JP2001217921A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a recording and reproducing device that can reproduce a speech file having no identification code and retrieve the speech file in a short time. SOLUTION: The recording and reproducing device is provided with a DTMF code detection section, a voice signal level comparison section, a time code generating section, a recording and reproduction control section, and a control section that discriminates a silence part of speech information on the basis of a comparison signal from the voice signal level comparison section. The speech information is divided into speech files by the silence part, and recorded to a data recording section. Index file including a DTMF code and data of time information is recorded to a file management section under the control of a control section. The control section controls also the recording reproduction section so as to record a time information data consisting of a speech start time of a first speech file and a speech end time of the final speech file among a plurality of speech files in speech information to the index file.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus for recording and reproducing call information transmitted and received via a telephone line.

[0002]

2. Description of the Related Art Call information transmitted and received via a telephone line includes a DTMF (Dual Tone Multi-Frequency) signal and a voice signal. DT decoded DTMF signal
A call recording / reproducing apparatus which records an MF code and call data obtained by compressing a voice signal in a recording unit, and records information on a track on which a DTMF code is recorded and a track on which call data is recorded in a header as header data is a special feature. It is disclosed in Japanese Unexamined Patent Publication No. 10-112752.

According to Japanese Patent Application Laid-Open No. 10-112752, a DTMF code, call data, and SMPTE (Society of Motion Pic)
ture & Television Engineers) or EBU (European Br)
A time code standardized by the Oadcasting Union is recorded, and a DTMF code and a time code are recorded in the header as information indicating when the call data was recorded. By reading the time code data recorded in the header, it is possible to easily determine whether the data continuously recorded in the recording unit is DTMF code data or call data.

Japanese Patent Application Laid-Open No. 10-112752 discloses that in a call recording / reproducing apparatus, the data amount of call data to be recorded is statistically reduced to about 30% by deleting data of a silent part during a call. It states that it can.

[0005]

As in the prior art, the speech data obtained by deleting the silence part data from the speech data is treated as one track, that is, one file, and recorded in the recording part. At the same time as the file is deleted, it may be divided into a plurality of tracks, that is, a plurality of files, and recorded as a plurality of files. If the call data is divided into a plurality of files, there is an advantage that each divided file can be searched and the contents of the call can be confirmed.

As means for dividing the call information into a plurality of call files, a DTM obtained by decoding a DTMF signal is used.
After recording the F-code and the call data in the recording unit, if the conversation during the call is interrupted for a certain period of time and the level of the audio signal falls below a certain level, it is regarded that the call has ended and the recording of the call data is stopped. I do. Thereafter, when it is detected that the conversation has resumed and the level of the audio signal has reached a certain level or higher, the recording of the detected call data is started as a new call file. Therefore, even during a call with the telephone line connected, if the conversation during the call is interrupted for a certain time or more, the conversation before and after the interruption due to silence is recorded as call data of a different call file.

Here, during a call, if a process of temporarily stopping the recording of the conversation content due to silence for a predetermined time or more is performed, the conversation is started again, and it is detected that the level of the audio signal is higher than the predetermined level, and the recording is performed. Even when the operation is started, a new DTMF signal is not detected, and therefore, the recording unit includes a DTM which is an identification code for searching for call data.
No F code is added and recorded. If the DTMF code is added to the call data, the call data can be searched. However, the DTMF code is not added to the call data of the call file divided by the silence part. Can not search.

In the call recording / reproducing apparatus described in Japanese Patent Application Laid-Open No. 10-112752, the DTMF code and the call data are each treated as one track and recorded in the recording unit. If the time code data relating to the track where the DTMF code is recorded and the track where the call data is recorded are recorded in the header, the track where the DTMF code is recorded and the call data are recorded by reading the header data. The track can be determined, and it becomes easy to select and read one of the tracks.

However, when the call data is divided into a plurality of tracks, that is, a plurality of files due to silence during a conversation, the call contents of the call data of the call file to which the DTMF code divided by the silence part is not added are checked. In order to be able to do so, it is necessary to create information data on all the call files divided into a plurality of pieces and record them in the header. Since information relating to all call files is recorded in the header, the data amount of information recorded in the header increases. Further, when searching for a call file including a DTMF code, call data, and a time code, it is necessary to read information about all the call files recorded in the header, so that the time required for searching for a call file becomes longer.

