WO2018184220A1 - 一种用于会议讨论系统冗余设计的音频同步系统 - Google Patents

一种用于会议讨论系统冗余设计的音频同步系统 Download PDF

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WO2018184220A1
WO2018184220A1 PCT/CN2017/079766 CN2017079766W WO2018184220A1 WO 2018184220 A1 WO2018184220 A1 WO 2018184220A1 CN 2017079766 W CN2017079766 W CN 2017079766W WO 2018184220 A1 WO2018184220 A1 WO 2018184220A1
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module
audio
signal
conference
synchronization
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PCT/CN2017/079766
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English (en)
French (fr)
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张知硕
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深圳市台电实业有限公司
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Priority to CN201780004009.1A priority Critical patent/CN109005679B/zh
Priority to PCT/CN2017/079766 priority patent/WO2018184220A1/zh
Publication of WO2018184220A1 publication Critical patent/WO2018184220A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/14Systems for two-way working
    • H04N7/15Conference systems

Definitions

  • This application belongs to the technical field of audio data processing, and in particular, to an audio synchronization system for redundant design of a conference discussion system.
  • the conference discussion system is a professional audio device used in conference halls. It is a single-channel sound system that can be used by conference delegates and chairpersons to decentralize or centrally control the microphones. According to the signal transmission method, it can be divided into daisy chain, star type, Wireless and other types.
  • the daisy chain conference discussion system is composed of a conference system control host and a plurality of conference units. Each conference unit is connected to the conference system control host through a signal cable in a daisy chain (commonly known as hand-in-hand) connection.
  • the microphone of the conference unit commonly known as the microphone
  • This daisy chain conference discussion system is controlled by the conference system control host, and the wiring is simple to install and easy to operate, so it has been widely used.
  • the conference room is required to adopt an audio redundancy design to ensure that the conference is interrupted after one of the conference discussion systems fails.
  • the conference audio redundancy design method uses two independent conference discussion systems. As shown in Figure 1, two independent conference discussion systems include two conference units and two conference system control hosts, two of which are conference units. Both are equipped with their own microphones, and two sets of conference system control hosts share the same sound reinforcement system. This redundant design has the following defects:
  • the phase of the collected audio signals may be different (the defect is provided by the applicant to provide a dual backup conference unit, which has been separately Patent application), and the frequency of the two sets of conference system control host clocks may be different, resulting in different delays in the transmission of audio signals from the microphone to the sound reinforcement system, so that if the conference uses two sets of conference discussion systems during the conference, Sending the line output of the two conference discussion systems to the sound reinforcement system, there may be two audio signals different, resulting in poor sound quality after superimposition; if only one of the conference discussion systems works, when there is a fault, then switch Go to another conference to discuss the system, then after the failure occurs, The conference discussion system needs to be manually manually switched by the conference room staff, and during the handover process, the conference audio has a short pause, which also has an adverse effect on the conference.
  • the purpose of the present application is to provide an audio synchronization system for redundant design of a conference discussion system, which aims to solve the problem that the existing audio signal redundancy design may result in poor audio output or encounter in the conference discussion system. Faulty, manual switching is required, which causes the conference audio to pause during the switching process.
  • an audio synchronization system for redundant design of a conference discussion system comprising: a sound reinforcement system, an audio synchronization chime signal generator, and a plurality of conference discussion systems;
  • the conference system control host and the plurality of conference units are included, and each conference unit in the conference discussion system is connected to the conference system control host through a signal cable in a daisy-chain connection manner, and multiple conference units in different conference discussion systems respectively One-to-one correspondence, and the corresponding conference units share one sound pickup module;
  • the synchronization signal output end of the audio synchronization chirp signal is connected to a synchronization signal input end of a plurality of conference system control hosts, and the audio signal input ends of the plurality of conference system control hosts are respectively connected to respective conference discussion systems.
  • an audio synchronization chirp signal is generated by the audio synchronous chime signal generator, and the audio synchronization chirp signal is sent to the plurality of conference system control hosts, and the plurality of conference system control hosts Separating the audio synchronizing chirp signal into its own audio reference chirp signal, and transmitting the audio reference chirp signal to a plurality of corresponding conference units, so that different conferences in the plurality of conference discussion systems
  • the clock synchronization is maintained between the units to ensure that the audio signals output by the plurality of conference discussion systems to the sound reinforcement system are synchronized.
  • the audio synchronous chime signal generator includes a crystal oscillator, a synchronous chirp signal source module, a synchronization signal generating module, and an output driving module;
  • an output end of the crystal oscillator is connected to an input end of the synchronous chime signal source module, and an output end of the synchronous chirp signal source module is connected to an input end of the synchronization signal generating module, Synchronization letter
  • An output end of the number generating module is connected to an input end of the output driving module, and an output end of the output driving module is connected to the plurality of conference system control hosts as a synchronization signal output end of the audio synchronous chime signal generator Synchronization signal input;
  • the crystal oscillator performs crystal oscillation to generate a main chirp signal, and outputs the main chirp signal to the synchronous chirp signal source module, wherein the synchronous chirp signal source is
  • the main chirp signal is subjected to frequency division processing to obtain a bit synchronization chirp signal and a frame synchronization chirp signal, and the synchronization signal generation module further generates a chirp clock signal according to the bit, the frame synchronization chirp signal, and the main signal.
  • the clock signal generates a serial audio synchronous chirp signal, and outputs the serial audio synchronous chirp signal to the plurality of conference system control hosts via the output drive module.
  • the crystal oscillator adopts an active crystal oscillator.
