JP2005318276A - Voice communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voice communication apparatus for realizing voice communication with high quality. <P>SOLUTION: This voice communication apparatus arranged between a stored telephone terminal and a communication line for executing voice communication between the telephone terminal and the communication network line, includes a line connecting circuit means for connecting to the communication line circuit; a terminal storage circuit means for storing the telephone terminal; and a connection control means for transferring time-division multiplex data between the line connecting circuit means and the terminal storage circuit means, and for executing connection control between the telephone terminal and the communication network line. In this case, there is only one time-division multiplex transmission line for transmitting time-vision multiplex data among the line connecting circuit means, the terminal storage circuit means and the connection control means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a voice communication apparatus, for example, connection control between a telephone terminal (for example, a telephone, a multifunction telephone, a communication terminal that realizes a telephone function by executing software) and a general public telephone network line. It can be applied to a voice communication device such as an exchange or a VoIP (Voice of IP) gateway device provided with a connection control means (for example, DSP: Digital Signal Processor).

  With the progress of VoIP communication technology using the IP (Internet Protocol) communication network in recent years, it is possible to connect to a PSTN line and an IP network line. Under the control of the DSP, the accommodated telephone and the PSTN line or the IP network line There is a voice communication device (for example, a VoIP gateway device or the like) that realizes voice communication between them.

  When these voice communication apparatuses perform voice communication between a telephone and a PSTN line, the DSP included in the voice communication apparatus is connected to a terminal accommodating circuit (SLIC) that is an interface on the telephone side and a line connection that is an interface on the PSTN line side Voice communication is realized by performing connection control such as call control by transmitting data with a circuit (DAA: Data Access Arrangement).

  FIG. 2 is a block diagram showing the main hardware configuration of a conventional voice communication apparatus. As shown in FIG. 2, the conventional voice communication apparatus 100 transmits a voice signal (time division multiplexed signal) that is time-division multiplexed between the DSP 11, the DAA 13 and the SLIC 12, and therefore a forward highway (hereinafter referred to as FHW). 18 and a back highway (hereinafter BHW) 19 are provided.

  Here, the BHW 19 is a time division multiplex transmission line that gives the DSP 11 the digital audio signal digitally converted by the A / D converter included in the SLIC 12 or the DAA 13 to the DSP 11 in a pre-assigned time slot. The FHW 18 is relayed by the DSP 11. This is a time-division multiplex transmission line for supplying a voice digital signal to the DAA 13 or SLIC 12 in a pre-assigned time slot. For example, the FHW 18 and the BHW 19 have 32 channels of transmission lines in which one period (one frame) is 125 μs and the one period is divided into 32.

  In FIG. 2, DSP 11, DAA 13, and SLIC 12 each have a dedicated HW input terminal and a dedicated HW output terminal, and realize data transmission between DSP 11 and DAA 13 or SLIC 12 via two HWs FHW 18 and BHW 19. ing.

  FIG. 3 is an explanatory diagram showing an example of channel assignment of FHW 18 and BHW 19, for example.

  In FIG. 3, for FHW18, data transmitted from DSP 11 to DAA 13 is assigned to Ch # 0, and data transmitted from DSP 11 to SLIC 12 is assigned to Ch # 1. For BHW19, an example is shown in which Ch # 0 is assigned to data transmitted from the DAA 13 to the DSP 11, and Ch # 1 is assigned to data transmitted from the SLIC 12 to the DSP 11.

  In this case, when an audio signal arrives at the DAA 13 from the PSTN line 3, the audio signal (audio digital signal) is given to the DSP 11 in a predetermined time slot of the BHW 19.

  Then, after the DSP 11 performs channel conversion from BHW 19 to FHW 18, the voice digital signal is given to the SLIC 12 in a predetermined time slot of the FHW 18 and given to the telephone 2 that accommodates it.

  Similarly to the above, the audio signal arriving at the SLIC 12 from the telephone set 2 is given to the DSP 11 via the BHW 18, channel-converted by the DSP 11, given to the DAA 13, and given to the PSTN line 3.

  By the way, when realizing voice communication, an echo signal is generated due to various factors. The generated echo signal enters (returns) the transmission path of the voice signal, and the voice signal including the echo signal is transmitted. There is a risk that the quality of the voice communication may be deteriorated by giving the user a sense of incongruity.

