CN101795341A - Method and device for detecting fax completion - Google Patents
Method and device for detecting fax completion Download PDFInfo
- Publication number
- CN101795341A CN101795341A CN 201010114825 CN201010114825A CN101795341A CN 101795341 A CN101795341 A CN 101795341A CN 201010114825 CN201010114825 CN 201010114825 CN 201010114825 A CN201010114825 A CN 201010114825A CN 101795341 A CN101795341 A CN 101795341A
- Authority
- CN
- China
- Prior art keywords
- modulation data
- code stream
- pulse code
- code modulation
- data code
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Facsimile Transmission Control (AREA)
Abstract
The invention discloses a method and a device for detecting fax completion, relating to the technical field of network communication, in order to solve the problem that gateway equipment is likely to have the phenomenon of misinformation of fax completion in the prior art. The embodiment of the invention provides a method for detecting the fax completion, comprising: acquiring pulse code modulation data code stream; demodulating the pulse code modulation data code stream; detecting disconnecting signals according to the demodulated pulse code modulation data code stream; and determining the fax completion if DCN signals are detected in the demodulated pulse code modulation data code stream. The embodiment of the invention enables the gateway equipment to judge out whether faxing is completed between a fax transmitting terminal and a fax receiving terminal accurately.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of method and device that detects fax completion.
Background technology
At present, the facsimile posting between the facsimile machine mainly is divided into three processes: fax beginning process, facsimile transmission process and fax completion process.Described facsimile posting relates generally to facsimile transmission end, fax receiving terminal and gateway device etc.Wherein, the method that described gateway device detects fax completion adopts the silence detection method usually, and this method is preset up fax code stream energy threshold, descending fax code stream energy threshold and the duration parameter when described up fax code stream energy and descending fax code stream energy all are lower than its predetermined threshold value state.Detect PCM (the Pulse Code Modulation of up fax when described gateway device, pulse code modulation) the code stream energy is lower than described up fax code stream energy threshold, and when the pcm stream energy of described descending fax also was lower than described descending fax code stream energy threshold, gateway device judged whether the time of described state continuance exceeds described default duration parameter; If exceed described default duration parameter, then described gateway device is thought and is in mute state between described facsimile transmission end and the described fax receiving terminal, promptly shows fax completion.
But, owing to the difference of described facsimile transmission end with the different of the residing applied environment of fax receiving terminal and himself characteristic, make described gateway device preset described up fax code stream energy threshold, descending fax code stream energy threshold and described duration parameter and be difficult to satisfy the needs of all kinds of facsimile machines, thereby make gateway device occur reporting by mistake fax completion easily.
Summary of the invention
The embodiment of the invention provides a kind of method and device that detects fax completion, to realize accurately detecting fax completion.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, the embodiment of the invention provides a kind of method that detects fax completion, comprising:
Obtain the pulse code modulation data code stream;
Described pulse code modulation data code stream is carried out demodulation;
According to the pulse code modulation data code stream after the demodulation, detect disconnecting signal;
If detect described disconnecting signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.
On the other hand, the embodiment of the invention provides a kind of device that detects fax completion, comprising:
The code stream acquiring unit is used to obtain the pulse code modulation data code stream;
Demodulating unit is used for described pulse code modulation data code stream is carried out demodulation;
Detecting unit is used for according to the pulse code modulation data code stream after the demodulation, detects disconnecting signal;
If detect described disconnecting signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.
A kind of method and device that detects fax completion that the embodiment of the invention provides is by obtaining the pulse code modulation data code stream; Described pulse code modulation data code stream is carried out demodulation; According to the pulse code modulation data code stream after the demodulation, detect disconnecting signal; If detect described disconnecting signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.Because gateway device has adopted and has detected described disconnecting signal and determine fax completion in the embodiment of the invention, so that gateway device can be judged the facsimile transmission end accurately and the fax completion between the receiving terminal of faxing.
Description of drawings
A kind of method flow diagram that detects fax completion that Fig. 1 provides for the embodiment of the invention;
A kind of method specific implementation flow chart that detects fax completion that Fig. 2 provides for the embodiment of the invention;
A kind of apparatus structure schematic diagram that detects fax completion that Fig. 3 provides for the embodiment of the invention;
The signal flow graph of a kind of descending facsimile data that Fig. 4 provides for the embodiment of the invention;
A kind of gateway device that Fig. 5 provides for the embodiment of the invention detects the particular flow sheet of disconnecting signal;
The frame structure schematic diagram of a kind of disconnecting signal DCN that Fig. 6 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing a kind of method and device that detects fax completion that the embodiment of the invention provides is described in detail.
