JP4497070B2 - Communication terminal device - Google Patents

Description

  The present invention relates to a communication terminal device having a caller telephone number display function, a so-called number display function.

  In recent years, operation of the number display service has been started as one of the pre-communication information notification services. By using this service, caller information such as the caller's phone number is displayed on the telephone before answering the call. It has come to be.

  The display of sender information by the communication terminal device, so-called number display, is an ITU-T recommendation V. 23 is realized by receiving a pre-communication information notification signal compliant with the standard 23, a so-called modem signal, detecting caller data from the received data, and performing data processing. The pre-communication information notification signal (hereinafter referred to as modem signal) includes caller information such as the caller's telephone number.

  Modem signal processing in a conventional communication terminal apparatus will be described below.

  Caller information such as a telephone number on the caller side is transmitted as a modem signal from a subscriber line exchange through a telephone line. On the receiving side, the modem signal is demodulated by a modem circuit to obtain received data converted into digital data. The communication terminal device detects caller data from the received data by detecting a start bit added to the head of the received data with a signal detection circuit. Next, in the data processing circuit, the caller information such as the caller telephone number is extracted from the caller data, and the caller information such as the caller telephone number is displayed on the display unit.

  However, in the communication terminal device configured as described above, when noise or instantaneous interruption occurs in the telephone line, the signal detection circuit may erroneously detect the start bit of the received data. Also, redundant data may be added to the latter half of the received data depending on the timing of signal drop and data processing. As a result, in the former case, the start portion of the caller data is not correctly recognized by the communication terminal device, and in the latter case, redundant data is recognized as the caller data, and thus the caller data is not correctly detected. As a result, since processing cannot be performed by the data processing circuit, there is a problem that caller information such as a caller telephone number is not displayed on the display unit.

  FIG. 1 shows an example of erroneous detection of caller data by the communication terminal device having the above-described conventional configuration. The sender data is sent in a format in which, for example, several “1” mark bits are added before the sender data, followed by one “0” start bit, and 1 after the sender data. This is a format in which a stop bit of “1” is added. In the example shown in FIG. 1, noise is mixed in the mark bit, the noise is erroneously detected as a start bit, and the noise mixed immediately after the position of the stop bit, that is, immediately after the caller data, is a redundant part of the caller data The detected example is shown. In the above example, in order to erroneously detect from the noise mixed in the mark bit to the noise immediately after the caller data as the caller data, the subsequent data processing circuit that processes this cannot extract the caller number, The caller telephone number will not be displayed.

Patent Document 1 uses an echo canceling means to cancel an echo caused by a callee's voice when a call is made from a third party, that is, an interrupter when a call waiting service is used. A technique for reliably displaying an interrupter's telephone number by enabling (CAT) to be reliably recognized is disclosed.
Japanese Patent No. 3449565

However, this technique does not solve the problem caused by noise or instantaneous interruption occurring in the telephone line.
An object of the present invention is to provide a communication terminal device and method capable of accurately detecting caller data and reliably displaying caller information such as a caller number even when noise or instantaneous interruption occurs on a telephone line. Is to provide.

The communication terminal device of the present invention comprises a demodulator that demodulates a pre-communication information notification signal including caller telephone number information to obtain received data, caller data detection means for detecting caller data from the received data, And a display unit that displays caller information based on the caller data, wherein the caller data detection means includes at least one control code among a plurality of control codes included in the caller data. A pattern information storage unit that stores a digital pattern corresponding to the above, and an extraction circuit that extracts the caller data from the received data only when it is detected that the received data includes a pattern that matches the digital pattern; Data length information indicating the data length of the entire sender data is obtained from the information part included in the sender data, and the data A redundant part processing circuit for performing processing for deleting the redundant part when the sender data has a redundant part exceeding the data length indicated by the data length information by comparing the information and the data length of the sender data. It is characterized by having .

  According to the communication terminal device of the present invention, even when noise or a momentary interruption occurs on the telephone line, the caller data is reliably displayed without erroneously detecting the caller data.

Embodiment

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 2 shows the configuration of the number display processing apparatus of the communication terminal apparatus according to the present invention. Note that the communication terminal device refers to a communication terminal device having a voice communication function such as a telephone, a facsimile, and a personal computer having a communication function.

  The modem circuit 110 demodulates the modem signal transmitted from the subscriber line exchange through the telephone line, converts it into digital data, and outputs the received data converted into the digital data to the subsequent stage. The buffering unit 121 retains the reception data supplied from the modem circuit 110. The pattern information storage unit 122 stores a predetermined digital pattern corresponding to each of one or a plurality of control codes included in the caller data. The extraction circuit 123 searches the received data staying in the buffering means 121 for a pattern that matches the digital pattern corresponding to one or more control codes of the sender data stored in the pattern information storage unit 122. Extract caller data. The caller data detection unit 120 includes the buffering unit 121, the pattern information storage unit 122, and the extraction circuit 123 described above. The redundant part processing circuit 130 deletes redundant data added to the sender data supplied from the buffering means 121. The data processing circuit 140 extracts caller information such as a caller telephone number from the caller data supplied from the redundant part processing circuit 130. The display unit 130 displays caller information such as a caller telephone number based on the caller information supplied from the data processing circuit 140.

