JP2005354352A - Communication terminal apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive communication terminal apparatus capable of adding crime prevention functions using a simple configuration, as to the communication terminal apparatus provided with a modem. <P>SOLUTION: The communication terminal apparatus 1 provided with a modem 15 for performing modulation for converting a digital signal into an analog signal, to be transmitted via a public telephone line 17 and demodulation for converting the analog signal received through the public telephone line 17 into the digital signal is provided with: a sound collector 16 for collecting sound signals in a room and outputting the collected sound signals to a prescribed output destination; a deciding means 2 for deciding whether the digital signal converted by the modem 15 is an abnormal sound, when the sound signal, collected by the sound collector 16, is outputted to the modem 15; and notification means 2, 15 for notifying a prescribed external communication terminal A of abnormality generation, when the deciding means 2 decides that the digital signal is an abnormal sound. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication terminal apparatus, and more particularly to a communication terminal apparatus provided with a modem that modulates or demodulates transmission / reception data.

  A communication terminal device such as a facsimile apparatus includes a network control unit (NCU) that closes and opens a telephone line (PSTN: Public Switched Telephone Network), a modem that modulates and demodulates image data, and the like. The image data is transmitted / received by facsimile to / from an external device via the PSTN. In recent years, it has been considered to use a communication terminal device provided with a communication means with an external device as a crime prevention device in this way, for example, a crime prevention function that detects an abnormality in a room and notifies the external device of the fact. Has been proposed (see, for example, Patent Document 1).

The communication terminal device of Patent Document 1 includes an ultrasonic sensor for detecting the presence or absence of an intruder or the like in a communication terminal device having a facsimile transmission / reception function, and an abnormality detection circuit that determines the presence or absence of an abnormality based on the detection result of the ultrasonic sensor. Etc. are added. In this communication terminal device, when the abnormality detection circuit determines that there is an abnormality based on the detection result of the ultrasonic sensor, a document informing that a preset external facsimile device has an abnormality is written. By transmitting the image data by facsimile, the external device is notified of the abnormality.
JP-A-6-33496

  However, the communication terminal device of Patent Document 1 needs to add an expensive device such as an ultrasonic sensor and an abnormality detection circuit, and there is a problem that it is expensive to realize a crime prevention function. Moreover, since an ultrasonic sensor and an abnormality detection circuit must be incorporated, the configuration becomes complicated.

  The present invention has been made in view of the above-described problems, and provides a communication terminal device that can add a crime prevention function with a simple structure at a low cost in a communication terminal device equipped with a modem. The purpose is to do.

  In order to achieve the above object, a communication terminal apparatus according to claim 1, wherein a digital signal is converted into an analog signal for transmitting a digital signal through a public telephone line and an analog signal received through the public telephone line is converted into a digital signal. A communication terminal device having a modem for demodulation to be converted into a call detecting means for detecting a call signal from a public telephone line, and a switching means for switching connection between the public telephone line and the modem or the call detecting means Communication means for performing communication in a state where the public telephone line and the modem are connected by the means, a sound collector for collecting a sound signal in a room and outputting it to a predetermined output destination, and the sound collector When a sound signal collected by the modem is output to the modem, a determination means for determining whether or not the digital sound signal converted by the modem is an abnormal sound; If the signal is determined to be abnormal sound lies in comprising a notifying means for notifying an abnormality occurrence to a predetermined external communication terminal.

  The communication terminal device according to claim 2 is the communication terminal device according to claim 1, further comprising storage means for storing the abnormal sound pattern, wherein the determination means stores the abnormal sound stored in the storage means. It is to determine whether or not the digital audio signal is an abnormal sound based on a pattern.