  • the synchronous chirp signal source module includes a sampling frequency acquisition module, a first clock division circuit module, and a second clock division circuit module;
  • the first input terminal of the first clock dividing circuit module and the second clock dividing circuit module is connected as an input end of the synchronous chirp signal source module to an output end of the crystal oscillator, a second input end of the first frequency dividing circuit is connected to a first output end of the sampling frequency acquiring module, a third input end of the first frequency dividing circuit and a second output end of the sampling frequency acquiring module Connecting, the output end of the first clock dividing circuit is connected as a first output end of the synchronous chirp signal source module to an input end of the synchronization signal generating module; the second clock dividing circuit module The second input end is connected to the first output end of the sampling frequency acquisition module, and the output end of the second clock division frequency circuit is connected to the synchronization as a second output end of the synchronous chirp signal source module An input of the signal generation module;
  • the sampling frequency acquisition module receives the sampling frequency of the audio input data set by the user and the number of bits of the bit stream in each data frame of the audio output data transmission, and outputs the sampling frequency and the audio output data. Transmitting, the number of bits of the bit stream in each data frame is transmitted to the first clock dividing circuit module, and the first clock dividing circuit module transmits each data according to the collecting frequency and the audio output data.
  • the bit number of the bit stream in the frame is subjected to frequency division processing to obtain the bit synchronization chirp signal, and the sampling frequency acquisition module transmits the sampling frequency to the second clock division frequency a circuit module, wherein the second clock division circuit module performs frequency division processing on the main chirp clock signal according to the acquisition frequency to obtain the frame synchronization chirp signal;
  • the synchronization signal output end of the audio synchronous chime signal generator is connected to the synchronization signal input end of the plurality of conference system control hosts through a cable.
  • the conference system control host includes a synchronization signal decoding module, a chirp signal adjustment module, a first audio processing module, a first control module, and a conference unit connection module.
  • an input end of the synchronization signal decoding module is connected as a synchronization signal input end of the conference system control host to a synchronization signal output end of the audio synchronization chirp signal generator, and an output end of the synchronization signal decoding module Connected to the first input end of the chirp signal adjustment module, the output of the chopping signal adjustment module is connected to the chopping signal input end of the first audio processing module, and the audio of the first audio processing module
  • the signal input end is connected to the audio signal output end of the conference unit connection module, and the audio signal output end of the first audio processing module is connected to the audio signal output end of the conference system control host to the audio of the sound reinforcement system a signal input end, the synchronization signal output end of the first audio processing module is connected to the synchronization signal input end of the conference unit connection module, and the control signal input end of the first audio processing module is connected to the first control module a control signal output end
  • the conference unit connection module is connected to the first control module circuit ,
  • the conference unit
  • the synchronization signal decoding module decodes the audio synchronization chirp signal to obtain the main chirp signal, the bit synchronization chirp signal, and The frame synchronizes the chirp signal, and outputs the decoded signal to the chirp signal adjustment module, so that the chirp signal adjustment module uses the decoded audio synchronization chirp signal as its own audio reference chirp signal.
  • the conference system control host further includes a synchronization signal detection module and an internal reference clock module;
  • an input end of the synchronization signal detecting module is connected to a synchronization signal output end of the audio synchronous chime signal generator, and an output end of the synchronization signal detecting module is connected to a control end of the chirp signal adjustment module
  • the output end of the internal reference clock module is connected to the second input end of the chirp signal adjustment module; [0022] wherein the internal reference clock module is configured to generate an internal chime reference signal of the conference system control host, and transmit the internal chime reference signal to the chime signal adjustment module,
  • the synchronization signal detecting module detects whether the conference system control host receives the audio synchronization chirp signal sent by the audio synchronization chime signal generator, and controls the chirp clock signal adjustment module to select the synchronization decoding unit output according to the detection result.
  • the decoded audio sync chirp signal or the internal chime reference signal is output to the first audio processing module as an audio reference chirp signal used by the conference system control host.
  • the internal reference clock module includes an internal crystal oscillator module and an internal chirp signal source module; [0024] an output end of the internal crystal oscillator module is connected to an input end of the internal chirp signal source module, The output end of the internal chime signal source module is connected to the chirp signal adjustment module as an output end of the internal reference cuckoo module;
  • an internal reference main chirp signal is generated by the internal crystal oscillator module, and the internal reference main chirp signal is transmitted to the internal chirp signal source module, and the internal chirp clock source module is
  • the internal reference chirp signal is subjected to frequency division processing to obtain an internal bit synchronous chirp signal and an internal frame synchronization chirp signal, and the internal main chirp signal, the internal bit synchronous chirp signal, and the internal frame synchronization chirp signal are transmitted.
  • the internal chime signal source module includes an internal sampling frequency acquisition module, a third clock division frequency circuit module, and a fourth clock division frequency circuit module;
  • the first input terminal of the third clock dividing circuit module and the fourth clock dividing circuit module is connected as an input end of the internal clock signal source module to an output end of the internal crystal oscillator module,
  • the second input end and the third input end of the third clock dividing circuit are respectively connected to the first output end and the second output end of the internal sampling frequency acquiring module, and the third clock dividing circuit of the third clock dividing circuit
  • the output end is connected to the input end of the chirp clock signal adjustment module as a first output end of the internal chime clock signal source module;
  • the first output end of the acquisition module is connected, and the output end of the fourth clock division circuit is connected to the input end of the internal clock signal adjustment module as a second output end of the internal chime signal source module;
  • the internal sampling frequency acquisition module receives an internal sampling frequency of the audio input data set by the user and an audio output data transmission, a bit number of the bit stream in each data frame, and the internal sampling frequency Rate and audio output data transmission, the number of bits of the bit stream in each data frame is transmitted to the third clock dividing circuit module, and the third clock dividing circuit module is based on the internal collecting frequency and audio output Data transmission ⁇
  • the number of bits of the bit stream in each data frame is frequency-divided to obtain the internal bit synchronization chirp signal
  • the internal sampling frequency acquisition module sets the internal sampling frequency Transmitting to the fourth clock division circuit module, wherein the internal clock synchronization circuit module performs frequency division processing on the internal main chirp signal according to the internal acquisition frequency to obtain the internal frame synchronization clock signal.