Whether gateway device DCN (Disconnect, disconnecting signal) occurs and judges whether fax completion of described facsimile transmission end and described fax receiving terminal by detecting in the described pulse code modulation data code stream in embodiments of the present invention.Wherein, described DCN signal is one 8 bit binary number, and facsimile transmission end and fax receiving terminal all might send; If the DCN signal that the facsimile transmission end sends, i.e. 0x5F, corresponding binary number " 01011111 "; If the DCN signal that the fax receiving terminal sends, i.e. 0xDF, corresponding binary number " 11011111 ".The DCN signal just allows to send on the speech analog line after being modulated by FSK (Frequency-Shift Keying, frequency shift keying); Wherein, bit " 0 " is modulated into 1850Hz in the pairing eight bit of described DCN, and bit " 1 " is modulated into 1650Hz.
As shown in Figure 1, be a kind of method that detects fax completion that the embodiment of the invention provides, this method, the specific implementation process is as follows:
101: gateway device obtains the pulse code modulation data code stream; Concrete implementation method can increase a FSK probe in the facsimile transmission process, will send to D/A by gateway device, or duplicates out by the pcm stream that A/D sends to gateway device.
102: gateway device carries out demodulation to described pulse code modulation data code stream; In embodiments of the present invention, described described pulse code modulation data code stream is carried out demodulation, be by gateway device with the described pcm stream that duplicates out by the FSK probe, carry out FSK coherent demodulation, thereby obtain the pulse code modulation data code stream after the demodulation.
103:, detect disconnecting signal DCN (disconnect, disconnecting signal) according to the pulse code modulation data code stream after the demodulation;
104:, then determine fax completion if detect described DCN signal in the pulse code modulation data code stream after described demodulation.
Based on above embodiment, be that example is elaborated to a kind of method that detects fax completion that the invention process provides with descending facsimile data handling process.Wherein, described descending facsimile data is for gateway, and the data that exchange layer from core net are called downlink data; Data from PSTN (Public Switched TelephoneNetwork, PSTN) are called upstream data.
In the process that descending facsimile data is handled, gateway device extracts the entrained facsimile data of each IP message that network side sends, by the message decapsulation module the described IP message that receives is reverted to continuous PCM digital code stream, send to digital-to-analogue converter (D/A); By the digital-to-analogue converter pcm stream is converted into audio analog signals then, its concrete signal flows to as shown in Figure 4.In described descending facsimile data handling process, a kind of method that detects fax completion that the invention process provides as shown in Figure 2; This method, the specific implementation process is as follows:
201: send in the process of D/A converter at described pcm stream, gateway device obtains the pulse code modulation data code stream by the FSK probe;
202: gateway device carries out Filtering Processing to described pulse code modulation data code stream; This Filtering Processing process specifically can be carried out DC filtering processing, bandpass filtering treatment according to actual conditions; Wherein, described DC filtering is handled, and is used for eliminating disturbing, and guarantees the antijamming capability of DCN testing result;
It should be noted that, when the method for the detection fax completion that the embodiment of the invention provided is applied to the process of up facsimile data, because up facsimile data is a kind of subscriber line signal that sends to gateway device from user side, this signal can be subjected to more interference, therefore, the described pulse code modulation data code stream that gets access to was being needed it is carried out filtering before demodulation process, filtering the bell signal of the direct current signal, low-frequency noise signal and the 450Hz that are mixed with in the fsk signal.
Described bandpass filtering treatment, in order to guarantee effectively to detect the described pulse code modulation data code stream that gets access to, be modulated into 1850Hz according to bit " 0 " in the pairing eight bit of described DCN signal, bit " 1 " is modulated into 1650Hz, the described pulse code modulation data code stream that gets access to is carried out the bandpass filtering of 1550Hz～1950Hz, noise jamming outside the non-FSK modulating frequency of filtering, thus avoid being subjected to the signal outside the voice band to disturb.
