JP2020068403A - Broadcasting system and computer program - Google Patents

Abstract

To more reliably and easily adjust audio output of each of a plurality of speakers while managing the audio output of the speakers.SOLUTION: A broadcast system 1 that manages the audio output of a plurality of speakers 20 includes a terminal device 50. The terminal device 50 collects a second audio signal in which first identification information ID1 for identifying the speaker 20 is embedded in a first audio signal from the speaker 20, and acquires the first identification information ID1 extracted from the second audio signal, and displays an interface for instructing to change the audio output of the speaker 20 identified by the acquired first identification information ID1 on a display unit.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a broadcasting system and a computer program.

  A PA (public address) system that collectively manages the outputs of a plurality of speakers has been introduced as a broadcasting system in vehicles of commercial facilities, public facilities, and transportation facilities.

JP, 2009-253421, A

  In such a PA system, depending on the installation location of the speaker, the sound output is difficult to hear, and conversely, the sound output is too loud. Therefore, it is necessary to individually adjust the volume. However, for example, when adjusting the audio output of each speaker via the network of the system, the operator may mistake the speaker to be operated or may not be able to immediately confirm the result of instructing the audio output adjustment. There is a nature. Particularly in a facility or a transportation facility where a large number of speakers are installed, it is complicated to individually adjust the audio output of each speaker.

  In view of the above-mentioned viewpoints, an object of the present invention is to provide a broadcasting system and a computer program capable of more reliably and easily adjusting the audio output of each speaker while managing the audio output of a plurality of speakers. is there.

  In order to solve the above problems, according to one aspect of the present invention, a broadcast system is a broadcast system that manages audio output of a plurality of speakers, and includes a broadcast device and a terminal device. The broadcasting device acquires a second audio signal in which the first identification information for identifying each speaker is embedded in the first audio signal, outputs the second audio signal to the speaker corresponding to the first identification information, and outputs the audio of the speaker. Adjust the output. The terminal device collects the second audio signal from the broadcasting device, acquires the first identification information extracted from the second audio signal, and instructs to change the audio output of the speaker specified by the acquired first identification information. To do.

  According to another aspect of the present invention, the computer program picks up a second audio signal in which the first identification information for identifying the speaker is embedded in the first audio signal from the speaker, and extracts the second audio signal from the second audio signal. The computer is caused to execute a function of acquiring the first identification information and displaying an interface on the display unit for instructing to change the audio output of the speaker specified by the acquired first identification information.

  According to the broadcasting system and the computer program of the present invention, it is possible to more reliably and easily adjust the audio output of each speaker while managing the audio output of the plurality of speakers.

The figure which shows the whole structure of the broadcasting system which concerns on one Embodiment. The figure which shows the structure of the broadcasting apparatus which concerns on one Embodiment. The figure which shows the structure of the management apparatus which concerns on one Embodiment. The figure which shows the example of speaker information. The figure which shows the structure of the terminal device which concerns on one Embodiment. The figure which shows the example of a display by the display part of the same terminal device. The flowchart which shows operation | movement of a broadcasting apparatus. Explanatory drawing of audio watermark processing. The flowchart which shows operation | movement of a management apparatus. The flowchart which shows operation | movement of a terminal device.

(Embodiment)
The configuration and function of the broadcasting system in the embodiment of the present invention will be described below. The broadcast system is a broadcast system applied to commercial facilities, public facilities, transportation facilities such as trains and buses, and is a system capable of adjusting the audio output of each speaker.

(1-1. Configuration)
(1-1-1. Configuration of broadcasting system)
As shown in FIG. 1, the broadcasting system 1 includes a broadcasting device 10 to which a plurality of speakers 20 are connected, a terminal device 50 carried by a user, and capable of collecting audio signals from nearby speakers 20, The management apparatus 30 is provided which can communicate with the broadcasting apparatus 10 and the terminal apparatus 50 via the network NW. The network NW is a communication network such as a mobile communication network, a LAN in a facility or a transportation facility, and the Internet.

  Each broadcasting device 10 has, for example, four channels as shown in FIG. 2, and is connected to four speakers 20. Although not shown, a plurality of broadcasting devices 10 are connected to the first floor 1F to the third floor 3F of the building according to the number of speakers 20 installed.