  In general, when the transmission distance is increased, the transmitted signal is likely to be delayed, and the echo signal is also delayed according to the delay. Therefore, for example, when the echo signal of the audio signal enters the audio signal to be transmitted, even if the time difference between the audio signal and the echo signal is a minute time, the transmission distance becomes long and a delay occurs. There is a possibility that the time difference between the echo signals is widened and the feeling of echo is increased.

  Further, when realizing voice communication, since the voice signal is relayed between a plurality of voice communication devices in the communication network, an echo signal is generated in each voice communication device, and the echo signal generated in a complicated manner. May enter the audio signal in an overlapping manner.

  For these reasons, in order to improve the quality of voice communication, it is desired to reduce the time difference between the generated echo signal and the voice signal in the voice communication apparatus.

  In the conventional voice communication apparatus 100, the echo signal can be generated by, for example, conversion processing of an analog 2-wire to 4-wire conversion circuit (for example, a hybrid circuit) provided in the telephone 2, transmission processing in the SLIC 12 or the DAA 13 (FIG. 4).

  However, as described above, the DSP 11, DAA 13 and SLIC 12 have a dedicated HW input terminal and a dedicated HW output terminal, so it is necessary to transmit and receive audio signals via two highways even during a voice call. there were.

  Further, the DSP 11 needs to perform a channel conversion process between the BHW 18 and the FHW 19 so that the transmission data is switched in a time sequence of a predetermined time slot.

  Therefore, depending on the channel conversion processing time by the DSP 11, the time difference between the audio signal and the echo signal may be larger than the time difference between the audio signal and the echo signal at the time when the echo is emitted inside the DAA 13, the SLIC 12, and the telephone 2 or the like. There was also a risk of becoming larger.

  The channel conversion processing time of the DSP 11 depends on the performance of the DSP 11. For example, if it takes about 10 ms, even if the time difference between the audio signal and the echo signal at the time of occurrence in the DAA 13 is a minute time, the delay time is at least Since the channel conversion processing time (for example, 10 ms) of the DSP 11 is added and transmitted, the feeling of echo becomes conspicuous. This leads to deterioration of the quality of voice communication.

  Therefore, there is a demand for a voice communication apparatus that can eliminate the channel conversion process by the connection control means and provide high-quality voice communication.

  In order to solve such a problem, a voice communication device of the present invention is interposed between a telephone terminal to be accommodated and a communication network line, and performs voice communication between the telephone terminal and the communication network line. Line connection circuit means for connecting to a communication network line, terminal accommodating circuit means for accommodating a telephone terminal, time division multiplexed data are exchanged between the line connecting circuit means and the terminal accommodating circuit means, and the telephone terminal and the communication network Connection control means for controlling connection with the line, and one time division multiplex transmission line for transmitting time division multiplexed data between the line connection circuit means, the terminal accommodating circuit means and the connection control means. It is characterized by being.

  According to the present invention, in a voice communication device that is interposed between a telephone terminal to be accommodated and a communication network line and performs voice communication between the telephone terminal and the communication network line, the line connection circuit means for connecting to the communication network line And a terminal accommodating circuit means accommodating the telephone terminal, a line connection circuit means and a terminal accommodating circuit means for transferring time division multiplexed data and controlling connection between the telephone terminal and the communication network line Control means, and a single time division multiplex transmission line for transmitting time division multiplexed data between the line connection circuit means, the terminal accommodating circuit means and the connection control means. Voice communication can be provided.

  The best mode for carrying out the voice communication apparatus of the present invention will be described below with reference to the drawings.

(A) First Embodiment Hereinafter, a first embodiment of a voice communication apparatus of the present invention will be described with reference to the drawings.

  This embodiment is an explanation of a case where the present invention is applied to a voice communication apparatus that can be connected to at least a PSTN line and accommodates a telephone.

  In addition, the voice communication apparatus according to the present embodiment has a single highway configuration between the DSP, DAA, and SLIC so that data can be directly transmitted and received between the DAA and the SLIC during a voice call. To do.

(A-1) Configuration of the First Embodiment FIG. 5 is a configuration block diagram showing a main hardware configuration provided in the voice communication apparatus of the present embodiment.

  In FIG. 5, the voice communication apparatus 1 of this embodiment accommodates a telephone 2 and can be connected to a general public telephone network (PSTN) line 3. FIG. 5 shows a case where one telephone 2 is accommodated for convenience of explanation, but a plurality of telephones can be accommodated.

