CN220422019U - Passive mirror image filtering low-frequency extension circuit - Google Patents
Passive mirror image filtering low-frequency extension circuit Download PDFInfo
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- CN220422019U CN220422019U CN202321964554.4U CN202321964554U CN220422019U CN 220422019 U CN220422019 U CN 220422019U CN 202321964554 U CN202321964554 U CN 202321964554U CN 220422019 U CN220422019 U CN 220422019U
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Abstract
The utility model provides a passive mirror image filtering low-frequency extension circuit, which comprises: the first filter and the second filter are connected in series between the low-frequency sound box system and the signal source, and the second filter is connected in series with the first filter, wherein: the first filter comprises a passive mirror filter; the second filter includes a band pass filter and a low pass filter. The passive image filtering low-frequency extension circuit provided by the utility model can be not limited by the restriction factors existing in the prior acoustic structure and active amplification circuit modes, can be applied to low-frequency sound boxes of any acoustic structure except for sacrificing the efficiency of part of the low-frequency units of the loudspeaker, is particularly suitable for being applied to baffle low-frequency sound boxes with low-frequency efficiency to realize the reproduction of ultra-low frequency bands (20-30 hz), and meanwhile, the passive image filtering low-frequency extension circuit is a passive filter circuit, has a simple circuit structure, is easy to manufacture and does not cause the deterioration of the output characteristics of the low-frequency sound boxes.
Description
Technical Field
The utility model relates to the technical field of speakers, in particular to a passive mirror image filtering low-frequency extension circuit.
Background
There are currently two general approaches in loudspeaker systems for achieving low frequency playback, especially playback in the ultra low frequency range (20-30 hz).
1. The acoustic structure mode is that the acoustic structure of different low-frequency sound boxes is designed, such as a closed low-frequency sound box, a phase inversion hole low-frequency sound box, a passive radiation low-frequency sound box, a band-pass low-frequency sound box, a baffle type low-frequency sound box and the like, so that low-frequency reproduction is realized. However, if playback at ultra low frequencies of 20-30hz is desired, the acoustic structure is limited by the physical dimensions of the speaker unit size and the enclosure size, and is difficult to use in a home high-fidelity enclosure system.
2. The active amplifying circuit mode is to raise the amplifying gain of the amplifying circuit at ultralow frequency (20-30 hz) based on the acoustic structure sound box to raise the output of the ultralow frequency band of the low frequency sound box, so as to realize the ultralow frequency replay. However, the mode has high requirements on the active amplifier, is easy to cause the characteristic degradation of the low-frequency sound box system, and is difficult to meet the requirements of the household high-fidelity sound box system.
For this purpose, a passive image filtering low-frequency extension circuit is proposed.
Disclosure of Invention
The utility model aims to solve the problems in the background technology, and provides a passive image filtering low-frequency extension circuit, the basic principle of which is to design a targeted passive image filtering circuit which is mirror-imaged relative to the characteristics of a low-frequency sound box by utilizing the characteristics of a high-pass filtering function of a high-efficiency low-frequency sound box system, and control and regulate the low-frequency output characteristics of the low-frequency sound box, thereby realizing the replay of an ultra-low frequency band (20-30 hz).
The specific technical scheme is as follows:
a passive image filtered low frequency extension circuit comprising: the first filter and the second filter of concatenating between low frequency audio amplifier system and signal source, the second filter with first filter series connection, wherein:
the first filter comprises a passive mirror filter;
the second filter includes a band-pass filter and a low-pass filter connected in parallel with the band-pass filter.
The passive image filtering low-frequency extension circuit, wherein: the passive image filter includes a low pass filter and a band pass filter connected in parallel.
The passive image filtering low-frequency extension circuit, wherein: the band-pass filter is composed of a resistor R1, a capacitor C1, an inductance coil L1, a capacitor C2 and a resistor R2.
The passive image filtering low-frequency extension circuit, wherein: the low-pass filter is composed of an inductance coil L2, a capacitor C3, a resistor R3, the inductance coil L3, a capacitor C4 and a resistor R4.
The utility model has the following beneficial effects:
the passive image filtering low-frequency extension circuit provided by the utility model can be not limited by the restriction factors existing in the prior acoustic structure and active amplifying circuit modes, can be applied to low-frequency sound boxes of any acoustic structure except for sacrificing the efficiency of part of the low-frequency units of the loudspeaker, is particularly suitable for being applied to baffle low-frequency sound boxes with lower low-frequency efficiency to realize the reproduction of ultra-low frequency bands (20-30 hz), and meanwhile, the passive image filtering low-frequency extension circuit is a passive filter circuit, has a simple circuit structure and is easy to manufacture, and the deterioration of the output characteristics of the low-frequency sound boxes is not caused;
the gain of the band-pass filter can be adjusted by adjusting the parameters of R1 to interface with the intermediate frequency output curve. Likewise, different low-frequency cut-off frequencies can be obtained by adjusting the parameters of the low-pass filters L2 and L3; the filter characteristic which is mirror image with the output characteristic of the low-frequency sound box can be obtained by adjusting the parameters of R3 and R4.
