CN1336752A

CN1336752A - IP telephone of wideband IP network

Info

Publication number: CN1336752A
Application number: CN 00119543
Authority: CN
Inventors: 郭阅仑; 高汉中; 李琪; 陆奕奕
Original assignee: SHANGHAI LONGLIN COMMUNICATION TECHN CO Ltd
Current assignee: SHANGHAI LONGLIN COMMUNICATION TECHN CO Ltd
Priority date: 2000-08-01
Filing date: 2000-08-01
Publication date: 2002-02-20

Abstract

The invention provides an IP telephone on wide band IP network which can ensure high communication quality and reduce the expenses. Said IP telephone comprises earphone, faceplate, sampling module used to transform analog signal into digital signal, didital/alaog signal transforming module used to transform digital signal into analog signal, simulated ringing and dialing voice module used to generate anolog audio signals of ringing, dialing and busy tone, audio compressing and decomprising module used to do full duplex audio compression and decompression, protocol signalling control module used to exchange communication agreenment and signalling with called party and set communication process, network interface module used to connect with IP network and IP packing and unpacking module used to packing or unpacking.

Description

The IP phone of wideband IP network

The present invention relates to a kind of IP phone that is used for wideband IP network.

Present IP phone grows up on the arrowband IP network.It utilizes the IP phone gateway, the plain old telephone conversion of signals is become the IP packet after, on IP network, transmit.Because IP phone converts analogue voice signal to the IP packet, transmits on IP network, the conventional telecommunications net is not monopolized a talk channel like that for another example, thereby the expense of IP toll telephone is declined to a great extent.

But along with the popularizing of the range of application of IP phone, user's increase and developing rapidly of multiple business, the shortcoming of the IP phone of arrowband IP network itself reveals day by day.

At first, in the IP phone of arrowband IP network, when making a phone call, still need dial plain old telephone earlier,, send through IP network again by the processing of service provider by gateway to IP phone service provider owing to the user.This mode has in fact just been utilized IP network in the main line part, and the user still needs to use plain old telephone, so IP phone expense cheap advantage in arrowband just just embodies in toll telephone.

Secondly, because the fast development of communications industry in recent years, telephone subscriber and business rise year by year, and present arrowband IP network can't bear the heavy load to the growing of data flow, and consequently the speech quality of this IP phone is inferior to plain old telephone, make the user be difficult to accept.

Meanwhile, development of internet technology is just promoting the construction of network infrastructure, can carry out the different types of data transmission simultaneously, wideband IP network with high speed data transfer ability comes into effect in comprising many countries of China, correspondingly produced multiple consumer wideband IP access way, this will provide the good basis environment for the high-quality IP phone that is better than plain old telephone tonequality.

The objective of the invention is,, provide a kind of high-quality IP phone of wideband IP network of novelty at the problems referred to above that the IP phone of arrowband IP network exists.

The IP phone of wideband IP network of the present invention comprises: the microphone that is used to gather voice signal, be used to play the earphone of voice signal, be used to provide the panel of functions such as dialing, this IP phone also comprises: sampling module, be connected with described microphone, being used for the voice signal from microphone is digital signal by analog signal conversion; The D/A switch module is connected with described earphone, will be converted to analog signal from the digital signal of described IP network; Simulation ring dialing tone module is connected with described earphone and described panel, is used to produce simulated audio signals such as ring back tone, dialing tone, busy tone; The compressing and decompressing audio file module is connected with described sampling module, described D/A switch module, is used to carry out the full-duplex audio compression, decompresses; The protocol signaling control module is connected with described panel, described D/A switch module, described simulation ring dialing tone module, is used for and callee's switched communication agreement, and signaling is set up communication process; Network Interface Module is used for being connected with outside IP network; The IP parse module of packing, be connected with described compressing and decompressing audio file module, described protocol signaling control module and described Network Interface Module, be used for to become from the data encapsulation of described compressing and decompressing audio file module the IP bag, or will open from the IP bag of described Network Interface Module, and judged, if packets of audio data then sends to described compressing and decompressing audio file module, if signaling, agreement then send to described protocol signaling control module.