  The communication terminal device according to claim 3 is the communication terminal device according to claim 1 or 2, wherein the sound collector and the modem are connected or disconnected, and either the security mode or the normal mode. Receiving means for accepting the designation, and setting means for setting either the crime prevention mode or the normal mode based on the designation accepted by the means, and the crime prevention mode is set by the setting means. In this case, the connection blocking means connects the sound collector and the modem, and the sound collector outputs the collected sound signal to the modem and is set to the normal mode by the setting means. The connection disconnecting means is configured to disconnect the connection between the sound collector and the modem.

  The communication terminal device according to claim 4 is the communication terminal device according to any one of claims 1 to 3, wherein the abnormal sound continues when the determination unit determines that the digital audio signal is abnormal sound. Measuring means for measuring a time to perform, and the notification means notifies the predetermined external communication terminal of the occurrence of an abnormality when the time measured by the measuring means exceeds a predetermined time.

  The communication terminal device according to claim 5 is the communication terminal device according to any one of claims 1 to 4, wherein the notification means notifies the predetermined external communication terminal of an abnormality through a public telephone line. There is to do.

  The communication terminal device according to claim 6 is the communication terminal device according to any one of claims 1 to 5, wherein the notifying unit notifies the predetermined external communication terminal of the occurrence of the abnormality and the sound collecting device. The sound signal collected by the device is to be transmitted.

  According to a seventh aspect of the present invention, in the communication terminal device according to any one of the first to fifth aspects, when the determination unit determines that the digital audio signal is an abnormal sound, the communication terminal device includes: The image capturing apparatus includes an acquisition unit that captures and acquires indoor image data, and the notification unit notifies the occurrence of the abnormality to the predetermined external communication terminal and transmits the indoor image data acquired by the acquisition unit. There is to do.

  According to the communication terminal device of the first aspect, the crime prevention function can be realized only by adding the sound collector by using the existing modem for the communication terminal device to capture the audio signal in the room. Therefore, a crime prevention function can be added to the communication terminal device with a low cost and simple configuration.

  According to the communication terminal device of the second aspect, since it is determined whether or not the indoor audio signal is abnormal sound based on the abnormal sound pattern, erroneous detection of abnormal sound can be prevented. Further, for example, by storing a crime prevention buzzer pattern in advance as an abnormal sound pattern, a crime prevention function can be realized in combination with the crime prevention buzzer.

  According to the communication terminal device of the third aspect, the user can designate either the security mode or the normal mode. For example, when there is a person in the room such as in the daytime, the normal mode is designated. It is possible to prevent erroneous detection of abnormal sound by the communication terminal device.

  According to the communication terminal device of the fourth aspect, the abnormal communication is not notified to the external communication terminal unless the abnormal sound continues for a predetermined time, so the abnormal communication is erroneously detected and the external communication terminal is notified of the abnormality. This can be prevented.

  According to the communication terminal device of the fifth aspect, the occurrence of abnormality can be easily notified to the external communication terminal via the public telephone line.

  According to the communication terminal device of the sixth aspect, the user listens to the sound in the room where the communication terminal device is installed by using the external communication terminal to determine what kind of abnormality has occurred in the room. There is an advantage that it is easy to recognize.

  According to the communication terminal device of the seventh aspect, the user can see what abnormality is occurring in the room by viewing the image of the room in which the communication terminal device is installed using the external communication terminal. There is an advantage that it is easy to recognize.

  Hereinafter, a communication terminal device 1 according to an embodiment of the present invention will be described with reference to the drawings. As illustrated in FIG. 1, the communication terminal device 1 includes a control unit (MPU: Microprocessing Unit) 2, a ROM (Read Only Memory) 3, a document reading unit 4, a codec 5, an image memory 6, a recording unit 7, and an operation unit. 8, a display unit 9, a communication unit 10, a RAM (Random Access Memory) 11, and a LAN I / F (Local Area Network Interface) 12, and the units 2 to 12 are communicably connected by a bus 13. Has been.

