JP2009246670A - Communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow data to hardly cause overlap or missing data even when a plurality of communication paths different in communication processing delay time are switched during communication in a communication apparatus capable of switching the plurality of communication paths during communication. <P>SOLUTION: In a dual-mode telephone apparatus 1, data are received from a communication partner while utilizing interfaces 21, 31 implementing communications to the same communication partner via different communication networks, and the data are output to a handset 42 (predetermined device). In accordance with a delay differential time obtained by detecting beforehand a differential of processing delay times until outputting the data transmitted from the communication partner to the handset 42 via the communication networks, respective output timings to output data to the handset 42 are matched with each other by a CPU 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication apparatus that realizes communication with a communication partner by switching a plurality of communication paths.

2. Description of the Related Art Conventionally, there is known a communication device that realizes communication with a communication partner by selecting a communication path via a wireless LAN or a wireless telephone network (for example, see Patent Document 1). In the communication device disclosed in Patent Document 1, the communication state (radio wave state) in the connected communication path is monitored, and when the communication state deteriorates, a process of switching to another communication path is performed.
JP 2006-005772 A

  By the way, when a communication device communicates with another device, a communication processing delay time corresponding to the communication path occurs. For this reason, in a configuration in which a plurality of communication paths are switched during communication, when there is a difference in processing delay time in the communication paths, there is a problem that duplication or omission occurs in switching the communication paths.

  Therefore, in view of such a problem, in a communication device capable of switching a plurality of communication paths during communication, even if a plurality of communication paths having a difference in communication processing delay time are switched during communication, data is duplicated. It is an object of the present invention to make it difficult for occurrence or omission.

  The communication apparatus according to claim 1, which is configured to achieve the above object, uses a first communication unit that specifies a communication partner and performs communication via a first communication network. When receiving data from the first communication means, the first output means for outputting the data to a predetermined device, and the second communication network different from the first communication network to the communication partner of the first communication means. When receiving data from the communication partner using the second communication means for performing the communication, the second output means for outputting the data to the predetermined device, and the first output according to an external command Switching means for selecting and switching the output from the means and the output from the second output means to be output to the predetermined device, the first output means and the second output means, Output data And a, a coherence control unit to match the output timing.

  In particular, the coincidence control means at least before the operation of the switching means, the time when the first output means outputs the data transmitted from the communication partner and the time when the second output means outputs the same data. The output means handles the data handled by the output means with respect to the output means that previously output data among the plurality of output means for the holding time set in accordance with the delay difference time in which the difference between the output and the pre-detected difference is detected. The first output means and the second output means output the data so that the output timings coincide with each other by causing the first output means and the second output means to output the data after the holding time. It is good to be configured.

  According to such a communication apparatus, the timing at which each output unit outputs data can be adjusted so that the processing delay times respectively generated by a plurality of communication networks coincide with each other. Even if the switching is performed, it is possible to prevent data loss or duplication from occurring at the time of switching.

  By the way, in the communication device according to claim 1, as described in claim 2, one of the communication networks is a public switched telephone network, and the other communication network is an Internet network. It is good to be.

  In general, when communication using the public switched telephone network is compared with communication using the Internet network, communication using the public switched telephone network has better communication quality and communication using the Internet network is cheaper. There is a feature. Therefore, according to such a communication apparatus, the communication network can be arbitrarily switched depending on which of the communication quality or the cost is given priority.

  Next, in the communication device according to claim 3, which is configured to achieve the above object, the communication partner is identified and connected to the communication network by the first method, and communication via the communication network is performed. When data is received from the communication counterpart using the first communication means to be implemented, the first output means for outputting the data to a predetermined device, and the first output to the communication counterpart of the first communication means. When data is received from the communication partner using the second communication means that is connected to the communication network by a second method different from the above method and performs communication via the communication network, the data is stored in the predetermined network. The second output means for outputting to the above device, and the switching means and the coincidence control means similar to those of the first aspect are provided.

  According to such a communication apparatus, the timing at which each output means outputs data can be adjusted so that the processing delay times respectively generated by a plurality of communication networks match, so that the switching means can communicate with the communication network during communication. Even if the connection method is switched, it is possible to prevent data loss and duplication.

  Further, in the communication device according to any one of claims 1 to 3, as described in claim 4, when the communication partner of each communication unit is changed, before the operation of the coincidence control unit, It is good to have the difference detection means which detects the delay difference time. In particular, the difference detection means measures the time from when any output means detects the specific data transmitted from the communication partner until the other output means detects the specific data. The delay difference time may be detected.