  As shown in FIG. 1, for example, in the first floor 1F, the sound from the speaker 20a is picked up by the nearby terminal device 50a. On the 3rd floor 3F, the terminal device 50b located nearby picks up the sound from the speaker 20b. There may be a plurality of terminal devices 50 corresponding to the number of users on each floor.

(1-1-2. Configuration of broadcasting device)
FIG. 2 schematically shows the configuration of the broadcasting device 10. The broadcasting device 10 causes the speaker 20 to output broadcast sound input via predetermined sound source data and a microphone (not shown), and adjusts the audio output of the speaker 20. The broadcasting device 10 includes a processor 11, a storage unit 13, a D / A conversion unit 15, an amplifier 16, and a communication unit 17.

  The processor 11 is a signal processing circuit such as a CPU and a DSP. The processor 11 controls each unit of the broadcasting device 10 by reading a program stored in a ROM (not shown) or a storage unit 13 into a RAM (not shown) and executing the program. The processor 11 executes, for example, the functions of the audio watermark processing unit 111, the audio acquisition unit 113, and the audio output control unit 115 according to the program. The voice watermark processing unit 111 performs a process of embedding the identification information ID1 (one example of the first identification information) of each speaker 20 in the first voice signal obtained from the voice data, as described later. The audio acquisition unit 113 acquires the second audio signal generated by the embedding process of the audio watermark processing unit 111. The audio output control unit 115 causes the corresponding speaker 20 to output the acquired second audio signal. The voice output control unit 115 also changes the voice output from the speaker 20 in response to an instruction from the management device 30, as described later.

  The storage unit 13 is composed of a semiconductor memory, a magnetic disk, or the like, and includes a voice data storage unit 131 and a speaker information storage unit 133. The audio data storage unit 131 stores audio data corresponding to predetermined broadcast content and audio data input via a microphone. The voice data corresponds to, for example, guidance information or evacuation information inside the facility. The speaker information storage unit 133 stores identification information of each speaker 20 connected to the broadcasting device 10.

  The communication unit 17 is an interface for connecting to the network NW, and is, for example, a network card or the like. The communication unit 17 is connected to the Internet via a network in the facility such as a LAN.

  Note that the broadcasting device 10 is not limited to a single computer device, and may include a plurality of computer devices.

  The broadcasting device 10 may have only one channel and be connected to one speaker 20. In this case, the speaker 20 may be integrated with the broadcasting device 10.

(1-1-3. Configuration of management device)
FIG. 3 schematically shows the configuration of the management device 30. The management device 30 is a computer device that functions as a server, and instructs the control of the audio output from the broadcasting device 10 to the speaker 20 according to the instruction from the terminal device 50. The management device 30 includes a processor 31, a storage unit 33, and a communication unit 37.

  The processor 31 is a signal processing circuit such as a CPU and a DSP. The processor 31 controls each unit of the management device 30 by reading a program stored in a ROM (not shown) or a storage unit 33 into a RAM (not shown) and executing the program. The processor 31 executes the functions of the speaker information transmitting unit 311, the voice output control instructing unit 313, and the voice state updating unit 315 according to the program, for example. The speaker information transmission unit 311 transmits the speaker information table 331 to the terminal device 50 in response to the request from the terminal device 50. The audio output control instructing unit 313 generates an instruction to control the audio output of the speaker 20 according to the instruction from the terminal device 50, and transmits the instruction to the broadcasting device 10 via the network NW. The voice output control instruction includes the identification information ID1 of the speaker 20 that is the operation target specified by the instruction from the terminal device 50, and the parameter of the voice output to be changed. The voice state update unit 315 updates the voice state stored in the voice state storage unit 333, as described later.

  Changing the sound output of the speaker 20 includes, for example, at least one of changing the volume, adjusting the sound output by the equalizer, adjusting the sound output by the compressor or / and limiter, and turning on and off the sound output.

