JP2009077139A - Call recorder of telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a call recorder of a telephone set, which is capable of satisfactorily recording telephone calls in both transmission and reception irrespective of peripheral sounds input by a transmission part even when the telephone set is connected to a digital line. <P>SOLUTION: Effective sound signals of a call transmission part 3 and a call reception part 4 are detected by a sound sensing part 19. Sound signals of the call transmission part 3 and the call reception part 4 which are sent to the sound sensing part 19 are attenuated by an attenuator. An attenuation amount switch 18 is operated so as to send the sound signals to the sound sensing part 19 while switching an attenuation amount. A control part 10 causes the attenuation amount switch 18 to switch the attenuation amount so as to reduce the attenuation amount of sound signals and starts recording a telephone call when the sound sensing part 19 detects the effective sound signal of the transmission par 3 or the reception part 4, and the control part 10 causes the attenuation amount switch 18 to switch the attenuation amount so as to increase the attenuation amount of sound signals and starts recording a telephone call when a state where the level of sound signals is equal to or lower than a prescribed level continues for a prescribed time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a telephone call recording apparatus, and more particularly to a telephone call recording apparatus suitable for recording a telephone call connected to a digital line such as an ISDN or IP telephone.

  2. Description of the Related Art Conventionally, a call recording device that records a call when making a call using a telephone is known from Patent Document 1 below.

This type of call recording device usually has an automatic recording function, is used by being connected to a telephone, and when a telephone call is started on the telephone, the voice of the transmitter and / or receiver of the telephone handset is used. When the signal level is detected and the audio signal level becomes equal to or higher than a predetermined level, the recording is started. When the audio signal level decreases below the predetermined level, the recording is stopped.
JP-A-8-289003

  In a conventional call recording device that performs this type of automatic recording, the level of the audio signal output from the handset's transmitter is detected, and when the audio signal level of the transmitter exceeds a predetermined level, the call is recorded. However, when the transmitter (microphone) collects sounds around the phone and the audio signal level exceeds the specified level, call recording is started even though the call is not actually started. There was a risk of malfunction.

  On the other hand, in an analog telephone connected to a conventional analog telephone line, the sound signal collected from the transmitter section circulates as a side sound to the receiver section, and the voice signal from the transmitter section is mixed into the receiver section. It is known to occur.

  For this reason, in the conventional telephone call recording device, only the audio signal sent to the receiver (receiver) is taken into consideration that the audio signal of the transmission is superimposed on the received audio signal output from the receiver. When the audio signal level rises, automatic recording of a call is started, and automatic recording stops when the audio signal level decreases. As a result, the trouble of starting the call recording even though the transmitter of the telephone does not start the call by picking up surrounding sounds is eliminated.

  However, in telephones connected to digital lines such as ISDN and IP telephones, particularly digital telephones, the voice signals for transmission and reception are transmitted separately and processed separately in the digital telephone. The voice signal of the part does not wrap around the receiver as a side sound. For this reason, even if the above-mentioned call recording device is connected to the telephone and used, the level of only the audio signal sent to the receiver (receiver) is detected and automatic recording of the call is started, the receiver However, since the voice signal from the transmitter is not superimposed, there is a problem that the voice signal of the transmitted voice cannot be recorded.

  The present invention solves the above-described problems, and even a telephone connected to a digital line can record both outgoing and incoming calls satisfactorily regardless of the surrounding sound input by the transmitter. It is an object of the present invention to provide a telephone call recording device that can be used.

  A telephone call recording apparatus according to the present invention includes a recording medium for recording voice signals of a transmitter and a receiver of a telephone as a digital signal, and a control unit for controlling call recording on the recording medium. A call recording device connected to a connection between a handset and a telephone body and automatically recording a voice of a call, a voice sensing means for detecting a valid voice signal of the transmitter and the receiver, and the voice sensing Attenuating means for attenuating the speech signals of the transmitting section and the receiving section sent to the means, and attenuation amount switching means for switching the attenuation amount of the attenuating means and sending the speech signal to the speech sensing means. When the voice sensing means detects a valid voice signal from the transmitting section or the receiving section, the control section switches the attenuation amount switching means to a side for reducing the attenuation amount of the voice signal and records the call. The level of the audio signal There predetermined level following conditions when a predetermined time has elapsed, the attenuation amount switching means, characterized in that the stop call recording is switched to the side to increase the attenuation of the attenuation means.

