KR100902158B1 - Wireless loudspeaker broadcasting system - Google Patents

Abstract

A wireless loudspeaker broadcasting system is provided to convert the speech signal into the radio signal and transmit the radio frequency. The wireless loudspeaker broadcasting system is comprised of a voice amplification unit(110), a radio frequency receiving unit(130), and a telephony interface(150) and a controller(170). The voice amplification unit amplifies a speech signal inputted through a microphone(MIC). The speech signal can come from the telephone interface(150). The radio frequency receiving unit modulates the amplified voice signal and transmits the radio frequency through the antenna. The controller controls the whole operation of the transmitting amplifier part. For this, the controller provides the user interface. The telephony interface carries the speech signal for operating the transmitting amplifier part to the controller.

Description

Wireless loudspeaker broadcasting system

The present invention relates to a technology of reproducing a voice signal by wirelessly transmitting the voice signal from the amplifier and wirelessly receiving the voice signal from the speaker, rather than reproducing the voice signal amplified from the amplifier through a wire.

Usually, villages are naturally formed villages and are formed along the mountain. Such an environment is very inconvenient for the person in charge of village work (Lee Zhang, etc.). Many villages are even more than two to three kilometers away. In case of fire or emergency, the person in charge had to run quickly and broadcast to the place such as the town hall.

Many villages have existing broadcasting facilities. Such a broadcasting facility is constructed by installing a broadcasting amplifier in a town hall and connecting a plurality of speakers to separate places by wire. Installation costs are also high because many speakers are wired to the broadcast amplifier, but the maintenance burden is very large. As a large number of speakers are connected and used, the load on the amplifier increases, causing frequent breakdowns in the amplifier output stage, and wired lines are also exposed to the atmosphere, which greatly shortens their lifespan due to rain, snow, animals, and pollution. In addition, the line is often damaged and broken due to inadvertent work due to the work of other companies (electric work, communication work, etc.), which requires a lot of maintenance costs.

In order to solve the above problems, in the present invention, a broadcasting amplifier is installed in a town hall or the like, and the amplifier includes a wireless transmitter which amplifies and transmits a voice signal, and converts the voice signal into a wireless signal by the wireless transmitter. The present invention proposes a system including a transmission amplifier unit for transmitting and receiving a wireless signal to a wireless reception speaker installed at a remote site to reproduce a voice.

In order to solve the above problems, the wireless speaker broadcasting system according to the present invention includes a transmission amplifier unit for converting and transmitting a voice signal to a radio signal to receive a radio signal by a wireless receiving speaker installed in a remote place to reproduce the voice. . The transmission amplifier unit controls the overall operation of the transmission amplifier unit by a voice amplifier unit for amplifying the input voice signal, a wireless transmitter unit for wirelessly modulating the amplified voice signal and transmitting it as a wireless signal, and providing a user interface. It includes a control unit for allowing the operation, the wireless transmitter

Low frequency amplifier for amplifying the voice signal output from the voice amplifier, a modulator for converting the amplified low frequency voice signal into a radio signal by a predetermined method, a wireless transmitter for amplifying the modulated radio signal and transmitting it to the antenna, the radio transmitter only when transmitting In order to operate the function of the, characterized in that it comprises a transmission controller for activating / deactivating or turning on / off the portion of the radio transmitter only related to the radio signal transmission.

The wireless receiving speaker further includes a wireless receiving unit for receiving a wireless signal transmitted from the transmitting amplifier unit, and a voice for reproducing voice through the speaker by a process of demodulating the received wireless signal to detect and amplify the voice signal. Characterized in that it comprises a playback unit. The wireless receiving speaker unit may further include a power control unit to turn on the power only when a signal is received instead of always supplying power.

In addition, the voice amplifier maintains the sound quality of the microphone input signal or waveform shaping with a better sound quality, the preamplifier for amplifying the first input voice signal, the first amplified voice signal from the preamplifier as a large power signal And an EQ unit (equalizer) for allowing the user to adjust the tone and volume of the voice signal output from the power amplifier and the preamp to be amplified.