  The control unit 2 controls each unit constituting the communication terminal device 1 in accordance with a control program stored in the ROM 3, and the control program in the ROM 3 can be rewritten from the outside. The document reading unit 4 reads an image of a document and outputs image data. Although not shown, an image sensor such as a CCD (Charge Coupled Device), an optical system such as a light source, a flat bed scanner (FBS). ) And an automatic document feeder (ADF: Automatic Document Feeder).

  The codec 5 encodes and decodes image data for facsimile transmission / reception and the like. That is, image data read by the document reading unit 4 is converted into JPEG (Joint Photographic Experts Group), MH (Modified Huffman), MR (Modified Read), MMR (Modified Modified Read), JBIG (Joint Bi-level Image Group) methods. Etc., and the encoded image data is decoded. In addition, image data is encoded and decoded in correspondence with a TIFF (Tagged Image File Format) format and a PDF (Portable Document Format) format which are image formats generally used in computers. The image memory 6 stores image data directly output from the document reading unit 4, image data encoded by the codec 5, and image data transmitted or received by facsimile.

  The recording unit 7 records images such as image data read by the document reading unit 4 and image data transmitted / received by facsimile on a sheet. As a recording method in the recording unit 7, for example, an electrophotographic method can be used. Although not shown, the operation unit 8 specifies a start key for instructing the document reading unit 4 to start reading a document, a numeric keypad for inputting a facsimile number, the number of copies, and the like, and a destination registered in advance on the one-touch dial. Various operation keys linked to the display unit 9 such as a one-touch key and a cursor key for performing various settings. In addition, the operation unit 8 functions as a reception unit that receives designation of either the security mode or the normal mode. The designation of either the crime prevention mode or the normal mode by the user is not limited to the operation from the operation unit 8. For example, when a user inputs a predetermined command from an external communication terminal connected to the communication terminal device 1 via a PSTN (to be described later) or a PC on a LAN (to be described later), the user can designate either the normal mode or the security mode. It is also possible to do this. The display unit 9 includes a liquid crystal display (LCD) that displays various setting states, operation states of the communication terminal device 1, and the like with characters and graphics. The display unit 9 may be an LCD with a touch panel that also has the operation function of the operation unit 8.

  The communication unit 10 includes an NCU (Network Control Unit) 14 and a modem 15. The NCU 14 is a line network control device that controls a telephone line to make or cut a call, and is connected to a PSTN (Public Switched Telephone Network) 17. The NCU 14 is connected to a sound collector 16 that collects indoor audio signals. Note that an external communication terminal A is connected to the PSTN 17. The modem 15 is, for example, a recommendation V.16 of ITU-T (International Telecommunication Union Telecommunication Standardization Sector). Modulation and demodulation of transmission / reception data according to the 34 standard or the like, that is, modulation for converting a digital signal to an analog signal for transmission via PSTN 17, and analog signal received via PSTN 17 as a digital signal A fax modem that performs demodulation and conversion to The modem 15 converts (modulates) digital document image data into an audio band analog signal during facsimile transmission, and converts a facsimile received voice band analog signal into digital document image data during facsimile reception. Demodulate). The modem 15 converts the analog audio signal output from the sound collector 16 via the NCU 14 into a digital audio signal using the modulation function. The modem 15 is not limited to the fax modem described above, and may be an ADSL (Asymmetric Digital Subscriber Line) modem or a data modem.

  The RAM 11 functions as a main memory, work area, and the like for the control unit 2. Moreover, it functions as a setting means for setting either the crime prevention mode or the normal mode based on an input from the operation unit 8 or the like by the user. The normal mode is a mode for executing a copy function for reading image data of a document and recording the image on a sheet, and a function for transmitting / receiving a document image data to / from an external device by facsimile. In this mode, the presence or absence of an abnormality is determined by collecting the audio signal, and when it is determined that there is an abnormality, the occurrence of the abnormality is notified to a predetermined external communication terminal. Note that the setting of either the normal mode or the security mode is switched by an input from the operation unit 8 or the like by the user, but the normal mode or the security mode can be switched according to time. For example, it is possible to set to switch to the crime prevention mode after 3 hours from the normal mode, or to set the crime prevention mode from 10 o'clock in the evening to 8 o'clock in the morning by operating from the operation unit 8 It is.

