JP2017212750A - Reproduction system, terminal device, information providing method, operation method of terminal device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit information to a terminal device without requiring use of a reception apparatus exclusively used for radio communication.SOLUTION: A reproduction system 100 includes: a control unit 102 for obtaining an object signal representing an object sound; and a sound emission device 130 for emitting a sound including the object sound represented by the object signal and an acoustic component including identification information on related information representing the object sound, and thereby notifying a terminal device capable of obtaining the related information corresponding to the reported identification information of the identification information by acoustic communication.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for providing information to a terminal device.

  Services that provide users with public transport usage guidance using automatic voice are widely used. For example, in an in-car broadcast system for route buses, guidance voices prepared in advance for each route system (such as guidance voices for boarding / exiting guidance and fare information) at an appropriate timing according to the operation of the operator (for example, every stop) By playing, guidance information is provided to the users present in the vehicle. Patent Document 1 discloses a configuration that guides the name of a stop or the like to a user by generating an audio signal according to audio data. In Patent Document 2, in the creation of voice data corresponding to the guidance voice, the stop name is created by a coding method with a low compression rate, and common syllables such as “Next” and “I” are coded with a high compression rate. The structure created by law is disclosed.

Japanese Utility Model Publication No. 61-116400 Japanese Patent Laid-Open No. 08-008855

  By the way, in the configuration in which the guide information is transmitted to the terminal device by wireless communication (for example, short-range wireless communication) using infrared rays or electromagnetic waves including radio waves, the terminal device needs to include a receiving device for receiving radio waves and infrared rays. is there. An object of the present invention is to transmit information to a terminal device without requiring the use of a receiving device dedicated to wireless communication using infrared rays or electromagnetic waves including radio waves.

In order to solve the above problems, a playback system according to a preferred aspect of the present invention includes a control unit that acquires a target signal that represents a target sound, the target sound that the target signal represents, and a relationship that represents the target sound. A sound emitting device for notifying a terminal device capable of acquiring relevant information corresponding to the notified identification information by acoustic communication by emitting a sound including an acoustic component including the identification information of the information; It comprises.
The terminal device according to a preferred aspect of the present invention includes a sound collection device that collects a sound including a target sound and an acoustic component including identification information of related information representing the target sound, and the sound collection device includes: A specifying unit that extracts the identification information from the collected sound; and an acquisition unit that acquires related information corresponding to the identification information extracted by the specifying unit.

  By the way, a technique for distributing information to a terminal device using sound waves as a transmission medium is provided (hereinafter referred to as “acoustic communication”). In acoustic communication, information is transmitted to a terminal device by emitting sound representing an acoustic signal containing distribution information in a frequency band on the high frequency side (for example, about 18 kHz or more and 20 kHz or less in a non-audible range) of the acoustic signal. Distribution (sound collection). It is assumed that acoustic communication is applied to a route bus voice guidance system exemplified in Patent Document 1 and Patent Document 2. Normally, outside sounds such as engine sound and vibration sound arrive in the bus of the route bus, so that the guidance voice is clearly perceived by the user (for example, about 16 kHz or less in the audible range). ) Component is filtered (filtered), and the high-frequency component may be cut. For this reason, when acoustic communication is applied to Patent Literature 1 and Patent Literature 2, there is a problem that distribution information included in the high frequency band cannot be output (sound emission). In the above description, the route bus of public transportation is exemplified, but the same problem may occur in any situation where various information is provided to the user, such as other public transportation or public facilities. In view of the above circumstances, a preferred aspect of the present invention aims to appropriately realize acoustic communication even in an environment where a specific frequency band is suppressed.

  In order to solve the above problems, an acoustic processing device according to a preferred aspect of the present invention includes a first signal in a first frequency band that includes a target signal representing a target sound and a modulation signal including identification information of the target sound. An information extraction unit that extracts identification information from an acoustic signal, and a signal that includes the identification information extracted by the information extraction unit and that generates a second acoustic signal in a second frequency band different from the first frequency band And processing means. In the above configuration, the target signal representing the target sound (for example, the guidance voice provided to the user) and the modulation signal including the identification information of the guidance voice are included in the first acoustic signal in the first frequency band, Identification information extracted from the first acoustic signal is included in the second acoustic signal in the second frequency band. According to the above configuration, it is possible to appropriately transmit identification information by acoustic communication using the second frequency band even in an environment where the second frequency band is suppressed in the first acoustic signal. An example of “target sound” is the voice of guidance information provided to users of public facilities and public transportation (for example, facility information such as opening hours and closing times, boarding / exit guidance, fare guidance, etc.). It is done.

  In a preferred aspect of the present invention, the first sound signal is generated by collecting the reproduction sound of the reproduction signal including the target signal representing the target sound and the modulation signal on which the identification information of the target sound is superimposed. Sound means and sound emission means for emitting sound according to the second sound signal generated by the signal processing means. In the above aspect, the sound processing apparatus includes the sound collecting means for collecting the reproduced sound of the reproduced signal and the sound emitting means for emitting the sound corresponding to the second sound signal generated by the signal processing means. Therefore, there is an advantage that identification information can be appropriately transmitted by acoustic communication without modifying an existing system that emits sound according to a reproduction signal in which the second frequency band is suppressed.

