JP2005051606A - Telephone call information management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telephone call information management system that makes it possible to retroact to the time when the telephone call was performed and has high-level evidence. <P>SOLUTION: A time delivery engine 20 inspects the internal clock 51 of a telephone call management 50 and ID (identification) information. In the telephone call management 50, an encoder 52 encodes the present time information of the internal clock 51 and a signal production 53 produces time code signals and ID signals. In an input circuit 40, audio signals from a telephone 11 and various signals of the signal generator 53 are synthesized. The signals synthesized are quantized in an A/D converter 43 to be stored and recorded in a recorder 54 of the telephone call management 50, while in a filter 55, the combined signals are separated into low-pass signals and high-pass signals, so that both the signals are extracted. The high-pass signals are reproduced in a decoder 58, while the signals reproduced are combined in an audio synthesizer 59 to be supplied to a display unit 63, on which the time information on the time at normal recording and on the time at reproducing the time is displayed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a call record management apparatus, and more particularly to a call information management apparatus that attaches a time stamp to a digital record of a telephone call.

Currently, call information management apparatuses that are built in the telephone itself as a function of the telephone or that digitally record, store, and reproduce call contents by connecting to the telephone have become widespread. For example, in the “voice information management apparatus” described in Patent Document 1, a voice call by a telephone or a radio is recorded with a call start time and an end time attached, and “voice information management” manages the recorded call information. "Management device" has been proposed. When recording the content of a call using this device, based on the time information derived from the time information of its own internal clock, record the call recording start time and completion time together with the call content data, The time information is used as management information.
JP 2002-278576 A

  However, when trying to adopt the call contents recorded with this device as evidence, since the time information is not recorded at all in the continuous call record part, the recorded contents are extracted partially. If the information is re-recorded in another device, the time information is lost, and the time when the call was made cannot be traced back.

  Also, if the recorded data is tampered with, such as adding or deleting the recorded data, finding that part is a very difficult task, so it is claimed that it is a valid call record However, it cannot be said that the evidence is high. Furthermore, since the time information is derived from the telephone or the internal clock of the call information management device, there is a possibility that the clock has been set in advance at a time convenient for the owner. Sex had a question that was questioned.

  Accordingly, an object of the present invention is to provide a call information management device with high evidence that enables the time when a call is made to be traced back.

(1) In order to achieve the above object, the call information management device according to claim 1 of the present invention is a call information which records a call content digitally by being built in or connected to a telephone automatically or by a user operation. A management device comprising a time distribution organization that defines an accurate time, a call management unit that manages call information, an input circuit unit that receives an output signal of the call management unit and a voice signal from the telephone, and An internal clock for defining the call time; a quantization means for quantizing the call voice signal and a signal accompanying the call time signal; and a signal for generating a predetermined signal based on the signal quantized by the quantization means Generating means, recording means for storing and storing digitized signals that can be built into the call management unit or attached to the outside, and signal reproduction means for reproducing the recorded digital data as sound, A synthesized signal obtained by continuously or discretely superimposing an arbitrary signal generated by the signal generating means on the voice signal of the recorded call is quantized by the quantizing means, and recorded and stored as digital data in the recording means. Thereafter, the recorded and stored data is reproduced by the signal reproduction means via the filtering means.

(2) The call information management device according to claim 2 is characterized in that the sampling frequency in the quantizing means is a sampling frequency higher than twice the upper limit frequency of the pass band by the band-pass filter of the telephone.

(3) The call information management device according to claim 3, wherein the signal generating unit is independent in a frequency band higher than an upper limit frequency of a pass band by a band pass filter of the telephone and lower than half of the sampling frequency. Alternatively, a signal having a plurality of frequencies is generated.

(4) In the call information management device according to claim 4, the filtering means includes a low pass filter that cuts off a frequency higher than the threshold, with an upper limit frequency of a pass band by a band pass filter of the telephone as a threshold, and a frequency lower than the threshold. It is characterized by comprising a high-pass filter for blocking.