According to the IP phone of wideband IP network of the present invention, no longer need the processing of IP phone service provider, avoided in the IP phone of arrowband IP network owing to need in local telephone, can't embody the problem of low price by the processing of gateway through service provider; And utilize broadband connections intermediate-frequency bandwidth, characteristics that transmittability is strong, avoided the adverse effect of the growth of communication data flow speech quality.

From with reference to the accompanying drawings, in the more detailed description that embodiments of the invention are carried out, can further understand the present invention.

Fig. 1 is the structured flowchart according to the IP phone of the wideband IP network of the first embodiment of the present invention;

Fig. 2 is the work exemplary view of two IP phone as shown in Figure 1.

Fig. 1 is the structured flowchart of the IP phone of wideband IP network of the present invention.As shown in the figure, IP phone 1 comprises: be used to gather the microphone 111 of speech, it has good frequency response characteristic; Be used for the earphone 112 of voice played, have good frequency response characteristic equally; Panel 113 is made of section dialing in 113a, control section 113b and liquid-crystal display section 113c, is used to provide dialing, retransmits, adds spoon, functions such as dialing tone and ring, control volume, demonstration caller ID; In addition, also comprise: sampling module 114a, be connected with microphone 111, being used for the voice signal from microphone 111 is digital signal by analog signal conversion, wherein, sample frequency for example is 32KHz, can obtain the optimum performance price ratio of voice compression; D/A switch module 114b is connected with earphone 112, will be converted to analog signal from the digital signal of IP network, reproduces the speech of partner then by earphone 112; Simulation ring dialing tone module 115 is connected with earphone 112 and panel 113, is used to produce simulated audio signals such as ring back tone, dialing tone, busy tone; Compressing and decompressing audio file module 116, be connected with sampling module 114a, D/A switch module 114b, carry out audio compression, the decompression work of full duplex (can receive simultaneously and launch) by DSP (digital signal processing chip), its compression algorithm is ISO/IFC 11172-3; Protocol signaling control module 117 is connected with panel 113, D/A switch module 114b, simulation ring dialing tone module 115, is used for and the other side's switched communication agreement, signaling, sets up communication process; Network Interface Module 119 can connect ADSL (Digital Subscriber Loop), HFC (hybrid fiber/ coax, HFC) or Ethernet, decides on the IP network user mode access; The IP parse module 118 of packing, be connected with compressing and decompressing audio file module 116, protocol signaling control module 117 and Network Interface Module 119, be used for to become from the data encapsulation of compressing and decompressing audio file module 116 the IP bag, add source address, behind the destination address of protocol signaling control module 117 acquisitions, receive Network Interface Module 119, or the other side IP bag of automatic network interface module 119 is opened in the future, and judged, if packets of audio data, then send to compressing and decompressing audio file module 116, if signaling, agreement then send to protocol signaling control module 117.

Below with reference to Fig. 2, the working condition of explanation when two IP phone 1 and 2 are as shown in Figure 1 conversed.

As shown in Figure 2, when by IP phone 1 caller, 115 dialing tones of simulation ring dialing tone module behind the off-hook, the calling subscriber is by section dialing in 113a dialing, and after dialing finished, the institute that 117 pairs of protocol signaling control modules are sent to this module dialled the number and handles, and deliver to IP packing parse module 118 and pack, add source address, destination address, by Network Interface Module 119, send to the other side's phone then through IP network.This moment the other side protocol signaling control module 217 will with our protocol signaling control module 117 switched communication agreements, signaling.When the other side's protocol signaling control module 217 judges that this moment is just busy, 215 busy tones of its simulation ring dialing tone module, and this busy tone is sent to calling party's protocol signaling control module 117 by its IP packing parse module 218, Network Interface Module 219, simultaneously, it also by control panel 213, shows phone incoming call and caller ID on LCDs 213c; If the other side's protocol signaling control module 217 judges that this moment is idle, then it will finish protocol handshake with dialing party protocol signaling control module 117, set up communication process, 215 ring back tones of protocol signaling control module 217 control simulation ring dialing tone modules, LCDs 213 shows caller ID, behind IP phone 2 off-hooks, begin conversation.At this moment, caller IP phone 1 side's speech is sent to sampling module 114a by 111, sample and mould/number conversion, digital signal after the conversion is compressed according to the ISO/IFC11172-3 compression algorithm by compressing and decompressing audio file module 116, and be sent to IP packing parse module 118 and be packaged into the IP bag, add source address and destination address,, send to the other side through IP network by Network Interface Module 119.The signal of sending to the other side is the digital signal after handling through mould/number conversion, compression, packing etc., in order to make IP phone 2 sides hear IP phone 1 side's speech, also need by packing parse module 218, the compressing and decompressing audio file module 216 of the IP in IP phone 2 side's IP phone and D/A switch module 214b unpacks successively, decompression and D/A switch, be reduced to voice signal and be sent to earphone 212.After both call sides had side's on-hook, this side's protocol