  The LAN I / F 12 is an interface that connects a LAN (Local Area Network) 18 and the communication terminal device 1 in a communicable manner. A client PC 19 is installed in the LAN 18 so that various functions of the communication terminal device 1 can be used from the client PC 19. The LAN 18 is also provided with a mail server 20 and a router 21, and the communication terminal device 1 transmits or receives an e-mail with document data attached to another Internet facsimile machine (not shown) via the Internet or the like. Internet facsimile communication can be performed. Further, the LAN 18 is provided with an image capturing device B that captures indoor image data. The control unit 2 functions as an acquisition unit that causes the image capturing apparatus B to capture indoor image data and acquire the image data. Specifically, the control unit 2 transmits a predetermined command to the image capturing device B, captures image data in the room, and acquires the image data. That is, the image capturing device B receives a predetermined command transmitted by the control unit 2 of the communication terminal device 1, captures indoor image data, and transmits the captured image data to the communication terminal device 1 via the LAN 18. Forward to.

  When the normal mode is set, the communication terminal apparatus 1 having the above configuration reads a document image data and records the image on a sheet, or the document image data with an external device. If the crime prevention mode is set, the sound signal in the room is collected to determine whether there is an abnormality, and if there is an abnormality, the external communication terminal A is informed. Executes the function to notify the occurrence of an abnormality. Hereinafter, the configuration of the NCU 14 and the operations of the NCU 14 and the modem 15 in the normal mode and the security mode will be described with reference to FIG.

  The NCU 14 includes a transformer 22, a transmission amplifier 23, a reception amplifier 24, a first switch 25, a second switch 26, a third switch 27, and a call detection device 28, and the modem 15 and the sound collector 16 are connected to the NCU 14. It is connected. The NCU 14 is connected to the PSTN 17 via the third switch 27. The transformer 22 is for insulating or connecting internal circuits between the PSTN 17 and the communication terminal device 1. The transmission amplifier 23 and the reception amplifier 24 amplify image data to be transmitted / received by facsimile and an audio signal collected by the sound collector 16. The first switch 25 switches between a state in which the sound collector 16 and the third switch 27 are connected and a state in which the sound collector 16 and the second switch 26 are connected. The second switch 26 switches between a state in which the first switch 25 and the third switch 27 are connected and a state in which the modem 15 and the third switch 27 are connected. The third switch 27 switches between a state in which the PSTN 17 and the modem 15, the first switch 25, and the second switch 26 are connected, and a state in which the PSTN 17 and the call detection device 28 are connected. The first switch 25 and the second switch 26 function as connection blocking means for connecting the sound collector 16 and the modem 15 or blocking the connection. The second switch 26 and the third switch 27 are connected to the PSTN 17 and the modem. 15 or a switching means for switching the connection with the call detection device (call detection means) 25. The call detection device 28 functions as a call detection unit that detects a call signal from the PSTN 17, and outputs the detected call signal to the control unit 2.

  First, operations of the NCU 14 and the modem 15 in the normal mode will be described. When waiting for facsimile transmission / reception of image data, the first switch 25, the second switch 26, and the third switch 27 of the NCU 14 are all switched to the b side, and the PSTN 17 and the call detection device 28 are switched by the third switch 27. Is connected, and the call detection device 28 detects a call signal from the PSTN 17. In this case, the connection between the sound collector 16 and the modem 15 is interrupted by the first switch 25 and the second switch 26, and the audio signal collected by the sound collector 16 is not output to the modem 15.

