JP2004289453A - Wireless microphone system, receiver, wireless microphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless microphone system comprising a receiver capable of simultaneously receiving a plurality of channels, and a plurality of microphones, that can prevent a crosstalk between systems and automatically set a transmission channel of the microphone in matching with the receiver whose reception channel is unknown, in a short time. <P>SOLUTION: The wireless microphone system comprises: the receiver provided with a plurality of reception circuit means respectively corresponding to a plurality of different bands receptible at the same time and with a channel instruction means for wirelessly transmitting a channel instruciton signal for instructing one channel among a plurality of receptible channels by each reception circuit means to surroundings; and a plurality of wireless microphones each being adapted to any of a plurality of bands of the receiver, whose outward appearance differs from the adapted band and provided with a channel switching means for receiving the channel instruction signal from the receiver and selecting a channel among a plurality of transmission available channels. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless microphone system, and more specifically, to a wireless microphone system having a function of automatically setting a transmission channel of a wireless microphone in accordance with a reception channel of a receiver.
[0002]
[Prior art]
The wireless microphone system includes a receiver and a wireless microphone. Wireless microphone systems include an infrared system and a radio system. The difference between these systems lies in whether the modulated signal of the voice input to the microphone is transported using infrared rays or radio waves, and both types transmit and receive FM-modulated voice signals. .
[0003]
In the radio wave system, interference may occur if a plurality of systems are installed close to each other. Therefore, it is necessary to set different setting channels for a receiver and a microphone in each system. On the other hand, the infrared system has no possibility of interference unless the receiver and the wireless microphone have a positional relationship that can be seen. However, the carrier frequency in each system is generally 2 to 4 MHz for the infrared system and about 800 MHz for the radio system. Therefore, the radio wave type has a wider band and has better sound quality. In addition, in order to prevent interference between a plurality of systems, there is a wireless microphone system in which transmission and reception between a wireless microphone and a receiver are repeated for each channel to scan and specify an empty channel, and the channel is automatically set (for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-6-326621 [0005]
[Problems to be solved by the invention]
A karaoke device is well known as a device equipped with a wireless microphone system. As described above, the radio-type wireless microphone system is superior to the infrared type in terms of sound quality. Therefore, it is desirable to equip the karaoke apparatus with the radio-type wireless system in applications where sound quality is important, such as karaoke. However, in a store configuration in which a karaoke device is installed in each of a plurality of guest rooms such as a karaoke box, there is a possibility that the sound of a microphone in another guest room may be mixed into the karaoke device in an adjacent room. Therefore, channels used by the wireless microphone system in each guest room are strictly controlled. In addition, a wireless microphone system for a karaoke device is provided with two microphones that can be used simultaneously for a duet, and the karaoke device itself has a transmission channel so that these two microphones do not interfere with each other. A receiver in which two systems of receiving / demodulating circuits are mounted so that modulated voice signals from two different wireless microphones can be simultaneously received and demodulated.
[0006]
A major problem of the wireless microphone system applied to the karaoke apparatus is that channels are set almost fixedly for each system. That is, when a microphone for a certain karaoke apparatus is replaced with another microphone due to a failure or the like, the receiving channel of the receiver is checked and it is checked which microphone is to be replaced. Then, the transmission channel of the microphone is set correctly. This work is extremely complicated, and the work cannot be performed by the user. Even if the karaoke apparatus is equipped with the wireless microphone system described in JP-A-6-326621, it takes time to scan an available channel, and the wireless microphone system itself is expensive. Therefore, the karaoke apparatus is often equipped with an infrared wireless microphone system.
[0007]
The present invention includes a receiver capable of receiving signals on a plurality of channels and a plurality of microphones corresponding to the respective channels, and also supports a usage pattern in which a plurality of systems are installed in close proximity, so that the method can be performed easily and quickly. It is an object of the present invention to provide an inexpensive wireless microphone system that can automatically set a transmission channel of a microphone according to a receiver whose reception channel is unknown.
[0008]
[Means for Solving the Problems]
The present invention is a wireless microphone system including a receiver and a plurality of wireless microphones, wherein the receiver includes a plurality of reception circuit units respectively corresponding to a plurality of different bands that can be simultaneously received, and a plurality of reception circuit units. Channel indication means for wirelessly transmitting a channel indication signal indicating one of the receivable channels to the vicinity, wherein each of the plurality of wireless microphones is adapted to one of a plurality of bands in the receiver. The appearance differs depending on the adaptation band, and a channel switching means for receiving a channel instruction signal from a receiver and selecting one of a plurality of transmittable channels is provided.
[0009]
Further, the receiver constituting the wireless microphone system is also within the scope of the present invention, and includes a plurality of receiving circuit means respectively corresponding to a plurality of different bands that can be simultaneously received, and a plurality of receivable channels in each receiving circuit means. And a channel instructing means for wirelessly transmitting a channel instruction signal for instructing one channel to the vicinity.
