JP2009094813A - Telephone call recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To create recording data more accurately without increasing the burden of operation on a user when telephone calls passed through a private branch exchange are recorded by the call unit. <P>SOLUTION: The telephone call recording device 4 records the telephone calls passed through the PBX connecting outside lines 11 to 13 to an extension telephone set 21, and includes a speech recognition unit 45 which performs speech recognition on a speech signal from the extension telephone set 21, a speech recording unit 44 which performs recording from the extension telephone set 21, and a recording control unit 46 which controls the start and stop of recording of the speech signal by the speech recording unit 44, the recording control unit 46 performing control to start or stop the recording of the speech signal when a recognition results of the speech signal matches a prescribed pattern and the voltage value of the speech signal exceeds a prescribed threshold. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a call recording apparatus for recording a call using a public line network.

In companies and the like, private branch exchanges are provided for connecting between extension telephones and connecting an extension telephone to an external line connected to a public line network when a large number of telephones are required. In such a case, a call recording device may be provided for recording the contents of a call when an incoming call is made from an external line to an extension telephone or an outgoing call is made from an extension telephone to an external line. Examples of this type of call recording device include those described in Non-Patent Documents 1 to 3 below.
"High-performance call recording adapter MX-1", [online], Nagatsuka Telephone Industrial Co., Ltd. [searched September 26, 2007], Internet <URL: http://www.nagatsuka.co.jp/adp /index.html> “Digital Voice Recorder VR-D160”, [online], Takacom Co., Ltd. [searched September 26, 2007], Internet <URL: http://rusuden.jp/rusuden_rokuon2.html> "Network-compatible long-term recording system NVR-5000 / 40", [online], Sophia Systems, Inc. [searched September 26, 2007], Internet <URL: http://www.sophia-systems.co. jp / nvr / nvr_hook.html>

  In the call recording apparatus as described above, the recording data for each call is facilitated by creating and storing the recording data for each call. For example, in order to recognize the start and end of one call and create recording data for each call, a method of manually recognizing with a reed switch connected to the telephone, or a method of automatically recognizing according to the voltage level of the call voice For example, a method of recognizing using a sensor that detects on-hook / off-hook of the handset is used.

  However, when the start and stop of recording are controlled by the voltage level of the call voice, it is difficult to accurately recognize one call with respect to the fluctuation of the voice level. In particular, when a private branch exchange is provided between the outside line and the extension telephone, the voltage level varies depending on the specifications of the private branch exchange, so it is necessary to set and change the voltage level judgment standard for each exchange. Further, when recording is controlled manually, the user's operation occurs and the operation becomes complicated, and it is difficult to realize recording for each call due to forgetting the operation.

  Therefore, the present invention has been made in view of such problems, and when recording a call through a private branch exchange in units of one call, recording data can be created more accurately without increasing the operation burden on the user. It is an object of the present invention to provide a call recording device that can be used.

  In order to solve the above problems, a call recording apparatus according to the present invention is a call recording apparatus for recording a call via an exchange for connecting an external line connected to a public line network and an extension telephone, and an audio signal from the extension telephone Based on the recognition result by the voice recognition unit that receives the voice signal from the extension telephone, the voice recording unit that receives the voice signal from the extension telephone and records the voice signal, A recording control unit that controls start and stop of recording of the audio signal by the audio recording unit, and the recording control unit matches the recognition result of the audio signal with a predetermined pattern, and the voltage value of the audio signal is predetermined If the threshold value is exceeded, control is performed to start or stop recording of the audio signal.

  According to such a call recording device, the recording control unit controls the start and stop of recording of the voice signal in the voice recording unit based on the result of the voice recognition of the voice signal transmitted and received by the extension telephone by the voice recognition unit. In this case, recording is started or stopped when the recognition result of the audio signal is a predetermined pattern and the voltage value of the audio signal is equal to or greater than a predetermined threshold. Thereby, since both the sound pressure level and the voice recognition result are taken into account, the start timing or end timing of one call is recognized, so that erroneous recognition of a call break is prevented and more accurate recording is performed for each call. A data file can be created and the operation burden on the user can be reduced.

  Each extension telephone is provided with a handset interface for connection to the handset, and the voice recognition unit and the voice recording unit are configured to be able to receive a voice signal via the handset interface. preferable. In this way, when recording an audio signal in an extension telephone connected to a handset, it is possible to easily connect to the extension telephone and to transmit / receive to / from an external line without providing a new connection interface. The voice signal can be received by the voice recognition unit and the voice recording unit.

  According to the call recording apparatus of the present invention, when recording a call through the private branch exchange in units of one call, it is possible to create recorded data more accurately without increasing the operation burden on the user.

