JP6112483B2 - Communication apparatus and communication method - Google Patents

Description

  The present invention relates to a communication device and a communication method. The present invention relates to a communication device that can be connected to a telephone line, for example.

  Usually, there is a certain distance from the exchange station of analog wired line to the home, and the call characteristics are adapted to it. Also, with the recent spread of optical telephones, when a telephone is connected to a line terminator such as an optical telephone adapter, the equipment from the telecommunications business company to the home is connected with a digital line, and a terminal such as an optical telephone adapter is provided on the telephone side. An adapter (TA: Terminal Adapter) is installed. As described above, the telephone may be connected to an analog wired line switching center at a distance or may be connected to a terminal adapter installed in a house.

  In Japan, an ordinary fixed telephone line has a contract of one of PB (Push Button) / 20 pps (pulse per second) / 10 pps. When a call is made at any of PB / 20pps / 10pps and the dial tone disappears, it is determined that the call has been accepted, and the line type can be determined.

  For example, in Patent Document 1, when a predetermined partner station is called by sequentially using selection signals of different signal formats and signal speeds, and the partner station answers, a call is made to use the signal format and signal speed at that time. A device is disclosed that makes it possible to set a calling system suitable for a communication line to be connected by controlling the means. First, a DTMF (Dual Tone Multi Frequency) mode is selected to call a specific partner station. When the polarity reversal detection circuit detects the polarity reversal of the line, it registers that DTMF is used for subsequent calls. When there is no polarity reversal, dialing is performed using a dial pulse generator with a signal speed of 20 pps. When polarity inversion occurs, the mode is set so that a selection signal having a signal speed of 20 pps is used thereafter.

  Japanese Patent Application Laid-Open No. 2005-228561 discloses a connection line automatic identification function added to a communication device to easily connect a telephone line and allow a user to quickly change a setting in response to a telephone line change. Has been. Japanese Patent Application Laid-Open No. 2004-228620 discloses a device that sets an apparatus according to the type and characteristics of a line when it is determined that the connection line is a public line or a PBX line.

JP-A-63-248260 JP 63-117549 A

  However, what is disclosed in Patent Document 1 is to perform mode setting by sequentially using selection signals (dial signals) of different signal formats and speeds, and when the telephone is connected to a terminal adapter. Is not disclosed.

  In the device disclosed in Patent Document 2, when a connection line is determined to be a public line or a PBX (Private Branch eXchange) line, an apparatus is set according to the type and characteristics of the line. However, there is no solution for a case where the telephone is connected directly to a terminal adapter installed in a house where the telephone is installed, instead of being directly connected to a public line or a PBX line.

  For example, when the optical telephone adapter and the telephone are connected, the distance between the optical telephone adapter and the telephone is almost the same. However, since a normal telephone has a call characteristic in which a certain amount of line loss is included, if the distance is lost, the balance of the call characteristic is lost, and the sound quality is likely to deteriorate due to howling and reverberating sound.

  Until now, home telephones have been configured to set “Yes” / “No” in the TA / splitter connection setting menu in the user settings, but the operation cannot be recognized by the user. There are many. For example, when an optical telephone contract is made by the user and an optical telephone adapter is connected between the public line and the telephone, it is necessary to set “Yes” in the TA / splitter connection setting menu to lower the call level. In this case, there are many cases where the user continues to use the operation without being recognized, and the sound quality remains degraded.

  The present invention has been made in view of the above circumstances, and provides a communication device and a communication method that can easily set the line type even in the presence of a terminal adapter and can suppress deterioration in sound quality.

The communication device of the present invention is a communication device that communicates via a communication line, transmits a plurality of types of dial signals to the communication line side, and when all types of dial signals are normally received, Line type determination processing for determining that there is a terminal adapter connected to the communication line and determining that there is no terminal adapter connected to the communication line when at least one type of dial signal is not normally received And a signal level adjusting unit for controlling a signal level of a signal transmitted to the communication line side or a signal incoming from the communication line side according to a determination result by the line type determination process .

  For example, the communication device of the present invention includes a detection unit that detects whether or not the terminal device is connected. An ADSL (Asymmetric Digital Subscriber Line) terminal adapter and an optical telephone adapter can normally accept any of the above line types. Utilizing this characteristic, the communication device of the present invention automatically determines whether it is connected to a terminal adapter or directly connected to an office switch of an analog telephone network even during or after the installation of the communication device. And adjusting the signal level according to the result.

