TW411685B - Method and equipment for detection and elimination of call-waiting signal for preventing network connection from interrupting - Google Patents

Abstract

This invention is concerning about the method and equipment for detection and elimination of call-waiting signal for preventing network connection from interrupting. The main function is that, while connecting to Internet via telephone subscriber line and LAN, if call-waiting signal is arriving, could alert the user that has a call-waiting in time, and could prevent the connection from interrupting by disturbance of the phone call-waiting signal sent by subscriber line. And this invention is also including a switch equipment that could change the telephone line connection from data communication status to voice communication status and could switch back to data communication status after ending the voice communication status.

Description

Printed by the Central Bureau of Standards of the People's Republic of China ^^ 16§5 Λ7 -------___ Ε ______ · V. Description of the Invention (/) The present invention relates to a method for detecting and eliminating dialing prompts to prevent network connection. Method and device for interruption, especially a method capable of effectively detecting telephone dialing prompt tone and eliminating telephone dialing prompt tone, so as to avoid connection due to interference of telephone dialing prompt tone when using a telephone line to connect to the Internet Break. With the prevalence of computer Internet, the activities of transmitting and obtaining information on the Internet using ordinary telephone lines have become more frequent. On the other hand, with the frequent use of telephones, telephone dial-up services provided by telephone companies have become increasingly popular. The so-called "telephone dialing function" basically requires the office switch to generate a periodic prompt tone when the phone is busy, and it is used to remind the user that there is a phone dialing and decide whether to temporarily suspend the call. Answer calls from callers. However, if the prompt tone of the telephone dialing occurs when the computer is connected, it will not only be unable to achieve the effect of the dialing prompt because the user cannot hear the prompt tone, but it will interfere with the computer connection and cause the connection to be interrupted. So far, there is no effective method to solve this problem, so only the passive interference can be avoided for the signal interference phenomenon. For example: Microsoft Corporation has built a function in the modem driver of its Windows software, so that users can choose to close the telephone plug-in function provided by the office switching system before the Internet connection, and wait for the connection to end After that, the software sends a multi-frequency command to restore the phone call function. Although this method can temporarily stop the telephone plug-in function of the local exchange during the computer connection to solve the problem that the prompt tone interferes with the computer connection and causes the connection to be interrupted, it also causes the general computer connection to be busy for a long time and the phone is completely unavailable. Problems with dial-in. On the other hand, the hardware company started from reducing the interference factors and tried to increase the paper size to apply the Chinese National Standard (CNS) Λ4 specification (210X297 mm) (Please read the precautions on the back before filling in this Fc ----— Pretend

11T ^ 1ίβ85 Λ7 B7 isi: sf 'Printed by the Ministry of Central Standards Bureau of the Ministry of Standards and Technology of the People's Republic of China. 5. Description of the invention) The anti-interference ability of the link M' to extend the survival rate of the link. A typical example is the manufacture of modem DSP technology for modem chips to generate inverted signals to cancel the call forwarding number. However, this situation cannot accurately separate the disturbing signal and the data signal of the computer connection itself. It cannot completely suppress the sibling effect caused by the phone call reminder call, but can only prolong the survival of the network connection when it is disturbed. time. However, if the caller continues to dial the phone without hanging up, the network connection will still be interrupted due to the accumulation of interference effects. The user has a problem with phone dialing. If you want to remind the user that there is a phone call during data connection, you must continuously detect the phone call prompt tone during the data connection. Because the telephone dialing k is mixed with the data communication signal, and the frequency of the telephone dialing prompt is also within the frequency range covered by the data communication g, the difficulty of judgment is increased. So far, several pre-patent cases have proposed solutions to the detection of telephone dialing prompts. For example, US Patent No. 4, 852, 151 "WITH CALL WAITING" is to determine whether to enter the detection process of the telephone dial tone by detecting the presence or absence of the carrier. However, the disappearance of the carrier signal may be caused by the transmission problem of the telephone line itself. At this time, if the data transmission mode is cut off, it will inevitably affect the normal data connection and cause the delay. In addition, U.S. Patent No. 5,287,401 "APPARARUS AND METHOD FOR A MODEM FOR DETECTING A CALL WAITING SIGNAL" proposes a more complicated method for judging this shortcoming. It applies the Chinese National Standard (CNS) Λ4 Regulations for this paper standard. 210X29 · / public waste) (Please read the precautions before filling in this poverty)-Binding 41168s printed by the Central Procurement Bureau of the Ministry of Economic Affairs, Consumer Cooperatives V. Description of the invention (Xi) A two-stage detection method 'And take into account the duration of the phone dial tone and the interval between the two phone dial tone. However, its disadvantage is that when there is a telephone dialing prompt tone generated and the two-stage telephone dialing tone detection procedure is entered, 'the signal frequency of the data communication itself happens to fall within the detection range of the telephone dialing tone, then It will disrupt the periodic judgment of the normal telephone dial tone, which will cause misjudgment of the non-phone dial tone and affect the accuracy of detection. Although as long as the caller does not hang up, the subsequent call dial tone can still be detected ', but because the detection time has been delayed, the data connection will be disconnected due to the interference of the phone dial tone. Other patent creation cases are designed for specific application environments. For example, US Patent No. 5,550,908 "MODEM COMMUNICATIONS INTEROPERABILITY WITH SERVICES EQUIPPED TO PROVIDE CALLING PARTY IDENTITY DELIVERY WITH CALL WAITING" will detect the call dial tone Notify the remote modem to extend the carrier interruption timing, and start receiving the caller identification code (Cal Identity), and then further display the caller identification code on the computer screen to the user. The limitation of this patent case is that the modems used at both ends of the data communication must have the same special communication protocol to achieve the purpose of extending the carrier interrupt timing without interrupting the data communication connection. At the same time, the office switch must also provide the caller. The identification code is used to identify the receiver. This—limitation undoubtedly limits the data connection object and applicable environment. When a fixed network operator (such as Chunghwa Telecom) does not provide the service of the beer caller identification code, the patent case will not be able to perform its functions. There is a prevalence of using the office telephone line to connect to the Internet and telephone plug _______ This paper size is applicable to China National Standards (CNS) ----- ~ --_ (I first heard the back-and-forth notes and then write this page}