  Here, the attenuating means includes a first attenuator for transmission that greatly attenuates the audio signal of the transmitter, a first attenuator for reception that attenuates the audio signal of the receiver to a medium level, and the transmitter. A second attenuator for transmission that slightly attenuates the voice signal of the speech section, and the attenuation amount switching means is connected to the input side of the voice sensing means for the first attenuator for transmission and the second attenuator. It can be configured to switch between the mixed output side of the first attenuator, the second attenuator for transmission, and the mixed output side of the receiver.

  In addition, when the attenuation amount switching means switches to the side where the attenuation amount of the attenuation means is increased, the attenuation portion of the attenuation means is such that the receiving unit does not input a surrounding sound other than a call and does not produce a valid audio signal. The attenuation can be set large.

  The audio signals of the transmitter and receiver are amplified by amplifiers, mixed by a mixer, sampled, quantized, encoded and converted into digital signals, and controlled by the control unit. It can be configured to record on the recording medium.

  According to the call recording apparatus having the above-described configuration, even a telephone connected to a digital line can automatically record calls of both the transmitter and receiver. Further, in the call recording standby state, the attenuation amount switching means is switched to the side of increasing the attenuation amount of the attenuation means. Is not started, and the problem of recording sounds other than calls can be solved.

  Also, when the voice sensing means detects a valid voice signal of the transmitter or receiver, for example, when calling, the voice signal of the other party's ringing tone is input to the receiver, and when this is detected by the voice sensing means, the sound is attenuated. Since the volume switching means switches to the side of decreasing the attenuation amount of the audio signal and starts recording the call, the call can be recorded reliably when the call is started.

  Further, when a predetermined time elapses in the absence of an effective level audio signal, the attenuation amount switching means switches to the side of increasing the attenuation amount of the attenuation means and stops the call recording. It can be efficiently stored in a storage medium such as a semiconductor memory or HDD.

  Furthermore, the attenuating means includes a first attenuator for transmission that greatly attenuates the audio signal of the transmitter, a first attenuator for reception that attenuates the audio signal of the receiver to a medium level, and a voice of the transmitter. A second attenuator for transmission that slightly attenuates the signal, and the attenuation amount switching means has a mixed output of the first attenuator for transmission and the first attenuator for reception on the input side of the voice sensing means. And the second attenuator for transmission and the mixed output side of the receiver unit, the voice signal of the transmitter unit where the speaker's voice is likely to be input at a high level is attenuated by a large attenuation amount. Since the voice signal of the receiver that receives the voice of the other party and is easy to receive a low-sound level audio signal is attenuated by a moderate amount of attenuation, it prevents both malfunctions due to ambient noise, etc. It can be recorded reliably.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of a telephone call recording device. The call recording apparatus 1 is used by being connected to a modular jack 31 for handset connection between the handset 2 of the telephone 30 and the telephone body, and constitutes a recording apparatus for recording telephone calls.

  The call recording device 1 includes a recording medium 29 that records the audio signals of the transmitting unit 3 and the receiving unit 4 of the handset 2 as digital signals, a control unit 10 that controls call recording on the recording medium 29, and a call recording. Is provided with a voice sensing unit 19 for detecting a voice signal of an effective level of the transmitter 3 and the receiver 4, and when there is no voice signal valid for a certain period of time, recording is stopped as a standby state. The voice of the call is automatically recorded.

