JP2004064408A - Transmitting device, receiving device, generating method and processing method for voice over internet protocol packet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent PB (pushbutton) sound from inappropriate reproduction at the receiving side because it is changed to a voice packet as a sound signal for transmission despite of being a PB sound signal. <P>SOLUTION: The receiving device comprises a VoIP (Voice over Internet Protocol) disassembling unit 38 for disassembling transmitted VoIP packets to analyze whether the VoIP packets contain PB code packets of encoded PB sound signals, a buffer 41 for temporarily accumulating PB code packets and/or voice packets before decoding, and a packet rewriting unit 42 for rewriting voice packets accumulated in the buffer 41 into PB code packets by a predetermined quantity if it is analyzed that the VoIP packets contain PB code packets. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention encodes a PB (Push Button) sound and voice and packetizes them to create a PB code packet and a voice packet, and transmits them as a VoIP (Voiceover IP) packet. The present invention relates to a VoIP packet receiving device that receives and decodes the VoIP packet, a VoIP packet generation method, and a VoIP packet processing method.
[0002]
[Prior art]
As a communication system, for example, as shown in FIG. 6, there is a system that performs communication via an IP (Internet Protocol) network 1.
[0003]
In this system, a router 2, a VoIP gateway 3 for converting voice into voice packets, a PBX (Private Branch Exchanger) 4 connected to the VoIP gateway 3, and a PBX 4 are connected to one side of the IP network 1. A plurality of ordinary telephones 5 and an IP telephone 10 directly connected to the router 2 are provided. On the other side of the IP network 1, a router 6, a VoIP gateway 30, a PBX 7 connected to the VoIP gateway 30, and a plurality of ordinary telephones 8 connected to the PBX 7 are provided. .
[0004]
As shown in FIG. 7, the IP telephone 10 includes a handset 10, a push button (PB) 12, a PB sound generator 13 that emits a PB sound signal in accordance with the operation of the PB 12, a handset 10 and a PB sound generator 13. A / D converter 147 for converting an analog signal from a digital signal into a digital signal, a PB detection unit 15 for detecting a PB sound signal, and a voice packet generated by compressing and encoding a voice signal from the handset 11, When a PB sound signal is detected by the detection unit 15, the PB sound signal is also compressed and coded to generate a PB code packet, and the four packets from the compression and coding unit 16 are combined into one. An IP packetizing unit 17 that collectively generates VoIP packets; an IP packet decomposing unit 18 that decomposes VoIP packets received from the outside; An expansion / decoding unit 19 for expanding / decoding the obtained PB code packet and voice packet and an interface 20 for communicating with the outside are provided.
[0005]
Further, the VoIP gateway 30 includes a terminal interface 31 on the PBX side, an A / D converter 32 for converting an analog signal from the terminal interface 31 into a digital signal, a PB detection unit 35 for detecting a PB sound signal, An audio signal from the terminal side interface is compressed and encoded to generate an audio packet, and when a PB sound signal is detected by the PB detection unit 35, the PB sound signal is also compressed and encoded to generate a PB code packet. An encoding unit 36; an IP packetizing unit 37 that combines the four packets from the compression / encoding unit 36 into one to generate a VoIP packet; and an IP packet decomposing unit 38 that decomposes a VoIP packet received from the outside. A decompression / decoding unit 39 for decompressing / decoding the PB code packet and the voice packet obtained by the decomposition, An IP network-side interface 40 to, and a.
[0006]
Assuming that the PB 12 is pressed during the telephone call of the IP telephone 10, a PB sound signal is generated from the PB sound generator 13, which is converted into a digital signal. To enter. When detecting the PB sound signal, the PB detection unit 15 instructs the compression / encoding unit 16 to convert the PB sound signal into a PB code packet. At this time, since the PB detection unit 15 has detected the PB sound for the first time after receiving the PB sound signal for a predetermined time or more, the PB sound signal input to the compression / coding unit 16 before the PB sound detection is , Are processed as voice signals, that is, converted into voice packets.
[0007]
Here, the PB sound signal converted into the voice packet will be specifically described with reference to FIG. In FIG. 8, the encoding interval in the compression / encoding unit 16 is 10 ms, the VoIP packet is a group of four voice packets and / or PB code packets, and the sending interval of the VoIP packet is 40 ms. And It is also assumed that the time from when the PB sound signal is input to the PB detection unit 15 until detection is 50 ms.
