CN104538039A - Audio conference safe secrecy system and method using echo cancellation function - Google Patents
Audio conference safe secrecy system and method using echo cancellation function Download PDFInfo
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Abstract
The invention discloses an audio conference safe secrecy system and method using an echo cancellation function. The system is composed of a control system and a meeting place system. The control system is composed of a processor, a multi-path headset distributor, a conference system master controller and a multi-path audio power amplifier. The meeting place system is composed of a loudspeaker box, a headset and a microphone. The processor is provided with two sound cards and audio conference safe secrecy software, wherein the first sound card has the echo cancellation function. The software is composed of a noise playing module, an audio processing module and a pure voice output module. The method includes the steps that the audio conference safe secrecy software plays noise and collects and transmits voice with noises to the first sound card for echo cancellation and noise reduction, and the audio processing module removes residual noise of voice signals subjected to echo cancellation and noise reduction. The audio conference safe secrecy system and method resolve the problems that the anti-eavesdrop measure of anti-eavesdrop equipment is simplex, and the spreading range of sound waves is not controllable, and can effectively guarantee that the conference content is not eavesdropped and communication is not affected.
Description
Technical field
The present invention relates to sound signal field, refer in particular under conference scenario, the audio conferencing security system preventing conference content to be ravesdropping.
Background technology
The process that people utilize voice to carry out exchanging is by oral cavity vibration sounding, sound is transmitted by transfer voice channel, if sound is converted into the signal (as: sound is converted into electromagnetic wave signal by radio interception device) of other types by transmission channel, then also the signal after transmission to be changed into sound, finally be received by people's ear.Listener-in then steals conference voice information by setting up new transfer voice channel.Such as laser eavesdropping establishes air exactly, and---------this new transfer voice channel of laser pickoff---vibration analyzer---loudspeaker has stolen the voice messaging at meeting scene to laser to glass.The easiness that transfer voice channel is set up and diversity considerably increase anti-eavesdrop place of working difficulty.Transfer voice channel refers to that all can carry acoustic information and the individuality that can be transmitted or system.Such as air is a kind of transfer voice channel as soniferous medium, then the system that---wire---loudspeaker forms such as by sound transducer is also a kind of transfer voice channel.
Anti-eavesdrop technology is generally set about from two aspects, and one is for interception facility, interception facility was lost efficacy thus reaches the object of anti-eavesdrop.Such as, for the wiretap detection instrument of radio interception, for the signal shielding device that mobile phone is monitored, for the laser eavesdropping interference unit of laser eavesdropping.But these anti-eavesdrop products have a common defect---can only for specifically eavesdropping means, such as, laser eavesdropping interference unit is obviously invalid to radio interception device.When being difficult to prediction the other side and which kind of can using eavesdrop means, the precautionary measures just seem awkward.Be for eavesdropping target---voice on the other hand, due to the spread scope of very difficult control sound wave in space, therefore, cannot definitely prevent acoustic signals from being recorded or eavesdropping.Along with the exposure of " prism door " event, concerning security matters meeting anti-eavesdrop problem more and more comes into one's own, and people are to having more and more urgent demand at the anti-eavesdrop equipment that various eavesdropping environment is effectively worked.
Summary of the invention
The technical problem to be solved in the present invention is: for the eavesdropping means unicity of anti-eavesdrop equipment reply in the market and the uncontrollable sex chromosome mosaicism of Acoustic Wave Propagation scope, a kind of audio conferencing security system and time slot scrambling are proposed, can effectively ensure that conference content is not ravesdropping for any eavesdropping means on the one hand, make participant's normal communication unaffected on the one hand.
For solving the problems of the technologies described above, technical scheme of the present invention is: provide a kind of audio conferencing security system and time slot scrambling, in meeting-place, use audio amplifier to play ground unrest to cover meeting-place voice messaging while participant person's meeting, make listener-in cannot understand the voice intercepted, then microphone is utilized to gather mixing sound (hereinafter referred to as noisy speech) and inputing to computer of ground unrest and voice in meeting-place, use known background noise information to carry out denoising, finally send the voice messaging obtained after process to participant and complete interchange.
Audio conferencing security system is made up of control system and meeting place system two parts.Control system is made up of processor, a M multichannel earphone divider, conference system primary controller, multichannel voice frequency power amplifier, and control system is positioned in rack for simplicity, and controls the switch of each component power for convenience, can adopt power supply sequential device.Meeting place system is made up of C audio amplifier, N number of earphone, N number of microphone.N equals personnel participating in the meeting's number, and C is positive integer.