  The storage unit 33 includes a semiconductor memory, a magnetic disk, or the like, and stores the speaker information table 331. The storage unit 33 also includes a voice state storage unit 333 that stores information indicating the voice state of each speaker. As shown in FIG. 4, the speaker information table 331 is a table in which the identification information ID1 of each speaker 20 and the position information of the speaker 20 are associated with each other. The voice output control instructing unit 313 refers to the speaker information table 331 and instructs the target speaker 20 to change the voice output. The voice state storage unit 333 stores parameters indicating the voice state of each speaker 20 (for example, various parameters indicating output volume, voice frequency characteristics, dynamic range, etc., information on whether voice output is ON or OFF, etc.). This audio state may be updated according to the change instructed by the audio output control instructing unit 313, or information may be acquired from the broadcasting device 10 that controls the audio output and updated.

  The communication unit 37 is an interface for connecting to the network NW, and is, for example, a network card or the like. The communication unit 37 is connected to the Internet via a local network, such as a LAN, in which the management device 30 is installed.

(1-1-4. Configuration of terminal device)
FIG. 5 schematically shows the configuration of the terminal device 50. The terminal device 50 is, for example, a smartphone or other mobile terminal, and is a computer device that is carried or used by a user in the facility. The terminal device 50 includes a processor 51, a storage unit 53, a voice input unit 55, a display unit 56, a communication unit 57, and an input operation unit 58.

  The processor 51 is a signal processing circuit such as a CPU and a DSP. The processor 51 controls each unit of the terminal device 50 by reading an application program stored in a ROM (not shown) or a storage unit 53 into a RAM (not shown) and executing the application program. The processor 51 executes the functions of the identification information extraction unit 511, the voice change instruction generation unit 513, and the voice state acquisition unit 515 according to the program, for example. The identification information extraction unit 511 extracts the identification information ID1 included in the audio signal acquired from the speaker 20, as described later. The voice change instruction generation unit 513 generates an instruction to change the voice output of the speaker 20 input according to the operation interface 560 (FIG. 6) displayed on the display unit 56. The voice output change instruction includes the identification information ID1 of the identified speaker 20 to be operated and the voice output parameter input by the input operation. The voice state acquisition unit 515 acquires the voice state of the speaker 20 to be operated from the management device 30 and displays it on the display unit 56.

  The storage unit 53 is configured by a semiconductor memory or the like, and includes a speaker information storage unit 531, a voice state storage unit 533, and an application storage unit 535. The speaker information storage unit 531 stores the speaker information table received from the management device 30. The voice state storage unit 533 stores the voice state of the speaker 20 to be searched, which is received from the management device 30. The application storage unit 535 stores a program that executes the functions of the processor. The voice input unit 55 is a microphone or the like and picks up voice from the speaker 20.

  The display unit 56 includes a display screen such as an LCD or an organic EL display that displays information acquired or generated by the processor 51. For example, as shown in FIG. 6, the display unit 56 displays an operation interface 560 for operating to change the audio output of the speaker 20 to be operated. The operation interface 560 includes a volume adjustment button 561, an equalizer button 562, a compressor (or limiter) button 563, and a mute button 564. By selecting each button, the output volume is changed, the frequency characteristic of the sound is changed, and the dynamic range is changed. And whether to turn on or off the voice output can be selected. The operation interface 560 also includes a bar 565 that can be operated to change the output volume, change the frequency characteristic of the sound, change the dynamic range, and the like according to the selection of the button. By changing the position of the bar 565 by a user operation, a parameter corresponding to a numerical value is input. The operation interface 560 further displays identification information 567 that identifies the speaker 20 to be operated. The specific information 567 may be identification information (number or character) uniquely assigned to each speaker 20, or may be information indicating the position of the speaker 20.

  The communication unit 57 is an interface for connecting to the network NW, and is, for example, an antenna for wireless communication. The communication unit 57 is connected to the management device 30 via the network NW.

  The input operation unit 58 is a unit that receives an operation input by the user, and is, for example, a keyboard, a mouse, a switch, a touch panel arranged on the display unit 56, or the like.

(1-2. Operation)
(1-2-1. Operation of Broadcasting Device)
The operation of the broadcasting device 10 will be described with reference to FIGS. 7 and 8. The audio acquisition unit 113 acquires audio data corresponding to the first audio signal from the audio data storage unit 131 (S111). The voice watermark processing unit 111 embeds speaker identification information ID1 in the first voice signal to generate a second voice signal (S112).

