JP2018063272A - Voice dialogue apparatus, voice dialogue system, and control method of voice dialogue apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voice dialogue apparatus capable of correcting a dialogue content with a user with a simple method.SOLUTION: A voice dialogue apparatus 20A for carrying out a dialogue via voices with a user, includes: plural holding parts 103 for holding a piece of dialogue information representing the contents of the dialogue in which each of the plural holding parts is associated with an attribute of the terminology, and the plural holding parts hold the terminologies having the attribute; a storage part 104 that stores a history of the terminologies held by the plural holding parts; an acquisition part 101 that acquires a piece of speech data of uttered terminologies included in the data and causes a holding part associated with the attribute of the uttered terminology in the plural holding parts to hold; and a change part 102 that, when the speech data acquired by the acquisition part includes a control terminology for controlling the dialogue information, changes the terminology held by each the plural holding part 103 to the terminology held by the holding part at a past point specified identified the control terminology while referring the history stored in the storage part.SELECTED DRAWING: Figure 8

Description

  The present disclosure relates to a voice interaction device, a voice interaction system, and a control method of the voice interaction device.

  Patent Document 1 discloses an interactive sequence recognition device that presents a vocabulary group expected to be input next so that the user can visually recognize it based on information input from the user. This prevents the inconvenience that the user is at a loss due to erroneous recognition of the dialogue.

JP 2001-34292 A

  The present disclosure provides a voice interactive apparatus that corrects the content of a dialog with a user by a simple method.

  The voice interaction device according to the present disclosure is a voice interaction device that performs a voice dialogue with a user, and is a plurality of holding units for holding dialogue information indicating the content of the dialogue, each of the plurality of holding units Are associated with the attribute of the term, each storing a plurality of holding units for holding a term having an attribute associated with the holding unit, and a history of terms held by the plurality of holding units. And utterance data indicating the content of the utterance by the user's voice, and the utterance term included in the obtained utterance data is associated with the attribute of the utterance term among the plurality of holding units When the acquisition unit to be held by the holding unit and the utterance data acquired by the acquisition unit include a control term for controlling the conversation information, refer to the history stored in the storage unit , The term respective serial plurality of holding portions holds, and a changing unit that changes the terms in which the holding portion is retained in the past time specified by the control terms.

  The voice interaction device according to the present disclosure can correct the content of the dialogue with the user by a simple method.

The block diagram which shows the structure of the voice interactive apparatus and voice dialogue system which concern on embodiment. Explanatory drawing of the presentation by the speech dialogue system which concerns on embodiment. The 1st explanatory view of the dialogue sequence and history information concerning an embodiment. The flowchart of the main process by the voice interactive apparatus which concerns on embodiment. The flowchart of the restoration process by the voice interactive apparatus which concerns on embodiment. The flowchart of the restoration point setting process by the voice interactive apparatus which concerns on embodiment. The 2nd explanatory view of the dialogue sequence and history information concerning an embodiment. The block diagram which shows the structure of the voice interactive apparatus which concerns on the modification of embodiment. The flowchart which shows the control method of the voice interactive apparatus which concerns on the modification of embodiment.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventor (s) provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is intended to limit the subject matter described in the claims. Not what you want.

(Embodiment)
In the present embodiment, a voice dialogue apparatus for correcting the contents of dialogue with a user by a simple method will be described. The voice dialogue apparatus according to the present embodiment performs voice dialogue with the user, generates and corrects dialogue information indicating the content of the dialogue with the user, and outputs the dialogue information to an external processing device. . Further, the voice interaction device acquires the processing result from the external processing device and presents it to the user, and further continues the dialogue with the user. As described above, the voice interaction device sequentially presents the processing results to the user while generating and correcting the interaction information based on the interaction with the user.

  The voice interaction device is useful when an operation such as key input or panel touch by the user is impossible or difficult. For example, there may be applications such as a car navigation device that searches information while sequentially receiving instructions from the user's voice when the user is driving. It is also useful in a voice interaction device that does not have a user interface such as a key or a panel.

[1-1. Constitution]
FIG. 1 is a block diagram showing a configuration of a voice interaction device 20 and a voice interaction system 1 according to the present embodiment.

  As shown in FIG. 1, the voice dialogue system 1 includes a display device 10, a speaker 11, a voice synthesis unit 12, a microphone 13, a voice recognition unit 14, a voice dialogue device 20, and a task processing unit 40. Is provided.

  The display device 10 is a display device that includes a display screen. The display device 10 displays an image on the display screen based on the display data acquired from the voice interaction device 20. The display device 10 is realized by, for example, a car navigation device, a smartphone (high function mobile phone terminal), a mobile phone terminal, or a PC (Personal Computer). Although the display device 10 is shown as an example of a device that displays an image based on information presented by the voice interaction device 20, a speaker that outputs information presented by the voice interaction device 20 as a voice instead of the display device 10. May be used. This speaker may be shared with the speaker 11 described later.

  The speaker 11 is a speaker that outputs sound. The speaker 11 outputs sound based on the sound signal acquired from the sound synthesizer 12. The sound output from the speaker 11 is heard by the user.

  The voice synthesis unit 12 is a processing unit that converts a response sentence into a voice signal. The voice synthesizing unit 12 acquires a response sentence, which is information transmitted from the voice dialogue apparatus 20 to the user, from the voice dialogue apparatus 20, and generates a voice signal to be output by the speaker based on the obtained response sentence.

  Note that the speaker 11 and the voice synthesizing unit 12 may be provided inside the voice dialogue device 20 as one function of the voice dialogue device 20 or may be provided outside the voice dialogue device 20. The voice synthesizer 12 may be realized as a so-called cloud server so as to be able to communicate with the voice interaction device 20 via the Internet. In that case, the connection between the voice synthesizer 12 and the voice interaction device 20 and the connection between the voice synthesizer 12 and the speaker 11 are made through a communication path via the Internet.

  The microphone 13 is a microphone that acquires sound. The microphone 13 acquires the user's voice and outputs an audio signal based on the acquired voice.

  The voice recognition unit 14 is a processing unit that generates speech data by performing voice recognition on the user's voice. The voice recognition unit 14 acquires the voice signal generated by the microphone 13 and performs voice recognition processing on the acquired voice signal, thereby generating utterance data of the user's utterance. The utterance data is information transmitted from the user to the voice interaction device 20, and is expressed by characters (text) such as “I want to eat Chinese”. Note that since the speech recognition process converts a speech signal into text information, it can also be referred to as a text conversion process.

  Note that the microphone 13 and the voice recognition unit 14 may be provided inside the voice dialogue device 20 as one function of the voice dialogue device 20 as in the voice synthesis unit 12 or the like, or provided outside the voice dialogue device 20. May be. In addition, the voice recognition unit 14 may be realized as a cloud server like the voice synthesis unit 12.