Power supply sequential device is for controlling the switch of remaining part power supply in control system, can according to by prime equipment to rear class equipment sequence starting power supply one by one, then by the orderly close-down all kinds of consumer of rear class to prime during closedown power supply, effectively manage uniformly and control all kinds of consumer, avoid artificial operation error, consumer can be lowered again in the impact of switching moments to power supply grid simultaneously, avoid induced current to the impact of equipment, ensure that the stable of whole using electricity system.Power supply sequential device requires rated voltage 220V, frequency 50Hz, at least possesses five road three-phase supply jacks.Power supply sequential device external 220V 50Hz AC power, is followed successively by processor in control system, multichannel earphone divider, conference system primary controller, multichannel voice frequency power amplifier powers.The setting of power supply sequential device is more convenient to operate in order to what make audio conferencing security system, the switch of the multichannel earphone divider in rack, conference system primary controller, multichannel voice frequency power amplifier is in opening for a long time, ensures that band sound signal of making an uproar can be play immediately after electric power starting like this.When operator presses power supply sequential device upper electrical switch, each parts in rack just can be in running order.
Processor is a computing machine.Requirement possesses two pieces of sound cards, more than 8G internal memory, more than 3.5G dominant frequency, 4 core processors, installs Windows 7 operating system, Java jdk7 and the safe and secret software of audio conferencing.Processor is the broadcasting of control center of the present invention, control noises, controls the collection of noisy speech, and the denoising carrying out noisy speech strengthens process, controls the output of clean speech.The mainly bugle call card that processor hardware subparticipation signal transacting is mutual and two bugle call cards.One bugle call card adopts (as the sound blaster) sound card with echo cancellation function.One bugle call card is used for noise and plays and noisy speech collection carry out echo cancellation to noisy speech, and its audio input end connects conference system primary controller, and audio output connects multichannel voice frequency power amplifier, FPDP connection cpu data bus; One bugle call card carries out D/A switch to the noise signal from CPU, obtains noised audio simulating signal, gives multichannel voice frequency power amplifier by noised audio simulating signal; Simultaneously a bugle call card carries out analog/digital conversion to the noisy speech audio analog signals from conference system primary controller and obtains Noisy Speech Signal, utilize its echo cancellation function to carry out first time denoising, and the voice signal (relatively pure voice signal) after echo cancellation denoising is delivered to CPU; Two bugle call cards are used for clean speech and export, its audio output connects multichannel earphone divider, FPDP connects cpu data bus, and two bugle call cards carry out digital-to-analog conversion to the clean speech signal transmitted from CPU, give multichannel earphone divider by the clean speech audio analog signals obtained.
Processor inside is provided with the safe and secret software of audio conferencing (being run by CPU), and the safe and secret software of audio conferencing is made up of noise playing module, audio processing modules and clean speech output module.
Noise playing module calls one section and leaves the noise file gathered in advance in processor in, this section of noise is the people's acoustic noise recorded under noisy environment, meet coloured, frequency spectrum dynamic change, talk the features such as phonetic feature is similar to people, voice can be covered in comparatively amount of bass situation.The D/A switch end of noise playing module and a bugle call card, audio processing modules is connected, noise file is read from processor memory space, noise file is cut into o (o is positive integer) part, every part of time span t as far as possible little (t≤0.5 second), when playing the instruction of noise when receiving from keyboard, noise playing module generates random number i (1≤i≤o is positive integer), choose i-th part of noise segments and noise signal delivers to a bugle call card, regenerate random number i after finishing and play i-th section of noise segments, repeat this process until noise playing module receives END instruction from keyboard.Shuffle noise can prevent noise information leakage from making listener-in have an opportunity to restore the voice messaging of participant.
One bugle call card is the sound blaster sound card with echo cancellation function, this sound card carries out first pass denoising to Noisy Speech Signal, namely the echo cancellation function by carrying in sound card removes the background noise in noise, obtain relatively pure voice signal, give audio processing modules by relatively pure voice signal.