[0010]
In the receiver, the channel setting means may select the channels of the respective receiving circuit means collectively by one system of selection means.
[0011]
The present invention also extends to the wireless microphone constituting the wireless microphone system, wherein a different appearance element for each compatible band and one channel out of a plurality of transmittable channels by receiving a channel instruction signal from a receiver. And a channel switching means for selecting
[0012]
In this wireless microphone, the channel switching unit may receive the channel instruction signal for a predetermined period after turning on the power, select one channel, and suspend the operation of receiving the channel instruction signal.
[0013]
Further, the channel switching means may receive the channel instruction signal for a predetermined period and select one channel every time a predetermined user input is received.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
=== Example of wireless microphone system installation ===
The wireless microphone system of the present invention is provided in a karaoke device or the like, and can be applied to a store or the like in which a karaoke device is installed in each of a plurality of guest rooms. Here, it is assumed that a plurality of wireless microphone systems are installed in a plurality of independent rooms and the rooms are close to each other.
[0015]
Under this assumption, a channel setting method of the wireless microphone system in the embodiment of the present invention will be described. The wireless microphone system according to the present embodiment includes a receiver capable of simultaneously receiving two specific bands and two wireless microphones adapted to each of the two bands. In other words, the two wireless microphones are configured to be compatible with different bands and cannot transmit on a channel belonging to the other band. Also, it is assumed that the reception channel of the receiver is set in advance so that the same band is not set to the same channel in a plurality of wireless microphone systems.
[0016]
FIG. 1 shows an example of setting a band and a channel in each wireless microphone system. In this example, five sets of wireless microphone systems (A to E) are installed, and each wireless microphone system uses two specific bands a and b and five channels 1 to 5 for each band. Can be done. Therefore, the frequency used by the system is determined by the combination of the band and the channel. That is, interference does not occur unless the same combination exists. Note that a band is a group of channels set so that the frequency of a channel belonging to a certain band and the frequency of a channel belonging to another band do not overlap each other including the band, and may not be within a predetermined frequency range.
[0017]
=== Specification of wireless microphone band ===
In a wireless microphone system installed in karaoke equipment, etc., once the receiver's reception band and reception channel were set at the beginning of installation, the combination of the band and channel was not changed and was set almost fixed Will remain. In such an installation mode, for example, it is assumed that a wireless microphone corresponding to one band has failed. In this case, it is necessary to know whether the band corresponding to the failed microphone is a or b. Therefore, the appearance of the wireless microphone is changed according to each band of a and b. FIG. 2 shows an external view of a wireless microphone in the wireless microphone system of the present embodiment. A power switch 21 and a button (channel setting button) 22 for setting a transmission channel are arranged on the grip 24 of the microphone 2. In the present embodiment, a tape 23 of a different color is applied to the grip 24 in accordance with its own compatible band. Of course, it suffices if the appearance characteristics differ depending on the appropriate band, such as clearly indicating the shape of the microphone itself or "a" and "b" and the band itself.
[0018]
=== Wireless microphone system channel setting ===
Next, even if the band of the wireless microphone to be replaced can be known, the transmission channel cannot be matched unless the reception channel of the receiver of the transmission partner can be known. In addition, if the method of setting the transmission channel is complicated, the user cannot tune the channel correctly. The wireless microphone system of this embodiment has a function of automatically and correctly setting the transmission channel of the wireless microphone even if the reception channel of the receiver is not known.
[0019]
3A and 3B are functional block diagrams of a receiver and a wireless microphone in a wireless microphone system, respectively. The receiver 1 is totally controlled by using the receiver control unit 11 as a main control unit. In addition, two reception processing systems 12a and 12b are provided corresponding to the two bands, and each of the reception circuits 12a and 12b has a certain band introduced via an antenna 13 similarly to a conventional receiver. It tunes to the channel (carrier frequency) and detects the carrier to demodulate the modulated audio signal. Then, the audio signal is amplified and output to an external audio device.
[0020]
The operation panel 14 receives a setting input of a receiving channel in each band. The operation control unit 15 passes information corresponding to an operation input to the operation panel 14 to the receiver control unit 11. The receiver control unit 11 changes the tuning frequency according to the set reception channel of each band.
[0021]
Further, each time the channel of each band is changed and set, the receiver control unit 11 generates a code including information on a combination of the band and the channel. Then, the code is given to the LED drive control unit 16. The LED drive control unit 16 includes a storage unit for the code and a drive circuit for the LED, reads the code sequentially, and drives the LED 17 with a modulation signal corresponding to the code. That is, the transmission of the infrared signal including the instruction information of the band and the channel is continued.
[0022]
On the other hand, the wireless microphone 2 is controlled and controlled by using the microphone control unit 25 as a main control unit. The modulator 28 includes a PLL and a VCO, and the microphone controller 25 controls the PLL to oscillate at a frequency corresponding to a transmission channel. The sound input to the pickup 26 is subjected to acoustoelectric conversion, and is amplified by the sound signal amplifier 27. The modulator 28 modulates the signal of the oscillation frequency with the amplified audio signal. This modulated voice signal is amplified by the transmission radio wave amplifier 29 and transmitted from the antenna 30 as a modulation radio wave.