  • the sound collection module in the plurality of conference discussion systems includes a microphone and an audio distribution circuit connected to the microphone, and the audio distribution circuit transmits the audio signal picked up by the microphone to the conference discussion system.
  • the conference unit shares a pickup module with the corresponding conference units in different conference discussion systems.
  • the plurality of conference units of the plurality of conference discussion systems include a second audio processing module and a second control module that are electrically connected in sequence;
  • the conference unit of one of the plurality of conference discussion systems integrates a microphone and an audio distribution circuit to form a conference unit with a microphone backup output, and the backup output is connected to another conference discussion system.
  • the audio signal picked up by the microphone is transmitted to the second audio processing module of the conference unit via an audio distribution circuit, and in each conference unit, received by the second control module in the conference unit from the conference system control host Audio reference clock signal, and transmitted to the second audio processing module of the conference unit, the second audio processing module of the conference unit transmits the processed audio data to the conference unit
  • the second control module, the second control module of the conference unit transmits the audio signal to the conference system control host, and the conference system controls the host audio processing and transmits the audio signal to the sound reinforcement system.
  • An audio synchronization system for redundant design of a conference discussion system is provided by the present application,
  • the sync signal generator generates an audio sync chirp signal, and transmits the audio sync chirp signal to each conference discussion system, so that each conference discussion system uses the audio sync chirp signal as its own audio reference chirp signal, thereby
  • the audio chirp signals of multiple conference discussion systems can be synchronized to ensure the consistency of the audio signal delay and phase of multiple conference discussion systems, so that the audio signals outputted by multiple conference discussion systems to the sound reinforcement system are kept synchronized, and the synchronization is improved. After using the conference to discuss the system's audio output during the conference, and after one of the conference discussion systems fails, the rest of the conference discussion system remains in normal operation, without manual intervention, and does not affect the conference. .
  • FIG. 1 is a schematic block diagram of a conference audio redundancy design system provided by the prior art
  • FIG. 2 is a schematic diagram of an audio synchronization system for redundant design of a conference discussion system according to a preferred embodiment of the present application
  • FIG. 3 is a schematic block diagram of an audio synchronous chime signal generator in an audio synchronization system for redundant design of a conference discussion system according to a preferred embodiment of the present application;
  • FIG. 4 is a schematic block diagram of a synchronous chime signal source module in an audio synchronous chirp signal generator in an audio synchronization system for redundant design of a conference discussion system according to a preferred embodiment of the present application;
  • FIG. 5 is a schematic block diagram of a conference system control host in an audio synchronization system for redundant design of a conference discussion system according to a preferred embodiment of the present application;
  • FIG. 6 is a schematic block diagram of a conference system control host in an audio synchronization system for redundant design of a conference discussion system according to another preferred embodiment of the present application;
  • FIG. 7 is a schematic block diagram of an internal reference clock module in an audio synchronization system for redundant design of a conference discussion system according to another preferred embodiment of the present application.
  • FIG. 2 is a schematic block diagram of an audio synchronization system for redundant design of a conference discussion system according to a preferred embodiment of the present application. Only the parts related to the present embodiment are shown for convenience of explanation.
  • an audio synchronization system for redundancy design of a conference discussion system including: a sound reinforcement system 2, an audio synchronization chirp signal generator 1, and a plurality of conference discussion systems.
  • the conference discussion system 3 includes a conference system control host 31 and a plurality of conference units 32. Each conference unit 32 is connected to the conference system control host 3 1 by a signal cable in a daisy chain (commonly known as hand-in-hand) connection manner;
  • the plurality of conference units 32 in the different conference discussion system 3 respectively correspond one-to-one, and the conference units 32 corresponding to each other share a sound collection module 4 (including a microphone 41);
  • the synchronization signal output end of the audio synchronization chirp signal is connected to the synchronization signal input end of the plurality of conference system control hosts 31, and the audio signal input terminals of the plurality of conference system control host 31 are respectively connected to the respective conference discussion.
  • the system 3 is daisy-chained to the audio signal output end of the conference unit 32, and the audio signal output end of the plurality of conference system control host 31 is connected to the audio signal input mountain of the sound reinforcement system 2
  • an audio synchronization chirp signal is generated by the audio synchronous chime signal generator 1, and the audio synchronization chirp signal is sent to the plurality of conference system control hosts 31, the plurality of conference systems
  • the control host 31 respectively sets the audio synchronization chirp signal as its own audio reference chirp signal, and transmits the audio reference chirp signal to each of the corresponding plurality of conference units 32, so that the plurality of conferences are discussed.
  • the chime synchronization is maintained between the different conference units 32 in the system 3 to ensure that the audio signals output by the plurality of conference discussion systems 3 to the sound reinforcement system 2 remain synchronized.
  • the sound pickup module 4 (including a microphone 41) is an accessory for collecting live sound, and includes a microphone and an audio distribution circuit connected to the microphone, and the audio distribution is performed by the audio.
