CN102457631A - Method and device for eliminating in-band dual-tone multi-frequency of 3G (third generation) wireless router - Google Patents
Method and device for eliminating in-band dual-tone multi-frequency of 3G (third generation) wireless router Download PDFInfo
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- CN102457631A CN102457631A CN201010514844XA CN201010514844A CN102457631A CN 102457631 A CN102457631 A CN 102457631A CN 201010514844X A CN201010514844X A CN 201010514844XA CN 201010514844 A CN201010514844 A CN 201010514844A CN 102457631 A CN102457631 A CN 102457631A
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Abstract
The invention discloses a method and a device for eliminating an in-band dual-tone multi-frequency of a 3G (third generation) wireless router. After the conversation is established between the 3G wireless router and an external telephone, the in-band dual-tone multi-frequency generated in the process of pressing keys is mixed in a voice signal and reaches a Modem chip through an audio interface. The invention discloses the method for eliminating the in-band TDMF (dual-tone multi-frequency) in application of the external telephone. By eliminating the in-band TDMF and using an out-of-band air interface DTMF signaling, the accuracy and the effectiveness of opposite terminal DTMF detection, particularly secondary dialing detection, are effectively ensured.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the implementation method and the device of the external phone band of a kind of 3G of elimination wireless router DTMF tone.
Background technology
Along with the professional continuous development of 3G; Especially the high-speed mobile data communication is more and more abundanter for the business that the user provides; The service of moving is used more and more general; The application of 3G wireless router also more and more widely, a kind of 3G wireless router with external phone has been taken into account the dual needs of user speech and data sharing.
Dual-tone multifrequency can adopt dual mode between the calling and called gateway, to transmit: in-band method and out-band method.In-band method is the transmission means that touch-tone signal is encapsulated in voice packet, and out-band method is to use the transmission means of out-of-band signalling.In-band method receives the situation that approximate frequency in the voice packet disturbs the influence with echo cancellation to cause the opposite end to detect erroneous judgement or fail to judge easily, and it is accurate that out-band method then receives without interruption.Eliminate DTMF tone in the band, using out-band method is the thinking that we deal with problems.
In the application of the external phone of 3G wireless router, the outer dual-tone multifrequency mode of band is adopted in twice dialing in the communication process usually, promptly uses signaling to send key assignments; But because the restriction of external phone and SLIC chip itself; DTMF tone can't be avoided in the band, and therefore in this case, DTMF tone sends to network side simultaneously with the outer dtmf tone of band in the band; Because dual-tone multifrequency is subject to the interference of uncertain factor in the band; The opposite end certain probability can occur same touch-tone signal is detected twice situation, causes twice dialing misjudgment, has a strong impact on the user and normally uses telephone bank, customer service, dials the extension business of expecting someone's call.
Therefore, in order to guarantee the accuracy of twice dialing under this application, in band, under the unavoidable situation of DTMF tone,, realize that the way that DTMF tone is eliminated in the band is very significant not by additional hardware chip or third party software.
Summary of the invention
Deficiency to prior art; The object of the invention provides a kind of method and apparatus of not eliminating through DTMF tone in the 3G wireless router band; Through SLIC (Subscriber LineInterface Circuit SLIC) the external phone of chip is a kind of important application of 3G wireless router; But SLIC chip ubiquity detects, processing speed is slow; The detection of DTMF tone and processing can not be satisfied real-time requirement in the band that the dialogue machine button produces; And dual-tone multifrequency is subject to audio disturbances such as approximate frequency and echo cancellation to cause the opposite end to be detected inaccurate in the band, if button dual-tone multifrequency and the outer dual-tone multifrequency of band in the excitation band simultaneously can cause the opposite end to detect the repetition touch-tone signal again.High processing rate through utilizing 3G Modem chip sound intermediate frequency processing module is accomplished dual-tone multifrequency measuring ability in the band, through in time dual-tone multifrequency in the band being eliminated in the quiet operation of upstream tones path, can effectively address this problem.
