JP2019041270A - Telephone conversation sound recording system and telephone conversation sound recording adapter - Google Patents

Abstract

To allow for recording of the voice of the other party, along with the speech voice on the own station side, in a telephone conversation device capable of telephone conversation by software processing, but not capable of recording the voice of the other party.SOLUTION: A smart phone 1 is a telephone conversation device capable of telephone conversation by software processing, but not capable of recording the voice of the other party, and a telephone conversation recording adapter 3 is connected with them, respectively, between the smart phone 1 and a voice interface 2. The telephone conversation recording adapter 3 attenuates earphone audio-signal outputted from the smart phone 1, and mixes the earphone audio signal after attenuation with the microphone audio-signal supplied from the microphone 22 of the voice interface 2 to the telephone conversation device. The smart phone 1 records the microphone audio-signal, mixed with earphone audio-signal after attenuation, as digital data by software processing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a call recording system and a call recording adapter.

  In recent years, there is a mobile phone device such as a smartphone capable of recording a call (see, for example, Patent Document 1).

JP 2013-183404 A

  In call recording, it is necessary to acquire both the voice of a user who operates a calling device such as a smartphone and the voice of the other party as voice data.

  For example, in the case of a smartphone equipped with Android OS, a recording function provided by Android OS is used for voice recording such as call recording.

  Here, in the Android OS, a MediaRecorder class is defined for audio recording, and further, MediaRecorder. An AudioSource class is defined.

  MediaRecorder. In the AudioSource class, microphone input (MIC), voice call (voice call: VOICE_CALL), and the like are defined as audio sources.

  Therefore, when Android OS is appropriately installed in a call device such as a smartphone, call recording can be performed by selecting a voice call as an audio source and performing voice recording.

  However, in general, when Android OS is installed in a communication device such as a smartphone, the vendor of the communication device selects Voice Call as an audio source in order to install Android OS in the communication device while performing customization specific to its own device. Voice recording may not be implemented properly, and call recording (particularly recording the voice of the other party) may not be possible with this method. In particular, when the version of an operating system (here, AndroidOS) is upgraded, troubles are likely to occur in call recording by this method.

  Also, in some countries, recording of the voice of the other party is prohibited by law, so there is a call device that does not uniformly implement call recording as a specification.

  In the call device in these states, a call can be made by software processing, but the voice of the other party cannot be recorded.

  Of course, for example, the voice of the other party can be output using a speaker or the like, and the voice can be recorded by a device (such as a voice recorder) different from the calling device, but another device is required. The cost required for equipment necessary for recording a call increases, which is not realistic.

  The present invention has been made in view of the above problems, and in a call device that can make a call by software processing but cannot record the other party's voice by software processing, the call partner along with the call voice on the local station side. An object of the present invention is to obtain a call recording system capable of recording the voice of the telephone and a call recording adapter usable for the call recording system.

  The call recording system according to the present invention includes a call device that can make a call by software processing but cannot record a voice of a call partner, a voice interface including a microphone and an earphone, the call device, and the voice. A call recording adapter connected to the above-described call device and the above-described voice interface is provided between the interfaces. Then, the communication device includes a voice input circuit that receives a microphone voice signal from the outside, a voice output circuit that outputs the earphone voice signal to the outside, and a recording process that records voice based on the microphone voice signal as digital data by software processing A part. The call recording adapter also includes a mixing circuit that attenuates the earphone audio signal output from the call device and mixes the attenuated earphone audio signal with the microphone audio signal supplied from the microphone of the audio interface to the call device. Then, the recording processing unit of the communication device records the microphone audio signal mixed with the attenuated earphone audio signal as digital data by software processing.

  The call recording adapter according to the present invention includes a call device that can make a call by software processing but cannot record a call partner's voice, and a voice interface including a microphone and an earphone. A call recording adapter connected to each of the above-described audio interfaces, which attenuates the earphone audio signal output from the communication device and supplies the attenuated earphone audio signal from the microphone of the audio interface to the communication device. A mixing circuit for mixing with the microphone audio signal is provided. The mixing circuit includes only passive elements that do not require a power supply, and the value of the passive element of the mixing circuit is set according to the output impedance of the microphone of the voice interface.