Audio processing modules is connected with a bugle call card, and is connected with clean speech output module by the second buffering pipe.Because relatively pure voice signal still has residual noise, therefore, the integration algorithm that audio processing modules adopts OM-LSA and wavelet threshold denoising to combine further is (see Liu Fengzeng, Li Guohui, Li Bo to perm the integration algorithm that disclosed in " speech enhan-cement that OM-LSA and wavelet threshold denoising are combined " shown, OM-LSA and wavelet threshold denoising combine " computer science and exploration " 2011 the 5th) residual noise is processed, obtain clean speech signal, clean speech signal is put in the second buffering pipe and waits for that clean speech signal is taken away by clean speech output module.
Clean speech output module is connected with two bugle call card output terminals, and when there are not the voice do not play in clean speech output module, clean speech output module takes out clean speech signal from the second buffering pipe and delivers to two bugle call card D/A switch ends.
Multichannel earphone divider possesses K headphone outlet, and each headphone outlet is with independently power amplifier and volume adjusting turn-knob.Multichannel earphone divider receives the clean speech audio analog signals after the process transmitted from processor two bugle call card, and clean speech audio analog signals is delivered to each road earphone and be delivered in participant's ear.When participant number is more than K, the output terminal of earphone divider can cascade secondary earpiece divider to expand participant number.The number M of multichannel earphone divider is determined by participant number N, headphone outlet quantity K, K is positive integer, each secondary earpiece divider takies an audio output, K output is additionally provided, so each secondary earpiece divider provides K-1 audio output only, the headphone outlet sum provided is greater than participant number N and can normally holds a meeting.So required earphone divider quantity meets constraint
Conference system primary controller integrated meeting-place voice messaging, the switch of multiple microphone in control system, gathers the noisy speech audio analog signals that microphone transmission enters system.Conference system primary controller is commercially available, is the control center of conventional audio meeting.Conference system primary controller requires support 8 core tone frequency channel wire, and 8 core tone frequency channel wire terminals are T connector, not only can connect conference microphone but also expand another 8 core tone frequency channel wire of connection realization " hand in hand connection "." connect hand in hand " and refer to: microphone head and the tail are connected in series, namely after conference host received by first microphone, draw single line from first microphone and connect second microphone, then draw single line from second microphone and receive the 3rd microphone, connect successively w, w >=N/R, R are the number of the eight core tone frequency channel wire output terminals that conference system primary controller possesses, and R is positive integer.
Multichannel voice frequency power amplifier possesses the function of amplifying sound signal and multiple-channel output, and multichannel voice frequency output port number is no less than the number C of audio amplifier.Noised audio simulating signal, from the noised audio simulating signal of a bugle call card, is carried out amplifying and delivers to the multiple audio amplifiers be connected with the multichannel voice frequency output port of multichannel voice frequency power amplifier by multichannel voice frequency power amplifier accepts.Audio amplifier is connected with multichannel voice frequency power amplifier, plays the meeting-place ground unrest transmitted from multichannel voice frequency power amplifier.Audio amplifier quantity basis meeting-place size determines, if the audio amplifier that peak power output is P effectively can cover the meeting-place of s square area.Audio amplifier number L >=S/s, wherein S is meeting-place area, and s records by experiment.
Voice after the denoising received from multichannel earphone divider, as voice-output device, are passed to participant by earphone.Participant needs everyone to wear a set of headphones, so earphone quantity equals participant number N.Earphone is connected with multichannel earphone divider, and is worn by participant.
Microphone is the collecting device of noisy speech of the present invention, adopts the microphone having and support conference voting function.A microphone is connected with conference system primary controller, and all the other microphones use the T-shaped end tone frequency channel wire of 8 core to be connected in " connecting hand in hand " mode.Each participant uses a microphone, and therefore the number of microphone equals people with a part in a conference's number N.
The method adopting audio conferencing security system of the present invention to carry out maintaining secrecy is:
The first step, powers on to conference system primary controller, multichannel voice frequency power amplifier, multichannel earphone divider, processor in rack, opens control box outer audio amplifier, earphone divider power supply.Conference system primary controller integrated meeting-place voice messaging, the switch of multiple microphone in control system, gathers the noisy speech audio analog signals that microphone transmission enters system.The power of clean speech increases by multichannel voice frequency power amplifier, then is play in the earphone of participant by multichannel earphone divider, and processor brings into operation the safe and secret software of audio conferencing.
Second step, noise signal is passed to a bugle call card, multichannel voice frequency power amplifier, audio amplifier by noise playing module successively, in meeting-place, play noise.Now participant starts meeting, and in meeting-place, voice messaging is lived by noise takeover.One bugle call card obtains Noisy Speech Signal after carrying out analog/digital conversion to the noisy speech audio analog signals from conference system primary controller, and echo cancellation is carried out to it, remove part background noise, and the voice signal (relatively pure voice signal) after echo cancellation denoising is delivered to audio processing modules.