Printed by the Central Bureau of Standards, Ministry of Economic Affairs and Consumer Cooperatives 4llS8s A7 —-----—-_____ B7 · V. Description of the invention (〆) Necessity and convenience in dialing emergency calls' It is necessary to dial the phone The proper work should be done so that those who access the Internet with a modem can continue to connect to the Internet without being disturbed by the dialing tone of the phone, and enjoy the success of the phone dialing. The user has the right to decide whether to continue the computer connection without answering the call or interrupt the connection to answer the call when dialing the phone. Therefore, the present invention proposes a method for eliminating telephone dialing prompt tone and a device for realizing the method, so as to avoid the trouble that the conventional environment will cause the interruption of the network connection and the failure to obtain the dialing service, which will make the network The connection is in parallel with the telephone dialing service π, so that users can be promptly notified when the telephone dialing occurs and make a choice whether to continue the Internet connection or answer the call. From the above, it can be known that the main purpose of the present invention is to provide a method and a device that can detect and eliminate the dialing prompt tone to prevent the network connection from being interrupted. The signal interference caused by this, and the prompt audio signal is converted into another signal, so that users who use the modem to connect to the Internet can know the occurrence of telephone dialing and necessary treatment. A secondary object of the present invention is to provide a telephone dialing prompt detection method for effectively detecting a telephone dialing prompt mixed in a data communication signal. In order to make your reviewers better understand the technical characteristics of this creation and achieve the purpose of efficacy, I would like to attach detailed illustrations as follows: (1) Schematic part: The first diagram: the time relationship diagram of the Fiash implementation of this invention twice . FIG. 2 is a circuit block diagram of a specific embodiment of the present invention. ________ 6 Standards for Rewarders (CNS) in this paper standard system Λ4 specification (21QX 297 male H ~~ —- (Please read the precautions on the back before filling this page)