  The voice communication device 1 can be widely applied to a voice communication device having a connection control function between a receiving terminal and a PSTN line, such as an exchange including a DSP 11, a VoIP gateway device, a router, and a gatekeeper. The voice communication device 1 may be any device that is interposed between the telephone set 2 and the PSTN line 3, and may be applied as a device that can be mounted on the telephone set 2 body, for example.

  The terminal accommodated in the voice communication device 1 can be widely applied as long as it is a telephone terminal having a voice communication function.

  As shown in FIG. 5, the voice communication apparatus 1 of the present embodiment includes a DSP 11, SLIC 12, DAA 13, and control unit 14 via a data bus 15.

  The DSP 11 is connected to the SLIC 12 and the DAA 13 by a single highway (time division multiplexing line) 20.

  The highway 20 connects the DSP 11 with the SLIC 12 and the DAA 13 through a single line, and a time division multiplex transmission in which a predetermined channel is allocated for data transmission between the DSP 11 and the SLIC 12 and the DAA 13. Road. The feature of this embodiment is that the conventional highway between the DSP 11 and the DAA 13 or SLIC 12 is one.

  FIG. 1 is an explanatory diagram illustrating channels assigned to the highway 20. In FIG. 1, the highway 20 shows a case where, for example, one period is set to 125 μs, and the one period is divided into 32 to have 32 channels.

  FIG. 1A shows a channel assigned to data transmission when the telephone 2 and the PSTN line 3 are not in a voice call (also referred to as normal time). Here, the normal time is a case other than during a voice call, for example, when a connection control signal before starting a call between the telephone 2 and the PSTN line 3 is transmitted between the DSP 11 and the DAA 13 or SLIC 12. Say.

  As shown in FIG. 1, on the highway 20, the time slot of ch # 0 is allocated to data transmission from the DSP 11 to the DAA 13 and the time slot of ch # 1 is allocated to data transmission from the DAA 13 to the DSP 11 at the normal time. , Ch # 2 time slot is assigned to data transmission from the DSP 11 to the SLIC 12, and ch # 3 time slot is assigned to data transmission from the SLIC 12 to the DSP 11.

  FIG. 1B shows channels assigned during a voice call between the telephone 2 and the PSTN line 3. As shown in FIG. 1B, on the highway 20, the time slot of ch # 1 is assigned to data transmission from the DAA 13 to the SLIC 12, and the time slot of ch # 3 is assigned to data transmission from the SLIC 12 to the DSP 13. .

  The control unit 14 controls the function of the voice communication device 1, and corresponds to, for example, a CPU. The control part 14 implement | achieves the function of the audio | voice communication apparatus 1 by running the program stored, for example in the memory | storage part 18 (for example, RAM, ROM, etc.). The storage unit 18 stores processing programs and data necessary for processing execution.

  FIG. 6 is a functional block diagram illustrating functions of the voice communication apparatus 1 according to the present embodiment. As shown in FIG. 6, the control unit 14 includes at least a call control unit 142 that controls call connection between the accommodated telephone set 2 and the PSTN line 3, and a setting channel switching control unit 141. Of course, in addition to the control function described above, the control unit 14 has a function provided in a conventional voice communication device, for example, an outgoing / incoming detection control function for detecting an outgoing or incoming call by monitoring the SLIC 12 and the DAA 13, a routing function for selecting a route, A circuit switching function, a traffic measurement function, a maintenance / operation function for performing various communication services, and the like may be provided.

  When a call is started between the telephone set 2 and the PSTN line 3 by the call control unit 142, the setting channel switching control unit 141 switches the transmission channel and the reception channel of the DAA 13 and the SLIC 12, and connects the DAA 13 and the SLIC 12 via the highway 20. The voice data is directly transmitted between them. The setting channel switching control unit 141 switches the transmission channel and the reception channel of the DAA 13 and the SLIC 12 again when the PSTN call of the telephone set 2 is finished.

  As a result, the transmission path between the DSP 11 and the SLIC 12 and between the DSP 11 and the DAA 13 can be disconnected while the telephone 2 is in a PSTN call. When the PSTN call of the telephone 2 is terminated, the transmission path with the DSP 11 is restored. be able to.

  Further, as described above, the highway 20 is configured as one between the DSP 11 and the DAA 13 and the SLIC 12, and as shown in FIG. 1, data is transmitted from the DAA 13 and the SLIC 12 onto the highway 20, respectively. Since the time order of the time slots is the same as in the normal case and during the PSTN call, when the channel on the highway 20 is switched by the setting channel switching control unit 141, the DAA 13 and the SLIC 12 mediate the DSP 11. Without using the highway 20, data can be directly transmitted.