  According to such a communication device, since the delay difference time is detected every time the communication partner is changed, even if it is assumed that the processing delay time in communication differs for each communication partner, the matching control means Can match each output timing more accurately.

  Furthermore, in the communication apparatus according to any one of claims 1 to 4, as described in claim 5, at least communication quality in the communication means used by the output means selected by the switching means is detected. It is preferable to include communication quality detection means and switching command means for instructing the switching means to switch the output means in accordance with the communication quality detected by the communication quality detection means.

According to such a communication apparatus, the output means can be switched according to the communication quality.
As used herein, “communication quality” includes radio wave intensity and radio wave interference for wireless communication, packet loss frequency, packet processing delay time (line congestion), and the like for packet communication. Further, “according to the communication quality” means that the communication quality detection means detects only the communication state in the communication means that is currently being used (that is, the output means selected by the switching means), It is conceivable to change the handling depending on the case where the communication quality detection means also detects the communication state in the communication means not currently in use.

  For example, when the communication quality detection means detects only the communication state of the communication means currently in use, the switching instruction means selects the switching means if the communication quality is reduced (if it is less than a predetermined threshold). The output means may be changed. In addition, when the communication quality detection unit also detects a communication state in a communication unit that is not currently in use, the switching command unit may select an output unit that uses a communication unit with relatively good communication quality.

  Further, in the communication device according to any one of claims 1 to 4, as described in claim 6, switching for instructing the switching means to switch the output means at every preset time. Command means may be provided.

According to such a communication device, since the communication path is switched every predetermined time, it is possible to make it difficult for a third party to intercept the communication content by the communication device.
Furthermore, in the communication device according to any one of claims 1 to 6, as a specific aspect of the coincidence control means, as described in claim 7, the data is preceded by the plurality of output means. The output timing from the output means may be delayed by the delay difference time so that the output timings at which the first output means and the second output means output data coincide with each other.

According to such a communication apparatus, it is possible to prevent data from being lost or duplicated by a simple process.
The communication device according to any one of claims 1 to 7, wherein the output means includes a second storage means for storing data and the second storage means while aligning the data received via the communication means. And an alignment means for outputting the data stored in the second storage means after a predetermined processing time since the data is stored in the second storage means. As described in claim 8, before the switching means switches the output means, the processing time until the alignment means outputs the data accumulated in the second accumulation means is reduced to a shorter time. It is sufficient to change the output.

  According to such a communication apparatus, since the time until the alignment unit outputs the data stored in the second storage unit when the output unit is switched is shortened, the delay difference time can be shortened. Therefore, the output timing can be matched.

  Further, in the communication device according to claim 8, particularly when voice communication is performed, as described in claim 9, the coincidence control unit receives data received via the communication unit per unit time. It is preferable that the processing time is changed to a shorter time by repeatedly thinning out the prescribed data amount.

  According to such a communication device, since a predetermined amount of data is repeatedly thinned out per unit time, the processing time by the aligning means is reduced so as not to give a sense of incongruity to the user of the communication device when the amount of data is reduced. Can be changed shortly.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a dual mode telephone device 1 to which the present invention is applied. The dual-mode telephone device 1 is connected to a plurality of communication networks including a public switched telephone network (PSTN, hereinafter also referred to as “telephone network”) 50 and an Internet network 51. Communication with a communication device as a communication partner is performed via the network.

  In the first to third embodiments, the communication device of the communication partner will be described as having the same communication function as the dual mode telephone device 1. The dual-mode telephone device 1 also has a configuration for outputting voice input from the handset 42 (microphone) to any communication network. However, since this configuration is a well-known technique, the description is omitted. In the present embodiment, only the configuration for receiving audio will be described in detail.

  The dual mode telephone device 1 includes a CPU 11, a ROM 12, and a RAM 13 that function as a known microcomputer. Further, the dual mode telephone device 1 is configured to select and switch either the telephone network 50 or the Internet network 51 using the voice switching unit 41 (switching means) according to the communication network to be used. ing.

  Note that the telephone network 50 is a communication network that is charged according to the connection time, and the Internet network 51 is a communication network that is not charged according to the connection time. That is, if communication using only the Internet network 51 is performed, this means that communication can be performed at low cost for the user.

  Here, the CPU 11 processes the voice (data) received from each of the plurality of communication networks so that it can be output to the handset 42, and the voice input via the communication network selected by the voice switching unit 41. Only from the handset 42 (speaker) (first output means, second output means).