203: gateway device carries out automatic gain control to described pulse code modulation data code stream through Filtering Processing.This step has been finished the bandpass filtering automatic gain control of pulse code modulation data code stream afterwards, makes that entering described step 204 carries out the demodulated data code stream within a certain scope, guarantees can stablize the output testing result after the demodulation.
204: gateway device carries out demodulation to described pulse code modulation data code stream; This demodulating process is specifically as follows:
Step 1: described pulse code modulation data code stream is carried out delay filtering handle;
Step 2: the described pulse code modulation data code stream of handling through delay filtering is correlated with multiplies each other;
Step 3: the pulse code modulation data code stream after described the multiplying each other is carried out low-pass filtering treatment, thereby obtain a string initial data, can retrieve the DCN signal from this string data by the DCN searching algorithm by the described a string initial data that gets access to, its concrete testing process is as described in the step 205.
Need to prove, described delay filtering is handled, is multiplied each other and low-pass filtering treatment has been finished the coherent demodulation of pulse code modulation data code stream jointly, its demodulation output result's sign corresponding to pulse code modulation data is: demodulation output result's signal amplitude is for over against should described pulse code modulation data 1, and demodulation output result's signal amplitude is negative corresponding described pulse code modulation data 0.
205: according to the pulse code modulation data code stream after the demodulation, gateway device detects disconnecting signal; Wherein, the frame structure of described disconnecting signal DCN as shown in Figure 6, this frame is HDLC (High Level Data LinkControl, High level data link control) frame specifically comprises: first Flag field, Address field, Control field, DCN field, FCS field, tail Flag field.
If the transmission rate of establishing between described facsimile transmission end and the fax receiving terminal is 300bps, the width that corresponds to 1 Bit data probably is 3333 microseconds, i.e. [1/ (300bps) second]; If described gateway device adopts the sample frame at described disconnecting signal DCN place of the sample rate of 8000 bits per seconds, the general every sampling 26.667[8000bps/300bps of then described gateway device] individual point just can sample 1 Bit data in the described frame; Wherein, the width of 1 Bit data is 125 microseconds in the gateway device, i.e. [1/ (8000bps) second]; Like this, just can obtain corresponding about 26 sampled points of 1 Bit data in the described frame; 0.5 Bit data corresponding about 13 or 14 sampled points, corresponding about 40 sampled points of 1.5 Bit datas in the described frame, corresponding about 53 sampled points of 2 Bit datas, by that analogy.Two registers are set: 0 register and 1 register in described gateway device; Wherein, 0 register is used to write down corresponding to the sampled point counting of FSK demodulation output less than 0 o'clock; 1 register is used for corresponding output greater than 0 sampled point through the FSK demodulation to be counted.
Need to prove, the corresponding actual data " 0 " of the value of described register and the promptly actual data " 0 " and the pairing sampling number of data " 1 " of width of data " 1 ", that is to say that the width that receives data " 0 " and data " 1 " by counter records is determined the data " 0 " that receive and the number of data " 1 ".
With reference to Fig. 5, in embodiments of the present invention, the method that gateway device detects disconnecting signal comprises:
Step 1: the beginning flag that detects described disconnecting signal place frame;
In embodiments of the present invention, the beginning flag of frame described in this step is meant the data message in its first Flag field; Be concretely, exactly that gateway device detects pulse code modulation data code stream 7 0x7E of continued presence whether after the described demodulation? if find 7 0x7E, then 0 register and 1 register and DCN sign are emptied; Continue the judgement of step 2; If do not find 7 0x7E, then continue to add up by 0 register and 1 register.
Step 2: detect described frame beginning flag, then continue to detect the address field information and the control field information of described disconnecting signal place frame; This step specifically also can be added up judgement by 0 counter and 1 counter.Wherein, the address field information of described frame and control field information are " 1111111111001000 "; Owing to stipulate in the HDLC agreement, when transmitting terminal needs to send continuously data " 1 " more than 5, in the process that sends, need insert one 0 every 51, receiving terminal can discern accordingly and delete that described transmitting terminal inserts 0 when receiving.Like this, the code stream when the address field information of described frame and control field information " 1111111111001000 " send should be " 11111
011111
000100 " wherein, the 6th " 0 " inserts " 0 with the 12nd " 0 " according to the HDLC agreement.Like this, when gateway device by 1 counter records " 1 " and number and the number of 0 counter records " 0 " judge that it receives a string " 11111
011111
000100 ", then thinks address field information and the control field information that detects described disconnecting signal place frame.