(5) The call information management device according to claim 5 uses an end code calculation unit in which the predetermined signal generated by the signal generation unit encodes time information of an internal clock mounted on the call management unit. A signal obtained by encoding current time information indicated by the internal clock.

(6) The call information management device according to claim 6 is characterized in that the predetermined signal generated by the signal generation means is a pulse-like signal that an internal clock mounted in the call management unit advances. To do.

(7) In the call information management device according to claim 7, the ID signal of the call information management device in which the predetermined signal generated by the signal generation means is configured by a combination of frequencies determined for each call information management device. It is characterized by being.

(8) The call information management device according to claim 8 uses the encoding calculation means for continuing the recording for a certain time after the call recording is completed and encoding the current time information of the internal clock mounted on the call information management apparatus. A signal transmitted by encoding the completion time is quantized at the sampling frequency and added to the end of the recorded data and recorded.

(9) The call information management device according to claim 9 extracts the code of the time information encoded and recorded by the high pal filter, and uses the encoded time information as the time information via the decoding calculation means. , Display, or conversion into speech by speech synthesis.

(10) The call information management device according to claim 10 is characterized in that a coded and recorded voice signal is extracted by the low-pass filter and reproduced as voice through the signal reproduction means.

(11) The call information management device according to claim 11, wherein the internal clock is directly communicated via a network with a time distribution organization that generates and distributes accurate and fair time information, or an information terminal connected to the network. The time calibration processing of the internal clock can be performed only by indirect communication via the.

  According to the present invention comprising the means described in (1) to (11) above, sampling for digitally sampling and recording call data in a call information management apparatus for recording call contents by connecting to a telephone. The frequency is higher than twice the maximum frequency of the bandpass filter in the telephone.

  The call information management device has an internal clock, and transmits a pulse signal group that encodes information of the recording start time derived from the internal clock at the start and end times of call recording and at an appropriate time during the call. At this point, a pulse signal synchronized with the progress of the internal clock is transmitted as a timing marker for complementing the time information, and the transmitted signal is added to the call voice signal. In addition, in order to specify the recorded call information management device, the ID signal of the recording device can be generated by combining a single frequency or a plurality of frequencies that are not used as pulse signals, and can be transmitted continuously over the call signal from the start to the end of the call It is configured as follows.

  When recording of a call is started by the call information management device automatically or by a user's operation, a pulse signal synchronized with a pulse signal group in which time information is coded on a voice signal of a call and a composite signal obtained by superimposing an ID signal The generated composite signal is sampled and recorded at the sampling frequency of the above condition.

  When the recording is completed, the end time derived from the internal clock is encoded and sampled digital data is added to the end of the recorded data. When this digitized data is reproduced through a low-pass filter whose upper limit is the band pulse filter band of the telephone, the voice can be reproduced with the same quality as a telephone call. Also, when played back through a bandpass filter with the upper limit of the bandpass filter of the telephone set as a threshold, the encoded time information derived from the internal clock of the recording device or a pulse signal synchronized with the step and an ID signal that is continuous Can be played.

  Then, by calculating the number of pulse signals from arbitrary time information obtained by decoding encoded time information recorded at appropriate intervals during recording start time and end time, any number of calls can be determined. The time derived from the internal clock of the device at the time can also be traced back. If the time information of the internal clock is provided with a mechanism (for example, a key clock described in Japanese Patent Application No. 2002-366268) that allows accurate and fair time information to be audited by the distribution organization, the time when the call was made can be determined. It becomes possible to authenticate with the certification body.

  The present invention is as described above, and in an apparatus for recording and storing the contents of a telephone call, an audio signal and an accompanying signal composed of time information and ID information that can be separated and extracted are superimposed, and the synthesized signal is digitally sampled. By doing so, you can create digital data in which the incidental signal is tightly linked to the audio signal, and after that, you can play the audio without degrading the audio quality of the call, retroactively the time when the call was made, or the recorded call It is possible to specify an information management device.