The present invention realizes through following technical scheme:
The method and apparatus of DTMF tone elimination in the 3G wireless router band after the external phone of described 3G wireless router is set up conversation, produces the interior DTMF tone of band and is blended in the voice signal during button, arrive the Modem chip through COBBAIF.
Described Modem chip internal has the dual-tone multifrequency detection module, touch-tone signal in the band in the frequency through judging dual-tone multifrequency and the duration detection input speech signal.The Modem chip internal has the quiet function of control audio data feedback channel.
After described dual-tone multifrequency detection module detects and has touch-tone signal in the input signal; The control audio data feedback channel is quiet; Keep the mute state certain hour can't upload, confirm to open the upstream tones passage again behind the no double-tone multitone to guarantee DTMF tone.
Describedly in the voice band, eliminate external phone and produce dtmf tone, outside the voice band, the router main program uses the order of eating dishes without rice or wine to send the outer dtmf signaling of band.
Beneficial effect of the present invention is; Need not increase extra chip and third party's Audio Processing algorithm; Through the Modem chip of 3G wireless router cooperation band dual-tone multifrequency measuring ability and Audio Processing DSP, use software algorithm to accomplish the elimination of the interior dual-tone multifrequency of band, efficient is high, cost is low.
Description of drawings
Fig. 1 is a hardware principle block diagram of the present invention;
Fig. 2 is a realization flow sketch map of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment how the present invention is realized:
As shown in Figure 1, after the conversation foundation, DTMF tone in the band that external phone button produces is sneaked into the external audio interface transmission of passing through 3G Modem module in the conversation sound channel on the one hand, causes that on the one hand slic circuit produces dual-tone multifrequency and interrupts; Router host CPU program through the order of eating dishes without rice or wine, makes 3G Modem module produce dtmf signaling when the dual-tone multifrequency that receives SLIC is interrupted.
DTMF tone is through the DTMF detector of 3G Modem module in the band, and detector produces the purpose of interrupting and being reached DTMF tone in the filter bag by the quiet and open operation of voice-frequency channel control upstream tones path.
As shown in Figure 2, step 1: after conversation was set up, external phone button produced DTMF tone, and the SLIC chip produces dual-tone multifrequency and interrupts, and the router main program uses the order of eating dishes without rice or wine, and made 3G Modem protocol stack send the outer dual-tone multifrequency signaling of band.
Step 2: DTMF tone passes to the 3G module through the PCM passage of SLIC, and the dual-tone multifrequency detection module used special algorithm to judge and detects the interior touch-tone signal of band and produce and interrupt according to the frequency and the duration of the DTMF tone in the data feedback channel signal.
Step 3: quiet to the upstream tones passage in the dual-tone multifrequency Interrupt Process, confirm not have to open voice-grade channel behind the DTMF tone.
Claims (4)
1. the method and apparatus that DTMF tone is eliminated in the 3G wireless router band; It is characterized in that: after the external phone of described 3G wireless router is set up conversation; Produce the interior DTMF tone of band during button and be blended in the voice signal, arrive the Modem chip through COBBAIF.
2. the method and apparatus of eliminating according to DTMF tone in a kind of 3G wireless router band; It is characterized in that: described Modem chip internal has the dual-tone multifrequency detection module; Frequency and duration through judging dual-tone multifrequency are detected touch-tone signal in the band in the input speech signal, and the Modem chip internal has the quiet function of control audio data feedback channel.
3. the method and apparatus of eliminating according to DTMF tone in a kind of 3G wireless router band; It is characterized in that: after described dual-tone multifrequency detection module detects and has touch-tone signal in the input signal; The control audio data feedback channel is quiet; Keep the mute state certain hour can't upload, confirm to open the upstream tones passage again behind the no double-tone multitone to guarantee DTMF tone.