^ 1685 A7 B7 V. Description of the invention (i " Second picture: is the circuit diagram of the telephone plug-in alert detection circuit of the present invention, fourth to sixth diagrams. It is a flowchart of the system control for implementing the present invention specifically. (2) 圊Part: (1 0) Power circuit (201) Pre-amplifier (2 0 3) Band-pass filter (2 0 5) Audio decoder (2 0) SAS detection circuit (2 0 2) Pre-amplifier (2 〇4) Post-amplifier (30 V external line state detection circuit Central Standards Bureau of the Ministry of Economic Affairs κκ; Industrial Consumers Cooperative Society ^^ 40) Telephone hook detection circuit (50 〇 \ Ring generation circuit (4 0 1) Telephone Port a hook detection circuit (402) Phone B hook detection circuit (60) Busy tone generating circuit (70) Microprocessor (80) Relay circuit (801) (802) relay The main purpose of the present invention is Effectively eliminate the signal interference caused by the audio signal of the telephone plug-in prompt to the network cable, and convert the audio signal of the prompt into another signal, so that users who use the modem to connect to the Internet can know the phone call It is necessary to deal with the occurrence of the phone call. The conventional telephone dialing service is provided by the office exchange system. Add a periodic audio signal to the connection of the call to remind one of the parties that the phone is plugged in. At this time, the person who is dialed can simply press the phone hook or press the Flash key to change the original call. One party is temporarily isolated and talks with the caller. If you want to resume the call with one of the original callers, you can do the Flash operation again. At this time, the caller is isolated and the line is returned to the original caller. Ί 纸 伕The scale is applicable to the national standard (CNS) Λ4 specification (210X297). (Please read the note y on the back before filling in this page). Pei Ding-° t-I ί --Ϊ · ^ 11685 Μ —- ----ΒΊ-V. Description of the invention (έ) {Please read the precautions on the back before filling out this page) And it is known that telephone plug-in will interfere with the network connection and cause the network interruption, because of local exchange The periodic audio prompt signal sent by the system when providing telephone dialing service will be regarded as noise by the modems at both ends of the computer connection. Because the modem itself has automatic adjustment when the received signal power changes greatly. Signal correction of signal transmission power and if necessary The other party is required to resend the data. Therefore, when the prompt signal of the phone dialing appears, the data machine will start the aforementioned repair function to ensure the correctness of the data transmission. If there is no longer any additional noise source to generate noise, communication The data opportunity of both parties will return the signal to the original level, but if the prompt signal of telephone dialing appears again at this time, the data opportunity repeats the aforementioned repair action. As the conventional telephone dialing prompt signal period is between 2 and 4 seconds After the completion of the repairing action generated by a telephone prompt signal, the modem cannot restore the signal level to the original level within this short time interval. At this time, it will face a phone call prompt signal again, and will continue to repair it. Therefore, after the phone call prompt signal repeatedly appears two or three times in a row, the data unit should interrupt the connection because it has been unable to complete the repair action. KO: Central Standards Bureau of the Ministry of Economic Affairs KO: Industrial Consumer Cooperatives Co., Ltd. Yinli Therefore, the present invention mainly proposes an effective prevention method for this problem, to prevent the network connection from being interrupted by the interference of the telephone plug-in prompt signal . The main technical method is to eliminate the phone call prompt signal to completely avoid the interference caused by the phone call prompt signal. The specific processing method is as follows: Step 1: Detect the audio prompt signal of the phone call. Step 2: When Zhenzhen detects the phone call prompt signal, it immediately generates a secondary flash action to 'cut off the original connection status and quickly re-enable it. __ 8 This paper size is compatible with the family standard (CNS) / \ 4 听 （~ Printed by the Central Standards Bureau Ordnance Industry Consumer Cooperatives of the Ministry of Economic Affairs ^ 11685 A7 ______ B7 ^ V. Description of the Invention (7) Switch back. When the Flash action was generated for the first time in step 2 above, the original Internet connection It will be temporarily isolated 'and the dialled party will be connected to the dialer. However, the second time Flash will isolate the dialer and connect the two ends of the original network connection again. Here In the state, as long as the caller does not hang up, the caller will still be in the call-on-call state. On the other hand, the two sides of the network connection will have an empty window period for the connection termination during the line switching between the two F1 ash. Data transmission may be missed. However, because the modem itself has the function of requesting data retransmission, as long as the connection isolation time is short enough, this switching action will not cause the connection to be interrupted. '' Because of the second Flash function Switch the line back To the two parties that were originally connected, the caller is temporarily isolated and placed in a call-inserting state, so the caller can still be connected to the line to achieve the purpose of the call as long as appropriate processing is performed. Therefore, the present invention is the first The purpose is to remind those who use the Internet on the modem to have a phone call, and provide them with the choice of whether to terminate the network connection and answer the call. The foregoing purpose can be achieved by the following methods: (1) For office use The switching system does recognize the two individual Flash actions to switch back and forth between phone calls; (2) During the time when the modem is isolated from the telephone connection, it remains in the connection mode without being disconnected. General local exchange The system recognizes F1 ash within a certain range, as shown in the first figure, when the Flash generation action lasts for a specific period of time ___ 9 This paper standard (CNS) Λ view (2) 0 > < 297 read —) — (Please read the notes on the back before Qi writes this page)-Binding A7 137 4 β85 Invention Note (j) will be judged as a F1 ash. If two a, j bang the flash time interval of two people If less than A specific time is 7; if it is less than one, it will be considered that only one Γι_ is generated, that is, the time interval between two flash executions must be greater than p. On the other hand, if the other party ’s signal is not received during the modem connection, Temporarily in the connection mode and try to resume normal communication with the other party through the established communication protocol. When the time of receiving no signal from the other party exceeds a certain length%, the & machine will consider the connection to be offline and go offline. The present invention provides the effect that the two methods of the aforementioned method? Lash will temporarily isolate the line, so the time for two flashes: If the interval is less than a certain value, the connection can be continued without interruption. Assume that the length of a flash is rf, as shown in the first figure, the length of the connection isolation time caused by the two flashes when a phone call is generated is

