KR101704980B1 - Public address system using frequency modulation - Google Patents

Abstract

The present invention relates to a public address system using frequency modulation. The present invention comprises: a transmission unit for transmitting a signal; a public address device for outputting a complex voice signal with a modulated frequency to the transmission unit; and a speaker for outputting a voice signal for each frequency channel of a demodulated complex voice signal. The present invention reduces noise to improve the delivery of broadcasting content through the speaker.

Description

[0001] PUBLIC ADDRESS SYSTEM USING FREQUENCY MODULATION [0002]

The present invention relates to a public address system.

In general public address broadcasting systems, voice, music, siren, etc. are amplified by a power amplifier and transmitted to a plurality of speakers.

In this case, a plurality of speakers are connected along a dedicated electric wire by using a dedicated electric wire connecting the power amplifier and the speaker. Therefore, as the installation distance of the speaker becomes longer, the damping factor decreases significantly and the sound clearness It becomes very low.

In the case of the public address system, the capacity of the power amplifier is determined according to the number of speakers, so that a system is constructed. In order to amplify the signal, additional amplifiers must be installed. The audio signal is outputted, the broadcast contents can be precisely sheared, and the power amp can be broken down.

In addition, if the number of speakers is reduced in a system already built, the unbalance of the output becomes intense, and only a specific circuit becomes excessively loud, so that additional measures for adjustment of the output are required.

In order to solve such a problem, Korean Patent Laid-Open Publication No. 10-2014-0005611 (filed on July 5, 2012, published on Apr. 13, 2014, hereinafter referred to as " A public address broadcasting technique in which a device is transmitted to a speaker digitally and a power amplifier is not used has been proposed.

However, in the related art, a process of converting an analog signal into a digital signal and a digital signal into an analog signal is additionally required. In this conversion process, distortion and loss of the sound are generated, and delays due to conversion occur.

It is an object of the present invention to provide an all-in-one broadcasting technique which can easily delete and add speakers and output a clear voice signal while reducing the noise even when the output amount of the audio signal is constant regardless of the distance .

In order to achieve the above object, a public address broadcasting system using frequency modulation according to an embodiment of the present invention includes: transmission means for transmitting a signal; A method for generating a single composite speech signal by classifying and assigning a speech signal input from at least one sound source providing apparatus to a frequency channel corresponding to the sound source providing apparatus in a specific frequency band, (Hereinafter referred to as " modulated signal ") to the transmitting means; And a speaker for receiving a modulation signal from the public address broadcasting apparatus through the transmission means, demodulating a frequency of the modulation signal, and outputting a voice signal for each frequency channel of the demodulated composite voice signal, have.

Here, the public address broadcasting apparatus may include: an input unit for receiving a voice signal from at least one sound source providing apparatus; A signal allocation unit for generating a single composite voice signal by classifying and assigning the voice signal input to the input unit to a frequency channel corresponding to the source providing apparatus; A modulating unit for modulating a frequency of the composite voice signal generated from the signal-to-be-received portion and generating a modulated signal; Wherein the public address broadcasting apparatus comprises: a driving signal generating unit for providing a driving signal for driving the speaker; And a signal output unit for outputting the modulation signal and the driving signal.

The speaker may further include: a receiver for receiving a signal through the transmitter; A demodulator for demodulating the frequency of the modulated signal received through the receiver; A channel selector for selecting a frequency channel in the complex speech signal demodulated through the demodulator; An amplifying unit for amplifying a voice signal in a frequency channel selected from the channel selecting unit; An output unit for outputting the audio signal amplified by the amplifying unit; And an output control unit for controlling amplification degree of the amplification unit.

In addition, the transmission means may be provided with a transmission cable having a single signal line.

And a signal mixing unit for mixing the driving signal and the modulation signal to generate a single output signal and providing the single output signal to the signal output unit, And output a mixed single output signal to the transmission means.

The speaker further includes a signal separating unit for separating a driving signal and a modulating signal from the output signal received from the receiving unit and providing the modulating signal to the demodulating unit, And the amplification degree of the amplification unit can be adjusted by adjusting the intensity of the driving signal.

Meanwhile, the transmission means may be provided with a transmission cable having at least two signal lines.