  In a preferred aspect of the present invention, a time length during which sound corresponding to the second sound signal is emitted by the sound emitting means is longer than a time length during which the modulated signal is emitted from the reproduction signal. Therefore, there is an advantage that the opportunity to receive the identification information included in the second acoustic signal can be sufficiently secured on the receiving side. The first frequency band is set to an audible range, for example, and the second frequency band is set to a band higher than the first frequency band (for example, a band hardly perceivable by the user). Here, if the modulated signal including the identification information is emitted for an excessively long time, the user may perceive discomfort or discomfort. In the above configuration, the length of time that the sound corresponding to the second sound signal in the second frequency band is emitted is set to be longer than the time length that the modulation signal is emitted in the reproduction signal of the first frequency band. The That is, the identification information is transmitted by acoustic communication using the sound of the second frequency band that the user can hardly perceive. Therefore, the identification information can be notified to each terminal device without causing the user to feel uncomfortable or uncomfortable.

  An acoustic processing apparatus according to a preferred aspect of the present invention includes an information extraction unit that extracts identification information from a first acoustic signal including a target signal representing a target sound and a modulation signal including identification information of the target sound; A signal processing unit configured to generate a transmission signal including identification information extracted by the information extraction unit; and a transmission unit configured to transmit an electromagnetic wave indicating the transmission signal generated by the signal processing unit. According to the above aspect, for example, since it is possible to distribute information using various transmission media, it is possible to appropriately transmit identification information even in an environment where a specific frequency band is suppressed. is there.

  The acoustic processing device according to each of the above aspects is realized by a dedicated electronic circuit and also by cooperation of a general-purpose arithmetic processing device such as a CPU (Central Processing Unit) and a program. The program of the present invention can be provided in a form stored in a computer-readable recording medium and installed in the computer. The recording medium is, for example, a non-transitory recording medium, and an optical recording medium (optical disk) such as a CD-ROM is a good example, but a known arbitrary one such as a semiconductor recording medium or a magnetic recording medium This type of recording medium can be included. For example, the program of the present invention can be provided in the form of distribution via a communication network and installed in a computer. Moreover, this invention is specified also as the operating method (sound processing method) of the sound processing apparatus which concerns on each above aspect.

It is a figure showing composition of voice guidance system 1 of a 1st embodiment. 1 is a block diagram of a playback system 100 according to a first embodiment. It is a block diagram of the signal synthetic | combination part 104 of 1st Embodiment. It is a characteristic view of the filter 108 of 1st Embodiment. It is explanatory drawing of the time length of modulation signal AD, object signal AG, and 2nd acoustic signal S2. 3 is a flowchart of operations executed in the playback system 100. It is a block diagram of the sound processing apparatus 200 of 1st Embodiment. 5 is a flowchart of operations executed by the sound processing apparatus 200. It is a block diagram of terminal unit 300 of a 1st embodiment. It is explanatory drawing of the data structure of guidance information table TB1. It is explanatory drawing of the guidance information shown to the presentation part 308. FIG. It is a block diagram of the sound processing apparatus 200 of 2nd Embodiment. It is a block diagram of the sound processing apparatus 200 of 3rd Embodiment. It is a block diagram of the reproducing | regenerating system in a modification.

<First Embodiment>
An outline of the voice guidance system 1 of the first embodiment will be described. In the following description, a configuration in which the voice guidance system 1 according to the first embodiment is used for in-car broadcasting of public transportation is illustrated. In the voice guidance system 1, guidance voice (target sound) representing guidance information (getting on / off guidance, fare information, sightseeing guidance, surrounding information, etc.) is provided to the user of the route bus.

  FIG. 1 is a configuration diagram of a voice guidance system 1 according to the first embodiment. The voice guidance system 1 includes a reproduction system 100, an acoustic processing device 200, and a terminal device 300. The reproduction system 100 and the sound processing device 200 are installed in the vehicle C of the route bus.

  The reproduction system 100 emits sound in the frequency band B1 including identification information corresponding to each of a plurality of different guidance voices into the vehicle C together with the guidance voice. A user who gets on the vehicle C listens to the voice guidance. On the other hand, the sound processing apparatus 200 extracts identification information from the sound emitted by the reproduction system 100 and emits sound in the frequency band B2 including the identification information. The frequency band B1 is different from the frequency band B2. That is, the sound processing device 200 is a signal processing device that converts a sound frequency band including identification information.

  The terminal device 300 is a portable communication terminal (for example, a mobile phone or a smartphone) carried by a user who rides on the vehicle C, extracts identification information of guidance voice from the sound emitted by the sound processing device 200, and Guidance information corresponding to the identification information is received from the guidance information server 500 via a communication network (for example, a mobile communication network or the Internet) 400. Guidance information is information related to guidance by guidance voice. For example, usage guidance (facility guidance, fare guidance, etc.), traffic guidance (getting on / off guidance, transfer guidance, etc.), and tourist guidance (sightseeing) near the target location Character strings and images (still images or videos) of facilities, accommodation facilities, historic sites, etc.), character strings representing guidance voices (for example, character strings for visually impaired users to visually confirm guidance), guidance A voice or a character string obtained by translating the voice guidance into another language is provided as guidance information to the terminal device 300 and reproduced (sounded or displayed). Details of each element of the voice guidance system 1 will be described below.