3rd step, audio processing modules utilizes OM-LSA to remove residual noise with the voice enhancement algorithm that wavelet threshold denoising combines to the voice signal (relative pure voice signal) after echo cancellation denoising, obtain clean speech signal, and clean speech signal is delivered to clean speech output module.
4th step, clean speech signal is transferred to two bugle call cards, multichannel earphone divider, earphone by clean speech output module successively, and clean speech is play from earphone, and participant can in the pleasant to the ear information to meeting-place of earphone.
Adopt the present invention can reach following effect:
1, audio conferencing security system of the present invention can for the effective encryption realized meeting room information; protection meeting room information security; the use of interference meeting room interception facility; solve the eavesdropping means unicity of anti-eavesdrop equipment reply in the market and the uncontrollable sex chromosome mosaicism of Acoustic Wave Propagation scope; can effectively ensure that conference content is not ravesdropping for any eavesdropping means, there is universality.
2, audio conferencing security system of the present invention can realize the normal function of meeting room system while anti-eavesdrop---namely ensure the normal information interchange of participant.After microphone in meeting room system receives noisy speech, be transported to main frame, abated the noise by a bugle call card and audio processing modules, after noise reduction process, obtain clean speech signal, this clean speech signal is sent in the earphone entrained by every participant by sound card and earphone divider, ensures that participant can be good at receiving conferencing information and correctly conveys a message simultaneously.
Audio conferencing safety security method of the present invention is by the process of dual denoising, namely first time adopts the echo cancellation function of a bugle call card to carry out first time denoising, remove background noise, then the integration algorithm adopting OM-LSA and wavelet threshold denoising to combine by audio processing modules processes residual noise, can be good at the decrypting process realizing noisy speech, and realize speed, effectively reduce time delay, thus good reduction effect can be reached, ensure the normal reception and registration of the information of meeting room.
Accompanying drawing explanation
Fig. 1 is audio conferencing security system overall construction drawing of the present invention;
Fig. 2 is the safe and secret software architecture diagram of audio conferencing of the present invention;
Fig. 3 is audio conferencing safety security method process flow diagram of the present invention.
Embodiment
Fig. 1 is audio conferencing security system overall construction drawing of the present invention;
Audio conferencing security system is made up of control system and meeting place system two parts.Control system is made up of processor, a M multichannel earphone divider, conference system primary controller, multichannel voice frequency power amplifier, and control system is positioned in rack for simplicity, and controls the switch of each component power for convenience, can adopt power supply sequential device.Meeting place system is made up of C audio amplifier, N number of earphone, N number of microphone.N equals personnel participating in the meeting's number, and C is positive integer.
Power supply sequential device is for controlling the switch of remaining part power supply in control system, and power supply sequential device requires rated voltage 220V, frequency 50Hz, at least possesses five road three-phase supply jacks.Power supply sequential device external 220V 50Hz AC power, is followed successively by processor in control system, multichannel earphone divider, conference system primary controller, multichannel voice frequency power amplifier powers.The setting of power supply sequential device is more convenient to operate in order to what make audio conferencing security system, the switch of the multichannel earphone divider in rack, conference system primary controller, multichannel voice frequency power amplifier is in opening for a long time, ensures that band sound signal of making an uproar can be play after electric power starting more immediately like this.When operator presses power supply sequential device upper electrical switch, each parts in rack just can be in running order.
Processor is a computing machine.Requirement possesses two pieces of sound cards, more than 8G internal memory, more than 3.5G dominant frequency, 4 core processors, installs Windows 7 operating system, Java jdk7 and the safe and secret software of audio conferencing.Processor is the broadcasting of control center of the present invention, control noises, controls the collection of noisy speech, and the denoising carrying out noisy speech strengthens process, controls the output of clean speech.The mainly bugle call card that processor hardware subparticipation signal transacting is mutual and two bugle call cards.One bugle call card adopts (as the sound blaster) sound card with echo cancellation function.One bugle call card is used for noise and plays and noisy speech collection carry out echo cancellation to noisy speech, and its audio input end connects conference system primary controller, and audio output connects multichannel voice frequency power amplifier, FPDP connection cpu data bus; One bugle call card carries out D/A switch to the noise signal from CPU, obtains noised audio simulating signal, gives multichannel voice frequency power amplifier by noised audio simulating signal; Simultaneously a bugle call card carries out analog/digital conversion to the noisy speech audio analog signals from conference system primary controller and obtains Noisy Speech Signal, utilize its echo cancellation function to carry out first time denoising, and the voice signal (relatively pure voice signal) after echo cancellation denoising is delivered to CPU; Two bugle call cards are used for clean speech and export, its audio output connects multichannel earphone divider, FPDP connects cpu data bus, and two bugle call cards carry out digital-to-analog conversion to the clean speech signal transmitted from CPU, give multichannel earphone divider by the clean speech audio analog signals obtained.