  Next, the connection operation of the caller telephone number notification service will be described with reference to the sequence of FIG. (S1) to (S9) in the figure are codes assigned to each operation step.

  The subscriber line switch inverts the polarities of the subscriber lines L1 and L2 on the receiving terminal side when a call is made from another communication terminal apparatus to a communication terminal apparatus for which a service contract has been made in advance (step S1). Next, the subscriber line exchange sends an information receiving terminal activation signal (CAR) (step S2). On the other hand, when the receiving terminal is ready to receive the caller information, the receiving terminal closes the DC loop in the terminal and sends a primary response signal (step S3). When the exchange side determines the primary response signal based on the change in the DC resistance value, it sends a pre-communication information notification signal including caller information, that is, a modem signal, to the receiving terminal side (step S4). When the receiving terminal side receives the modem signal, it opens the DC loop and sends a reception completion signal (step S5), and the exchange side that receives this sends a call signal (step S6). When the receiving terminal detects the calling signal, the receiving terminal sounds a ringing tone to prompt a response. Since the receiving terminal side receives the caller information in advance and displays it on the display, the called party can visually recognize the caller information and take action according to the other party. For example, the call can be left as it is or switched to an answering machine. Here, when a response is made to the calling signal by picking up the handset or the like, the DC loop is closed again and a secondary response signal is transmitted (step S7). After that, the polarity is reversed so that a call can be made (step S8) and (step S9).

  If the caller information sent by modem signal cannot be notified of the caller's phone number in addition to the phone number of the caller's communication terminal device, the operation before entering the phone number ("184" is dialed) Indication of the reason such as non-notification designation by, etc., or originating from a public telephone is included.

  Next, referring to FIG. 4, the data format of the sender data used in the number display will be described. The sender data is serial data composed of control codes of DLE, SOH, header, STX, information, ETX, and CRC, and the data length is a maximum of 128 bytes.

  The control code SOH indicates the start of information message heading. The header is a title for sending information from the subscriber line switch to the communication terminal. The control code STX indicates the start of text and the end of heading. The service type notifies that the content of the transmission information is a caller telephone number notification service. The message content length indicates the total number of bytes from the subsequent parameter (1) to the parameter (n). The parameters (1) to (n) indicate the parameter type including the caller telephone number, the reason for non-notification of the caller telephone number, the caller telephone number extension information, the information content length, and the content of the transmission information. The control code ETX indicates the end of the text. CRC is an error detection code. A predetermined transmission mode control code DLE is added immediately before each control signal.

  The above control codes are arranged in the order of mark bits, DLE, SOH, header, DLE, STX, information, DEL, ETX, and CRC from the subscriber line exchange and transmitted to the communication terminal apparatus through the telephone line.

  Next, the processing operation of the caller data including the caller information in the communication terminal device according to the present invention will be described in detail with reference to FIG.

  As described above, the subscriber line exchange 100 sends a modem signal including caller information such as a caller telephone number to the receiving terminal before ringing the ringing tone of the receiving communication terminal device. The transmitted modem signal is received by the modem circuit 110. The modem signal is an analog signal transmitted to the analog telephone line, and the modem circuit 110 demodulates the received modem signal so that the communication terminal device can perform processing for acquiring caller information such as a caller telephone number. The digital data is converted into digital signals, and the received data converted into digital data is transmitted to the buffering means 121.

  The buffering means 121 retains the received data supplied from the modem circuit 110 for processing by the extraction circuit 123 described later. The data length retained in the buffering means 121 is the same as the data length stored in the pattern information storage unit 122 described later.

  The pattern information storage unit 122 stores a predetermined digital pattern corresponding to one or a plurality of control codes included in the sender data. That is, a predetermined digital pattern defined by the specification is assigned to each control code of the above-described sender data format as shown in FIG. A predetermined digital pattern corresponding to one or a plurality of control codes included in the caller data is stored in the pattern information storage unit 122 in the same order as the arrangement sent from the subscriber line switch. For example, as shown in FIG. 6, the pattern information storage unit 122 stores “0010000, 0000001, 0000111” corresponding to DLE, SOH, and header.

  These are merely examples, and the number of digital patterns corresponding to each control code stored in the pattern information storage unit 122 can be appropriately set in consideration of the data processing time by the extraction circuit 123 described later.

  The extraction circuit 123 searches the received data staying in the buffering means 121 for a pattern that matches the digital pattern corresponding to each control code of the sender data stored in the pattern information storage unit 122.

  The above processing will be described with reference to FIG. 7 as an example where the pattern information storage unit 122 stores digital patterns “0010000, 0000001, 0000111” corresponding to DLE, SOH, and header.