In order to solve the above-mentioned problems, the present invention makes it possible to reproduce a call file having no identification code such as a DTMF code by using a time code recorded in a recording section, so that the identification code can be reproduced. It is an object of the present invention to obtain a recording / reproducing apparatus which can reproduce all of the call data related to the searched call data when the call data having the character string is searched, and can shorten the search time of the call file. .

[00011]

SUMMARY OF THE INVENTION The present invention relates to a recording / reproducing apparatus for recording and reproducing call information transmitted / received via a telephone line, comprising: a DTMF code detecting section for detecting a DTMF code from the call information; An audio signal level comparison unit that compares the level of the audio signal of the information with a predetermined level, a time code generation unit that generates time information,
A recording unit that records the data of the call information and the time information, a recording and reproduction control unit that controls recording and reproduction of the call information and the data of the time information in the recording unit, and the audio signal level comparison unit. Determining the silent part of the call information based on the comparison signal of the above, and controlling the recording / reproducing control unit so that the call information is divided into a plurality of call files by the silent part and recorded in the data recording unit; A control unit that controls the recording and reproduction control unit to record an index file including time information data of a code, a call start time, and a call end time in a file management unit of the recording unit, wherein the control unit includes: The time information data of the call start time of the first call file of the plurality of call files and the call end time of the last call file of the plurality of call information of the call information are transferred to the first call file. Wherein as the start time and call end time is the recording and reproducing apparatus for controlling the recording and playback control unit to record in the index file.

The present invention also relates to a recording / reproducing apparatus for recording and reproducing call information transmitted / received via a telephone line, further comprising a search operation unit for inputting a search condition of the call information recorded in the recording unit. The control unit reads a call file from the recording unit based on time information data of a call record start time and a call record end time of a call file recorded in the index file that matches a search condition, and reads the read call. A recording / reproducing apparatus for controlling the recording / reproducing control unit to reproduce call data in the order of earlier time of time information recorded in a file.

The present invention also relates to a recording / reproducing apparatus for recording and reproducing call information transmitted / received via a telephone line, wherein the control unit detects a DTMF code when reading a call file from the recording unit. Is DTMF
A recording / reproducing apparatus for controlling the recording / reproducing control unit to stop reproduction of call data of a call file read after detecting a code.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a call recording / reproducing apparatus according to one embodiment of the present invention. FIG. 2 is a diagram schematically illustrating an example of recording call data and time code of one call information in the call recording / reproducing device of the present embodiment.

The voice processing unit 1 converts an analog voice signal input from a telephone line into digital data, converts it into compressed speech data, and further decompresses the compressed speech data recorded in the recording unit 7. After being demodulated into the digital data, the digital data is output to the audio output unit 9. The audio output unit 9
The demodulated digital data is converted into an analog audio signal, amplified, and output to the outside.

The incoming call detection unit 2 receives a DTMF signal transmitted from a telephone set of a caller connected to the telephone line, and detects that the telephone line is connected. Since the DTMF code obtained by decoding the DTMF signal includes information such as the telephone number of the called party, the DTMF code is recorded in the recording unit 7 as information relating to the call data. The DTMF code is used to retrieve call data. The DTMF signal is, for example, 0 to 0 depending on a combination of frequency signals transmitted from the telephone to the telephone line by a user's push button operation.
Signals representing codes such as 9, #, *, etc., and a signal obtained by decoding these signals is called a DTMF code.

When the telephone line is connected and the conversation is started, the audio signal level comparing section 3 compares the audio signal level with a predetermined constant level to detect the rising time of the audio signal and to control the control section. 5 is output. The control unit 5 controls the recording and reproduction control unit 6 to start recording the communication data and the time code data output from the time code generation unit 4 in the recording unit 7 when the comparison signal from the audio signal level comparison unit 3 is input. Control. In a state where the telephone line is connected and the telephone call is continued, the control unit 5 measures the time during which the conversation is interrupted for a certain period of time and the silence continues, based on the comparison signal output from the audio signal level comparison unit 3. The silent section is determined, and the recording / reproduction control section 6 is controlled so as to stop recording the call data in the recording section 7.

The time code generator 4 has a reference clock oscillator, operates as a timer for measuring date and time, minutes and seconds, and outputs a time code as time information data to the controller 5. The control unit 5 stores the call data in the data recording unit 7b.
And the time code is recorded in the time code recording section of the data recording section 7b. The time at which the call data was recorded can be specified by the time code.