  Therefore, as in the conventional voice communication apparatus, it is possible to avoid the channel conversion processing by the DSP 11 and transmit the voice signal (voice digital signal) directly between the DAA 13 and the SLIC 12. Voice communication can be realized without increasing the time difference from the echo signal.

  The DSP 11 is a digital signal control device that controls voice communication. When the PSTN call of the telephone set 2 is started, the DSP 11 disconnects the transmission path between the DAA 13 and the SLIC 12 under the control of the setting channel switching control unit 141.

  Further, the DSP 11 transmits, for example, a modem signal such as a number display, a PB signal, and the like via the DAA 13 and the SLIC 12 and the highway 20. For the transmission at this time, the channel on the highway 20 shown in FIG. 1A is used.

  The DAA 13 and the SLIC 12 are constantly monitored by the control unit 14 and directly receive incoming calls.

  The DAA 13 is an interface unit that transmits and receives signals to and from the PSTN line 3 side, and a general line system circuit can be applied. Further, the DAA 13 regularly or constantly monitors the line state of the PSTN line 3, and when receiving an incoming call from the PSTN line 3, gives the incoming connection control signal to the control unit 14. The DAA 13 receives a response signal of an incoming connection control signal or an outgoing connection control signal from the control unit 14 and gives it to the PSTN line 3 by predetermined communication control.

  The DAA 13 directly transmits and receives audio signals to and from the SLIC 12 via the highway 20 when the telephone 2 is in a PSTN call.

  The DAA 13 includes a transmission timing control unit 13a. The transmission timing control unit 13a transmits data to the highway 20 in accordance with the time slot of the channel assigned on the highway 20. Further, as shown in FIG. 1, the time slot of the channel on the highway 20 to which the DAA 13 sends data is the ch # 1 time slot in the normal time and when the telephone 2 is in the PSTN call. Even during a PSTN call, data can be sent onto the highway 20 at the same timing.

  The SLIC 12 is an interface unit that transmits and receives signals to and from the telephone 2 side, and a general subscriber circuit can be applied. In addition, the SLIC 12 periodically or constantly monitors the state of the telephone set 2 side, and when a call is received from the telephone set 2, gives a call connection control signal to the control unit 14. The SLIC 12 receives a response signal of an outgoing connection control signal or an incoming connection control signal from the control unit 14 and gives it to the telephone set 2 by predetermined communication control.

  The SLIC 12 directly transmits and receives audio signals to and from the DAA 13 via the highway 20 when the telephone 2 is in a PSTN call.

  The SLIC 12 includes a transmission timing control unit 12a, and transmits data to the highway 20 according to the time slot of the channel assigned on the highway 20. Further, as shown in FIG. 1, the time slot of the channel on the highway 20 to which the SLIC 12 sends data is the ch # 3 time slot in the normal time and when the telephone set 2 is in the PSTN call. Even during a PSTN call, data can be sent onto the highway 20 at the same timing.

  That is, during the PSTN call, there is no transmission path between the DSP 11 and the DAA 13 and SLIC 12, and data transmission from the DAA 13 and SLIC 12 via one highway 20 becomes an open drain, so the DAA 13 and the SLIC 12 Data can be directly transmitted between them.

(A-2) Operation of the First Embodiment Next, the operation of the voice communication device 1 of the present embodiment will be described with reference to the drawings. FIG. 7 is a flowchart for explaining the operation of the voice communication apparatus 1.

  In FIG. 7, the DAA 13 and the SLIC 12 regularly or constantly monitor whether there is an incoming call from the PSTN line 3 or a call from the telephone 2. In addition, the control unit 14 regularly or constantly monitors the DAA 13 and / or the SLIC 12 to monitor the presence / absence of incoming / outgoing calls (S1).

  When an incoming call from the PSTN line 3 or an outgoing call from the telephone 2 arrives at the voice communication apparatus 1, it is given to the control unit 14.

  At this time, a transmission path on the highway 20 is formed between the DSP 11, the DAA 13 and the SLIC 12, and the DTMF signal in the time order of the time slots of the channels (FIG. 1A) assigned to the highway 20 A modem signal is transmitted.

  When a control signal is given to the control unit 14, an incoming call from the PSTN line 3 or an outgoing call from the telephone 2 is detected (S2).