  The task processing unit 40 is a processing unit that performs processing based on the content of the dialogue between the user and the voice interaction device 20 and outputs information indicating the processing result or related information. The processing by the task processing unit 40 may be any information processing based on the content of the dialogue. For example, the task processing unit 40 may execute a search process for searching a Web page of a restaurant that matches the content of the conversation from a Web page on the Internet, and output the search result. explain. Note that the unit of execution of processing by the task processing unit 40 is also referred to as a task. The task processing unit 40 corresponds to a processing unit.

  As another example of the process by the task processing unit 40, a process for accumulating the contents of the dialogue as data may be executed, and information indicating the success or failure of the process may be output. In addition, the task processing unit 40 may identify an electric device to be controlled among a plurality of electric devices based on the content of the dialogue, and may output specific information or information on the operation of the electric device.

  The voice interaction device 20 is a processing device that performs a voice interaction with a user. The spoken dialogue apparatus 20 generates and corrects dialogue information indicating the content of the dialogue with the user, and outputs the dialogue information to the task processing unit 40. The voice interaction device 20 acquires the processing result from the task processing unit 40 and presents it to the user, and further continues the dialogue with the user.

  The voice interaction device 20 includes a response sentence generation unit 21, an utterance data acquisition unit 22, a sequence control unit 23, a task control unit 24, an operation unit 25, an analysis unit 26, a memory 27, and a task result analysis unit. 28 and a presentation control unit 29.

  The response sentence generation unit 21 is a processing unit that acquires a response instruction from the sequence control unit 23 and generates a response sentence based on the acquired response instruction. The response sentence is information transmitted from the voice interaction device 20 to the user. Specifically, the response sentence is a sentence for prompting the user to speak such as “Please specify a region”, such as “I understand”. It is a sentence explaining the operation of the voice interactive apparatus 20 such as the user's utterance or “searching”. What kind of response instruction is given at what time will be described in detail later.

  The utterance data acquisition unit 22 is a processing unit that acquires utterance data of a user's utterance from the speech recognition unit 14. When the user's voice is uttered, the microphone 13 and the voice recognition unit 14 generate utterance data indicating the content of the utterance, and the utterance data acquisition unit 22 acquires the generated utterance data. Further, the utterance data acquired by the utterance data acquisition unit 22 may include control terms for changing the content of the dialogue to that at the past time. Utterance data including control terms is also referred to as control utterance data. Note that the utterance data acquisition unit 22 corresponds to one function of the acquisition unit.

  The sequence control unit 23 is a processing unit that realizes a dialogue with the user by controlling a dialogue sequence of the dialogue between the voice dialogue apparatus 20 and the user. Here, the dialogue sequence is data in which utterances by the user in the dialogue and responses by the voice dialogue apparatus 20 are arranged in time series. The sequence control unit 23 corresponds to one function of the acquisition unit.

  Specifically, the sequence control unit 23 acquires the utterance data of the user's utterance from the utterance data acquisition unit 22. Then, based on the acquired utterance data, the previous interaction sequence with the user, or the processing result acquired from the task result analysis unit 28, an instruction to create a response sentence to be presented to the user (hereinafter referred to as “response”). Is also referred to as “instruction”, and is sent to the response sentence generation unit 21. What kind of response instruction is generated in what case by the sequence control unit 23 will be specifically described later.

  Further, the sequence control unit 23 extracts a term (also referred to as an utterance term) from the acquired utterance data, and stores the extracted term in the slot 31 associated with the attribute of the term via the operation unit 25. , Keep it. Here, the term refers to a relatively short word such as a word. For example, one noun or one adjective corresponds to one term.

  The task control unit 24 is a processing unit that outputs the content of the dialogue between the voice interactive device 20 and the user to the task processing unit 40 and causes the task processing unit 40 to execute processing based on the output content of the dialogue. Specifically, the task control unit 24 outputs the terms held in the plurality of slots 31 to the task processing unit 40. Further, the task control unit 24 determines whether or not a predetermined condition regarding the state of the plurality of slots 31 is satisfied, and the term held by the plurality of slots 31 is determined only when the predetermined condition is satisfied. You may make it output to the task process part 40. FIG. The task control unit 24 corresponds to one function of the external processing control unit.

  The operation unit 25 is a processing unit that adds, deletes, or changes information indicating the content of the dialogue stored in the memory 27. Specifically, the operation unit 25 refers to the history table 32 when the utterance data acquired by the utterance data acquisition unit 22 includes a control term for controlling the conversation information. The term held by each slot is changed to the term held by the slot 31 at the past time specified by the control term. Further, the operation unit 25 may set a restoration point in a predetermined record on the history table 32 in response to an instruction from the task result analysis unit 28. The operation unit 25 corresponds to one function of the acquisition unit and one function of the change unit.

  The analysis unit 26 is a processing unit that analyzes the slot 31 or the history table 32 in the memory 27 and notifies the sequence control unit 23 according to the analysis result. Specifically, the analysis unit 26 determines whether or not each of the slots of the essential slot group of the slots 31 holds a term. The control unit 23 is notified. The analysis unit 26 corresponds to one function of the changing unit.

  Further, the analysis unit 26 uses the operation unit 25 to perform a restoration process for restoring the content of the dialogue to a past time point. When performing the restoration process, the analysis unit 26 determines whether there are a plurality of restoration points set in the history table 32. If it is determined that there are a plurality of restoration points, A condition for selecting one of them is sent to the sequence control unit 23. Specific processing contents of the restoration processing will be described in detail later.

  The memory 27 is a storage device that stores the contents of the dialogue. Specifically, the memory 27 has a slot 31 and a history table 32.

  The slot 31 is a storage area for holding dialogue information indicating the contents of the dialogue, and a plurality of slots are provided in the voice dialogue device 20. Each of the plurality of slots 31 is associated with a term attribute, and holds a term having an attribute associated with the slot 31. The entire terms stored in each of the slots 31 indicate the dialogue information. The slot 31 holds one term. When the slot 31 holds a new term in a state where one term is held, the held one term is deleted from the slot 31.

  Here, the term attribute is information indicating the nature, feature, or category of the term. For example, when the processing of the task processing unit 40 is a restaurant search, the dish name, area, budget, existence of a private room, existence of a parking lot, required time on foot from the nearest station, whether or not chartering is possible, or Information such as whether or not a night view is visible can be used as an attribute. Note that holding a term in the slot 31 can also be expressed as storing or registering a term in the slot 31. Note that the area of the slot 31 in the memory 27 corresponds to a holding unit.