Tm-ίρ -f Χ {Under the foregoing conditions, as long as 6 can satisfy the following conditions, the purpose of the present invention can be ensured: ^ < ίρ < 7 «-Τί Among 7; and 7; It varies with each other, and the other aspects will vary with different modem versions. Therefore, in the specific implementation of the present invention, the best coverage in different systems can be sought. ^ That is, the previous = conditional expression about 6 can be changed to the following generalized conditional expression:

Max (7S) < u < Min (7〇- Max (Tf) In the foregoing conditional expressions, Max (7;) and Max (7;) respectively represent that measured by different office switching systems are the same as A The maximum value, and Min (r0, please read the note on the back & then the page on the page of the Central Standards Bureau of the Ministry of Economic Affairs, Employees' Cooperatives and Cooperatives, printed on 51 sheets of paper, applicable to China ’s national standard rate (〇 阳). 297 public garbage) The Central Bureau of Standards of the Ministry of Economic Affairs only prints consumer cooperatives ^ 411685 A7 ____ 137 'V. Description of the invention (/) is the minimum value measured by different modem versions. The closer the choice of the actual application is to the Max (7;) The better, this is because the exchange system for different domestic offices is at 7; the difference is easier to obtain, but there are many versions of modems in the field, and it is difficult to test all the modem versions-another; On the one hand, the shorter the time that the modem is isolated and connected, the less negative factors it may cause to the modem. In the following specific embodiments of the telephone plug-in processing device covered by the present invention, Z = 500 is selected. ms, 2500 ms = In order to implement the foregoing method in order to achieve Road users can be appropriately reminded that a phone call occurs, and the purpose of not interrupting the network connection before determining to answer the phone call is provided. The present invention provides a phone call processing device to enable Internet access through a telephone line. The functions of the connection service and the telephone plug-in service can be parallelized. The foregoing device is used to detect the telephone plug-in tone (hereinafter referred to as SAS) mixed in the data communication signal. Because the frequency of the SAS falls in the frequency band of the data communication signal Within the range 'and the strength of the data communication signal may exceed the strength of SAS, so the detection of SAS must overcome the problems of recognition rate and false positive rate. That is, when SAS occurs, data can be correctly detected and when SAS does not occur, data occurs. The frequency of the communication signal is approximately the same as that of the AS frequency, and it will not be misjudged as $. The following will propose a method that is different from the multiple pre-patent cases in the background of the invention, but can effectively ensure a very high recognition rate and a very low misjudgment rate. According to the communication specifications of general countries, the size of the signal transmitted on the telephone line is specified. For example, the FCC in the United States requires that all signals be sent to the telephone line. The signal of the road cannot be greater than -9 dBm 'and the size of the signal sent to the client is approximately 11 degrees. Applicable to China National Standard (CNS) grid (210 × 297 ^^ " ρ · —————— (Please read the back first) Note for re-filling this page) * π Printed by the Central Bureau of Standards of the Ministry of Standards and Technology of the People's Republic of China, 411685 A7 __B7 'V. Description of the invention (, 〇) ~ 12 dBm, so the client sends the The data communication signal will be about 3 dB higher than the SAS delivered by the local exchange. This will undoubtedly make the user input to the SAS signal-to-noise ratio quite unsatisfactory. On the other hand, although the frequency of the SAS falls within the frequency band of the data communication signal, after carefully observing the characteristics of the data transmission signal, it can be found that the signal frequency of the data communication will only approximate the SAS signal in a few cases. Frequency situation. If the duration of the signal is further considered, it is found that the letter of data communication will only appear similar to the characteristics of the SAS number when the modem is in the conversation mode of consultation through consultation. Therefore, how to avoid the data —. *. Machine processing mode, and then detect the specific frequency and signal duration, you can achieve the goal of improving the SAS recognition rate and reducing the false positive rate. First of all, regarding the problem that the strength of the aforementioned data communication signal will exceed the strength of SAS and cause the SAS signal to noise ratio to be unsatisfactory, non-SAS signals can be attenuated and filtered to different degrees through the detection circuit proposed below to strengthen the approximation Detection capability for SAS frequency signals. Because the characteristics of the SAS signal include the signal duration in addition to the frequency, so to effectively separate the SAS signal from the non-SAS signal, the signal duration can be taken into consideration. Therefore, the present invention proposes a SAS discrimination time window in order to After detecting a signal with an approximate SAS frequency, it is further observed whether the duration of the signal falls within the range of the SAS discrimination time window. If it is, it is judged as a SAS signal; otherwise, it is judged as a non-SAS signal. Secondly, as described above, when the modem is in the negotiation mode of the communication protocol consultation, it may send a signal that approximates the characteristics of the SAS signal and cause misjudgment. In order to avoid this misjudgment, you can apply the Chinese National Standards (CNS) Λ4 standard (210X297 mm) when the modem is in the communication protocol. 