[0008]
Here, it is assumed that a PB sound signal is input to the PB detection unit 15 when the compression / encoding unit 16 sends out the packet B to the IP packetization unit 17. As described above, the PB detection unit 15 takes 50 ms from when the PB sound signal is input to when it is detected, so that after the PB sound signal is input, the compression / coding unit 16 and the PB detection unit 15 Even if the PB sound signals C, D, E, F, G, F, H,... Are sequentially input, the PB detection unit 15 outputs the signals C, D, E, F, G until immediately before the signal H is input. Cannot be detected as a PB sound signal. Therefore, the compression / encoding unit 16 processes the signals C, D, E, F, and G as audio signals even though the signals C, D, E, F, and G are PB audio signals, and converts these signals into audio packets C, D, and E, F, and G are converted.
[0009]
As described above, the IP packetizer 17 converts the packets BE from the compressor / encoder 16 into one VoIP packet in order to combine the four packets packetized by the compressor / encoder 15 into one VoIP packet. The packet is transmitted to the outside as one VoIP packet, and the packets F to I are transmitted to the outside as one VoIP packet. In this process, the packets H and I are packets output from the compression / encoding unit 16 after the detection of the PB sound signal, but since the four packets are combined, the packets H and I are also Like the previous packets F and G, they are collected as a bundle of audio packets. That is, after the PB sound signal starts to be input to the PB detection unit, seven PB sound signals are processed as the audio packets C to I.
[0010]
In the VoIP gateway 30 connected to the IP telephone 10 via the IP network 1 and the routers 2 and 6, when receiving the VoIP packet from the IP telephone 10, the IP packet decomposing unit 38 converts the VoIP packet into a voice packet. And PB code packets. In FIG. 8, the reception-side disassembly buffer is a buffer provided in the packet disassembly unit 38 of the VoIP gateway 30 and includes four packets transmitted from the IP network-side interface 40. This is a buffer having a capacity to store one VoIP packet. The decompression / decoding unit 39 of the VoIP gateway 30 converts the voice packet into a voice signal, sends this voice signal to the PBX via the A / D converter 32 and the terminal side interface 31, and converts the PB code packet into a PB sound. The PB sound signal is sent to a PB sound generator 33 via an A / D converter 32. When the PB sound generator 33 receives a PB sound signal for a fixed time, for example, 50 ms, it generates a PB sound corresponding to the PB sound signal, and outputs the PB sound via the terminal-side interface 31 to the PBX7. Send to In the case of the PBX 7, if the PB tone is the extension number of the ordinary telephone 5, a telephone line with the ordinary telephone 5 corresponding to the extension number is established.
[0011]
[Problems to be solved by the invention]
However, in the above-described conventional technology, seven (70 ms) PB sound signals, which should have been sent from the IP telephone 10 as PB code packets, are sent as voice packets (C to I). Therefore, there is a problem that the PB sound generation unit 33 of the VoIP gateway 30 cannot receive the audio signal for a predetermined time (50 ms) and does not emit the PB sound.
[0012]
The present invention focuses on such a problem of the related art, and a VoIP packet receiving apparatus, a VoIP packet transmitting apparatus, and a VoIP packet generation method capable of minimizing the non-generation of PB sound due to leakage of a PB sound signal. And a method for processing a VoIP packet.
[0013]
[Means for Solving the Problems]
A VoIP receiving apparatus for achieving the above object,
VoIP packet decomposing means for decomposing the VoIP packet and analyzing whether the PB code packet is included in the VoIP packet;
A buffer for temporarily storing the PB code packet and / or the voice packet obtained by the decomposition by the VoIP packet decomposing unit before being decoded;
When the VoIP packet decomposing means analyzes that the PB code packet is included in the VoIP packet, the packet rewriting means rewrites the voice packets stored in the buffer into PB code packets by a predetermined number. When,
It is characterized by having.