  Further, the slot 31 may be provided with two types, that is, an essential slot and an optional slot. The essential slot is a slot in which the task control unit 24 does not output the term to the task processing unit 40 unless the slot holds the term. An option slot is a slot in which the task control unit 24 outputs a term to the task processing unit 40 if all the essential slots hold the term even if the option slot does not hold the term. is there. For example, when a search task is executed as task processing, when the task control unit 24 outputs the terms held in all slots to the task processing unit 40, all slots included in the essential slot group hold the terms. The output may be performed only in the case of Whether the slot 31 is an essential slot or an optional slot is predetermined for each slot 31. When the above two types are not provided and only one type is provided, all of the slots 31 may be required slots or optional slots. Which of these may be determined as appropriate based on the processing of the task processing unit 40 or the content of the dialogue.

  The history table 32 is a table showing the history of terms held by the plurality of slots 31. Specifically, the history table 32 is a table in which the terms held in the past by the plurality of slots 31 and the terms currently held are stored in time series. By holding a new term in the slot 31, even when the term held immediately before is deleted from the slot 31, the deleted term remains in the history table 32.

  The history table 32 may store information indicating the time at that time (for example, a time stamp) together with terms held by the plurality of slots 31 in the past. In addition, if there is a premise that records are additionally stored as time progresses, the history table 32 may store only terms held by a plurality of slots 31 in the past. Note that the area of the memory 27 in which the history table 32 is stored corresponds to a storage unit.

  The task result analysis unit 28 is a processing unit that acquires a processing result obtained by the task processing unit 40 and analyzes the acquired processing result. When the task result analysis unit 28 acquires the processing result from the task processing unit 40, the task result analysis unit 28 analyzes the acquired processing result and passes the analysis result to the sequence control unit 23. This analysis result is used when the operation unit 25 determines whether or not to set a restoration point at a time corresponding to the current time in the history table 32. The task result analysis unit 28 corresponds to one function of the external processing control unit.

  For example, the task result analysis unit 28 acquires the title and URL (Uniform Resource Locator) of the Web page on which the searched information is posted as a result of the restaurant search process by the task processing unit 40. Further, the task result analysis unit 28 analyzes the result of the search process and calculates the number of searched information. Then, the task result analysis unit 28 may set the restoration point only when the number of retrieved information is the number suitable for browsing by the user (for example, about 1 to 30 cases). In addition, the task result analysis unit 28 prohibits setting a restoration point when the number of retrieved information items is not suitable for browsing by the user, such as 0 or 100 or more. It may be.

  In addition, the task result analysis unit 28 may set a restoration point when all of the slots of the essential slot group hold the term, or hold it while the slot 31 holds the term. A restoration point may be set at a point in time when the state changes to a state that holds a term different from the existing term.

  The presentation control unit 29 is a processing unit that generates presentation data to be presented to the user by the display device 10 and outputs the presentation data to the display device 10. The presentation control unit 29 acquires the processing result from the task processing unit 40, arranges the position on the screen of the display device 10 so that the user can browse the processing result effectively, and outputs it to the display device 10 The presentation data is output to the display device 10 after being converted into a suitable data format.

  Note that part or all of the functions of the voice interaction device 20 and the task processing unit 40 may be implemented as a cloud server, like the voice synthesis unit 12 and the like.

  FIG. 2 is an explanatory diagram of presentation by the voice interaction system 1 according to the present embodiment. The explanatory diagram shown in FIG. 2 is an example of an image displayed on the display screen when the display device 10 presents the processing result by the task processing unit 40 to the user.

  On the left side of the display screen, character strings 201 to 205 indicating attributes are displayed. Character strings 201 to 205 are character strings indicating attributes of the plurality of slots 31.

  Terms 211 to 215 are displayed on the right side in the display screen. The terms 211 to 215 are terms held by the slots 31 associated with the attributes of the character strings 201 to 205, respectively.

  A character string 206 and result information 216 are shown on the lower side of the display screen. The character string 206 is a character string indicating that what is displayed below the character string 206 is a search result. The result information 216 is information indicating a result of the restaurant search performed by the task processing unit 40 based on the terms 211 to 215.

  Thus, the content of the dialogue and the result information that is the processing result by the task processing unit 40 based on the content of the dialogue are displayed on the display device 10, and the user knows the processing result in which the content of the dialogue is reflected. Can do.

  The image displayed on the display screen is not limited to that shown in FIG. 2, and the displayed information, the presence / absence of display such as its arrangement, and the display position may be arbitrarily changed.

  FIG. 3 is a first explanatory diagram of a dialogue sequence and history information according to the present embodiment.

  In FIG. 3, the dialog sequence 310, the history table 320, and the search result 330 are shown together with the time series of the dialog sequence. Note that one row shown in FIG. 3 corresponds to one time point. This line is also called one record.

  The dialogue sequence 310 is data in which utterances by the user in the dialogue and responses by the voice dialogue apparatus 20 are arranged in time series.

  The time information 311 (time stamp) is time information indicating the time when the user uttered or responded by the voice interaction apparatus 20.

  The utterance 312 is utterance data indicating the utterance by the user at the time. Specifically, the utterance 312 is utterance data indicating the utterance by the user's voice acquired by the utterance data acquisition unit 22 via the microphone 13 and the voice recognition unit 14.

  The response 313 is a response sentence indicating a response by the voice interaction device 20 at the time. Specifically, the response 313 is generated by the response sentence generation unit 21 in response to a response instruction from the sequence control unit 23.

  The history table 320 includes information on an essential slot group 321, an option slot group 322, an action 323, and a restoration point 324. The history table 320 is information indicating the history of the slot 31 stored in the history table 32, and is shown in time series of the time information 311 of the dialogue sequence 310. The history table 320 is an example of the history table 32.

  The essential slot group 321 is a term held in an essential slot among the slots 31 at the time. The essential slot group 321 includes, for example, terms of attributes of “dishes name”, “region”, and “budget”.

  The option slot group 322 is a term held in the option slot of the slots 31 at the time. The option slot group 322 includes, for example, attribute terms of “presence / absence of private room” and “presence / absence of parking lot”.

  The action 323 is information indicating processing executed by the voice interactive apparatus 20 at the time, and a plurality of pieces of information may be stored. For example, when a new term is held in a slot 31 with a certain attribute, the name of the attribute and a character string “register” are set at the time point to indicate that. In addition, when the task control unit 24 outputs a term to the task processing unit 40 to search for information, a character string “search” is set. Further, when the operation unit 25 changes the term held in the slot 31 to that at the past time point, the character string “restore” is set.