  According to the present invention, even when a terminal adapter is present, the line type can be easily set and deterioration of sound quality can be suppressed. For example, the user can determine the presence or absence of a terminal adapter without manually setting the line type, thereby improving the call characteristics.

1 is a block diagram showing an example of a base unit of a cordless telephone according to an embodiment of the present invention The block diagram which shows an example of the subunit | mobile_unit of the cordless telephone which concerns on embodiment of this invention Functional block diagram showing functions of the base unit according to the embodiment of the present invention The block diagram which shows the state in which the main | base station which concerns on embodiment of this invention is connected to the terminal adapter The flowchart which shows the line | wire type determination process of the main | base station based on embodiment of this invention. The flowchart including the result of line type determination processing of the master unit and the result display according to the embodiment of the present invention Sequence chart showing signal exchange between base unit and telephone line side and processing in base unit in line type determination process according to embodiment of present invention

(Overview of one embodiment of the present invention)
A communication apparatus according to an aspect of the present invention is a communication apparatus that communicates via a communication line, and transmits a plurality of types of dial signals to the communication line side, and normally receives a predetermined number or more types of dial signals. If it is determined that there is a terminal adapter connected to the communication line, and if less than the predetermined number of types of dial signals are normally received, the terminal adapter connected to the communication line is A line type determination unit that executes a line type determination process for determining that there is no signal, and a signal level of a signal sent to the communication line side or a signal coming from the communication line side according to a determination result by the line type determination process And a signal level adjusting unit for controlling.

  Thereby, even in a state where a terminal adapter is present, the line type can be easily set, and deterioration of sound quality can be suppressed.

  In the communication device according to one aspect of the present invention, the line type determination unit transmits a plurality of types of dial signals to the communication line side, and when all types of dial signals are normally received, If it is determined that there is a terminal adapter and at least one type of dial signal is not normally received, it is determined that there is no terminal adapter.

  This eliminates the need for the user to set the presence / absence of the terminal adapter, and can determine the presence / absence of the terminal adapter to improve the call characteristics.

  In the communication device according to one aspect of the present invention, the line type determination unit transmits a DTMF signal, a 10-pulse / second pulse signal, and a 20-pulse / second pulse signal as a dial signal to the communication line side. Based on each response signal for each dial signal, it is determined whether or not all types of dial signals have been normally received.

  Thus, it is possible to improve the call characteristics by determining the presence or absence of the terminal adapter without having to determine whether or not the user has normally received various dial signals.

  In addition, the communication device according to one aspect of the present invention has a power supply unit for supplying power obtained from a commercial power supply, and the line type determination unit detects that power is input by the power supply unit. In the case, the line type determination process is executed.

  As a result, the call characteristics can be improved without the user being aware of it.

  In the communication device according to one aspect of the present invention, the line type determination unit executes the line type determination process when the connection of the communication line to the communication device is detected.

  As a result, the line type can be easily set without user operation, and the call characteristics can be improved.

  Further, in the communication device according to one aspect of the present invention, the line type determination unit executes the line type determination process when the line type determination mode is set to a predetermined mode, and the determination by the line type determination process is performed. The result is displayed on the display unit.

  Accordingly, for example, when the user selects the automatic mode as the line type determination mode, the line type (for example, PB / 20pps / 10pps) setting can be facilitated, and the call characteristics can be improved.

  A communication method according to an aspect of the present invention is a communication method in a communication apparatus that communicates via a communication line, wherein a plurality of types of dial signals are transmitted to the communication line side, and a predetermined number or more types of dial signals are transmitted. When it is normally received, it is determined that there is a terminal adapter connected to the communication line. When a dial signal of a type less than the predetermined number is normally received, the terminal adapter is connected to the communication line. A step of executing a line type determination process for determining that there is no terminal adapter, and a signal level of a signal sent to the communication line side or a signal coming from the communication line side according to a determination result by the line type determination process Controlling.

  Thereby, even in a state where a terminal adapter is present, the line type can be easily set, and deterioration of sound quality can be suppressed.