[0014]
Further, a VoIP packet transmitting apparatus for achieving the above object,
PB detection means for detecting a PB sound signal;
Encoding means for encoding an audio signal to convert it into an audio packet, and, when the PB sound signal detecting means detects the PB sound signal, encoding the PB sound signal to convert it into a PB code packet;
A predetermined number of the PB code packets or the voice packets are combined to generate a VoIP packet, and when the detection of the PB sound signal is received from the PB detection means, the PB sound is output even if the predetermined number of the voice packets are not collected. IP packetizing means for outputting the voice packets collected up to the point of receiving the signal detection as the VoIP packet;
It is characterized by having.
[0015]
Here, upon receiving the detection of the PB sound signal from the PB detection means, the IP packetizing means firstly receives the detection of the PB sound signal among the PB code packets from the encoding means. It is preferable that one PB code packet is output as a VoIP packet.
[0016]
Further, another VoIP packet transmitting apparatus for achieving the above-mentioned object,
PB detection means for detecting a PB sound signal;
Encoding means for encoding an audio signal to convert it into an audio packet, and, when the PB sound signal detecting means detects the PB sound signal, encoding the PB sound signal to convert it into a PB code packet;
A buffer for storing the PB sound signal at the preceding stage of the encoding means so that the PB sound signal is input to the encoding means with a certain time delay from the PB detection unit,
It is characterized by having.
[0017]
A method for processing a VoIP packet to achieve the above object is as follows.
A VoIP packet decomposing step of decomposing the VoIP packet and analyzing whether the PB code packet is included in the VoIP packet;
A buffering step of temporarily storing the PB code packet and / or the voice packet obtained by the decomposition by the VoIP packet decomposing means in a buffer before being decoded;
In the VoIP packet disassembly step, when it is analyzed that the PB code packet is included in the VoIP packet, the voice packets stored in the buffer are converted into the PB code packet by a predetermined number. A packet rewriting process for rewriting,
Which is characterized by having
[0018]
A method for generating a VoIP packet for achieving the above object is as follows.
A PB detection step of detecting a PB sound signal;
An encoding step of encoding the audio signal to convert it into an audio packet, and, when the PB audio signal is detected in the PB audio signal detecting step, encoding the PB audio signal and converting the PB audio signal into a PB code packet;
A predetermined number of the PB code packets or the voice packets are combined to generate a VoIP packet, and when the detection of the PB sound signal is received in the PB detection step, the PB code signal is output even if the predetermined number of the voice packets are not collected. An IP packetizing step of outputting the collected voice packets as a VoIP packet by the time when the detection of the sound signal is received;
Which is characterized by having
[0019]
Another method of generating a VoIP packet to achieve the above object is as follows.
A PB detection step of detecting a PB sound signal;
An encoding step of encoding the audio signal to convert it into an audio packet, and, when the PB audio signal is detected in the PB audio signal detecting step, encoding the PB audio signal and converting the PB audio signal into a PB code packet;
Before the PB sound signal is input to the encoding step, the PB sound signal is stored in the buffer for a predetermined time so that the PB sound signal is input to the encoding step after a certain time delay from the PB detection step. A buffering process;
An IP packetizing step of collecting the PB code packet or the voice packet obtained in the encoding step by a predetermined number and generating the VoIP packet;
Which is characterized by having
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, various embodiments of a communication system according to the present invention will be described with reference to the drawings.
[0021]
As described with reference to FIG. 6 in the “Prior Art” section, the communication system according to the present embodiment includes a router 2, a VoIP gateway 3 that converts voice into voice packets, and the like, on one side of the IP network 1. A PBX 4 connected to the VoIP gateway 3, a plurality of ordinary telephones 5 connected to the PBX 4, and an IP telephone 10a directly connected to the router 2 are provided. On the other side of the IP network 1, a router 6, a VoIP gateway 30a, a PBX 7 connected to the VoIP gateway 30a, and a plurality of ordinary telephones 8 connected to the PBX 7 are provided. .