  Hereinafter, preferred embodiments of a call recording apparatus according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  In the present invention, in order to create accurate recording data for each call in the recording of a call via a private branch exchange, both the content of recognition of the audio signal transmitted and received by the extension telephone and the sound pressure level are used at the same time. Focused on. Therefore, the present invention is configured to receive a voice signal from an extension telephone, perform voice recognition processing on the voice signal by a call recording device, and create recording data based on the processing result.

  In the present embodiment, the present invention is applied to a call recording device for recording a call in a private branch exchange system using PBX (Private Branch eXchange) for connecting an outside line and an extension line. The call recording apparatus according to the present embodiment is connected to the handset interface of each extension telephone, and captures and records a voice signal transmitted / received between the extension telephone and the external line via the handset interface.

  FIG. 1 is a schematic configuration diagram of a private branch exchange system 1 according to a preferred embodiment of the present invention. The private telephone exchange system 1 is provided between three first external lines 11, second external lines 12, and third external lines 13 connected to a public line network 2 and five internal telephones 21, 22, 23, 24, 25. Are switched by PBX3. These extension telephones 21, 22, 23, 24, and 25 are assigned extension number 101, extension number 102, extension number 103, extension number 104, and extension number 105, respectively. When connecting the external lines 11 to 13 and the extension telephones 21 to 25, the PBX 3 connects the external lines 11 to 13 to the extension lines 21a to 25a connected to the extension telephones 21 to 25. In the private branch exchange system 1, the call recording device 4 records a call between the outside lines 11 to 13 and the extension telephones 21 to 25.

  The external lines 11 to 13 are, for example, ISDN (Integrated Services Digital Network) lines, and transmit audio signals that are digital signals. The external lines 11 to 13 transmit voice signals and data signals in a call as digital signals, and also transmit communication control signals such as telephone number data of the other party as digital signals. The external lines 11 to 13 are set with telephone numbers for external lines.

  The PBX 3 is a digital private branch exchange that connects between the outside lines 11 to 13 and the extension telephones 21 to 25 or between the extension telephones 21 to 25. In the PBX 3, when an incoming call is received from an external line, the incoming external lines 11 to 13 are connected to the extension telephones 21 to 25 corresponding to the extension number dialed by the caller side, and when the outgoing call is made to the external line, the extended telephones 21 to 25 are not connected. Connect to the used external lines 11-13. Moreover, in PBX3, the extension telephones 21-25 which were transmitted at the time of the telephone call between the extension telephones 21-25 are connected to the applicable extension telephones 21-25.

  In PBX 3, signals transmitted from the external lines 11 to 13 to the internal lines 21a to 25a are converted into signals of a communication system according to digital signals on the internal lines, and signals transmitted from the internal line 21a to the external lines 11 to 13 are converted to ISDN lines. The signal is converted to a communication method signal according to the method. The extension lines 21a to 25a are digital lines according to the digital system of PBX3 and transmit digital signals.

  The extension telephones 21 to 25 are telephones that can make a telephone call in a digital manner according to the PBX3 manner, and transmit and receive voices and the like by digital signals. For this purpose, the telephone main bodies 21b to 25b of the extension telephones 21 to 25 convert the digital voice signal transmitted from the PBX 3 via the extension lines 21a to 25a into analog voice signals and transmit them to the receivers 21c to 25c. The analog audio signals from 21c to 25c are converted into digital audio signals and transmitted to PBX 3 via extensions 21a to 25a. Furthermore, the extension telephones 21 to 25 are respectively connected to handsets 21d to 25d via the handset interface 41, and the telephone bodies 21b to 25b can transmit and receive analog voice signals to and from the handsets 21d to 25d. It is configured as possible. The handset interface 41 converts and amplifies analog audio signals sent from the telephone bodies 21b to 25b into electric signals for the handsets 21d to 25d, while the electric signals sent from the handsets 21d to 25d are converted to the telephone main bodies 21b to 21d. It has a function of converting and amplifying it into an analog audio signal for 25b.

  The call recording device 4 is a device for recording a call when an outside line is transmitted or received, and is connected to a handset interface 41 provided between the extension telephones 21 to 25 and the handsets 21d to 25d.

  Hereinafter, the configuration of the call recording device 4 will be described in detail with reference to FIG. 2, only the connection relationship between the call recording device 4 and the extension telephone 21 is shown, and illustration and description of the connection relation with the other extension telephones 22 to 25 are omitted.