<Reproduction system 100>
As illustrated in FIG. 1, the reproduction system 100 includes an operation unit 110, a reproduction processing device 120, and a sound emitting device 130. The operation unit 110 is an input device that receives an instruction from a route bus driver OP. Whenever the vehicle C approaches an arbitrary stop, the driver OP can instruct the reproduction of the guidance voice related to the stop by appropriately operating the operation unit 110. The reproduction processing device 120 is an acoustic signal (hereinafter referred to as “a mixed sound) of a guidance voice instructed by the driver OP through an operation on the operation unit 110 and a sound including identification information of the guidance voice among a plurality of different guidance voices. A2) is generated. The sound emitting device 130 (for example, a speaker) emits sound corresponding to the reproduction signal A2 generated by the reproduction processing device 120. In FIG. 1, only one sound emitting device 130 is shown, but actually, a plurality of sound emitting devices 130 are installed in the vehicle C, and the reproduction signal A2 is parallel to each of the reproduction processing devices 120. Supplied.

FIG. 2 is a block diagram showing the configuration of the playback system 100. As shown in FIG. As illustrated in FIG. 2, the reproduction processing device 120 according to the first embodiment includes a control unit 102, a signal synthesis unit 104, a storage unit 106, and a filter 108. The storage unit 106 is composed of a known recording medium such as a semiconductor recording medium or a magnetic recording medium, and for each point (stop) where the vehicle C stops, an acoustic signal (hereinafter referred to as “target”) representing guidance voice related to the point. ) AG (AG1, AG2,...) And identification information D (D1, D2,...) Of guidance information related to the point are stored. The target signal AG and the identification information D are not limited to the configuration stored in the storage unit 106 of the reproduction processing device 120. For example, the reproduction processing device 120 may receive the target signal AG and the identification information D from the external device by executing communication with the external device (server device).
The stop may include a stop that exists on the route of the route section of the route bus, as well as a place that becomes a boarding / exiting point (for example, a public transportation station, an airport, or a point on any public road). The identification information D is a unique code for identifying the guidance information, and is set for each point (stop) where the vehicle C stops. For example, a sequence of random numbers generated by a known method is set as the identification information D for each piece of guidance information so as not to overlap between different pieces of guidance information.

  In response to the reproduction instruction received from the driver OP by the operation unit 110 as the vehicle C approaches the stop, the control unit 102 in FIG. 2 outputs the target signal AG and the identification information D of the guidance voice corresponding to the stop. The data is read from the storage unit 106 and supplied to the signal synthesis unit 104. The signal synthesis unit 104 generates the reproduction signal A1 by superimposing the identification information D on the target signal AG. A known method can be arbitrarily employed for superimposing (acoustic watermarking) the identification information D on the target signal AG. For example, the method disclosed in International Publication No. 2010/016589 is suitable.

  FIG. 3 is a block diagram illustrating a configuration of the signal synthesis unit 104. As illustrated in FIG. 3, the signal synthesis unit 104 includes a modulation processing unit 1042 and a mixing processing unit 1044. The modulation processing unit 1042 includes the identification information D as an acoustic component in a specific frequency band by sequentially performing spread modulation of the identification information D using a spreading code and frequency conversion using a carrier wave of a predetermined frequency. An acoustic signal (hereinafter referred to as “modulation signal”) AD to be generated is generated. The frequency band of the modulation signal AD is a frequency band in which sound can be emitted by the sound emitting device 130 and collected by the sound processing device 200, and sound (voice or musical sound) that the user listens to in a normal environment. Frequency band (for example, about 16 kHz or less within the audible range). The mixing processor 1044 mixes (typically adds) the target signal AG supplied from the controller 102 and the modulation signal AD generated by the modulation processor 1042 to generate the reproduction signal A1.

  The filter 108 in FIG. 2 is a low-pass filter (LPF) that generates the reproduction signal A2 by suppressing the high-frequency component in the reproduction signal A1. FIG. 4 is a characteristic diagram of the filter 108 of the first embodiment. As illustrated in FIG. 4, the filter 108 is arranged on the high frequency side so that the guidance voice is clearly perceived by the user even in the vehicle C where noise such as engine sound and vibration sound arrives. The frequency band component (for example, 18 kHz or more and 20 kHz or less) is suppressed, and the component of the low frequency band B1 (for example, about 16 kHz or less in the audible range) corresponding to the guidance voice is maintained. The frequency band B1 is a frequency band in which sound can be emitted by the sound emitting device 130 and collected by the sound processing device 200, and the frequency band of sound (voice or musical sound) that the user listens to in a normal environment ( For example, it is included within the range of about 16 kHz or less within the audible range. The frequency band b of the modulation signal AD including the identification information D is included in the pass band (frequency band B1) of the filter 108. As understood from the above description, the frequency band B1 of the target signal AG and the modulation signal AD is set to a band that passes through the filter 108.