  The control unit 10 and the voice sensing unit 19 are constituted by a so-called microcomputer, a CPU for controlling call recording based on program data for recording processing stored in advance in a ROM, and temporarily storing data to constitute a work area of the CPU. A RAM and an input / output circuit for inputting / outputting data signals are provided. The voice sensing unit 19 transmits the voice signals of the transmitter 3 and receiver 4 of the handset 2 to the first attenuator 11 for transmission, the first attenuator 12 for reception, the second attenuator 13 for transmission, and the mixer. 15 and 16 and the attenuation level switch 18, and when an effective level audio signal (audio signal of a predetermined voltage level or higher) is input, it is sent to the control unit 10 as a call recording start signal. Composed.

  When the control unit 10 enters a call recording standby state, the control unit 10 greatly attenuates the audio signal of the transmission unit 3, attenuates the audio signal of the reception unit 4 to a moderate level and inputs it to the audio detection unit 19. The amount switcher 18 is switched to stand by. At this time, the attenuator used is a large attenuation attenuator 7 with a large attenuation, and the large attenuation attenuator 7 is composed of a first attenuator 11 for transmission and a first attenuator 12 for reception. The input side of the first transmitting attenuator 11 is connected to the transmitting unit 3 through the amplifier 5, and the input side of the first receiving attenuator 12 is connected to the receiving unit 4 through the amplifier 6.

  The first attenuator 11 for transmission is set to have a large attenuation amount so as to greatly attenuate the audio signal of the transmission unit 3, and the first attenuator 12 for reception receives the audio signal of the reception unit 4 to a medium level. In order to attenuate, it is set to be a moderate amount of attenuation. That is, since the sound around the handset 2 is easily input to the transmitter 3, the sound signal of these external sounds is attenuated relatively greatly during standby, and the sensitivity of the sound detector 19 is virtually lowered. This prevents malfunctions caused by ambient sounds.

  On the other hand, since only the voice signal of the call from the other party is input to the receiver 4, the attenuation of the first attenuator 12 for reception is smaller than the attenuation of the first attenuator 11 for transmission. Set to attenuation. Of course, the amount of attenuation during standby is set to be larger than the amount of attenuation during call recording to be described later.

  The first attenuator 11 for transmission, the first attenuator 12 for reception, and the second attenuator 13 for transmission, which will be described later, can basically be composed of resistors. The resistance value of the device 11 is set to be larger than the resistance value of the first attenuator 12 for receiving. The output side of the first attenuator 11 for transmission and the first attenuator 12 for reception is connected to the mixer 15, and the voice signals of the transmission unit 3 and the reception unit 4 are amplified and then the first attenuator 11 for transmission. The first attenuator 12 for reception is attenuated and mixed, and is sent to an attenuation amount switch 18 for switching the attenuation amount.

  On the other hand, when the voice sensing unit 19 detects a voice signal of an effective level and starts actual call recording, the control unit 10 reduces the attenuation amount of the voice signal of the transmitting unit 3 and the voice signal of the receiving unit 4. The attenuation is set to zero and control is performed so that the audio signal is input to the audio sensing unit 19 without being attenuated. That is, at the start of call recording, the control unit 10 switches the attenuation amount switch 18 so as to increase the detection sensitivity of the voice detection unit 19 and starts the call recording process. At this time, the attenuator used is a small attenuation attenuator 8 with a small attenuation, and the small attenuation attenuator 8 is a second attenuator for transmission 13 and a voice signal circuit (resistance) with zero attenuation. A signal transmission circuit having no). The input side of the second attenuator 13 for transmission is connected to the transmitter 3 via the amplifier 5, and the voice signal circuit with zero attenuation is connected to the receiver 4 via the amplifier 6.

  Of course, the resistance value of the second attenuator 13 for transmission is set to be larger than the resistance value of the voice signal circuit with zero attenuation for reception. The output side of the second transmitting attenuator 13 and the voice signal circuit for receiving zero attenuation is connected to the mixer 16, and the voice signals of the transmitting unit 3 and the receiving unit 4 are amplified and then transmitted to the second transmitting unit. The signal is attenuated by the attenuator 13, mixed by the mixer 16, and sent to the attenuation amount switch 18 that switches the attenuation amount.