Need to prove that this step is more accurate in order to ensure detected DCN signal, can be chosen in step and carry out after detecting the beginning flag of described disconnecting signal place frame.Like this,, and do not detect the address field information and the control field information of described disconnecting signal place frame, then can select to restart to detect beginning flag when the beginning flag that detects described disconnecting signal place frame.
Step 3: if detect described address field information and control field information, then continue to detect described disconnecting signal, provide testing result.Wherein, include the sign that detects the DCN signal in the described check result.Based on the structure of the above DCN signal place frame, the embodiment of the invention can be after address field information that detects described frame and control field information, and whether low 16 that continue the described frame of detection be 0x885F or 0x88DF; If low 16 of described frame is 0x885F or 0x88DF, then think to have detected disconnecting signal DCN.Wherein, the sign of described detected DCN signal can be used as testing result.
206: if detect the DCN signal in the pulse code modulation data code stream after described demodulation, then gateway device is determined fax completion.
It should be noted that this method can also comprise:
Gateway device reports net control device with described testing result.
Need to prove that described counter can directly carry out the individual counting number of data " 0 " and " 1 ", can also count by record data " 0 " and " 1 " corresponding employing its number is added up.Wherein, according to data " 0 " and " 1 " corresponding adopt to count carry out the mode that data " 0 " and " 1 " number are added up, the value that can also pre-set register is less than 13, promptly the sampled point number is then thought interference signal less than 13; The value of register is greater than 14 but less than 37, promptly greater than 0.5 Bit data less than 1.5 Bit datas, then think 1 Bit data; The value of register is greater than 43 but less than 64, then thinks 2 Bit datas, and all the other by that analogy.Pre-set by described, can improve antijamming capability.
It is also to be noted that, when being example with up facsimile data, to obtain the pulse code modulation data code stream be to be duplicated out from A/D converter sends to the pcm stream of gateway device by the FSK probe to gateway device in a kind of method that detects fax completion that the embodiment of the invention provides, other flow processs and descending facsimile data are that the flow process of example is identical, repeat no more herein.
As shown in Figure 3, be a kind of device that detects fax completion that the embodiment of the invention provides, this device comprises:
Code stream acquiring unit 301 is used to obtain the pulse code modulation data code stream;
Demodulating unit 302 is used for described pulse code modulation data code stream is carried out demodulation;
Detecting unit 303 is used for according to the pulse code modulation data code stream after the demodulation, detects disconnecting signal;
If detect the DCN signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.
Wherein, described demodulating unit 302 comprises:
The delay filtering subelement is used for that described pulse code modulation data code stream is carried out delay filtering and handles;
The subelement that multiplies each other is used for the described pulse code modulation data code stream of handling through delay filtering is correlated with and multiplies each other;
The low-pass filtering subelement is used for the pulse code modulation data code stream after described the multiplying each other is carried out low-pass filtering treatment.
Wherein, described detecting unit 303 comprises:
The beginning flag detection sub-unit is used to detect the beginning flag of described disconnecting signal place frame;
The disconnecting signal detection sub-unit if be used for detecting described beginning flag, then continues to detect described disconnecting signal, provides testing result.
Described detecting unit 303 can also comprise:
The information detection sub-unit is used to detect described beginning flag, then continues to detect the address field information and the control field information of described disconnecting signal place frame;
Described disconnecting signal detection sub-unit if be used for detecting described address field information and control field information, then continues to detect described disconnecting signal, provides testing result.
It should be noted that this device can also comprise:
Filter unit 304 is used for described pulse code modulation data code stream is carried out Filtering Processing;
Automatic gain control unit 305 carries out automatic gain control to described pulse code modulation data code stream through Filtering Processing.
It is also to be noted that this device also comprises:
Testing result reports unit 306, is used for described testing result is reported net control device.
A kind of method and device that detects fax completion that the embodiment of the invention provides is by obtaining the pulse code modulation data code stream; Described pulse code modulation data code stream is carried out demodulation; According to the pulse code modulation data code stream after the demodulation, detect disconnecting signal; If detect the DCN signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.Because gateway device has adopted detection DCN signal to determine fax completion in the embodiment of the invention, so that gateway device can be judged the facsimile transmission end accurately and the fax completion between the receiving terminal of faxing.Because after gateway device detected described DCN signal, just the testing result with the described DCN of detecting signal reported net control device, thereby makes net control device can in time know the fax completion state in the embodiment of the invention.
