CN204190904U - A kind of microphone exponential type adapter - Google Patents

Abstract

A kind of microphone exponential type adapter, comprise the cylindrical shell with a length, cylindrical shell two ends are respectively the circular throat with the first diameter and the circular open portion with Second bobbin diameter, wherein the first radius is less than the second radius, throat is for connecting microphone, peristome is acoustic wave inlet, and cylindrical shape is exponential type; Directive property and the sensitivity of microphone can be strengthened by this exponential type adapter, be mainly used in the detection of remote pickup under noisy environment and small-signal.

Description

A kind of microphone exponential type adapter

Technical field

The application relates to a kind of microphone exponential type adapter, belongs to audion technic field.

Background technology

For noisy environment or remote pickup, microphone of the prior art usually can not satisfy the demands.

Utility model content

For overcoming above-mentioned deficiency, the application proposes a kind of microphone exponential type adapter, to strengthen directive property and the sensitivity of microphone, is mainly used in the detection of remote pickup under noisy environment and small-signal.

A kind of microphone exponential type adapter is provided, comprise the cylindrical shell with a length, cylindrical shell two ends are respectively the circular throat with the first diameter and the circular open portion with Second bobbin diameter, wherein the first radius is less than the second radius, throat is for connecting microphone, peristome is acoustic wave inlet, and cylindrical shape is exponential type.

Further, cylindrical shell is provided with handle.

Wherein, the diameter of throat 2 is set as 2.5cm, and the diameter of peristome 3 is set as 30cm, and the length setting of horn cylindrical shell 1 is 40cm.

The cylinder material of adapter selects stainless steel, thickness 1.5mm.

Accompanying drawing explanation

Accompanying drawing is the structural representation of microphone horn adapter of the present utility model

Embodiment

Because having reciprocity between microphone and loud speaker, this reciprocity makes a microphone to work together in directive property and frequency response two the identical loud speaker of the same design such as all very.According to reciprocity, the utility model proposes a kind of microphone exponential type horn microphone adapter obtaining highly directive.After adding horn adapter, the aduncate degree of exponential type horn wall is larger, effectively can shield the sound of a rear part, and after diaphragm of microphone front adds horn adapter, be equivalent to the area adding vibrating diaphragm, active force on vibrating diaphragm is increased, and the sensitivity of microphone also can correspondingly improve.

In the horn speaker of various shape, although the acoustic load of hyperbolic-type is best, the nonlinear distortion of hyperbolic horn is larger than the horn of other shapes.For same unit are power, the distortion of straight-tapered horn is minimum, but its acoustic reactance decays slowly in effective frequency range, and namely its electroacoustic efficiency is not too satisfactory.The performance of exponential type horn is then in hyperbola and straight-tapered horn between the two.

The basic parameter of an index horn has 4, i.e. throat radius a ₀, exit radius a _j, length l, wriggle exponent m, according to the following step, exponential type horn is designed:

1, according to the requirement of operating frequency range, the cut-off frequency of horn is determined;

2, the radius of throat section is determined according to the physical dimension of microphone and performance index;

3, ka is met _jthe condition of=1, determines a _j, wherein c ₀for the velocity of sound, f _cfor cut-off frequency;

4, again $f_c=\frac{{\mathrm{mc}}_0}{4\mathrm{\π}}$ With $a_1=\frac{c_0}{2\mathrm{\π}{f}_c}$ Determine m, $m=\frac{2}{a_1}$

5, such as low-frequency cut-off frequency f is supposed _c=300Hz, brings into obtain transmissibility during 700Hz: $\mathrm{\γ}=\sqrt{1-{\left(\frac{300}{700}\right)}^2}=0.903$

Analyze through above, a kind of design of horn is proposed, as shown in Figure 1, horn comprises the cylindrical shell 1 with a length, and cylindrical shell 1 two ends are respectively the circular throat 2 with the first diameter and the circular open portion 3 with Second bobbin diameter, and wherein the first radius is less than the second radius, throat 2 is for connecting microphone, peristome 3 is acoustic wave inlet, and cylindrical shell is that its sectional area, according to exponential type change, cylindrical shell can install handle 4 from throat to peristome; According to electroacoustic measurement and directivity measurement, obtaining preferred size is: the diameter of the throat 2 of horn is set as 2.5cm, and the diameter of peristome 3 is set as 30cm, and the length setting of horn cylindrical shell 1 is 40cm; Make the corrosion resistant plate that the Material selec-tion 1.5mm of horn is thick.Now, the low-frequency cut-off frequency of horn is 300Hz, has good electro-acoustic conversion efficiency at the Frequency point place of more than 700Hz.

The aduncate degree of exponential type horn adapter inwall is comparatively large, and it effectively can reflect a part of sound in other directions, and the directive property of microphone becomes more sharp-pointed.Add exponential type horn adapter in microphone front and not only can obtain sharp-pointed directive property, and the sensitivity that microphone promotes medium-high frequency section can be promoted.Such adapter is applicable to the recording of voice and the detection of small-signal in noisy environment.Horn adapter is used for outdoor recording can also windproof and rain proof.

Above embodiment is only schematically explain the present invention, and under the prerequisite ensureing technique effect, those skilled in the art's change on this basis all can be accepted.

Claims (4)

1. a microphone exponential type adapter, comprise the cylindrical shell with a length, cylindrical shell two ends are respectively the circular throat with the first diameter and the circular open portion with Second bobbin diameter, wherein the first radius is less than the second radius, throat is for connecting microphone, peristome is acoustic wave inlet, and cylindrical shape is exponential type.

2. microphone exponential type adapter as claimed in claim 1, cylindrical shell is provided with handle.

3. the microphone exponential type adapter as described in claim 1,2, wherein, the diameter of throat is set as 2.5cm, and the diameter of peristome is set as 30cm, and the length setting of horn cylindrical shell is 40cm.

4. the microphone exponential type adapter as described in claim 1,2, cylinder material selects stainless steel, thickness 1.5mm.