  FIG. 5A shows the length of time during which the sound of the reproduction signal A2 is emitted, the sound represented by the modulation signal AD included in the reproduction signal A2 (hereinafter referred to as “notification sound”), and the sound of the target signal AG (guidance voice). It is explanatory drawing with the time length of. The sound of the reproduction signal A2 is emitted over a time length T1. As illustrated in FIG. 5A, the notification sound of the modulation signal AD including the identification information D has a time length T1 during which the sound of the reproduction signal A2 is emitted over the time length TD from the start of the reproduction signal A2. Is included. The guidance voice represented by the target signal AG is emitted for a time length TG immediately after the sound of the modulation signal AD is emitted. The notification sound represented by the modulation signal AD is an aurally natural sound that alerts each user in the vehicle C (for example, a guidance sound such as “ping pawn”). The time length TD of the notification sound is set to a sufficiently short time (for example, about 1 to 2 seconds) compared to the time length TG of the guidance voice.

  FIG. 6 is a flowchart of a schematic operation of the reproduction processing apparatus 120 of the present embodiment. For example, when a guidance voice reproduction instruction is received from the driver OP via the operation unit 110 as the vehicle C approaches the stop (SA1), the control unit 102 corresponds to the point corresponding to the reproduction instruction. The target signal AG and the identification information D of the guidance voice are read from the storage unit 106 and supplied to the signal synthesis unit 104 (SA2). The signal synthesis unit 104 generates a reproduction signal A1 by mixing the target signal AG of the guidance voice supplied from the control unit 102 and the modulation signal AD including the identification information D supplied from the control unit 102 (SA3). . The filter 108 generates the reproduction signal A2 by extracting the frequency band B1 from the reproduction signal A1 generated by the signal synthesis unit 104 (SA4). The sound emitting device 130 emits sound corresponding to the reproduction signal A2 processed by the filter 108 (SA5).

<Sound processing apparatus 200>
FIG. 7 is a block diagram illustrating a configuration of the sound processing apparatus 200. The acoustic processing device 200 of the first embodiment is an acoustic device installed in the vicinity of the sound emitting device 130 of the reproduction system 100 (for example, the surface of the speaker net), and as illustrated in FIG. An information extraction unit 206, a storage unit 208, a signal processing unit 210, and a sound emitting device 214 are configured. The sound collection device 202 collects the reproduction sound of the reproduction signal A2 emitted from the sound emission device 130 of the reproduction system 100 and generates the first acoustic signal S1. As understood from the above description, the first acoustic signal S1 contains the acoustic component (notification sound) of the modulation signal AD including the identification information D and the acoustic component of the guidance voice in the frequency band B1. In the first embodiment, since the acoustic processing device 200 is disposed in the vicinity of the sound emitting device 130, the first acoustic signal S1 is not easily affected by noise.

  The information extraction unit 206 and the signal processing unit 210 in FIG. 7 are realized, for example, by an arithmetic processing unit (CPU) executing a program stored in the storage unit 208. The information extraction unit 206 extracts the identification information D by demodulating the first acoustic signal S1 generated by the sound collection device 202. Specifically, the information extraction unit 206 selects a band component of the frequency band b including the identification information D from the first acoustic signal S1, for example, using a band pass filter, and uses the spreading code used for the spread modulation of the identification information D. The identification information D is extracted by passing through a matched filter whose coefficient is. In the first embodiment, since the sound processing device 200 is disposed in the vicinity of the sound emitting device 130, even if the time length TD of the notification sound is set to a sufficiently short time compared to the time length TG of the guidance voice. It is possible to extract the identification information D with high accuracy. The identification information D extracted by the information extraction unit 206 is stored in the storage unit 208 (memory). As understood from the above description, the identification information D is notified from the reproduction system 100 to the sound processing device 200 by acoustic communication using sound (sound wave) as air vibration as a transmission medium.

  The signal processing unit 210 reads the identification information D extracted by the information extraction unit 206 from the storage unit 208, and sequentially performs spread modulation of the identification information D using a spreading code and frequency conversion using a carrier wave of a predetermined frequency. By executing this, a second acoustic signal (modulated signal) S2 containing the identification information D as an acoustic component of the high frequency band B2 is generated. The sound emitting device 214 emits sound according to the second sound signal S2 generated by the signal processing unit 210. In FIG. 7, an A / D converter that converts the reproduction signal A2 from analog to digital and a D / A converter that converts the second acoustic signal S2 from digital to analog are not shown for convenience. .

