JP4109275B2 - Speaker device for wireless microphone loudspeaker system - Google Patents

Description

  The present invention relates to a speaker device suitable for application to a karaoke apparatus installed in a restaurant where a plurality of customer service zones are gently divided.

In general, a wireless microphone loudspeaker system equipped with a large number of speaker devices is used by, for example, installing speaker devices scattered in a wide lecture hall. The voice of the instructor via the wireless microphone is output in the same way from any speaker device so that it reaches every corner of the venue. Japanese Patent Laid-Open No. 2002-78037 also discloses a wireless microphone loudspeaker that can adjust the volume and sound quality in accordance with the use environment of the wireless microphone.
JP 2002-78037 A

In the karaoke apparatus, the voice sung toward the wireless microphone is mixed with the karaoke accompaniment music and is acoustically output from the speaker.
For example, in a store with a business category such as karaoke snacks, all customers in the store share one karaoke device, and the same karaoke accompaniment music and singing voice are emitted uniformly in the store. In these stores, various customers who come to the store in various individuals and groups are scattered in the store, but while you are singing karaoke and others are singing karaoke, In the same way, karaoke performance and singing voice are emitted. However, if you and your friends are singing, it may be painful if you are unaware of other people's singing in the same way as the parties, and you will not be enthusiastic about conversations with your friends.

  Therefore, even when sharing a karaoke space with another person, while the other person is singing, the singing voice is emitted only around the singer himself, and otherwise singing to about BGM. When the volume is suppressed, it is convenient without being harsh.

A typical wireless microphone transmits a signal having an electromagnetic wave such as a microwave or infrared rays as a carrier wave. In the former type, a microwave antenna is a signal trap, and in the latter type, an infrared sensor is a signal trap. In any type, the closer the wireless microphone that emits the transmission signal is to the signal capturing device (which is an antenna or an infrared sensor, but representatively an antenna), the greater the reception strength by the antenna. That is, the smaller the distance between the antenna and the wireless microphone, the higher the reception strength by the antenna.
The inventor of this application pays attention to the above fact and thought that if the antenna is installed on the speaker side, the reception strength by the antenna increases as the distance between the speaker and the wireless microphone decreases. This idea was developed to create the present invention.

Therefore, the speaker device for the wireless microphone loudspeaker system according to the present invention is specified by the following items (1) to (7).
(1) The enclosure is equipped with a speaker and a wireless microphone receiving means, and the speaker device is connected to an input signal cable and an output signal cable. (2) The speaker is driven by an audio signal from the input signal cable. (3) The wireless microphone receiving means includes a signal capturing device, a receiving circuit, an intensity detecting circuit, and a multiplexing circuit. (4) The signal capturing device captures a radio signal from the wireless microphone. (5) The receiving circuit receives and demodulates the captured radio signal and outputs an audio signal. (6) The strength detection circuit detects the received signal strength of the captured radio signal and receives the received signal strength. (7) The multiplexing circuit multiplexes the audio signal from the reception circuit and the reception intensity signal from the intensity detection circuit and introduces it to the output signal cable. Be

  In the present invention, the signal capturing device is preferably a microwave antenna or an infrared sensor.

  Since this speaker device is provided with a wireless microphone receiver integrally with the speaker, the reception intensity from the wireless microphone at the installation location of the speaker device is known. Moreover, it can be easily connected to an audio device such as a karaoke device with a cable. Therefore, for example, when this speaker device is applied to a karaoke device, it is possible to emphasize sound output when the reception strength from the wireless microphone is high, and to suppress the amount of sound from the wireless microphone when the reception strength is low. . If a large number of speaker devices are connected to a single karaoke device and scattered in the store, the sound input to the wireless microphone can be remarkably heard only from the speaker device close to the wireless microphone. Therefore, even when sharing the karaoke space with another person, the karaoke space can be gently shared while avoiding that the singing voice is an obstacle to other people. In addition, since the karaoke performance is continued as BGM, the atmosphere in the store does not change greatly, and the karaoke space can be shared gently in this respect.

=== Configuration of Speaker Device ===
The speaker device according to this embodiment is configured by a substantially rectangular parallelepiped enclosure as shown in FIG. FIG. 2 illustrates the schematic block configuration. The speaker device 1 includes an antenna 2, a reception demodulation circuit 3, a reception intensity detection circuit 4, a multiplexing circuit 5, and a speaker 6. That is, the speaker device 1 is integrally provided with a wireless microphone receiver that receives and demodulates radio signals from the wireless microphone.