  • the circuit transmits the audio signal picked up by the microphone to the corresponding conference unit in the conference discussion system, and the corresponding conference unit in the different conference discussion system shares a sound pickup module (containing a microphone 41).
  • the mutually corresponding conference units 32 of the two different conference systems 3 share a sound pickup module 4 (containing a microphone 41), so that the conference unit 32 in different conference systems 3 can be avoided.
  • the pickup module 4 (which includes a microphone 41) has a different distance from the speaker's mouth and causes a problem in that the audio signal is transmitted from the sound pickup module 4 (containing a microphone 41) to the sound reinforcement system with different delays and phases.
  • the sound reinforcement system 2 includes a mixing console, a power amplifier and a sound box, and the input end of the sound mixing station is connected to the audio signal of the conference system control host 31 of the plurality of conference systems 3. At the output end, the output of the mixer is connected to the input of the amplifier, and the output of the amplifier is connected to the input of the speaker.
  • the mixing console can be used by the conference organizer to adjust the volume level and the sound mode, including but not limited to stereo, heavy bass, and the like.
  • the plurality of conference discussion systems 3 are simultaneously activated during the conference, because the audio synchronization chirp signal generator 1 can provide audio synchronization for the plurality of conference discussion systems 3.
  • the clock signal is such that the plurality of conference discussion systems 3 use the audio synchronization chirp signal as their own audio reference chirp signal, so that the plurality of conference systems 3 can be kept synchronized, so that multiple conferences can be guaranteed.
  • the audio signal output from the system 3 output to the sound reinforcement system 2 is kept consistent, and the conference audio output effect is improved.
  • FIG. 3 is a schematic block diagram of an audio synchronous chime signal generator 1 in an audio synchronization system for redundant design of a conference discussion system according to a preferred embodiment of the present application.
  • the audio synchronous chime signal generator 1 includes a crystal oscillator 11, a synchronous chime signal source module 12, a synchronization signal generating module 13 and an output driving module 14;
  • an output end of the crystal oscillator 11 is connected to an input end of the synchronous chime signal source module 12, and an output end of the synchronous chirp signal source module 12 is connected to an input of the synchronization signal generating module 13.
  • the output end of the synchronization signal generating module 13 is connected to the input end of the output driving module 14, and the output end of the output driving module 14 is connected as the synchronization signal output end of the audio synchronous chirp signal generator 1.
  • the crystal oscillator 11 performs crystal oscillation to generate a main chirp signal, and outputs the main chirp signal to the synchronous chirp signal source module 12, and the synchronous chirp signal source pair
  • the main chirp signal is subjected to frequency division processing to obtain a bit synchronization chirp signal and a frame synchronization chirp signal, and then the synchronization signal generation module 13 is based on the bit synchronization chirp signal, the frame synchronization chirp signal and the
  • the chirp clock signal generates a serial audio synchronizing chirp signal, and outputs the serial audio synchronizing chirp signal to the plurality of conference system control hosts 31 via the output driving module 14.
  • the crystal oscillator 11 employs an active crystal oscillator. Active crystal does not require the DSP's internal Oscillator, good signal quality, stable, and simple connection, no complicated configuration circuit
  • FIG. 4 shows a schematic block diagram of the synchronous chime signal source module 12.
  • the synchronous chime signal source module 12 includes a sampling frequency acquisition module 121, a first clock division circuit module 12 2, and a second clock division circuit module 123;
  • a first input end of the first clock dividing circuit module 122 and the second clock dividing circuit module 123 as an input end of the synchronous chirp signal source module 12 and the crystal oscillator 11 The output terminal is connected, the second input end of the first frequency dividing circuit unit 122 is connected to the first output end of the sampling frequency acquiring module 121, and the third input end of the first frequency dividing circuit unit 122 is The second output end of the sampling frequency obtaining module 121 is connected, and the output end of the first clock dividing circuit module 122 is connected to the synchronization signal generating module 13 as a first output end of the synchronous chirp signal source module 12
  • the second input end of the second clock dividing circuit module 123 is connected to the first output end of the sampling frequency acquiring module 121, and the output end of the second clock dividing circuit module 123 is used as The second output end of the synchronous chime signal source module 12 is connected to the input end of the synchronization signal generating module 13;
  • the sampling frequency acquisition module 121 receives the sampling frequency of the audio input data set by the user and the number of bits of the bit stream in each data frame of the audio output data transmission, and outputs the sampling frequency and audio.
  • Data transmission, the number of bits of the bit stream in each data frame is transmitted to the first clock division circuit module 1 22, and is transmitted by the first clock division circuit module 122 according to the acquisition frequency and audio output data.
  • the frequency of the bit stream in each data frame is frequency-divided to obtain the bit-synchronized chirp signal, and the sampling frequency acquisition module 121 transmits the sampling frequency to the first
  • the second clock dividing circuit module 123 is configured to divide the main chirp clock signal according to the collecting frequency by the second clock dividing circuit module 123 to obtain the frame synchronization chirp signal.
  • the sampling frequency of the user-set audio input data is 48 KHz, in each data frame.
  • the bit stream has a bit number of 64 bits (32 bits for the left channel and 32 bits for the right channel), then the first clock dividing circuit module inputs the data sampling frequency according to the frame audio and each of the data frames
  • the second clock dividing circuit calculates, according to the sampling frequency and the frequency of the main chirp signal, that the frame synchronization chirp signal needs to be obtained.