  The restoration point 324 is information indicating whether or not a restoration point is set at the time point. At the time when the restoration point is set, “1” is set. It is determined whether or not the restoration point is set by the task result analysis unit 28, and is set in the history table 320 by the operation unit 25.

  The search result 330 is the number of search processing results by the task processing unit 40 at the time. The search result 330 is set by the task result analysis unit 28.

  The dialogue sequence shown in FIG. 3 is a case where the user changes the contents of the dialogue to those at the past time intended by the user in the dialogue for performing restaurant search under different search conditions while changing the search conditions. belongs to.

  At the time corresponding to the records R1 to R7, the terms included in the user's utterance are sequentially acquired by the utterance data acquisition unit 22 and the like, and each of the acquired terms is stored in the slot 31 corresponding to the attribute of the term. .

  At the time corresponding to the record R8, the first search process based on the term held in the slot 31 is performed by the task processing unit 40. This is performed when the term is stored in all the slots 31 included in the essential slot group at the time corresponding to the record R7.

  At the time corresponding to the records R9 to R16, search processing based on the terms held in the slot 31 is performed. In this case, the search processing is sequentially performed while changing the search word so that the search result desired by the user can be obtained.

  At the time corresponding to the record R17, the user makes a control utterance to return the content of the dialogue to a past time. This is because the search result at the time corresponding to the record R14 or R16 was 0, and the user intended to return to the search conditions of the past time before the number of searches became 0. Is.

  In the records R18 to R20, the terms held in the slots 31 are restored to those in the record R10.

  By doing in this way, the voice interactive apparatus 20 can return the content of the dialog to a past time point based on the speech by the user's voice, and continuously execute a new dialog from the state. In this way, the voice interaction device can correct the content of the dialogue with the user by a simple method.

[1-2. Operation]
The operations of the voice interaction device 20 and the voice interaction system 1 configured as described above will be described below.

  FIG. 4 is a flowchart of main processing by the voice interaction apparatus 20 according to the present embodiment.

  In step S <b> 101, the microphone 13 acquires the voice of the user's utterance and generates a voice signal based on the acquired voice. Here, the voice of the utterance by the user may be a voice including a term for restaurant search such as “I want to eat Chinese”, or the slot 31 holds “return to the guard”. It may be a voice including a term for changing the term to be used at a past time.

  In step S102, the voice recognition unit 14 performs voice recognition processing on the voice signal generated by the microphone 13 in step S101, thereby generating utterance data of the user's utterance.

  In step S103, the utterance data acquisition unit 22 acquires the utterance data generated by the voice recognition unit 14 in step S102.

  In step S104, the sequence control unit 23 determines whether or not the utterance data acquired by the utterance data acquisition unit 22 in step S103 is empty.

  If the sequence control unit 23 determines that the utterance data is empty in step S104 (“Y” in step S104), the process proceeds to step S105. On the other hand, if it is determined that the utterance data is not empty (“N” in step S104), the process proceeds to step S121.

  In step S <b> 105, the sequence control unit 23 stores the terms included in the utterance data in the slot 31 using the operation unit 25. Specifically, the sequence control unit 23 determines the attribute of the term for each of the terms included in the utterance data, and stores the term in the slot 31 having an attribute that matches the attribute of the term. For example, the sequence control unit 23 determines that the term “Chinese” included in the utterance data “Chinese wants to eat” is a term having a dish name attribute, and the term “Chinese” is a slot having a dish name attribute. 31. At this time, when the term stored in the slot 31 is an abbreviation or common name of the original name, the sequence control unit 23 converts the original name into the original name and stores it in the slot 31. Good. Specifically, the sequence control unit 23 may determine that the term “Chinese” is an abbreviation of “Chinese cuisine” and store “Chinese cuisine” in the slot 31.

  In step S <b> 106, the operation unit 25 and the presentation control unit 29 display the terms held in the slot 31 on the display device 10.

  In step S107, the operation unit 25 or the like performs a restoration process for restoring the content of the dialogue by changing the content of the dialogue to that at the past time when necessary. Details of the restoration process will be described later in detail.

  In step S108, the analysis unit 26 determines whether or not the term is stored in all the slots 31 of the essential slot group, that is, whether or not all the slots 31 of the essential slot group hold the term.

  When the analysis unit 26 determines that the terms are stored in all the slots 31 in step S108 ("Y" in step S108), the process proceeds to step S109. On the other hand, if the analysis unit 26 determines that no term is stored in all the slots 31 (“N” in step S108), that is, if at least one slot 31 in the essential slot group is empty, the step The process proceeds to S122.

  In step S <b> 109, the sequence control unit 23 issues an execution instruction for causing the task processing unit 40 to execute task processing to the task control unit 24. At this time, the operation unit 25 records in the history table 32 that the search task has been executed. Specifically, the operation unit 25 sets “search” to the current action 323 in the history table 320.

  In step S110, the task control unit 24 outputs the term held in the slot 31 to the task processing unit 40 based on the execution instruction from the sequence control unit 23 in step S109, and performs search processing on the task processing unit 40. Let it run. The task processing unit 40 acquires the term output by the task control unit 24, performs a search process using the acquired term as a search term, and outputs a search result.

  In step S111, the presentation control unit 29 acquires the search result output by the task processing unit 40 in step S110, and presents the acquired search result to the user in the display device 10 (for example, FIG. 2). Display form) and output to the display device 10. The display device 10 acquires the search result output by the presentation control unit 29 and displays it on the display screen.

  In step S112, the task result analysis unit 28 acquires the search result output by the task processing unit 40 in step S110, and performs restoration point setting processing based on the acquired search result. Details of the restoration point setting process will be described later in detail.

  In step S <b> 113, the sequence control unit 23 gives a response instruction to prompt the user for the next utterance to the response sentence generation unit 21.

  In step S114, the response sentence generator 21 generates a response sentence based on the response instruction. In addition, the response sentence generation unit 21 outputs the generated response sentence to the speech synthesizer 12, and outputs the response sentence as a sound from the speaker 11 to allow the user to listen.

  When the process of step S114 ends, the process of step S101 is executed again.

  In step S <b> 121, the sequence control unit 23 gives a response instruction for prompting the user to re-utter (repeat the same utterance as the previous time) to the response sentence generation unit 21. The fact that the utterance data is determined to be empty in step S104 means that the voice recognition unit 14 cannot acquire the utterance data from the sound although the microphone 13 has acquired some sound. . Therefore, it is expected that utterance data can be acquired by requesting the user to perform the same utterance as the previous time.

  In step S <b> 122, the sequence control unit 23 gives a response instruction for prompting the user to speak next to the response sentence generation unit 21. For example, when there is a slot 31 that does not hold a term among the slots 31 included in the essential slot group, the sequence control unit 23 causes the user to utter the term that the slot 31 that does not hold the term should hold. A response instruction is generated to generate a response sentence.