  The antenna 2 receives a radio signal from a wireless microphone. The reception demodulation circuit 3 demodulates and amplifies the signal received by the antenna 2 and outputs an audio signal. The reception intensity detection circuit 4 detects the reception intensity by the antenna 2 and outputs a reception intensity signal obtained by digitizing the reception intensity. The multiplexing circuit 5 multiplexes the audio signal output from the reception demodulation circuit 3 and the reception intensity signal output from the reception intensity detection circuit 4 and outputs the multiplexed signal.

  On the front surface of the enclosure when the speaker device 1 of this embodiment is installed, an antenna 2 and a speaker 6 are disposed in the same plane. Also, from the back of the enclosure, an audio signal output plug for leading from the output terminal of the multiplexing circuit 5 to the audio input terminal of the external acoustic device is drawn out by the microphone cable, and is led from the speaker 6 to the audio output terminal of the external acoustic device. A speaker cable is drawn out, and a power plug connected to a commercial power outlet is drawn out with the cable.

=== Example of application to karaoke equipment ===
The speaker device 1 according to the present invention can be applied to the design concept by applying it to the following karaoke equipment of a restaurant. In a large store of a certain type of restaurant, a wide store space is gently divided into a number of customer service zones, and the space is shared as a whole. One karaoke device is arranged in the store, and a large number of speaker devices are arranged so as to share each reception zone so as to cover all the reception zones. In this store, a large volume is not emitted from a single stereo speaker and reverberated throughout the store, but a large number of customer service zones are shared by a large number of speaker devices that emit a modest low volume. In addition, this speaker apparatus 1 is easily applicable only by connecting with a karaoke apparatus with a cable.

  FIG. 3 shows an essential part of the invention of an electrical system configuration of a karaoke apparatus to which the speaker device 1 is applied. In this embodiment, for the sake of simplicity, it is assumed that four speaker devices 1a to 1d are applied to a karaoke device. This karaoke apparatus includes a microcomputer 7, a music playback unit 8, mixing amplifiers 9 a to 9 d, a separation circuit 10 a to 10 d, a selector 11, and a distributor 12. Control that controls the entire karaoke apparatus is performed by a main computer (not shown).

  Each speaker device 1a to 1d is connected to a karaoke device by a microphone cable and a speaker cable. For example, each of the speaker devices 1a to 1d is gently divided into a plurality of customer service zones such as a counter corner, a large sofa corner, a table seat corner, and a stage. The service areas are distributed so as to share the customer service zone and are arranged on the ceiling or the like.

  In FIG. 3, the music playback unit 8 plays stereo accompaniment music based on the karaoke data of the requested song under the control of the main computer. Then, the right channel music signal is amplified by the mixing amplifiers 9a and 9c and output to the two speaker devices 1a and 1c, and the left channel music signal is amplified by the mixing amplifiers 9b and 9d and the speaker device 1b, Output toward 1d.

The karaoke apparatus is supplied with the above multiplexed signals output from the four wireless microphone receivers incorporated in the speaker apparatuses 1a to 1d. As described above, this multiplexed signal is obtained by multiplexing the audio signal demodulated by receiving the radio signal of the wireless microphone and the signal indicating the reception strength of the radio signal.
In each of the separation circuits 10a to 10d, the multiplexed signal received from the wireless microphone receiver of each speaker device 1a to 1d is separated into an audio signal and a reception intensity signal, and the audio signal is input to the selector 11, and the reception intensity signal is input. Input to the microcomputer 7.

The microcomputer 7 compares the received intensity signals from the separation circuits 10a to 10d with each other, determines which of the four wireless microphone receivers has the highest received intensity, and receives the wireless microphone reception indicating the maximum received intensity. The selector 11 is controlled so as to select an audio signal from the machine.
From the selector 11, one audio signal designated by the microcomputer 7 among the audio signals from the four wireless microphone receivers is selectively output and supplied to the distributor 12.

  The distributor 12 is a multi-channel amplifier with one input and four outputs, and the gains of the four amplifiers are individually controlled by signals from the microcomputer 7. The microcomputer 7 controls the gains of the four amplifiers in the distributor 12 as described below based on the received intensity signals from the four wireless microphone receivers.

  The four outputs of the distributor 12 are respectively input to the four mixing amplifiers 9a to 9d, and the audio signal of the accompaniment music from the music playback unit 8 and the audio signal of the singing voice from the wireless microphone receiver selected by the selector 11 Are mixed and amplified. The outputs of the four mixing amplifiers 9a to 9d are respectively supplied to the four speaker devices 1a to 1d via the speaker cables, and are emitted from the speakers 6a to 6d.

