JPH11215063A - Wireless microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the increase of power consumption since a plurality of infrared-ray emitting elements are provided at a plurality of places and to prolong the life time of a battery by providing the infrared-ray emitting elements in a plurality of places in a microphone main body, and selecting one place from among the plurality of places so as to have light emitted. SOLUTION: An upper light-emitting part 4 and a lower light-emitting part 4 are provided integrally to a main body 2 and a head part 5 is provided above the upper light-emitting part 3. Two electrode lines 6 as detectors are provided in places close to the lower light-emitting part 4 in the main body 2 by leaving a small interval. The two electrode lines 6 output detection signals by the change of impedance and the change of capacitance, when they are grasped at the same time. When a user holds the main body 2 and sings, infrared rays are emitted only from the lower light-emitting part 4. When the user grasps the part of the lower light-emitting part 4 at starting use or during use, the two electrode lines 6 output detection signals, and the radiation of the infrared rays from the lower light-emitting part 4 is stopped. Then, the infrared rays are radiated from the upper light-emitting part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless microphone used for karaoke and the like.

[0002]

2. Description of the Related Art Microphones used for karaoke or the like have conventionally been connected to an amplifier by a cord. However, if a cord is used, the distance used by the microphone is restricted by the length of the cord. Will be longer. Longer cords can get in the way during use and can be more difficult to store. Therefore, cordless conversion will progress. An orthodox type of cordless microphone used in this way is a radio type using an FM wave.

According to a system in which a carrier is frequency-modulated with an audio signal and the carrier is radiated as radio waves from an antenna, there is no need to connect the microphone and the amplifier with a cord. Such a problem will not occur. However, when such radio waves are used, it is necessary to consider interference with other radio waves. This is especially true where many karaoke facilities are provided adjacent to each other, such as a so-called karaoke box.

[0004] Naturally, in adjacent equipment, interference is prevented by changing the frequency. However, since the radio waves pass through the house structure, they may pick up radio waves from unexpected places, which may cause interference. Therefore, instead of using radio waves, optical communication will be used. A basic optical communication system uses infrared light. In this method, a lighting signal of a light emitting diode as an infrared light emitting element is modulated by an audio signal, and a change in the amount of infrared light generated thereby is used as a signal. The receiving side receives infrared rays by a light receiving element such as a phototransistor and demodulates the received signal to obtain an audio signal.

[0005] Since infrared light is a light ray, it does not pass through the house building and is therefore very advantageous against interference. However, there is a problem caused by light rays. That is, when the light emitting diode is attached to the microphone body, the user of the microphone only has to grip the part without the light emitting diode. The sound will be interrupted. In consideration of such a situation, it is conceivable that light emitting diodes are provided at a plurality of different places (generally, two places) of the microphone body, and the light emitting diodes are actually used.

[0006] This is because light emitting diodes are provided near the head of the microphone body (boundary portion with the windshield) and at the lower end (the side opposite to the windshield), and the user uses one of them to hold one of the hands. When the emission of the light beam is cut off, communication is performed by infrared rays emitted by the other light emitting diode. For this reason, both of the light emitting diodes at a plurality of locations always emit light, resulting in wasteful power consumption.

[0007] On the other hand, another problem is that an infrared wireless microphone, which is widely used at present, requires an increase in the number of light emitting diodes or an increase in current flowing through the light emitting diodes in order to extend the reach of light rays. Is commonly done. In this case, the reach of the light beam is extended and the usability is improved. However, whichever method is used, there is a problem that the power consumption is increased and the use time of the battery is shortened. In order to solve this problem, it is conceivable that a current is supplied to the light emitting diode only when the microphone is used, and the current is stopped in a standby state.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above two problems at the same time, namely, an increase in power consumption caused by providing a plurality of light emitting diodes and an increase in power consumption to extend the reach of light rays. It is an object of the present invention to provide a wireless microphone that can extend the life of a battery serving as a power supply.

[0009]

According to the present invention, as a means for solving the above-mentioned problems, according to the first aspect of the present invention, a sound output signal of a microphone unit built in a microphone body is frequency-modulated. Controlling the light emission of the infrared light-emitting element, and transmitting a signal to a remote point by the light emission of the infrared light, the infrared light-emitting element is disposed at a plurality of locations of the microphone body, and It is characterized in that one portion is selected to emit light.

According to a second aspect of the present invention, in the first aspect, when one of the light emitting portions of the microphone body is in a light-shielded state, the infrared light emitting elements at the other portion emit light. In this way, a plurality of infrared light emitting elements are selected.

