JPS6038919B2 - wireless microphone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless microphone using an electret condenser microphone, and an object of the present invention is to enable it to be used as a wired microphone with a simple configuration.

In general, wireless microphones using electret condenser microphone units that are configured so that they can also be used as wired microphones are well known.

Figure 1 is an electrical wiring diagram of this type of wireless microphone, in which 1 is an electric condenser microphone, 2 is a modulator that FM modulates the carrier wave with the audio signal obtained by the microphone, and 3 is a battery. , 4 is a jack with 6 contacts a, b, c, d, e, f, 5 is FM
An antenna transmitting a modulated signal, S, , S2 are mutually interlocking switches, and C, , C2, C3 are coupling capacitors. In the conventional wireless microphone shown in FIG. , S2 is turned on, battery 3
A voltage of The contact d is in contact with the contact e.

Therefore, the audio signal obtained by the microphone unit 1 is only applied to the modulator 2 via the capacitor C, switch S, and the signal modulated here is transmitted to the antenna 5 via the capacitor C2. . Therefore, in this case, it functions as a so-called wireless microphone. Now if you insert a plug into jack 4, contact B
and contact point c are separated, and contact point e comes into contact with point f.

Therefore, in this case, the audio signal obtained by the microphone unit 1 is applied to the modulator 2 via the capacitor C and the switch S, and at the same time, the plug inserted into the jack 4 is applied via the contact c of the jack 4. is applied to Therefore, in this case, it acts as a so-called wired microphone. In this case, the signal modulated by the modulator 2 is grounded via the capacitor C2, contacts e and f of the jack 4, and the capacitor C3, and no radio waves are emitted from the antenna 5. . In this way, even the conventional wireless microphone shown in FIG. 1 can be used as a wired microphone.

However, in this type of device, switching between use as a wireless microphone and use as a wired microphone is performed using a six-contact jack with a large number of circuits, which has the problem of increasing costs. Furthermore, this type of device has the problem that the modulator 2 remains in operation even when used as a wired microphone, which is disadvantageous in terms of power consumption. The present invention eliminates the above-mentioned drawbacks of the conventional circuit, and has a structure that simplifies the overall circuit structure and is extremely advantageous in terms of power consumption.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The wireless microphone of the present invention will be described below with reference to drawings of one embodiment.

FIG. 2 is an electrical connection diagram of an embodiment of the wireless microphone of the present invention, and the same reference numerals as in FIG. 1 indicate the same components as in FIG. 1. In Fig. 2, 6 is a jack having three contacts a, b, and c;
L,. L2 is a coil that presents a high impedance to modulated signals and a very low impedance to DC and audio signals. In FIG. 2, when the plug is not inserted into the jack 6, it is in contact with the contact c.

Therefore, if the switches S, , S2 are turned on now, the microphone unit 1 is connected directly via the switch S2, and the modulator 2 is connected to the switch S2, the coil L2, the contacts c and b of the jack 6, the coil L. The voltage of the battery 3 will be applied via. The audio signal obtained by the microphone unit 1 is then applied to the modulator 2 via the capacitor C, switch S, and the modulated signal is sent to the modulator 2 via the capacitor C.
2 to the antenna 5. Therefore, in this case it can be used as a so-called wireless microphone. Now, if a plug is inserted into the jack 6, the contact c of the jack 6 will be separated from the contact b, so the power line to the modulator 2 will be turned off, and the modulator 2 will be completely inactive.

The audio signal from the microphone unit 1 is transmitted to the contact a of the jack 6 via the capacitor C and the switch S, and is then transmitted to the plug inserted into the jack 6. Therefore, in this case, it can be used as a so-called wired microphone. In this case, the manner in which the jack 6 is used is opposite to the normal manner in which the contact a is the signal terminal and the contact c is the ground terminal, but there is no problem if a dedicated plug and cord are prepared. In addition, in the embodiment, a part of the power supply line of the modulator 2 is shared as part of the line from the output end of the modulator 2 to the antenna 5, but as shown in FIG. It is also possible to provide one. If a line from the output end of the modulator 2 to the antenna 5 is provided independently as shown in FIG. 3, the coils L and L2 can be omitted. As shown in FIG. 2, the antenna 5 is connected from the output end of the modulator 2 to the
There are the following advantages when the line leading to the line is shared with part of the power supply line. In other words, when configuring these wireless microphones, the jack 6 and antenna 5 are usually attached to one side of the case, and the microphone and other electrical circuits are often housed on the other side with the battery 3 in between. It is advantageous to have fewer wires leading to the jack 6 and antenna 5 than to the circuit. However, in the embodiment shown in FIG. 3, at least four wires are required, but in the embodiment shown in FIG. 2, three wires are sufficient, which is more advantageous in terms of wiring. As is clear from the above embodiments, the wireless microphone of the present invention is configured so that battery voltage is applied to the modulator through contacts that separate when a plug is inserted into the jack, and the jack has three contacts. It is extremely advantageous in terms of power consumption, since the modulator itself can be powered off when used as a wired microphone.

[Brief explanation of the drawing]

Fig. 1 is an electrical wiring diagram of a conventional wireless microphone, Fig. 2 is an electrical wiring diagram of one embodiment of the wireless microphone of the present invention, and Fig. 3 is an electrical wiring diagram of main parts of another embodiment. . 1...Microphone unit, 2...Modulator, 3...
...Battery, 5...Antenna, 6...Shirt evening. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The audio signal obtained by the microphone unit is modulated by a modulator and emitted as a radio wave from the antenna, and the output jack is always connected to the first contact of which the output of the microphone unit is applied. A jack having second and third contacts that are in contact with each other and separate from each other when the plug is inserted is used, and the second contact of this jack is connected to the ground power terminal of the microphone unit, and the third contact is connected to the ground power terminal of the microphone unit. A contact is connected to the ground power terminal of the modulator, and the supply of power voltage to the modulator is interrupted through these second and third contacts, so that when the jack plug is inserted, power is supplied to the modulator. A wireless microphone configured such that no voltage is applied and the output of the microphone unit is directly transmitted to the plug via the first contact of the jack.