  The call recording device 4 receives an analog voice signal such as a call voice transmitted and received between the extension telephone 21 and the handset 21d via the handset interface 41, converts the analog voice signal into a digital signal and stores it. To do. This call recording device 4 is connected to a personal computer (hereinafter referred to as a personal computer) 50 via a LAN (Local Area Network) 42 in order to reproduce the recorded call voice, and stores it in response to a request from the personal computer 50. A data file including the call voice being sent is transmitted to the personal computer 50. For this purpose, the call recording device 4 includes a code decoding unit (CODEC) 43, a CPU 47 including a voice recording unit 44, a voice recognition unit 45, and a recording control unit 46, and an information storage unit (recording file storage unit) 48. I have.

  The CODEC 43 connects between the call recording device 4 and the handset interface 41, an external line incoming or external line analog voice signal transmitted / received between the external lines 11-13 converted and amplified in the handset interface 41 and the telephone body 21b. Received via the communication cable 49, and converts those analog audio signals into digital audio signals. The CODEC 43 transmits the converted digital audio signal to the audio recording unit 44 and the audio recognition unit 45. The CODEC 43 also receives a control signal for operating the voice recording data transmitted from the telephone main body 21 b, converts the control signal into a digital signal, and transmits the digital signal to the recording control unit 46.

  The voice recognition unit 45 performs voice recognition processing on the digital voice signal received from the CODEC 43 and outputs the recognition result to the recording control unit 46 sequentially. At this time, processing methods such as HMM (Hidden Markov Model) method and NN (Neural Network) method are adopted as the speech recognition processing, and the character string data subjected to speech recognition is sent to the recording control unit 46 as it is. The

  The audio recording unit 44 converts the digital audio signal received from the CODEC 43 into an audio data file in a predetermined data format based on the control of the recording control unit 46, and is configured by an information storage medium such as a hard disk or a memory. Store in the storage unit 48. At this time, the voice recording unit 44 determines the start timing of creation and end of creation of one voice data file based on an instruction signal from the recording control unit 46. The voice recording unit 44 receives a control signal related to the telephone number (caller telephone number) of the call partner via the external lines 11 to 13, the PBX 3, and the extension telephone 21, and reads the call partner's telephone number read from the control signal. The telephone number is stored in the information storage unit 48 together with the voice data file. Specifically, the voice recording unit 44 issues an identification number for each external line call, and associates the identification number with the identification number in the information storage unit 48, so that the voice data file name, extension number, call for each external line call Manage the other party's phone number, call time, etc.

  The data format of the audio data file at this time can be selected from various methods such as MP3 (MPEG Audio Layer-3) and WAVE. Note that the audio recording unit 44 stores the digital audio signal in a temporary storage area or the like in the RAM or the information storage unit 48, and in response to an instruction signal from the recording control unit 46, the audio recording unit 44 outputs the audio from the digital audio signal. It is also possible to create and store data files. The voice recording unit 44 also detects the voltage level of the call voice from the digital voice signal received from the CODEC 43 and sequentially outputs data indicating the voltage level value to the recording control unit 46.

  The recording control unit 46 starts the recording of the digital voice signal by the voice recording unit 44 based on the voice recognition result output from the voice recognition unit 45 and the voltage level value of the call voice output from the voice recording unit 44. And control stop. That is, the recording control unit 46 determines whether or not the character string data generated by the voice recognition process of the voice recognition unit 45 matches a predetermined pattern. The recording control unit 46 also determines whether the voltage level value of the call voice output from the voice recording unit exceeds a predetermined threshold value. The parameter information regarding these predetermined patterns and threshold values is stored in advance in the information storage unit 48, and the recording control unit 46 reads the parameter information from the information storage unit 48 and determines the character string data and the voltage level value. The recording control unit 46 creates a voice data file when the character string data at a certain timing matches a predetermined start pattern and the voltage level value of the call voice at the same timing is equal to or greater than a threshold value. An instruction signal for instructing the start is sent to the voice recording unit 44. On the other hand, when the character string data at a certain timing matches a predetermined end pattern and the voltage level of the call voice at the same timing is equal to or less than a threshold value, the recording control unit 46 passes the predetermined time. In addition, an instruction signal for instructing the end of creation of the audio data file is sent to the audio recording unit 44. For example, as a predetermined pattern for recognizing the start or end of a call, “Thank you” or “I ’m sorry” in addition to the names of companies and people such as “XX Corporation” and “Suzuki”. Or a predetermined phrase such as can be set. As the voltage level threshold, an appropriate value is set so that various control signals and noise are not mistakenly recognized as call voice.