  Embodiments of the present invention will be described below. A configuration example of the communication apparatus according to the embodiment will be described. FIG. 1 is a block diagram showing an example of a base unit of the cordless telephone according to the present embodiment. FIG. 2 is a block diagram showing an example of the handset of the cordless telephone. The circuit configuration of the communication apparatus according to the present embodiment will be described with reference to FIGS. A cordless telephone is an example of a communication device.

  The cordless telephone according to the present embodiment includes a parent device A connected to a public line and a child device B (see FIG. 2) that communicates with the parent device A wirelessly. First, the configuration and function of base unit A will be described. FIG. 1 shows a case where the main unit A is connected to a metal line connected to an office switch C of an analog public line.

  Base unit A includes a line interface (TEL line interface) 1 and a signal processing unit (DSP (Digital Signal Processor) IC (Integrated Circuit)) 2. The base unit A includes a storage unit (for example, a flash memory) 3, a radio unit (RF (Radio Frequency) Part) 4, and an antenna 5. The main unit A includes a display unit (for example, LCD (Liquid Crystal Display)) 6, an operation unit (for example, operation keys (Keys)) 7, a microphone (Microphone) 8, a speaker 9, and a power supply unit 10. .

  The line interface 1 is a circuit that connects a telephone line (an example of a public line, an example of a communication line) and a master unit A, and a circuit and a bridge that perform line impedance matching with an office switch C or a terminal adapter TA. Includes circuitry. The office switch C or the terminal adapter TA is connected to a telephone line connected to telephone line terminals (T) and (R). Further, the line interface 1 receives a Ring signal (ring signal) sent to the telephone line terminals (T) and (R) and physically detects an incoming call or an end call, or physically closes and opens the line. Do.

  In addition, the line interface 1 can connect the dial pulse DP (Dial Pulse) 10 pulse signal or the dial pulse DP 20 pulse signal to the exchange C or the terminal adapter TA connected to the telephone line by interrupting the direct current. Send. The line interface 1 receives a Caller ID signal or transmits and receives a call signal.

  The signal processing unit (DSP IC) 2 is a circuit that controls the operation of the audio processing and the entire communication device, and includes an analog multiplexer (Analog Multi-Plexer) 2a, a codec (CODEC) 2b, and a digital speech processor 2c, which will be described later. . The signal processing unit 2 includes a speech encoding / decoding processing unit (ADPCM: Adaptive Differential Pulse Code Modulation) 2d described later. Further, the signal processing unit 2 includes a time division multiplexing processing unit (TDD & TDMA (Time Division Duplex & Time Division Multiple Access)) 2e described later.

  The storage unit 3 is a memory in which the signal processing unit 2 writes and references, and stores a telephone book including a telephone number and a destination name, a program necessary for the operation of the digital speech processor 2c, and the like.

  The wireless unit 4 is a wireless circuit for performing wireless communication with the slave unit B. The wireless unit 4 receives a wireless radio wave signal induced in the antenna 5 and supplies the signal to the signal processing unit 2. The received signal is converted into a radio signal and sent to the antenna 5 to perform transmission processing.

  The display unit 6 is a display device using liquid crystal, for example, and performs various displays based on control from the signal processing unit 2. For example, the display unit 6 displays a display related to the line type determination when the base unit A is installed, that is, displays the guidance shown in Step 11 of FIG. 5 and the guidance shown in Steps 14 to 20 of FIG. The installation of the parent device A includes, for example, connection or reconnection to the communication line of the parent device A.

  The operation unit 7 includes a “dial” key, a “hold” key, a “call” key, and the like. In addition to dial input, the operation unit 7 can instruct initial settings when the base unit A is installed and settings related to line type determination. For example, when the user operates the operation unit 7 to set the line type determination mode to “automatic mode”, the signal processing unit 2 determines the line type immediately after the setting operation, when the power is turned on, or when the telephone line is connected. The process is started and the determination result is displayed on the display unit 6.

  The microphone 8 inputs a voice from the user when recording an absence message or performing a hands-free call (calling without holding the handset).

  The speaker 9 emits a ringing tone when receiving an incoming call, and utters a telephone number and a name corresponding to the Caller ID signal supplied from the signal processing unit 2. The speaker 9 outputs the voice of the other party when performing a hands-free call.

  The power supply unit 10 supplies DC power to each unit at a predetermined voltage based on power obtained from a commercial power source.