  In addition, according to the present invention, it is possible to continuously embed time information and the ID of the recorded device continuously in data in which the content of a call is recorded with a simple device configuration. Even if it is extracted, the time can be determined. Further, it is difficult to tamper with the recorded contents by the time information and the continuous ID information, and the recorded call information management device can be specified. As described above, by using the call information management device according to the present invention, call records with very high evidence can be realized.

  Hereinafter, an apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of a call information management apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a communication network including a telephone 11 or the like and a general telephone or IP telephone line network 12, Is a time distribution organization that distributes accurate time such as universal time, 30 is a communication network such as the Internet 31, 40 is an input circuit that receives an audio signal from the communication network 10, and 50 is an audio signal or time signal. It is a call management unit to process.

  More specifically, the input circuit 40 includes a signal synthesis unit 41 that synthesizes a voice signal from the telephone 11 and a predetermined signal from the call management unit 50, an amplification unit 42 that amplifies the output signal of the signal synthesis unit 41, and an amplification The A / D converter 43 converts the output signal of the unit 42 into a digital signal.

  The call management unit 50 includes an internal clock 51 that performs accurate stepping based on accurate time information from the time distribution organization 20, an encoding unit 52 that encodes current time information of the internal clock 51, and an encoding unit 52. The signal generation unit 53 for generating a predetermined signal with the encoded signal as an input, the recording unit 54 for storing and recording the output data of the A / D converter 43 of the input circuit 40, and a recording unit 54 comprising a high-pass filter and a low-pass filter. A filter unit 55 for filtering the recorded data, an amplification unit 56 for amplifying the output signal of the filter unit 55, a speaker 57 that receives the output signal of the amplification unit 56, and a decoding unit for decoding the high-pass signal of the filter unit 55 58, a voice synthesis unit 59 that synthesizes a voice signal decoded (reproduced) by the decoding unit 58, an amplification unit 60, and a speaker 61, constituted by the display control unit (controller) 62 and a display 63, which receives the output signal of the decoding unit 58.

  In the apparatus of FIG. 1, the time distribution organization 20 transmits accurate time information to the internal clock 51 of the call management unit 50 via the Internet 31 and performs regular audits. The internal clock 51 calibrates its own time based on the time information of the time distribution organization 20 and sends the current time information to the encoding unit 52. The encoding unit 52 encodes the current time and sends the encoded time information to the signal generation unit 53. The signal generation unit 53 sends the time code signal obtained by sampling the time information into the time code and the ID (identification) signal of the call management unit 50 to the signal synthesis unit 41 of the input circuit 40.

  The signal synthesis unit 41 sends a synthesized signal obtained by synthesizing the voice signal, the time code signal, and the ID signal from the telephone set 11 to the A / D converter 43 via the amplification unit 42. The A / D converter 43 quantizes the synthesized signal at a sampling frequency higher than twice the upper limit frequency of the pass band by the band pass filter of the telephone set 11 and transmits the quantized signal to the recording unit 54.

  The recording unit 54 sends the stored and recorded information to the filter unit 55. The filter unit 55 filters the high-pass signal and the low-pass signal. The low-pass signal is sent to the speaker 57 via the amplification unit 56, and the high-pass signal is decoded. 58. The decoding unit 58 reproduces the high-pass signal from the filter unit 55 and sends it to the post-sound synthesis unit 59 and also to the display control unit 62. The voice synthesis unit 59 sends the voice synthesis signal to the speaker 61 via the amplification unit 60. The display control unit 62 sends the time at the time reproduction to the display 63 based on the reproduction signal from the decoding unit 58. The display 63 displays the time and the recording time from the internal clock 51.