At this time, the signal output unit of the public address broadcasting apparatus can output the driving signal generated by the driving signal generating unit and the modulated signal generated by the modulating unit to different signal lines of the transmitting unit.

Here, the output adjusting unit may provide the driving signal received by the receiving unit to the amplifying unit, and the amplification degree of the amplifying unit may be adjusted by adjusting the intensity of the driving signal.

As described above, the present invention has the following effects.

First, the whole-body broadcasting apparatus frequency-modulates a voice signal to be transmitted and provides the voice signal to a speaker through a transmission line. The speaker demodulates the modulated signal and outputs a voice signal. As the transmission distance noise of the modulated frequency is reduced, Regardless of the installation distance between the broadcasting apparatus and the speaker, noise can be reduced while the amount of output of the voice signal is constant through the speaker, and the transmission power of the broadcast contents through the speaker can be increased.

Second, it is possible to transmit sound signals and power of a plurality of channels through a single transmission means, thereby facilitating expansion and deletion of speakers and less restriction on installation positions of speakers.

Third, a signal allocation unit of the public address broadcasting system generates a single composite voice signal by classifying a plurality of acoustic signals input from different sound source providing apparatuses into frequency channels, and a channel selection unit of a speaker installed in a specific area It is possible to output a voice signal according to the installation area of the speaker by simply selecting the frequency channel of the voice signal to be outputted in the corresponding zone, so that the whole-hall broadcasting apparatus does not separately output different sound signals for each frequency channel, The facility of the speaker can be simplified and the output of the acoustic signal of each zone can be selected from the speaker.

Fourth, the public address broadcasting system generates a single composite voice signal in which a plurality of acoustic signals are classified according to frequency channels, and a speaker can output a specific voice signal in a composite voice signal through frequency channel selection of a composite voice signal, It is possible to perform multi-channel broadcasting in which different voice signals are provided to a plurality of speakers arranged in the zone in the same time zone through a public hall broadcasting apparatus.

1 is a block diagram schematically showing a public address broadcasting system according to a first embodiment of the present invention.
2 is a block diagram schematically showing a public address broadcasting system according to a second embodiment of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for simplicity of explanation.

<First In the embodiment  &Lt; RTI ID = 0.0 &gt;

1 is a block diagram schematically showing a public address broadcasting system according to a first embodiment of the present invention.

The public address broadcasting system according to the first embodiment of the present invention may include a public hall broadcasting apparatus 100, a speaker 200, and a transmission means 300.

The public address broadcasting apparatus 100 classifies and assigns voice signals input from at least one sound source providing apparatus S to a frequency channel corresponding to a sound source providing apparatus in a specific frequency band to generate a single composite voice signal, (Hereinafter, referred to as 'modulation signal') and a driving signal for driving the speaker 200 to be described later by mixing the frequency of the composite voice signal with the frequency of the composite voice signal, And outputs the signal o to the input unit 110, the signal receiving unit 120, the modulating unit 130, the driving signal generating unit 140, the signal mixing unit 150, and the signal output unit 160 .

The input unit 110 may receive a voice signal from at least one sound source providing apparatus S.

Here, the sound source providing apparatus S may be a reproducing apparatus that provides a pre-stored sound source such as a CD player, an MP3 player, a PC, a notebook, and the like, and a sound input apparatus that provides a real-time sound source such as a microphone.

In addition, the sound source providing apparatus S may include an emergency situation guide device for providing sound sources for emergency broadcasts such as syllables, situation propagation, and evacuation announcements when an emergency occurs.

At this time, the input unit 110 has a plurality of terminals connected to the respective sound source providing apparatuses S, and receives voice signals in the form of analog signals from the respective sound source providing apparatuses S through the terminals, It may be provided in the form of a pre-amplifier so as to have the same amplitude, that is, to have a plurality of audio signals having the same intensity.

The signal-to-be-allocated unit 120 can classify and assign a voice signal input to the input unit 110 to a frequency channel corresponding to the sound source providing apparatus S to generate a single composite voice signal.

Here, the signal receiving unit 120 may have values for a plurality of frequency channels preset in accordance with the type of the sound source providing apparatus S in a specific frequency band.