Fig. 2 is the safe and secret software architecture diagram of audio conferencing of the present invention;
Processor inside is provided with the safe and secret software of audio conferencing, and the safe and secret software of audio conferencing is made up of noise playing module, audio processing modules and clean speech output module.
Noise playing module calls one section and leaves the noise file gathered in advance in processor in, this section of noise is the people's acoustic noise recorded under noisy environment, meet coloured, frequency spectrum dynamic change, talk the features such as phonetic feature is similar to people, voice can be covered in comparatively amount of bass situation.The D/A switch end of noise playing module and a bugle call card, audio processing modules is connected, noise file is read from processor memory space, noise file is cut into o (o is positive integer) part, every part of time span t as far as possible little (t≤0.5 second), when playing the instruction of noise when receiving from keyboard, noise playing module generates random number i (1≤i≤o is positive integer), choose i-th part of noise segments and noise signal delivers to a bugle call card, regenerate random number i after finishing and play i-th section of noise segments, repeat this process until noise playing module receives END instruction from keyboard.Shuffle noise can prevent noise information leakage from making listener-in have an opportunity to restore the voice messaging of participant.
One bugle call card is the sound blaster sound card with echo cancellation function, this sound card carries out first pass denoising to Noisy Speech Signal, namely the echo cancellation function by carrying in sound card removes the background noise in noise, obtain relatively pure voice signal, give audio processing modules by relatively pure voice signal.
Audio processing modules is connected with a bugle call card, and is connected with clean speech output module by the second buffering pipe.Because relatively pure voice signal still has residual noise, therefore, the integration algorithm that audio processing modules adopts OM-LSA and wavelet threshold denoising to combine further processes residual noise, obtain clean speech signal, clean speech signal is put in the second buffering pipe and waits for that clean speech signal is taken away by clean speech output module.Clean speech output module is connected with two bugle call card output terminals, and when there are not the voice do not play in clean speech output module, clean speech output module takes out clean speech signal from the second buffering pipe and delivers to two bugle call card D/A switch ends.
Fig. 3 is audio conferencing safety security method process flow diagram of the present invention.
The first step, powers on to conference system primary controller, multichannel voice frequency power amplifier, multichannel earphone divider, processor in rack, opens control box outer audio amplifier, earphone divider power supply.Conference system primary controller integrated meeting-place voice messaging, the switch of multiple microphone in control system, gathers the noisy speech audio analog signals that microphone transmission enters system.The power of clean speech increases by multichannel voice frequency power amplifier, then is play in the earphone of participant by multichannel earphone divider, and processor brings into operation the safe and secret software of audio conferencing.
Second step, noise signal is passed to a bugle call card, multichannel voice frequency power amplifier, audio amplifier by noise playing module successively, in meeting-place, play noise.Now participant starts meeting, and in meeting-place, voice messaging is lived by noise takeover.One bugle call card obtains Noisy Speech Signal after carrying out analog/digital conversion to the noisy speech audio analog signals from conference system primary controller, and echo cancellation is carried out to it, remove part background noise, and the voice signal (relatively pure voice signal) after echo cancellation denoising is delivered to audio processing modules.
3rd step, audio processing modules utilizes OM-LSA to remove residual noise with the voice enhancement algorithm that wavelet threshold denoising combines to the voice signal (relative pure voice signal) after echo cancellation denoising, obtain clean speech signal, and clean speech signal is delivered to clean speech output module.
4th step, clean speech signal is transferred to two bugle call cards, multichannel earphone divider, earphone by clean speech output module successively, and clean speech is play from earphone, and participant can in the pleasant to the ear information to meeting-place of earphone.