  Here, the configuration of the signal processing unit 2 will be described in detail.

  The analog multiplexer 2a is a circuit that selects and outputs one signal from a plurality of input signals. For example, the analog multiplexer 2a switches the input from the line interface 1 and the microphone 8 and outputs it to the codec 2b. In FIG. 1, the analog multiplexer 2a switches the path of analog audio signals to be input / output among the line interface 1, microphone 8, speaker 9, and codec 2b.

  The codec 2b is a codec that performs conversion between an analog signal and a digital signal. The codec 2b converts an analog signal in a voice band coming from a telephone line via the microphone 8 or the line interface 1 into a digital signal or reversely converts it.

  The digital speech processor 2c is an electronic circuit including a CPU and the like, and is connected to a storage device such as the storage unit 3 and an input / output circuit such as the operation unit 7 via a bus (signal line), and receives digital audio signals. Various processes are performed.

  The speech encoding / decoding processing unit (ADPCM) 2d is a processing unit for encoding / decoding speech used for communication with the slave unit B. Here, as an example, adaptive differential PCM (ADPCM), which is one of encodings using adaptive quantization, is used.

  The time division multiplex processing unit 2e is a processing unit for realizing a communication method for performing time division communication with the slave unit B, and communication (uplink communication) from the slave unit B to the master unit A, On the contrary, in order to divide communication (downlink communication) from the parent device A to the child device B, communication is performed at intervals of time.

  The above is the configuration of the signal processing unit 2, but the digital speech processor 2c can perform an operation corresponding to, for example, the following service by reading and executing the control program stored in the storage unit 3. .

  FIG. 3 is a block diagram illustrating a functional configuration example of the signal processing unit 2. That is, the signal processing unit 2 includes functions of a call signal detection unit 2f, a dial tone detection unit 2g, a DTMF signal transmission / reception unit 2h, a line type determination unit 2i, a dial transmission unit 2j, and a signal level adjustment unit 2k.

  The call signal detector 2f recognizes the incoming ring signal for the call based on the detection signal from the line interface 1.

  The dial tone detection unit 2g determines a response signal from the office switch C connected to the telephone line.

  The DTMF signal transmission / reception unit 2h modulates / modulates digital data into an analog signal for transmission over a telephone line and demodulates the digital data from the analog signal.

  The line type determination unit 2i determines the line type of the communication line connected to the parent device A. For example, the line type determination unit 2i detects that the terminal adapter TA is connected to the telephone line terminals (T) and (R).

  When a call request is generated, the dial transmission unit 2j instructs the line interface 1 to close the telephone line. In this case, when a response signal is transmitted from the central office switch C and the dial tone detection unit 2g receives the response signal, the DTMF signal transmission / reception unit 2h performs dial transmission. Alternatively, when a pulse dial line is connected to the main unit A, when the dial transmission unit 2j detects a response signal from the central office C, the dial transmission unit 2j sends a control signal of the line interface 1 to the central office C to perform pulse dial transmission. Do.

  The signal level adjustment unit 2k adjusts the transmission signal level, the gain for amplifying the incoming signal, and the like. When the signal level adjustment unit 2k is operating, the gain for amplifying the transmission signal level and the incoming signal according to the impedance viewed from the telephone line terminals (T) and (R) (the side of the exchange C) Switch etc. When the telephone line terminals (T) and (R) are connected to a remote switching center C, the signal transmission intensity is increased so that attenuation can be compensated, and the incoming signal (for example, control by voice signal or DTMF) Signal) with high gain.

  However, when the terminal adapter TA is connected to the telephone line terminals (T) and (R) as shown in FIG. 4, if the signal level adjustment unit 2k is operating, the transmission signal level is stronger than necessary. Or the incoming signal may be amplified more than necessary.

  FIG. 4 is a block diagram showing a configuration example when the base unit A of the cordless telephone is connected to the terminal adapter TA. When connected to the central office E via ADSL or the like via the terminal adapter TA, a signal is output from the terminal adapter TA to the public line network for calling.

Next, the configuration and function of the slave unit B will be described.
FIG. 2 is a block diagram illustrating a configuration example of the slave unit B. The slave unit B includes a signal processing unit 20, a storage unit (for example, an EEPROM (Electrically Erasable Programmable Read Only Memory) 11, a radio unit 12, and an antenna 13. The slave unit B includes a display unit (LCD) 14, an operation. A unit 15, a microphone 16, a speaker 17, and a ringer speaker 18.