  In addition, when the call recording is started automatically or by user operation, the encoding unit 52 first decodes the time information of the internal clock 51, generates it as a pulse signal group via the signal generation unit 53, and transmits it. To do. Starting from this recording start time, a pulse signal synchronized with the advance of the internal clock 51 is generated and transmitted via the signal generator 53. The pulse signal may be an interval that can be measured by the recording unit 54 corresponding to the required time resolution, or may be a 1-second signal that can be easily recognized by humans.

  The signal generation unit 53 generates an arbitrary signal composed of a single frequency component or a plurality of frequency components in a band that is higher than the upper limit frequency of the pass band by the band pass filter of the telephone set 11 and is ½ of the sampling frequency. At the same time, an ID signal having at least one frequency unique to the recording unit 54 is also generated by the signal generation unit 53 and continuously transmitted. At an arbitrary time point, transmission of a pulse signal group in which time information derived from the internal clock is coded and transmission of a pulse signal synchronized with the progress of the internal clock are repeated. Further, this signal and a composite signal added to the voice signal of the call including the continuous ID signal are added via the A / D converter 43 to the upper limit frequency 2 of the pass band by the band pulse filter of the telephone set 11. Quantize at a sampling frequency higher than double.

  The recording unit 54 may be a memory built in the recording unit itself, or a recording device such as a hard disk of a personal computer connected to the outside. Also, when using a personal computer, the internal clock of the personal computer is managed so that it cannot be manually calibrated, and the internal clock of the personal computer is used as an “internal clock”, and the signal generator 53, filtering means, signal reproducing means, encoding The calculation means and the decode calculation means may be configured by software installed in a personal computer. At that time, the signal synthesizer 53 and the A / D converter 43 are placed between the telephone and the line network, and the quantized data is sent to the input port of the personal computer.

  When reproducing only the voice of the recorded data, a band equivalent to the pass band of the band-pass filter of the telephone 11 is reproduced via the low-pass filter. When the time information of the recorded data is reproduced, the pulse group of the time information is converted into time information by the decoding calculation means via the high-pass filter, and is reproduced by a display or voice synthesis. In order to confirm the ID of the recording unit in which the data is recorded, the ID signal recorded in the pulse signal group of the time information can be easily checked through the high-pass filter by performing FFT.

  Currently, in order to reduce the amount of communication data, a band-pass filter capable of transmitting only a frequency of 300 Hz to 3400 Hz is used as a pass band by a telephone using a telephone line network. Therefore, as shown in FIG. 2, if the sampling frequency for quantization is 11.0525 kHz (recording frequency that is 1/4 of the recording frequency of a CD or the like), signals up to 5 kHz can be sufficiently Nyquist sampled. Is possible.

  Nyquist sampling is sampling more than twice for one period of a signal to be sampled, and is a signal sampling method for performing signal processing such as FFT. That is, sampling is performed at a sampling frequency higher than twice the maximum frequency included in the signal.

  The frequency constituting the pulse signal group in which the time information is coded, the pulse signal synchronized with the step, or the ID signal is configured in a frequency band of 4 KHz to 5 KHz. The time information of the internal clock 51 is encoded through an encoding unit 52 that performs digital encoding. Since 32 bits are sufficient to encode the year, month, day, minute, and second, for example, the binarized data 1 is 5 [msec] and 0 is 10 [msec], and the data interval is data 0. 10 [msec], the maximum data length is 20 [msec], and even if the maximum data is continuous, 640 [msec] is well within one second. However, when it is necessary to perform time information with a resolution of 1 second or less, a time code is transmitted at the recording start time and the recording end time, and at an appropriate interval during a call, and thereafter the step according to the desired resolution is performed. It can be completed with the advance pulse.

