety of causes causes effectively contaminated thereby this signal amplifies back current signal that equates with the inductive current direction opposite magnitude of formation in voice coil loudspeaker voice coil through current amplifier A.
Claims (2)
1. super fidelity sound-reducing device comprises shell, current amplifier A, it is the power amplifier final stage of various sound systems, it is characterized in that: described reduction apparatus also comprises one, and can to make the sound phase distortion that restores be zero current negative feedback network.
2. super fidelity sound-reducing device as claimed in claim 1, it is characterized in that: described current negative feedback network is made up of resistance R 1, RF and resistance R 2, the power amplifier prime output of resistance R 1 one termination sound systems, the input anode of another termination current amplifier A, the negative pole of resistance R F one termination current amplifier A, the other end and resistance R 2 series connection ground connection, the output of current amplifier A is by audio amplifier and resistance R 2 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96213270 CN2281621Y (en) | 1996-06-15 | 1996-06-15 | Super high-fine audio play-back device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96213270 CN2281621Y (en) | 1996-06-15 | 1996-06-15 | Super high-fine audio play-back device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2281621Y true CN2281621Y (en) | 1998-05-13 |
Family
ID=33895667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96213270 Expired - Fee Related CN2281621Y (en) | 1996-06-15 | 1996-06-15 | Super high-fine audio play-back device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2281621Y (en) |
-
1996
- 1996-06-15 CN CN 96213270 patent/CN2281621Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |