CN1964405A - A method to eliminate echo number-receiving and conference system - Google Patents
A method to eliminate echo number-receiving and conference system Download PDFInfo
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- CN1964405A CN1964405A CN 200610160843 CN200610160843A CN1964405A CN 1964405 A CN1964405 A CN 1964405A CN 200610160843 CN200610160843 CN 200610160843 CN 200610160843 A CN200610160843 A CN 200610160843A CN 1964405 A CN1964405 A CN 1964405A
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Abstract
The disclosed method for eliminating echo signal comprises: calculating energy for received number signal; according to received signal, analyzing the number and recording the receiving time; comparing the signal energy and time between current number and last number, if the energy difference over a threshold while the time difference less time threshold, determining the received number as echo, and removing the echo. This invention is well efficient.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of method and a kind of conference system of eliminate echo number-receiving.
Background technology
Along with the development of society, the frequent at work application phone meeting of people replaces traditional conferencing form, to save cost.General TeleConference Bridge comprises conference management unit, meeting audio mixing processing unit and signal tone detecting unit.Seeing also Fig. 1, is that existing TeleConference Bridge is used schematic diagram.Comprise conference system, switch and participant side among the figure.Participant can be to be linked into conference system by switch.Meeting audio mixing processing unit is realized the function of audio mixing and distribution, a plurality of users' sound mix can be sent to each participant side together.The signal tone detecting unit is realized participant side's input signal is carried out the function that number detects.The controlled function to the meeting-place is realized in the conference management unit.
When carrying out meeting, the participant square tube is crossed the mode of dialing, is linked into conference system through switch, connects; The speech of participant side or the signal of button generally are dual tone multi-frequency dtmf (Dual-Tone Multifrequency) signals at this moment, can be input to meeting audio mixing processing unit, also are input to the signal tone detecting unit simultaneously; The signal tone detecting unit detects the signal of participant side's input, analyzes participant side's number according to detected push button signalling wherein, and the participant side's number that obtains is reported the conference management unit; The participant side's number that conference management unit received signal sound detecting unit reports and the state information of meeting audio mixing processing unit, described state information comprises in the participant side's information, participant side of definite adding meeting which makes a speech or information such as listen to, and meeting audio mixing processing unit is controlled again; Meeting audio mixing processing unit carries out audio mixing to the input audio signal of participant side, again audio mixing is distributed to each participant side.
The access of conference system participant side adopts 2/4 conversion hybrid coil to realize the conversion of two or four lines usually.So-called two or four lines conversion, promptly in common exchanging telephone network PSTN (Public Switched TelephoneNetwork), signal adopts 4 lines transmission (receiving and transmitting signal is separately respectively used a signal line, adds two ground wires, is collectively referred to as 4 lines) usually; Simultaneously, user terminal generally is by 2 lines (same signal line is used in transmitting-receiving, add a ground wire again, is collectively referred to as 2 lines) access communications network, is implemented in the signal that transmits among the PSTN and the conversion of user terminal signal.But adopt 2/4 conversion hybrid coil to realize the conversion of two or four lines, hybrid coil wherein can not be realized received signal and send Signal Spacing that the signal of i.e. user's reception can produce leakage fully because impedance does not match, the signal that leaks can feed back to transmit leg, thereby produces echo.In videoconference, when if certain participant side need carry out dial-up operation, the signal of button can be delivered to the signal tone detecting unit, also can deliver to simultaneously meeting audio mixing processing unit, meeting audio mixing processing unit is distributed to other participant sides to the signal of button, the echo that these participant side's hybrid coils leak can enter into the signal tone detecting unit, if the echo that leaks has enough energy, then might cause the situation of the number of overcharging.For example certain participant side is according to number 8 o'clock, and then conference system might detect each user all by button 8, is which participant side's button thereby can't recognize the end.
For addressing the above problem, existing method one is in conference system, is the channel arrangement Echo Canceller of each participant side.Seeing also Fig. 2, is the conference call application schematic diagram that adopts Echo Canceller.When making in this way, suppose that participant side A carries out the signal that button produces button, this push button signalling is distributed to participant side B and C by meeting audio mixing processing unit and signal tone detecting unit, although 2/4 conversion hybrid coil of B and C side produces echo, but before its echo enters meeting audio mixing processing unit and signal tone detecting unit, the quilt Echo Canceller of passage has separately been eliminated, not the situation that can occur repeatedly collecting the digits in the meeting-place.
When using the method, can solve the situation that repeatedly collects the digits that produces owing to echo in the meeting-place, but needing to use hardware EC (Echo Canceller) device in this method is Echo Canceller, cost is than higher, if do not use hardware but use dsp software to realize the EC function at meeting audio mixing processing unit and signal tone detecting unit, though can reduce some costs, but the resource that the EC algorithm takies is bigger, for example: the EC algorithm of supporting the 64ms tail to delay time needs the operand of 8MIPS, when supporting 100 sides' meeting if desired, then the EC algorithm has just taken the operand of 800MIPS.Therefore use the EC algorithm can directly have influence on the participant number formulary that realizes videoconference in the conference system, indirect raising the cost on every road, reduced the integrated level of system.
For solving the defective of existing method one, existing method two proposes a kind of scheme that does not need Echo Canceller or EC algorithm, promptly use DTMF to close the method for sound, in the signal tone detecting unit, earlier dtmf signal is carried out in the input of each participant side in real time and detect, if dtmf signal, in the time that dtmf signal continues, meeting audio mixing processing unit then carries out quiet processing to the input of this passage, till detection is not dtmf signal.Processing just makes dtmf signal can not participate in audio mixing like this, can not be sent to other participant sides, therefore also can not produce echo, the problem of echo number-receiving can not occur, thereby reduce cost, can realize that also more participant sides participate in a conference.
But when adopting method two, because from dtmf signal input meeting audio mixing processing unit and signal tone detecting unit, really need certain algorithm time-delay for dtmf signal to detecting this signal, this section period does not have detected dtmf signal to bleed to participate in audio mixing in meeting audio mixing processing unit, be sent to other participant sides, its echo still might be detected, and can not realize the purpose of eliminate echo number-receiving fully.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and conference system of eliminate echo number-receiving, with eliminate echo number-receiving.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method of eliminate echo number-receiving, comprising: the numerical signal that receives is carried out energy calculate, obtain signal energy; Analyze number and recorder time according to the numerical signal that receives; Relatively this receiving number and last time receiving number signal energy and time of reception, if the signal energy difference between them is greater than being provided with threshold value, and the time of reception difference is confirmed that then this receiving number is an echo number-receiving, and is abandoned this number less than duration is set.
Wherein, described signal energy computation is: current time length is that time span that the signal energy value of T equals signal energy value that current time length is T0 and last computation is that the difference of the signal energy value of T multiply by less than behind 1 the coefficient, with the time span of last computation be T the addition of signal energy value and, described T0 is less than T.
Wherein, described signal energy computation also can for: current demand signal energy value equal current time length be T0 signal energy value and time-delay buffering area the total signal energy value and, the time span that deducts again in the time-delay buffering area the earliest is the signal energy value of T0.
Described more specific for relatively receiving this receiving number and last time and the signal energy and the time of reception of the number identical with this receiving number.
Described relatively taking a step forward comprises: judge this receiving number and last time receiving number the time of reception difference whether less than duration is set, if enter described comparison procedure.
Accordingly, the invention provides a kind of conference system, comprising: energy detection unit, analysis and processing unit, energy comparing unit, time comparing unit and processing unit; Energy detection unit is used for that the numerical signal that receives is carried out energy and calculates, and obtains signal energy; Analysis and processing unit is used for analyzing number according to the numerical signal of described reception, and the recorder time, and described number and time of reception thereof are reported the time comparing unit, and described number and signal energy thereof are reported the energy comparing unit; The energy comparing unit is used for that this receiving number of comparison and last time receive and the signal energy of the number identical with this receiving number; The time comparing unit is used for that this receiving number of comparison and last time receive and the time of reception of the number identical with this receiving number; Processing unit, be used for comparing the signal energy difference of described number greater than threshold value is set at the energy comparing unit, and the time comparing unit compares the time of reception difference of described number and confirm that this receiving number is an echo number-receiving after duration is set, and abandons this number.
Optionally, described energy detection unit comprises first memory cell, second memory cell, the 3rd memory cell and computing unit; First memory cell, the time span that is used to store last computation is the signal energy value of T; Second memory cell is used to store the signal energy value that current time length is T0; Computing unit, the time span that is used for current time length with second cell stores and is the last computation of the signal energy value of T0 and first cell stores is that the difference of the signal energy value of T multiply by less than behind 1 the coefficient, with the time span of the last computation of first cell stores be the signal energy value addition of T, obtaining current time length is the signal energy value of T; The 3rd memory cell is used to store the described current time length that obtains the signal energy value that is T.
Optionally, described energy detection unit comprises first memory cell, second memory cell, the 3rd memory cell and computing unit; First memory cell is used for storing the total signal energy value of time-delay buffering area and the buffering area time span the earliest of delaying time is the signal energy value of T0; Second memory cell is used to store the signal energy value that current time length is T0; Computing unit, be used for current time length with second cell stores and be the total signal energy value addition of the time-delay buffering area of the signal energy value of T0 and first cell stores, the time span that deducts again in the time-delay buffering area of first cell stores the earliest is the signal energy value of T0, obtains the current demand signal energy value; The 3rd memory cell is used to store the described current demand signal energy value that obtains.
Optionally, described system further comprises judging unit, be used to judge this receiving number and last time receiving number the time of reception difference whether less than duration is set, if, again by energy comparing unit and time comparing unit relatively this receiving number received with last time and the signal energy and the time of reception of the number identical with this receiving number.
Above technical scheme is as can be seen:
Among the present invention, calculate, analyze number and recorder time according to numerical signal by the numerical signal that receives is carried out energy; Relatively this receiving number and last time receiving number signal energy and time of reception, if the signal energy difference between them is greater than being provided with threshold value, and the time of reception difference then confirms as echo number-receiving less than duration is set, and abandons this number.Because signal energy difference and time of reception that the present invention has taken all factors into consideration between echo number-receiving and the right number are poor, thereby can accurately judge echo number-receiving, have overcome the defective that prior art may be brought, and can better realize eliminate echo number-receiving.
Description of drawings
Fig. 1 is that existing TeleConference Bridge is used schematic diagram;
Fig. 2 is the conference call application schematic diagram of available technology adopting Echo Canceller;
Fig. 3 is the flow chart of eliminate echo number-receiving method first embodiment of the present invention;
Fig. 4 is the flow chart of eliminate echo number-receiving method second embodiment of the present invention;
Fig. 5 judges the echo number-receiving particular flow sheet in the eliminate echo number-receiving method of the present invention;
Fig. 6 is a conference system schematic diagram of the present invention;
Fig. 7 is the structural representation of energy detection unit in the conference system of the present invention.
Embodiment
The invention provides a kind of method of eliminate echo number-receiving, it mainly is to utilize the signal energy difference of number and time of reception difference to judge echo number-receiving and abandon, and promptly the numerical signal that receives is carried out energy and calculates, and obtains signal energy; Analyze number and recorder time according to the numerical signal that receives; Relatively this receiving number and last time receiving number signal energy and time of reception, if the signal energy difference between them is greater than being provided with threshold value, and the time of reception difference is confirmed that then this receiving number is an echo number-receiving, and is abandoned this number less than duration is set.
Seeing also Fig. 3, is the flow chart of eliminate echo number-receiving method first embodiment of the present invention, comprises step:
A1, employing iterate mode signal calculated energy;
Behind the receiving number signal, carry out signal energy computation.
The present invention adds a numerical signal to the input of participant side at the signal tone detecting unit and carries out the energy detection unit that energy calculates, and signal energy adopts the method that iterates to calculate.The method of specific implementation is as follows:
EnyT(n)＝EnyT(n-1)+[EnyT0(n)-EnyT(n-1)]×deta
Wherein EnyT (n) is the n moment, and duration is the short-time average energy of the signal of T; EnyT (n-1) expression n-1 duration constantly is the short-time average energy of the signal of T; EnyT0 (n) is the n moment, and duration is the short-time average energy of the signal of T0; T0＜T wherein, the value of T0 and T can be selected as required; Deta＜1.The signal short-time average energy value that the implication of this computing formula is current in other words, the difference that equals the short-time average energy value (EnyT (n-1)) of interior short-time average energy value of calculating (EnyT0 (n)) of present a period of time (T0) and last computation multiply by a coefficient (deta), adds time short-time average energy value (EnyT (n-1)) of calculating.
A2, the signal energy that reports number, number and time stamp;
The signal tone detecting unit is to the detection that collects the digits of the input signal of each participant side, analyze participant side by be what number, obtain the number of participant side, and write down this number and receive time stamp, described time stamp is to be used for record when to receive number.The signal tone detecting unit reports the conference management unit with channel number of the signal energy of number, number, the time stamp of receiving number and number etc.
A3, judge the echo number according to the signal energy difference and the receiving number time difference of number, and it is abandoned.
It is that user key-press produces that the number of being received will be judged according to the signal energy difference of number and receiving number time difference in the conference management unit, or echo number-receiving.Generally in same meeting-place, hardly may by the possibility of same button simultaneously in participant side, and the signal energy of button side will be much larger than the backward energy of echo number, therefore by this condition and in conjunction with time difference of receiving number, can judge whether the number of being received is echo number-receiving.
Detailed process sees also Fig. 5, is the particular flow sheet of judging echo number-receiving in the eliminate echo number-receiving method of the present invention.
In the conference management unit, for setting up the judgement formation that collects the digits in each meeting-place, be used to store the number structure that reports, this structure comprises number, number energy, time stamp, channel number, collects the digits to judge the number structure that formation adopts the storage mode storage of first in first out to report.
Specifically comprise step among Fig. 5:
The information that the signal tone detecting unit reports is received in C1, conference management unit;
The time stamp of the packets of information bracket sign indicating number that the signal tone detecting unit reports to the conference management unit, the signal energy of number, number, channel number etc.
C2, conference management unit judges be current to receive that whether the time difference of time of number and last time receiving number is greater than first threshold value;
Set one first threshold T 1, the T1 time collect the digits for the circuit maximum delay adds the algorithm time and.Circuit delay is the time-delay that transmission line causes, the algorithm that collects the digits time-delay be the signal analysis from circuit go out participant side by be the needed time of what number.Actual when judging, estimate good maximum circuit delay earlier and the algorithm time-delay that collects the digits.
When the number that the signal tone detecting unit reports is received in the conference management unit, judge that whether the time difference of current time of receiving number and last time receiving number is greater than first threshold T 1, as if the number in the judgement formation that collects the digits of then falling its meeting-place, place greater than T1 clearly, promptly enter step C3, if less than T1, enter step C4;
C3, fall collecting the digits of its meeting-place, place clearly and judge and number in the formation to enter step C9;
C4, judge that current the collecting the digits of number and meeting-place, place of receiving judge whether the number in the formation has identical number;
Judge in the formation do not have number identical if collect the digits, enter step C9,, enter step C5 if duplicate numbers is arranged with the current number of receiving;
Whether the energy difference between the signal energy of C5, the signal energy of judging duplicate numbers in the judgement formation that collects the digits and the current number of receiving is greater than the second threshold value E1;
If energy difference between the two enters step C6 greater than the second threshold value E1, if energy difference between the two enters step C8 less than the second threshold value E1;
The value of the second threshold value E1 can be determined according to device parameter, 2/4 line reset coil in user's plate of regular phone machine, a definite echo attenutation coefficient is arranged, can determine the value of E1 according to this coefficient, the echo attenutation of the user's plate that for example has is 13dB.
C6, judge and currently receive that whether the time difference of receiving number and last time duplicate numbers is greater than T1;
If both time difference greater than T1, enters step C8, if both time differences less than T1, enter step C7;
C7, think that this number is an echo number-receiving, abandon this number, and finish;
C8, the part of from the judgement formation that collects the digits, deleting duplicate numbers last time;
C9, the number of newly receiving entered into to collect the digits judge formation;
C10, acknowledge receipt of number.
The present invention also provides another embodiment that realizes eliminate echo number-receiving, and the difference of itself and the above-mentioned embodiment that describes is different when the signal calculated energy, and other steps are basic identical.
Seeing also Fig. 5, is the flow chart of eliminate echo number-receiving method second embodiment of the present invention, comprises step:
B1, employing sliding window mode signal calculated energy;
Behind the receiving number signal, carry out signal energy computation.
The present invention adds an energy detection unit that participant side's input signal is carried out energy calculating at the signal tone detecting unit, and signal energy adopts the sliding window mode to calculate.The method of specific implementation is as follows:
Use a time-delay buffer queue to be used for the storage signal energy value, adopt the principle of first in first out to upgrade the time-delay buffer queue.Then adopt the mode of sliding window to draw the signal energy value for signal energy computation, that is to say, the energy value of current demand signal equals the signal total energy value that signal energy value in nearest a period of time T0 adds the time-delay buffering area, and the time span that deducts again in the time-delay buffering area the earliest is the signal energy value of T0.Then, upgrade the time-delay buffering area, the signal energy value that has just calculated is replaced the energy value of whole buffering area.
Need to prove that the present invention is not limited to adopt the method signal calculated energy of introducing in sliding window mode or the method one that iterates, and also can adopt additive method signal calculated energy.
B2, the signal energy that reports number, number and time stamp;
The signal tone detecting unit is to the detection that collects the digits of the input signal of each participant side, analyze participant side by be what number, obtain the number of participant side, and write down this number and receive time stamp, described time stamp is to be used for record when to receive number.The signal tone detecting unit reports the conference management unit with channel number of the signal energy of number, number, the time stamp of receiving number and number etc.
B3, judge the echo number according to the signal energy difference and the receiving number time difference of number, and it is abandoned.
It is that user key-press produces that the number of being received will be judged according to the signal energy difference of number and receiving number time difference in the conference management unit, or echo number-receiving.Generally in same meeting-place, hardly may by the possibility of same button simultaneously in participant side, and the signal energy of button side will be much larger than the backward energy of echo number, therefore by this condition and in conjunction with time difference of receiving number, can judge whether the number of being received is echo number-receiving.
Detailed process sees also Fig. 5, is the particular flow sheet of judging echo number-receiving in the eliminate echo number-receiving method of the present invention.
In the conference management unit, for setting up the judgement formation that collects the digits in each meeting-place, be used to store the number structure that reports, this structure comprises number, number energy, time stamp, channel number, collects the digits to judge the number structure that formation adopts the storage mode storage of first in first out to report.Need to prove that the present invention is not limited to adopt formation form number storing information, also can adopt other modes to store.
Specifically comprise step among Fig. 5:
The information that the signal tone detecting unit reports is received in C1, conference management unit;
The time stamp of the packets of information bracket sign indicating number that the signal tone detecting unit reports to the conference management unit, the signal energy of number, number, channel number etc.
C2, conference management unit judges be current to receive that whether the time difference of time of number and last time receiving number is greater than first threshold value;
Set one first threshold T 1, the T1 time collect the digits for the circuit maximum delay adds the algorithm time and.Circuit delay is the time-delay that transmission line causes, the algorithm that collects the digits time-delay be the signal analysis from circuit go out participant side by be the needed time of what number.Actual when judging, estimate good maximum circuit delay earlier and the algorithm time-delay that collects the digits.
When the number that the signal tone detecting unit reports is received in the conference management unit, judge that whether the time difference of current time of receiving number and last time receiving number is greater than first threshold T 1, as if the number in the judgement formation that collects the digits of then falling its meeting-place, place greater than T1 clearly, promptly enter step C3, if less than T1, enter step C4;
C3, fall collecting the digits of its meeting-place, place clearly and judge and number in the formation to enter step C9;
C4, judge that current the collecting the digits of number and meeting-place, place of receiving judge whether the number in the formation has identical number;
Judge in the formation do not have number identical if collect the digits, enter step C9,, enter step C5 if duplicate numbers is arranged with the current number of receiving;
Whether the energy difference between the signal energy of C5, the signal energy of judging duplicate numbers in the judgement formation that collects the digits and the current number of receiving is greater than the second threshold value E1;
If energy difference between the two enters step C6 greater than the second threshold value E1, if energy difference between the two enters step C8 less than the second threshold value E1;
The value of the second threshold value E1 can be determined according to device parameter, 2/4 line reset coil in user's plate of regular phone machine, a definite echo attenutation coefficient is arranged, can determine the value of E1 according to this coefficient, the echo attenutation of the user's plate that for example has is 13dB.
C6, judge and currently receive that whether the time difference of receiving number and last time duplicate numbers is greater than T1;
If both time difference greater than T1, enters step C8, if both time differences less than T1, enter step C7;
C7, think that this number is an echo number-receiving, abandon this number, and finish;
C8, the part of from the judgement formation that collects the digits, deleting duplicate numbers last time;
C9, the number of newly receiving entered into to collect the digits judge formation;
C10, acknowledge receipt of number.
Need to prove that the order of above-mentioned steps C5 and C6 can be adjusted, promptly can advanced row judge the step C6 of the time difference of receiving number, judge the step C5 of the signal energy difference of receiving number again, the present invention is not limited this.
More than the method for eliminate echo number-receiving provided by the invention has been done detailed introduction, corresponding, the invention provides a kind of conference system, this conference system can eliminate echo number-receiving.
Seeing also Fig. 6, is conference system schematic diagram of the present invention.
Conference system comprises signal tone detecting unit 100, conference management unit 200.
Signal tone detecting unit 100 comprises energy detection unit 101 and analysis and processing unit 102; Energy detection unit 101 is used for that the numerical signal that receives is carried out energy and calculates, and obtains signal energy, and numerical signal is meant the signal of button, generally is dual tone multi-frequency dtmf (Dual-Tone Multifrequency) signal; Analysis and processing unit 102, be used for the detection that collects the digits of input signal to each participant side of videoconference, analyze number according to numerical signal, and the recorder time, the signal energy of received energy detecting unit 101 outputs, number and time of reception thereof, signal energy are reported conference management unit 200, specifically be that number and time of reception thereof are reported time comparing unit 202 in the conference management unit 200, number and signal energy thereof are reported energy comparing unit 201 in the conference management unit 200.
System further comprises meeting audio mixing processing unit 300, is used to realize the function of audio mixing and distribution, and it can give each participant side with a plurality of users' sound mix together.The number that conference management unit 200 received signal sound detecting units 100 report and the state information of other information and meeting audio mixing processing unit 300 are controlled meeting audio mixing processing unit 300 again.The state information report of meeting audio mixing processing unit 300 is given the processing unit 203 in the conference management unit 200.
Specifically to carry out signal energy computation be to carry out computational process by energy detection unit 101 to signal tone detecting unit 100 among the present invention.
Seeing also Fig. 7, is the structural representation of energy detection unit 101.Energy detection unit 101 comprises first memory cell 1011, second memory cell 1012, the 3rd memory cell 1013 and computing unit 1014.Energy detection unit 101 can adopt the method signal calculated energy that iterates, when utilizing this method, and first memory cell 1011, the time span that is used to store last computation is the signal energy value of T; Second memory cell 1012 is used to store the signal energy value that current time length is T0; Computing unit 1014, the time span of the last computation that the signal energy value that is used for current time length with the storage of second memory cell 1012 and is T0 and first memory cell 1011 are stored is that the difference of the signal energy value of T multiply by less than behind 1 the coefficient, with the time span of the last computation of first memory cell 1011 storage be the signal energy value addition of T, obtaining current time length is the signal energy value of T; The 3rd memory cell 1013 is used to store the described current time length that obtains the signal energy value that is T.The specific implementation method is as follows: EnyT (n)=EnyT (n-1)+[EnyT0 (n)-EnyT (n-1)] * deta.
Wherein EnyT (n) is the n moment, and duration is the short-time average energy of the signal of T; EnyT (n-1) expression n-1 duration constantly is the short-time average energy of the signal of T; EnyT0 (n) is the n moment, and duration is the short-time average energy of the signal of T0; T0＜T wherein, the value of T0 and T can be selected as required; Deta＜1.
Need to prove that energy detection unit 101 also can adopt the sliding window mode to carry out signal energy computation.When utilizing this method, first memory cell 1011 is used for storing the total signal energy value of time-delay buffering area and the buffering area time span the earliest of delaying time is the signal energy value of T0; Second memory cell 1012 is used to store the signal energy value that current time length is T0; Computing unit 1014, the current time length that is used for 1012 storages of second memory cell is the signal energy value of T0 and the total signal energy value addition of the time-delay buffering area that first memory cell 1011 is stored, the time span that deducts again in the time-delay buffering area of first memory cell 1011 storage the earliest is the signal energy value of T0, obtains the current demand signal energy value; The 3rd memory cell 1013 is used to store the described current demand signal energy value that obtains.
When utilizing conference system provided by the invention to carry out videoconference, the participant square tube is crossed the mode of dialing, is linked into conference system through switch, connects; The speech of participant side or the signal of button generally are dual tone multi-frequency dtmf (Dual-Tone Multifrequency) signals at this moment, can be input to meeting audio mixing processing unit 300, also are input to signal tone detecting unit 100 simultaneously; The signal that energy detection unit 101 in the signal tone detecting unit 100 detects the input of participant side carries out signal energy computation, analysis and processing unit 102 analyze participant side by be what number, and recorder time stamp, report the signal energy of number, number and receive time stamp to conference management unit 200 then, the echo number is judged according to signal energy difference and receiving number time difference in conference management unit 200, and it is abandoned.
Before conference management unit 200 judges whether number is echo number-receiving, preestablish the second threshold value E1 of first threshold T 1 and the signal energy of a time, the T1 time collect the digits for the circuit maximum delay adds the algorithm time and, the value of E1 can be determined according to device parameter, 2/4 line reset coil in user's plate of regular phone machine, a definite echo attenutation coefficient is arranged, can determine the value of E1 according to this coefficient, the echo attenutation of the user's plate that for example has is 13dB.The judgement formation that collects the digits is also set up for each meeting-place in conference management unit 200, be used to store the number structure that reports, this structure comprises number, number energy, time stamp, channel number, collects the digits to judge the number structure that formation adopts the storage mode storage of first in first out to report.
When the information such as number that signal tone detecting unit 100 reports are received in conference management unit 200, judging unit 204 wherein judges that whether the time difference of current time of receiving number and last time receiving number is greater than T1, judge number in the formation if then fall collecting the digits of its meeting-place, place clearly by processing unit 203 greater than T1, the number of newly receiving is pressed in the judgement formation that collects the digits, acknowledges receipt of number; If less than T1, judge then whether the number in the current judgement formation that collects the digits of receiving number and meeting-place, place has identical number.Judge in the formation do not have number identical if collect the digits, then the number of newly receiving is pressed into to collect the digits and judges in the formation, acknowledge receipt of number by processing unit 203 with the current number of receiving; If duplicate numbers arranged, further judge that by energy comparing unit 201 whether energy difference between the signal energy of the collect the digits signal energy of judging duplicate numbers in the formation and the current number of receiving is greater than the second threshold value E1.If between the two energy difference is less than the second threshold value E1, then collect the digits and judge the part of duplicate numbers last time in the formation by processing unit 203 deletions, the number of newly receiving is pressed in the judgement formation that collects the digits, acknowledge receipt of number; If between the two energy difference is greater than the second threshold value E1, further judges and currently receive that whether the time difference of receiving number and last time duplicate numbers is greater than T1 by time comparing unit 202.If both time difference is greater than T1, then collect the digits and judge the part of duplicate numbers last time in the formation by processing unit 203 deletions, the number of newly receiving is pressed in the judgement formation that collects the digits, acknowledge receipt of number; If both time differences, then processing unit 203 thought that this number is an echo number-receiving, abandons this number, and process ends less than T1.
More than method and a kind of conference system of a kind of eliminate echo number-receiving provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1, a kind of method of eliminate echo number-receiving is characterized in that:
The numerical signal that receives is carried out energy calculate, obtain signal energy;
Analyze number and recorder time according to the numerical signal that receives;
Relatively this receiving number and last time receiving number signal energy and time of reception, if the signal energy difference between them is greater than being provided with threshold value, and the time of reception difference is confirmed that then this receiving number is an echo number-receiving, and is abandoned this number less than duration is set.
2, the method for eliminate echo number-receiving according to claim 1 is characterized in that, described signal energy computation is:
Current time length is that time span that the signal energy value of T equals signal energy value that current time length is T0 and last computation is that the difference of the signal energy value of T multiply by less than behind 1 the coefficient, with the time span of last computation be T the addition of signal energy value and, described T0 is less than T.