  A public telephone interface (I / F) 21 (first communication means), an A / D conversion unit 22, a digital processing unit 24, and a D / A conversion unit 25 are provided on the route from the telephone network 50 to the voice switching unit 41. Is provided. In addition, an Internet interface (I / F) 31 (second communication means), a digital processing unit 34, and a D / A conversion unit 35 are provided on the route from the Internet network 51 to the voice switching unit 41.

  The internet interface 31 includes a frame control unit 32 and a reception buffer unit 33. The digital processing units 34 and 64 include jitter buffer units 36 and 66 (second storage means).

  In the route from the telephone network 50 to the voice switching unit 41, the public telephone interface 21 functions as an interface for specifying a communication partner and performing communication via the telephone network 50, and receives the received voice signal (analog signal). The signal is amplified to an amplitude corresponding to the dynamic range of the A / D converter 22, and the A / D converter 22 converts the amplified signal into a digital signal. In the digital processing unit 24, the CPU 11 performs various known processes (echo cancellation processing, gain adjustment processing, filtering processing, etc.).

  In addition, the digital processing unit 24 includes a buffer (not shown: first storage unit), and the CPU 11 temporarily holds the data subjected to the above-described various processes in the buffer, and a delay time described later. After the delay time set in the setting process, the data held in the buffer is sent to the D / A converter 25. Then, the D / A conversion unit 25 converts the data into an analog signal and sends it to the voice switching unit 41 (coincidence control means).

  Next, on the route from the Internet network 51 to the voice switching unit 41, the CPU 11 receives a packet via the frame control unit 32 of the Internet interface 31 and stores this packet in the reception buffer unit 33. Then, the CPU 11 reads the packet from the reception buffer unit 33 and sends it to the digital processing unit 34. In the digital processing unit 34, various known processes (data compression and expansion processes, gain adjustment processes, filtering processes, etc.) are performed.

  The jitter buffer unit 36 in the digital processing unit 34 is provided to absorb so-called “fluctuation” such as packet delay and packet switching when data (packets) is transmitted through the Internet network 51. Yes. That is, the CPU 11 also stores the data handled by the digital processing unit 34 in the jitter buffer unit 36 while arranging them in the correct order, and performs a process of reading out after a predetermined time set to a time that can absorb fluctuation.

  Then, the CPU 11 sends the read data after performing various processes to the D / A converter 35, and the D / A converter 35 converts the data into an analog signal and sends it to the voice switching unit 41. In addition, the process by each component from each communication network to the voice switching unit 41 is performed as long as each interface 21 and 31 is connected to the communication network.

  In the dual-mode telephone device 1 configured in this way, the CPU 11 receives the same data (data having the same transmission timing and data having the same transmission timing) via different communication networks. Are made to coincide with the timings outputted by the D / A converters 25 and 35 in the respective paths. Then, even when the communication network is switched, control is performed so that missing or duplicated voice data does not occur (strictly speaking, it is difficult for the user to notice missing or duplicated voice data).

  Specifically, when the user makes a call, call processing as shown in FIGS. 2 and 3 is performed. 2 is a flowchart showing a call process performed by the CPU 11 in the first embodiment, FIG. 3A is a flowchart showing a telephone network connection process in the call process, and FIG. 3B is a call process in the call process. It is a flowchart which shows a delay time setting process.

  Here, in the call processing, the processing of S140 corresponds to the communication quality detection means in the present invention, and the processing of S150, S170, S320 to S340 corresponds to the switching command means. Moreover, the process of S210-S260 is corresponded to a switching command means.

  The call process is a process that is repeatedly activated when the dual mode telephone device 1 is powered on. Note that the dual-mode telephone device 1 is always connected to the communication partner via the Internet network 51 during a call, and even if the connection is cut off for some reason, the dual-mode telephone device 1 immediately performs a process of restoring the connection with the communication partner. Shall.

  As shown in FIG. 2, in the call processing, first, it is determined whether or not there is a call instruction by the user operating the operation unit (not shown) of the dual mode telephone device 1 or an incoming call from another communication device. (S110). If there is no call instruction or incoming call (S110: NO), the process of S110 is repeated.

  If there is a call instruction or an incoming call (S110: YES), a telephone network connection process, which is a process for connecting the dual mode telephone device 1 to the telephone network 50, is performed (S120). As shown in FIG. 3A, the telephone network connection process is performed differently depending on whether the dual mode telephone device 1 is a calling side or a receiving side.

