JPH0479598A - Microphone with two-way directivity - Google Patents

Abstract

PURPOSE:To prevent howling from occurring when a microphone is used as part of a PA system by performing the circuit connection of a microphone with directivity for low-pitched sound area and a microphone with line type directivity for high-pitched sound area by a network. CONSTITUTION:The microphone 4 with directivity for low-pitched sound area is unified with the microphone 6 with line type directivity for high-pitched sound area by performing the circuit connection of the microphone 4 with directivity for low-pitched sound area and the microphone 65 with line type directivity for high-pitched sound area in which the directivity characteristic of a high-pitched frequency sound part is improved. In other words, directivity from a low-pitched sound area to a high-pitched sound area can be improved by connecting the microphone 4 with sperior directivity from the low-pitched sound area to a middle-pitched sound area to the microphone 6 with line type directivity with sperior directivity for the high-pitched sound area via the high- pass filter 17 of the network. In such a way, it is possible to prevent howling occurrence when the microphone is used as part of the PA system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a two-way directional microphone primarily used for speech amplification.

BACKGROUND ART FIG. 6 shows a side sectional view of a conventional directional microphone, in which a microphone unit I.23 is fixed to a microphone body case 24, and a front case 25 and a front neck [-
26, and the output of the microphone 22 is connected by a lead wire 27 to an output connector 28 fixed to the microphone body case 24.

Problem to be Solved by the Invention However, in the output frequency characteristics shown in FIG. (4 to 10 KHz) is close to the output frequency characteristic of 30 for the sound pressure from the front direction of the microphone, and when such a microphone is used as part of a public address system, howling in the high frequency range will occur. It has the disadvantage that it is easy to occur.

It is an object of the present invention to eliminate such drawbacks and to obtain a two-way directional microphone that is less likely to cause howling when used as part of a public address system □.

Means for Solving the Problems In order to achieve the second object, the present invention provides a directional microphone for the low frequency range and a line-type directional microphone for the high frequency range with good directional characteristics in the high frequency range in a network. This is a combination of a directional microphone for the low frequency range and a line type directional microphone for the high frequency range by making cross-circuit connections.

Operation The present invention has the following effects due to the configuration as described in section 2. In other words, by connecting a directional microphone with good directivity in the low to midrange range through a low-pass filter in the network, and a line-type directional microphone with good directivity in the high range through a bypass filter in the network, it is possible to Directional characteristics can be improved from the sound range to the treble range 1.

Embodiment FIG. 1 shows the configuration of an embodiment of a two-way directional microphone according to the present invention. In the figure, 1 is the main case of the microphone, 2 is the front case of the directional microphone for bass range, 3 is the front net attached to the front case 2, and 4 is the front of the main body case 1 of the microphone and the directional microphone for bass range. The directional microphone outputs 1-15 held and fixed by the case 2 are the front case of the line-type directional microphone for high-frequency range, 6 is the line-type microphone unit for high-frequency range, 7 is the acoustic tube, and 8 is the acoustic tube 7. 9 is the outer case, 1o is the front ring that fixes the acoustic tube 8 and the outer case 9, 11 is the front net that is attached to the front ring 10, 12 and 1 are
3 is a lead wire. 14 is the microphone main case 1
As shown in Fig. 2, the directional microphone unit 1-4 is connected to a robust filter 16, and the line-type directional microphone unit 1-61/C is connected to the high-frequency range directional microphone unit 1-6. It consists of a bypass filter. 16 is an output connector fixed to the microphone body case 1.

In this case, the directional microphone for low frequency range has an output frequency characteristic 18 shown in FIG.
By applying the low-pass filter 16 of 4, the output frequency characteristic becomes 19, which is obtained as an output only in the frequency range with excellent directional characteristics. 20, but the bypass filter 1 of the network 14
7, the output frequency characteristic 21 is obtained, which is obtained as an output only in a frequency range with excellent finger grip, and by connecting the outputs of both microphones to a circuit, the output frequency characteristic 22 shown in FIG. 5 is obtained. Therefore, an integrated two-way directional microphone with excellent directional characteristics over the entire frequency range of the microphone output can be obtained.

Effects of the Invention As is clear from the above embodiments, the present invention is a 2-way microphone in which the directional characteristics are distorted over the entire frequency range of the microphone output, and when used as part of a public address system, noise is less likely to occur. It is possible to realize a directional microphone.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a two-way directional microphone according to an embodiment of the present invention, Fig. 2 is a connection circuit diagram of the network section in the configuration of Fig. 1, and Fig. 3 is a low frequency range used in the present invention. Output frequency characteristic diagram of directional microphone for use, Part 4
The figure is an output frequency characteristic diagram of the line-type directional microphone for high frequency range used in the present invention, Figure 5 is a composite output frequency characteristic diagram of the two-way directional microphone according to the present invention, and Figure 6 is a diagram of the combined output frequency characteristic of the 2-way directional microphone according to the present invention.
The figure is a side sectional view of a conventional directional microphone, and FIG. 7 is a four-temperature diagram of the output frequency of the directional microphone shown in FIG.

Claims (1)

[Claims] A 2-way directional microphone that connects a directional microphone for low frequencies and a line-type directional microphone for high frequencies through a network.