  When a call signal is detected and image data is received by facsimile, the third switch 27 of the NCU 14 is switched from the b side to the a side, and the modem 15 and the PSTN 17 are connected by the second switch 26 and the third switch 27. . The modem 15 performs a predetermined sequence such as detection of a calling tone (CNG: Calling Tone) transmitted by an external facsimile apparatus and transmission of a called terminal identification signal (CED: Called Station Identification) to the external facsimile apparatus. The image data is received via the NCU 14 and the received image data is demodulated. Also, when the image data is transmitted by facsimile, the third switch 27 of the NCU 14 is switched from the b side to the a side, and the modem 15 transmits a predetermined sequence such as sending a calling tone or detecting a called terminal identification signal. The image data is transmitted via the NCU 14. Although not shown, the modem 15 is provided with a band-pass filter (BPF: Band-pass filter), and detects a signal such as a calling tone by switching the frequency component that the band-pass filter passes.

  Next, operations of the NCU 14 and the modem 15 in the crime prevention mode will be described. When waiting for facsimile transmission / reception of image data and monitoring an abnormality in the room, the third switch 27 of the NCU 14 is switched to the b side, and a call signal from the PSTN 17 is monitored by the call detection device 28. The first switch 25 is switched to the b side and the second switch 26 is switched to the a side. The modem 15 and the sound collector 16 are connected by the first switch 25 and the second switch 26, and the sound collector 16 is collected. The sound signal is output to the modem 15. The modem 15 converts the input analog audio signal into a digital audio signal and outputs the digital audio signal to the control unit 2.

  The control unit 2 functions as a determination unit that determines whether the digital audio signal converted by the modem 15 is abnormal sound. Specifically, an abnormal sound (for example, a sound of a security buzzer for detecting a suspicious person provided in a room where the communication terminal device 1 is installed) is experimentally sounded and an abnormal sound pattern (frequency, amplitude, Phase) is stored in the RAM 11 in advance, and based on the abnormal sound pattern, the control unit 2 compares the digital sound signal with the abnormal sound pattern to determine whether the digital sound signal is abnormal sound or not. That is, it is determined whether an abnormal sound is detected in the room. Note that a plurality of abnormal sound patterns may be stored in the RAM 11 in advance so that the abnormal sound to be detected by the user can be selected from the operation unit 8 or the like.

  In addition, when the control unit 2 determines that the digital audio signal is abnormal sound, the control unit 2 notifies the occurrence of abnormality to a predetermined external communication terminal. Specifically, when it is determined that the digital audio signal is abnormal sound, the NCU 14 connects to the external communication terminal A to notify the occurrence of abnormality. In other words, the second switch 26 of the NCU 14 is switched from the a side to the b side, and the third switch 27 is switched from the b side to the a side from the state in which the image data is waiting for facsimile transmission and reception and the room abnormality is monitored. Thus, the modem 15 and the PSTN 17 are connected by the second switch 26 and the third switch 27. And the control part 2 calls the external communication terminal A memorize | stored in RAM11 with the modem 15, and when the line | wire with the external communication terminal A is connected, the audio | voice message which alert | reports that there exists abnormality memorize | stored in RAM11 is transmitted. Transmit to the external communication terminal A. In addition, when it is determined that the digital sound signal is abnormal sound, the control unit 2 measures the time during which the abnormal sound continues, and when the measured time exceeds a predetermined time, the control unit 2 You may make it notify abnormality occurrence. In this case, for example, only a continuous sound such as a sound of a security buzzer is detected and the occurrence of abnormality is notified to a predetermined external communication terminal, so that erroneous detection of the abnormal sound can be prevented.

  Further, the control unit 2 transmits the audio signal collected by the sound collector 16 to a predetermined external communication terminal. Specifically, the audio signal collected by the sound collector 16 is transmitted to the external communication terminal A by the NCU 14. That is, the first switch 25 of the NCU 14 is switched from the b side to the a side from the state in which the occurrence of the abnormality is notified, and the sound collector 16 and the PSTN 17 are connected by the first switch 25 and the third switch 27. . Then, the control unit 2 amplifies the audio signal (analog audio signal) collected by the sound collector 16 with the transmission amplifier 20 and transmits the amplified signal to the external communication terminal A.