  As illustrated in FIG. 4, the frequency band B2 of the second acoustic signal S2 is different from the frequency band B1 of the first acoustic signal S1. That is, the frequency band B2 of the second acoustic signal S2 exceeds the frequency band B1 of the first acoustic signal S1. Specifically, the frequency band B2 is a frequency band in which sound can be emitted by the sound emitting device 214 and collected by the terminal device 300, and sound such as voice or musical sound that the user listens in a normal environment. Frequency band (for example, 18 kHz or more and 20 kHz or less) exceeding the frequency band (for example, about 16 kHz or less within the audible range). Therefore, the reproduced sound of the second acoustic signal S2 including the identification information D is hardly perceived by the user of the terminal device 300. That is, the identification information D can be transmitted to the terminal device 300 by acoustic communication without affecting the listening of the guidance voice by the user. As understood from the above description, in the first embodiment, the second acoustic signal S2 containing the identification information D as the acoustic component of the frequency band B2 different from the frequency band B1 of the reproduction signal A2 is generated. Even in a configuration in which the reproduction system 100 (filter 108) suppresses the frequency band B2 in order to emphasize the frequency band B1 of the guidance voice, the identification information D can be notified to each terminal device 300 by acoustic communication using the frequency band B2. Is possible.

  FIG. 5B is an explanatory diagram of the second acoustic signal S2. As illustrated in FIG. 5B, the signal processing unit 210 of the first embodiment generates the second acoustic signal S2 in which the identification information D is repeatedly added to different sections on the time axis. The sound represented by the second sound signal S2 is continuously emitted over a time length T2 after the information extraction unit 206 extracts the identification information D from the sound emitted by the sound emitting device 130. That is, the identification information D is repeatedly notified to each terminal device 300 by acoustic communication over the time length T2.

  As understood from the comparison between FIG. 5 (a) and FIG. 5 (b), the time length T2 at which the sound emitting device 214 of the sound processing device 200 emits the sound according to the second sound signal S2 is the reproduction system. 100 sound emitting devices 130 are longer than the time length TD for emitting the notification sound of the modulation signal AD. If the audible notification sound including the identification information D is emitted for an excessively long time, the user may perceive discomfort or discomfort. In the first embodiment, since the sound emission of the notification sound in the frequency band B1 is limited to the time length TD, the possibility that the user perceives the uncomfortable feeling or discomfort caused by the excessively long notification sound is reduced. The On the other hand, the signal processing unit 210 of the sound processing device 200 transmits the identification information D by acoustic communication using sound in the frequency band B2 that is hardly perceivable by the user, so that the user does not perceive discomfort or discomfort. The identification information D can be notified to each terminal device 300. Further, since the identification information D is repeatedly (sounded) from the acoustic processing device 200 over a time length T2 that exceeds the time length TD, for example, a part of the identification information of the second acoustic signal S2 due to the mixture of noise components. Even when D cannot be extracted, there is an advantage that the terminal device 300 can reacquire the identification information D of another section.

  On the other hand, the time length T2 of the second acoustic signal S2 can be arbitrarily set in relation to the time length TG in which the sound (guidance voice) of the target signal AG is emitted. A configuration in which the time length T2 of the second acoustic signal S2 is longer than the time length TG of the target signal AG (T2> TG), or a configuration in which the time length T2 of the second acoustic signal S2 is shorter than the time length TG of the target signal AG ( Either T2 <TG) or a configuration in which the time length T2 of the second acoustic signal S2 is equal to the time length TG of the target signal AG (T2 = TG) can be suitably employed. Since the sound of the second sound signal S2 does not affect the listening of the guidance voice by the user, as illustrated in FIG. 5, the time length T2 during which the sound of the second sound signal S2 is emitted and the target signal AG It may be configured to overlap with the time length TG at which sound (guidance voice) is emitted.

  FIG. 8 is a flowchart of a schematic operation of the sound processing apparatus 200. For example, when the reproduced sound of the reproduced signal A2 containing the modulation signal AD including the identification information D and the target signal AG is emitted from the sound emitting device 130, the process of FIG. 8 is started. The sound collection device 202 collects the reproduced sound emitted from the sound emission device 130 and generates the first acoustic signal S1 (SB1). The information extraction unit 206 extracts the identification information D from the first acoustic signal S1 (SB2). The signal processing unit 210 generates the second acoustic signal S2 including the identification information D (SB3). The sound emitting device 214 emits sound (sound wave) corresponding to the second sound signal S2 (SB4).

<Terminal device 300>
FIG. 9 is a block diagram illustrating a configuration of the terminal device 300. As illustrated in FIG. 9, the terminal device 300 includes a sound collection device 302, a specification unit 304, an acquisition unit 306, and a presentation unit 308. The sound collecting device 302 is an acoustic device (microphone) that picks up surrounding sounds, picks up the sound emitted from the sound emitting device 214 of the sound processing device 200, and represents an acoustic signal representing a time waveform of the sound. X (hereinafter referred to as “sound pickup signal”) is generated. The collected sound signal X contains the acoustic component of the identification information D. The A / D converter that converts the sound collection signal X generated by the sound collection device 302 from analog to digital is not shown for convenience.

  The identification unit 304 extracts the identification information D of the guidance information by demodulating the sound collection signal X generated by the sound collection device 302. Specifically, the specifying unit 304 emphasizes the band component of the frequency band B2 including the identification information D in the collected sound signal X with, for example, a high-pass filter, and determines the spreading code used for the spread modulation of the identification information D. The identification information D is extracted by passing through a matched filter as a coefficient.