4. the method and apparatus of eliminating according to DTMF tone in a kind of 3G wireless router band is characterized in that: describedly in the voice band, eliminate external phone and produce dtmf tone, outside the voice band, the router main program uses the order of eating dishes without rice or wine to send the outer dtmf signaling of band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010514844XA CN102457631A (en) | 2010-10-21 | 2010-10-21 | Method and device for eliminating in-band dual-tone multi-frequency of 3G (third generation) wireless router |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010514844XA CN102457631A (en) | 2010-10-21 | 2010-10-21 | Method and device for eliminating in-band dual-tone multi-frequency of 3G (third generation) wireless router |
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| CN102457631A true CN102457631A (en) | 2012-05-16 |
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| CN201010514844XA Pending CN102457631A (en) | 2010-10-21 | 2010-10-21 | Method and device for eliminating in-band dual-tone multi-frequency of 3G (third generation) wireless router |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018040742A1 (en) * | 2016-08-30 | 2018-03-08 | 中兴通讯股份有限公司 | Dialing processing method and device, and telephone |
| CN108765925A (en) * | 2018-04-26 | 2018-11-06 | 深圳普创天信科技发展有限公司 | A kind of traffic accident alarm method, traffic accident alarm processing method and device |
| CN115550495A (en) * | 2022-09-02 | 2022-12-30 | 广州通则康威智能科技有限公司 | Method and device for filtering dual-tone multi-frequency signals |
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| CN1867011A (en) * | 2005-05-18 | 2006-11-22 | 华为技术有限公司 | Method and apparatus for transparently transmitting dual-tone multi-frequency signal under prepositioning echo canceller condition |
| CN101340681A (en) * | 2008-08-13 | 2009-01-07 | 中兴通讯股份有限公司 | Implementing method and apparatus for shielding DTMF sound of outer telephone |
| CN101695197A (en) * | 2009-10-23 | 2010-04-14 | 厦门敏讯信息技术股份有限公司 | Wireless access equipment, circuit thereof and method for realizing wireless two-stage dialing |
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| US6560331B1 (en) * | 1999-09-28 | 2003-05-06 | 3Com Corporation | System and method for precise DTMF signal detection |
| CN1409930A (en) * | 1999-10-14 | 2003-04-09 | 科恩格森特***股份有限公司 | Method and apparatus for early detection of DTMF signals in voice transmission over IP network |
| CN1867011A (en) * | 2005-05-18 | 2006-11-22 | 华为技术有限公司 | Method and apparatus for transparently transmitting dual-tone multi-frequency signal under prepositioning echo canceller condition |
| CN101340681A (en) * | 2008-08-13 | 2009-01-07 | 中兴通讯股份有限公司 | Implementing method and apparatus for shielding DTMF sound of outer telephone |
| CN101695197A (en) * | 2009-10-23 | 2010-04-14 | 厦门敏讯信息技术股份有限公司 | Wireless access equipment, circuit thereof and method for realizing wireless two-stage dialing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018040742A1 (en) * | 2016-08-30 | 2018-03-08 | 中兴通讯股份有限公司 | Dialing processing method and device, and telephone |
| CN107800851A (en) * | 2016-08-30 | 2018-03-13 | 中兴通讯股份有限公司 | A kind of dialing process method and device, telephone set |
| CN107800851B (en) * | 2016-08-30 | 2020-08-04 | 南京中兴软件有限责任公司 | Dialing processing method and device and telephone |
| CN108765925A (en) * | 2018-04-26 | 2018-11-06 | 深圳普创天信科技发展有限公司 | A kind of traffic accident alarm method, traffic accident alarm processing method and device |
| CN115550495A (en) * | 2022-09-02 | 2022-12-30 | 广州通则康威智能科技有限公司 | Method and device for filtering dual-tone multi-frequency signals |
| CN115550495B (en) * | 2022-09-02 | 2023-08-08 | 广州通则康威智能科技有限公司 | Filtering method and device for dual-tone multi-frequency signals |
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Application publication date: 20120516 |