  FIG. 5 is a flowchart of restoration processing by the voice interaction apparatus according to the present embodiment. The flowchart shown in FIG. 5 shows the details of the process of step S107 in FIG. 4, and when the utterance data includes a control term, the term held in the slot 31 is changed to that at the past time point. This shows the processing to be performed.

  More specifically, the operation unit 25 determines whether the utterance data acquired by the utterance data acquisition unit 22 includes first and second terms, which will be described later, and includes the first and second terms. If it is determined that the term held in each of the plurality of slots 31 is referred to the slot 31 associated with the attribute of the second term among the plurality of slots 31 (corresponding holding unit Corresponds to the term held in the slot 31 when the second term is held.

  In step S <b> 201, the sequence control unit 23 determines whether the utterance data acquired from the utterance data acquisition unit 22 includes a restoration term (also referred to as a first term). Here, the restoration term is a predetermined term indicating that the dialogue information is changed to a past time point, for example, “return to (to)” or “not (to)”. It is a thing.

  If the sequence control unit 23 determines in step S201 that the restoration term is included (“Y” in step S201), the process proceeds to step S202. On the other hand, if it is determined that no restoration term is included (“N” in step S201), the series of processes shown in FIG. 5 is terminated.

  In step S202, the analysis unit 26 acquires a term (also referred to as a second term) included in a portion excluding the restoration term in the utterance data, and extracts a restoration point from the history table 32 based on the obtained term. Specifically, the analysis unit 26 determines the attribute of the acquired term, and among the restoration points included in the history table 32, the term held in the slot 31 corresponding to the acquired term attribute is Extract restore points that match the terms you have selected. It can also be said that the utterance data including the first term and the second term is control utterance data. A plurality of setting points may be extracted.

  In step S203, the analysis unit 26 determines whether the number of restoration points extracted in step S202 is one.

  If the analysis unit 26 determines that there is one restoration point in step S203 ("Y" in step S203), the process proceeds to step S204. On the other hand, when the analysis unit 26 determines that there is not one restoration point (“N” in step S203), the process proceeds to step S211.

  In step S204, the operation unit 25 refers to the history table 32 and changes the term held in the slot 31 to the term held in the slot 31 at the point of the restoration point extracted in step S202. To do. That is, the operation unit 25 changes the terminology held in the plurality of slots 31 so as to return to the term at the time of the restoration point. In addition, the operation unit 25 sets “restore” as the action when the history table 320 changes to the term at the time of the restoration point. Note that the operation unit 25 does not have a term held in the slot 31 at the time of the restoration point, that is, if the slot 31 holds no term at the time of the restoration point, the slot 31 Terminate the term.

  In step S <b> 211, the sequence control unit 23 issues a response instruction to the response sentence generation unit 21 regarding a response for prompting the user to extract only one restoration point. For example, in the history table 320, when a control utterance such as “return to the guard” is acquired from the user, there may be two restoration points specified from the control utterance. In order to urge the user to indicate which of the two restoration points is intended, the sequence control unit 23 responds with a response “Would it return to the place searched with the parking lot?” Give instructions.

  After step S211, when the user makes an utterance that specifies one of the two restoration points, one restoration point is extracted in step S202 executed from the next main process (FIG. 4). Step S204 is executed.

  In the above, instead of the second term, an attribute name that is an attribute name may be used. That is, the operation unit 25 determines whether or not the first term and the attribute name are included in the utterance data acquired by the utterance data acquisition unit 22, and when it is determined that the first term and the attribute name are included, Referring to the table, the terms held by each of the plurality of slots 31 are currently held by the slot 31 (corresponding to the correspondence holding unit) associated with the attribute indicated by the attribute name among the plurality of slots 31. The term may be changed to the term held in the slot 31 immediately before the term is held.

  FIG. 6 is a flowchart of restoration point setting processing by the voice interaction apparatus according to the present embodiment. The flowchart shown in FIG. 6 shows details of the process in step S112 in FIG.

  In step S301, the operation unit 25 branches the process based on a condition for setting a restoration point. When the above condition is “when search is executed” (condition C) (“condition C” in step S301), the process proceeds to step S302. On the other hand, when the above condition is ““ time when search is performed ”and“ search result is valid ”” (condition D) (“condition D” in step S301), the process proceeds to step S303. Here, the case where there are two conditions is shown as an example, but the same processing is possible even when there are three or more conditions.

  In step S <b> 302, the operation unit 25 sets a restoration point at the current time point in the history table 320.

  In step S303, the operation unit 25 acquires a search result that is an analysis result of the task result analysis unit 28, and determines whether or not the number of pieces of searched information is zero.

  When the number of information retrieved in step S303 is zero (“Y” in step S303), the operation unit 25 ends a series of processes without setting a restoration point at this point. That is, the operation unit 25 prohibits setting a restoration point when the information included in the information search result is 0 even when the information search result is acquired. On the other hand, when the number of retrieved information is not 0 (“N” in step S303), the process proceeds to step S302.

  Even when the number of retrieved information is not suitable for browsing by the user (for example, 100 or more), the restoration point may not be set at this time as in the case of zero.

  FIG. 7 is a second explanatory diagram of history information according to the present embodiment. The dialogue sequence shown in FIG. 7 is a dialogue in which a user sequentially searches a restaurant under different search conditions while changing the search conditions. In this case, the contents of the dialogue are changed to those at the past time when they are different.

  FIG. 7 shows a dialogue sequence 310 and the like as in FIG.

  At the time corresponding to the records R1 to R5, the terms included in the user's utterance are sequentially acquired by the utterance data acquisition unit 22 and the like, and each of the acquired terms is stored in the slot 31 corresponding to the attribute of the term. .

  At the time corresponding to the record R6, the task processing unit 40 performs the first search process based on the term held in the slot 31. This is performed when the term is stored in all the slots 31 included in the essential slot group at the time corresponding to the record R5.

  At a time corresponding to the records R7 to R14, a search process based on the terms stored in the slot 31 is performed. In this case, the search processing is sequentially performed while changing the search word so that the search result desired by the user can be obtained.

  In this dialogue, the term held in the slot 31 is changed to a different one from the user's intention due to erroneous recognition by the voice recognition unit 14. Specifically, at the time corresponding to the record R11, the user uttered “parking lot (Chushajomo)” with the intention of adding a parking lot as a search condition, but the voice recognition unit 14 “Chinese cuisine (Chukaryori) And the term “Chinese cuisine” is stored in the slot 31 of the attribute of the dish name in the record R12. In addition, at the time corresponding to the record R13, the user uttered “Chuka-janakute-itaria” instead of “Chuka-janakute-itaria” with the intention of correcting the search condition. That is, the place name is erroneously recognized as Iriya, and the term “Iriya” is stored in the slot 31 of the regional attribute at the time corresponding to the record R15.