[0022]
As shown in FIG. 1, the IP telephone 10a includes a handset 11, a PB 12, and a PB sound generator 13 that emits a PB sound signal in accordance with the operation of the PB 12, as in the conventional IP telephone 10 described with reference to FIG. An A / D converter 14 for converting an analog signal from the handset 11 and the PB sound generator 13 into a digital signal; a PB detector 15a for detecting the PB sound signal; A PB sound signal is detected by the PB detection unit 15a, and the PB sound signal is also compressed and coded to generate a PB code packet, and a compression / coding unit 16 An IP packetizing unit 17a that combines the four packets from 16 into one to generate a VoIP packet and an I packetizer that decomposes a VoIP packet received from the outside. A packet disassembling unit 18, and a decompression-decoding unit 19 for decompressing and decoding the PB code packet and the audio packet obtained by decomposition, an interface 20 for communicating with the outside. However, unlike the PB detection unit 15 of the related art, the PB detection unit 15a of the present embodiment notifies the detection of the PB sound signal to the IP packetization unit 17a together with the compression / encoding unit 16. When receiving the detection of the PB sound signal, the IP packetizing unit 17a does not collect four voice packets from the compression / coding unit 16, that is, even if only three or less voice packets are collected. The voice packet stored when the detection of the PB sound signal is received is output as a VoIP packet.
[0023]
As shown in FIG. 2, in the IP telephone 10a of the present embodiment, the encoding interval in the compression / encoding unit 16 is 10 ms. Further, as described above, the VoIP packet is a group of four voice packets and / or PB code packets, and the transmission interval of the VoIP packet is 40 ms. Also, the time from the first input of the PB sound signal to the PB detection unit 15a until detection is 50 ms.
[0024]
The VoIP gateway 30b connected to the IP telephone 10a via the IP network 1 and the routers 2 and 6 is similar to the conventional VoIP gateway 30 described with reference to FIG. An A / D converter 32 for converting an analog signal from the terminal-side interface 31 into a digital signal; a PB detection unit 35 for detecting a PB sound signal; A voice packet is generated, and when a PB sound signal is detected by the PB detection unit 35, the PB sound signal is also compressed and coded to generate a PB code packet. And an IP packetizing unit 37 that combines the four packets into one to generate a VoIP packet. An IP packet decomposing unit 38 for decomposing, an expansion / decoding unit 39 for decompressing and decoding PB code packets and voice packets obtained by the decomposition, and an IP network side interface 40 for communicating with the outside. . The VoIP gateway 30a of the present embodiment further includes a fluctuation absorbing buffer 41 that stores five PB code packets and voice packets obtained by the IP packet decomposing unit 38 decomposing the VoIP packet, that is, 50 ms, and this fluctuation. A packet rewriting unit that rewrites voice packets stored in the absorption buffer into PB code packets. Here, the capacity of the fluctuation absorbing buffer 41 is made to correspond to the detection time (50 ms) of the PB sound signal. However, as will be described later, the sound related to the six PB sound signals that leaks earlier due to the detection time of the PB sound signal. The capacity for storing packets, that is, the capacity for 60 ms may be used.
[0025]
Next, the operations of the IP telephone 10a as the VoIP packet transmitting device and the VoIP gateway 30a as the VoIP packet receiving device described above will be described with reference to FIG.
[0026]
Suppose that the PB 12 is pressed and the PB sound signal is input to the PB detection unit 15a when the compression / coding unit 16 sends out the packet B to the IP packetization unit 17a during the call of the IP telephone 10a. I do. As described above, the PB detection unit 15a takes 50 ms from the start of the input of the PB sound signal to the detection thereof. Therefore, after the input of the PB sound signal, the PB sound signal Even if the PB sound signals C, D, E, F, G, F, H,... Are sequentially input, the PB detection unit 15a keeps the signals C, D, E, F, G until immediately before the signal H is input. Cannot be detected as a PB sound signal. Therefore, the compression / encoding unit 16 processes the signals C, D, E, F, and G as audio signals even though the signals C, D, E, F, and G are PB audio signals, and converts these signals into audio packets C, D, and E, F, and G are converted.
[0027]
When the compression / encoding unit 16 receives the PB sound detection from the PB detection unit 15a, it converts the PB sound signals I, J,... After that point into PB code packets, and sends them to the IP packetizing unit 17a. .
[0028]
As described above, the IP packetizing unit 17a basically transmits the voice from the compression / encoding unit 16 in order to combine the four packets packetized by the compression / encoding unit 16 into one VoIP packet. The packets B to E are transmitted to the outside as one VoIP packet. However, when receiving the detection of the PB sound signal from the PB detection unit 15a, the IP packetizing unit 17a receives the detection of the PB sound signal even if four voice packets from the compression / coding unit 16 are not collected. And outputs the voice packet stored as a VoIP packet. Therefore, here, after transmitting the voice packets B to E to the outside as one VoIP packet, the three voice packets F, G, and H stored until the PB sound detection is transmitted to the outside as one VoIP packet. . When four PB code packets I, J,... Sequentially transmitted after the voice packet H from the compression / encoding unit 16 accumulate, the four PB code packets I to L are sent to the outside as one VoIP packet. Send. As a result, in the IP telephone 10a of this embodiment, six PB sound signals are processed as voice packets after the PB sound signal starts to be input to the PB detection unit 15a. The PB code packet (PB code packet I) is sent to the receiving side earlier by one PB code packet.