For example, when the first audio signal in the 3.0 KHz frequency band and the second audio signal in the 3.0 KHz frequency band input from the PC are input through the input unit 110, the signal allocation unit 120 outputs the first A voice signal is allocated to one channel of a period of 100.1 MHz to 100.3 MHz and a second voice signal is allocated to two channels of a period of 100.5 MHz to 100.7 MHz to convert two different voice signals into a single signal of a 100 MHz frequency band It is possible to place them together.

In order to prevent interference between signals of each voice signal, the signal allocation unit 120 may divide the frequency channel into a frequency region spaced by a predetermined frequency interval, such as 200 KHz interval between 1 channel and 2 channels, Can be set.

Accordingly, the first audio signal and the second audio signal are simultaneously present in the 100 MHz frequency band, and as described above, a plurality of audio signals input from the plurality of sound source providing apparatuses S are multiplexed into a single composite audio signal It can be generated.

The modulation unit 130 can modulate the frequency of the composite voice signal generated from the signal allocation unit 130 to generate a modulation signal (a composite voice signal whose frequency is modulated).

Here, the modulator 130 may be configured to receive the modulated signal through the transmitting unit 300, and then output the modulated signal through the transmitting unit 300, In the output of the signal, the frequency modulation is performed before transmitting the signal to the speaker 200 so that the outputted voice signal can be clearly transmitted.

The driving signal generator 140 may provide a driving signal for driving the speaker 200.

At this time, the driving signal generator 140 may be provided in the form of a signal rectifier for minimizing the noise in the electric signal inputted from the outside and preventing the ripple noise of the electric signal.

The signal mixing unit 150 mixes the driving signal and the modulation signal to generate a single output signal o, and provides the output signal o to the signal output unit 160.

At this time, in addition to the driving signal for driving the speaker 200, the generated output signal o mixed through the signal mixing unit 150 includes a plurality of audio signals for each channel of a specific frequency band.

The signal output unit 160 may output the mixed output signal o by the signal mixing unit 150 to the transmission unit 300 described below.

The speaker 200 receives the output signal o from the public address broadcasting system 100 through the transmission means 300 and separates the modulation signal and the driving signal from the received output signal o, A signal demultiplexing unit 220, a demodulating unit 230, a channel selecting unit 240, and a demultiplexing unit 240. The demultiplexing unit 230 demultiplexes the multiplexed voice signal, An amplification unit 250, an output unit 260, and an output adjustment unit 270.

The receiving unit 210 can receive the output signal o output from the public address broadcasting apparatus 100 and transmitted through the transmitting means 300. [

The signal separating unit 220 separates the driving signal and the modulating signal from the output signal o received through the receiving unit 210 and provides the modulating signal to the demodulating unit 230. [

Here, since the driving signal separated from the signal separating unit 220 is provided from the front office broadcast apparatus 100, the speaker 200 does not need a separate structure for supplying the driving signal like the power supply cable, 300, the speaker 200 can be installed, and the installation position of the speaker 200 is not limited so that the speaker 200 can be easily replaced, enlarged and reduced.

The demodulation unit 230 may perform frequency demodulation of the modulated signal received through the reception unit 210.

The demodulator 230 demodulates the modulated signal provided from the signal demultiplexing unit 220 when the output signal o received from the receiving unit 210 is separated into the driving signal and the modulated signal by the signal demultiplexing unit 220. [ The frequency is demodulated.

At this time, the demodulator 230 demodulates the frequency of the modulated signal and obtains a composite voice signal including a voice signal for each channel of the specific frequency band generated by the signal allocation unit 130 of the related-art public broadcasting apparatus 100 do.

The channel selection unit 240 can select a specific frequency channel in the demodulated composite speech signal by the demodulation unit 230.

Here, the channel selection unit 240 may be configured such that only a voice signal of a corresponding channel is fixed and a specific frequency channel is received. However, the present invention is not limited to this, and a voice signal may be received from a user through a control unit such as a jog dial, a DIP switch, It may be possible to select a channel to be received.

In addition, the channel selection unit 240 may monitor the voice signal for each frequency channel of the composite voice signal.