  The extraction circuit 123 stores the above three data stored in the pattern information storage unit 122 in the order of data supplied from the subscriber line switch (modem circuit 110) from among the data remaining in the buffering means 121. A search is made for a pattern that matches the control code, that is, the digital pattern “0010000, 0000001, 0000111” corresponding to the DLE, SOH, and header. In other words, the extraction circuit 123 retrieves three control codes of DLE, SOH, and header from the received data supplied from the modem circuit 110 at once. When a digital pattern different from the above example is stored in the pattern information storage unit 122, it can be easily understood that a search for a pattern that matches the pattern is performed.

  If a matching pattern is not detected by the extraction circuit 123, the received data staying in the buffering means 121 is updated one sample at a time and stored in the pattern file storage unit 124 from the updated data again. Searches for a pattern that matches the digital pattern that is being displayed.

  By detecting the same pattern as the digital pattern stored in the pattern information storage unit 122 by the extraction circuit 123, it is possible to accurately extract desired sender data from the received data. In other words, even when noise or instantaneous interruption occurs on the telephone line, the control code included in the caller data is directly searched to detect the data, so that the start part of the caller data is not erroneously detected. It becomes possible to detect data accurately.

  When the extraction circuit 123 detects the same pattern as the digital pattern stored in the pattern information storage unit 122 and extracts the caller data, the buffering unit 121 sets the redundant units in the order sent from the subscriber line switch. The extracted caller data is transmitted to the processing circuit 130.

  The redundant part processing circuit 130 performs processing for deleting redundant data added to the latter half of the sender data supplied from the buffering means 121. That is, the redundant part processing circuit 130 determines the total from parameter (1) to parameter (n) from the “information” part of the format of the sender data shown in FIG. 3 among the sender data transmitted from the buffering means 121. The “message content length” indicating the number of bytes is read to obtain information indicating the data length of the entire sender data (hereinafter referred to as data length information). Next, the obtained data length information is compared with the data length of the entire actual sender data supplied from the buffering means 121. And when the data length of actual sender | caller data has a redundant part longer than the said data length information, the process which deletes the said redundant part is performed. For example, when the length of the entire caller data read from the “information” portion of the caller data is 120 bytes and the caller data actually transmitted is 121 bytes, the redundant part processing circuit 130 One byte added to the last part of the sender data is regarded as unnecessary redundant data and deleted.

  The redundant part processing circuit 130 transmits the data to the data processing circuit 140 after deleting the redundant part of the sender data. That is, the data transmitted to the data processing circuit 140 is accurately extracted by the extraction circuit 123, and the data from which the redundant part added to the data is deleted by the redundant part processing circuit 130 is transmitted. That is, the caller data necessary for displaying the caller telephone number and the like on the communication terminal device is transmitted to the data processing circuit 140 in a state where there is no excess or shortage.

  The data processing circuit 140 extracts caller information from the transmitted data and displays the caller information such as the caller telephone number on the display unit 130.

  As described above, according to the present invention, by detecting each digital pattern corresponding to one or more control codes included in the caller data, the caller data is extracted and added to the caller data. Since the redundant data is deleted, the caller data can be detected correctly without false detection even when noise or instantaneous interruption occurs on the telephone line, and the caller information such as the caller phone number can be accurately detected. Therefore, it is possible to reliably display caller information such as a caller telephone number.

It is a figure which shows the example of the misdetection of the sender | caller data in the conventional communication terminal device. It is a block diagram which shows the structure of the number display processing apparatus which is an Example of this invention. It is a figure which shows the connection operation | movement of a sender | caller telephone number notification service. It is a figure which shows the data format of sender | caller data. It is a figure which shows the digital pattern corresponding to each control code of sender | caller data. It is a figure which shows an example of the digital pattern stored in a pattern information storage part. It is a figure which shows an example of the sender | caller data extracted by the communication terminal device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 Modem circuit 120 Caller data detection means 121 Buffering means 122 Pattern information storage part 123 Extraction circuit 130 Redundant part processing circuit 140 Data processing circuit 150 Display part

Claims (1)

A demodulator that demodulates a pre-communication information notification signal including caller telephone number information to obtain received data, caller data detection means for detecting caller data from the received data, and a caller based on the caller data A communication terminal device including a display unit for displaying information,
The caller data detection means includes a pattern information storage unit that stores a digital pattern corresponding to at least one control code among a plurality of control codes included in the caller data, and a pattern that matches the digital pattern. An extraction circuit that extracts the caller data from the received data only when it is detected that the data includes, and
Data length information indicating the data length of the entire caller data is obtained from the information part included in the caller data, and the caller data is compared by comparing the data length information with the data length of the caller data as a whole. A communication terminal apparatus comprising: a redundant part processing circuit that performs a process of deleting a redundant part when the redundant part exceeds the data length indicated by the data length information .

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