Claims (7)
1. one kind utilizes the audio conferencing security system of echo cancellation function, it is characterized in that audio conferencing security system is made up of control system and meeting place system two parts, control system is made up of processor, a M multichannel earphone divider, conference system primary controller, multichannel voice frequency power amplifier; Meeting place system is made up of C audio amplifier, N number of earphone, N number of microphone, and N equals personnel participating in the meeting's number, and C is positive integer.
Processor is a computing machine.Requirement possesses two pieces of sound cards and installs the safe and secret software of audio conferencing.Processor is the broadcasting of control noises, controls the collection of noisy speech, and the denoising carrying out noisy speech strengthens process, controls the output of clean speech.The mainly bugle call card that processor hardware subparticipation signal transacting is mutual and two bugle call cards.One bugle call card adopts the sound card with echo cancellation function.One bugle call card is used for noise and plays and noisy speech collection carry out echo cancellation to noisy speech, and its audio input end connects conference system primary controller, and audio output connects multichannel voice frequency power amplifier, FPDP connection cpu data bus; One bugle call card carries out D/A switch to the noise signal from CPU, obtains noised audio simulating signal, gives multichannel voice frequency power amplifier by noised audio simulating signal; Simultaneously a bugle call card carries out analog/digital conversion to the noisy speech audio analog signals from conference system primary controller and obtains Noisy Speech Signal, utilize its echo cancellation function to carry out first time denoising, and the voice signal (relatively pure voice signal) after echo cancellation denoising is delivered to CPU; Two bugle call cards are used for clean speech and export, its audio output connects multichannel earphone divider, FPDP connects cpu data bus, and two bugle call cards carry out digital-to-analog conversion to the clean speech signal transmitted from CPU, give multichannel earphone divider by the clean speech audio analog signals obtained.
The safe and secret software of the audio conferencing that processor is installed is made up of noise playing module, audio processing modules and clean speech output module; The safe and secret software of audio conferencing is run by CPU;
Noise playing module calls one section and to leave in processor the noise file gathered in advance in, and the noise in this section of noise file is the people's acoustic noise recorded under noisy environment, meets coloured, frequency spectrum dynamic change, talks the similar feature of phonetic feature to people; D/A switch end, the audio processing modules of noise playing module and a bugle call card are connected, noise file is read from processor memory space, noise file is cut into o part, every part of time span t≤0.5 second, when playing the instruction of noise when receiving from keyboard, noise playing module generates random number i, choose i-th part of noise segments and noise signal delivers to a bugle call card, regenerate random number i after finishing and play i-th section of noise segments, repeating this process until noise playing module receives END instruction from keyboard; O is positive integer, and 1≤i≤o is positive integer;
One bugle call card is the sound blaster sound card with echo cancellation function, this sound card carries out first pass denoising to Noisy Speech Signal, namely the echo cancellation function by carrying in sound card removes the background noise in noise, obtain relatively pure voice signal, give audio processing modules by relatively pure voice signal.
Audio processing modules is connected with a bugle call card, and is connected with clean speech output module by the second buffering pipe.Because relatively pure voice signal still has residual noise, therefore, the integration algorithm that audio processing modules adopts OM-LSA and wavelet threshold denoising to combine further processes residual noise, obtain clean speech signal, clean speech signal is put in the second buffering pipe and waits for that clean speech signal is taken away by clean speech output module.
Clean speech output module is connected with two bugle call card output terminals, and when there are not the voice do not play in clean speech output module, clean speech output module takes out clean speech signal from the second buffering pipe and delivers to two bugle call card D/A switch ends.
Multichannel earphone divider possesses K headphone outlet, and each headphone outlet is with independently power amplifier and volume adjusting turn-knob, and K is positive integer; Multichannel earphone divider receives the clean speech audio analog signals after the process transmitted from processor two bugle call card, and clean speech audio analog signals is delivered to each road earphone and be delivered in participant's ear;
Conference system primary controller integrated meeting-place voice messaging, the switch of multiple microphone in control system, gathers the noisy speech audio analog signals that microphone transmission enters system.Conference system primary controller requires support 8 core tone frequency channel wire, 8 core tone frequency channel wire terminals are T connector, not only can connect conference microphone but also expand another 8 core tone frequency channel wire of connection realization " hand in hand connection ", " connect hand in hand " and refer to: microphone head and the tail are connected in series, namely after conference host received by first microphone, draw single line from first microphone and connect second microphone, then draw single line from second microphone and receive the 3rd microphone, connect successively w, w >=N/R, R is the number of the eight core tone frequency channel wire output terminals that conference system primary controller possesses, R is positive integer.