12 Please read the precautions before completing this page ) I — Equipment · 411685 Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs-V. Description of the Invention (//) The detection of the SAS signal is stopped during the conversation mode. Since the purpose of the present invention is to provide a simple device independent of the modem to detect the SAS signal and automatically switch the connection when the user decides to answer the call, it does not intervene in the communication protocol of the modem to learn about it. What mode of operation it is in. After careful observation and analysis, it can be found that, except for a few cases of poor communication quality, once the connection is successful, the modem will not enter the conversation mode of communication protocol consultation. Therefore, it was invented that the SAS detection function was temporarily canceled for a period of time after the modem started dialing to make a connection attempt, and the SAS detection was lost. This period was lost to avoid possible misjudgments. 62% 的 cognition rate and based on the experimental results of about 5000 experiments, the SAS discriminative time window can be set between 300 ms and 700 ms during the implementation of this creation. The false positive rate is 0.21%. Although this result can not complete the situation of false positives and detect every phone call, it has achieved a practical goal. Please also refer to the second figure, which is a block diagram of a hardware system for realizing the foregoing method according to the present invention, which includes: a telephone port A connected to a local line telephone, and a telephone connection connected to a modem. Port B, a power supply circuit (i 0) that supplies DC power to the modem, a SAS detection circuit (20) '— an outside line status detection circuit (3Q), a telephone hook detection circuit (40), a ringer generation Circuit (50), a busy line tone generating circuit (60) '— a microprocessor (70) and a relay circuit (80)' wherein: the telephone port A and the telephone port B are respectively connected to the relay circuit ———_ ___________________ 13 This paper size applies to Chinese National Standards (CNS) ----- (Please read the notes on the back before filling out this page)--I---1I Μ · Packing _ 1T 4U685 A7 137 5 2. Description of the invention (/ >) (80) The two sets of relays (80) (80) are connected to the relay circuit (80), which is connected to the microprocessor (70) so as to pass through the relay circuit (8 G) Switching from the local line telephone or modem to the outside line. The power circuit ( 10) is used to provide the power supply for the entire group of devices, and through the relay (80), the relay can provide enough DC current to the modem. Its purpose is to ensure that when the present invention, during the data connection, 'the editing machine is temporarily cut off from the outside line #, so that the data machine will not be disconnected due to the lack of DC t stream supply', # to re-establish data communication after the end of the voice call Opportunity to connect. The composition structure of the SAS detection circuit (20) is as shown in the third figure. It includes:-, a secondary amplifier (20 workers) (200), a τ waver (203),- A post amplifier (204) and an audio decoder (205). Its main function is: In the data communication state, if there is a telephone dial tone (SAS), this signal can be detected promptly and correctly. The first and second level amplifiers (2 0 丄) (2 0 2) are used to provide different frequency signals with different gains. The purpose is to suppress higher frequency signals and highlight the proportion of SAS signals. This effect is to improve Sensitivity of audio decoder (2 Q 5) to SAS signal. The band pass wave filter (203) is used to filter the signals outside the frequency range of the audio demodulator (205). The _, two-stage amplifier (201) (202) and the band-pass wave filter (203) are connected in series, so that the audio decoder (205) can obtain a fairly sensitive detection capability. · In fact, because the gain value of the primary amplifier (201) is _____14 t, the paper size is applicable to the Chinese storehouse standard (CNS) specification (210X 297) ^ .J ....... ··· r · ^ '- ----- --I ---------- install ---- ^ --- order ------, 1 (Please read the precautions on the back before filling this page) Ministry of Economic Affairs Printed by the Central Bureau of Standards Monthly Consumer Cooperative 411685 -Κ. --¾ Printed by the Central Bureau of Standards of the Ministry of Economy Shellfish Consumer Cooperative A7 B7 V. Description of Invention (Λί) Wood 1 (/) = / Γί = 不 / 于 ' Where / ι = and // (1/2; τ / X), and the gain value of the secondary amplifier (2 Ο 2) is about ^ V2 (f) ^ V〇2 / ί〇ι = // (1 / Ιπί Χ (Γ2) / Therefore 'If you choose to advise G = 6.8 × 10-4 QF, Q. Q = 1〇-3 Ω F' C3 = C4 = 0 · 01 pF, 妁 = 2 and 7 'will be obtained Signals above 1 KHz and at least 30dB suppression to significantly improve the signal-to-noise ratio at the input SAS of the audio decoder (2 0 5) in the presence of data communication signals. Furthermore, the post-amplifier (2 0 4) is responsible for adjusting the signal size to the valid range of the input signal of the audio decoder (205), so that Effective detection of the number #. And through the aforementioned circuit and the gas detection disabling period of 90 seconds and the SAS discrimination time window of 300ms to 700ms, it will greatly improve the recognition rate of SAS signals and greatly reduce the misjudgment rate of non-SAS signals. The outside line status detection circuit (30) is used to detect whether an outside line is occupied. The purpose is to notify the microprocessor (0) when an outside line is used. At this time, any attempt to connect to the telephone line through this device is It must be stopped. The method is to control the relay (801) or (802) in the relay circuit (80) through the microprocessor (70) to isolate the telephone terminal equipment connected to the back end from the outside line. The telephone hook The price measurement circuit (40) includes-a hook circuit (4 Q) connected to the telephone terminal A and a fishing predicate circuit (4 0 2) connected to the electrical terminal β to detect the connection to Phone connection itchya Phone connection terminal B is connected to the phone terminal device 〇N / 〇FF state. When --j --------- 〈锖 Read the precautions on the back before filling in this 裒) '' π This paper size applies to Chinese National Standard (CNS) 15