  • the clock signal, the bit synchronization chirp signal, and the frame synchronization chirp signal are output to the synchronization signal generation module 13, and the synchronization signal generation module 13 encodes the three signals into a series of audio synchronization clocks.
  • the signal is output to the plurality of conference system control hosts 31 through the output drive module 14.
  • the synchronization signal output end of the audio synchronous chime signal generator 1 is connected to the synchronization signal input end of the plurality of conference system control mainframes 31 via a cable.
  • the audio synchronization chirp signal is transmitted over the cable to a plurality of conference system control hosts 31.
  • FIG. 5 shows a schematic block diagram of the conference system control host 31 in this embodiment.
  • the conference system control host 31 includes a synchronization signal decoding module 311, a chirp signal adjustment module 312, a first audio signal processing unit 313, a first control module 314, and a conference unit connection module 315.
  • the input end of the synchronization signal decoding module 311 is connected to the synchronization signal output end of the audio synchronization chirp signal generator 1 as a synchronization signal input end of the conference system control host 31, and the synchronization signal decoding module
  • the output end of the chord signal adjustment module 312 is connected to the first input end of the chirp signal adjustment module 312, and the output end of the chopping signal adjustment module 312 is connected to the chopping signal input end of the first audio processing module 313.
  • the audio signal input end of the first audio processing module 313 is connected to the audio signal output end of the conference unit connection module 315, and the audio signal output end of the first audio processing module 313 serves as the audio signal of the conference system control host 31.
  • the output end is connected to the audio signal input end of the sound reinforcement system 2, and the synchronization signal output end of the first audio processing module 313 is connected to the synchronization signal input end of the conference unit connection module 315, the first audio.
  • the control signal input end of the processing module 313 is connected to the control signal output end of the first control module 314, and the conference unit connection module 315 Circuit 314 connected to the first control module, the conference unit is connected to module 315 as the conference host control system 31 are daisy chained connection port conference unit and the conference unit 32; [0063] wherein, after receiving the audio synchronization chirp signal, the synchronization signal decoding module 311 decodes the audio synchronization chirp signal to obtain the main chirp signal, the bit synchronization clock Transmitting the signal and the frame synchronization chirp signal, and outputting the decoded signal to the chirp signal adjustment module 312, so that the chirp signal adjustment module 312 uses the decoded audio synchronization chirp signal as its own audio reference
  • the conference system control host 31 in the conference system 3 and the plurality of conference units 32 are connected by a cable.
  • the audio reference chirp signal output by the conference system control host 31 is transmitted to the plurality of conference units 32 via the cable.
  • the plurality of conference units 32 of the plurality of conference discussion systems 3 include a second audio processing module and a second control module that are electrically connected in sequence;
  • the conference unit 32 of one of the plurality of conference discussion systems 3 integrates the microphone 41 and the audio distribution circuit 42 to form a conference unit 32 with a microphone backup output, and the backup output is connected to Other meeting discussion system 3 corresponding to the conference unit 32;
  • the audio signal picked up by the microphone 41 is transmitted to the second audio processing module of the conference unit 32 via the audio distribution circuit 42.
  • the second control module in the conference unit 32 receives the source.
  • the conference system controls the audio reference chime signal of the host 31 and transmits it to the second audio processing module of the conference unit 32, and the second audio processing module of the conference unit 32 transmits the processed audio data.
  • the second control module of the conference unit 32 transmits the audio signal to the conference system control host 31, and the conference system controls the host 31 audio. After processing, it is transmitted to the sound reinforcement system 2.
  • the present embodiment provides a redundant design audio synchronization system for the conference discussion system 3, which generates an audio synchronization chirp signal by using an audio synchronization signal generator, and synchronizes the audio clock.
  • the signals are sent to the respective conference discussion system 3, so that each conference discussion system 3 uses the audio synchronization chirp signal as its own audio reference chirp signal, so that the audio chirp signals of the plurality of conference discussion systems 3 can be synchronized.
  • a plurality of conference discussion system 3 audio signal delay and phase consistency so that the audio signals outputted by the plurality of conference discussion systems 3 to the sound reinforcement system 2 are kept synchronized, and the same is improved.
  • the remaining conference discussion system 3 still maintains normal operation without manual intervention and does not affect the conference.
  • FIG. 6 is a schematic block diagram of a conference system control host 31 in an audio synchronization system for redundant design of a conference discussion system according to another preferred embodiment of the present application. Only the parts related to the present embodiment are shown for convenience of explanation.
  • the conference system control host 31 further includes a synchronization signal detection module 316 and an internal reference clock module 317;
  • the input end of the synchronization signal detecting module 316 is connected to the synchronization signal output end of the audio synchronous chime signal generator 1, and the output end of the synchronization signal detecting module 316 is connected to the chime signal adjustment module.
  • the control end of the internal reference clock module 317 is connected to the second input end of the chirp signal adjustment module 312;
  • the internal reference clock module 317 is configured to generate an internal chime reference signal of the conference system control host 31, and transmit the internal chime reference signal to the chirp signal adjustment module 312.
  • the synchronization signal detecting module 316 detects whether the conference system control host 31 receives the audio synchronization chirp signal sent by the audio synchronization chirp signal generator 1, and controls the chirp signal adjustment module 312 according to the detection result. Selecting the decoded audio sync chirp signal or the internal chime reference signal output by the synchronous decoding unit as an audio reference chirp signal used by the conference system control host 31 to output to the first audio processing module 313 .
  • the synchronization signal detecting module 316 detects that the conference system control host 31 receives the audio synchronization chirp signal sent by the audio synchronization chirp signal generator 1, the control is performed.