  That is, if the dual-mode telephone device 1 is the calling party, first, a dial call is made to the telephone number set by the user (S510), and whether or not there is a confirmation signal from the receiving communication apparatus. Is confirmed (S520). If there is no confirmation signal (S520: NO), the process of S520 is repeated, and if there is a confirmation signal (S520: YES), the telephone network connection process is terminated.

  On the other hand, if the dual-mode telephone device 1 is the incoming side, it first connects to the calling side communication device (S560), and transmits a confirmation signal to the calling side communication device (S570). Here, the dual mode telephone device 1 transmits, for example, a polar response signal, which is a signal obtained by inverting the polarity of the line, as a confirmation signal, and the communication device on the calling side connects by detecting the presence or absence of this polar response signal. It is determined whether or not is established.

  When such telephone network connection processing is completed, a difference between a communication delay time (processing delay time) by the telephone network 50 and a communication delay time (processing delay time) by the Internet network 51 is detected, and digital processing is performed based on the difference. The delay time setting process (FIG. 2, S130) which is the process which sets the delay time by the part 24 is implemented. The delay time setting process is performed only when the dual-mode telephone device 1 and the communication device of the communication partner are connected to both the telephone network 50 and the Internet network 51, respectively. The delay time setting process corresponds to the difference detection means in the present invention.

  In the delay time setting process, the time (delay time) for holding data in the buffer of the digital processing unit 24 is set to 0 (or the shortest time), and each D / A conversion is performed from each digital processing unit 24, 34. This is performed while monitoring the data immediately before outputting the data to the units 25 and 35, respectively. Specifically, as shown in FIG. 3B, first, it is determined whether or not a part of the telephone network 50 that changes from silence to sound is detected (S610).

  Here, “silence” indicates that the level of the volume (amplitude) of the voice is less than a threshold set to a value corresponding to a level that cannot be heard by humans. Indicates that the level of loudness is equal to or greater than this threshold. When the delay time setting process is being performed, the dual mode telephone device 1 and the communication device of the communication partner intermittently transmit a signal sound for setting the delay time to each other. This processing may be performed by detecting it.

If a part changing from silence to sound is not detected (S610: NO), the process of S610 is repeated until a part changing from silence to sound is detected.
If a part that changes from silence to sound is detected (S610: YES), a delay timer that is a timer built in the CPU 11 is started (S620). Subsequently, it is determined whether or not a part that changes from silence to sound is detected in the Internet network 51 (S630). If a part changing from silence to sound is not detected (S630: NO), the process of S610 is repeated until a part changing from silence to sound is detected.

  If a part that changes from silence to sound is detected (S630: YES), the delay timer is stopped (S640), and the time of the delay timer at the time of stop is stored in the buffer of the digital processing unit 24. The time (delay time) is set (S650), and the delay time setting process is terminated. By this processing, the communication delay times in the route from each communication network to the voice switching unit 41 are matched.

  It is generally known that data received via the Internet network 51 has a longer communication delay time between data received via the telephone network 50 and data received via the Internet network 51. Therefore, in the delay time setting process, if the data received via the telephone network 50 is retained by the digital processing unit 24 by an extra delay time (difference in communication delay time), the communication delay times are matched. It can be done.

  When such a delay time setting process is completed, the process returns to FIG. 2 to detect the communication quality in each communication network (S140). Here, when determining the communication quality in this process, the frequency of data loss, the frequency of packet replacement, the presence or absence of sound (noise) outside the voice band, and the like are used.

  Subsequently, it is determined whether or not the communication quality of the Internet network 51 is good (S150). If the communication quality of the Internet network 51 is good (S150: YES), the operation mode is determined (S160). Here, the dual-mode telephone device 1 is configured so that either the cost priority mode or the eavesdropping prevention mode can be set in advance as an operation mode by a user's operation. Determine whether it is set.

  If it is set to the cost priority mode (S160: cost priority mode), a process of cutting off the connection with the telephone network 50 that charges for the communication time is performed. That is, the voice switching unit 41 selects the Internet network 51 (S170), and determines whether or not the connection between the dual mode telephone device 1 and the telephone network 50 is disconnected (S180).

  If the connection with the telephone network 50 is not disconnected (S180: NO), the connection with the telephone network 50 is disconnected (S190), and the process proceeds to S410, which will be described later. If the connection with the telephone network 50 is disconnected (S180: YES), the process immediately proceeds to S410, which will be described later.