Adi ^ (\ ® w 41168 ^ A7 ___ B7 · V. Description of the invention (W) When its status changes, the microprocessor (70) will detect the signal and follow the corresponding action according to the current situation. The vibration钤 The generating circuit (50) mainly generates a ringing signal similar to a sine wave from the pulse signal sent from the microprocessor (70). It rings the telephone terminal equipment connected to the telephone port A. s Xuan busy line tone generating circuit (6 0) It accepts two sets of pulse signals with different frequencies {4 and fB sent by the microprocessor (7) to tune it into a multi-frequency busy line tone, and sends it to the telephone port A. The microprocessor (70 ) Is the processing core of the device, and is responsible for executing the workflow shown in Figures 4 to 6 to control the normal operation of the aforementioned circuits' to specifically implement the method mentioned in this creation and the purpose of cost creation. When the data machine When data communication is in progress, the microprocessor (70) continuously monitors the outside line and calculates the duration of the signal after the SAS detection circuit (20) detects a signal that meets the SAS frequency. If the counting result falls within a predetermined

Within the SAS discrimination time window, the 'microprocessor (70) will ring the A-terminal of the telephone connection bee' and perform a secondary flash action on the outside line in accordance with the foregoing steps. When the telephone connected to the telephone port A answers, the microprocessor (70) performs a flash action on the outside line, and connects the telephone plug-in terminal to the user terminal so that the network connection user can dial in with the telephone caller. call. After the call is over, the microprocessor (70) will perform an F1 ash action on the outside line, so that the phone connection can be returned to the original data communication connection. 'If the near-end and far-end modems have not been interrupted because of communication, After a long disconnection, the original data communication can be restored. During normal operation, the microprocessor (70) passes the relay (801--16. This paper size applies to the Chinese National Standard (CNS) ΛΑ specifications (210X297 mm).

