JP2016192702A - Microphone and pop filter for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable pop noise to be reduced with a simple configuration.SOLUTION: A microphone 1 includes: a microphone unit 10 provided with a diaphragm 11, for converting voice into an electric signal; and a pop filter 30 covering the microphone unit 10. The pop filter 30 is provided with a sound wave introduction face 33 having an angle with respect to the diaphragm 11 at a portion corresponding to a front part of a directional axis. The sound wave introduction face 33 rectifies an air current that reaches the diaphragm 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a microphone and a microphone pop filter.

  Pop noise generated by a microphone is generated when a sudden change in airflow occurs in the vicinity of the directional axis of the microphone (in the main axis direction) when the microphone picks up a plosive sound or the like.

  Conventionally, as shown in FIG. 6, a pop filter 300 that is elastic and stretched around a frame is provided between the microphone 100 and the speaker 200 to change the flow of airflow from the front of the directional axis. The pop noise was reduced.

  In addition, a technique is disclosed in which a pop-up noise is reduced by providing a donut-shaped notch at the tip of the windscreen that covers the tip of the microphone (see, for example, Patent Document 1).

No. 1-334470

In the conventional technique, a pop filter having a predetermined area is attached in front of the directional axis of the microphone every time it is used. Therefore, the conventional pop filter is large, and when used for a meeting or an interview, it has been a problem to hide the speaker so as to cover it. Also, with the technique disclosed in Patent Document 1, the flow of airflow in front of the directional axis does not change sufficiently, and it is difficult to reduce pop noise. Therefore, there has been a demand for a pop filter that reduces pop noise with a simple configuration.

  An object of the present invention is to provide a microphone capable of reducing pop noise with a simple configuration.

  The present invention includes a microphone unit that includes a diaphragm and converts sound into an electrical signal, and a pop filter that covers the microphone unit. The pop filter has an angle with respect to the diaphragm at a front portion of a directional axis. A sound wave introduction surface is provided.

  According to the present invention, pop noise can be reduced with a small configuration.

It is a fragmentary sectional side view which shows embodiment of the microphone which concerns on this invention. It is a sectional side view which shows embodiment of the pop filter for microphones which concerns on this invention. It is a schematic diagram which shows the use condition of the pop filter for microphones of FIG. FIG. 5 is an enlarged side view showing the microphone of FIG. 4 and a microphone pop filter. It is a sectional side view which shows another embodiment of the pop filter for microphones which concerns on this invention. It is a schematic diagram which shows the use condition of the pop filter for microphones of a reference example.

  Embodiments of a microphone and a microphone pop filter according to the present invention will be described below with reference to the drawings.

Configuration of Microphone A microphone 1 according to the present embodiment shown in FIG. 1 covers a microphone unit 10 that converts sound into an electrical signal, a housing 20 that houses the microphone unit 10, and the housing 20. And a pop filter 30.

  The microphone unit 10 is a unidirectional electret condenser microphone unit. The microphone unit 10 includes a diaphragm 11 that vibrates by sound, a circuit board 12 on which necessary electronic components are mounted, and a unit case 13 that accommodates the diaphragm 11 and the circuit board 12. The microphone unit 10 realizes unidirectionality by taking sound from two directions of the front opening 21 and the rear opening 22 with the diaphragm 11 in between.

  The housing 20 is a substantially cylindrical member. The housing 20 covers the microphone unit 10. The housing 20 is provided with a front opening 21 on the front surface and a rear opening 22 on the side surface.

Configuration of Pop Filter As shown in FIG. 2, the pop filter 30 includes a filter main body 31, a housing portion 32, a sound wave introduction surface 33, and a rectifying member 34. The pop filter 30 is attached to the housing 20 to cover the diaphragm 11 of the microphone unit 10.

  The filter body 31 is made of the same material as that of a general wind screen, for example, a material that can pass air such as polyurethane. The filter main body 31 is provided with a housing portion 32 and a sound wave introduction surface 33. The filter body 31 defines the general shape of the pop filter 30.

  The accommodating portion 32 has a shape corresponding to the shape of the housing 20 and is open on the rear end side of the pop filter 30. The housing 20 is accommodated in the housing portion 32 by inserting the housing 20 of the microphone 1 from the open rear end side. For example, the housing 20 has a substantially cylindrical shape, and the housing portion 32 has a substantially cylindrical shape as well. Therefore, the front surface 201 and the side surface 202 of the housing 20 are covered with the filter body 31 by inserting the housing 20 into the housing portion 32.

  The sound wave introduction surface 33 is provided at the front portion of the microphone 1 in the sound collection direction. The sound wave introduction surface 33 is located between the sound source and the front opening 21 of the microphone 1 when the microphone 1 is used. Therefore, the sound wave is taken into the front of the diaphragm 11 of the microphone unit 10 from the sound source through the sound wave introduction surface 33.