The voice signal input to the wireless transmitter is preferably branched from the EQ unit after the preamplifier, but is not limited thereto.

In addition, in the broadcasting system of the present invention, a telephone interface for transmitting a voice signal to the controller through the telephone to operate the transmission amplifier unit by a ring tone signal externally input to the controller through the telephone is added. It may be included as.

Here, the telephone interface can be implemented in the manner of a known phone pager (phone pager).

The wireless transmitter, which is a component in the broadcasting system according to the present invention, is a transmission control amplifier for amplifying a voice signal input to a low frequency amplifier, a signal level detector for detecting the level of the amplified signal, and the detected signal level is greater than a predetermined value. And a photoelectric element for controlling the transmission controller for controlling the activation and deactivation of a portion related to the transmission of radio signals by receiving the light when the LED is turned on and generating light power when the LED is turned on. It is done.

Here, the transmission controller includes a sensitivity controller for controlling whether to perform a transmission control function when a signal level is detected and a transmission controller after a predetermined time delay when a signal of a predetermined level or more is detected. In order to minimize the malfunction of the transmitter due to the fine noise, it is preferable to further include a time delay controller for delaying the start time of performing the transmission control function and simultaneously adjusting the delay time. It doesn't happen.

The wireless transmitter may be implemented as a transceiver having a microphone input terminal and a PTT terminal, and the signal from the voice amplifier is connected to the microphone input terminal MIC of the transceiver, and the transmission control signal output from the transmission controller is provided in the transceiver. It is possible to connect to the PTT terminal (push-to-talk).

When implemented as a transceiver, it is preferable to add a timer for providing a timing signal to the transmission controller to reset the PTT terminal of the transceiver every predetermined time so that the transmission can be continuously performed without interrupting the forced transmission of the transceiver.

In addition, the wireless receiving unit of the wireless receiving speaker unit can also be implemented by the receiving end of the transceiver.

On the other hand, the control unit which is one of the components of the broadcasting system according to the present invention, a telephone call processor for processing a call signal transmitted from the telephone when connected via a telephone from the outside, a system starter for initializing the transmission amplifier, A system shut-off unit for blocking the operation of the transmission amplifier unit detects an input voice signal and causes the system start unit to start the transmission amplifier system and cause the system shutdown unit to shut down the transmission amplifier system if a voice signal is not detected for a predetermined time. And an input speech detector.

In addition, in order to set the channel so that the transmission amplifier unit does not interfere with another system between the wireless receiving speaker unit installed at a remote location, it is necessary to set the same communication frequency only between the wireless transmitting unit and the wireless receiving speaker of the transmitting amplifier unit. Wireless speaker broadcasting system characterized in that.

In addition, it is also possible to additionally set so that the password of the DTMF (dual tone multi-frequency) method is coincident between the radio transmitter and the radio receiver of the transmitter amplifier unit.

According to the present invention, since there is no wired connection between the amplifier and the speaker, not only can solve all the problems caused by the existing wire, but also in terms of wireless broadcasting, if the existing transceiver to be implemented as it is It is possible to add only the radio part without replacing the amplifier system installed in the system. In an emergency situation, broadcasts can be made remotely by telephone or mobile communication.

1 is a schematic diagram of a wireless speaker broadcasting system according to the present invention.

The transmission amplifier unit 100 includes a wireless transmission unit as an amplifier installed in a town hall or the like. The signal transmitted from the antenna is wirelessly received by a plurality of receiving speaker units 200 installed at remote locations and reproduced as a voice signal. The transmission amplifier unit 100 can input a microphone (MIC) like a normal amplifier, and can also input voice by a telephone (including a mobile telephone).

2 shows an internal configuration of the transmission amplifier unit 100.

Largely, a voice amplifier 110 for amplifying the voice signal input through the MIC, and a radio transmitter 130 for transmitting the antenna signal through the antenna ANT by amplifying the amplified voice signal. The voice signal input to the voice amplifier 110 is basically a microphone (MIC) signal, but a voice signal from a telephone (including a mobile phone) that is input through the telephone interface 150 is also possible.