»In-—I— II .1: 9 I---.-1! 1 I (Please read the notes on the back before filling this page} Order the Central Standards Bureau of the Ministry of Economy Printed by the Central Bureau of Standards, Consumer Cooperatives Co., Ltd. 12. 411685 V. Description of the Invention (/,) 1) Connect the electric cleaning connection A to the external line, and the relay (802) to connect the telephone port B to the telephone hook B detection circuit (402). In the control flow of Figures 4 to 6, according to the polling sequence of (step 901) and (step 902), the telephone terminal device connected to the telephone port a is more than the telephone terminal connected to the telephone port B. The device has high outside line usage rights. When the telephone terminal device A wants to use an outside line, it can be used immediately because it is directly connected to the outside line. At this time, the microprocessor (7 Q) detects that the outside line is occupied by the outside line status detection circuit (30). Step 9 0 1) 'During the period when the outside line is occupied, the microprocessor (70) will ignore any disconnection operation of the telephone terminal device B. When the outside line is not in use, if the microprocessor (70) hangs up the B debt test circuit (402) via the telephone and detects that the telephone terminal device B has disconnected (such as step g 〇2), the relay will be relayed. (8 0 2) cut to the outside line, and cut off the telephone port A from the outside line via the relay (80 1) (step 9 03). At this time, the system enters the SAS detection failure period, and the microprocessor (70) starts to start and when the device counts the end time of the SAS detection failure period (such as step 905). If the modem is disconnected during this period (such as step 904), then connect the telephone connection 槔 A to the outside line (such as step 9 Q 6). While the telephone terminal equipment B is using the outside line, if the microprocessor (70) detects the movement of the telephone terminal equipment A via the telephone hook A detection circuit (4 0 1) (such as step 9), it controls The busy line tone generating circuit (60) issues a busy line tone (such as step 9 009) to inform the outside line that it is currently in use; if the signal that meets the s A s frequency is detected by the s AS detection circuit and the holding time falls within Within the time window of SAS judgment, it is judged that the test reaches 17 (please read the notes on the back and fill in ίττ Irc-pack. Ding-5. This paper hates the standard General Ning Hao National Tomb Standards (CNS) 8 4 cells (21 〇 > < 297 Gong A7 B7 V. Description of the Invention (A) — The prompt signal for telephone plug-in (such as step 907), then the external line will be flashed twice (such as step 912), and the line will be switched first. Go to the caller 'and switch back to the original call line. At the same time, set the ringing injury A on the telephone terminal according to the preset number of ringing times (such as step 9 x 3, 9 5). If the telephone terminal device A is disconnected during the ringing ( As in step 9 1 4), ash the outside line f 1 once (as in step 9 1 6), and the telephone is relayed via the relay (802) The terminal device B is cut off from the outside line, and the telephone terminal device A is cut off to the outside line through the relay 1) (such as steps 9 丄 7) v Then the caller can be talked to through the telephone terminal device A. After the call is over (turn the phone terminal Device A hook) (such as step 9 18) External Flash (such as step 919), and connect the modem to the external line through relay (802) (such as step 9 2 0), so that the original data communication can be connected If the number of rings has not been answered after answering the ringing number (such as step 9 i 5), the system will return to the normal network connection state (such as step 9 〇). Repeat this operation until the modem disconnects (such as Step 9 10), and then terminate the telephone port A to the outside line (such as step 9 1 1). From the workflow of the fourth to sixth figure, you can know 'Just connect the modem to the rear end of the telephone port B of this device The purpose of the invention can be achieved. That is, when the Internet is accessed through a modem, it can be learned from the telephone connection of the telephone connected to the A terminal that a call is generated. In particular, the Internet user can choose Not answering the phone, so because of the call The dial tone has been eliminated by the method mentioned in the present invention, and it will not continue to interfere with the network connection, so there will be no known network disconnection. If the Internet user chooses to answer the call, Steps 916, 917) 18 paper sizes are applicable to Chinese National Standards (CNS) A4 specifications (210 X 297 mm.) Ί ----- ί Please read the note on the back before filling this page) * 1T printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 as 685 V. Invention Description (7) It can be used to cut the line to the caller to achieve the purpose of the call. It can be known from the above that the present invention provides a simple and practical method to solve the problem that the connection state of the Internet when it was easy to be interrupted due to the interference of the telephone plug-in prompt signal and the interruption of the connection state. The solution still does not allow Internet users to obtain the plague of dial-in messages. It can be seen that the present invention does have a high degree of utilization value in the industry. Compared with the existing solution and the significant effect improvement, it has both the industrial availability Utilization and advancement, and in line with the requirements of the invention patent, filed an application side by side. ---- 1 --- ί ----- install-- (Please read the notes on the back before filling in this page)

, 1T Printed by the Wisdom Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

Claims (1)