  On the other hand, if the eavesdropping prevention mode is set in the process of S160 (S160: eavesdropping prevention mode), a preset time (switching time: every periodic time may be used or set using a random number or the like) A non-periodic time may be used.) Each time a plurality of communication networks are switched and used. Specifically, first, it is determined whether or not a switching timer that is a function of a timer built in the CPU 11 has already been started (S210).

  If the switching timer is not started (S210: NO), the switching timer is started (S220). Then, the voice switching unit 41 is made to select the Internet network 51 (S230), and the process proceeds to S240.

  Moreover, if the switching timer has already started (S210: YES), it will transfer to the process of S240 immediately. In the process of S240, it is determined whether or not an arbitrarily set switching time has elapsed after the switching timer is started (S240). If the switching time has elapsed (S240: YES), the voice switching unit 41 is made to select a communication network different from the currently selected communication network (S250), and the switching timer is reset (restarted) (S260). Then, the process proceeds to S410 described later.

If the switching time has not elapsed (S240: NO), the process immediately proceeds to S410.
By the way, if the communication quality of the Internet network 51 is poor in the process of S150 (S150: NO), it is determined whether or not it is connected to the telephone network 50 (S320). If not connected to the telephone network 50 (S320: NO), the telephone network connection process (calling side) described above is performed (S330), the voice switching unit 41 is selected (S340), and will be described later. The process proceeds to S410.

  If it is connected to the telephone network 50 (S320: YES), the voice switching unit 41 is immediately selected (S340), and the process proceeds to S410 described later. Subsequently, in the process of S410, it is determined whether or not the call is terminated (S410). That is, it is determined whether or not it has been detected that an end button (not shown) provided on the handset 42 has been pressed and that the handset 42 has been stored in a predetermined storage position.

  If the call has not ended (S410: NO), the processing from S140 is repeated. If the call has ended (S410: YES), the communication with the communication partner is disconnected (S420), and the call process ends.

  In the dual mode telephone device 1 described in detail above, the CPU 11 receives data from the communication partner using the public telephone interface 21 that identifies the communication partner and performs communication via the telephone network 50. Data is output to the handset 42 (predetermined device). Further, the CPU 11 receives data from the communication partner using the Internet interface 31 that performs communication via the Internet network 51 with the communication partner of the public telephone interface 21, and outputs this data to the handset 42. .

  Then, the CPU 11 stores data in the handset 42 according to the delay difference time in which the difference between the processing delay times until the data transmitted from the communication partner via each communication network is output by the handset 42 is detected in advance. The output timings for outputting are matched.

  Therefore, according to the dual mode telephone device 1 as described above, the processing delay times generated by the plurality of communication networks can be made to coincide with each other. Therefore, even when the voice switching unit 41 switches the communication network during communication, Data loss and duplication can be prevented.

Further, according to such a dual mode telephone device 1, the communication network can be arbitrarily switched depending on which of communication quality or cost is given priority.
Further, when the communication partner of each communication means is changed, the CPU 11 first performs a delay time setting process for detecting and setting a delay difference time.

  Therefore, according to such a dual mode telephone apparatus 1, since the delay difference time is detected every time the communication partner is changed, it is assumed that the processing delay time in communication is different for each communication partner. In addition, the CPU 11 can match each output timing more accurately.

  Further, when the cost priority mode is selected, the CPU 11 detects at least communication quality in the communication network used by the communication network selected by the voice switching unit 41 in the call processing, and according to the detected communication quality. Commands the voice switching unit 41 to switch the communication network.

According to such a dual mode telephone device 1, the communication network used for communication can be switched according to the communication quality.
Further, the CPU 11 instructs the voice switching unit 41 to switch the communication network every preset time.

  According to such a dual mode telephone device 1, the communication network (communication path) is switched every predetermined time, so that the communication content by the dual mode telephone device 1 can be made difficult to be intercepted by a third party.

  Further, in the dual mode telephone device 1, the CPU 11 matches the output timing in each communication network by delaying the output timing from the communication network having a short processing delay time among the plurality of communication networks by the delay difference time.

According to such a dual mode telephone device 1, it is possible to prevent data from being lost or duplicated by a simple process.
[Second Embodiment]
Next, another form of dual mode telephone device 2 (not shown) will be described. In the present embodiment (second embodiment), only the portions different from the dual mode telephone device 1 of the first embodiment will be described in detail, and the same portions as those described in the first embodiment will be denoted by the same reference numerals. Description is omitted.