The control unit 170 controls the overall operation of the transmission amplifier unit 100 and provides a user interface (not shown) to operate the transmission amplifier unit 100.

The telephone interface 150 transmits a voice signal to the controller 170 through the telephone to operate the transmission amplifier unit 100 by a ring tone signal input to the controller 170 through the telephone 151. It plays a role.

3 is a configuration diagram of the receiving speaker unit 200.

Basically, the wireless receiver 210 receives and processes the wireless signal through the antenna ANT, and the voice is received through the speaker SP by processing such as detecting and amplifying the voice signal by demodulating the received wireless signal. It is composed of a voice reproducing unit 220 to reproduce. Since the reception speaker unit 200 is installed outdoors unlike the transmission amplifier unit 100, an additional power control unit 230 may be further included to turn on the power only when a signal is received instead of always supplying power. Can be. However, it is not limited thereto. As the power supply 240, a general commercial AC power supply is also possible, but a battery or a solar cell may, of course, also be possible.

Hereinafter, the spirit of the present invention will be described through more specific examples.

4 illustrates an internal configuration of an embodiment of the voice amplifier 110 of FIG. The voice amplifier 110 includes a preamplifier 111, a power amplifier 112, an EQ unit 113, and a local speaker terminal (LOC.SP). The preamplifier 111 performs primary amplification at a small amplification rate while maintaining the sound quality of the microphone input signal (or performing waveform shaping with a better sound quality), and the power amplifier 112 is primarily amplified from the preamplifier 111. It amplifies the amplified voice signal as a large signal. The EQ unit (equalizer) 113 serves to allow a user to adjust the tone and volume of the voice signal output from the preamplifier 111 and is known to those skilled in the art. In the present embodiment, the voice signal input to the wireless transmitter 130 is extracted from the EQ unit 113 after the preamplifier 111. When the power amplifier 112 is pulled out, a signal larger than the rated input level of the wireless transmitter 130 is input, so that the voice signal mixed with the signal transmitted from the wireless transmitter 130 is distorted and transmitted. However, FIG. 4 is an embodiment, and whether a voice signal input to the wireless transmitter 130 is to be extracted from the preamplifier or the EQ unit or after the power amplifier stage may be selected at the discretion of those skilled in the art. In addition, in FIG. 4, the local speaker terminal (LOC.SP) is a terminal for connecting a monitor speaker or a local speaker for a specific use, and is a terminal for reproducing an audio signal output from the power amplifier 112.

5 shows an embodiment of the wireless transmitter 130 of FIG.

The upper part of Fig. 5 is a configuration well known as a general configuration of a general wireless transmitter. That is, a low frequency amplifier 131 for amplifying the voice signal output from the voice amplifier 110, a modulator 132 for converting the amplified low frequency voice signal into a wireless signal by a predetermined method, amplified the modulated radio signal antenna It is composed of a wireless transmitter 133 for sending out.

In the lower part of FIG. 5, a transmission controller 134 is further included. This is to operate the function of the wireless transmitter 130 only at the time of transmission, and by this transmission controller, it is possible to activate / deactivate the portion of the wireless transmitter 130 only related to wireless signal transmission or to turn on / off the power. The operation of the transmission controller 134 is controlled by the presence and absence of a voice signal input to the voice amplifier 131. The transmission controller 134 may activate / deactivate or turn on / off the power related to the radio signal transmission through the relay, but is not limited thereto. In the lower part of Fig. 5, additional components for operating the transmission controller 134 are shown.

Referring to the lower part of FIG. 5, the transmission control amplifier 135 amplifies a part of the voice signal (the signal output from the voice amplifier 10) input to the low frequency amplifier 131, and senses the level of the amplified signal. A signal level detector 136, an LED that is turned on when the detected signal level is greater than a predetermined value, an optoelectronic device such as a CDS that receives the light to generate optical power when the LED is turned on, and an operation of the optoelectronic device. By the transmission controller 134 for controlling the activation and deactivation of the portion related to the radio signal transmission of FIG.