  The voice watermark processing unit 111 embeds the identification information ID1 in the first voice signal by using, for example, a known echo diffusion method. The echo diffusion method is a method in which an original voice signal is echoed with a delay time that is not noticeable to humans and the delay time is sent as additional data. In the echo diffusion method, as shown in FIG. 8, echo kernels of echo components having different delay amounts are superimposed and embedded in the first audio signal S1 by a convolution operation. As a result, the identification information ID1 is superimposed on the first audio signal S1, and the second audio signal S2 is generated.

  The voice acquisition unit 113 acquires the generated second voice signal, and the voice output control unit 115 outputs the generated second voice signal to the corresponding speaker 20 (the speaker of the embedded identification information ID1). (S113). It should be noted that the first audio signal and the second audio signal are perceived as audio to the extent that the difference is not noticeable at the human hearing level.

  For example, as shown in FIG. 1, the user's terminal device 50a picks up the second audio signal from the nearby speaker 20a on the first floor of the facility. The identification information ID1 “A1002” (FIG. 4) of the speaker 20a is embedded in the second audio signal. Similarly, on the third floor of the facility, the user's terminal device 50b picks up the second audio signal from the nearby speaker 20b. The identification information ID1 "A3005" (FIG. 4) of the speaker 20b is embedded in the second audio signal.

  When receiving the voice output control instruction from the management device 30 (Yes in S114), the voice output control unit 115 changes the voice output of the speaker 20 designated according to the instruction (S115).

(1-2-2. Operation of Management Device)
The operation of the management device 30 will be described with reference to FIG. When there is an access from the terminal device 50 (Yes in S131), the management device 30 is connected to the terminal device 50 (S132). At this time, the management device 30 may perform the authentication process of the terminal device 50 according to the user information registered in advance.

  When the speaker information transmission unit 311 receives the speaker information request from the terminal device 50 (Yes in S133), the speaker information transmission unit 311 transmits the speaker information table 331 of the storage unit 33 to the terminal device 50 (S134). When the voice output control instruction unit 313 receives the voice output change instruction from the terminal device 50 (Yes in S135), the voice output control instruction unit 313 generates a voice output control instruction according to the content of the instruction and transmits the voice output control instruction to the broadcasting device 10 (S136). The voice output control instruction includes the identification information ID1 of the operation target speaker 20 specified by the voice output change instruction from the terminal device 50, and the voice output parameter to be changed. The audio state updating unit 315 updates the audio state of the speaker 20 according to the change in the audio output (S137).

  For example, when there is an access from the user's terminal device 50a on the first floor of the facility shown in FIG. 1, the management device 30 transmits the speaker information table to the terminal device 50a. The management device 30 receives an audio output change instruction of the speaker 20a in response to the user's operation of the terminal device 50a, and instructs the broadcasting device 10 to control the audio output of the speaker 20a in response to the instruction.

(1-2-3. Operation of terminal device)
The operation of the terminal device 50 will be described with reference to FIG. In addition, in the terminal device 50, it is assumed that a predetermined application stored in the application storage unit 535 is activated.

  As described above, the terminal device 50 accesses the management device 30 and enters a state in which it can communicate with the management device 30 via the network NW (S151). First, the terminal device 50 transmits a request for the speaker information table to the management device 30 (S152). The speaker information table is received from the management device 30 and stored in the storage unit 53 (S153).

  When the voice signal (second voice signal) is picked up from the speaker 20 (Yes in S154), the terminal device 50 extracts the identification information ID1 from the voice signal (S155). For example, as shown in FIG. 1, in the case of the terminal device 50a of the user on the first floor of the facility, the second audio signal is picked up from the nearby speaker 20a. Identification information ID1 "A1002" is extracted from the second audio signal. Similarly, in the case of the terminal device 50b of the user on the third floor of the facility, the second audio signal is picked up from the nearby speaker 20b. Identification information ID1 "A3005" is extracted from the second audio signal.