  The attenuation switch 18 switches the circuit through the large attenuation attenuator 7 and the circuit through the small attenuation attenuator 8 under the control of the control unit 10 so as to send an audio signal to the audio sensing unit 19. Configured. The attenuation switcher 18 switches so as to sense a signal through the large attenuation attenuator 7 in a standby state for recording a call, greatly attenuates the voice signal on the transmitter 3 side, The sound is attenuated moderately, and operates so as to prevent malfunction due to noise such as sounds around the handset 2.

  On the other hand, when a valid voice signal is detected and recording is started, the attenuation amount switcher 18 is switched to a circuit through the small attenuation amount attenuator 8 to reduce the attenuation amount of the voice signal on the transmission unit 3 side. Then, the attenuation of the audio signal of the receiver 4 is set to zero, the signal sensitivity is increased, and the audio signal is sent to the audio detector 19. The voice sensing unit 19 operates to send a signal for starting call recording to the control unit 10 when a voice signal of a preset effective level or higher is input during standby for call recording.

  When waiting for call recording, the controller 10 switches the attenuation switch 18 to the large attenuation attenuator 7 side, and greatly attenuates the voice signal of the transmitter 3 by passing it through the first attenuator 11 for transmission. The voice signal of the receiver 4 is passed through the receiver first attenuator 12 so that the voice signal is attenuated moderately and the sensitivity of the voice detector 19 is lowered. Further, at the start of call recording, the control unit 10 switches the attenuation switch 18 to the small attenuation attenuator 8 side and passes the voice signal of the transmitter 3 through the second attenuator 13 for transmission. The sound signal is attenuated to zero, and the sound signal is attenuated to zero by passing the sound signal of the reception unit 4 through a circuit with zero attenuation.

  Further, the control unit 10 receives the above-mentioned voice signal of an effective level or more when the call recording standby state is input, and when the signal for starting the call recording is transmitted from the voice detection unit 19, As described above, the voice signal is passed through the small attenuation attenuator 8 to increase the sensitivity of the voice sensing unit 19, and the A / D converter 28 and the recording medium 29 are operated to start recording a call. It has become.

  As the recording medium 29, for example, a flash memory composed of a small EEPROM is used, and the audio signals of the transmitter 3 and the receiver 4 are converted into digital signals by the A / D converter 28 and recorded on the recording medium 29. It has come to be. The audio signals of the transmitter 3 and receiver 4 are amplified through the amplifiers 5 and 6, respectively, mixed by the mixer 27, and input to the A / D converter 28. The A / D converter 28 samples the audio signal input through the low-pass filter by sampling at a predetermined sampling frequency. The sampled signal is quantized, and the value of each quantized signal is captured in binary number, encoded, and recorded on the recording medium 29 as a digital signal. Such a conversion operation of the A / D converter 28 and a recording operation on the recording medium 29 are controlled by the control unit 10.

  Furthermore, a D / A converter 21 is connected to the recording medium 29 in order to read out and reproduce the recorded audio data, and an audio signal converted into an analog signal is connected to the output side of the D / A converter 21. Is connected to the amplifier 23, and the amplified audio signal is sent to the speaker 23 so that the read call sound is reproduced from the speaker 23.

  Next, the operation of the call recording apparatus having the above configuration will be described with reference to the flowchart of FIG. When recording a call on the telephone 30 using the call recording apparatus 1, first, the modular plug is removed from the handset 2 of the telephone 30, and the modular cable of the call recording apparatus 1 is connected to the modular jack (connection port) of the handset 2. 32 is connected.

  The modular cable for the handset of the telephone 30 is connected to the second modular jack (connection port connected to the modular cable 32 inside) on the call recording device 1 side.

  When a recording switch (not shown) of the call recording device 1 is turned on, the control unit 10 first controls the attenuation amount switcher 18 to switch to the large attenuation amount attenuator 7 side at step 100 to enter a recording standby state.

  As a result, as shown in FIG. 1, the input side of the voice sensing unit 19 is connected to the large attenuation attenuator 7 side, and the voice signal of the transmission unit 3 passes through the amplifier 5 and has a large attenuation. The sound signal is greatly attenuated through the 1 attenuator 11, the sound signal of the receiver 4 is attenuated through the amplifier 6, and the sound signal is attenuated moderately through the first attenuator 12 for reception with a moderate attenuation amount. The state is input to the unit 19. That is, the sensing sensitivity of the voice sensing unit 19 is lowered to enter a call recording standby state.