  According to the present invention, a call recording system capable of recording a call partner's voice together with a call voice of the own station side in a call device capable of making a call by software processing but not recording a call partner's voice by software processing, and its The call recording adapter which can be used for such a call recording system is obtained.

  These and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

FIG. 1 is a diagram showing a configuration of a call recording system according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the call recording system according to the embodiment of the present invention. FIG. 3 is a diagram for explaining analog voice connectors (plugs and jacks) in the call recording system shown in FIGS. 1 and 2. FIG. 4 is a circuit diagram showing a configuration of the call recording adapter according to the first embodiment. FIG. 5 is a circuit diagram showing a configuration of the call recording adapter according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.

  FIG. 1 is a diagram showing a configuration of a call recording system according to an embodiment of the present invention. The call recording system shown in FIG. 1 includes a smartphone 1, a voice interface 2, and a call recording adapter 3. The smartphone 1 is a call device that incorporates a computer and performs call processing by executing a program on the computer (that is, by software processing). Furthermore, the smartphone 1 is a calling device that can make a call by software processing but cannot record the voice of the other party by software processing. That is, the smartphone 1 cannot immediately record the voice data of the other party's voice received during a call. Here, although the smartphone 1 is used as the call device, a portable personal computer, a tablet PC (Personal Computer), or the like may be used instead.

  In this embodiment, the smartphone 1 is an Android OS-equipped smartphone, and the Android OS can record the microphone input of the audio source, but can record the voice call of the audio source (that is, the mobile phone 1). Recording of both the voice of the user on the station side and the voice of the other party is not possible.

  The audio interface 2 includes a microphone and an earphone, and is a device such as a headset or an earphone set that is used by the user of the smartphone 1 during a call.

  The call recording adapter 3 is connected to the smartphone 1 and the voice interface 2 between the smartphone 1 and the voice interface 2 and has a specific function as described below. The call recording adapter 3 may be in the form of a cable or a module. The call recording adapter 3 may be built in the voice interface 2 or may be separate from the voice interface 2.

  FIG. 2 is a block diagram showing the configuration of the call recording system according to the embodiment of the present invention.

  As shown in FIG. 2, the smartphone 1 includes a wireless communication device 11, an arithmetic processing device 12, a storage device 13, an audio output circuit 14, an audio input circuit 15, and an analog audio connector 16.

  The wireless communication device 11 is a wireless communication unit that can be connected to a wireless LAN interface or a mobile phone network, and performs data communication for a call. This establishes a call with the other party's device. Note that the other party's device may be a telephone or a personal computer installed with voice communication software.

  The arithmetic processing unit 12 includes a computer having, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and loads various programs into the RAM and executes them by the CPU. It operates as a processing unit that performs processing. The storage device 13 is a non-volatile storage device that stores programs and data, such as a flash memory.

  Here, the arithmetic processing unit 12 operates as a call processing unit 12a, a recording processing unit 12b, and the like.

  The call processing unit 12a controls the wireless communication device 11 to (a) receive voice data of a call partner, convert it into a digital voice signal, and output it to the voice output circuit 14 with a predetermined communication protocol. The digital audio signal of the user of the smartphone 1 supplied from the audio input circuit 15 is received and converted into audio data, and the audio data is transmitted.

  The recording processing unit 12b stores the microphone input voice data (that is, voice data obtained by converting the digital voice signal received from the voice input circuit 15) in the storage device 13 or the like as a file of a predetermined data format. .

  That is, the recording processing unit 12b records sound based on the microphone sound signal as digital data by software processing. Specifically, the recording processing unit 12b records a microphone audio signal mixed with the earphone audio signal attenuated by the call recording adapter 3 as digital data by software processing.

  The audio output circuit 14 generates an earphone audio signal (analog audio signal) from the above-described digital audio signal and outputs it through the analog audio connector 16. The audio output circuit 14 includes a D / A (Digital to Analog) converter, an amplifier, and the like.

  The audio input circuit 15 receives a microphone audio signal (analog audio signal) via the analog audio connector 16, converts it into a digital audio signal, and outputs the digital audio signal. The audio input circuit 15 includes a microphone amplifier, an A / D (Analog to Digital) converter, and the like.