  • the chirp signal adjustment module 312 adjusts its own audio reference chirp signal according to the decoded audio synchronization chirp signal of the synchronization signal decoding module 311; conversely, if the audio synchronization chirp is not detected within the preset time interval
  • the signal is then controlled to output the internal reference clock module 317 to generate an internal reference chirp signal as its own audio chime reference signal to the first audio processing module 313.
  • the internal reference clock module 317 includes an internal crystal oscillator module 318 and an internal chime signal source module 319; [0075] an output end of the internal crystal oscillator module 318 is connected to an input end of the internal chime signal source module 319, and an output end of the internal chime signal source module 319 is used as an output of the internal reference clock module 317. The end is connected to the chime signal adjustment module 312;
  • an internal reference main clock signal is generated by the internal crystal oscillator module 318, and the internal reference main chirp signal is transmitted to the internal chirp signal source module 319, and the internal chirp signal source is
  • the module 31 9 divides the internal reference main clock signal to obtain an internal bit synchronization chirp signal and an internal frame synchronization chirp signal, and the internal main chirp signal, the internal bit synchronization chirp signal, and an internal frame.
  • the synchronous chirp signal is transmitted to the chirp signal adjustment module 312.
  • the internal crystal oscillator module 318 employs an active crystal oscillator.
  • the internal chime signal source module 319 includes an internal sampling frequency acquisition module 3191, a third clock division circuit module 3192, and a fourth clock division circuit module 3193;
  • a first input end of the third clock dividing circuit module 3192 and the fourth clock dividing circuit module 3193 as an input end of the internal chirp signal source module 319 and the internal crystal module 318 The output end is connected, and the second input end and the third input end of the third clock dividing circuit module 3192 are respectively connected to the first output end and the second output end of the internal sampling frequency acquiring module 3191, where the An output end of the three-clock dividing circuit module 3192 is connected to an input end of the internal clock signal adjusting module 312 as a first output end of the internal chime signal source module 319; the fourth clock dividing circuit module
  • the second input end of the 3193 is connected to the first output end of the internal sampling frequency acquisition module 3191, and the output end of the fourth clock frequency dividing circuit module 3193 is used as the second output of the internal chirp signal source module 319.
  • the end is connected to the input end of the chime signal adjustment module 312;
  • the internal sampling frequency acquisition module 3191 receives an internal sampling frequency of the audio input data set by the user and an audio output data transmission, a bit number of the bit stream in each data frame, and the internal sampling frequency And the audio output data transmission, the number of bits of the bit stream in each data frame is transmitted to the third clock division circuit module 3192, and the third clock division circuit module 3192 is configured according to the internal acquisition frequency and audio.
  • Outputting the data transmission ⁇ the number of bits of the bit stream in each data frame is subjected to frequency division processing on the internal main clock signal to obtain the internal bit synchronization chirp signal, and the internal sampling frequency acquisition module 3191 will internally
  • the sampling frequency is transmitted to the fourth clock dividing circuit module 3193, and the internal clock dividing circuit module 3193 performs frequency dividing processing on the internal main clock signal according to the internal collecting frequency.
  • the internal frame synchronization chirp signal is obtained.
  • the internal reference clock source unit performs frequency division processing on the internal reference main clock signal to obtain an internal bit synchronization chirp signal and an internal frame synchronization chirp signal.
  • the synchronous chirp signal source module 12 performs frequency division processing on the main chirp clock signal to obtain the bit synchronization chirp signal and the frame synchronization chirp signal. The principle is not described herein.
  • the audio synchronization system for the redundancy design of the conference discussion system provided by the embodiment can also synchronize the audio chirp signals of the plurality of conference discussion systems 3, and ensure multiple conferences. Discussing the consistency of the audio signal delay and phase of the system 3, so that the audio signals outputted by the plurality of conference discussion systems 3 to the sound reinforcement system 2 are kept synchronized, and the audio during the conference using three conference discussion systems is improved.
  • this embodiment is The synchronization signal detection module 316 and the internal reference clock module 31 7 are arranged so that the failure of the audio synchronization chime signal generator 1 can ensure that each conference system control host 31 in the plurality of conference discussion systems 3 can still operate normally. .