  In the dual mode telephone device 2, the delay timer time is set as the delay time when setting the delay time in the digital processing unit 24 in the process of S650 in the delay time setting process (see FIG. 3B). Instead, a time obtained by subtracting 50 ms from the delay timer time is set as the delay time.

  In the call process (see FIG. 2), a process of shortening the buffer time in the jitter buffer unit 36 by 50 ms is performed before the process of S320. As a result, the communication delay time from each communication network to the voice switching unit 41 can be matched while shortening as much as possible. This process will be described with reference to FIG. FIG. 4 is a flowchart showing buffer size reduction processing executed by the CPU 11.

The buffer size reduction process will be described assuming that the communication time per packet is 10 ms and the process is completed in one second.
In the buffer size reduction process, first, since the buffer size is shortened by 50 ms, the number n of packets to be deleted is set to 5 (S710). Subsequently, n is decremented (S720), and a discard timer which is a function of the timer built in the CPU 11 is reset (restarted) (S730). Then, the first packet is selected (S740), and it is determined whether or not a packet loss has occurred by confirming that it is a serial number with the previously selected packet (S750).

  If no packet loss has occurred (S750: NO), it is determined whether this packet is a silent part (S760). If this packet is not a silent part (S760: NO), it is determined whether or not the delay timer has passed 200 ms (that is, 20 packets have already been selected) (S770).

  If 200 ms has not elapsed (S770: NO), the next packet is selected (S780), and the process returns to S750. If 200 ms has elapsed, the packet is forcibly discarded (S790), and the process proceeds to S820 described later.

  By the way, if a packet loss has occurred in the processing of S750 (S750: YES), this packet is discarded without making up for this packet (S800). If the packet is a silent part in S760 (S760: YES), the packet is discarded (S800).

  Then, similarly to the processing of S770, it is determined whether or not the delay timer time has passed 200 ms (S810). If 200 ms has not elapsed (S810: NO), the process of S810 is repeated, and if S200 ms has elapsed (S810: YES), the process proceeds to S820.

  In the process of S820, it is determined whether or not n = 0 (S820). If n = 0 is not satisfied (S820: NO), it is determined that it is necessary to repeatedly discard the packet, and the process returns to S720. If n = 0 (S820: YES), the buffer size reduction process is terminated, assuming that the packet has been discarded.

  By this processing, the buffer size can be shortened by 50 ms in 1 second. In this process, packet loss and silence are detected in this order, and if these are detected, data is thinned out. This is done in order to prevent the loss of many voiced parts by preferentially thinning out the missing part of the data itself and the silent part and not giving the user a sense of incongruity. is there.

  The dual mode telephone device 2 described above includes a reception buffer unit 33 that temporarily stores data received via the Internet network 51, and the CPU 11 performs a predetermined processing time after the data is stored in the reception buffer unit 33. Thereafter, the data is arranged from the reception buffer unit 33 in accordance with the output order set in advance for the data and output to the jitter buffer unit 36. Then, before the voice switching unit 41 switches the communication network, the CPU 11 changes the processing time until the data accumulated in the jitter buffer unit 36 is output to a shorter time and outputs it.

  According to such a dual mode telephone device 2, the time until the CPU 11 outputs the data stored in the jitter buffer unit 36 when switching the communication network is shortened, so that the output timing can be reduced while shortening the delay difference time. Can be matched.

  In addition, the dual mode telephone device 2 is configured to perform voice communication in particular, and the CPU 11 repeatedly reduces the received data to a specified amount of data per unit time, thereby shortening the processing time. Change to

  According to such a dual mode telephone device 2, since a predetermined amount of data is repeatedly thinned per unit time, the user of the dual mode telephone device 2 does not feel uncomfortable when the data amount is reduced. The processing time by the CPU 11 can be changed short.

  When the communication network to be used is switched from the telephone network 50 to the Internet network 51, after the switching, for example, by performing processing such as complementing one packet every 200 ms for one second, the jitter buffer 36 You may make it implement the process which returns a size to the original size.

[Third Embodiment]
Next, another mode of the dual mode telephone device 3 will be described. Also in the present embodiment (third embodiment), the same parts as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a block diagram showing a schematic configuration of the dual mode telephone device 3 of the third embodiment. In the dual mode telephone device 3 of the present embodiment, a different connection method is employed so that at least a part of the communication path differs from that of a single communication network (Internet network 51), instead of being configured to be connected to a plurality of communication networks. Connected by.