  As shown in FIG. 1, the sound wave introduction surface 33 has an angle with respect to the diaphragm 11 of the microphone 1 accommodated in the accommodation portion 32. Specifically, the sound wave introduction surface 33 is inclined from the front to the rear in the direction of the directional axis (main axis direction) (so as to incline forward in the main axis direction with respect to the diaphragm 11). The inclination angle of the sound wave introduction surface 33 is preferably about 45 ° with respect to the diaphragm 11, for example.

  The rectifying member 34 is a fibrous (pile-shaped) member provided on the surface of the filter main body 31 including the sound wave introduction surface 33. The rectifying member 34 extends vertically or substantially vertically from the surface of the filter body 31. The rectifying member 34 is implanted on the surface of the filter body 31 including the sound wave introduction surface 33 by, for example, electrostatic flocking.

  As shown in FIG. 3, out of the sound wave W generated by the sound wave introduction surface 33 from the mouth of the speaker 200, the air current W <b> 2 having strong energy that causes pop noise is along the inclination of the sound wave introduction surface 33. Flowing. Therefore, the airflow W2 does not reach the diaphragm 11 directly. That is, in the microphone 1, only the desired sound current W <b> 1 out of the sound current W generated from the mouth of the speaker 200 can be introduced into the diaphragm 11 by the sound wave introduction surface 33. The microphone 1 is particularly effective for a sound wave having a high instantaneous sound pressure due to a plosive sound.

  The direction in which the sound wave introduction surface 33 is inclined is preferably such that the thickness of the filter body 31 is larger than the noise source of pop noise (such as the mouth of the speaker 200 and the air outlet of the air conditioner). Specifically, the direction of inclination of the sound wave introduction surface 33 is preferably inclined in a direction away from the sound source of pop noise (from the upper left to the lower right in FIG. 3).

  As shown in FIG. 4, the rectifying member 34 provided on the surface of the filter main body 31 including the sound wave introduction surface 33 has a property of being bent by the air flow W2. In FIG. 4, the rectifying member 34 is bent from the upper left of FIG. 3 to the lower right due to the influence of the air flow W2, as compared with the rectifying member 34 not affected by the air flow W2 shown in FIG.

  With this rectifying member 34, in the microphone 1, the flow direction of the air flow W <b> 2 that causes pop noise can be rectified in a direction deviating from the front opening 21, thereby reducing pop noise. Further, the rectifying member 34 allows the microphone 1 to consume the energy of the airflow W2 and reduce pop noise.

  In the pop filter 30 described above, the example in which the rectifying member 34 is provided on the surface of the filter body 31 has been described. However, even if the pop filter 30A does not have the rectifying member 34 as shown in FIG. Can be reduced.

DESCRIPTION OF SYMBOLS 1 Microphone 10 Microphone unit 11 Diaphragm 12 Circuit board 13 Unit case 20 Case 21 Front opening 22 Rear opening 30 Pop filter 31 Filter body 32 Housing part 33 Sound wave introduction surface 34 Rectification member

Claims (9)

A microphone unit that includes a diaphragm and converts sound into an electrical signal;
A pop filter covering the microphone unit;
Have
The pop filter is provided with a sound wave introduction surface having an angle with respect to the diaphragm at a portion corresponding to the front of the diaphragm.
Microphone. The sonic wave introduction surface is provided with a rectifying member that rectifies the airflow.
The microphone according to claim 1. The rectifying member is a fibrous member extending vertically from the sound wave introduction surface,
The microphone according to claim 2. The rectifying member is implanted in the sound wave introduction surface by electrostatic machining,
The microphone according to claim 2 or 3. The sound wave introduction surface is inclined from the front to the rear in the direction of the directivity axis of the microphone unit.
The microphone according to any one of claims 1 to 4. A housing covering the microphone unit;
An opening provided on the front surface of the housing;
Have
The pop filter covers the microphone unit via the housing.
The microphone according to any one of claims 1 to 5. A microphone unit that includes a diaphragm and converts sound into an electrical signal;
A pop filter used for a microphone having a housing covering the microphone unit;
A filter body having a shape covering the housing;
An accommodating portion having a shape corresponding to the housing;
A sound wave introduction surface provided at the filter body and having an angle with respect to the diaphragm of the microphone unit housed in the housing portion;
Having
Microphone pop filter. The sonic wave introduction surface is provided with a rectifying member that rectifies the airflow.
The microphone pop filter according to claim 8. The rectifying member is a fibrous member extending vertically from the sound wave introduction surface,
The microphone pop filter according to claim 9.

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