More specifically, the channel selection unit 240 can determine whether a voice signal is included in a specific frequency channel of the complex voice signal demodulated by the demodulation unit 230.

At this time, if it is confirmed that the voice signal is included in the specific frequency channel of the composite voice signal, the channel selection unit 240 cancels the selection of the predetermined frequency channel and includes the voice signal It is possible to change the selection to the identified specific frequency channel and to control the supply of the driving signal to the output control unit 270, which will be described later.

For example, when the specific channel of the composite voice signal generated in the public address broadcasting system 100 is a frequency channel including a voice signal indicating a fire, an emergency broadcast, and a disaster situation (hereinafter, referred to as an emergency channel) The channel selection unit 240 of the base station 200 changes the previously selected frequency channel to the emergency channel when the voice channel is included in the emergency channel, The intensity of the signal is changed to the maximum value, and the output unit 260 outputs the voice signal of the emergency channel largely.

That is, the channel selection unit 240 confirms the occurrence of the emergency situation through the voice signal in the emergency channel through the speaker 200 outputting the voice signal for each channel through the presence / absence of the voice signal in the emergency channel, By outputting only the voice signal of the emergency channel transmitted from the public address broadcasting apparatus 100 at the maximum output, it is possible to accurately and quickly propagate at the time of occurrence of an emergency situation without a separate line for emergency situation propagation.

The amplification unit 250 may amplify the voice signal in the selected frequency channel from the channel selection unit 240 to clarify the output of the voice signal received from the channel selection unit 240. [

At this time, the amplification unit 250 amplifies the voice signal in the selected frequency channel from the channel selection unit 240 through the driving signal separated from the signal separation unit 220.

The output unit 260 can output the amplified voice signal through the amplification unit.

Here, the output unit may be provided in the form of a general speaker unit.

The output adjusting unit 270 may supply the driving signal separated from the signal separating unit 220 to the amplifying unit 250.

At this time, the output adjusting unit 270 adjusts the amplification of the audio signal through the amplifying unit 250 by adjusting the intensity of the driving signal supplied to the amplifying unit 250.

At this time, the output adjusting unit 270 may be combined with the amplifying unit 250 to provide a single amplifier, or may adjust the tone of the audio signal output through the output unit 260 Or an equalizer for generating a signal.

The transmission means 300 is provided with a transmission cable having a first signal line 310 and outputs the output signal o outputted from the signal output unit 160 of the sound pipe broadcasting apparatus 100 to a reception unit 210).

Here, the signal line 310 of the transmission means 300 is a line through which a single signal is transmitted, and the single signal line 310 is branched at a certain point and connected to the plurality of speakers 200 and 200 ' The front office broadcast apparatus 100 can provide the output signal o to the plurality of speakers 200 and 200 '.

That is, the whole-body broadcasting system according to the first embodiment of the present invention includes transmission means 300 in the form of a transmission cable having a signal line 310 for transmitting a single signal to the whole- The front office broadcasting apparatus 100 modulates the frequencies of the plurality of audio signals by a channel of a specific frequency band according to the sound source providing apparatus S providing the audio signals and outputs the modulated signals to the speaker 200 The speaker 200 separates the driving signal from the output signal o and supplies the driving power to the speaker 200. The driving signal is supplied to the speaker 200 through the transmission means 300, The transmitting means 300 having a line through which a single signal is transmitted can be obtained by demodulating the modulated signal and then outputting a voice signal of a specific channel so that a clear voice having a small noise on the plurality of speakers 200 and 200 ' Signal, and a plurality of speakers 200 and 200 ' Without a separate power connection, it is possible to receive power over the transmission means.

<2nd In the embodiment  &Lt; RTI ID = 0.0 &gt;

2 is a block diagram schematically showing a public address broadcasting system according to a second embodiment of the present invention.

The whole-body broadcasting system according to the second embodiment of the present invention can include the whole-body broadcasting apparatus 400, the speaker 500, and the transmission means 600, and the parts already described in the above- For the sake of brevity, we shall skip it.