=== Gain designation ===
The microcomputer 7 designates the gains of the four amplifiers in the distributor 12 based on the reception intensity signals from the four wireless microphone receivers. For example, depending on which wireless microphone receiver has the maximum reception intensity, the amplifier connected to the speaker device 1 in which the wireless microphone receiver is incorporated, and the amplifier connected to the other speaker device 1 Thus, each designated gain is set in advance and stored in the memory 13. A combination of designated gains may be determined depending on the arrangement of the speaker device 1.

  That is, for example, when the speaker device incorporating the wireless microphone receiver having the maximum reception intensity is 1a, the designated gain to the amplifier connected to the speaker device 1a is set to 1. Then, the designated gain to the amplifier connected to the speaker device 1b arranged in the vicinity of the speaker device 1a is set to 0.4, and the designated gain to the amplifier connected to the other speaker devices 1c and 1d is set to 0.1. .

  In this way, the singing voice is emitted as it is from the speaker 6a close to the wireless microphone, and the singing voice from the neighboring speaker 6b is suppressed to half or less. Singing voices are hardly emitted from the other speakers 6c and 6d. That is, the singing voice is output as it is only from the speaker 6a closest to the singer, and the singing voice is suppressed according to the arrangement of the other speakers 6b to 6d. Also in this case, the karaoke accompaniment music is output unchanged from any of the speakers 6a to 6d. Therefore, karaoke performance as BGM is continued even at a place away from the singer, and there is no fear that the atmosphere in the store will be changed greatly.

  Of course, a method may be used in which the gains of the amplifiers connected to the speaker devices 1a to 1d in which the wireless microphone receivers are incorporated are specified so as to be proportional to the reception intensity at the wireless microphone receivers. In that case, since the singing voice is appropriately suppressed according to the distance from the singer of each of the speaker devices 1a to 1d, the karaoke space can be shared gently as in the above embodiment. .

=== Other Embodiments ===
In the above-described embodiment, the gain is specified in the preceding stage of each mixing amplifier 9a-9b to suppress the volume of the singing voice. However, as another method, the gain is set in the output path of each mixing amplifier 9a-9d. The volume may be suppressed by designating. In this case, since the gain is specified after mixing the singing voice and the karaoke accompaniment music, the volume of the karaoke accompaniment music is suppressed together with the singing voice except for the speaker device 1 close to the singer. become. Therefore, even for the speaker device 1 far from the singer, if the designated gain is set to a value that is appropriately smaller than zero, the harsh sound can be suppressed and the karaoke space can be shared.

  The wireless method of the wireless microphone is not limited to a radio wave type such as a microwave, and the present invention can also be applied to an infrared type. In that case, an infrared sensor is applied to the wireless microphone receiver.

  Note that the commercial power cord can be omitted by supplying the DC power superimposed on the audio signal of the microphone cable without supplying the commercial power to the speaker device.

  If a commercial power supply is supplied, a power amplifier for driving the speaker 6 may be built in the speaker device. In that case, the power amplifier circuit can be omitted from the mixing amplifiers 9a to 9b, and instead of the speaker cable. Connect with an audio signal cable.

1 is an external perspective view of a speaker device according to an embodiment. It is a functional block diagram of a speaker apparatus same as the above. It is a functional block diagram of the karaoke apparatus which adapted the speaker apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker apparatus 2 Antenna 3 Reception demodulation circuit 4 Reception intensity detection circuit 5 Multiplexing circuit 6 Speaker

Claims (3)

A speaker device in which an enclosure is equipped with a speaker and a wireless microphone receiving means, and an input signal cable and an output signal cable are connected,
The speaker is driven by the audio signal from the input signal cable and emits sound.
The wireless microphone receiving means includes a signal capturing device, a receiving circuit, an intensity detecting circuit, and a multiplexing circuit,
The signal capturer can capture the radio signal from the wireless microphone,
The receiving circuit receives and demodulates the captured radio signal and outputs an audio signal,
The strength detection circuit detects the received signal strength of the captured radio signal and outputs a received strength signal.
The multiplexing circuit is a speaker device that multiplexes the audio signal from the reception circuit and the reception intensity signal from the intensity detection circuit and derives them to the output signal cable. The speaker device according to claim 1, wherein the signal trap is a microwave antenna. The speaker device according to claim 1, wherein the signal capturing device is an infrared sensor.

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