Multichannel voice frequency power amplifier possesses the function of amplifying sound signal and multiple-channel output, and multichannel voice frequency output port number is no less than the number C of audio amplifier; Noised audio simulating signal, from the noised audio simulating signal of a bugle call card, is carried out amplifying and delivers to the multiple audio amplifiers be connected with the multichannel voice frequency output port of multichannel voice frequency power amplifier by multichannel voice frequency power amplifier accepts; Audio amplifier is connected with multichannel voice frequency power amplifier, plays the meeting-place ground unrest transmitted from multichannel voice frequency power amplifier; Audio amplifier number L determines according to meeting-place size;
Earphone is as voice-output device, and participant are passed in the voice after the denoising received from multichannel earphone divider, and earphone quantity equals participant number N, and earphone is connected with multichannel earphone divider;
Microphone is the collecting device of noisy speech, adopt the microphone having and support conference voting function, a microphone is connected with conference system primary controller, and all the other microphones use the T-shaped end tone frequency channel wire of 8 core to be connected in " connecting hand in hand " mode, and the number of microphone equals people with a part in a conference's number N.
2. utilize the audio conferencing security system of echo cancellation function as claimed in claim 1, it is characterized in that described control system also comprises power supply sequential device, described control system is positioned in rack.
3. utilize the audio conferencing security system of echo cancellation function as claimed in claim 2, it is characterized in that described power supply sequential device requirement rated voltage 220V, frequency 50Hz, at least possess five road three-phase supply jacks; Power supply sequential device external 220V 50Hz AC power, is followed successively by processor in control system, multichannel earphone divider, conference system primary controller, multichannel voice frequency power amplifier powers.
4. utilize the audio conferencing security system of echo cancellation function as claimed in claim 1, it is characterized in that described processor requirement possesses more than 8G internal memory, more than 3.5G dominant frequency, 4 core processors, Windows 7 operating system, Java jdk7 are installed.
5. utilize the audio conferencing security system of echo cancellation function as claimed in claim 1, it is characterized in that described when participant number is more than K, the output terminal cascade secondary earpiece divider of earphone divider, the number M of multichannel earphone divider is determined by participant number N, headphone outlet quantity K, and earphone divider number M meets
6. utilize the audio conferencing security system of echo cancellation function as claimed in claim 1, if it is characterized in that, peak power output is the meeting-place that the audio amplifier of P effectively can cover s square area, then audio amplifier number L >=S/s, wherein S is meeting-place area, and s records by experiment.
7. utilizing utilizes the audio conferencing security system of echo cancellation function to carry out a method of maintaining secrecy as claimed in claim 1, it is characterized in that comprising the following steps:
The first step, powers on to conference system primary controller, multichannel voice frequency power amplifier, multichannel earphone divider, processor in rack, opens control box outer audio amplifier, earphone divider power supply.Conference system primary controller integrated meeting-place voice messaging, the switch of multiple microphone in control system, gathers the noisy speech audio analog signals that microphone transmission enters system.The power of clean speech increases by multichannel voice frequency power amplifier, then is play in the earphone of participant by multichannel earphone divider, and processor brings into operation the safe and secret software of audio conferencing.
Second step, noise signal is passed to a bugle call card, multichannel voice frequency power amplifier, audio amplifier by noise playing module successively, in meeting-place, play noise.Now participant starts meeting, and in meeting-place, voice messaging is lived by noise takeover.One bugle call card obtains Noisy Speech Signal after carrying out analog/digital conversion to the noisy speech audio analog signals from conference system primary controller, and echo cancellation is carried out to it, remove part background noise, and the voice signal (relatively pure voice signal) after echo cancellation denoising is delivered to audio processing modules.
3rd step, audio processing modules utilizes OM-LSA to remove residual noise with the voice enhancement algorithm that wavelet threshold denoising combines to the voice signal (relative pure voice signal) after echo cancellation denoising, obtain clean speech signal, and clean speech signal is delivered to clean speech output module.
4th step, clean speech signal is transferred to two bugle call cards, multichannel earphone divider, earphone by clean speech output module successively, and clean speech is play from earphone, and participant can in the pleasant to the ear information to meeting-place of earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510006126.4A CN104538039B (en) | 2015-01-07 | 2015-01-07 | Utilize the audio conferencing security system and time slot scrambling of echo cancellation function |
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