[0023]
Further, the wireless microphone 2 has a function of automatically setting a transmission channel according to a combination of a reception band and a reception channel of the receiver 1. When the channel setting button 22 is pressed while the power is turned on, the microphone control unit 25 activates the infrared signal reception control unit 31. The light receiving unit 32 receives an infrared channel instruction signal constantly transmitted from the receiver 1 and converts it into an electric signal. The infrared signal reception control unit 31 decodes the code from the electric signal and transfers it to the microphone control unit 25. When confirming that the information of the band included in the code is the band corresponding to the microphone itself, the microphone control unit 25 controls the modulation unit 28 using the channel included in the code as the transmission frequency. Thereby, the transmission channel is automatically set. When the automatic setting is completed, the operation of the infrared signal reception control unit 31 is stopped to save power consumption. Of course, the setting operation of the transmission channel may be always performed when the power is on, or the infrared signal from the receiver may be received every predetermined period. Of course, it is also possible to set the transmission channel by receiving the channel instruction signal for a predetermined period from the time when the power is turned on, and to suspend the reception operation after the setting is completed.
[0024]
=== Setting of the receiving channel in the receiver ===
The receiver is configured to select and set a reception channel for each of a plurality of bands capable of simultaneous reception. Of course, the selection input of the reception channel may be received for each band, but the selection operation is required for the number of bands. Further, the combination of the reception channels is arbitrary between the bands, and may be the same as the combination of the band and the reception channel selected by another system nearby.
[0025]
Therefore, if a combination of channels is determined in advance for the reception channel selected corresponding to each band and the combination is designated, one operation can be performed without setting the reception channel for each band. The reception channels of each band can be selected collectively. Also, among a plurality of systems, interference can be prevented only by using different combinations of reception channels without considering the selection status of reception channels for each band.
[0026]
=== Information transmission of band and channel ===
In the above embodiment, the information of the receiving band and the receiving channel of the receiver is transmitted to the wireless microphone by the infrared signal. Not limited to this example, other short-range wireless communication systems such as Bluetooth (registered trademark) can be adopted.
[0027]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the wireless microphone system of this invention, it respond | corresponds to the system structure containing the receiver which can receive on a some channel, and the some microphone corresponding to each channel, and can match with the receiver which does not understand a receiving channel easily and in a short time. Automatically select the microphone transmission channel. Further, the system itself can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a channel setting state of a wireless microphone system according to an embodiment of the present invention.
FIG. 2 is an external view of a wireless microphone included in the wireless microphone system.
FIG. 3 is a configuration diagram of the wireless microphone system, wherein (A) and (B) are a functional block diagram of a receiver and a functional block diagram of a wireless microphone, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receiver 2 Wireless microphone 11 Receiver control parts 12a and 12b Receiving circuit 17 LED
23 Applicable band instruction tape 25 Microphone control unit 31 Infrared signal reception control unit 32 Light receiving unit

Claims (6)

A wireless microphone system including a receiver and a plurality of wireless microphones,
The receiver includes a plurality of receiving circuit means respectively corresponding to a plurality of different bands that can be simultaneously received, a channel setting means for selecting one channel from a plurality of receivable channels in each receiving circuit means, and a channel setting means. Channel indication means for wirelessly transmitting a channel indication signal indicating the selected channel to the vicinity,
The plurality of wireless microphones each match one of a plurality of bands in the receiver, and have different appearances according to the matching bands, and receive a channel indication signal from the receiver to select one of the plurality of transmittable channels. Equipped with a channel switching means for selecting,
A wireless microphone system, characterized in that: The receiver constituting the wireless microphone system according to claim 1, wherein a plurality of reception circuit means respectively corresponding to a plurality of different bands that can be simultaneously received, and a plurality of receivable channels in each reception circuit means. A receiver comprising: channel setting means for selecting one channel; and channel instruction means for transmitting a channel instruction signal indicating a channel selected by the channel setting means on a predetermined signal path. 3. The receiver according to claim 2, wherein said channel setting means selects a channel of each receiving circuit means collectively by one system of selection means. The wireless microphone constituting the wireless microphone system according to claim 1, wherein a different appearance element for each compatible band and a channel indication signal from a receiver to receive one channel from a plurality of transmittable channels. A wireless microphone comprising: a channel switching unit for selecting. 5. The channel switching unit according to claim 4, wherein the channel switching unit receives the channel instruction signal for a predetermined period after turning on power, selects one channel, and suspends the operation of receiving the channel instruction signal. wireless microphone. 5. The wireless microphone according to claim 4, wherein the channel switching unit receives the channel instruction signal for a predetermined period and selects one channel each time a predetermined user input is received. 6.

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