Through the above description of the embodiments, one of ordinary skill in the art will appreciate that: realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, also can directly finish by programmable chips such as hardware circuit such as asic chip and FPGA/CPLD, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise step as above-mentioned method embodiment, described storage medium, as: ROM/RAM, magnetic disc, CD etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. a method that detects fax completion is characterized in that, comprising:
Obtain the pulse code modulation data code stream;
Described pulse code modulation data code stream is carried out demodulation;
According to the pulse code modulation data code stream after the demodulation, detect disconnecting signal;
If detect described disconnecting signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.
2. the method for detection fax completion according to claim 1 is characterized in that, described described pulse code modulation data code stream is carried out also comprising before the demodulation step:
Described pulse code modulation data code stream is carried out Filtering Processing;
Described pulse code modulation data code stream through Filtering Processing is carried out automatic gain control.
3. the method for detection fax completion according to claim 2 is characterized in that, the described step that described pulse code modulation data code stream is carried out demodulation comprises:
Described pulse code modulation data code stream is carried out delay filtering to be handled;
The described pulse code modulation data code stream of handling through delay filtering is correlated with multiplies each other;
Pulse code modulation data code stream after described the multiplying each other is carried out low-pass filtering treatment.
4. according to the method for any described detection fax completion in the claim 1 to 3, it is characterized in that described according to the pulse code modulation data code stream after the demodulation, the step of detection disconnecting signal comprises:
Detect the beginning flag of described disconnecting signal place frame;
If detect described beginning flag, then continue to detect described disconnecting signal, provide testing result.
5. the method for detection fax completion according to claim 4 is characterized in that, if describedly detect described beginning flag, then continues to detect described disconnecting signal, provides the step of testing result, also comprises:
Detect described beginning flag, then continue to detect the address field information and the control field information of described disconnecting signal place frame;
If detect described address field information and control field information, then continue to detect described disconnecting signal, provide testing result.
6. a device that detects fax completion is characterized in that, comprising:
The code stream acquiring unit is used to obtain the pulse code modulation data code stream;
Demodulating unit is used for described pulse code modulation data code stream is carried out demodulation;
Detecting unit is used for according to the pulse code modulation data code stream after the demodulation, detects disconnecting signal; If detect described disconnecting signal in the pulse code modulation data code stream after described demodulation, then determine fax completion.
7. the device of detection fax completion according to claim 6 is characterized in that, this device also comprises:
Filter unit is used for described pulse code modulation data code stream is carried out Filtering Processing;
Automatic gain control unit carries out automatic gain control to described pulse code modulation data code stream through Filtering Processing.
8. the device of detection fax completion according to claim 7 is characterized in that, described demodulating unit comprises:
The delay filtering subelement is used for that described pulse code modulation data code stream is carried out delay filtering and handles;
The subelement that multiplies each other is used for the described pulse code modulation data code stream of handling through delay filtering is correlated with and multiplies each other;
The low-pass filtering subelement is used for the pulse code modulation data code stream after described the multiplying each other is carried out low-pass filtering treatment.
9. according to the device of any described detection fax completion in the claim 6 to 8, it is characterized in that described detecting unit comprises:
The beginning flag detection sub-unit is used to detect the beginning flag of described disconnecting signal place frame;
The disconnecting signal detection sub-unit if be used for detecting described beginning flag, then continues to detect described disconnecting signal, provides testing result.