According to the third aspect of the present invention, the sound output signal of the microphone unit built in the microphone body is frequency-modulated to control the light emission of the infrared light emitting element. In the wireless microphone described above, the power supply to the drive circuit of the infrared light emitting element is controlled irrespective of whether or not the microphone body is gripped.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the control of energizing the drive circuit of the infrared light emitting element is energizing or interrupting a current.

According to a fifth aspect of the present invention, in the third aspect, the detector for detecting whether or not the microphone main body is gripped detects a change in impedance or capacitance caused by an electrode wire or an electrode plate. It is characterized by detecting.

According to the first and second aspects of the present invention, when one of the light-emitting portions of the microphone body is covered from the outside and is in a light-shielded state, the infrared light-emitting element at another location is selected to emit light. Therefore, light emission is always performed based on one of the plurality of light emitting units, and the other light emitting diode emits light only when necessary, as in the temporary use. According to the inventions described in claims 3 and 4, the light emitting diode is energized only when the user grips the microphone body. Furthermore, in the invention described in claim 5, since the detector detects a change in impedance or capacitance, there is no movable part, and the operation is stable and reliable.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention corresponding to claims 1 and 2 will be described with reference to FIG. A wireless microphone 1 uses an infrared light emitting diode. This wireless microphone 1
Is a net that covers the microphone unit above the upper light-emitting unit 3 by integrally providing the upper light-emitting unit 3 and the lower light-emitting unit 4 in a cylindrical main body 2 containing an amplifier, a modulation circuit, a rechargeable battery, and the like. Is provided.

The upper light emitting section 3 and the lower light emitting section 4 are made of a synthetic resin that transmits infrared rays, and form an external part of the main body 2. In the portion of the main body 2 close to the lower light emitting section 4, two electrode wires 6 as detectors are provided at a slight interval. The two electrode wires 6 generate an electrical output signal due to a change in impedance, a change in capacitance, etc. when the two electrode wires 6 are grasped simultaneously. Reference numeral 7 denotes a power switch provided on the main body 2.

FIG. 2 shows a lighting circuit of a light emitting diode which emits infrared light and is provided inside the upper light emitting section 3 and the lower light emitting section 4. In this circuit, 8 is a microphone unit, and 9 is a modulator for frequency-modulating the audio current of the microphone unit 8. The output side of the modulator 9 is connected to the input side of two amplifiers 10 and 11 so as to amplify the frequency-modulated signal.

The output side of the amplifier 10 is connected to a light emitting diode 1 that emits infrared light through an upper LED driver circuit 12.
3 is connected. The output side of the amplifier 11 is connected to a light emitting diode 15 that emits infrared light via a lower LED driver circuit 14. In this circuit, the modulator 9, the amplifiers 10, 11 and the upper and lower LEDs
When the current from the power supply circuit 16 is supplied to the driver circuits 12 and 14, the audio current of the microphone unit 8 is frequency-modulated to cause the light emitting diodes 13 and 15 to blink.

The power supply terminal is not shown because the power supply current is always supplied to the modulator 9. However, the amplifiers 10 and 11 which are controlled to supply and cut off the power supply current and the upper and lower LED driver circuits 12 according to the present invention. , 14 are provided with power terminals 10 a, 11 a, 12 a and 14 a, respectively.
7c. The switching circuit 17 has a power terminal 17a connected to the power circuit 16, and a control terminal 17d.

Reference numeral 18 denotes a detector, which is composed of the two electrode wires 6 described above. The output of the detector 18 is connected to a switching circuit 17 via an amplifier 19.
Is connected to the control terminal 17d. With this connection, the switching circuit 17 causes the switching circuit 17 to function when the detector 18 emits an output signal.
The switching circuit 17 in this embodiment always outputs the power supply voltage only to the output terminal 17b, and when a signal is input to the control terminal 17d, the output terminal 17b
Is stopped to output the power supply voltage to the output terminal 17c.

In the wireless microphone 1 thus configured, when the user sings while holding the main body 2, the circuit of the light emitting diode 15 functions by the function of the switching circuit 17, and infrared light is emitted only from the lower light emitting section 4. Radiated. This is because the voltage from the power supply circuit 16 is output only to the output terminal 17b in the circuit of FIG. At this time, since the power supply voltage is not supplied to the amplifier 10 and the upper LED driver circuit 12, the upper light emitting unit 3 does not function.