Meanwhile, as another embodiment of FIG. 5, as shown in FIG. 6, the transmission controller 134 includes a sensitivity controller 137 for adjusting a signal level when a signal level is detected. When a signal of a predetermined level or more is detected, a time delay adjuster 138 may be further included to delay the start time of performing the transmission control function and simultaneously adjust the delay time.

More specifically, the sensitivity controller 137 is to adjust whether the operation of the transmission controller 134 is operated even with a very weak voice signal, or how strong a signal is to be operated, for example, If the sensitivity is set too low, the operation stability against fine noise in the surroundings is secured, but if the microphone is loudly input, the transmitter may operate. If the sensitivity is set too high, the transmitter operates even with a weak voice signal. As a result, there may be a problem that the transmitter operates due to the ambient noise. Therefore, when the system of the present invention is installed, it will be possible to adjust the sensitivity to be optimal to the surrounding environment and conditions, the requirements of the consumer. The role of the time delay controller 138 is also similar to the role of the sensitivity controller 137 and its purpose. However, in the case of the time delay controller 138, the transmission controller 134 is operated after a predetermined time delay even if there is an input signal, thereby minimizing a malfunction of the transmitter due to fine noise. Instead of directly inputting the signal to the transmission controller 134, the reason why the signal is converted into LED light and received by the optoelectronic device is because of the operation stability against noise. When the voice signal is directly input to the transmission controller 134, a problem occurs in which the transmission controller 134 malfunctions due to noise when the voice signal is cut off, thereby disconnecting the electrical connection and making an optical connection instead.

As another embodiment, the wireless transmitter 130 of FIGS. 5 and 6 may be configured by using a transceiver (aka, 2m radio) that is widely used (see FIG. 7). Referring to FIG. 7, the signal from the voice amplifier 10 is directly connected to the microphone input terminal MIC of the transceiver 140, and the transmission control signal output from the transmission controller 134 is a PTT terminal provided in the transceiver 140. Just connect to push-to-talk. The PTT refers to a button that a user presses and speaks during transmission in order to switch transmission and reception to the transceiver 140. Most transceivers are provided with a PTT button and a remote PTT terminal. When configuring the wireless transmitter 130 using the existing transceiver as shown in Figure 7, it will be possible to perform a stable transmission function while reducing the effort according to a separate circuit configuration.

In the case of using a ready-made transceiver as shown in FIG. 7, in particular, in addition to the sensitivity controller 147 and the time delay controller 138, a timer 139 for providing a timing signal to the transmission controller 134 to reset the PTT stage every predetermined time. Is preferably added. This is because, in the general transceiver, the broadcasting function will be stopped because the transmission function is automatically stopped when the continuous transmission time passes about 10 minutes due to the reduction of battery power. Therefore, in the case of using the ready-made transceiver as shown in Figure 7, in order to prevent such interruption, it is desirable to enable continuous transmission by resetting the PTT just before every 10 minutes by the timer 139.

Similarly, the receiving speaker unit 200 as shown in FIG. 3 may also be easily configured by utilizing the receiving end of the ready-made transceiver.

2, the telephone interface 150 and the controller 170 will be described. The telephone interface 150 operates the transmission amplifier unit 100 through a telephone, and serves to input a voice signal through the wired telephone 151 or a mobile communication terminal instead of the microphone input to the voice amplifier 110. do. In FIG. 2, a signal output from the telephone interface 150 is input to the controller 170, processed by the controller 170, and then input to the voice amplifier 110. The telephone interface 150 shown in FIG. 2 can utilize the principles of the known phone pager. Phone Phaser is a well-known device for controlling the operation of a specific product (washing machine, air conditioner, etc.) using a telephone remotely.

In FIG. 2, the telephone interface 150 operates the transmission amplifier unit 100 by a ring tone signal input to the controller 170 through the phone 151 and controls the voice signal through the phone 170. ) To deliver.