  The analog audio connector 16 is one jack of a specific type and is connected to the audio output circuit 14 and the audio input circuit 15.

  As shown in FIG. 2, the audio interface 2 includes earphones 21 </ b> L and 21 </ b> R that output sound to the left and right ears of the user of the smartphone 1, a microphone 22 that collects sound emitted by the user of the smartphone 1, And an analog audio connector 23. In this embodiment, the audio interface 2 includes the stereo earphones 21L and 21R, but may instead include one (that is, monaural) earphone.

  The analog audio connector 23 is a specific type of plug corresponding to the analog audio connector 16.

  FIG. 3 is a diagram for explaining analog voice connectors (plugs and jacks) in the call recording system shown in FIGS. 1 and 2.

  For example, as shown in FIG. 3, the analog audio connector 16 and the analog audio connector 23 include a left earphone audio signal terminal EP-L, a right earphone audio signal terminal EP-R, a microphone audio signal terminal (monaural) MIC, and A 4-pole jack and plug having a ground terminal GND is used.

  Therefore, the analog voice connector 23 and the analog voice connector 16 can be connected to each other. If the call is not recorded and only the call is made, the analog voice connector 23 and the analog voice connector 16 do not go through the call recording adapter 3. A telephone call can be made by connecting the smartphone 1 and the voice interface 2 to each other.

  FIG. 4 is a circuit diagram showing the configuration of the call recording adapter 3 according to the first embodiment.

  As shown in FIG. 4, the call recording adapter 3 includes an analog voice connector 31 having the same format as the analog voice connector 23, an analog voice connector 32 having the same format as the analog voice connector 16, and a mixing circuit 33.

  The mixing circuit 33 attenuates the earphone audio signal output from the smartphone 1 (that is, the voltage / power audio signal that can output audio from the earphones 21L and 21R of the audio interface 2), and the attenuated earphone audio signal Are mixed with the microphone audio signal supplied from the microphone 22 of the audio interface 2 to the smartphone 1.

  In the first embodiment, the mixing circuit 33 is (a) one of the earphone audio signal terminals EP-L and EP-R of the analog audio connector 31 (here, it is the terminal EP-L, but it may be the terminal EP-R). Are electrically connected to both the earphone audio signal terminals EP-L and EP-R of the analog audio connector 32, and (b) the microphone audio signal terminal MIC of the analog audio connector 31 and the microphone audio signal terminal of the analog audio connector 32. MIC is electrically connected, (c) the ground terminal GND of the analog audio connector 31 is electrically connected to the ground terminal GND of the analog audio connector 32, and (d) the earphone audio signal terminal EP of the analog audio connector 31 is connected. -L, provided between the other of EP-R (here, terminal EP-R) and ground terminal GND The voltage dividing terminal of the voltage divider, electrically connected to the microphone audio signal terminal MIC.

  This voltage dividing circuit is composed of resistance elements R1 and R3, and one end and the other end of the series circuit of the resistance elements R1 and R3 are the other of the earphone audio signal terminals EP-L and EP-R of the analog audio connector 31. (Here, the terminal EP-R) and the ground terminal GND are connected, and one end of the resistor element R2 is connected to a connection point (that is, a voltage dividing terminal) between the resistor element R1 and the resistor element R3. The end is electrically connected to the microphone audio signal terminal MIC. That is, the voltage dividing terminal is electrically connected to the microphone audio signal terminal MIC via the resistance element R2. Here, the damping ratio (R3 / (R1 + R3)) of the voltage dividing circuit is set to any value in the range of 100 to 1/200, for example.

  Thus, in this embodiment, the mixing circuit 33 is composed only of passive elements that do not require a power source. That is, the mixing circuit 33 does not include active elements such as transistors and operational amplifiers, and it is not necessary to supply power from the smartphone 1 or the voice interface 2.

  In this embodiment, the output impedance of the microphone 22 of the audio interface 2 is any value within a predetermined allowable range, and the value of the output impedance of the mixing circuit 33 (that is, R2 + R3) is within the allowable range. It is set to a value closer to the upper limit value than the lower limit value. That is, the values of the resistance elements R1, R2, and R3 are set according to the output impedance of the microphone 22.