  In FIG. 7, incoming call detection from the PSTN line 3 or outgoing call detection from the telephone 2 is expressed as PSTN call incoming detection. If PSTN call arrival detection is not performed, the process returns to S2 to continue detection of PSTN call arrival.

  When the PSTN call arrival detection notification is given to the control unit 14, the control unit 14 detects that a PSTN call has been received, and the call control unit 142 performs call control between the PSTN line 3 and the telephone set 2. (S3).

  At this time, regarding the data transmission between the DSP 11 of the control signal related to the call control between the PSTN line 3 and the telephone set 2 by the call control unit 142 and the DAA 13 or the SLIC 12, the highway 20 has the channel shown in FIG. Is assigned to ch # 0 for data transmission from DSP11 to DAA13, ch # 1 for data transmission from DAA13 to DSP11, ch # 2 for data transmission from DSP11 to SLIC12, and data transmission from SLIC12 to DSP11. It is transmitted on ch # 3.

  When a call is started between the telephone set 2 and the PSTN line 3 by the call control unit 142 (S4), the highway 20 between the DSP 11 and the DAA 13 and SLIC 12 is controlled by the setting channel switching control unit 141 of the control unit 14. The upper channel setting is switched (S5).

  As a result, there is no transmission path between the DSP 11, the DAA 13 and the SLIC 12 via the highway 20, and there is only one highway 20, so that the data transmission timing in the DAA 13 and the SLIC 12 is not changed. ), The normal channel from the DAA 13 to the DSP 11 can be changed to the channel from the DAA 13 to the SLIC 12, and the normal channel from the SLIC 12 to the DSP 11 can be changed to the channel from the SLIC 12 to the DAA 13.

  While the telephone 2 is in a PSTN call, the audio signal is directly transmitted between the DAA 13 and the SLIC 12 via the highway 20.

  Even if the audio signal directly transmitted between the DAA 13 and the SLIC 12 includes an echo signal, if the delay amount between the audio signal and the echo signal of the audio signal is a minute time, the audio signal and the audio signal It is possible to transmit the signal without increasing the delay amount between the two echo signals. Thereby, it is possible to realize a call with high voice quality.

  Thereafter, when the PSTN call of the telephone 2 is terminated, the channel setting on the highway 20 is switched under the control of the setting channel switching control unit 141, and the transmission path between the DSP 11, the DAA 13 and the SLIC 12 is restored (S7). .

  Thereby, after the PSTN call of the telephone set 2 is completed, a transmission path between the DSP 11 and the DAA 13 and SLIC 12 can be formed again.

(A-3) Effects of the First Embodiment As described above, according to the present embodiment, the highway 20 between the DSP 11, the DAA 13, and the SLIC 12 is single, and when the PSTN call starts, the DAA 13 on the highway 20 By simply switching the transmission channel and the reception channel of the SLIC 12, it is possible to directly transmit voice data between the DAA 13 and the SLIC 12 without mediating the DSP 11.

  Thereby, high quality voice communication can be provided without loss of the echo signal or increasing the delay time between the voice signal and the echo signal. In addition, the delay of a general audio signal can be reduced.

(B) Second Embodiment Next, a second embodiment of the voice communication apparatus of the present invention will be described with reference to the drawings.

  In the present embodiment, a case will be described in which the present invention is applied to a voice communication apparatus that can be connected to at least a PSTN line and an IP network line and accommodates a telephone.

(B-1) Configuration of Second Embodiment FIG. 8 is a configuration block diagram showing a main hardware configuration of the voice communication device 10 of the second embodiment. FIG. 9 is a functional block diagram illustrating functions of the voice communication apparatus 10 according to the present embodiment.

  In FIG. 8, the components corresponding to those described in the first embodiment shown in FIG. Further, a detailed functional description of the corresponding configuration described in the first embodiment is omitted.

  In FIG. 8, the voice communication device 10 can be connected to the PSTN line 3 and the IP network line 4 and accommodates the telephone 2.

  Here, the IP network line 4 is, for example, a network whose communication protocol is IP, and can be widely applied to, for example, a dedicated network, a public network, a mobile communication network, and a network in which these are combined.

  Further, as shown in FIG. 8, the voice communication apparatus 10 includes at least a DSP 11, SLIC 12, DAA 13, WAN 16, and control unit 17 via a data bus 15.