  At the time corresponding to the record R15, the user makes an utterance for returning the content of the dialogue to the past time. This is because the term held in the slot 31 at the time corresponding to the record R12 or R14 has been changed unlike the user's intention, and the user tries to return to the search condition at the past time before the change was made. Is intended.

  At the time corresponding to the records R15 to R16, the terms held in the slots 31 are restored to those in the record R10.

  In this way, the voice interaction device can return the content of the interaction to a past time point based on the utterance by the user, and continuously execute a new interaction from that state. In this way, the voice interaction device can correct the content of the dialogue with the user by a simple method.

[1-3. Modified example]
FIG. 8 is a block diagram showing a configuration of a voice interactive apparatus 20A according to a modification of the present embodiment.

  As shown in FIG. 8, the voice interaction device 20A is a voice interaction device 20A that performs a dialogue with a user by voice, and includes a plurality of holding units 103 for holding dialogue information indicating the contents of the dialogue. Each of the plurality of holding units 103 is associated with a term attribute, and each of the plurality of holding units 103 holds a term having an attribute associated with the holding unit 103, and a plurality of holding units 103 A storage unit 104 that stores a history of terms to be held, and utterance data indicating the content of utterances by the user's voice are acquired. When the acquisition unit 101 acquires control unit utterance data including a control term for controlling dialogue information and the acquisition unit 101 stored in the storage unit 103 associated with the attribute of A change unit 102 that refers to the memory unit 104 and changes a term held by each of the plurality of holding units 103 to a term held by the holding unit 103 at a past time specified by the control term; Is provided.

  The voice interaction device 20A further outputs the interaction information to a processing unit that performs processing based on the interaction information, using the terms held by each of the plurality of storage units 103 as interaction information, and processes the response as an output response. An external processing control unit 105 that acquires information indicating the result of the above may be provided.

  The processing unit executes an information search using the acquired term as a search term, the external processing control unit 105 acquires a result of the information search as a response, and the voice interaction apparatus 20A further includes the external processing control unit 105. You may provide the presentation control part 106 for showing the acquired information search result to a user.

  FIG. 9 is a flowchart showing a control method of the voice interactive apparatus 20A according to a modification of the present embodiment.

  As shown in FIG. 9, the control method of the voice interaction device 20A that performs voice dialogue with the user acquires utterance data indicating the content of the utterance by the user's voice (step S401), and is included in the acquired utterance data. Of the plurality of holding units 103 is held in the holding unit 103 that is associated with the attribute of the utterance term (step S402), and the utterance data acquired in the acquiring step is used to control the conversation information. When the control term is included, the term held by each of the plurality of holding units 103 is referred to the history stored in the storage unit 104 and the term held in the past specified by the control term is held. A change step (step S403).

  The voice interaction device 20A according to this modification has the same effects as the voice interaction device 20.

[1-4. Effect]
As described above, the voice interaction device 20 according to the present embodiment is a voice interaction device 20 that performs a voice dialogue with a user, and includes a plurality of slots 31 for holding dialogue information indicating the content of the dialogue. Each of the plurality of slots 31 is associated with a term attribute, and each of the plurality of slots 31 for holding a term having an attribute associated with the slot 31 includes a plurality of slots 31 A history table 32 that stores the history of terms to be held, and utterance data indicating the contents of utterances by the user's voice are acquired, and the utterance terms included in the acquired utterance data are converted into the utterance terms of the plurality of slots 31. An utterance data acquisition unit 22 to be held in a slot associated with an attribute, and utterance data acquired by the utterance data acquisition unit 22 are used for controlling dialogue information. If the term is included, the history stored in the history table 32 is referred to, and the term held in each of the plurality of slots 31 is changed to the slot 31 at the past time point specified by the control term. And an operation unit 25 for changing to the retained term.

  According to this, the voice interaction device 20 can change the conversation information to that at the past time point based on the user's voice, that is, the conversation information can be returned to the past state. Here, the past time point is a time point determined by the user's voice. Therefore, the user can return the conversation information, which is the content of the conversation with the voice interaction apparatus 20, to the one at the past time point by uttering by voice including the control terms for specifying the past time point. . Thus, the voice interaction device 20 can correct the content of the dialogue with the user by a simple method.

  In particular, the voice dialogue apparatus 20 is characterized in that the content of the dialogue with the user is corrected by a simple method by performing control based on the voice of the user. Since it is difficult for the user to grasp the content of the dialogue in time series in the voice dialogue with the conventional voice dialogue apparatus, it is difficult to perform an operation of returning the content of the dialogue to a past time point desired by the user. Since the voice interaction device 20 according to the present embodiment performs control based on the user's voice, the content of the dialogue can be returned to a past time point desired by the user. And it is thought that the superiority of the control based on the user's voice increases as the content of the dialogue becomes more complicated, that is, the number of terms increases.

  In addition, when the conversation information becomes more complicated as the technology evolves, for example, when there are several tens or more holding units, the above-described correction method is highly advantageous. Because, in the case of a voice dialogue apparatus having less than ten holding units as shown in the present embodiment, the term held by the holding unit instead of returning the content of the dialogue with the user to a past time point It is practically possible to reset and reset the terminology from the beginning. However, in the case where the voice interactive apparatus includes several tens or more holding units, it is complicated to reset the terms held by the holding unit from the beginning, which is a heavy burden on the user. It is hard to say that it is possible. In such a case, since the voice interaction device 20 can return the content of the dialog with the user to a past time, it is possible to restart the dialog from a past time desired by the user without resetting from the beginning. There are advantages you can do.

  The control terms include a first term that is a predetermined term indicating that the dialogue information is changed to a past time point, and a second term that is different from the predetermined character string. The speech data acquired by the speech data acquisition unit 22 determines whether or not the first term and the second term are included, and if it is determined that the first term and the second term are included, refer to the history. The term held by each of the plurality of slots 31 is retained by the slot 31 when the slot 31 associated with the attribute of the second term among the plurality of slots 31 retains the second term. You may change the terminology.

  According to this, based on the control term acquired by the acquisition unit, the voice interaction device 20 specifically specifies a past time point using the content of the term held by the holding unit. Thus, the voice interaction device 20 can correct the content of the dialogue with the user by a more specific method.

  In addition, when the state of the plurality of slots 31 at a certain point in the history stored in the history table 32 satisfies a predetermined condition, the operation unit 25 sets a restoration point at the above point, When changing the term that each holds, the slot 31 associated with the attribute of the second term among the plurality of slots 31 at the time when the restoration point is set holds the second term. The term may be changed to the term held in the slot 31 at that time.