  The configuration of the slave unit B corresponds to the master unit A as follows. For example, the signal processing unit 20 is the signal processing unit 2 of the base unit A, the storage unit 11 is the storage unit 3 of the base unit A, the radio unit 12 is the radio unit 4 of the base unit A, and the antenna 13 is the base unit A. Correspondingly, the antenna 5 has the same function. Therefore, the description of the corresponding part is omitted. Further, the speaker 17 is a call speaker that outputs the voice of the other party during a normal call. The ringer speaker 18 emits a ringing tone for incoming calls.

  When there is a call from the other party in the communication device (slave unit B), a call signal such as a Ring signal is transmitted from the central office switch C to the line interface 1 of the base unit A according to the call control procedure. When this call signal is received by the digital speech processor 2c via the analog multiplexer 2a and the codec 2b, the incoming call is detected and transmitted to the child device B via the voice encoding / decoding processing unit 2d. .

  In the handset B, the radio unit 12 receives and processes the data from the base unit A received by the antenna 13, and the signal processing unit 20 performs time division multiplexing processing, call control processing, and voice decoding processing, The ringer speaker 18 outputs a sound. In the reception process, for example, data received by a modem unit (not shown) is demodulated.

  When the user presses the “call” key of the operation unit 15 to respond to the call, the signal processing unit 20 detects the press of the “call” key, and sends the connect signal by the call control process to the path opposite to the above-described path. To base unit A.

  The base unit A that has received the connect signal from the handset B transmits to the public line (calling party) through a path opposite to the above-described calling path, thereby transitioning to a call state.

  In this call state, a call voice signal from the call partner is transmitted to the child device B via the above-described route. The slave unit B receives the data from the master unit A received by the antenna 13 by the radio unit 12, and the signal processing unit 20 performs time division multiplexing processing, call control processing, and voice decoding processing, and the call voice The signal is output as sound from the speaker 17. In the reception process, for example, data received by a modem unit (not shown) is demodulated.

  Further, in transmission from the slave unit B to the other party, the voice input from the microphone 16 is transmitted to the public line via the master unit A through a path opposite to the voice output described above. Through the above process, the call partner and handset B continue the call.

  Furthermore, when the user ends the call from the slave unit B, when the user presses the “end” key of the operation unit 15, the signal processing unit 20 detects the press of the “end” key, and the call control process ends the sound. Send to A. The signal processing unit 2 of the base unit A that has received the end-call sound from the handset B notifies the call partner of the end-call through a path opposite to the above-described call path, and controls the line interface 1 to control the DC loop. Is disconnected, the communication path with the central office switch C is disconnected.

  Next, as shown in FIG. 4, the control operation when the telephone line terminals (T) and (R) of the communication apparatus (master A) are connected to the terminal adapter TA will be described.

  The signal processing unit 2 controls the line interface 1 in an off-hook state when transmitting number data, a control message, or the like to the telephone line side. In this case, a direct current loop is generated in the telephone line terminals (T) and (R) by the current source inside the terminal adapter TA, and an off-hook state is entered. Thereafter, the terminal adapter TA and the parent device A start transmission / reception of number data, messages for control, and the like.

  In the case of an incoming call, the terminal adapter TA first transmits a ring signal to the parent device A. When a ring signal is applied to the telephone line terminals (T) and (R) of the main unit A, the ring signal is detected by the line interface 1. The detection signal is sent to the signal processing unit 2. When the signal processing unit 2 controls the line interface 1 to the off-hook state, a direct current loop is generated at the telephone line terminals (T) and (R) by the current source inside the terminal adapter TA, and the line interface 1 enters the off-hook state. Thereafter, the terminal adapter TA and the parent device A start transmission / reception of number data, messages for control, and the like.

  The terminal adapter TA may be a known one. The terminal adapter TA has an ADSL communication function with the central office E, a current source function that causes a DC loop to flow through the telephone line terminals (T) and (R) on the telephone terminal (main unit A) side, and a telephone line. A function of applying a Ring signal to the terminals (T) and (R) is provided. Further, the terminal adapter TA has a function of transmitting / receiving audio signals to / from the telephone terminal side and a function of transmitting / receiving DTMF signals. Further, the terminal adapter TA has a function of receiving pulse dial signals of DP10 and DP20 so as to be compatible with pulse dial telephone terminals. Further, the terminal adapter TA is not limited to ADSL, but may be an optical telephone adapter using optical communication or an ISDN line.