  The recording control unit 46 can also receive a control signal for manipulating the recording data from the telephone body 21b via the CODEC 43, and determine the start and stop timings of the digital audio signal based on the control signal. . Further, based on this control signal, the voice data file stored in the information storage unit 48 is converted into a data format corresponding to the CODEC 43, and is sent to the handset interface 41 of the telephone body 21b via the CODEC 43, so that the extension telephone In 21, an analog audio signal can be reproduced.

  Further, in response to a request for recording information from the personal computer 50, the recording control unit 46 identifies the identification number, extension number, telephone number of the call partner, call start time, and the like stored in the information storage unit 48, and Recording information including the call end time is transmitted to the personal computer 50. Further, the recording control unit 46 transmits a voice data file corresponding to the corresponding identification number stored in the information storage unit 48 to the personal computer 50 in response to a call voice request including the identification number from the personal computer 50.

  The personal computer 50 will also be described with reference to FIG.

  The personal computer 50 is a personal computer provided with an audio output device, and is connected to the call recording device 4 via the LAN 42. In the personal computer 50, the call voice is reproduced in response to a call voice reproduction request from the user. For this purpose, the personal computer 50 includes a recording information search unit 51 and a call voice reproduction unit 52. These units 51 and 52 are realized by executing a dedicated program installed in the personal computer 50 on the personal computer 50. The call voice reproduction unit 52 also includes a voice output device such as a sound source board or a speaker, and reproduces the call voice using the voice output device.

  The recording information search unit 51 transmits a request for recording information to the call recording device 4 when a request for reproducing the call voice is input from the user. When the recording information is transmitted from the call recording device 4 in response to the request, the recording information search unit 51 displays a list in which the extension number, the telephone number of the other party, the call start time, and the call end time are listed for each external line call. It is displayed on a display (not shown) of the personal computer 50. When the user selects one or a plurality of external calls from this list, the recording information search unit 51 transmits a call voice request indicating an identification number corresponding to the selected external call to the call recording device 4. .

  Alternatively, the recording information search unit 51 transmits a request for recording information to the call recording device 4 when an extension number is input together with a call voice reproduction request from the user. When the recording information is transmitted from the call recording device 4 in response to the request, the recording information retrieval unit 51 retrieves the extension number input by the user from the transmitted recording information and corresponds to the retrieved extension number. A call voice request indicating the identification number to be transmitted is transmitted to the call recording device 4.

  When a voice data file is transmitted from the call recording device 4 in response to a call voice request, the call voice playback unit 52 converts the voice data file into a data format in the voice output device of the personal computer 50. Then, the call voice reproduction unit 52 outputs the converted voice data file to the voice output device, and plays the call voice in the voice output device.

  Next, the operation of the call recording apparatus will be described with reference to FIGS. Here, a case will be described as an example where an external telephone is called to the extension telephone 21 with the extension number (101). Note that the basic operation is the same when making an outside line call from the extension telephone 21.

  When the extension telephone 21 receives an incoming call from the public line network 2 via the second external line 12, the PBX connects the second external line 12 to the extension telephone 21 corresponding to the extension number (101) dialed by the other party. To do. When connected, the extension telephone 21 rings a ringing tone.

  When the user picks up the handset 21c according to the ringing tone, a communication path is established between the extension telephone 21 and the other party's telephone, and the extension telephone 21 and the other party are communicated with each other via the public network 2, the outside line 12, and the extension 21a. Call voice signals are transmitted and received between the two. Call voices to be transmitted and received are simultaneously transmitted and received as an analog voice signal between the extension telephone 21 and the handset 21 d, and this analog voice signal is sent to the call recording device 4 via the handset interface 41.

  On the other hand, in the call recording device 4, the voice recording unit 44 detects the voltage level of the call voice from the digital voice signal received from the CODEC 43, and sequentially outputs data indicating the voltage level value to the recording control unit 46. . At the same time, the voice recognition unit 45 executes voice recognition processing on the digital voice signal received from the CODEC 43 and outputs the recognition result to the recording control unit 46 sequentially.

  Next, the recording control unit 46 determines whether or not the character string data generated by the voice recognition process matches a predetermined pattern, and at the same time, determines whether or not the voltage level value of the call voice exceeds a predetermined threshold value. The judgment is also made. The recording control unit 46 creates a voice data file when the character string data at a certain timing matches a predetermined start pattern and the voltage level value of the call voice at the same timing is equal to or greater than a threshold value. An instruction signal for instructing the start is sent to the voice recording unit 44. On the other hand, when the character string data at a certain timing matches a predetermined end pattern and the voltage level of the call voice at the same timing is equal to or less than a threshold value, the recording control unit 46 passes the predetermined time. In addition, an instruction signal for instructing the end of creation of the audio data file is sent to the audio recording unit 44. As a result, the audio recording unit 44 divides the digital audio signal at the start timing and end timing determined by the recording control unit 46 and stores them in the information storage unit 48 as an audio data file.