  For this reason, in the recording standby state, the first attenuator 11 for transmission having a large attenuation amount enters the circuit for inputting the audio signal of the transmitter 3, so that the transmitter 3 of the handset 2 has a surrounding area. Even when the noise is collected, recording is not started, and malfunction due to surrounding sounds can be prevented.

  In addition, since the audio signal of the receiver 4 also attenuates the audio signal through the first attenuator 12 having a medium attenuation, the receiver of the receiver 4 receives ambient noise. It functions as a low-sensitivity microphone and can also prevent malfunction when a sound signal due to noise or the like is input.

  In such a call recording standby state, for example, when a call from the telephone 30 is made, the other party's ringing tone is generated, and when the voice signal is input to the receiver 4, the voice signal is amplified by the amplifier 6, The sound is input to the voice sensing unit 19 through the first attenuator 12 for reception. The other party ringing tone is input to the voice sensing unit 19 as a voice signal having an effective level, so that a detection signal is sent to the control unit 10.

  Further, when a call is received from the other party's telephone, the voice from the other party's telephone is input to the receiver 4. When the voice signal is input to the receiver 4, the voice signal is similarly amplified by the amplifier 6, passed through the first attenuator 12 for reception, and input to the voice detector 19. Similarly, the audio signal is input as an effective level signal to the audio sensing unit 19, and a detection signal is sent to the control unit 10.

  When the control unit 10 receives the detection signal from the voice sensing unit 19, the process proceeds from step 110 to step 120, outputs an operation control signal to the recording medium 29 and the A / D converter 28, and starts recording. In step 130, the control unit 10 outputs a switching signal to the attenuation amount switcher 18 to switch the attenuation amount switcher 18 to the small attenuation amount attenuator 8 side.

  As a result, the voice signal of the transmitter 3 is slightly attenuated with a small amount of attenuation through the second attenuator 13 for transmission, and the voice signal of the receiver 4 is transmitted through the transmission line with zero attenuation, thereby reducing the signal. The attenuation is set to zero and is input to the voice sensing unit 19 to increase the sensitivity of the voice sensing unit 19. Call recording is continued in a state in which the sensitivity of the voice sensing unit 19 is increased.

  At the time of call recording, the audio signals of the transmitter 3 and receiver 4 are amplified by the amplifiers 5 and 6, mixed by the mixer 27, and then sent to the A / D converter 28. In the A / D converter 28, an audio signal is input through a low-pass filter, and is sampled by sampling at a predetermined sampling frequency. The sampled signal is quantized at the level of each signal, and the value of each quantized signal is captured in binary, encoded, and recorded as a digital signal on a recording medium 29 such as an EEPROM.

  In such a call recording state, the voice sensing unit 19 sends a detection signal to the control unit 10 while an effective level voice signal is input through the small attenuation attenuator 8 and the attenuation switch 18. .

  However, when the call of the telephone 30 is interrupted or terminated and an effective level audio signal is no longer input to the audio sensing unit 19, transmission of the detection signal from the audio sensing unit 19 to the control unit 10 is interrupted. When the interruption of the detection signal continues for a predetermined time or longer, the process proceeds from step 140 to step 150, where the control unit 10 outputs a switching signal to the attenuation amount switcher 18, and the attenuation amount switcher 18 is connected to the large attenuation amount attenuator 7 side. Control to switch to. In step 160, recording is stopped.

  As a result, the input side of the voice sensing unit 19 is switched to the large attenuation attenuator 7 side, and the voice signal of the transmission unit 3 passes through the amplifier 5 and passes through the first attenuator 11 for transmission with a large attenuation. A state in which the sound signal of the receiving unit 4 is attenuated to a large extent, passes through the amplifier 6 and the first attenuation attenuator 12 having a medium attenuation amount, and is attenuated to a middle level and is input to the sound detecting unit 19. It becomes. That is, the sensitivity of the voice sensing unit 19 is lowered and the recording standby state is restored.