  For example, when the output impedance of the microphone 22 is set to any value within an allowable range from 100 ohms to 2.2 kilohms, the output impedance of the mixing circuit 33 is 1.15 kiloohms or more. For example, the output impedance of the mixing circuit 33 may be substantially the same as the output impedance of the microphone 22.

  Further, the value of the output impedance of the mixing circuit 33 is set to be equal to or lower than the input impedance of the audio input circuit 15.

  Next, the operation of the call recording system according to Embodiment 1 will be described.

  When recording a call on the smartphone 1, first, the call recording adapter 3 is connected to the smartphone 1, and the voice interface 2 is connected to the call recording adapter 3.

  Then, the call processing unit 12a starts a call with a call partner desired by the user in accordance with a user operation on the smartphone 1. The voice uttered by the user of the smartphone 1 is collected by the microphone 22 of the voice interface 2, and the other party's voice is emitted from the earphones 21 </ b> L and 21 </ b> R of the voice interface 2 to the user of the smartphone 1. When the call is started, the call processing unit 12 a transmits the audio data of the analog audio signal received by the audio input circuit 15 by the wireless communication device 11 and the earphone audio corresponding to the audio data received by the wireless communication device 11. The signal is output from the audio output circuit 14.

  The call recording adapter 3 supplies the earphone audio signal (analog audio signal of the other party of the call) output from the smartphone 1 to the audio interface 2 and attenuates the earphone audio signal to indicate the audio of the user of the smartphone 1. The microphone sound signal mixed with the signal and mixed with the attenuated earphone sound signal is output to the smartphone 1.

  Therefore, the analog voice signal received by the voice input circuit 15 of the smartphone 1 is mixed with the analog voice signal indicating the voice of the user of the smartphone 1 and the analog voice signal indicating the voice of the other party.

  During a call, the recording processing unit 12 b acquires the audio data of the analog audio signal received by the audio input circuit 15 and stores it in the storage device 13.

  Therefore, the voice of the user of the smartphone 1 and the voice of the other party are recorded as voice data of one channel.

  Note that the call processing unit 12a includes an echo canceller such as an adaptive filter, and based on the received voice of the other party, the other party of the analog voice signal received by the voice input circuit 15 of the smartphone 1 is an echo canceller. Voice data with the voice component of the other party being attenuated and the other party's voice component attenuated by the echo canceller is transmitted to the other party. Note that since the echo canceller is not applied to the recorded voice data, the voices of both the user and the other party are recorded.

  As described above, according to the first embodiment, the smartphone 1 is a call device that can make a call by software processing but cannot record the voice of the other party, and the call recording adapter 3 is connected to the smartphone 1. The audio interface 2 is connected to the smartphone 1 and the audio interface 2 respectively. The call recording adapter 3 attenuates the earphone audio signal output from the smartphone 1 and mixes the attenuated earphone audio signal with the microphone audio signal supplied from the microphone 22 of the audio interface 2 to the call device. And the smart phone 1 records the microphone audio | voice signal with which the earphone audio | voice signal after attenuation | damping was mixed as digital data by software processing.

  Thereby, since the voice signal of the other party's voice output from the smartphone 1 is mixed with the voice signal of the voice of the user of the smartphone 1, the user of the smartphone 1 can simply record the voice received by the microphone input. Both voice and the other party's voice are recorded. In this way, in the smartphone 1 that can make a call by software processing but cannot record the voice of the other party, the voice of the other party can be recorded together with the voice of the local station.

Embodiment 2. FIG.

  FIG. 5 is a circuit diagram showing a configuration of the call recording adapter according to the second embodiment. In the second embodiment, the mixing circuit 33 a is used instead of the mixing circuit 33.

  In the second embodiment, as shown in FIG. 5, the mixing circuit 33a includes (a) the earphone audio signal terminals EP-L and EP-R, the microphone audio signal terminal MIC, and the ground terminal GND of the analog audio connector 31. The earphone audio signal terminals EP-L and EP-R of the analog audio connector 32 are electrically connected to the microphone audio signal terminal MIC and the ground terminal GND, respectively. (B) the earphone audio signal terminal EP-L of the analog audio connector 31 , EP-R and the ground terminal GND, the voltage dividing terminal of the two-input voltage dividing circuit is electrically connected to the microphone audio signal terminal MIC.