  In the communication terminal device 1 configured as described above, processing operations executed when the crime prevention mode is set will be described based on the flowcharts shown in FIGS. 3 and 4. The processing operation of the communication terminal device 1 described based on the following flowchart is performed according to a command issued by the control unit 2 based on a control program stored in the ROM 3.

  First, the control unit 2 monitors an indoor audio signal (S1). Specifically, the sound signal collected by the sound collector 16 by the NCU 14 is collected by the sound collector 16 and the sound signal collected by the sound collector 16 is output to the modem 15. Next, the control unit 2 determines whether or not an abnormal sound has been detected (S2). If it is determined that an abnormal sound has been detected (S2: YES), the control unit 2 starts measuring the time during which the abnormal sound continues (S3). Next, the control unit 2 determines whether or not the measured time exceeds a predetermined time stored in the RAM 11 (S4). If it is determined that the measured time does not exceed the predetermined time (S4: NO), the process returns to S2, and if it is determined that no abnormal sound is detected (S2: NO), the control unit 2 performs measurement. The time is reset and the process is terminated (S13). If it is determined that the measured time exceeds the predetermined time (S4: YES), the control unit 2 calls the external communication terminal A stored in the RAM 11 by the modem 15 (S5). When the line with the external communication terminal A is connected (S6: YES), the control unit 2 transmits information notifying that an abnormality has occurred (S7). For example, the voice message “An error has occurred in the room” stored in the RAM 11 is transmitted via the NCU 14 and the modem 15.

  Next, the control unit 2 transmits the audio signal collected by the sound collector 16 to the external communication terminal A by the NCU 14 (S8). Here, for example, when a message requesting input of a command is transmitted, and a command is input from the external communication terminal A by the user and accepted (S9: YES), the control unit 2 performs processing according to the command. (S10). The command transmitted by the external communication terminal A is transmitted as a push tone signal or the like, and the modem 15 detects this push tone signal and outputs it to the control unit 2. The control unit 2 that has received the command calls a telephone number of a security company stored in the RAM 11 to send a predetermined message, a process to ring a predetermined bell sound or buzzer sound by a speaker outside the figure, Processing for canceling the crime prevention mode and shifting the device 1 to the normal mode is performed.

  When the line with the external communication terminal A is disconnected (S11: YES), the control unit 2 stores in the RAM 11 a log such as the time when the abnormality has occurred and what processing has been performed (S12). Then, the control unit 2 resets the measured time (S13).

  For example, when the image capturing device B having a security camera or the like is installed in a room, the communication terminal device 1 and the image capturing device B are connected as shown in FIG. The image data may be transmitted to the external communication terminal A. In this case, as shown in FIG. 5, after the process of S7, the control unit 2 transmits a predetermined command to the image capturing apparatus B (S31). The image capturing device B receives this command, captures image data in the room, and transfers the captured image data to the communication terminal device 1 via the LAN 18. When the image data transferred by the image capturing device B is acquired (S32: YES), the control unit 2 transmits the acquired image data to the external communication terminal A via the NCU 14 and the modem 15 (S33). Thereafter, the processing operations of S9 to S13 are performed.

  In the present embodiment, a case has been described in which a voice message is transmitted to the external communication terminal A via the PSTN 17 to notify the occurrence of an abnormality, but the notification means is limited to this if the occurrence of the abnormality can be notified to the outside. For example, an e-mail in which a message for notifying the occurrence of an abnormality is written in the text is created, and an audio signal collected by the sound collector 16 is attached in a predetermined file format to the router 21. It is also possible to send an e-mail to an external communication terminal that can receive mail to notify the occurrence of an abnormality, or to notify the occurrence of an abnormality wirelessly. Similarly, the image data captured by the image capturing apparatus B can be attached to an email and transmitted to an external communication terminal. Furthermore, the communication terminal apparatus 1 and an external PC are connected via peer-to-peer via the LAN 18, and the audio signal collected by the sound collector 16 and the image data taken by the image photographing apparatus B are in a predetermined format. Streaming distribution may be performed.