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Abstract

一种用于会议讨论系统冗余设计的音频同步系统,包括:扩声系统、音频同步时钟信号发生器以及多个会议讨论系统;会议讨论系统包括会议系统控制主机和多个会议单元,不同会议讨论系统中的多个会议单元分别一一对应,且相互对应的会议单元共用一个拾音模块;音频同步时钟信号的同步信号输出端连接至多个会议系统控制主机的同步信号输入端,多个会议系统控制主机的音频信号输入端分别连接至各自所在会议讨论系统以菊花链式连接的会议单元的音频信号输出端,多个会议系统控制主机的音频信号输出端连接至扩声系统的音频信号输入端,其可以提高在同时使用多个会议讨论系统时的音频输出效果。

Description

说明书 发明名称:一种用于会议讨论系统冗余设计的音频同步系统 技术领域
[0001] 本申请属于音频数据处理技术领域, 尤其涉及一种用于会议讨论系统冗余设计 的音频同步系统。
背景技术
[0002] 会议讨论系统是用于会议厅堂的专业音频设备, 是一种可供会议代表和主席分 散或集中控制传声器的单通路声系统, 根据信号传输方式可分为菊花链式、 星 型式、 无线式等多种类型。 其中, 菊花链式会议讨论系统由会议系统控制主机 和多个会议单元组成, 各会议单元以菊花链 (俗称手拉手) 式连接方式通过一 根信号电缆连接到会议系统控制主机。 当会议单元的传声器 (俗称麦克风) 打 幵吋, 该会议单元麦克风采集到的音频信号将通过会议系统控制主机线路输出 给现场的扬声器进行扩声。 这种菊花链式会议讨论系统由会议系统控制主机统 一控制, 布线安装简单, 操作方便, 因此得到了广泛的应用。
[0003] 在一些重要的场合, 为了避免因为会议设备故障等异常导致会议中断的情况, 要求会议室采用音频冗余设计, 保证在其中一套会议讨论系统出现故障吋, 不 会导致会议中断。 当前, 会议音频冗余设计的方式为采用两套独立的会议讨论 系统, 如图 1所示, 两套独立的会议讨论系统包括两套会议单元和两套会议系统 控制主机, 其中两套会议单元都配置有自己传声器, 两套会议系统控制主机共 用同一扩声系统, 这种冗余设计方案存在有以下缺陷:
[0004] 由于两套会议单元的传声器与发言人的嘴部距离不同, 因此其采集到的音频信 号的相位会存在差异 (该缺陷本申请人提供了一种双备份会议单元来解决, 已 另行申请专利) , 而且, 两套会议系统控制主机吋钟频率可能不同, 导致音频 信号从传声器传输到扩声系统的吋延也不相同, 这样在会议过程中如果同吋使 用两套会议讨论系统, 将两套会议讨论系统的线路输出同吋送到扩声系统, 可 能会存在两路音频信号不同, 导致叠加后音质较差; 若只让其中一套会议讨论 系统工作, 当出现故障吋再切换到另一套会议讨论系统, 那么在故障发生吋, 需要由会议室的工作人员人工手动切换会议讨论系统, 且在切换过程中会导致 会议音频有短暂停顿, 对会议进行也有不良影响。
技术问题
[0005] 本申请的目的在于提供一种用于会议讨论系统冗余设计的音频同步系统, 旨在 解决现有的音频信号冗余设计会导致音频输出效果较差, 或者在会议讨论系统 遇到故障吋, 需要人工切换, 在切换过程中会导致会议音频停顿的问题。
问题的解决方案
技术解决方案
[0006] 本申请是这样实现的, 一种用于会议讨论系统冗余设计的音频同步系统, 包括 : 扩声系统、 音频同步吋钟信号发生器以及多个会议讨论系统; 所述会议讨论 系统包括会议系统控制主机和多个会议单元, 所述会议讨论系统中的各会议单 元以菊花链式连接方式通过一根信号电缆连接到会议系统控制主机, 不同会议 讨论系统中的多个会议单元分别一一对应, 且相互对应的会议单元共用一个拾 音模块;
[0007] 所述音频同步吋钟信号的同步信号输出端连接至多个会议系统控制主机的同步 信号输入端, 所述多个会议系统控制主机的音频信号输入端分别连接至各自所 在会议讨论系统以菊花链式连接的会议单元的音频信号输出端, 所述多个会议 系统控制主机的音频信号输出端连接至所述扩声系统的音频信号输入端;
[0008] 其中, 由所述音频同步吋钟信号发生器产生音频同步吋钟信号, 并将所述音频 同步吋钟信号发送至所述多个会议系统控制主机, 所述多个会议系统控制主机 分别将所述音频同步吋钟信号设置为自身的音频基准吋钟信号, 并将所述音频 基准吋钟信号传送给各自所对应的多个会议单元, 使所述多个会议讨论系统中 不同会议单元之间均保持吋钟同步, 以保证所述多个会议讨论系统输出至所述 扩声系统的音频信号保持同步。
[0009] 进一步的, 所述音频同步吋钟信号发生器包括晶体振荡器、 同步吋钟信号源模 块、 同步信号生成模块以及输出驱动模块;
[0010] 所述晶体振荡器的输出端连接至所述同步吋钟信号源模块的输入端, 所述同步 吋钟信号源模块的输出端连接至所述同步信号生成模块的输入端, 所述同步信 号生成模块的输出端连接至所述输出驱动模块的输入端, 所述输出驱动模块的 输出端作为所述音频同步吋钟信号发生器的同步信号输出端连接至所述多个会 议系统控制主机的同步信号输入端;
[0011] 其中, 由所述晶体振荡器进行晶体振荡产生主吋钟信号, 并将所述主吋钟信号 输出至所述同步吋钟信号源模块, 由所述同步吋钟信号源对所述主吋钟信号进 行分频处理得到位同步吋钟信号和帧同步吋钟信号, 再由所述同步信号生成模 块根据所述位同步吋钟信号、 所述帧同步吋钟信号和所述主吋钟信号生成一路 串行音频同步吋钟信号, 并将所述串行音频同步吋钟信号经由所述输出驱动模 块输出至所述多个会议系统控制主机。