  The extraction processing of the identification information ID1 is performed by extraction of a known echo diffusion method. Specifically, the identification information extraction unit 511 acquires the second audio signal acquired from the speaker 20, applies a window function to the logarithm after FFT (Fast Fourier Transform), and further executes an inverse FFT operation. And seek the so-called cepstrum. By calculating the cross-correlation between the cepstrum and the echo component for each window length, the identification information ID1 which is the embedded voice watermark information is reproduced and extracted.

  When the identification information extraction unit 511 can extract the identification information ID1 (Yes in S156), the identification information extraction unit 511 refers to the speaker information table stored in the storage unit 53 to determine whether there is the speaker 20 corresponding to the extracted identification information ID1. It is determined (S157). When there is the speaker 20 corresponding to the identification information ID1, the voice change instruction generation unit 513 causes the display unit 56 to display the operation interface 560 shown in FIG. 6 (S158). Further, the terminal device 50 may cause the display unit 56 to display a message indicating that the speaker 20 has been specified. For example, in the case of the terminal device 50a, a message such as "The elevator in the front corridor of the 1F △ 〇 store (102) has been specified", and in the case of the terminal device 50b "the elevator on the floor in front of the 3F elevator has been specified" is displayed. To display. This allows the user to more reliably recognize the speaker 20 to be operated. The message may be output as a voice from a voice output unit (not shown) such as a speaker included in the terminal device 50.

  When the input operation unit 58 accepts the change of the voice output via the operation interface 560 (S159), the voice change instruction generating unit 513 generates the voice output change instruction and transmits it to the management device 30 (S160). The voice output change instruction includes the identification information ID1 of the identified speaker 20 to be operated and the parameter of the voice output to be changed, which is received by the input operation unit 58. As a result, the user can operate the terminal device 50a to change the audio output of the speaker 20a. Similarly, the voice output of the speaker 20b can be changed by operating the terminal device 50b on the third floor of the facility.

  On the other hand, if the identification information ID1 cannot be extracted in step S156, or if the speaker 20 corresponding to the identification information ID1 extracted in step S157 does not exist, a message indicating that the corresponding speaker cannot be identified is displayed on the display unit 56. Alternatively, it is output by voice (S161).

(1-3. Features, etc.)
In the broadcasting system 1 according to the above-described embodiment, the terminal device 50 of the user collects the audio signal in which the identification information ID1 of the speaker 20 is embedded, and the speaker 20 identified by the identification information ID1 extracted from the audio signal. Instruct to change the audio output. Therefore, the voice output of the speaker 20 can be adjusted by the terminal device 50 located in the immediate vicinity of the speaker 20 to be operated, the risk of mistakenly selecting the speaker 20 to be operated can be reduced, and the user can immediately obtain the adjustment result of the voice output. I can confirm. Therefore, the sound output of each speaker 20 can be adjusted more reliably and easily.

  Further, since the terminal device 50 outputs the specific information of the operation target speaker 20, the user can more surely confirm the operation target speaker.

(Other embodiments)
(1)
In FIG. 10, when the speaker 20 to be operated cannot be specified, the terminal device 50 transmits its position information to the management device 30 by GPS information, information from an access point for wireless communication, or user input. Good. The management device 30 transmits the identification information of the identified speaker 20 to the terminal device 50 based on the position information of the terminal device 50 and the speaker position information in the speaker information table 331.

(2)
In the above-described embodiment, when the sound signals from the plurality of speakers 20 are picked up by one terminal device 50, the terminal device 50 measures, for example, the sound pressure and selects and identifies the sound signal having the higher sound pressure. The information ID 1 may be extracted.

(3)
In the above embodiment, the speaker information table is transmitted from the management device 30 to the terminal device 50, but the present invention is not limited to this. The management device 30 may specify the speaker 20 to be operated based on the instruction from the terminal device 50, and may transmit the position information of the speaker 20 and the information indicating the audio state.

(4)
In the above embodiment, the echo diffusion method is taken as an example of the voice watermark process (voice watermark information embedding process and extraction process), but the present invention is not limited to this. The voice watermark process may be executed using a known periodic phase modulation method, a known spread spectrum method, or the like.