  This embodiment is different from the first embodiment in that the voice communication apparatus 10 can be connected to an IP network line and the control function of the control unit 17. That is, in the present embodiment, when the telephone set 2 during a PSTN call is received from the IP network line 4, the transmission path between the DSP 11 and the SLIC 12 is disconnected, so that the incoming call is received from the IP network line. Since it may be assumed that the sound signal cannot be transmitted to the SLIC 12, it is considered that the incoming sound signal from the IP network line 4 can be transmitted to the SLIC 12.

  The WAN 16 is an interface unit that transmits and receives signals to and from the IP network line 4 side, and a general IP network line system circuit can be applied. The WAN 16 transmits the voice signal packetized by the control unit 17 to the IP network line 4. Further, the WAN 16 regularly or constantly monitors whether or not a signal is given from the IP network line 4, and gives a signal to the control unit 17 when a signal arrives from the IP network line 4.

  The control unit 17 includes at least a setting channel switching control unit 171, a call control unit 172, and an interrupt control unit 173. Of course, the control unit 17 has a basic control function as described in the first embodiment.

  The setting channel switching control unit 171 corresponds to the setting channel switching control unit 141 described in the first embodiment. The call control unit 172 also corresponds to the call control unit 142 described in the first embodiment.

  When the telephone 2 receives a call from the IP network line 4 during a PSTN call, the interrupt control unit 173 sets a channel for sending the ring tone signal to the SLIC 12 so that the ring tone signal created by the DSP 11 is sent to the highway. 20 is set, and the set channel is temporarily switched as a reception channel of the SLIC 12. As described above, the channel set by the interrupt control unit 173 is used as the reception channel of the temporary SLIC 12, and the ring tone signal is sent to the telephone set 2 via the SLIC 12 by transmitting the ring tone signal at the time slot timing of this channel. Is possible.

  Here, a setting example of channels set for the interrupt control unit 173 to transmit the ring tone signal will be described with reference to FIG. As shown in FIG. 10, the interrupt control unit 173 sets Ch # 4 on the highway 20 as a channel for transmitting a ring tone signal.

  In this way, the interrupt control unit 173 sets a channel different from the reception channel of the SLIC 12 (Ch # 1 in this embodiment) at the time of the PSTN call, and sets this channel as the reception channel of the temporary SLIC 12, A ring tone signal can be transmitted to the SLIC 12.

  The interrupt control unit 173 sets a channel on the highway 20 only when there is an incoming call from the IP network 4, but when there is no incoming call (for example, an interval period of the incoming call signal, the end of the incoming call signal, etc.) ) Returns to the channel assigned during PSTN call without switching the channel.

  As a result, only when an incoming call is received, a transmission path between the DSP 11 and the SLIC 12 can be formed using the set channel to transmit a ring tone signal to the SLIC 12. When the incoming call is not received, the channel during the PSTN call is set. It is possible to directly transmit an audio signal between the SLIC 12 and the DAA 13. When there is no incoming call, the transmission path between the DSP 11 and the SLIC 12 is disconnected.

  When the DSP 11 receives an incoming call from the IP network 4, the DSP 11 generates a ringing tone signal under the control of the interrupt control unit 173, and the generated ringing tone is temporarily transmitted to the highway 20 in the time slot of the assigned channel. To the SLIC 12.

(B-2) Operation | movement of 2nd Embodiment Next, operation | movement of the audio | voice communication apparatus 10 of 2nd Embodiment is demonstrated with reference to drawings.

  FIG. 11 is a flowchart for explaining the operation of the voice communication apparatus 10. In FIG. 11, the operations corresponding to those in the first embodiment shown in FIG. Further, detailed description of the operation described in the first embodiment is omitted.

  FIG. 12 is a connection sequence diagram of the voice communication apparatus 10. FIG. 12 shows a connection sequence when the telephone 2 receives an incoming call from the IP network line 4 during a PSTN call and gives a ringing tone signal to the telephone 2 to switch to the IP network line 4.

  In FIG. 11, the operation of the voice communication device 10 from S1 to S5 is the same as that in the first embodiment, and thus the description thereof is omitted.

  The WAN 16 periodically or constantly monitors the state of the IP network line 4 and when there is an incoming call from the IP network line 4, notifies the control unit 17 that the incoming call has been received, and the control unit 17 receives the incoming call from the IP network line 4. It is detected that there is (IP call incoming) (S10).