If the user of the microphone grasps the lower light emitting section 4 at the start of use or during use, infrared rays from the lower light emitting section 4 are blocked by hand and do not reach the light receiving section. A detector 18 is provided near the lower light emitting unit 4.
Therefore, at this time, the detector 18 is simultaneously grasped, and the detector 18 outputs a detection signal. This signal is amplified by the amplifier 19 to a sufficient level, and is input to the control terminal 17d of the switching circuit 17. The switching circuit 17 is thereby connected to the output terminal 1 until then.
The output from the terminal 7b is switched to the output terminal 17c and output. Therefore, the light emitting diode 13 is turned on and the upper light emitting unit 3 functions.

Next, a third embodiment of the present invention will be described with reference to FIGS. The wireless microphone 1 is provided with an electrode plate 6A having a thin insulating film on a main body 2 portion, and when the electrode plate 6A portion is grasped by a hand, a change in capacitance of the electrode plate 6A causes some electric power. A target output signal is generated to detect whether the user has gripped the main body 2 or not.

The circuit shown in FIG. 4 is different from the one shown in FIG. 2 in that the usage of the switching circuit 17 is changed so that there is no output at all times between the two output terminals and only when the detector 18 emits an output signal. An output terminal 17c for generating an output voltage is used. This output terminal 17c is connected to the amplifier 10,
11 power terminals 10a, 11a and upper and lower LEDs
The power supply terminals 12a and 14a of the driver circuits 12 and 14 are connected. According to this embodiment, the impedance or capacitance changes only when the main body 2 is gripped to sing karaoke, and as a result, the amplifiers 10, 1
Since the power supply voltage is applied to the wireless microphone 1 and the like, when the wireless microphone 1 is placed on a table or the like as in a standby state, the power is turned off and power can be saved.

In the above embodiment, in the case of using two electrode wires, the change in impedance, the change in capacitance, etc. between the two electrode wires when the portion is grasped by hand is captured. A single electrode wire may be used to catch the change between the electrode wire and the case body.
When the case body is made of metal, the case body may be used as an electrode. Further, a light receiving element is arranged near the light emitting diode constituting the lower light emitting section, and when the lower light emitting section is grasped by hand, the light beam is reflected by the palm and received by the light receiving element, and the output signal is taken. It is also conceivable to do so.

[0026]

Since the present invention is a wireless microphone configured as described above, according to the first and second aspects of the present invention, one of the light emitting portions of the microphone body is covered from the outside. When the light-shielded state is reached, the infrared light emitting elements at other places emit light, so that power consumption can be reduced as compared with a type in which current is continuously supplied to two light emitting diodes. Further, according to the third and fourth aspects of the present invention, power is supplied to the amplifier and the like only when the microphone is gripped for use, so that unnecessary power consumption during standby is not required. Will be. Furthermore, according to the invention described in claim 5, since there is no movable part, a stable operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of the present invention.

FIG. 2 is a circuit diagram of that of FIG.

FIG. 3 is a front view showing another example of the embodiment of the present invention.

FIG. 4 is a circuit diagram of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wireless microphone 2 Main body 3 Upper light-emitting part 4 Lower light-emitting part 6 Electrode wire 6A electrode plate 8 Microphone unit 9 Modulator 10 Amplifier 11 Amplifier 12 Upper LED driver circuit 13 Light emitting diode 14 Lower LED driver circuit 15 Light emitting diode 16 Power supply circuit 17 Switching Circuit 18 Detector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04R 3/00 320

Claims (5)

[Claims] 1. A wireless microphone in which an audio output signal of a microphone unit built in a microphone body is frequency-modulated to control light emission of an infrared light emitting element, and a signal is transmitted to a remote place by the light emission of the infrared light. A wireless microphone, wherein the infrared light emitting elements are arranged at a plurality of locations of a microphone body, and one of the plurality of locations is selected to emit light. 2. The method according to claim 1, wherein when one of the light emitting units of the microphone body is in a light-shielded state, a plurality of infrared light emitting elements are selected so that infrared light emitting elements in other places emit light. The wireless microphone according to claim 1, wherein 3. A wireless microphone in which a sound output signal of a microphone unit built in a microphone body is frequency-modulated to control light emission of an infrared light emitting element, and a signal is transmitted to a remote point by the light emission of the infrared light. A wireless microphone, characterized in that power supply to a drive circuit of the infrared light emitting element is controlled irrespective of whether or not the microphone body is gripped. 4. The wireless microphone according to claim 3, wherein the control of energization of the drive circuit of the infrared light emitting element is energization or interruption of current. 5. The wireless microphone according to claim 3, wherein the detector for detecting whether or not the microphone body is gripped detects a change in impedance or capacitance due to an electrode wire or an electrode plate.