10. the device of detection fax completion according to claim 9 is characterized in that, described detecting unit also comprises:
The information detection sub-unit is used to detect described beginning flag, then continues to detect the address field information and the control field information of described disconnecting signal place frame;
Described disconnecting signal detection sub-unit if be used for detecting described address field information and control field information, then continues to detect described disconnecting signal, provides testing result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010114825 CN101795341A (en) | 2010-02-26 | 2010-02-26 | Method and device for detecting fax completion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010114825 CN101795341A (en) | 2010-02-26 | 2010-02-26 | Method and device for detecting fax completion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101795341A true CN101795341A (en) | 2010-08-04 |
Family
ID=42587757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010114825 Pending CN101795341A (en) | 2010-02-26 | 2010-02-26 | Method and device for detecting fax completion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101795341A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110570881A (en) * | 2019-08-05 | 2019-12-13 | 深圳震有科技股份有限公司 | method, apparatus, device and medium for switching back to voice mode in facsimile transparent transmission mode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08116379A (en) * | 1994-10-13 | 1996-05-07 | Fuji Xerox Co Ltd | Facsimile equipment |
| WO1997023113A1 (en) * | 1995-12-18 | 1997-06-26 | Paradyne Corporation | Bypassing a modem pool during a fax transmission |
| JPH09186839A (en) * | 1995-12-27 | 1997-07-15 | Fuji Xerox Co Ltd | Facsimile equipment |
| JPH10107996A (en) * | 1996-10-02 | 1998-04-24 | Oki Data:Kk | Detector for wrong dialing |
| CN1812357A (en) * | 2005-01-26 | 2006-08-02 | 华为技术有限公司 | Method for assuring clearing command reliable thansmision tofacsimile by T.38 gateway |
-
2010
- 2010-02-26 CN CN 201010114825 patent/CN101795341A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08116379A (en) * | 1994-10-13 | 1996-05-07 | Fuji Xerox Co Ltd | Facsimile equipment |
| WO1997023113A1 (en) * | 1995-12-18 | 1997-06-26 | Paradyne Corporation | Bypassing a modem pool during a fax transmission |
| JPH09186839A (en) * | 1995-12-27 | 1997-07-15 | Fuji Xerox Co Ltd | Facsimile equipment |
| JPH10107996A (en) * | 1996-10-02 | 1998-04-24 | Oki Data:Kk | Detector for wrong dialing |
| CN1812357A (en) * | 2005-01-26 | 2006-08-02 | 华为技术有限公司 | Method for assuring clearing command reliable thansmision tofacsimile by T.38 gateway |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110570881A (en) * | 2019-08-05 | 2019-12-13 | 深圳震有科技股份有限公司 | method, apparatus, device and medium for switching back to voice mode in facsimile transparent transmission mode |
| CN110570881B (en) * | 2019-08-05 | 2022-07-22 | 深圳震有科技股份有限公司 | Method, apparatus, device and medium for switching back to voice mode in facsimile transparent transmission mode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20110298616A1 (en) | Alarm monitoring telecommunications line condition detection and automatic calibration | |
| EP1115234A1 (en) | A mobile station with a selection between two equalisers | |
| US20040124996A1 (en) | Data transmission apparatus and method | |
| CN108540244A (en) | Pre emphasis factor test method, device and communication equipment | |
| CN101795341A (en) | Method and device for detecting fax completion | |
| JP4527345B2 (en) | Apparatus and method for adjusting input gain for multiple signal formats in a data network | |
| CN102131206A (en) | Measurement method and user equipment | |
| CN106330712B (en) | A kind of control method and device of MAC address learning | |
| CN112202421B (en) | Serial port signal filtering method and device | |
| US6668032B1 (en) | Device and method for signal sampling at multiple clock rates | |
| EP2755343A1 (en) | System and mobile terminal using data fragmentation | |
| US6617917B2 (en) | Caller-ID demodulation apparatus and method using multiple thresholds | |
| US20190208433A1 (en) | Network path selection method and network node device using the same | |
| CN101115100B (en) | Apparatus and method for computer to obtain or control working condition of phone line through sound card | |
| WO2002011377A9 (en) | Current mode transmission | |
| CN100403746C (en) | Frequency-shift-key adaptable decoding method and device | |
| US6154724A (en) | Energy based pulse position detector for telephone wire networks | |
| CN109996312B (en) | Wireless hotspot operation method | |
| CN103795872A (en) | Circuit detection method and device | |
| CN201114289Y (en) | Computer device for acquiring or controlling telephone line operating status by sound card | |
| EP0387839B1 (en) | MSK signal detector | |
| CN206077523U (en) | A kind of network system for monitoring fax line recording audio | |
| CN105578429A (en) | Conversation method, calling terminal equipment and called terminal equipment | |
| KR100187744B1 (en) | A mobile telephone receiver with adaptively inserted if filter and an if filter inserting method | |
| TWI302061B (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20100804 |