Drawings
Fig. 1 is a schematic diagram of a passive image filtering low-frequency extension circuit according to an embodiment of the present utility model;
FIG. 2 is a circuit diagram of a passive image filtering low-frequency extension circuit according to an embodiment of the present utility model;
fig. 3 is a graph of output characteristics of a passive image filtering low-frequency extension circuit according to an embodiment of the present utility model.
Detailed Description
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, rather than indicating or implying that the apparatus or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and should not be construed as limiting the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the present utility model, unless explicitly stated and limited otherwise, the term "coupled" or the like should be interpreted broadly, as it may be fixedly coupled, detachably coupled, or integrally formed, as indicating the relationship of components; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two parts or interaction relationship between the two parts. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Examples
The passive image filtering low-frequency extension circuit provided in this embodiment, as shown in fig. 1-3, includes: the first filter and the second filter are connected in series between the low-frequency sound box system and the signal source, and the second filter is connected in series with the first filter.
Wherein the first filter comprises a passive mirror filter; the second filter comprises a band-pass filter and a low-pass filter, and the low-pass filter is connected with the band-pass filter in parallel; the passive image filter comprises a low-pass filter and a band-pass filter connected in parallel, that is to say the first filter and the second filter are identical in circuit.
Specifically, the band-pass filter is composed of a resistor R1, a capacitor C1, an inductance coil L1, a capacitor C2 and a resistor R2; the low-pass filter consists of an inductance coil L2, a capacitor C3, a resistor R3, an inductance coil L3, a capacitor C4 and a resistor R4, and is used for adjusting the extension bandwidth of the bass loudspeaker box system and realizing the mirror filtering function; the band-pass filter has the functions of adjusting the gain of the filter circuit and adapting and balancing the sound pressure output of the intermediate frequency replay system.
Specifically, parameters of each element of the passive image filtering low-frequency extension circuit provided in this embodiment may be:
R1＝5Ω；C1＝100uf，L1＝5.6mh，C2＝180uf，R2＝3Ω；
L2＝6.8mh，C3＝330uf，R3＝10Ω，L3＝6.8mh，C4＝330uf，R4＝10Ω。
in summary, the passive image filtering low-frequency extension circuit provided in the embodiment has the following advantages:
the passive image filtering low-frequency extension circuit provided by the embodiment can be not limited by the restriction factors existing in the existing acoustic structure and active amplifying circuit modes, can be applied to low-frequency sound boxes of any acoustic structure except for sacrificing the efficiency of part of the low-frequency units of the loudspeaker, is particularly suitable for being applied to baffle low-frequency sound boxes with low-frequency efficiency to realize the reproduction of ultra-low frequency bands (20-30 hz), and meanwhile, the passive image filtering low-frequency extension circuit is a passive filter circuit, has a simple circuit structure and is easy to manufacture, and the deterioration of the output characteristics of the low-frequency sound boxes is not caused;
the gain of the band-pass filter can be adjusted by adjusting the parameters of R1 to interface with the intermediate frequency output curve. Likewise, different low-frequency cut-off frequencies can be obtained by adjusting the parameters of the low-pass filters L2 and L3; the filter characteristic which is mirror image with the output characteristic of the low-frequency sound box can be obtained by adjusting the parameters of R3 and R4.
The specific parameters of the passive image filtering low-frequency extension circuit and each original provided in this embodiment are input into computer simulation software to obtain a simulation result as shown in fig. 3, and as can be seen from fig. 3, the upper curve is an output characteristic curve of the original bass loudspeaker system, and as can be seen from the curve, the low-frequency cut-off frequency (-6 db) of the low-frequency system is about 50hz, after being processed by the passive image filtering low-frequency extension circuit, the output characteristic curve is a lower curve, and the low-frequency cut-off frequency (-6 db) of the output characteristic curve is about 20hz.
The foregoing is merely illustrative of the preferred embodiments of the present utility model and is not intended to limit the embodiments and scope of the present utility model, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (4)
1. A passive image filtering low frequency extension circuit, comprising: the first filter and the second filter of concatenating between low frequency audio amplifier system and signal source, the second filter with first filter series connection, wherein:
the first filter comprises a passive mirror filter;
the second filter includes a band-pass filter and a low-pass filter connected in parallel with the band-pass filter.
2. The passive image filtering low frequency extension circuit of claim 1, wherein the passive image filter comprises a low pass filter and a band pass filter connected in parallel.
3. The passive image filtering low frequency extension circuit according to claim 2, wherein the band pass filter is composed of a resistor R1, a capacitor C1, an inductor L1, a capacitor C2, and a resistor R2.
4. A passive image filtering low frequency extension circuit according to claim 3, wherein the low pass filter is composed of an inductor L2, a capacitor C3, a resistor R3, an inductor L3, a capacitor C4 and a resistor R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321964554.4U CN220422019U (en) | 2023-07-25 | 2023-07-25 | Passive mirror image filtering low-frequency extension circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321964554.4U CN220422019U (en) | 2023-07-25 | 2023-07-25 | Passive mirror image filtering low-frequency extension circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220422019U true CN220422019U (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321964554.4U Active CN220422019U (en) | 2023-07-25 | 2023-07-25 | Passive mirror image filtering low-frequency extension circuit |
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| CN (1) | CN220422019U (en) |
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2023
- 2023-07-25 CN CN202321964554.4U patent/CN220422019U/en active Active
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