JP2008048309A - Microphone accessories - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microphone accessory capable of reducing pop noise by being installed in front of a microphone.
SOLUTION: In order to prevent a sudden air flow generated by a plosive sound from directly hitting a microphone, a microphone accessory installed on the front surface of the microphone, the front filter being displaced by the air flow, the rear filter not being displaced by the air flow, It is constituted by a frame for fixing the front filter and the rear filter.
[Selection] Figure 1

Description

  The present invention relates to a microphone accessory that can reduce pop noise by being placed in front of a microphone.

  Pop noise is generated when a sudden air flow caused by a plosive sound hits the microphone directly. When picking up sound at a recording studio, etc., this pop noise becomes a problem, so a microphone accessory called a “pop filter” with a mesh made of elastic fibers attached to the ring frame in front of the macrophone is installed. In addition, the occurrence of pop noise is prevented.

  An example of a conventional pop filter is shown in FIG. In FIG. 3, the pop filter 20 displaces an airflow caused by a plosive sound generated on the left side in the drawing toward the front surface, and the rear surface is also displaced by an internal pressure change caused by this displacement. As the pop filter 20 is displaced in this way, the energy of the airflow is dispersed, and the microphone 5 is prevented from receiving a sudden airflow. In order to reduce the pop noise, a method of increasing the density of fibers used for the pop filter 20 or increasing the distance between the pop filter 20 and the microphone 5 to make it difficult for a sudden air current to be applied to the microphone 5 is used. It is.

  A filter using expanded metal is also known in addition to those using mesh fibers. FIG. 4 is a diagram showing a cross section of a filter 30 using expanded metal and an installation example. As in FIG. 3, the airflow caused by the plosive sound generated in the left direction toward the figure hits the stitch-shaped metal of the filter 30 and changes its direction. For this reason, it is possible to prevent a sudden airflow from directly hitting the microphone 5.

  In addition, a filter is attached to the front of the omnidirectional microphone unit so that the air flowing in from the sound hole on the front of the microphone unit is released to the outside through another sound hole provided in the front air chamber. An invention is known in which pop noise is reduced by preventing the disturbance and improving the sound quality of the sound transmitted to the microphone unit (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 07-212888

  Among the above-described conventional techniques, when the “pop filter” is used, if the density of the fibers constituting the mesh is increased, the acoustic resistance value is increased and the frequency response is deteriorated. In addition, if the distance between the microphone and the pop filter is increased, the distance between the sound source and the microphone is increased, and thus there is a restriction that recording using the proximity effect cannot be performed.

  In addition, a filter using expanded metal is rarely used because it is easy to generate incidental sound because the material is metal.

  In the invention described in Patent Document 1, since the above characteristic structure needs to be formed by a microphone unit, the present invention cannot be used with a general-purpose microphone. Therefore, in general-purpose microphones, in order to prevent deterioration in sound quality due to plosive sounds, it is possible to prevent plosive sounds using a conventional pop filter, etc., with the knowledge that the above-described drawbacks exist.

  The present invention has been made in view of the above problems, and a filter that is displaced by an air current is used on the front side of a filter that is installed in front of a microphone and is not displaced by an air current on the rear side. It is an object of the present invention to provide a microphone accessory that uses a filter having a shape that allows an air current to flow to the outside and prevents a sudden air current due to the sound of a plosive sound from being transmitted to the microphone.

  The present invention is a microphone accessory installed in front of the microphone in order to prevent a sudden air flow caused by a bursting sound from directly hitting the microphone, the front filter being displaced by the air flow, the rear filter not being displaced by the air flow, The main feature is that it is constituted by a frame for fixing the front filter and the rear filter.

  In the microphone accessory according to the present invention, the circumferential surface of the frame is provided with a hole for discharging the airflow generated inside to the outside.

  According to the present invention, since pop noise can be reduced with a simple configuration without increasing the density of the filter, there is no deterioration in the frequency response and sound quality of the microphone.

  Hereinafter, embodiments of a microphone accessory according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a filter which is a microphone accessory according to the present invention. 1A is a perspective view seen from the front surface (sound source side) of the filter, and FIG. 1B is a perspective view seen from the rear surface (microphone side) of the filter. In FIG. 1, a filter 10 is a circular frame 3, which is a mesh made of a fiber material, and a front filter 1 that is deformed by a sudden air flow caused by a plosive sound generated by a sound source is attached to the front side. It is a mesh made of a material that is less deformed by the airflow than the material, and a rear filter 2 processed into a substantially conical shape is attached to the rear surface. In addition, a plurality of discharge holes 4 are provided on the outer periphery of the frame 3 in order to discharge an air flow caused by a pressure change generated in the filter 10.

  The operation of the filter 10 will be described with reference to FIG. A sound source is present on the left side as viewed in FIG. 2, and the filter 10 is installed at a position to prevent a plosive sound uttered from the sound source from directly hitting the microphone 5 (FIG. 2 (a)). When the plosive sound hits the front filter 1, the front filter 1 is fixed by the frame 3, so that the central portion is displaced (FIG. 2 (b)). This displacement of the front filter 2 generates an air flow toward the rear filter 2, but the rear filter 2 has a substantially conical shape with the apex facing the front filter 1 side, and the material allows sound to pass through. Since a hard material that is not displaced by the airflow is used, the rear filter 2 is not displaced by the airflow, and no airflow is generated on the microphone 5 side. The airflow that hits the rear filter 2 Along the inclination of the filter 2, the filter 10 goes toward the outside of the filter 10.

  Since the airflow flows out from the discharge holes 4 provided on the circumference of the frame 3, a sudden airflow does not hit the microphone 5.

  The material of the front filter 1 is preferably a plain weave mesh made of nylon and having a wire diameter of 80 microns. The material of the rear filter 2 is preferably a stainless steel mesh having a wire diameter of 0.1 mm processed into a conical shape.

By using the filter 10 as described above, it is possible to prevent an abrupt air current from directly hitting the microphone 5, and thus it is possible to prevent the occurrence of pop noise.
Further, pop noise can be effectively prevented without increasing the density of the fibers used for the mesh.

It is a perspective view which shows the example of the structure of the microphone accessory which concerns on this invention. It is explanatory drawing which shows operation | movement of the microphone accessory which concerns on this invention. It is sectional drawing which shows the example of the conventional pop filter. It is sectional drawing which shows the example of the filter by the conventional expanded metal.

Explanation of symbols

1 Front filter 2 Rear filter 3 Frame 4 Discharge hole 10 Filter microphone

Claims (4)

A microphone accessory that prevents a sudden air flow caused by a plosive sound from directly hitting the microphone,
Front filter displaced by the airflow,
Rear filter that is not displaced by the airflow,
A frame for fixing the front filter and the rear filter;
A microphone accessory characterized by comprising.   2. The microphone accessory according to claim 1, wherein the frame is cylindrical, and a hole for discharging an air flow generated inside is provided on a circumferential surface of the frame.   The microphone accessory according to claim 1, wherein the front filter is a fiber woven in a mesh shape.   The microphone accessory according to claim 1 or 2, wherein the rear filter has a wire diameter larger than that of the fiber used for the front filter and is woven in a mesh shape of stainless steel.

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