signaling control module

117 or 217 was sent end data packet, sign off.

Otherwise when by IP phone 2 side's callers, its process is with above-mentioned similar.

Sampling rate of the present invention is brought up to 32KHz by the 8KHz of plain old telephone, thereby audio bandwidth is expanded to about 15KHz.Meanwhile, the voice data of employing compression coding and decoding technology is arranged, make the data rate of high-quality IP phone still remain 64Kbps, identical with the data rate of plain old telephone, only take the minimum part of wideband IP network bandwidth, and no longer pass through PSTN, thus not only obtained to be better than the tonequality of plain old telephone, and further reduced cost of the phone call.

Though with reference to accompanying drawing, embodiments of the invention and working condition thereof are described, those of ordinary skill in the art should be appreciated that, all are not exceed scope of the present invention for the modification of carrying out in appended claim scope.

Claims

1. the IP phone of a wideband IP network comprises:

Microphone (111) is used to gather voice signal;

Earphone (112) is used to play voice signal; With

Panel (113) is used to provide dialing; It is characterized in that this IP phone also comprises:

Sampling module (114a) is connected with described microphone (111), is used for the voice signal that described microphone (111) collects is converted to digital signal;

Compressing and decompressing audio file module (116), (114a) is connected with described sampling module, is used for the digital signal that is sent to this module is carried out the full-duplex audio compression, decompressed;

D/A switch module (114b) is connected with described earphone (112), compressing and decompressing audio file module (116), is used for and will be converted to analog voice signal from the digital signal after the decompression of described compressing and decompressing audio file module (116);

Simulation ring dialing tone module (115) is connected with described earphone (112) and described panel (113), is used to produce simulated audio signals such as ring back tone, dialing tone, busy tone;

Protocol signaling control module (117) is connected with described panel (113), described D/A switch module (114b), described simulation ring dialing tone module (115), is used for and partner switched communication agreement, signaling, sets up communication process;

Network Interface Module (119) is used for being connected with IP network;

The IP parse module (118) of packing, with described compressing and decompressing audio file module (116), described protocol signaling control module (117) and described Network Interface Module (119) connect, be used for to become from the data encapsulation of described compressing and decompressing audio file module (116) the IP bag, add source address, behind the destination address, be fed to Network Interface Module (119), send to the other side, or will open from the IP bag of described Network Interface Module (119), and judged, if packets of audio data, then send to described compressing and decompressing audio file module (116), if signaling, agreement then sends to described protocol signaling control module (117).

2. the IP phone of wideband IP network as claimed in claim 1 is characterized in that the sample frequency of described mould/number conversion module (114a) is 32KHz.

3. the IP phone of wideband IP network as claimed in claim 1 is characterized in that the compression algorithm that described compressing and decompressing audio file module (116) adopts is ISO/IFC 11172-3.

4. the IP phone of wideband IP network as claimed in claim 1, it is characterized in that described phone panel (113) is made of section dialing in (113a), control section (113b) and liquid-crystal display section (113c), be used to provide dialing, retransmit, add spoon, dialing tone with ring, control functions such as volume, demonstration caller ID.