  According to this, the voice interaction device 20 sets a restoration point at a time point based on the user's voice, thereby narrowing down a time point for which a term held by the holding unit is changed later using a predetermined condition. I can leave. Thereby, when changing the term which a holding | maintenance part hold | maintains, the voice interactive apparatus 20 can return the state of a dialog to the more suitable past time point narrowed down by predetermined conditions.

  Further, the voice interaction device 20 further outputs the terms held in each of the plurality of slots 31 as interaction information to the task processing unit 40 that performs processing based on the interaction information, and the processing as a response to the output A task control unit 24 that acquires information indicating the result of the above may be provided.

  According to this, the voice interaction apparatus 20 presents the result of processing the terms held by the plurality of holding units by the external processing unit to the user. Therefore, the user can acquire the processing result reflecting the content of the dialogue with the voice dialogue apparatus 20.

  In addition, the task processing unit 40 performs an information search using the acquired term as a search term, the task control unit 24 acquires a result of the information search as a response, and the voice interaction device 20 further includes an external processing control unit. You may provide the presentation control part 29 for showing the acquired result of the said information search to the said user.

  According to this, the speech dialogue apparatus 20 can acquire the result of the search process based on the content of the dialogue as a result of the processing by the external processing unit and present it to the user.

  Further, the operation unit 25 may set a restoration point at the time when the task control unit 24 acquires the information search result in the history.

  According to this, the voice interaction apparatus 20 can return the term held by the holding unit to that at the time when the information search is performed using the restoration point. The time when the information search is performed is also the time when the result is obtained, and is the time when the user can easily specify in the dialogue. By setting the restoration point in this way, the voice interaction apparatus 20 can return the term held by the holding unit to the one at the time when the user can easily specify intuitively.

  In addition, the operation unit 25 sets a restore point when the information included in the information search result is 0 even when the task control unit 24 acquires the information search result in the history. Doing so may be prohibited.

  According to this, the voice interactive apparatus 20 can exclude the time when the result of the information search is 0 from the time when the restoration point is set. When the user wants to return the dialog state, it is considered useful to set the time when there are one or more information search results. Therefore, the voice interaction device 20 can return the content of the dialog with the user to a time useful for the user.

  In addition, when there are two or more restoration points on the history when the terms held by each of the plurality of slots 31 are changed, the operation unit 25 is specified by the user among the two or more restoration points. You may change the terminology using a restore point.

  According to this, the voice interactive apparatus 20 can return the content of the dialog with the user to the one at the past time by using one restoration point specified by the user among a plurality of restoration points.

  Moreover, the voice interactive apparatus 20 may further include a response sentence generation unit 21 that generates a response sentence for accepting from the user one restoration point used to change a term among two or more restoration points.

  According to this, the voice interactive apparatus 20 causes the user to specify one restoration point from among a plurality of restoration points. As a result, the voice interaction device 20 can specifically accept the designation of the restoration point from the user, and return the content of the dialogue with the user to that at the past time.

  The control term includes a first term that is a predetermined term indicating that the dialogue information is changed to a past time point, and an attribute name that is a name of the attribute. The operation unit 25 includes an utterance data acquisition unit. 22 determines whether the first term and the attribute name are included in the utterance data acquired, and if it is determined that the first term and the attribute name are included, each of the plurality of slots 31 is referred to with reference to the history. The term held in the slot 31 immediately before holding the term currently held in the slot 31 associated with the attribute indicated by the attribute name among the plurality of slots 31 You may change to

  According to this, based on the control term acquired by the acquisition unit, the voice interaction device 20 specifically specifies a past time point using the name of the attribute with which the holding unit is associated. Thus, the voice interaction device 20 can correct the content of the dialogue with the user by a more specific method.

  Further, the voice interaction system 1 according to the present embodiment is a voice interaction system 1 that performs a dialogue with a user by voice, and includes a plurality of slots 31 for holding dialogue information indicating the content of the dialogue, Each of the plurality of slots 31 is associated with a term attribute, each of which has a term having an attribute associated with the slot 31, and a term held by the plurality of slots 31 The history table 32 storing the history of the utterance and the utterance data indicating the content of the utterance by the user's voice are acquired, and the utterance term included in the acquired utterance data is associated with the attribute of the utterance term among the plurality of slots 31. The utterance data acquisition unit 22 to be held in the attached slot 31 and the utterance data acquired by the utterance data acquisition unit 22 are used for controlling dialogue information. If the term is included, the history stored in the history table 32 is referred to, and the term held in each of the plurality of slots 31 is changed to the slot 31 at the past time point specified by the control term. The utterance data acquisition is performed by performing the voice recognition process on the voice signal generated by the operation unit 25 that changes to the retained term, the microphone 13 that acquires the user's voice and generates the voice signal, and the microphone 13. The speech recognition unit 14 that generates the utterance data acquired by the unit 22 and the conversation information held by the plurality of slots 31 are acquired, a predetermined process is performed on the acquired dialog information, and the processing result is shown. A task processing unit 40 that outputs information, and a sound that generates a speech signal by generating a response sentence to an utterance by a user's voice and performing a speech synthesis process on the generated response sentence It comprises a combining unit 12, and a speaker for outputting audio signals the speech synthesis unit 12 has generated as a voice, and a display device 10 for displaying the result of processing the task processing unit 40 is outputted.

  Thereby, there exists an effect similar to the said voice interactive apparatus 20. FIG.

  The voice interaction method according to the present embodiment is a control method of the voice interaction device 20 that performs a voice interaction with a user, and the voice interaction device 20 holds dialogue information indicating the content of the dialogue. A plurality of slots 31, each of the plurality of slots 31 being associated with a term attribute, each of which has a term having an attribute associated with the slot 31; A history table 32 storing a history of terms held by a plurality of slots 31, and the control method acquires utterance data indicating the content of the utterance by the user's voice, and the utterance terms included in the acquired utterance data Is acquired in the slot 31 associated with the attribute of the utterance term among the plurality of slots 31, and the utterance data acquired in the acquisition step is When a control term for controlling the talk information is included, the history stored in the history table 32 is referred to, and the term held in each of the plurality of slots 31 is identified by the control term. And a change step for changing to the term held in the slot 31 at the time of.

  Thereby, there exists an effect similar to the said voice interactive apparatus 20. FIG.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above implementation. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present disclosure is useful as a speech dialogue apparatus that can correct the content of dialogue with a user by a simple method. For example, the present disclosure can be applied to an application of a car navigation device, a smartphone (high-function mobile phone terminal), a mobile phone terminal, or a PC (Personal Computer).