  When the recorded digital data is reproduced at the same 11.025 KHz as when it was sampled, the pulse signal overlaps with the sound as shown in FIG. 3, and it sounds like noise. Therefore, in the case of reproducing audio, only the audio part can be extracted by reproducing through a low-pass filter having an arbitrary frequency of 3.4 KHz to 4 KHz as a threshold. The time information can be checked by reproducing it through a high-pass filter with an arbitrary frequency of 3.4 KHz to 4 KHz as a threshold, extracting the code of the time information, and decoding this code.

  FIG. 3 is a signal waveform diagram showing the result of actually superimposing a step pulse on the audio signal and sampling the signal, and superimposing the audio signal shown in (A) and the step pulse signal shown in (B). Thus, a synthesized signal obtained by superimposing the step signal on the audio signal as shown in FIG. FIG. 4 shows an audio signal extracted from the synthesized signal by the low pulse filter, and FIG. 5 shows an advance pulse signal extracted from the synthesized signal by the high-pass filter.

  As shown in FIG. 2, the ID of the call management unit 50 uses a frequency that is not used as a pulse signal in the frequency band of 4 KHz to 5 KHz. If the frequency constituting the ID in the frequency band is determined every 25 Hz, 40 frequencies can be selected. If 30 of these are used, the number of IDs is 230 (= 107.374 million types), and a sufficient number of IDs can be secured.

  The time distribution organization 20 always connects the call management unit 50 to the network 30 so that the time information of the internal clock 51 is periodically audited and calibrated. Alternatively, the internal clock 51 is audited and calibrated by connecting the call management unit 50 itself or the internal clock unit to an information terminal that can be connected to the network as a detachable structure. In this case, the internal clock 51 is provided with an expiration date, and the internal clock whose expiration date has expired does not always transmit time information during recording, but transmits only an ID signal. The expired internal clock is connected to the time distribution organization 20 via the network, and after the time calibration is performed, the expiration date is updated, and thereafter, the time signal is transmitted at the time of call recording until the next expiration date. .

  FIG. 6 shows an operation flow of audio processing. As shown in the drawing, a recording start operation is performed automatically or by a user in step S1, and the recording unit 54 starts recording in step S2. In step S3, the signal generation unit 53 starts sampling, and in step S4 starts transmission of an ID signal. In step S5, the encoding unit 52 encodes the time information of the internal clock 51. In step S6, the signal generator 53 transmits a pulse signal group of time information. In step S 7, the signal generation unit 53 transmits a pulse signal in accordance with the progress of the internal clock 51. In step S8, it is determined whether the call has ended. If it is determined in step S8 that the call has not ended, the process proceeds to step S9, and it is determined whether or not a fixed time has elapsed since the start of recording. If the predetermined time has elapsed, the process returns to step S5, and the operations of steps S5 to S6 are repeated. If the predetermined time has not elapsed in step S9, the process returns to step S7, and the operations from step S7 to S8 are repeated.

  If the call is finished in step S8, the process proceeds to step S10, where the encoding unit 52 encodes the time information of the internal clock 51. Next, in step S11, the signal generation unit 53 transmits a pulse signal group of time information, stops the ID signal in step S12, and stops sampling in step S13. In step S14, the recording unit 54 ends the recording, and the operation of the apparatus ends.

According to the above embodiment, in the call information management device for connecting the telephone to record the contents of the telephone call, the time information derived from the internal clock is recorded in the recorded call contents from the start time of the call recording to the end time. The contents and time when a call is exchanged can be identified from the results recorded later.

  Assuming that the internal clock of the call management unit is derived from the clock of a time distribution organization that delivers accurate and fair time information and is continuously monitored by that organization, the time of the recorded call content is authenticated By enabling the institution to authenticate, the authenticity of the time when the call was made is improved.