The controller 170 controls the overall operation of the transmission amplifier unit 100, and serves to operate the transmission amplifier unit 100 by providing a user interface (UI). 8 illustrates a configuration of one embodiment of the controller 170.

In the control unit 170 of FIG. 8, the system starting unit 171 initializes the transmission amplifier unit 100 system, and the user may directly operate the main switch, or when the telephone call processor is connected from the outside through a telephone. The system start unit 171 may be operated by processing the call signal at 173. In other words, operation is performed by DTMF (dual tone multi-frequency) method by pressing a specific key through the telephone. When the system is initially started, a melody or signal music is generated and transmitted from the melody generator 172 informing the start of broadcasting. On the other hand, in addition to the main switch and the telephone, it is also possible to start the system by detecting the input voice input to the microphone. That is, when the voice signal input from the input voice detector 174 is detected, the system starter 171 starts the transmission amplifier system, or if the voice signal is not detected for a predetermined time, the system blocker 175 transmits the signal. The amplifier system can be shut off.

Meanwhile, the receiver of the receiver speaker 200 of FIG. 3 and the transmitter of the transmitter 100 of FIG. 5 should be channel-set so as not to interfere with other systems. To this end, various methods can be applied. For example, a method of setting the same communication frequency (that is, a channel) only between the wireless transmitter 130 of the transmission amplifier unit 100 and the wireless receiver 210 of the receiver speaker 200 may be the most basic method. have. This can be done easily, especially when using off-the-shelf transceivers (all transceivers have multiple channel setting selections).

However, it is difficult to prevent 100% interference with other systems only by matching the communication frequency between the transmitter and receiver. Therefore, in order to prevent more sophisticated interference, it is necessary to match the communication channel only between the radio transmitter and the receiver. In addition, it is more preferable to apply the transmitting amplifier unit 100 and the receiving speaker unit 200 to match the password using a password setting method used in existing DTMF (dual tone multi-frequency) equipment. More preferable.

The embodiments described above are merely one exemplary configuration for implementing the technical idea of the present invention, and do not limit the technical scope of the present invention. The technical scope or the scope of the present invention should be interpreted by the following claims.

1 is a schematic diagram of a system according to the present invention;

2 is a configuration diagram of the transmission amplifier unit 100.

3 is a configuration diagram of the receiving speaker unit 200.

4 is a diagram illustrating an embodiment of the voice amplifier 110 of FIG. 2.

5 is a configuration diagram of one embodiment of the wireless transmitter 130 of FIG.

6 is a diagram illustrating another embodiment of the wireless transmitter 130 of FIG. 2.

7 is a configuration diagram of another embodiment of the wireless transmitter 130 of FIG. 2.

FIG. 8 is a diagram illustrating an embodiment of the control unit 170 of FIG. 2.

Claims (16)

