CN2234165Y

CN2234165Y - Reversed-phase voise-frequency filter circuit for audio-system

Info

Publication number: CN2234165Y
Application number: CN95220151U
Authority: CN
Inventors: 许光智
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-28
Filing date: 1995-08-28
Publication date: 1996-08-28
Anticipated expiration: 2005-08-28
Also published as: DK89496A; CA2183385A1; GB2309352A; GB9601163D0; GB2309352B

Abstract

The utility model relates to a reverse phase audio frequency filter circuit structure of a sounding system. The utility model is characterized in that a main circuit of an input sound source is communicated with a trumpet positive coil, the middle segment of the main circuit is connected in parallel with an auxiliary circuit, the front end of the auxiliary circuit is additionally provided with a filtering capacitor, the end of the auxiliary circuit additionally provided with an auxiliary coil which has reverse phase with the positive coil of the main circuit, and the middle segments of the positive coil and the negative coil are mutually connected in series and earthed, which makes the both ends connected in reverse phase. Audio frequency signals sent out by the positive coil utilize the auxiliary coil to eliminate unnecessary audio frequency components so as to output better sound effect, and the utility model has the advantages of simple circuit structure, creativeness and practicability.

Description

The anti-phase audio frequency filter circuit construction of sound system

The utility model relates to the filter circuit in a kind of sound system, refers to that especially the major and minor loop construction of the easy anti-phase audio frequency of a kind of employing reaches antiposition cross-talk phase of wave and offsets mutually, with the anti-phase audio frequency filter circuit construction of the sound system of the unnecessary audio frequency of filtering.

As everyone knows, the effect of loudspeaker is to make an amount of expansion of volume and enhancing, and in the design of loudspeaker, general portion within it is provided with the RC filter that many groups have filter effect, by this filter, uncomfortable in the source of sound or unwanted audio frequency can be eliminated, and the sound equipment that output has better effect, especially existing Music centre loudspeaker is to reach the purpose of beautifying tonequality, often use the monomer of many group different frequencies response to share out the work and help one another simultaneously, check and balance for preventing the sound that each monomer sends, thereby must be by filter, so that inapplicable audio frequency in each monomer is given filtering, the sound equipment that the people is felt comfortably cool with output.And the filter circuit of its loudspeaker audio frequency design in existing sound equipment, mainly be shown in Figure 1A, Figure 1B, to specialize in the device of low frequency filtering or High frequency filter being preset with array in the loudspeaker, and it main according to principle is, the design that the circuit structure of general low frequency filtering is only got high frequency waves, shown in Figure 1A is by three groups of C ₁And R ₁, C ₂And R ₂, C ₃And R ₃The low-frequency filter of forming, wherein C ₃, R ₃The place of linking meets coil L in the loudspeaker.Promptly, add a capacitor C at sound source input end ₁, and in capacitor C ₁A resistance R terminal in parallel ₁, and by the obstruction of resistance, make by first capacitor C ₁The source of sound of filtering can be suitable the unnecessary bass of filtering because the response curve of whole source of sound frequency is to be

Shape, and each filter design is gradual, shape as shown in Figure 2, promptly the original frequency response curve is the Aa curve, when the acoustic frequency response curve through the filtering first time just becomes the Bb curve, again through C ₂The filtering second time after, then just form the Cc curve, according to what of filter times, just can reach own needed audio frequency output; Shown in Figure 1B is to be L by three groups of inductance coils and electric capacity ₁And C ₁, L ₂And C ₂, L ₃And C ₃The high-frequency filter circuit of forming, wherein L ₃And C ₃The place of linking meets coil L in the loudspeaker.Promptly by sound source input end default inductance L on incoming line ₁, be arranged in parallel a capacitor C again at the inductance output end of this circuit ₁Get the bass in its audio frequency, clamor via a plurality of identical inductance and capacitor filtering, can reach preferable acoustics, and, can significantly find out by in the filter curve shown in Figure 2, after source of sound is subjected to repeatedly Filtering Processing, by the gain of representing power output on Fig. 2 partly, will reduce significantly because of filter action, that is it is changed to Dd by Aa.Curvilinear motion can be found out thus, the power output loss that is produced in existing circuit greatly, this just means, when the loudspeaker power output is increased, then its source of sound power just needs to increase significantly, and actual sound equipment power output is that a restriction is arranged, and the technology barrier that traditional passive type partial loudspeaker can't be broken through in this general just sound equipment, therefore designing easy filter circuit makes the loss of gain part in the sound system reduce to minimum, and the power output of sound equipment can appropriateness lifting, this is that manufacturing firm is always in the problem of active research.

The purpose of this utility model is to provide a kind of employing easy filter circuit, just can obtain the preferable sound equipment output of each partial loudspeaker, and whole gain is not suffered a loss, thereby can improve the anti-phase audio frequency filter circuit construction of the sound system of whole sound equipment power output, to overcome the shortcoming of prior art.

The utility model concrete structure is described in detail as follows in conjunction with the embodiments:

Figure 1A is existing bass filter circuit reference diagram.

Figure 1B is existing high audio filter circuit reference diagram.

Fig. 2 is existing tone filter circuit output power curve schematic diagram.

Fig. 3 A is a low pass filter conspectus of the present utility model.