[0029]
In the VoIP gateway 30a connected to the IP telephone 10a via the IP network 1 and the routers 2 and 6, when receiving the VoIP packet from the IP telephone 10a, the IP packet decomposing unit 38 converts the VoIP packet into a voice packet. And PB code packets, and sequentially send them to the fluctuation absorbing buffer 41. When recognizing that the PB code packet is included in the VoIP packet in this decomposing process, the IP packet decomposing unit 38 notifies the packet rewriting unit 42 of the fact. Upon receiving this notification, the packet rewriting unit 42 rewrites the five voice packets C to G stored in the fluctuation absorbing buffer into PB code packets I to I at this time, and further rewrites the rewritten one after 10 ms. One PB code packet I is sent from the fluctuation absorbing buffer 41 to the decompression / decoding unit 39, and one voice packet H sent from the IP packet decomposing unit 38 to the fluctuation absorbing buffer 41 is rewritten into a PB code packet I. That is, the IP telephone 10a rewrites the voice packets C to H relating to the six leaked PB sound signals into PB code packets.
[0030]
The decompression / decoding unit 39 converts the audio packet from the fluctuation absorbing buffer 41 into an audio signal, and sends this audio signal to the PBX 7 via the A / D converter 32 and the terminal interface 31. The expansion / decoding unit 39 converts the PB code packet from the fluctuation absorbing buffer 41 into a PB sound signal, and sends this PB sound signal to the PB sound generator 33 via the A / D converter 32. When receiving the PB sound signal for 50 ms or more, the PB sound generator 33 generates a PB sound corresponding to the PB sound signal, and transmits the PB sound to the PBX 7 via the terminal-side interface 31. In the case of the PBX 7, if the PB tone is the extension number of the ordinary telephone 5, a telephone line with the ordinary telephone 5 corresponding to the extension number is established.
[0031]
As described above, in the present embodiment, the voice packets related to the six PB sound signals that have leaked earlier in the IP telephone 10a are rewritten into PB code packets on the receiving side, and the rewritten PB code packets and the retransmitted PB code packets are transmitted from the IP telephone 10a. Since the PB sound is generated based on the generated PB code packet, the non-generation of the PB sound due to the leakage of the PB sound signal can be prevented.
Next, a communication system according to a second embodiment of the present invention will be described with reference to FIGS.
[0032]
The communication system of the present embodiment is basically the same as the communication system of the first embodiment, except that the operation of the IP packetizing unit 17b of the IP telephone 10b and the downstream of the packet disassembling unit 38 of the VoIP gateway 30b. The difference from the first embodiment is that the fluctuation absorbing buffer 39 is not provided.
[0033]
When receiving the detection of the PB sound signal from the PB detection unit 15b, the IP packetizing unit 17b of the IP telephone 10b of the present embodiment converts the voice packet from the compression / encoding unit 16 into 4 as in the first embodiment. Even if it does not gather, the voice packet stored at the time when the detection of the PB sound signal is received is output as a VoIP packet. Further, the IP packetizing section 17b in this embodiment outputs only the first one PB code packet sent from the compression / encoding section 16 as a VoIP packet after receiving the detection of the PB sound signal.
[0034]
Accordingly, as shown in FIG. 4, the IP packetizing unit 17b transmits the voice packets BE from the compression / coding unit 16 to the outside as one VoIP packet, and detects the PB sound signal from the PB detecting unit 15b. Then, even if four voice packets from the compression / encoding unit 16 are not collected, the voice packets F, G, and H stored at the time of receiving the detection of the PB sound signal are sent to the outside as one VoIP packet. Send. Further, only the first one PB code packet I sent from the compression / encoding unit 16 after the detection of the PB sound signal is transmitted to the outside as a VoIP packet. For this reason, in this embodiment, since it does not wait until four PB sound code packets gather like the prior art, the PB code packet is sent to the outside earlier by four PB code packets than the prior art. Become.