  That is, the dual mode telephone device 3 is replaced with the public telephone line interface 21, the A / D conversion unit 22, the digital processing unit 24, and the D / A conversion unit 25 in the dual mode telephone device 1 of the first embodiment. Similar to the interface 31, the digital processing unit 34, and the D / A conversion unit 35, the Internet interface 61 (the frame control unit 62 and the reception buffer unit 63), the digital processing unit 64 (including the jitter buffer unit 66), and the D / A A conversion unit 65 is provided.

  In this configuration, the dual mode telephone device 3 performs connection method 1 (communication using the Internet interface 31) and connection method 2 (communication using the Internet interface 61) in order to prevent eavesdropping. Realize communication with different headers. Even if at least one of the connection methods 1 and 2 is communication using a wireless LAN, an effect of preventing eavesdropping can be obtained.

  In the dual mode telephone device 3 configured as described above, processing as shown in FIGS. 6 and 7 is performed. FIG. 6 is a flowchart showing a call process executed by the CPU 11 in the third embodiment. FIG. 7 is a flowchart showing a delay time setting process in the third embodiment.

  As shown in FIG. 6, if there is a call instruction or an incoming call as shown in FIG. 6 (S110: YES), the above delay time setting process is immediately executed (S130), and then the communication quality by each communication method is detected. (S910). And it is determined whether the communication quality by each connection method is favorable (S920).

  If the communication quality is good (S920: YES), the processing from S210 onward is executed. However, instead of the process of S230, a process (S930) for selecting connection method 1 (or connection method 2 is also possible) is performed. Further, in place of the process of S250, a process (S950) of switching the currently used connection method to the other connection method is performed.

  If any one of the communication qualities of each connection method is poor (S920: NO), a communication method with a relatively good communication quality is selected (S940), and the processing after S410 described above To implement.

  Next, in the delay time setting process in the third embodiment, as shown in FIG. 7, first, the voice level included in the packet is detected at the same time by both connection methods, and silence is detected by either one of the connection methods. It is determined whether or not a site that changes to sound is detected (S960).

  If a part that changes from silence to sound is not detected (S960: NO), the process of S960 is repeated. If a part that changes from silence to sound is detected (S960: YES), a delay timer that is a timer built in the CPU 11 is started (S620).

  Subsequently, it is determined whether or not a part that changes from silence to sound is detected by the other connection method (S970). If a part changing from silence to sound is not detected (S970: NO), the process of S970 is repeated until a part changing from silence to sound is detected.

  Moreover, if the site | part which changes from silence to a sound is detected (S970: YES), the process below S640 will be implemented. In the process of S650, the data holding time in the jitter buffer units 36 and 66 on the side with the shorter communication delay time may be set to be longer by the delay timer time.

  In the dual mode telephone device 3 as described above, the CPU 11 specifies the communication partner and connects to the Internet interface 31 connected to the Internet network 51 by the first method, and the second method different from the first method. And an Internet interface 61 connected to the network 51.

  According to the dual mode telephone device 3 as described above, the data output timing can be adjusted so that the processing delay times respectively generated by a plurality of communication networks coincide with each other. Even if the connection method is switched, it is possible to prevent data loss or duplication.

[Other Embodiments]
Embodiments of the present invention are not limited to the above-described embodiments, and can take various forms as long as they belong to the technical scope of the present invention.

  For example, in the above embodiment, the “communication quality” in each communication network (a plurality of methods) is detected, but at least the communication quality in the communication network selected by the voice switching unit 41 is detected. Good. When detecting only the communication state in the currently used communication network in the call process, the CPU 11 determines that the voice switching unit 41 is in the call process if the communication quality is deteriorated (if it is less than a predetermined threshold). What is necessary is just to make it change the selected communication network (connection method).

  The delay time setting process for setting the delay time does not need to be performed in the communication process, and can be a process independent of the communication process. Furthermore, in the above-described embodiment, processing in a call has been described. However, the present invention is not limited to a call and can be applied to data communication such as image transfer (for example, streaming distribution).