The public address broadcasting apparatus 400 classifies and assigns voice signals input from at least one sound source providing apparatus S to a frequency channel corresponding to a sound source providing apparatus in a specific frequency band to generate a single composite voice signal, (Hereinafter, referred to as 'modulation signal') and a driving signal for driving the speaker 500, which will be described later, by frequency-modulating the frequency of the composite voice signal, And may include an input unit 410, a signal allocation unit 420, a modulation unit 430, a drive signal generation unit 440, and a signal output unit 450.

The configuration of the input unit 410, the signal receiving unit 420, the modulating unit 430 and the driving signal generating unit 440 is the same as that of the input unit 110 of the public address broadcasting apparatus 100 according to the above- Only the configuration of the signal output unit 450 which is the same as that of the sugar moiety 120, the modulation unit 130, and the drive signal generation unit 140 will be described.

The signal output unit 450 outputs the driving signal generated by the driving signal generation unit 440 and the modulation signal generated by the modulation unit 430 to the different signal lines 610 and 620 of the transmission unit 600 .

The speaker 500 receives the driving signal p and the modulation signal m from the public address broadcasting system 400 through the transmission means 600 and demodulates the received modulation signal m, A demodulation unit 520, a channel selection unit 530, an amplification unit 540, an output unit 550, and an output control unit 550. [0035] 560 &lt; / RTI &gt;

The configurations of the receiving unit 510, the demodulating unit 520, the channel selecting unit 530, the amplifying unit 540 and the output unit 550 are the same as those of the receiving unit 210, Only the configuration of the output adjusting unit 560 which is the same as that of the demodulating unit 230, the channel selecting unit 240, the amplifying unit 250 and the output unit 260 will be described .

The output adjusting unit 560 transmits the driving signal p received from the receiving unit 510 to the amplifying unit 540 through an individual signal line of the transmitting unit to be described later.

At this time, the output control unit 560 controls the amplification of the audio signal through the amplification unit 540 by adjusting the intensity of the driving signal supplied to the amplification unit 540.

The transmission means 600 is provided as a transmission cable having the first and second signal lines 610 and 620 and is connected to the modulation signal m output from the signal output unit 450 of the sound pipe broadcasting apparatus 400, (p) to the receiver 510 of the speaker 500 individually.

That is, the whole-body broadcasting system according to the second embodiment of the present invention is a system in which the front-office broadcasting apparatus 400 and the plurality of speakers 500 and 500 'individually transmit the driving signal p and the modulating signal m When the front office broadcast apparatus 400 is connected to the transmission means 600 of the transmission cable type having the first signal line 610 and the second signal line 620, And modulates the frequency of the modulated signal m and the driving signal p through the signal lines 610 and 620, which are different from each other, The speaker 600 receives driving power from the driving signal p and demodulates the modulated signal m and can output a voice signal of a specific channel, 500, and 500 'can be supplied with uniform power from the public address broadcast apparatus 400, A it is possible to output.

As a result, according to the present invention, a front-end broadcasting apparatus frequency-modulates an audio signal to be transmitted and provides the audio signal to a speaker via a transmission line, and the speaker demodulates the modulated signal and outputs a voice signal to reduce a transmission distance noise noise of the modulated frequency , It is possible to increase the transmission power of the broadcast contents through the speaker by reducing the noise even though the output amount of the voice signal is constant through the speaker regardless of the installation distance between the public address broadcasting apparatus and the speaker, It is possible to easily add and delete speakers and to restrict the installation position of the speaker. In addition, the channel selection unit of a speaker installed in a specific area is capable of outputting It is possible to output a voice signal according to the installation area of the speaker by simply selecting the frequency channel of the voice signal to be transmitted, Since the transmission device does not need to output different sound signals for each frequency channel separately, it is possible to simplify the facilities of the public address broadcasting device and to select the sound signal output for each zone from the speaker, There is provided a public address broadcasting system using frequency modulation capable of multi-broadcasting capable of providing different voice signals to a plurality of speakers arranged in a zone in the same time zone through a public hall broadcasting apparatus.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And the scope of the present invention should be understood as the following claims and their equivalents.