[0035]
In the VoIP gateway 30b connected to the IP telephone 10b via the IP network 1 and the routers 2 and 6, when receiving the VoIP packet from the IP telephone 10b, the IP packet decomposing unit 38 converts the VoIP packet into a voice packet. Or PB code packets, and sequentially sends them to the decompression / decoding unit 39. When recognizing that the PB code packet is included in the VoIP packet in this decomposing process, the IP packet decomposing unit 39 notifies the packet rewriting unit 42b of the fact. Upon receiving this notification, the packet rewriting unit 42 rewrites the voice packet stored in the buffer provided in the IP packet decomposing unit 38 into a PB code packet at this time. Here, since the IP packet disassembly unit 38 needs to accept a VoIP packet including four PB code packets or four voice packets, the buffer of the IP disassembly packet unit 38 at least stores the PB code packet or the voice packet. Four or more can be stored. Therefore, when the IP packet decomposing unit 38 receives the VoIP packet including the PB code packet I, at least three voice packets F, G, and H are stored in the buffer of the IP packet decomposing unit 38. Will be. Therefore, when the IP packet decomposing unit 38 identifies the PB code packet from the IP header, and the packet rewriting unit 42 receives a notification that the PB code packet is included from the IP packet decomposing unit 38, The three voice packets F, G, and H stored in the buffer of the unit 38 are rewritten to PB code packets I, I, and I. That is, the IP telephone rewrites the voice packets F, G, and H among the voice packets C to H relating to the six leaked PB sound signals to PB code packets.
[0036]
The decompression / decoding section 39 converts the voice packet from the IP packet decomposing section 38 into a voice signal as in the first embodiment, and converts the voice signal via the A / D converter 32 and the terminal-side interface 31. To the PBX 7, converts the PB code packet from the IP packet decomposing unit 38 into a PB sound signal, and sends this PB sound signal to the PB sound generator 33 via the A / D converter 32. When receiving the PB sound signal for 50 ms or more, the PB sound generator 33 generates a PB sound corresponding to the PB sound signal, and transmits the PB sound to the PBX 7 via the terminal-side interface 31.
[0037]
As described above, in the present embodiment, of the six voice packets related to the PB sound signal leaked earlier by the IP telephone 10a, three voice packets are rewritten into PB code packets, and the rewritten PB code packet and the IP telephone 10a are rewritten. Since the PB sound is generated based on the PB code packet transmitted from the PB code packet, it is possible to minimize the non-generation of the PB sound due to the leakage of the PB sound signal. Further, in the present embodiment, since no fluctuation absorbing buffer is provided between the IP packet decomposing unit 38 and the decompression / decoding unit 39, the memory can be effectively used, and the existence of the fluctuation absorbing buffer can be improved. Can be avoided.
[0038]
Next, a third embodiment of the communication system according to the present invention will be described with reference to FIG.
[0039]
The IP telephone 10c of the present embodiment has a pre-stage buffer 21 provided before the compression / encoding unit 16, and the other configuration of the IP telephone 10c is the same as that of the second embodiment.
[0040]
The capacity of the front-stage buffer 21 is a capacity that can store the six PB sound signals C to H that leak earlier in the second embodiment. The PB sound signal from the PB sound generator 13 is input to the compression / encoding unit 16 via the pre-stage buffer 21 and is input to the PB detection unit 15b without passing through the pre-stage buffer 21. Therefore, the PB signal is input to the compression / encoding unit 16 later than the PB detection unit 15 b by the capacity of the preceding buffer 21. For this reason, as shown in FIG. 2, when the PB sound signals C, D, E,... Are input to the PB detection unit 15b, the compression / coding unit 16 outputs the PB sound signals C, D, E,. Are not input, and when the PB detection unit 15b detects the PB sound signal H, the PB sound signals C, D, E,... For this reason, the signals input as the PB sound signals C, D, E,... To the compression / encoding unit 16 are detected as PB sound signals when they are input. Unlike PB code packets, all are converted to PB code packets C, D, E,.
[0041]
As described above, in the present embodiment, since the PB sound signal does not leak earlier in the IP telephone 10c, it is possible to prevent non-generation of the PB sound due to the leakage of the PB sound signal.