For example, as shown in FIG. 2, when the call data (1) and the call data (2) are recorded in the data recording unit, the times t1 to t, which are the times when the call data is recorded, are recorded.
n and P1 to Pm are recorded in the time code recording unit as time codes.

The control unit 5 uses the signals output from the incoming call detection unit 2, the voice signal level comparison unit 3, and the time code generation unit 4 to record the call data, the DTMF code, and the time code, which is time information data, in the recording unit 7. The recording / reproduction control unit 6 is controlled to record. In addition, the control unit 5 performs DTMF recording in the file management unit 7a of the recording unit 7 according to the call file search condition input from the search operation unit 8.
Search for a call file that matches the code and time code information.

The recording / reproducing control unit 6 records and reproduces communication data, DTMF code and time code information in the data recording unit 7b of the recording unit 7 in accordance with a command from the control unit 5. Further, the recording / reproducing control unit 6 stores the DTMF code and the call start time and the call end time of the call file in the file management unit 7a in accordance with a command from the control unit 5.
Record and play back.

The recording unit 7 has an HDD (H) capable of recording and reproducing call data, DTMF code and time code information.
ard Disk Drive) or a data recording / reproducing unit such as a DAT (Digital Audio Tape) drive.

FIG. 3A is a diagram for explaining an index file for each channel recorded in the file management section 7a of the telephone call recording and reproducing apparatus according to the present embodiment. FIG. 3 (b)
FIG. 4 is a diagram for explaining a DTMF code, call data, and a time code recorded for each channel to be recorded in the data recording unit 7b of the call recording / reproducing apparatus of the present embodiment. FIG.
Is a file management unit 7a of the call recording / playback apparatus of the present embodiment.
DTMF code of the index file recorded in
FIG. 7 is a diagram illustrating a recording example of a call start time and a call end time of a time code. Here, the channel refers to a predetermined recording area on a recording medium for recording a telephone conversation file given to each telephone connected to the private branch exchange, and the number assigned to this recording area is a channel number. That.

In the case of the call information record example shown in FIG. 2, one call information includes a call file (1) and a call file (2), and the call file includes call data, a time code, and a DTMF code. If detected, it is composed of DTMF code data. The call data of each call file is recorded in the data recording unit, and the time code is recorded in the time code recording unit. As the time code, in the case of the call file (1), time information data from t1 to tn is sequentially recorded. In the case of the call file (2), P1 to P1
The time of Pm is recorded. By reading the time code data recorded in the time code recording section, it is possible to specify the call data in the call file.

When the silence time Ti between the call data (1) and the call data (2) is longer than a predetermined fixed silence time T0, the operation of recording the call data in the recording unit is stopped. At this time, an index file that uses the DTMF code of the call file (1), the call start time, and the call end time as data is created and recorded in the file management unit 7a. Next, when the conversation is resumed during the call and the sound signal level comparison unit 3 detects that the sound signal level has become higher than a predetermined level, the call data (2) is recorded in the data recording unit. To start. However, an index file for the file of the call data (2) (call file (2)) is not created, and the call data (1) is not created.
Is updated to the call end time of the call data (2). In FIG. 3B, the DTMF code, the call data, and the time code data of the call file are recorded in the recording area of the channel number assigned to each telephone on the recording medium. In the case of this embodiment, the channel number assigned to the telephone is CH
This is an example in which 1 is set.

FIG. 4 shows a DTM of an index file recorded in the file management unit of the call recording / reproducing apparatus according to the present embodiment.
It is a figure explaining the example of recording of the call start time and call end time of F code and time code. FIG. 4A is a diagram showing data recorded in the index file when the call file (1) is recorded in the data recording unit. FIG. 4B is a diagram showing data in which the call end time of the index file is updated when the call file (2) is recorded in the data recording unit. In this embodiment, assuming that one call information includes a call file (1) and a call file (2), the call file (1) and the call file (2) are combined to create one index file, and It is recorded on the recording unit 7a. The index file of CH1 of the file management unit shown in FIG.
Data of an index file relating to the call file (1) and the call file (3) shown in FIG.

