CN2254258Y - Audio amplifier - Google Patents

Abstract

The utility model relates to a sound box. A horn of specific parameters is selected to be matched with a corresponding front cavity body and a corresponding back cavity body which are especially designed. A front tuning pipe and a back tuning pipe which respectively belong to the front cavity body and the back cavity body are selected. The utility model has the combination of the horn parameters which are different from other similar products and tuning frequency. The sound box has the advantages of small volume, good bass effect, simple structure, low cost, and flexible and convenient usage.

Description

A kind of audio amplifier

The utility model belongs to sound equipment, particularly a kind of structure of audio amplifier.

The rationale of this audio amplifier is derived from six rank band-pass loudspeaker systems, the proposition of this theory starts from 1930's, owing to be subjected to the restriction of corresponding research and service condition, cut (E.R.Geddes. An Introduction to Band-Pass LoudspeakerSystems J.A.E.S.Vol.37.1989) according to the document note, just make product and introduce to the market by Bose company and EAW (Eastern Acoustlc works) company up to the beginning of the eighties.But because the logical audio amplifier technical parameter of six rank bands requires high, structure is complicated, and the matching value between each element is easy to generate deviation, so develop comparatively difficulty of a new product, but in case success, its tone color particularly bass effect then can be better than other audio amplifier.The general cost of existing this series products is higher, is applied to high end audio more, can be restricted because the cost of audio amplifier is high as being used for low and middle-grade sound equipments.In addition as closed and reflective audio amplifier, owing to the combination between loudspeaker and casing, the reflection tube generally is not specially for low-frequency effect designs, tone color is undesirable all the time down to from high request.

The purpose of this utility model is to provide a kind of cost low, and six rank bands of good tone color lead to audio amplifier.

The purpose of this utility model is achieved in that

Audio amplifier of the present utility model, form by loudspeaker, tuning pipe, casing, loudspeaker 1 are contained fully in sound box 2, between loudspeaker basin and the front and back sound box wall certain space is arranged respectively, casing chamber 3 and rear cabinet body cavity 4 before constituting, on preceding casing chamber and the rear cabinet body cavity sidewall tuning pipe 5,6 is housed respectively, and opening is arranged on sidewall, chamber, front and back wall is placed with sound-absorbing material.According to the State Standard of the People's Republic of China, loud speaker main performance method of testing, (GB9396-88) described in: " total quality factor Q _tAdd the equivalent volume Veq and the resonance frequency f of loudspeaker unit.Be enough to determine the low frequency characteristic of loud speaker together." by the Helmholtz resonance formula: $f=\frac{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="Y9520670900092.png"\; state="\{\{state\}\}">C</figure-callout>}}{2\mathrm{\&pi;}}\sqrt{\frac{S}{{\mathrm{VL}}_R}},$ Wherein C is the velocity of sound, and S is tuning tube opening area, and V is the sound box volume, L _RBe tuning pipe equivalent length.Go out the theoretical parameter of each value with this formula primary Calculation, and pass through the correction of actual measurement repeatedly, each component parameters that can obtain obtaining best tone color under the prerequisite that as far as possible reduces the audio amplifier volume is:

Parametric loudspeaker: specified resonance frequency f.Be 45Hz ± 20%, equivalent Q value Q _tBe 0.5 ± 20%, equivalent volume Veq is 18000cm ³± 20%; Audio amplifier ante-chamber 3 volume V ₁Be 4000cm ³--15000cm ³, preceding tuning pipe 5 aperture area S ₁Be 20cm ²--60cm ², length L ₁Be 1cm--15cm; Back cavity 4 volume V ₂Be 15000cm ³--45000cm ³, the tuning pipe 6 aperture area S in back ₂Be 10cm ²-60cm ², length L ₂Be 10cm-45cm; The tuned frequency f that constitutes ₁Be 80Hz-160Hz and f ₂Combination for 35Hz-70Hz.

From technique scheme as can be seen, because the utility model has adopted the loudspeaker of special parameter, tuning pipe and sound box, give one's full attention to parameter choose and each element between cooperation, improved the tone color of this audio amplifier and particularly given prominence to bass effect, and made the volume of audio amplifier reduce (to can be as small as 20000cm ³), cost reduces, simple in structure, but one or many loudspeaker series, parallel, plug into respectively, in stereophonic sound system, use, its acoustics is further brought into play, easy to use, improved in the past the situation that the restriction owing to audio amplifier itself can not demonstrate fully the clear stereo effect.

Below in conjunction with description of drawings several embodiment of the present utility model:

Fig. 1 is two schematic diagrames that loudspeaker are installed in the same way.

Fig. 2 is an ante-chamber scheme of installation in face of four loudspeaker.

Fig. 3 is that two loudspeaker are in the face of overlapping installation diagram.

Among the figure: 1, bass horn; 2, sound box; 3, casing ante-chamber; 4, casing back cavity, 5, preceding tuning pipe; 6, the tuning pipe in back.