It is a block diagram which shows schematic structure of the dual mode telephone apparatus 1 in 1st Embodiment. It is a flowchart which shows the telephone call process in 1st Embodiment. It is the flowchart (a) which shows the telephone network connection process in the telephone call process in 1st Embodiment, and the flowchart (b) which shows the delay time setting process in the telephone call process. It is a flowchart which shows the buffer size reduction process in 2nd Embodiment. It is a block diagram which shows schematic structure of the dual mode telephone apparatus 3 of 3rd Embodiment. It is a flowchart which shows the telephone call process in 3rd Embodiment. It is a flowchart which shows the delay time setting process in 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1-3 ... Dual mode telephone apparatus, 11 ... CPU, 12 ... ROM, 13 ... RAM, 21 ... Public telephone interface, 22 ... A / D conversion part, 24 ... Digital processing part, 25 ... D / A conversion part, 31 DESCRIPTION OF SYMBOLS ... Internet interface, 32 ... Frame control part, 33 ... Reception buffer part, 34 ... Digital processing part, 35 ... D / A conversion part, 36 ... Jitter buffer part, 41 ... Voice switching part, 42 ... Handset, 50 ... Telephone network , 51 ... Internet network, 61 ... Internet interface, 62 ... Frame control unit, 63 ... Reception buffer unit, 64 ... Digital processing unit, 65 ... D / A conversion unit, 66 ... Jitter buffer unit.

Claims (9)

First output means for outputting data to a predetermined device when data is received from the communication partner by using first communication means for specifying a communication partner and performing communication via the first communication network When,
When data is received from the communication partner using the second communication unit that performs communication via a second communication network different from the first communication network to the communication partner of the first communication unit, Second output means for outputting data to the predetermined device;
Switching means for selecting and switching which one of the output from the first output means and the output from the second output means is output to the predetermined device in response to an external command;
At least before the operation of the switching means, a difference between the time when the first output means outputs the data transmitted from the communication partner and the time when the second output means outputs the same data is detected in advance. For the output means that previously output data among the plurality of output means for the holding time set according to the delay difference time, the first storage means that the output means has for the data handled by the output means A coincidence control means for causing the first output means and the second output means to match data output timings by causing the first output means and the second output means to output data after the holding time,
A communication apparatus comprising: The communication apparatus according to claim 1, wherein one of the communication networks is a public switched telephone network, and the other communication network is an Internet network. When data is received from the communication partner using the first communication means that is connected to the communication network by the first method and that communicates via the communication network by specifying the communication partner, the data is stored in a predetermined manner. First output means for outputting to the device;
Utilizing second communication means connected to the communication network by a second technique different from the first technique for a communication partner of the first communication means and performing communication via the communication network Receiving data from the communication partner, a second output means for outputting the data to the predetermined device;
Switching means for selecting and switching which one of the output from the first output means and the output from the second output means is output to the predetermined device in response to an external command;
At least before the operation of the switching means, a difference between the time when the first output means outputs the data transmitted from the communication partner and the time when the second output means outputs the same data is detected in advance. For the output means that previously output data among the plurality of output means for the holding time set according to the delay difference time, the first storage means that the output means has for the data handled by the output means A coincidence control means for causing the first output means and the second output means to match data output timings by causing the first output means and the second output means to output data after the holding time,
A communication apparatus comprising: When the communication partner of each communication means is changed, before the operation of the coincidence control means, one of the output means detects specific data transmitted from the communication partner, and then the other output means The communication apparatus according to claim 1, further comprising a difference detection unit that detects the delay difference time by measuring a time until specific data is detected. Communication quality detection means for detecting communication quality in communication means used by at least the output means selected by the switching means;
Switching command means for commanding the switching means to switch the output means according to the communication quality detected by the communication quality detecting means;
The communication apparatus according to any one of claims 1 to 4, further comprising: The communication apparatus according to any one of claims 1 to 4, further comprising a switching command unit that commands the switching unit to switch the output unit at a preset time. The coincidence control means delays the output timing from the output means that output data first of the plurality of output means by the delay difference time, so that the first output means and the second output means receive data. Each output timing to output is made to correspond. The communication apparatus in any one of Claims 1-6 characterized by these. At least the output means that outputs data after the plurality of output means,
Second storage means for storing data;
The data received via the communication means is stored in the second storage means while being aligned, and after a predetermined processing time since the data is stored in the second storage means, the data stored in the second storage means is stored. Alignment means for outputting;
With
The coincidence control unit changes the processing time until the alignment unit outputs the data stored in the second storage unit before the switching unit switches the output unit, and outputs the data by changing the processing time to a shorter time. The communication device according to any one of claims 1 to 7, wherein 9. The coincidence control unit changes the processing time to a shorter time by repeatedly decimating a prescribed amount of data per unit time from the data received via the communication unit. The communication device described.

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