3, the method for eliminate echo number-receiving according to claim 1 is characterized in that, described signal energy computation is:
The current demand signal energy value equal current time length be T0 signal energy value and time-delay buffering area the total signal energy value and, deduct again that the earliest time span is the signal energy value of T0 in the time-delay buffering area.
4, according to the method for each described eliminate echo number-receiving of claim 1 to 3, it is characterized in that:
Described more specific for relatively receiving this receiving number and last time and the signal energy and the time of reception of the number identical with this receiving number.
5, the method for eliminate echo number-receiving according to claim 4 is characterized in that, described relatively taking a step forward comprises:
Judge this receiving number and last time receiving number the time of reception difference whether less than duration is set, if enter described comparison procedure.
6, a kind of conference system is characterized in that, comprising:
Energy detection unit, analysis and processing unit, energy comparing unit, time comparing unit and processing unit;
Energy detection unit is used for that the numerical signal that receives is carried out energy and calculates, and obtains signal energy;
Analysis and processing unit is used for analyzing number according to the numerical signal of described reception, and the recorder time, and described number and time of reception thereof are reported the time comparing unit, and described number and signal energy thereof are reported the energy comparing unit;
The energy comparing unit is used for that this receiving number of comparison and last time receive and the signal energy of the number identical with this receiving number;
The time comparing unit is used for that this receiving number of comparison and last time receive and the time of reception of the number identical with this receiving number;
Processing unit, be used for comparing the signal energy difference of described number greater than threshold value is set at the energy comparing unit, and the time comparing unit compares the time of reception difference of described number and confirm that this receiving number is an echo number-receiving after duration is set, and abandons this number.
7, conference system according to claim 6 is characterized in that:
Described energy detection unit comprises first memory cell, second memory cell, the 3rd memory cell and computing unit;
First memory cell, the time span that is used to store last computation is the signal energy value of T;
Second memory cell is used to store the signal energy value that current time length is T0;
Computing unit, the time span that is used for current time length with second cell stores and is the last computation of the signal energy value of T0 and first cell stores is that the difference of the signal energy value of T multiply by less than behind 1 the coefficient, with the time span of the last computation of first cell stores be the signal energy value addition of T, obtaining current time length is the signal energy value of T;
The 3rd memory cell is used to store the described current time length that obtains the signal energy value that is T.
8, conference system according to claim 6 is characterized in that:
Described energy detection unit comprises first memory cell, second memory cell, the 3rd memory cell and computing unit;
First memory cell is used for storing the total signal energy value of time-delay buffering area and the buffering area time span the earliest of delaying time is the signal energy value of T0;
Second memory cell is used to store the signal energy value that current time length is T0;
Computing unit, be used for current time length with second cell stores and be the total signal energy value addition of the time-delay buffering area of the signal energy value of T0 and first cell stores, the time span that deducts again in the time-delay buffering area of first cell stores the earliest is the signal energy value of T0, obtains the current demand signal energy value;
The 3rd memory cell is used to store the described current demand signal energy value that obtains.
9, according to each described conference system of claim 6 to 8, it is characterized in that,
Further comprise judging unit, be used to judge this receiving number and last time receiving number the time of reception difference whether less than duration is set, if, again by energy comparing unit and time comparing unit relatively this receiving number received with last time and the signal energy and the time of reception of the number identical with this receiving number.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783841A (en) * | 2009-01-15 | 2010-07-21 | 华为终端有限公司 | Method, control equipment and system for lowering acoustic feedback |
| CN108551534A (en) * | 2018-03-13 | 2018-09-18 | 维沃移动通信有限公司 | The method and device of multiple terminals voice communication |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783841A (en) * | 2009-01-15 | 2010-07-21 | 华为终端有限公司 | Method, control equipment and system for lowering acoustic feedback |
| CN108551534A (en) * | 2018-03-13 | 2018-09-18 | 维沃移动通信有限公司 | The method and device of multiple terminals voice communication |
| CN108551534B (en) * | 2018-03-13 | 2020-02-11 | 维沃移动通信有限公司 | Method and device for multi-terminal voice call |
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| CN100563288C (en) | 2009-11-25 |
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