[0042]
In each of the above embodiments, an IP telephone has been described as an example of the VoIP packet transmitting apparatus. However, the present invention is not limited to this, and PB sound signals and voice signals are packetized, and these are collectively collected. The present invention may be applied to any device as long as it is transmitted to the outside as a VoIP packet. For example, the present invention is applied to a VoIP gateway shown in FIG. 6 or a PBX having the function of the VoIP gateway. You may. Further, in each of the above embodiments, the VoIP gateway has been described as an example of the VoIP packet transmission / reception. However, the VoIP packet in which the PB code packet and the voice packet are combined is received and decoded. If so, the present invention may be applied to any device. For example, the present invention may be applied to a PBX having a VoIP gateway function.
[0043]
【The invention's effect】
According to the VoIP packet receiving apparatus according to the present invention, the voice packet related to the PB sound signal leaked by the VoIP transmitting apparatus is rewritten into the PB code packet, and the rewritten PB code packet and the PB code transmitted from the VoIP packet receiving apparatus are rewritten. Since the PB sound is generated based on the packet, non-generation of the PB sound due to leakage of the PB sound signal can be minimized.
[0044]
Further, according to the VoIP packet transmitting apparatus according to the present invention, a buffer for storing the PB sound signal for a certain time is provided before the encoding means, and it takes a certain time from the input of the PB sound signal to the detection thereof. Since the PB sound signal is input to the encoding means at a certain time later than the PB detection means, the PB sound signal is input to the encoding means after the PB signal is detected by the PB detection means. Thus, it is possible to prevent the PB sound signal from being leaked, in which the encoding means processes the PB sound signal as a voice packet, and as a result, it is possible to prevent the PB sound from not being generated.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of an IP telephone and a VoIP gateway in a communication system according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram showing processing contents of a packet on a packet sending side and a packet on a receiving side in the first embodiment according to the present invention.
FIG. 3 is a functional block diagram of an IP telephone and a VoIP gateway in a communication system according to a second embodiment of the present invention.
FIG. 4 is an explanatory diagram showing processing contents of a packet on a packet sending side and a packet on a receiving side in a second embodiment according to the present invention.
FIG. 5 is a functional block diagram of an IP telephone and a VoIP gateway in a communication system according to a third embodiment of the present invention.
FIG. 6 is a system diagram of a communication system.
FIG. 7 is a functional block diagram of an IP telephone and a VoIP gateway in a conventional communication system.
FIG. 8 is an explanatory diagram showing processing contents of a packet on a conventional packet sending side and a packet on a receiving side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... IP network, 10, 10a, 10b, 10c ... IP telephone, 11 ... Handset, 12 ... PB, 13, 33 ... PB sound generator, 15, 15a, 15b, 35 ... PB detector, 16, 36 ... Compression Encoding units, 17, 17a, 17b, 37: IP packetizing units, 18, 38: IP packet decomposing units, 19, 39: Decompression / decoding units, 41: Fluctuation absorption buffers, 42, 42b: Packet rewriting units , 30, 30a, 30b ... VoIP gateway.