  The acquisition unit 306 is a communication device that communicates with the guidance information server 500 via the communication network 400 (see FIG. 1). The communication method between the terminal device 300 and the guidance information server 500 is arbitrary, but typically, the wireless communication is different from the acoustic communication for notifying the terminal device 300 of the identification information D from the acoustic processing device 200. Communication (for example, information communication using radio waves or infrared rays as a transmission medium) is employed. The acquisition unit 306 transmits the information request R including the identification information D extracted from the collected sound signal X by the specifying unit 304 to the guidance information server 500, while the guidance information transmitted from the guidance information server 500 in response to the information request R. G is received.

  The guide information server 500 holds the guide information table TB1 of FIG. The guide information table TB1 associates the identification information D (D1, D2,...) With the guide information G (G1, G2,...). When receiving the information request R including the identification information D from the terminal device 300, the guidance information server 500 reads out the guidance information G associated with the identification information D in the information request R from the guidance information table TB1 and at the same time receives the information request R. The guide information G is transmitted to the terminal device 300 of the transmission source. The presentation unit 308 of FIG. 9 displays the guidance information G acquired by the acquisition unit 306 on a display device, for example, and presents it to the user.

  FIG. 11 is an explanatory diagram of a display example of the guidance information G by the presentation unit 308. In FIG. 11, the guidance information G presented on the presentation unit 308 of the terminal device 300 as a character string of the pronunciation content of the guidance voice is illustrated. As illustrated in FIG. 11, the user can visually confirm the guidance information G presented in the presentation unit 308 (getting on / off information in the example in the figure). As understood from the above description, the user visually confirms the guidance information G presented on the presentation unit 308 while listening to the guidance sound emitted from the sound emitting device 130 of the reproduction system 100. It becomes possible. According to the above configuration, the guidance information G can be provided visually and audibly to the user. In addition, there is an advantage that a hearing-impaired person (deaf person) can confirm the content of the guidance voice.

  In the first embodiment, the sound processing device 200 includes a sound collection device 202 and a sound emission device 214, and the reproduction signal A 2 emitted from the sound emission device 130 of the reproduction system 100 is collected by the sound collection device 202. On the other hand, the second sound signal S2 generated according to the sound collection signal X (first sound signal S1) is emitted by the sound emitting device 214. According to the above configuration, the reproduction system 100 is not changed to add a mechanism (signal processing unit 210) for converting an acoustic component including the identification information D in the reproduction signal A2 from the frequency band B1 to the frequency band B2. By installing the acoustic processing device 200 in the vicinity of the reproduction processing device 120, there is an advantage that the identification information D can be notified to the terminal device 300 by acoustic communication using the frequency band B2.

  In the above description, the case where the filter 108 of the reproduction system 100 suppresses the high frequency band B2 is exemplified. However, the cause of the suppression of the frequency band B2 in the sound emitted from the sound emitting device 130 is as follows. The processing is not limited to the filter 108. For example, even when the filter 108 does not exist, for example, when the sound emitting device 130 having an acoustic characteristic that hardly emits high-frequency sound including the frequency band B2 is used, the sound emitted from the sound emitting device 130 is used. There is a possibility that the frequency band B2 is suppressed. Although it is possible to use a sound emitting device that can emit the frequency band B2, it is practically difficult to repair all existing devices installed in the vehicle C such as a route bus. Further, since the sampling frequency of the target signal AG is low, the frequency band B2 can be suppressed even when the frequency band B2 is not included in the reproduction target. Regardless of the cause of suppression of the frequency band B2, the above-described effect that the identification information D can be transmitted by acoustic communication using the frequency band B2 is realized by applying the acoustic processing device of the first embodiment. The

  The sound corresponding to the second sound signal S2 is emitted over a time length T2 that exceeds the time length TD at which the sound of the modulation signal AD is emitted. When the notification sound including the identification information D is excessively long as compared with the guidance voice, for example, the user may perceive a sense of incongruity or discomfort. In the first embodiment, the time length TD at which the notification sound including the identification information D is emitted is configured to be shorter than the time length T2 of the second acoustic signal S2, so that it is audible and unnatural. It is possible to reduce the situation where pleasure is given to the user.

Second Embodiment
A second embodiment of the present invention will be described below. In addition, about the element which an effect | action and function are the same as that of 1st Embodiment in each form illustrated below, the code | symbol used by description of 1st Embodiment is diverted, and each detailed description is abbreviate | omitted suitably.

  FIG. 12 is a block diagram illustrating a configuration of the reproduction system 100 according to the second embodiment. In 1st Embodiment, the case where the sound processing apparatus 200 was installed in the vicinity of the sound emission apparatus 130 of the reproduction | regeneration system 100 was illustrated. As illustrated in FIG. 12, in the second embodiment, the sound processing device 200 is installed on the signal line between the reproduction processing device 120 and the sound emitting device 130 in the reproduction system 100.