1 is a configuration block diagram of a call information processing apparatus according to an embodiment of the present invention. Explanatory drawing which shows distribution of the frequency band at the time of implement | achieving the telephone call information processing apparatus by embodiment of this invention. The wave form diagram which shows the result of having superimposed the stepping pulse on the actual audio | voice signal of the telephone call information processing apparatus of this invention, and having sampled the signal. The wave form diagram of the audio | voice information extracted by applying the low pulse filter to the result sampled in the telephone call information processing apparatus by embodiment of this invention. FIG. 5 is a waveform diagram of step pulse information extracted by applying a high pulse filter to a sampled result in the call information processing apparatus according to the embodiment of the present invention. The operation | movement flowchart of the audio | voice process in the telephone call information processing apparatus by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Telephone network 11 Telephone 12 General or IP telephone network 20 Time distribution organization 30 Communication network 31 Internet 40 Input circuit unit 41 Signal synthesis unit 43 A / D converter 50 Call management unit 51 Internal clock 52 Encoding unit 53 Signal generation unit 54 recording unit 55 filter unit 57 speaker 58 decoding unit 59 speech synthesis unit 61 speaker 62 display control unit 63 display

Claims (11)

A call information management device that records a call content digitally automatically by being built in or connected to a telephone, or by a user operation,
It consists of a time distribution organization that prescribes accurate time, a call management unit that manages call information, and an input circuit unit that receives an output signal of the call management unit and a voice signal from the telephone, and defines the call time An internal clock; a quantizing means for quantizing a call voice signal and a signal accompanying the call time signal; a signal generating means for generating a predetermined signal based on the signal quantized by the quantizing means; A recording means for storing and storing a digitized signal that can be built into the management unit or attached to the outside; and a signal reproducing means for reproducing the recorded digital data as sound,
A synthesized signal obtained by continuously or discretely superimposing an arbitrary signal generated by the signal generating unit on the voice signal of the recorded call is quantized by the quantizing unit and recorded as digital data in the recording unit. After that, the call information management apparatus is configured to reproduce the recorded and saved data by the signal reproduction means through the filtering means. 2. The call information management apparatus according to claim 1, wherein a sampling frequency in the quantization means is a sampling frequency higher than twice an upper limit frequency of a pass band by a band pass filter of a telephone. The signal generation means generates a signal composed of a single frequency or a plurality of frequencies in a frequency band higher than an upper limit frequency of a pass band by a band pass filter of the telephone and lower than a half of the sampling frequency. The call information management device according to claim 1, wherein the call information management device is a call information management device. The filtering means includes a low-pass filter that cuts off a frequency higher than the threshold and a high-pass filter that cuts off a frequency lower than the threshold, with an upper limit frequency of a pass band of the telephone band-pass filter as a threshold. Item 4. The call information management device according to item 1, 2 or 3. The predetermined signal generated by the signal generating means is a signal obtained by encoding the current time information indicated by the internal clock using an encoding calculation means for encoding the time information of the internal clock mounted on the call management unit. The call information management device according to claim 1, wherein the call information management device is a call information management device. 5. The predetermined signal generated by the signal generation means is a pulse-like signal that advances an internal clock mounted on the call management unit. Call information management device. The predetermined signal generated by the signal generation means is an ID signal of a call information management device configured by a combination of frequencies determined for each call information management device. Or the call information management device according to 4. Sampling the signal transmitted by encoding the completion time of the call recording, using the encoding operation means for encoding the current time information of the internal clock mounted on itself, continuing the recording for a certain time after the call recording is completed 5. The call information management device according to claim 1, wherein the call information management device is quantized with a frequency and added to the end of the recorded data and recorded. A code of time information coded and recorded is extracted by the high-pass filter, and the coded time information is made time information via a decoding calculation means, and is converted to a voice by display or speech synthesis. The call information management device according to claim 1, 2, 3, 4, 5, 6, 7 or 8. 9. A coded and recorded audio signal is extracted by the low-pass filter and reproduced as audio through the signal reproducing means. The call information management device described in 1. Time calibration of the internal clock only by direct communication via a network with a time distribution organization that generates and distributes accurate and fair time information or by indirect communication via an information terminal connected to the network. The call information management device according to claim 1, wherein processing is possible.

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