(5)
Although the audio watermark processing unit 111 is provided in the broadcasting device 10 in the above embodiment, it may be provided in the management device 30. In this case, the management device 30 may generate a second audio signal in which the identification information ID1 is embedded and transmit the second audio signal to the broadcasting device 10.

  The audio data storage unit 131 of the storage unit 13 may be provided in the management device 30 according to the arrangement of the audio watermark processing unit 111.

(6)
Although the identification information extraction unit 511 is provided in the terminal device 50 in the above embodiment, it may be provided in the management device 30. In this case, the terminal device 50 transmits the second audio signal picked up from the speaker 20 to the management device 30, and the management device 30 extracts the identification information ID1 from the second audio signal. The management device 30 transmits the extracted identification information ID1 to the terminal device 50.

(7)
The management device 30 may be a plurality of devices that realize cloud computing instead of the server.

(8)
The management device 30 may be located remotely, or may be installed in a facility or a transportation facility to which the broadcasting system 1 is applied.

  The present invention can be applied as a broadcasting system used in facilities and transportation facilities.

DESCRIPTION OF SYMBOLS 1 ... Broadcasting system, 10 ... Broadcasting device, 11, 31, 51 ... Processor, 13, 33, 53 ... Storage part, 15 ... D / A conversion part, 16 ... Amplifier, 17, 37, 57 ... Communication part, 20 ... Speakers, 30 ... Management device, 50 ... Terminal device, 55 ... Voice input unit, 56 ... Display unit, 58 ... Input operation unit, 111 ... Voice watermark processing unit, 113 ... Voice acquisition unit, 115 ... Voice output control unit, 131 ... voice data storage unit 133 ... speaker information storage unit 311 ... speaker information transmission unit 313 ... voice output control instruction unit 315 ... voice state update unit 331 ... speaker information table 333 ... voice state storage unit 511 ... Identification information extraction unit, 513 ... Voice change instruction generation unit, 515 ... Voice state acquisition unit, 531 ... Speaker information storage unit, 533 ... Voice state storage unit, 535 ... Application storage unit

The audio output control unit 115, when receiving from the audio output control instruction to the management apparatus 30 (Yes in S114), and changes the audio output of the speaker 20 that is specified in response to the instruction (S115).

Claims (8)

A broadcasting system that manages the audio output of multiple speakers,
Obtaining a second audio signal in which the first identification information for identifying each speaker is embedded in the first audio signal, outputting the second audio signal to the speaker corresponding to the first identification information, and outputting the audio of the speaker. A broadcasting device for adjusting
The second audio signal is collected from the broadcasting device, the first identification information extracted from the second audio signal is acquired, and the audio output of the speaker specified by the acquired first identification information is changed. A terminal device for instructing,
A broadcasting system equipped with. Changing the audio output of the speaker includes at least changing the volume,
The broadcasting system according to claim 1. The terminal device includes a display unit that displays an interface for operating a change in the audio output of the identified speaker,
The broadcasting system according to claim 1 or 2. The interface includes location information of the identified speaker,
The broadcasting system according to claim 3. Furthermore, a management device communicatively connected to the terminal device is provided,
The management device is
Storing speaker information in which the first identification information of the plurality of speakers and the position information of each speaker are associated with each other,
Transmitting the speaker information to the terminal device in response to a request from the terminal device,
The broadcasting system according to any one of claims 1 to 4. The management device receives an instruction from the terminal device, and instructs the broadcast device to change the audio output of the identified speaker according to the instruction.
The broadcasting system according to claim 5. Collecting a second audio signal in which the first identification information for identifying the speaker is embedded in the first audio signal from the speaker,
Acquiring the first identification information extracted from the second audio signal,
Displaying an interface on the display unit for instructing to change the audio output of the speaker specified by the acquired first identification information,
A program that causes a computer to execute a function. Obtaining speaker information in which first identification information of the plurality of speakers and position information of the plurality of speakers are associated with each other,
Extracting the first identification information from the second audio signal,
A speaker for instructing to change the audio output is specified based on the extracted first identification information and the speaker information;
The program according to claim 7, which causes a computer to execute a function.

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