  Note that DP10 indicates a dial pulse method of 10 pulses per second. DP20 indicates that the dial pulse method is a 20 pulse per second method.

  Hereinafter, the line type determination process will be described with reference to FIG.

  First, at Step 1, the signal processing unit 2 enters a line off-hook state and closes the loop.

  Next, in Step 2, it is detected whether or not a line current flows. When it is detected that the line current is flowing (Step 2: YES), in Step 3, the signal processing unit 2 determines whether or not a dial tone dial tone comes in. When a dial tone is detected for 1 second continuously, the signal processing unit 2 determines that there is a dial tone.

  When it is determined that there is a dial tone (Step 3: YES), the signal processing unit 2 determines that the state is normally connected to the office switch C or the terminal adapter TA of the analog public line.

  Subsequently, at Step 4, the signal processing unit 2 sends a dial signal “0” for determination to the line side. The dial signal includes three types, that is, a push button signal (PB signal), a DP10 pulse signal of the dial pulse, and a DP20 pulse signal, and sequentially transmits the signal type while switching the flow of FIG. . Initially, a push button signal (PB signal) is transmitted.

  Next, in Step 5, the signal processing unit 2 determines whether or not the dial tone has stopped and becomes silent. The signal processing unit 2 starts a 1 sec timer for waiting for stabilization after the completion of the transmission of the dial signal. After this timer expires, the dial tone continues to be detected for 5 sec of the DT (Dial Tone) detection time, Alternatively, it is determined whether or not there is silence.

  When the dial signal transmitted in Step 4 is normally received by the exchange C or the terminal adapter TA, the exchange C or the terminal adapter TA stops sending the dial tone. If the dial signal is not successfully received by the central office C or the terminal adapter TA, the dial tone continues without stopping.

  The signal processing unit 2 determines whether the dial tone continues or stops during 5 seconds of the DT detection time, and stores the determination result related to the dial signal “0” at Step 6 at Step 6. For example, when the dial tone stops when the PB signal is transmitted, the signal processing unit 2 records “OK” which means that there is no sound as the determination result corresponding to the PB signal. When the dial tone does not stop, the signal processing unit 2 records “NG” as the determination result corresponding to the PB signal.

  In Step 7, the signal processing unit 2 sets the line to an off-hook state, opens the loop, and then starts a 3 sec timer for waiting until it is stabilized.

  In Step 8, the signal processing unit 2 checks whether or not the determination has been completed for all types of dial signals. If the determination has not been completed for all types, Step 1 is used to start determination on the next dial signal. Return to.

  If the determination has been completed for all types of dial signals, the process proceeds to the determination result processing and result display processing in Step 10 (FIG. 6).

  After performing the determination based on the PB signal for the first time, the signal processing unit 2 checks in Step 8 whether or not the determination is completed for all types of dial signals, and returns to Step 1 if not completed for all types. Next, the dial pulse is determined by the DP10 pulse signal.

  When the dial tone is stopped by transmitting the DP10 pulse signal, the signal processing unit 2 records “OK” as the determination result corresponding to the DP10 pulse signal in Step 6. When the dial tone does not stop, the signal processing unit 2 records “NG” as the determination result corresponding to the DP10 pulse signal.

  Thereafter, when the processing has not been completed for all types, the process returns to Step 1, and the signal processing unit 2 next performs determination based on the DP20 pulse signal of the dial pulse. When the dial tone is stopped by transmitting the DP20 pulse signal, the signal processing unit 2 records “OK” as the determination result corresponding to the DP20 pulse signal at Step 6. When the dial tone does not stop, the signal processing unit 2 records “NG” as the determination result corresponding to the DP20 pulse signal.

  If the line current is not flowing when the line current is detected in Step 2 after the line off-hook (Step 2: NO), the signal processing unit 2 makes an error sound. Further, at Step 11, the signal processing unit 2 causes the display unit 6 to display, for example, “Denwaki Code Change” and prompts the user to confirm the connection. Thereafter, if a line current flows (Step 12: YES), the process returns to Step 1.