  The present invention can be applied to, for example, a communication terminal device provided with a modem.

It is a figure which shows the structural example of the communication terminal device which concerns on embodiment of this invention. It is a figure which shows the structural example of NCU of the communication terminal device which concerns on embodiment of this invention. It is the flowchart which showed the processing operation which the communication terminal device which concerns on embodiment of this invention performs in the case of a crime prevention mode. It is the flowchart which showed the processing operation which the communication terminal device which concerns on embodiment of this invention performs in the case of a crime prevention mode. It is the flowchart which showed the processing operation which the communication terminal device which concerns on embodiment of this invention performs in the case of a crime prevention mode.

Explanation of symbols

1 Communication terminal device 2 Control unit 3 ROM
10 Communication unit 11 RAM
14 NCU
15 modem 16 sound collector 17 PSTN
25 First switch 26 Second switch 27 Third switch 28 Call detection device A External communication terminal B Image photographing device

Claims (7)

A communication terminal device comprising a modem that performs modulation for converting a digital signal into an analog signal for transmission via a public telephone line and demodulation for converting an analog signal received via a public telephone line into a digital signal,
Call detection means for detecting a call signal from a public telephone line, switching means for switching connection between the public telephone line and the modem or the call detection means, and a state in which the public telephone line and the modem are connected by the means A communication means for performing communication at the time, a sound collector that collects a sound signal in a room and outputs it to a predetermined output destination, and a sound signal collected by the sound collector is output to the modem. Determining means for determining whether or not the digital audio signal converted by the modem is abnormal sound; and when the means determines that the digital audio signal is abnormal sound, an abnormality occurs in a predetermined external communication terminal. A communication terminal device comprising: notification means for notifying.   Storage means for storing the abnormal sound pattern is provided, and the determination means determines whether the digital audio signal is abnormal sound based on the abnormal sound pattern stored in the storage means. The communication terminal device according to claim 1. A connection blocking means for connecting or disconnecting the sound collector and the modem; a receiving means for receiving a designation of either a security mode or a normal mode; and the security mode or the security mode based on the designation received by the means Setting means for setting any of the normal modes,
When the crime prevention mode is set by the setting means, the connection blocking means connects the sound collector and the modem, and the sound collector outputs the collected sound signal to the modem. ,
3. The communication terminal device according to claim 1, wherein when the normal mode is set by the setting unit, the connection cut-off unit cuts off the connection between the sound collector and the modem. When the determination unit determines that the digital audio signal is abnormal sound, the measurement unit includes a measurement unit that measures a time during which the abnormal sound continues,
4. The notification unit according to claim 1, wherein when the time measured by the measurement unit exceeds a predetermined time, the notification unit notifies the predetermined external communication terminal of the occurrence of an abnormality. Communication terminal device.   5. The communication terminal device according to claim 1, wherein the notifying unit notifies an abnormality occurrence to the predetermined external communication terminal via a public telephone line.   6. The notification unit according to claim 1, wherein the notification unit notifies the predetermined external communication terminal of the occurrence of the abnormality and transmits an audio signal collected by the sound collector. Communication terminal device. When the determination means determines that the digital audio signal is abnormal sound, the image pickup apparatus includes an acquisition means for capturing the image data in the room and acquiring it.
6. The notification unit according to claim 1, wherein the notifying unit notifies the predetermined external communication terminal of the occurrence of the abnormality and transmits the indoor image data acquired by the acquiring unit. Communication terminal device.

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