DESCRIPTION OF SYMBOLS 1 Voice dialogue system 10 Display apparatus 11 Speaker 12 Voice synthesizer 13 Microphone 14 Voice recognition part 20, 20A Voice dialogue apparatus 21 Response sentence generation part 22 Utterance data acquisition part 23 Sequence control part 24 Task control part 25 Operation part 26 Analysis part 27 Memory 28 Task result analysis unit 29, 106 Presentation control unit 31 Slot 32, 320 History table 40 Task processing unit 101 Acquisition unit 102 Change unit 103 Holding unit 104 Storage unit 105 External processing control unit 310 Dialog sequence 311 Time information 312 Utterance 313 Response 321 Required slot group 322 Optional slot group 323 Action 324 Restore point 330 Search result

Claims (12)

A voice dialogue device that performs voice dialogue with a user,
A plurality of holding units for holding dialogue information indicating the content of the dialogue, wherein each of the plurality of holding units is associated with a term attribute, and each of the plurality of holding units has an attribute associated with the holding unit. A plurality of holding portions for holding the terms having;
A storage unit storing a history of terms held by the plurality of holding units;
Acquisition of utterance data indicating the content of utterances by the user's voice, and acquisition of utterance terms included in the acquired utterance data in a holding unit associated with the attribute of the utterance term among the plurality of holding units And
When the utterance data acquired by the acquisition unit includes a control term for controlling the conversation information, each of the plurality of holding units is referred to with reference to the history stored in the storage unit A voice interaction device comprising: a changing unit that changes a held term to a term held by the holding unit at a past time point specified by the control term. The control term is:
Including a first term that is a predetermined term indicating that the dialogue information is changed to a past time point, and a second term that is different from the predetermined character string,
The changing unit is
It is determined whether or not the first term and the second term are included in the utterance data acquired by the acquisition unit, and the history is determined when it is determined that the first term and the second term are included. Referring to the term held by each of the plurality of holding units, the corresponding holding unit associated with the attribute of the second term among the plurality of holding units holds the second term. The spoken dialogue apparatus according to claim 1, wherein the term is changed to a term held by the holding unit at the time. The changing unit is
When the state of a plurality of holding units at a certain point on the history stored in the storage unit satisfies a predetermined condition, a restoration point is set at the point in time,
When changing the term held by each of the plurality of holding units, the holding associated with the attribute of the second term among the plurality of holding units at the time when the restoration point is set The spoken dialogue apparatus according to claim 2, wherein when the unit holds the second term, the term is changed to the term held by the holding unit. The voice interaction device further includes:
An external that outputs the terminology held by each of the plurality of holding units as the dialogue information to a processing unit that performs processing based on the dialogue information, and acquires information indicating the result of the processing as a response to the output The voice interactive apparatus according to claim 3, further comprising a processing control unit. The processing unit performs an information search using the acquired term as a search term,
The external processing control unit acquires the result of the information search as the response,
The voice interaction device further includes:
The voice interactive apparatus according to claim 4, further comprising a presentation control unit for presenting the result of the information search acquired by the external processing control unit to the user. The voice interactive apparatus according to claim 5, wherein the changing unit sets the restoration point at the time when the external processing control unit acquires the information search result in the history. In the history, the changing unit is configured to restore the restoration when the information included in the information search result is 0 even when the external processing control unit acquires the information search result. The voice interactive apparatus according to claim 6, wherein setting of points is prohibited. The change unit may change the term held by each of the plurality of holding units, and if there are two or more restoration points on the history, the user among the two or more restoration points. The spoken dialogue apparatus according to claim 3, wherein the term is changed by using a restoration point specified by The voice interaction device further includes:
The voice dialogue apparatus according to claim 8, further comprising: a response sentence generation unit that generates a response sentence for accepting, from a user, one restoration point used to change the term among the two or more restoration points. The control term is:
Including a first term that is a predetermined term indicating that the dialogue information is changed to a past time point, and an attribute name that is a name of the attribute,
The changing unit is
It is determined whether the first term and the attribute name are included in the utterance data acquired by the acquisition unit, and when it is determined that the first term and the attribute name are included, the history is referred to. The term held by each of the plurality of holding units is immediately before holding the term currently held by the correspondence holding unit associated with the attribute indicated by the attribute name among the plurality of holding units. The spoken dialogue apparatus according to claim 1, wherein the term is changed to a term held by the holding unit at the point of time. A voice dialogue system that performs voice dialogue with a user,
A plurality of holding units for holding dialogue information indicating the content of the dialogue, wherein each of the plurality of holding units is associated with a term attribute, and each of the plurality of holding units has an attribute associated with the holding unit. A plurality of holding portions for holding the terms having;
A storage unit storing a history of terms held by the plurality of holding units;
Acquisition of utterance data indicating the content of utterances by the user's voice, and acquisition of utterance terms included in the acquired utterance data in a holding unit associated with the attribute of the utterance term among the plurality of holding units And
When the utterance data acquired by the acquisition unit includes a control term for controlling the conversation information, each of the plurality of holding units is referred to with reference to the history stored in the storage unit A changing unit that changes the holding term to a term held by the holding unit at a past time specified by the control term;
A microphone that captures the user's voice and generates a voice signal;
A voice recognition unit that generates the utterance data acquired by the acquisition unit by performing a voice recognition process on the voice signal generated by the microphone;
A processing unit that acquires the dialogue information held by the plurality of holding units, performs predetermined processing on the acquired dialogue information, and outputs information indicating a result of the processing;
A speech synthesizer that generates a response signal to an utterance by the user's voice and generates a speech signal by performing speech synthesis processing on the generated response statement;
A speaker that outputs the voice signal generated by the voice synthesizer as voice;
A voice dialogue system comprising: a display device that displays a result of the processing output by the processing unit. A method for controlling a voice dialogue apparatus that performs voice dialogue with a user,
The voice interaction device
A plurality of holding units for holding dialogue information indicating the content of the dialogue, wherein each of the plurality of holding units is associated with a term attribute, and each of the plurality of holding units has an attribute associated with the holding unit. A plurality of holding portions for holding the terms having;
A storage unit storing a history of terms held by the plurality of holding units,
The control method is:
Acquisition of utterance data indicating the content of utterances by the user's voice, and acquisition of utterance terms included in the acquired utterance data in a holding unit associated with the attribute of the utterance term among the plurality of holding units Steps,
When the utterance data acquired in the acquisition step includes a control term for controlling the conversation information, each of the plurality of holding units is referred to with reference to the history stored in the storage unit A change step of changing the held term to a term held by the holding unit at a past time specified by the control term.

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