  In this way, in the standby state for recording a call, the attenuation switch 18 switches to the large attenuation attenuator 7 that greatly attenuates the audio signal. However, the problem of recording the sound other than the call can be solved.

  In addition, the voice sensing unit 19 detects a voice signal at an effective level of the transmitting unit 3 and the receiving unit 4, and, for example, a voice signal of the other party's ringing tone is input to the receiving unit 4 at the time of outgoing call. When detected, the attenuation amount switch 18 switches to the side of decreasing the attenuation amount of the audio signal and starts recording the call, so that it is possible to reliably record both the transmission and reception calls.

  Further, when a predetermined time elapses in the absence of an effective level audio signal, the attenuation amount switch 18 switches to the side of increasing the attenuation amount of the audio signal and stops call recording, so only the audio signal having an effective level is called. Can be recorded on the recording medium 29 efficiently.

  In addition, the voice signal of the transmitter 3 where the voice of the speaker of the telephone 30 is likely to be input at a high level is attenuated by a large attenuation amount. Since the audio signal is attenuated by a moderate attenuation, both incoming and outgoing voices can be recorded to the same extent and reliably.

  The call recording device of the present invention is not limited to the above embodiment, and can be implemented in the following forms. For example, the recording medium 29 can be a semiconductor memory other than an EEPROM, an HDD, or the like. Further, as the telephone 30, a conventional analog telephone can be used in addition to a digital telephone.

1 is a block diagram of a call recording apparatus showing an embodiment of the present invention. It is a flowchart which shows the operation | movement of call recording.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Call recording apparatus 2 Handset 3 Transmission part 4 Reception part 7 Large attenuation attenuator 8 Small attenuation attenuator 10 Control part 11 First attenuator for transmission 12 First attenuator for reception 13 Second attenuation for transmission 18 Attenuation switch 19 Voice sensing unit 29 Recording medium 30 Telephone

Claims (4)

A recording medium for recording the voice signal of the transmitter and receiver of the telephone as a digital signal, and a controller for controlling call recording on the recording medium, connected to a connection between the telephone handset and the telephone body A call recording device that automatically records the voice of a call,
Voice sensing means for detecting valid voice signals of the transmitter and receiver;
Attenuating means for attenuating the audio signals of the transmitting unit and the receiving unit sent to the audio sensing unit;
Attenuation amount switching means for switching the attenuation amount of the attenuation means and sending the audio signal to the audio sensing means,
And the control unit switches the attenuation amount switching means to a side for reducing the attenuation amount of the audio signal when the audio sensing unit detects a valid audio signal of the transmitting unit or the receiving unit. Call recording is started, and when a state where the level of the audio signal is equal to or lower than a predetermined level has elapsed for a predetermined time, the attenuation amount switching means switches to the side of increasing the attenuation amount of the attenuation means to stop the call recording. A telephone telephone call recording device.   The attenuating means includes: a first attenuator for transmission that greatly attenuates a voice signal of the transmitter; a first attenuator for reception that attenuates the voice signal of the receiver to a medium level; A second attenuator for transmission for slightly attenuating the audio signal, and the attenuation amount switching means includes a first attenuator for transmission and a first attenuation for reception on the input side of the voice sensing means. 2. The telephone call recording apparatus according to claim 1, wherein switching is performed among the mixed output side of the receiver, the second attenuator for transmission, and the mixed output side of the receiver.   When the attenuation amount switching means switches to the side of increasing the attenuation amount of the attenuation means, the attenuation amount of the attenuation means is such that the receiving unit does not input ambient sounds other than a call and make an effective voice signal. The telephone call recording device according to claim 1, wherein the telephone call recording apparatus is set large. The voice signals of the transmitter and receiver are amplified by amplifiers, mixed by a mixer, sampled, quantized, encoded, converted into digital signals, and controlled by the control unit. 4. The telephone call recording device according to claim 1, wherein the telephone call recording device is recorded on the recording medium.

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