An amplifier for amplifying and transmitting a voice signal, the wireless speaker broadcasting unit comprising a transmission amplifier unit for converting and transmitting a voice signal into a wireless signal by a wireless transmitter unit so that a wireless receiver speaker installed at a remote site receives the wireless signal and reproduces the voice. As a system, The transmission amplifier unit A voice amplifier for amplifying the input voice signal; A radio transmitter for radio-modulating the amplified voice signal and transmitting the radio signal as a radio signal; It includes a control unit for controlling the overall operation of the transmission amplifier unit, and provides a user interface to operate the transmission amplifier unit, Wherein the wireless transmitter Low frequency amplifier for amplifying the voice signal output from the voice amplifier, A modulator for converting an amplified low frequency voice signal into a wireless signal for wireless communication; A wireless transmitter for amplifying a modulated radio signal and transmitting the modulated radio signal to an antenna; A wireless speaker broadcasting system for operating a function of a wireless transmitter only during transmission, the wireless speaker broadcasting system comprising a transmission controller for activating / deactivating or turning on / off power of only a portion of a wireless transmitter. The method of claim 1, wherein the wireless receiving speaker A wireless receiver for receiving a radio signal transmitted from the transmission amplifier unit; And a voice reproducing unit for demodulating the received wireless signal to detect and amplify the voice signal to reproduce the voice through the speaker. The method of claim 2, wherein the wireless receiving speaker A wireless speaker broadcasting system further comprises a power control unit to turn on only when a signal is received instead of always supplying power. The method of claim 1, wherein the negative amplifier is Preamp that maintains the sound quality of the microphone input signal or waveform shape with better sound quality, and amplifies the first input voice signal, Power amplifier that amplifies the first amplified voice signal from the preamplifier to a large signal as it is, And an EQ unit (equalizer) for allowing a user to adjust the tone and volume of the audio signal output from the preamplifier. The wireless speaker broadcasting system of claim 4, wherein the voice signal input to the wireless transmitter is branched from the EQ unit after the preamplifier. The apparatus of claim 1, further comprising a telephone interface configured to transmit a voice signal to the controller through the telephone to operate the transmission amplifier unit by a ring tone signal input to the controller externally through the telephone. Wireless speaker broadcasting system, characterized in that. According to claim 1, wherein the wireless transmitter A transmission control amplifier for amplifying a voice signal input to a low frequency amplifier; A signal level detector for detecting the level of the amplified signal, LEDs that light when the detected signal level is greater than a predetermined reference signal level, And a photoelectric device for receiving the light when the LED is turned on to generate optical power and controlling the transmission controller to control activation and inactivation of a portion related to the transmission of a radio signal. 8. The transmission controller of claim 1 or 7, wherein the transmission controller A sensitivity controller for adjusting a reference signal level capable of performing a transmission control function; When a signal equal to or greater than the reference signal level is detected, the transmission controller is operated after a predetermined time has elapsed and delayed, thereby delaying the start time for performing the transmission control function and simultaneously adjusting the delay time. Wireless delayer system characterized in that the time delay controller is further connected. The method according to claim 1 or 7, The wireless transmitter is a transceiver having a microphone input terminal and a PTT terminal, The signal from the voice amplifier is connected to the microphone input terminal MIC of the transceiver, And a transmission control signal output from the transmission controller is connected to a push-to-talk terminal provided in a transceiver. The method of claim 8, The wireless transmitter is a transceiver having a microphone input terminal and a PTT terminal, The signal from the voice amplifier is connected to the microphone input terminal MIC of the transceiver, And a transmission control signal output from the transmission controller is connected to a push-to-talk terminal provided in a transceiver. 11. The method of claim 10, wherein a timer for providing a timing signal to the transmission controller is added to reset the PTT terminal of the transceiver at a predetermined time interval, thereby enabling continuous transmission without interrupting the forced transmission of the transceiver. Wireless speaker broadcasting system characterized in that. 4. The wireless speaker broadcasting system of claim 2 or 3, wherein the wireless receiving unit of the wireless receiving speaker is a receiving end of a transceiver. 7. A wireless speaker broadcasting system according to claim 6, wherein the telephone interface is a known phone pager. The method of claim 1, wherein the control unit Telephone call processor that processes the call signal transmitted from the telephone when connected through the telephone from the outside, A system starter which initially starts the transmission amplifier unit; A system blocking unit which blocks the operation of the transmission amplifier unit, And an input voice detector for detecting an input voice signal and causing the system starter to start the transmit amplifier system and cause the system shut-off unit to shut off the transmit amplifier system if a voice signal is not detected for a predetermined time. Wireless speaker broadcasting system. The method of claim 1, wherein the transmitting amplifier unit to set the channel so as not to interfere with other systems with the wireless receiving speaker unit installed in a remote place, A wireless speaker broadcasting system, wherein the same communication frequency is set only between the wireless transmitting unit and the wireless receiving speaker. The wireless speaker broadcasting system of claim 15, wherein a DTMF (dual tone multi-frequency) type password is set to coincide between the radio transmitter and the radio receiver of the transmitter.

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