JPS599502Y2 - Narrow angle directional small microphone - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a small and portable narrow-angle directional microphone.

When collecting sound in a noisy place, it is often difficult to collect sound with sufficient clarity even if the sound source is close, but it is often difficult to collect sound with sufficient clarity. If you use it, you can collect clear sound.

There are two types of narrow-angle directional microphones: wave type and sound pressure gradient type.

The former includes parabolic sound collectors (parabolic microphones) and phase sound collectors (line microphones), but these are bulky and unsuitable for portable use.

In the latter case, two primary sound pressure gradient type directional microphones are arranged in the same direction with a distance apart from each other as shown by symbols 1 and 2 in the principle diagram of Fig. 1, and a delay circuit 3 is connected to the output cord. This method uses the connected microphones as a secondary sound pressure gradient type directional microphone, and can be made relatively small.

An object of the present invention is to provide an ultra-small and conveniently portable microphone with narrow angle directivity using a plurality of element microphones with good frequency characteristics.

Next, embodiments of the present invention will be described with reference to the drawings.

The embodiment of the present invention is made up of cylindrical bodies 5 and 6 of different diameters, which are provided with a large number of sound wave penetration holes 4 on the outer periphery, as shown in Figs. 2 to 4, and enlarged as shown in Fig. 2'. As shown in FIG.
The protrusion 6' is engaged with the groove 5', and the primary sound pressure gradient element microphones 7, 8 are coaxially disposed inside the front end of the cylindrical body 5 and the rear inside of the cylindrical body 6 in the distal direction. is fixed, and a delay circuit network 9 is connected to the output cord 10 to form a secondary sound pressure gradient type microphone.

When not in use, as shown in FIG. 4, the cylindrical bodies 5 and 6 overlap each other to shorten the overall length, making it extremely compact.

As described above, according to the present invention, a compact narrow-angle directional microphone with extremely good performance and convenient portability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of a secondary sound pressure gradient type microphone. 2 to 4 relate to an embodiment of the present invention, in which FIG. 2 is a sectional view and FIG. 2' is an enlarged view of the main part of FIG. 2. FIG. 3 is an external perspective view of FIG. 2. FIG. 4 is a perspective view of the device shortened for portability. 1, 2...unidirectional microphone, 3...
... Delay circuit network, 4 ... Sound wave penetration hole, 5, 6
...Cylindrical body, 5'...Groove, 6'...
... Protrusion, 7, 8 ... Primary sound pressure gradient element microphone, 9 ... Delay circuit network, 10 ...
...Output code.

Claims (1)

[Scope of utility model registration request] A plurality of cylindrical bodies having a number of sound wave penetration holes on the outer periphery and having slightly different diameters are provided with means for sliding and connecting each other with the same center line and overlapping each other, and One primary tilt element microphone is fixed coaxially toward the tip inside the tip and rear ends of the cylindrical body, and a delay network is connected to the output cord to create a secondary A small, narrow-angle directional microphone that functions as a sound pressure gradient directional microphone, and can be shortened as a whole by increasing the overlap of the plurality of cylindrical bodies.