  At this time, incoming information is received by an IP packet. This mechanism is, for example, SIP, MGCP, H.264, or the like. According to the H.323 protocol.

  When an incoming IP call is detected by the control unit 17, a channel is temporarily allocated on the highway 20 under the control of the interrupt control unit 173, and the set channel is used as a reception channel of the SLIC 12 (S11). .

  Note that the control unit 17 monitors whether or not the telephone 2 is in a PSTN call. When the telephone 2 is in a PSTN call, the control unit 17 temporarily sets a transmission path between the disconnected DSP 11 and the SLIC 12. To recover automatically.

  When there is an incoming call from the IP network 4, the ring tone signal generated by the DSP 11 is placed on the channel set under the control of the interrupt control unit 173 and transmitted from the DSP 11 to the SLIC 12 (S 12).

  Thus, the ringing tone signal is given to the SLIC 12 through the channel set on the highway 20 and given to the telephone set 2.

  When a ring tone signal is given to the telephone set 2, a ring tone can be sent to the telephone set 2. Connection control with the line 4 is performed, and voice communication between the telephone set 2 and the IP network line 4 can be enabled.

(B-3) Effects of the Second Embodiment As described above, according to the present embodiment, the same effects as those of the first embodiment can be obtained.

  In addition, according to the present embodiment, when the telephone 2 receives an incoming call from the IP network line 4 during a PSTN call, the control unit 17 temporarily assigns a channel on the highway 20 only when the incoming call is received. Since a sound signal can be given to the SLIC 12, a ringing tone can be given to the telephone set 2 during a PSTN call.

(C) Other Embodiments In the first and second embodiments described above, the exchange and the VoIP gateway have been described as examples of the voice communication device. However, the voice communication device in the time division multiplexing transmission system system is In order to perform voice communication control, any voice communication apparatus provided with connection control means (DSP) that transmits data using a plurality of highways between interfaces can be widely applied.

It is explanatory drawing explaining the channel allocated to the highway which concerns on 1st Embodiment. It is a block diagram which shows the structure of the conventional audio | voice communication apparatus. It is explanatory drawing explaining the channel allocated to the highway of the conventional voice communication apparatus. It is explanatory drawing explaining a mode that the echo signal which generate | occur | produced in the conventional voice call enters into the transmission path | route of an audio | voice signal. It is a block diagram which shows the structure of the audio | voice communication apparatus of 1st Embodiment. It is a functional block diagram explaining the function of the audio | voice communication apparatus of 1st Embodiment. It is a flowchart explaining operation | movement of the audio | voice communication apparatus of 1st Embodiment. It is a block diagram which shows the structure of the audio | voice communication apparatus of 2nd Embodiment. It is a functional block diagram explaining the function of the voice communication apparatus of 2nd Embodiment. It is explanatory drawing explaining the channel allocated to the highway which concerns on 2nd Embodiment. It is a flowchart explaining the operation | movement of the audio | voice communication apparatus of 2nd Embodiment. It is a connection sequence diagram via the voice communication apparatus of the second embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 10 ... Voice communication apparatus, 11 ... DSP, 12 ... SLIC12 ... DAA, 14 ... Control part, 20 ... Highway.

Claims (3)

In a voice communication apparatus that is interposed between a telephone terminal to be accommodated and a communication network line and performs voice communication between the telephone terminal and the communication network line,
Line connection circuit means for connecting to the communication network line;
Terminal accommodating circuit means for accommodating the telephone terminal;
Connection control means for transferring time-division multiplexed data between the line connection circuit means and the terminal accommodating circuit means, and for controlling connection between the telephone terminal and the communication network line,
A voice communication apparatus characterized in that there is one time division multiplex transmission line for transmitting time division multiplexed data between said line connection circuit means, said terminal accommodating circuit means and said connection control means.   When voice communication is started between the telephone terminal and the communication network line, the setting channel of the time division multiplexing transmission line is switched, and voice data is directly transmitted between the line connection circuit means and the terminal accommodating circuit means. The voice communication apparatus according to claim 1, further comprising a channel switching control unit. A different network line connection circuit means for connecting to a different network line different from the communication network line;
The channel switching control means receives a ring tone received from the heterogeneous network line to the time division multiplex transmission line when the telephone terminal that has received an incoming call from the heterogeneous network line is performing voice communication with the communication network line. The voice communication apparatus according to claim 1 or 2, wherein a channel for transmitting a message to the telephone terminal is temporarily set.

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