  This voltage dividing circuit is composed of resistance elements R1L, R1R, R3, and one end and the other end of the series circuit of the resistance elements R1L, R3 are the earphone audio signal terminal EP-L of the analog audio connector 31 and the ground terminal GND. And one end and the other end of the series circuit of the resistance elements R1R and R3 are respectively connected to the earphone audio signal terminal EP-R and the ground terminal GND of the analog audio connector 31 and electrically connected to the microphone audio signal terminal MIC. Connected. That is, the voltage dividing terminal is electrically connected to the microphone audio signal terminal MIC via the resistance element R2.

  Since the other configuration and operation of the call recording system according to the second embodiment are the same as those of the first embodiment, description thereof is omitted.

  Various changes and modifications to the above-described embodiment will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the subject matter and without diminishing its intended advantages. That is, such changes and modifications are intended to be included within the scope of the claims.

  For example, in the first and second embodiments, some or all of the resistance elements R1, R1L, R1R, R2, and R3 may be variable resistors.

  In the first and second embodiments, other passive elements may be connected in series or in parallel to the resistance elements R1, R1L, R1R, R2, and R3.

  Furthermore, in the mixing circuits 33 and 33a of the first and second embodiments, the resistance element R2 may be eliminated, and the voltage dividing terminal may be directly connected to the microphone audio signal terminal MIC. Further, the above-described voltage dividing circuit is not limited to the above-described circuit configuration.

  In the first and second embodiments, the analog audio connectors 23 and 31 are 4-pole plugs (for example, mini plugs having a diameter of 3.5 mm, 2.5 mm, etc.), and the analog audio connectors 16 and 32 are 4-pole plugs. (For example, a mini jack having a diameter of 3.5 mm, 2.5 mm, etc.), but other types of connectors (for example, a 5-pole plug and jack) may be used. In that case, when stereo microphone input is possible, such as a 5-pole plug and jack, for example, one or both of stereo (ie, two on the left and right) microphone audio signal terminals are connected to the above-described microphone audio signal terminals. What is necessary is just to use as MIC.

  The present invention can be applied to, for example, recording of business calls such as telephone sales.

1 Smartphone (an example of a telephone device)
2 Voice interface 3 Call recording adapter 12b Recording processor 14 Voice output circuit 15 Voice input circuit 21L, 21R Earphone 22 Microphone 33, 33a Mixing circuit

Claims (5)

A telephone device that can talk by software processing but cannot record the voice of the other party,
An audio interface with a microphone and earphones;
A call recording adapter connected between the call device and the voice interface between the call device and the voice interface;
The call device includes a voice input circuit that receives a microphone voice signal from the outside, a voice output circuit that outputs an earphone voice signal to the outside, and a recording processing unit that records voice based on the microphone voice signal as digital data by software processing And
The call recording adapter attenuates the earphone audio signal output from the call device, and mixes the attenuated earphone audio signal with a microphone audio signal supplied from the microphone of the audio interface to the call device. With a mixing circuit,
The recording processing unit of the call device records the microphone audio signal mixed with the attenuated earphone audio signal as digital data by software processing;
Call recording system characterized by.   2. The call recording system according to claim 1, wherein the mixing circuit comprises only passive elements that do not require a power source. The output impedance of the microphone of the voice interface is any value within a predetermined tolerance range,
The output impedance of the mixing circuit is set to a value closer to the upper limit than the lower limit of the allowable range;
The call recording system according to claim 2.   The communication device is a smartphone equipped with Android OS, and in the Android OS, recording of a microphone input from an audio source is possible, but recording of a voice call from an audio source is not possible. The call recording system according to any one of claims 1 to 3, wherein: Calls connected to the call device and the voice interface, respectively, between a call device that can make a call by software processing but cannot record the voice of the other party, and a voice interface having a microphone and an earphone A recording adapter,
A mixing circuit for attenuating an earphone audio signal output from the communication device and mixing the attenuated earphone audio signal with a microphone audio signal supplied from the microphone of the audio interface to the communication device;
The mixing circuit is composed only of passive elements that do not require a power source,
The value of the passive element of the mixing circuit is set according to the output impedance of the microphone of the voice interface;
Call recording adapter characterized by.

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