FIG. 4A and FIG. 4B will be described. When the call file (1) is recorded, the data of the index file has the DTMF code “0000111”.
1 ”, the call start time of the time code is 8:15,
The call end time is 8:30. That is, as shown in FIG. 4A, the talk time at this point is 15 minutes. Next, when the call file (2) is recorded in the data recording unit, the call end time of the call file (2) is recorded as the call end time of the index file. FIG.
In (b), the call end time of the index file relating to the call file (1) is updated from 8:30 to 8:40. FIG. 4 (b) shows that the talk time is 25 minutes.

The call file (3), the call file (4) and the call file (5) in FIG. 4B will be described.
Since the call file (3) is the first call file at the start of a call, when the call file (3) is recorded, an index file of the call file (3) is created, and the DTMF code of the call file (3) and the call Data of the start time and the call end time are recorded. Subsequently, as the call file (4) and the call file (5) are recorded, the call end time of each call file is recorded in the call end time of the index file. When the recording of the call file (5) ends, the call end time of the index file is updated to 9:10. The call start time and the call end time recorded in the index file indicate that the call time is 25 minutes.

Next, the operation of the telephone call recording / reproducing apparatus of this embodiment will be described. FIG. 5 is a flowchart illustrating an operation of creating a call file and an index file of the call recording / playback apparatus of the present embodiment.

First, when a call is started, DTMF
Check whether a signal has been received. If the DTMF signal has been received, it is determined that the telephone conversation has been started, and the process proceeds to step S103. (S101), (S102)

An index file for recording information related to the call file is created and recorded in the file management section 7a of the recording section 7. The received and decoded DTMF code and the call start time t1 of the call data (1) are recorded in the index file. (S103), (S104)

If the telephone line is disconnected, a certain signal is transmitted to the telephone. Therefore, by detecting a predetermined signal transmitted to the telephone, the connection state of the telephone line can be detected. If the telephone line is not disconnected, the control unit determines whether the state in which the audio signal level has become lower than the predetermined level has continued for a predetermined time using the comparison signal output from the audio signal level comparator. .
(S105), (S106), (S107)

If there is no sound for a certain period of time, the call end time data tn of the call data (1) is recorded at the call end time in the index file. When the conversation during the call is resumed and the audio signal level becomes equal to or higher than the certain level, the process proceeds to S101. (S108), (S109)

In step S101, recording of call data is started, and in step S102, it is confirmed whether a DTMF signal has been received. If the DTMF signal is not transmitted, S1
Move to 10. S110 to S112 correspond to S
The description is omitted because it is the same as the steps from 105 to S107. (S110), (S111), (S112)

After executing S112 and recording the call data (2), the call end time data tn in the index file is replaced with the call end time data pm in the call data (2).
Rewrite to (S113) Thereafter, the flow shifts to S109, and this operation is continued as long as the telephone line for the telephone call is connected. This operation ends when the voice signal disappears and a predetermined signal indicating that the telephone call has been disconnected is detected. (S114)

Next, a description will be given of an operation of retrieving a call file of the call data recorded by the above operation.
FIG. 6 is a flowchart for explaining the operation of reading the information on the call file recorded in the file management section 7a of the recording section 7 of the call recording / reproducing apparatus of the present embodiment and reproducing the call data.

When a search condition for searching for call information is input from the search operation unit 8, the control unit 5 stores an index file related to the call file recorded in the file management unit 7a of the recording unit 7 shown in FIG. A call file that matches the search condition is searched based on the recorded data. For example, the recording / reproduction control unit 6 is controlled so as to search for a search condition “000011111” from the DTMF code recorded in the index file. (S201), (S2
02)

The call start time and the call end time are read from the index file of the call file that matches the search condition. (S203), (S204)

The control unit 5 compares the call start time and the call end time read from the index file with the time of the time code recorded in the time code recording unit, and compares the call start time and the call end time between the call start time and the call end time. Select a file. When the call data of the selected call file is reproduced, the time code is reproduced in the order of earliest time. In this embodiment, since the call file of the channel number assigned to each telephone is recorded in the recording area determined by the data recording section in chronological order, the time information data is reproduced in the earliest order. Therefore, when the first call file is searched and the reproduction of the call data is started, the call data is read in the order of the time information data until the call end time of the index file is reached. (S205)

If the call start time of the call file read out sequentially exceeds the call end time of the index file, it is determined that the call file has call information different from the call information to be searched, and reproduction is stopped. I do. Thereby, all the call data of one call information can be reproduced. (S206)