  As understood from FIG. 12, the sound processing apparatus 200 of the second embodiment has a configuration in which the sound collection device 202 and the sound emission device 214 of the first embodiment are omitted. In the second embodiment, the reproduction signal A 2 whose frequency band B 2 is suppressed by the filter 108 of the reproduction processing device 120 is supplied to the information extraction unit 206 of the sound processing device 200. The information extraction unit 206 of the sound processing device 200 extracts the identification information D from the reproduction signal A2 (first sound signal) by the same method as in the first embodiment. On the other hand, the signal processing unit 210 generates the second acoustic signal S2 containing the identification information D extracted by the information extraction unit 206 as an acoustic component of the high frequency band B2 in the same manner as in the first embodiment. . The second acoustic signal S 2 in the frequency band B 2 generated by the signal processing unit 210 is emitted from the sound emitting device 130. The terminal device 300 acquires the guidance information G by extracting the identification information D from the sound reproduced by the sound emitting device 130. With the above configuration, since it is not necessary to provide the sound collection device 202 and the sound output device 214 in the sound processing device 200, there is an advantage that the device configuration can be simplified as compared with the first embodiment. In the first embodiment, it is necessary to secure the volume of the modulation signal AD so that the notification sound emitted from the reproduction processing device 120 can be reliably collected by the sound processing device 200. In the second embodiment, since the reproduction processing device 120 and the sound processing device 200 are connected by wire, it is possible to make the volume of the modulation signal AD as small as possible compared to the first embodiment. In the first embodiment, since the notification sound represented by the modulation signal AD is actually emitted, the notification sound needs to be an acoustically natural sound, but in the second embodiment, the modulation is performed as described above. Since the volume required for the signal AD is reduced, there is also an advantage that it is not necessary to have acoustically natural sound.

<Third Embodiment>
The acoustic processing device 200 according to the first embodiment transmits the identification information D to the terminal device 300 by acoustic communication using sound as a transmission medium, but the communication method for notifying the terminal device 300 of the identification information D is limited to acoustic communication. Not. The acoustic processing device 200 according to the third embodiment notifies the terminal device 300 of the identification information D by wireless communication (for example, short-range wireless communication) using electromagnetic waves including infrared rays and radio waves.

  FIG. 13 is a block diagram illustrating a configuration of the sound processing apparatus 200 according to the third embodiment. In FIG. 13, the sound emitting device 214 of the first embodiment is replaced with a transmission unit 216. The transmission unit 216 is a communication device that transmits an electromagnetic wave indicating the second acoustic signal S2 in the second frequency band generated by the signal processing unit 210. The specifying unit 304 of the terminal device 300 extracts the identification information D included in the received signal received from the sound processing device 200, and transmits the information request R including the identification information D to the guidance information server 500, thereby guiding the guidance information G. Receive. Even with the above configuration, it is possible to achieve the same effects as the embodiment.

  In the configuration of the third embodiment, the terminal device 300 needs to include a receiving device for receiving radio waves and infrared rays transmitted from the transmission unit 216. On the other hand, in the first embodiment and the second embodiment, since the identification information D is notified to the terminal device 300 by acoustic communication, the sound collection device 302 used for voice call and video recording is diverted to reception of the identification information D. There is an advantage that a dedicated receiving device corresponding to the communication method of the transmitting unit 216 is not required.

<Modification>
Each aspect illustrated above can be variously modified. Specific modifications are exemplified below. Two or more modes arbitrarily selected from the following examples can be appropriately combined within a range that does not contradict each other.

(1) In the reproduction system 100 of each embodiment described above, the configuration in which the signal synthesis unit 104 generates the reproduction signal A1 using the target signal AG and the identification information D stored in advance in the storage unit 106 is illustrated. It is also possible to prepare the reproduction signal A1 in advance.

  FIG. 14 is a block diagram illustrating a configuration of a reproduction system 100 according to a modification. In the reproduction system 100 of FIG. 14, the signal synthesis unit 104 exemplified in each of the above embodiments is omitted, and a reproduction signal A1 (A1-1) indicating a mixed sound of the target signal AG (guidance voice) and the notification sound of the identification information D is omitted. , A1-2,...) Are stored in advance in the storage unit 106 for each stop point. Each reproduction signal A1 stored in the storage unit 106 is generated in advance by the same method as the processing performed by the signal synthesis unit 104 of each embodiment described above. The control unit 102 acquires the reproduction signal A1 corresponding to the instruction from the driver OP from the storage unit 106 and supplies it to the filter 108. According to the above configuration, since it is not necessary to install the signal synthesis unit 104 in the reproduction system 100, the configuration of the reproduction system 100 is simplified (or an existing system without the signal synthesis unit 104 can be used). There are advantages.

(2) In the first embodiment, the configuration in which the modulation signal AD (notification sound) and the target signal AG (guidance voice) do not overlap on the time axis is illustrated (FIG. 5A). It is also possible to overlap the signal AG on the time axis. For example, a configuration in which the modulation signal AD is included at the beginning of the target signal AG is employed. However, when the modulated signal AD is emitted as the notification sound of the frequency band B1, listening to the guidance sound of the target signal AG may be hindered. Therefore, a configuration in which the modulation signal AD (identification information D) is mixed with the target signal AG by a method that is hardly perceivable by the listener without using the notification sound that can be heard by the user is preferable. For example, a technique of acoustic watermarking or fingerprinting can be employed for superimposing or extracting the identification information D with respect to the acoustic signal AG.