Printed by Yin Yangxun Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative, 411685 A8 B8 C8 ---_________ DS, VI. Patent Application — ~ —- 1 method to detect and eliminate the prompt tone of telephone dialing to prevent the interruption of network connection, mainly After detecting the periodic phone call prompt tone, the flash will be generated twice for the outside line. The line will be switched to the caller first, and then switched back to the original k line to stop the call prompt tone and avoid the network. The connection was interrupted due to interference. 2 > Patent 4 & Circumstances described in item 彳, a method for detecting and eliminating phone dialing tones to prevent network connection interruption, and methods for detecting phone dialing prompts include: The connection is initially generated—a specific period of detection of the incapacitation period. The telephone dial tone detection function is temporarily turned off to reduce the SAS misjudgment rate; '(2) Data communication connection after the SAS detection incapacitation period has passed. During this period, the special frequency is monitored, and after detecting a signal that meets the frequency characteristics, then observe whether the duration of the signal that meets the specific frequency characteristics falls within a specific SAS discrimination time window as a judgment SAS signal. The basis of being born: If yes, it is judged that a SAS signal occurs; otherwise, it is a non-SAS signal. _ 3 The method described in item 2 below to measure and eliminate the telephone dialing prompt to prevent the network connection from being interrupted. The SAS detection failure period of the telephone dialing prompt detection method is set to leap seconds. The discrimination time window is set to 300 ms to 700 ms. 4 'As described in item 1 of the Chinese Materials Department, a method to eliminate phone calls and silence to prevent network connection interruption, its external line number L ._____ ___20 Paper size ii 阙 Fresh (eNS) A4j ^ (21 ( ) > &297;-)-(Please read the note on the back ^ Φ before filling in this page) i 1 Pack * Order. It II, 411685 ABCD 6. The interval of the patent application scope msh must be between Μ η to ensure that the local embroidery parent exchange system can actually perform the switching action of the calling end and (please read the precautions on the back before filling this page) Cause line isolation It is too long and interrupted; here is the line exchange system: the shortest time interval between two consecutive flashes is to isolate the modem connection and maintain the modem for the longest time. Flash action duration. 5 · As described in item 4 of the scope of the patent application, and the method and method of eliminating telephone dialing prompts to prevent the network connection from being interrupted. The interval between the two and two under-concentrations in the booth is set to 2500 ms, Fiash The duration is set to 500ms. One,-6 · —a type of telephone plug-in processing device, which includes: a telephone connection 璋 A connected to a local line telephone; a telephone port B connected to a modem; A microprocessor 'is used to detect various feedback signals and control the normal operation of each circuit; a power circuit is used to provide system power and is connected to the telephone port B at the same time to provide a modem during the temporary interruption of the data communication connection DC power supply; Printed by the Consumer Cooperatives of the Central Echelon Bureau of the Ministry of Economic Affairs-SAS detection circuit, which is connected to the outside line and is responsible for detecting a certain frequency signal on the telephone line; An outside line status detection circuit, which is connected to the outside line to determine its Whether it is in use;-Vibration generating circuit, which is respectively connected to the microprocessor and the telephone port A, so as to accept the pulse signal sent by the microprocessor and to the telephone port 21 This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) 411685 Bismuth C8 ______ — _ D8 VI. Application 1 — ~ 'A's line telephone vibrates; a telephone hook detection circuit for detecting Measured the connection between the telephone terminal devices a and B of the telephone port port. A busy line tone generating circuit is connected to the telephone port A so as to generate a busy signal to the office line telephone when receiving the pulse signal from the microprocessor. Line tones; a relay circuit for different connection switching between a telephone connection port A and a telephone connection port B and outside lines for different situations. 7. As described in item 6 of the scope of the patent application, the outside line status detection circuit provides outside line use detection capabilities to limit the use of outside line functions by other telephone terminal equipment when outside lines are used. 8 'The telephone plug-in processing device as described in item 6 of the scope of the patent application' The SAS detection circuit detects signals outside the frequency within a specific range, and the circuit includes a one-stage, two-stage amplifier, a band-pass filter,- Post-amplifier and an audio decoder; and the SAS detection circuit will reduce the number 4 outside the specific frequency range 'especially suppress the signal above 1 KHz at least 30 dB above' to improve the specific frequency range Signal to noise ratio. .--- ~ Installation-- (Please read the precautions on the reverse side before filling out this page), 11 The staff of the Central Government Standards Bureau of the Ministry of Economic Affairs, the Consumer Cooperatives Cooperative Association 22 This paper size applies to China National Standards (CNS) A4 specifications ( 210X 297 males)