Claims (8)

A VoIP (Voice over Internet Protocol) packet including a PB (Push button) audio signal and a PB code packet obtained by encoding a sound signal and / or an audio signal obtained by encoding an audio signal is received. In a VoIP packet receiving device for decoding the VoIP packet,
VoIP packet decomposing means for decomposing the VoIP packet and analyzing whether or not the PB code packet is included in the VoIP packet;
A buffer for temporarily storing the PB code packet and / or the voice packet obtained by the decomposition by the VoIP packet decomposing means before the decoding;
When the VoIP packet decomposing means analyzes that the PB code packet is included in the VoIP packet, the packet rewriting means rewrites the voice packets stored in the buffer into PB code packets by a predetermined number. When,
A VoIP packet receiving device comprising: A VoIP (Voice over Internet Protocol) packet is generated by combining a predetermined number of PB code packets obtained by coding a push button (PB) sound signal or voice packets obtained by coding a voice signal, and the generated VoIP packet is transmitted to the outside. In the VoIP packet transmitting device that performs
PB detection means for detecting the PB sound signal;
Encoding means for encoding the audio signal and converting it to the audio packet, and when the PB sound signal detection means detects the PB sound signal, encoding means for encoding the PB sound signal and converting it to the PB code packet;
The PB code packet or the voice packet is combined with the predetermined number to generate a VoIP packet, and when the detection of the PB sound signal is received from the PB detection unit, the PB code packet is output even if the voice packet does not reach the predetermined number. IP packetizing means for outputting, as the VoIP packet, the voice packets collected up to the time when the detection of the sound signal is received;
A VoIP packet transmitting device comprising: The VoIP packet transmitting device according to claim 2,
Upon receiving the detection of the PB sound signal from the PB detection means, the IP packetizing means may receive the first one of the PB code packets from the encoding means from the time of receiving the detection of the PB sound signal. Outputting the PB code packet as a VoIP packet,
A VoIP packet transmitting device characterized by the above-mentioned. A VoIP packet transmission for generating a PB (Push button) sound signal encoded PB code packet or a VoIP (Voice over IP) packet including an audio signal encoded audio signal, and transmitting the generated VoIP packet to the outside. In the device,
PB detection means for detecting the PB sound signal;
Encoding means for encoding the audio signal and converting it to the audio packet, and when the PB sound signal detection means detects the PB sound signal, encoding means for encoding the PB sound signal and converting it to the PB code packet;
A buffer for storing the PB sound signal in the preceding stage of the encoding means so as to input the PB sound signal to the encoding means with a certain time delay from the PB detection means,
A VoIP packet transmitting device comprising: A VoIP (Voice over Internet Protocol) packet including a PB (Push button) audio signal and a PB code packet obtained by encoding a sound signal and / or an audio signal obtained by encoding an audio signal is received. In a VoIP packet processing method for decoding the VoIP packet,
A VoIP packet decomposing step of decomposing the VoIP packet and analyzing whether or not the PB code packet is included in the VoIP packet;
A buffering step of temporarily storing the PB code packet and / or the voice packet obtained by the decomposition by the VoIP packet decomposing means in a buffer before the decoding;
If it is determined in the VoIP packet disassembly step that the PB code packet is included in the VoIP packet, the voice packets stored in the buffer are rewritten to the PB code packet by a predetermined number. Packet rewriting process,
A method of processing a VoIP packet, comprising: A predetermined number of PB code packets obtained by encoding a PB (Push Button) sound signal or audio packets obtained by encoding an audio signal are collected, and the predetermined number of PB code packets or the voice over Internet including the predetermined number of audio packets are included. Protocol) for generating a VoIP packet for generating a packet.
A PB detection step of detecting the PB sound signal;
Encoding the audio signal and converting it to the audio packet, and, when the PB audio signal is detected in the PB audio signal detection step, encoding the PB audio signal and converting it to the PB code packet;
The PB code packet or the voice packet is collected by the predetermined number to generate a VoIP packet, and when the detection of the PB sound signal in the PB detection step is received, even if the voice packet does not reach the predetermined number, the An IP packetizing step of outputting the collected voice packets as a VoIP packet by the time the detection of the PB sound signal is received;
A method for generating a VoIP packet, comprising: The method for generating a VoIP packet according to claim 6,
In the IP packetizing step, when the detection of the PB sound signal in the PB detecting step is received, the PB code signal obtained in the encoding step is first received from the point in time at which the detection of the PB sound signal is received. Output one PB code packet as a VoIP packet,
A method for generating a VoIP packet. A predetermined number of PB code packets obtained by encoding a PB (Push Button) sound signal or audio packets obtained by encoding an audio signal are collected, and the predetermined number of PB code packets or the voice over Internet including the predetermined number of audio packets are included. Protocol) for generating a VoIP packet for generating a packet.
A PB detection step of detecting the PB sound signal;
Encoding the audio signal and converting it to the audio packet, and, when the PB audio signal is detected in the PB audio signal detection step, encoding the PB audio signal and converting it to the PB code packet;
Before the PB sound signal is input to the encoding step, the PB sound signal is stored in the buffer for a predetermined time so that the PB sound signal is input to the encoding step after a certain time delay from the PB detection step. A buffering process;
An IP packetizing step of collecting the PB code packet or the voice packet obtained in the encoding step by the predetermined number and generating the VoIP packet;
A method for generating a VoIP packet, comprising:

Images