  Hereinafter, the determination result of the line type determination process and the result display will be described with reference to FIG.

  In the determination result recorded in Step 6 of FIG. 5, if the determination is “OK” for all types of dial signals (Step 13: Yes), the signal processing unit 2 uses the telephone line terminal (T ), (R), it is determined that the terminal adapter TA is connected. In this case, the signal processing unit 2 of the base unit A sets the mode using the push button signal (PB signal), and displays, for example, “push key” on the display unit 6 (Step 14).

  In the determination result recorded at Step 6 in FIG. 5, when the determination is “OK” only with the PB signal (Step 15: Yes), the signal processing unit 2 uses the telephone line terminal (T), ( R) determines that the terminal is not connected to the terminal adapter TA but is connected to the office switch C of the analog public line. Also in this case, the signal processing unit 2 of the parent device A sets the mode using the push button signal (PB signal) and causes the display unit 6 to display, for example, “push keysen” (Step 16).

  In the determination result recorded in Step 6 in FIG. 5, when the determination by the DP20 pulse signal is “OK” (Step 17: Yes), the signal processing unit 2 transmits the telephone line terminal (T), In (R), it is determined that it is connected not to the terminal adapter TA but to the office switch C of the analog public line, and it is determined that the dial signal can be transmitted by the DP20 pulse signal. In this case, the signal processing unit 2 of the base unit A sets the mode in which the DP20 pulse signal is used, and causes the display unit 6 to display, for example, “Dial Kaisen 20” (Step 18).

  In the determination result recorded in Step 6 of FIG. 5, when only the determination with the DP10 pulse signal is “OK” (Step 19: Yes), the signal processing unit 2 uses the telephone line terminal (T) of the base unit A. , (R), it is determined that it is connected not to the terminal adapter TA but to the office switch C of the analog public line, and it is determined that the dial signal can be transmitted by the DP10 pulse signal. In this case, the signal processing unit 2 of the parent device A sets the mode using the DP10 pulse signal and causes the display unit 6 to display, for example, “Dial Kaisen 10” (Step 20).

  When the determination results for all types of dial signals are not “OK” (Step 19: No), the signal processing unit 2 sounds an error sound, for example, and displays “Error Death” on the display unit 6 (Step 21). ).

Hereinafter, the operation of the signal level adjusting unit 2k will be described.
If it is determined in the determination result recorded at Step 6 in FIG. 5 that the terminal adapter TA is connected to the telephone line terminals (T) and (R) of the main unit A, the signal processing unit 2 / Turn on the splitter setting. When the TA / splitter setting is on, the signal level adjustment unit 2k is in the TA mode.

  Since the signal strength coming from the terminal adapter TA to the telephone line terminals (T) and (R) of the parent device A is sufficiently strong, amplification at the parent device A is almost unnecessary. When there is a terminal adapter TA, signals output from the telephone line terminals (T) and (R) of the main unit A are input to the terminal adapter TA with almost no attenuation. Therefore, it is necessary to lower the signal strength of the signal sent to the terminal adapter TA as compared with the case of sending the signal to the central office C. In the TA mode, the signal processing unit 2 transmits at an appropriate predetermined signal level when the terminal adapter TA is present, and amplifies an incoming signal with an appropriate predetermined gain.

  Note that the above line type determination process may be started immediately after the setting operation when the user operates the operation unit 7 to set the line type determination mode to “automatic mode”, for example. In addition, when the line type determination mode is set to “automatic mode”, it is detected that the power is turned on by the power supply unit 10 or that the communication line is connected by the line interface 1. It may be activated when detected.

  Hereinafter, FIG. 7 is a sequence chart showing signal exchange between the base unit A and the telephone line side, that is, the office switch C or the terminal adapter TA, and processing in the base unit A in the line type determination process shown in FIG. It is. In FIG. 7, “line” includes, for example, the office switch C or TA connected to the line, and “communication apparatus” includes, for example, a telephone apparatus.

  First, when the signal processing unit 2 enters the line off-hook state and closes the loop, a dial tone dial tone comes from the telephone line side. When the dial tone is detected, the signal processing unit 2 starts a timer and determines whether or not the dial tone has been detected for 1 sec. If it is determined that there is a dial tone (DT determination), the signal processing unit 2 transmits a dial signal “0” for determination to the line side. The signal processing unit 2 first transmits a push button signal (PB signal).