Embodiment one, and as shown in Figure 1, two loudspeaker 1 are placed in the sound box 2 in the same way, forms the front and back body cavity 3,4 of two huge shapes, and preceding tuning pipe 5 and the tuning pipe 6 in back place respectively on the side of front and back body cavity, and opening is arranged.Each component parameters is:

Parametric loudspeaker: resonance frequency f ₀For: 45Hz ± 20%

Equivalence Q value Q _tFor: 0.5 ± 20%

Equivalent volume Veq is: 18000cm ³± 20%

Cavity volume V before the audio amplifier ₁For: 73000cm ³

Preceding tuning pipe area of section S ₁For: 40cm ²

The preceding cross-section length L of tuning pipe ₁For: 1.5cm

Back cavity volume V ₂For: 19800cm ³

The tuning pipe area of section S in back ₂For: 40cm ²

The cross-section length L of the tuning pipe in back ₂For: 15cm

Tuned frequency f ₀For: 53Hz f ₂For: 150Hz

Embodiment two, and as shown in Figure 1, two loudspeaker 1 are placed in the sound box 2 in the same way, form the front and back body cavity 3,4 of two huge shapes, and preceding tuning pipe 5 and the tuning pipe 6 in back place respectively on the side of front and back body cavity, and opening is arranged.Each component parameters is:

Parametric loudspeaker: resonance frequency f ₀For: 45Hz ± 20%

Equivalence Q value Q _tFor: 0.5 ± 20%

Equivalent volume Veq is: 18000cm ³± 20%

Cavity volume V before the audio amplifier ₁For: 9500cm ³

Preceding tuning pipe area of section S ₁For: 40cm ²

The preceding cross-section length L of tuning pipe ₁For: 5cm

Back cavity volume V ₂For: 18000cm ³

The tuning pipe area of section S in back ₂For: 40cm ²

The cross-section length L of the tuning pipe in back ₂For: 25cm

Tuned frequency f ₁For: 107Hz f ₂For: 46Hz

Embodiment three, and as shown in Figure 1, two loudspeaker are placed in the sound box 2 in the same way, form the front and back body cavity 3,4 of two huge shapes, and preceding tuning pipe 5 and the tuning pipe 6 in back place respectively on the side of front and back body cavity, and opening is arranged.Each component parameters is:

Parametric loudspeaker: resonance frequency f ₀For: 45Hz ± 20%

Equivalence Q value Q _tFor: 0.5 ± 20%

Equivalent volume Veq is: 18000cm ³± 20%

Cavity volume V before the audio amplifier ₁For: 5500cm ³

Preceding tuning pipe area of section S ₁For: 30cm ²

The preceding cross-section length L of tuning pipe ₁For: 4cm

Back cavity volume V ₂For: 24000cm ³

The tuning pipe area of section S in back ₂For: 50cm ²

The cross-section length L of the tuning pipe in back ₂For: 25cm

Tuned frequency f ₁For: 134Hz f ₂For: 44Hz

Embodiment four, and as shown in Figure 2, two loudspeaker 1 are placed in the sound box 2 in opposite directions, form the front and back body cavity 3,4 of two rectangles, and preceding tuning pipe 5 and the tuning pipe 6 in back place respectively on the side of front and back body cavity, and opening is arranged, and each component parameters is:

Parametric loudspeaker: resonance frequency f ₀For: 45Hz ± 20%

Equivalence Q value Q _tFor: 0.5 ± 20%

Equivalent volume Veq is: 18000cm ³± 20%

Cavity volume V before the audio amplifier ₁For: 5000cm ³

Preceding tuning pipe area of section S ₁For: 30cm ²

The preceding cross-section length L of tuning pipe ₁For: 3cm

Back cavity volume V ₂For: 15000cm ³

The tuning pipe area of section S in back ₂For: 40cm ²

The cross-section length L of the tuning pipe in back ₂For: 30cm

Tuned frequency f ₁For: 148.7Hz f ₂For: 46Hz

Embodiment five, and as shown in Figure 3, four loudspeaker 1 are cross in twos relatively and are placed in the sound box 2, form the chamber, front and back 3,4 of two square types, wherein ante-chamber 3 is surrounded by back cavity 4, before and after the tuning pipe 6 of preceding tuning pipe 5 and back places respectively on body cavity top, and opening is arranged.Each component parameters is:

Parametric loudspeaker: resonance frequency f ₀For: 45Hz ± 20%

Equivalence Q value Q _tFor: 0.5 ± 20%

Equivalent volume Veq is: 18000cm ³± 20%

Cavity volume V before the audio amplifier ₁For: 15000cm ³

Preceding tuning pipe area of section S ₁For: 60cm ²

The preceding cross-section length L of tuning pipe ₁For: 2cm

Back cavity volume V ₂For: 35000cm ³

The tuning pipe area of section S in back ₂For: 60cm ²

The cross-section length L of the tuning pipe in back ₂For: 30cm

Tuned frequency f ₁For: 114Hz f ₂For: 37Hz

Claims (5)

1. audio amplifier, by loudspeaker (1), tuning pipe (5), (6) and sound box (2) constitute, and it is characterized in that loudspeaker (1) are contained fully in sound box (2), and the Loudspeaker diaphragm front and back is respectively anterior coelom (3) and posterior coelom (4), on front and back body cavity (3), (4) wall, tuning pipe is housed respectively, one end opening of pipe is in chamber wall, parametric loudspeaker, cavity size, the size of resonatron has certain regulation, to meet the characteristic of specific tuned frequency.

2. audio amplifier as claimed in claim 1, it is characterized by loudspeaker (1) is specific loudspeaker, the technical parameter of loudspeaker is: specified resonance frequency f ₀=45Hz ± 20%

Q _tValue=0.5 ± 20%

Equivalent volume Veq-18000cm ³± 20%

3. audio amplifier as claimed in claim 1 is characterized in that the relative position of the loudspeaker installed can be in the same way, and is incorgruous, overlapping, relatively or be other angle.

4. audio amplifier as claimed in claim 1 is characterized in that the technical parameter of tuning pipe (5) is: cross-sectional area S ₁=20-60 (cm ²), length L ₁=1-15 (cm), the technical parameter of tuning pipe (6) is: cross-sectional area S ₂=20-60 (cm ²), length L ₂=10-45 (cm).

5. audio amplifier as claimed in claim 1 is characterized in that casing is a rectangle, and the ratio of front and back cavity volume is V ₁: V ₂=1: 1.5-4.5.

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