Fig. 3 B is a high pass filter conspectus of the present utility model.

Fig. 4 is low pass filter audio frequency of the present utility model and output power curve schematic diagram.

Fig. 5 A, Fig. 5 B are the band pass filter conspectuses of two different embodiment of the utility model.

Fig. 6 is band pass filter audio frequency of the present utility model and output power curve schematic diagram.

The integrally-built improvement of the utility model mainly is can produce resonance according to the mutually identical sound wave in frequency position, and frequency is identical, the principle that the mutually opposite sound wave in position is then cancelled out each other, on the filter circuit of the inside assembling of each the partial loudspeaker in general sound equipment, the circuit of low-pass filtering as shown in Figure 3A, with the unaccommodated medium-high frequency audio frequency of filtering, make it can reach comparatively ideal bass sound equipment output, the whole filter line construction is directly main line to be communicated on the positive coil Lm of loudspeaker at a sound source input end, this is for source of sound being directly inputted on this positive coil Lm, and by the main line stage casing of input another auxiliary line that is communicated with it in parallel, front end at this auxiliary line connects a low-pass filtering capacitor C x, during it can limit, high frequency sound wave passes through, and with parallel connection connect to line end one with main line on positive another anti-phase secondary voice coil Lx of coil Lm, and with the mutual stage casing ground connection of connecting of two coil outputs, make two ends become anti-phase design, when source of sound is input to two coil Lm by input, behind the Lx, promptly because secondary coil Lx in be anti-phase in, the sound signal of high frequency, so will with the positive that produced on the main line in, high frequency sound wave is offset, and reaches the purpose of eliminating high frequency sound wave.It is long-pending that the curve of audio frequency wavelength as shown in Figure 4 contains capping, the triangle area in the high audio zone that the zone surrounded by frame of BCD shown in this curve is just relative with its top is corresponding, and cancel out each other, and extend to the wavelength curve of audio frequency, can vertically fall the D point, the high frequency sound equipment of latter end is eliminated fully, and be the size that reaches the audio frequency that control eliminates, connect an adjustable resistance R at the end of secondary coil Lx ₁, make its output signal size that can control auxiliary line, controlling the zone of actual filtering, shown in Fig. 3 A, Fig. 3 B be just, the interconnective two kinds of different modes of secondary coil Lm, Lx.

Fig. 5 A, Fig. 5 B, shown in Figure 6 be the line construction schematic diagram of the bandpass filtering that forms of the needs of the sound equipment that sent according to actual each partial loudspeaker, that is with low pass filter line construction design class seemingly, be needs low for filtering, high frequency sound wave, on the main line of actual source of sound input, connect the capacitor C of a special filtering low frequency ₁, so that the low frequency in the source of sound of input is directly got rid of, again main line is connected to the positive coil Lm of loudspeaker, pass through in order to specialize in high-frequency signals and one high pass capacitor C x is installed at the input of main line parallel connection, cooperate another anti-phase secondary coil Lx and adjustable resistance R again ₁Setting so that after source of sound input, handle through this band pass filter circuit again, all height sources of sound will be by effective filtering, whole sound wave promptly becomes intermediate frequency range shown in Figure 6 partly, and makes the sound equipment output of each partial loudspeaker better.

And can clearly find out in the filter curve schematic diagram by Fig. 4 and Fig. 6, sound equipment controlling Design with the inverse filter circuit shown in the utility model, it is the most direct and be apparent that, the yield value of whole sound equipment output, after Filtering Processing of the present utility model, the ratio of its whole gain can lose hardly, the power of opposite whole sound equipment output can significantly increase with it, and make the output of whole sound equipment can be because of linear loss, and cause the reduction of loudspeaker power output, thereby can reach high power output.And because its whole line design only sets up a secondary coil Lx or directly pulls out a line end in main coil Lm stage casing in actual loudspeaker, make its ground connection form two anti-phase connections just, secondary coil Lm, Lx, cooperate the capacitor C of each low-and high-frequency again ₁, Cx can play the effect that the audio signal of need removing is subdued in control, and reaches the effect that improves partial loudspeaker power output and improve the output acoustic mass.

In sum, the utility model is eliminated unwanted audio frequency with easy line construction, thereby improves the power output of loudspeaker stereo, and effectively improves output tonequality, and its novel structure is creative, and practical.

Claims

1, a kind of anti-phase audio frequency filter circuit construction of sound system, comprise a plurality of main lines that are installed in each partial loudspeaker inside in the sound system with filter action, on each main line by the filter audio frequency electric capacity, resistance and horn coil are formed, it is characterized in that the main line of importing source of sound is communicated with the positive coil Lm of loudspeaker, this main line stage casing auxiliary line in parallel, install a filter capacitor Cx additional at described auxiliary line front end, and the end of this auxiliary line install additional one with main line on positive anti-phase another secondary coil Lx of coil Lm, this just, secondary coil Lm, the stage casing ground connection that Lx connects mutually makes two ends become anti-phase connection.

2, the anti-phase audio frequency filter circuit construction of sound system according to claim 1 is characterized in that described main coil Lm stage casing can ground connection, to form anti-phase main and sub-coil.

3, the anti-phase audio frequency filter circuit construction of sound system according to claim 1 is characterized in that the terminal adjustable resistance R of installation of described secondary coil Lx ₁