  After the transmission of the dial signal is completed (internal EVT), the signal processing unit 2 starts a 1 sec timer waiting for stabilization, and after this timer expires, whether or not there is no sound during the DT detection time of 5 sec. judge. Thereafter, the signal processing unit 2 stores a determination result related to the dial signal.

  When the determination result related to one dial signal is stored, the signal processing unit 2 puts the line in an off-hook state, opens the loop, waits for the expiration of the 3 sec timer, then closes the loop again, and performs the process for the next dial signal. Start judgment. Thereafter, the signal processing unit 2 sends the dial signal “0” to the line side in the order of the DP10 pulse signal and the DP20 pulse signal of the dial pulse, determines whether or not there is silence, and the determination result related to each dial signal Save.

  As described above, in the present embodiment, when the user selects the line type determination as the automatic mode by menu operation, base unit A determines the presence or absence of terminal adapter TA and sets the line type (PB / 20/10). And call characteristics can be improved. Also, when the power is turned on or when it is detected that the line is connected, the line type determination process can be activated to determine the presence or absence of the terminal adapter TA and improve the call characteristics.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Applicable.

  INDUSTRIAL APPLICABILITY The present invention is useful for a communication device, a communication method, and the like that can easily set the line type even in the presence of a terminal adapter and can suppress deterioration in sound quality. For example, the present invention is useful as a communication device that can be used even when connected to a terminal adapter such as an ADSL terminal adapter or an optical telephone adapter, which is a telephone or a facsimile telephone that can be connected to an analog wired line.

A Base unit B Slave unit C, E Office switch 1 Line interface 2 Signal processing unit 2a Analog multiplexer 2b Codec 2c Digital speech processor 2d ADPCM unit 2e Time division multiplexing processing unit 2f Call signal detection unit 2g Dial tone detection unit 2h DTMF signal transmission / reception Unit 2i line type determination unit 2j dial transmission unit 2k signal level adjustment unit 3 storage unit 4 radio unit 6 display unit 7 operation unit 8 microphone 9 speaker 10 power supply unit (T), (R) telephone line terminal TA terminal adapter 11 storage unit DESCRIPTION OF SYMBOLS 12 Radio | wireless part 13 Antenna 14 Display part 15 Operation part 16 Microphone 17 Speaker for call 18 Speaker for ringer 20 Signal processing part

Claims (6)

A communication device for communicating via a communication line,
When a plurality of types of dial signals are transmitted to the communication line side and all types of dial signals are normally received, it is determined that there is a terminal adapter connected to the communication line, and at least one type A line type determination unit that executes a line type determination process for determining that there is no terminal adapter connected to the communication line;
A signal level adjustment unit that controls a signal level of a signal sent to the communication line side or a signal incoming from the communication line side according to a determination result by the line type determination process;
A communication device comprising: The communication device according to claim 1 ,
The line type determination unit transmits a DTMF signal, a 10 pulse per second pulse signal, and a 20 pulse per second pulse signal to the communication line as a dial signal, and based on each response signal for each dial signal, A communication device that determines whether or not all types of dial signals have been normally received. The communication device according to claim 1 or 2 ,
A power supply unit for supplying power obtained from a commercial power supply;
The line type determination unit is a communication device that executes the line type determination process when it is detected that power is turned on by the power supply unit. The communication device according to claim 1 or 2 ,
The line type determination unit is a communication apparatus that executes the line type determination process when connection of the communication line to the communication apparatus is detected. The communication device according to claim 1 or 2 ,
When the line type determination mode is set to a predetermined mode, the line type determination unit executes the line type determination process and causes the display unit to display a determination result of the line type determination process. A communication method in a communication device for communicating via a communication line,
When a plurality of types of dial signals are transmitted to the communication line side and all types of dial signals are normally received, it is determined that there is a terminal adapter connected to the communication line, and at least one type of dial signal is determined. If the dial signal is not normally received, executing a line type determination process for determining that there is no terminal adapter connected to the communication line;
Controlling a signal level of a signal sent to the communication line side or a signal coming from the communication line side according to a determination result by the line type determination process;
A communication method comprising:

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