(3) In each form mentioned above, although the sound processing apparatus 200 was applied to the voice guidance system 1 of a route bus, the scene where the sound processing apparatus 200 is applied is not limited to the above illustration. For example, a configuration applied to an in-car broadcast system in other public transportation or a train, or a reproduction system in an exhibition facility can be suitably employed. For example, in a reproduction system in an exhibition facility, a reproduction sound in which the identification information D is superimposed on the target signal AG of the guidance voice for guiding the explanation of the exhibit is generated and then collected by the acoustic processing device 200. When the user carrying the terminal device 300 approaches an arbitrary work, the second acoustic signal S2 on which the identification information D is superimposed together with the guidance voice is emitted. The terminal device 300 carried by the user can confirm the guide information by displaying (or emitting sound) the guide information G provided from the guide information server 500 in response to the information request R including the identification information D. It is.

(4) In each of the above embodiments, the character string of the guidance voice provided to the user is exemplified as the guidance information G. However, the content of the guidance information G is not limited to the above examples. For example, public transportation and facility information (usage information, facility information, toll information, etc.), traffic information (station information, transfer information, etc.), and tourist information (tourist facilities, accommodation facilities, historic sites) Text strings and images (still images or moving images), character strings representing guidance voices (for example, character strings for visually impaired users to visually confirm guidance), guidance by guidance voices in other languages The translated voice or character string can be provided to the terminal device 300 as the guide information G. In the configuration in which the tourist information is provided to the user as the guide information G, a coupon or the like that can be used at the tourist facility or the accommodation facility may be presented together with the guide information G on the presentation unit 308.

(5) In the embodiment, the acquisition unit 306 of the terminal device 300 communicates with the guide information server 500 via the communication network 400 and transmits the information request R including the identification information D to the guide information server 500. Although the configuration for receiving the guide information G transmitted from the guide information server 500 according to R has been illustrated, the method for acquiring the guide information G in the terminal device 300 is not limited to the above examples. For example, the guide information table TB1 may be stored in the storage device of the terminal device 300, and the acquisition unit 306 may acquire the guide information G corresponding to the identification information D from the storage device.

(6) In the embodiment, the voice guidance system 1 including the reproduction system 100, the sound processing device 200, the terminal device 300, and the guidance information server 500 as individual devices has been exemplified. However, the device configuration of the voice guidance system 1 is as follows. It is not limited to the above illustration. For example, a configuration including the function of the guidance information server 500 on the terminal device 300 side as in Modification (4), or a device in which the playback system 100 and the sound processing device 200 are a single device as exemplified in the second embodiment. The configuration included in can also be suitably employed.

(7) In each of the above-described embodiments, the reproduction of the guidance voice representing the getting-on / off guidance for the passenger on the route bus is exemplified. However, the type of sound emitted by the sound emitting device 130 of the reproduction system 100 is the guidance voice. It is not limited. For example, the above-described embodiments can also be adopted when reproducing various sounds such as music. As understood from the above description, the reproduction signal A2 and the first acoustic signal S1 in the above-described forms are comprehensively expressed as signals indicating the sound (target sound) to be reproduced.

DESCRIPTION OF SYMBOLS 100 ... Playback system, 102 ... Control part, 104 ... Signal composition part, 106 ... Memory | storage part, 108 ... Filter, 110 ... Operation part, 130 ... Sound emission device, 1042 ... Modulation processing part,
1044 ... Mixing processing unit, 200 ... Sound processing device, 202 ... Sound collecting device, 206 ... Information extracting unit, 208 ... Storage unit, 210 ... Signal processing unit, 214 ... Sound emitting device, 300 ... ... Terminal device 302... Sound collecting device 304... Identification unit 308... Presentation unit 500.

Claims (5)

A control unit for acquiring a target signal representing the target sound;
By emitting a sound including the target sound represented by the target signal and an acoustic component including identification information of related information representing the target sound, the identification information is related information corresponding to the notified identification information. And a sound emitting device for notifying the terminal device capable of acquiring the sound by acoustic communication. A sound collection device for collecting a sound including a target sound and an acoustic component including identification information of related information representing the target sound;
A specific unit that extracts the identification information from the sound collected by the sound collection device;
A terminal device comprising: an acquisition unit that acquires related information corresponding to the identification information extracted by the specifying unit. The terminal device according to claim 2, wherein the acquisition unit transmits an information request including identification information extracted by the specifying unit to a server, and receives related information transmitted from the server in response to the information request. Comprising a storage device for storing a table associating identification information with related information;
The terminal device according to claim 2, wherein the acquisition unit acquires related information corresponding to the identification information extracted by the specifying unit, from a table stored in the storage device. The terminal device according to claim 2, wherein the related information is a character string or a voice expressed in a language different from the target sound.

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