100: Whole-body broadcast apparatus according to the first embodiment
110: input unit
120: signal to be transmitted
130:
140:
150: Signal mixing section
160: Signal output section
200: Speaker according to the first embodiment
210:
220:
230: demodulator
240: Channel selector
250:
260: Output section
270:
200 ': another speaker
300: transmission means according to the first embodiment
310: Signal line
400: a public address broadcasting apparatus according to the second embodiment
410:
420: signal to be transmitted
430: Modulation section
440: driving signal generating unit
450: Signal output section
500: Speaker according to the second embodiment
510: Receiver
520: Demodulator
530: Channel selector
540:
550: Output section
560:
500 ': Another speaker
600: transmission means according to the second embodiment
610: first signal line
620: second signal line
S: Source source device

Claims (9)

Transmission means for transmitting a signal;
A method for generating a single composite speech signal by classifying and assigning a speech signal input from at least one sound source providing apparatus to a frequency channel corresponding to the sound source providing apparatus in a specific frequency band, (Hereinafter referred to as &quot; modulated signal &quot;) to the transmitting means; And
And a speaker for demodulating the frequency of the modulated signal and outputting a voice signal for each frequency channel of the demodulated complex voice signal,
The public address broadcasting apparatus includes:
An input unit for receiving a voice signal from at least one sound source providing apparatus;
A signal allocation unit for generating a single composite voice signal by classifying and assigning the voice signal input to the input unit to a frequency channel corresponding to the source providing apparatus;
A modulating unit for modulating a frequency of the composite voice signal generated from the signal-to-be-received portion and generating a modulated signal;
Wherein the public address broadcasting apparatus comprises: a driving signal generating unit for providing a driving signal for driving the speaker; And
And a signal output unit for outputting the modulation signal and the driving signal,
The speaker includes:
A receiving unit for receiving a signal through the transmitting unit;
A demodulator for demodulating the frequency of the modulated signal received through the receiver;
A channel selector for selecting a frequency channel in the complex speech signal demodulated through the demodulator;
An amplifying unit for amplifying a voice signal in a frequency channel selected from the channel selecting unit;
An output unit for outputting the audio signal amplified by the amplifying unit; And
And an output control unit for controlling amplification degree of the amplification unit,
The channel selection unit monitors a voice signal for each frequency channel of the composite voice signal demodulated by the demodulation unit and, when it is confirmed that a voice signal is included in an emergency channel that is a frequency channel to which a voice signal for notifying an emergency situation is allocated, Wherein the output adjusting unit amplifies the voice signal in the emergency channel selected by the channel selecting unit through the amplifying unit to a maximum value and outputs the amplified voice signal through the output unit
Public Address Broadcasting System Using Frequency Modulation.
delete delete The method according to claim 1,
Characterized in that the transmission means is provided with a transmission cable having a single signal line
Public Address Broadcasting System Using Frequency Modulation.
5. The method of claim 4,
The public address broadcasting apparatus includes:
And a signal mixing unit mixing the drive signal and the modulation signal to generate a single output signal and providing the single output signal to the signal output unit,
And the signal output unit outputs a single output signal mixed in the signal mixing unit to the transmission unit
Public Address Broadcasting System Using Frequency Modulation.
6. The method of claim 5,
The speaker includes:
And a signal separating unit for separating a driving signal and a modulating signal from the output signal received from the receiving unit and providing a modulating signal to the demodulating unit,
Wherein the output adjusting unit adjusts the degree of amplification of the acoustic signal of the amplifying unit by adjusting the intensity of the driving signal by providing the driving signal separated by the signal separating unit to the amplifying unit,
Public Address Broadcasting System Using Frequency Modulation.
The method according to claim 1,
Wherein the transmission means is provided with a transmission cable having at least two signal lines
Public Address Broadcasting System Using Frequency Modulation.
8. The method of claim 7,
Wherein the signal output unit of the public address broadcasting apparatus outputs the driving signal generated by the driving signal generating unit and the modulated signal generated by the modulating unit to different signal lines of the transmitting unit
Public Address Broadcasting System Using Frequency Modulation.
9. The method of claim 8,
Wherein the output adjusting unit adjusts the degree of amplification of the acoustic signal of the amplifying unit by adjusting the intensity of the driving signal by providing the driving signal received by the receiving unit to the amplifying unit,
Public Address Broadcasting System Using Frequency Modulation.

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