  Thereafter, when the user puts the handset 21c, the communication path between the extension telephone 21 and the telephone of the other party is opened, and the PBX 3 also disconnects the connection between the second outer line 12 and the extension 21a, and the outer line call ends.

  The operation at the time of reproducing the last recorded call voice will be described. The user operates the personal computer 50 and inputs a call voice reproduction request. The personal computer 50 transmits a request for recording information to the call recording device 4 in response to the reproduction request.

  In response to the request for the recording information, the call recording device 4 transmits the identification number, extension number, caller's phone number, call start time, and call end time for every stored external line call to the PC 50. To do.

  When the personal computer 50 receives the recording information from the call recording device 4, it displays a list in which the extension number, the telephone number of the other party, the call start time, and the call end time are listed for each external call. When the user selects an outside line call from the list, the personal computer 50 transmits a request for an audio data file indicating an identification number corresponding to the selected outside line call to the call recording device 4.

  In response to a call voice request, the call recording device 4 extracts a voice data file corresponding to the identification number and transmits it to the personal computer 50.

  When the personal computer 50 receives the voice data file, it converts the voice data file into a data system in the voice output device of the personal computer 50, and outputs a call voice from the voice output device.

  According to the call recording device 4 described above, the recording control unit 46 starts recording of the voice signal in the voice recording unit 44 based on the result of the voice recognition of the voice signal transmitted and received by the extension telephone 21 by the voice recognition unit 45. And stopping is controlled. In that case, recording is started or stopped when the recognition result of the audio signal is a predetermined start pattern and the voltage level value of the audio signal is equal to or greater than a predetermined threshold. On the other hand, recording is stopped when the recognition result of the sound signal is a predetermined end pattern and the case where the voltage level value of the sound signal is equal to or lower than a predetermined threshold continues for a predetermined time. Thereby, since both the sound pressure level and the voice recognition result are taken into account, the start timing or the end timing of one external line call is recognized, so that erroneous recognition of a call break is prevented and more accurate for each call. Recording data files can be created and the operation burden on the user can be reduced.

  Further, the extension telephone 21 is provided with a handset interface 41 for connection to the handset 21d, so that the voice recognition unit 45 and the voice recording unit 44 can receive digital voice signals via the handset interface 41. Thus, when recording an audio signal in the extension telephone 21 to which the handset 21d is connected, the extension telephone 21 can be easily connected, and the outside line 11 can be provided without providing a new connection interface. ˜13 can be received by the voice recognition unit 45 and the voice recording unit 44.

  The embodiments according to the present invention have been described so far, but the present invention is not limited to the above-described embodiments and can be implemented in various forms.

  For example, the call recording device 4 may be directly connected to the telephone body 21b without passing through the handset interface 41, or may be directly connected to the PBX 3.

  In addition to reproducing the call voice data recorded by the call recording device 4 with a personal computer or an extension telephone, a call voice reproducing unit may be provided in the device main body of the call recording device 4 so that the voice can be reproduced with the device main body. .

  In this embodiment, an ISDN line is used as an external line, and a digital PBX and an internal line are used. However, an analog system, a VoIP (Voice over Internet Protocol) system, etc. may be adopted as an external line. , PBX and extension may be analog.

1 is a schematic configuration diagram showing a private branch exchange system according to a preferred embodiment of the present invention. It is a schematic block diagram of the telephone call recording apparatus of FIG.

Explanation of symbols

  21-25 ... extension telephones, 21d-25d ... handset, 11-13 ... external line, 2 ... public line network, 4 ... call recording device, 41 ... handset interface, 44 ... voice recording unit, 45 ... voice recognition unit, 46 ... Recording control unit, 48... Information storage unit.

Claims (2)

A call recording device for recording a call through an exchange for connecting an external line connected to a public network and an extension telephone,
A voice recognition unit that receives a voice signal from the extension telephone and recognizes the voice signal;
A voice recording unit that receives a voice signal from the extension telephone and records the voice signal;
Based on the recognition result by the voice recognition unit, a recording control unit for controlling start and stop of recording of the voice signal by the voice recording unit;
With
The recording control unit starts or stops recording of the audio signal when the recognition result of the audio signal matches a predetermined pattern and the voltage value of the audio signal exceeds a predetermined threshold. To control,
A call recording device characterized by that. Each of the extension telephones is provided with a handset interface for connecting to a handset,
The voice recognition unit and the voice recording unit are configured to receive the voice signal via a handset interface.
The call recording apparatus according to claim 1.

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