If the call start time of the searched and read call file has not passed the call end time of the index file, it is checked whether a new DTMF code has been detected. If a new DTMF code has not been detected, the flow shifts to S205 to continue reproduction of the call data.
If a new DTMF code is detected, it is determined that the file is a call file having call information different from call information to be searched, and reproduction is stopped. Thereby, all the call data of one call information can be reproduced. (S20
6), (S207)

As described above, the call recording / reproducing apparatus of the present invention creates an index file for recording information about a call file when a call is started in the file management unit for managing the call file, and The recording end time is rewritten to the recording end time of the newly recorded call data. When a call file is searched, the data of the recording start time and the recording end time of the index file is read, and compared with the time code recorded in the data recording unit, the reproduction is continued until the recording end time is reached. When the call file whose recording end time has passed is read, the reproduction of the call data is stopped. If a new DTMF code is read before the recording end time is reached, it is determined that one call information has ended, and reproduction of the call data is stopped.

[0043]

According to the present invention, even if there is no identification code for identifying a call file, if the first call file among the plurality of call files divided by the silent part is selected and the call data is reproduced, the index can be obtained. From the time information recorded in the file, all call files in one call information can be continuously read and reproduced. Further, since it is only necessary to create and record only an index file for recording information about a call file at the time of starting a call in the file management unit, the amount of data to be recorded in the file management unit can be reduced. You can search for a call file by time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a call recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating a recording example of call data and time code of one call information in the call recording / reproducing apparatus of the embodiment.

FIG. 3 is an index file for each channel recorded in a file management unit and a DTMF code for each channel recorded in a data recording unit of the call recording / reproducing apparatus of the embodiment;
It is a figure explaining a call file and a time code.

FIG. 4 is a diagram illustrating a recording example of a call start time and a call end time of a DTMF code and a time code of an index file recorded in a file management unit of the call recording / reproducing apparatus of the embodiment.

FIG. 5 is a flowchart illustrating an operation of creating a call file and an index file of the call recording / playback apparatus of the present embodiment.

FIG. 6 is a flowchart illustrating an operation of retrieving a call file recorded in a file management unit of a recording unit of the call recording / reproducing apparatus of the embodiment and reproducing call data.

[Explanation of symbols]

1 audio processing section, 2 incoming call detection section, 3 audio signal level comparison section, 4 time code section, 5 control section, 6 recording / reproducing section, 7 recording section,
7a file management unit 7b data recording unit, 8 search operation unit, 9 audio output unit

Claims (4)

[Claims] 1. A recording and reproducing apparatus for recording and reproducing call information transmitted and received via a telephone line, comprising: a DTMF code detector for detecting a DTMF code from the call information; An audio signal level comparing unit for comparing with a determined level, a time code generating unit for generating time information, a recording unit for recording the data of the call information and the time information, and a data of the call information and the time information. A recording / reproducing control unit that controls recording and reproduction on the recording unit; and a silence part of the call information based on the comparison signal from the audio signal level comparison unit. The recording / reproducing control unit is controlled so as to be divided into a call file and recorded in a data recording unit, and the DTMF code, the time information of the call start time and the time information of the call end time are recorded. A control unit for controlling the recording and reproduction control unit to record an index file including data in a file management unit of the recording unit, wherein the control unit is configured to control a first call file of a plurality of call files of the one call information. Controlling the recording / reproducing control unit to record the time information data of the call start time and the call end time of the last call file in the index file as the call start time and the call end time of the first call file. Recording and playback device. 2. The recording / reproducing apparatus according to claim 1, further comprising a search operation unit for inputting a search condition of the call information recorded in said recording unit, wherein said control unit matches said search condition. Based on the time information data of the call record start time and the call record end time of the call file recorded in the index file, the call file is read from the recording unit, and the time information recorded in the read call file is in the order of earlier time. A recording / reproducing apparatus which controls the recording / reproducing control unit to reproduce call data. 3. The recording / reproducing apparatus according to claim 1, wherein the control unit includes a call recording end time in which the call end time of the call file read from the recording unit is recorded in the index file. When the time comes, the recording / reproducing control unit is controlled so as to stop reproducing the call data of the read call file. 4. The recording / reproducing apparatus according to claim 1, wherein the control unit detects a DTMF code when detecting a DTMF code when reading a call file from the recording unit. A recording / reproducing apparatus, wherein the recording / reproducing control unit is controlled so as to stop reproduction of call data of a call file read later.