[0012] 进一步的, 所述晶体振荡器采用有源晶振。
[0013] 进一步的, 所述同步吋钟信号源模块包括采样频率获取模块、 第一吋钟分频电 路模块以及第二吋钟分频电路模块;
[0014] 所述第一吋钟分频电路模块和第二吋钟分频电路模块的第一输入端作为所述同 步吋钟信号源模块的输入端与所述晶体振荡器的输出端连接, 所述第一分频电 路的第二输入端与所述采样频率获取模块的第一输出端连接, 所述第一分频电 路的第三输入端与所述采样频率获取模块的第二输出端连接, 所述第一吋钟分 频电路的输出端作为所述同步吋钟信号源模块的第一输出端连接至所述同步信 号生成模块的输入端; 所述第二吋钟分频电路模块的第二输入端与所述采样频 率获取模块的第一输出端连接, 所述第二吋钟分频电路的输出端作为所述同步 吋钟信号源模块的第二输出端连接至所述同步信号生成模块的输入端;
[0015] 其中, 由所述采样频率获取模块接收用户设定的音频输入数据的采样频率和音 频输出数据传输吋每个数据帧中比特流的位数, 并将所述采样频率和音频输出 数据传输吋每个数据帧中比特流的位数传输至所述第一吋钟分频电路模块, 由 所述第一吋钟分频电路模块根据所述采集频率和音频输出数据传输吋每个数据 帧中比特流的位数对所述主吋钟信号进行分频处理得到所述位同步吋钟信号, 同吋所述采样频率获取模块将所述采样频率传输至所述第二吋钟分频电路模块 , 由所述第二吋钟分频电路模块根据所述采集频率对所述主吋钟信号进行分频 处理得到所述帧同步吋钟信号; [0016] 进一步的, 所述音频同步吋钟信号发生器的同步信号输出端通过电缆与所述多 个会议系统控制主机的同步信号输入端连接。
[0017] 所述会议系统控制主机包括同步信号解码模块、 吋钟信号调整模块、 第一音频 处理模块、 第一控制模块、 会议单元连接模块,
[0018] 所述同步信号解码模块的输入端作为所述会议系统控制主机的同步信号输入端 连接至所述音频同步吋钟信号发生器的同步信号输出端, 所述同步信号解码模 块的输出端连接至所述吋钟信号调整模块的第一输入端, 所述吋钟信号调整模 块的输出端连接至所述第一音频处理模块的吋钟信号输入端, 所述第一音频处 理模块的音频信号输入端连接至所述会议单元连接模块的音频信号输出端, 所 述第一音频处理模块的音频信号输出端作为所述会议系统控制主机的音频信号 输出端连接至所述扩声系统的音频信号输入端, 所述第一音频处理模块的同步 信号输出端连接至所述会议单元连接模块的同步信号输入端, 所述第一音频处 理模块的控制信号输入端连接至所述第一控制模块的控制信号输出端, 所述会 议单元连接模块与所述第一控制模块电路连接, 所述会议单元连接模块作为所 述会议系统控制主机与所述会议单元的连接端口以菊花链式连接会议单元;
[0019] 其中, 所述同步信号解码模块在接收到所述音频同步吋钟信号吋, 会对所述音 频同步吋钟信号进行解码得到所述主吋钟信号、 所述位同步吋钟信号以及所述 帧同步吋钟信号, 并将解码后的信号输出至所述吋钟信号调整模块, 使所述吋 钟信号调整模块将解码后的音频同步吋钟信号作为自身的音频基准吋钟信号, 并将所述音频基准吋钟信号通过所述第一音频处理模块和所述会议单元连接模 块传输至所述多个会议单元, 使所述多个会议单元的吋钟信号与所述会议系统 控制主机保持同步。
[0020] 进一步的, 所述会议系统控制主机还包括同步信号检测模块和内部基准吋钟模 块;
[0021] 所述同步信号检测模块的输入端连接至所述音频同步吋钟信号发生器的同步信 号输出端, 所述同步信号检测模块的输出端连接至所述吋钟信号调整模块的控 制端, 所述内部基准吋钟模块的输出端连接至所述吋钟信号调整模块的第二输 入端; [0022] 其中, 所述内部基准吋钟模块用于产生所述会议系统控制主机的内部吋钟基准 信号, 并将所述内部吋钟基准信号传输至所述吋钟信号调整模块, 由所述同步 信号检测模块检测所述会议系统控制主机是否接收到所述音频同步吋钟信号发 生器发送的音频同步吋钟信号, 并根据检测结果控制所述吋钟信号调整模块选 择所述同步解码单元输出的解码后的音频同步吋钟信号或者所述内部吋钟基准 信号作为所述会议系统控制主机所使用的音频基准吋钟信号输出至所述第一音 频处理模块。
[0023] 进一步的, 所述内部基准吋钟模块包括内部晶振模块和内部吋钟信号源模块; [0024] 所述内部晶振模块的输出端与所述内部吋钟信号源模块的输入端连接, 所述内 部吋钟信号源模块的输出端作为所述内部基准吋钟模块的输出端连接至所述吋 钟信号调整模块;
[0025] 其中, 由所述内部晶振模块产生内部基准主吋钟信号, 并将所述内部基准主吋 钟信号传输至所述内部吋钟信号源模块, 由所述内部吋钟信号源模块对所述内 部基准吋钟信号进行分频处理得到内部位同步吋钟信号和内部帧同步吋钟信号 , 并将所述内部主吋钟信号、 内部位同步吋钟信号以及内部帧同步吋钟信号传 输至所述吋钟信号调整模块。
[0026] 进一步的, 所述内部吋钟信号源模块包括内部采样频率获取模块、 第三吋钟分 频电路模块以及第四吋钟分频电路模块;
[0027] 所述第三吋钟分频电路模块和第四吋钟分频电路模块的第一输入端作为所述内 部吋钟信号源模块的输入端与所述内部晶振模块的输出端连接, 所述第三吋钟 分频电路的第二输入端和第三输入端分别与所述内部采样频率获取模块的第一 输出端和第二输出端连接, 所述第三吋钟分频电路的输出端作为所述内部吋钟 信号源模块的第一输出端连接至所述吋钟信号调整模块的输入端; 所述第四吋 钟分频电路模块的第二输入端与所述内部采样频率获取模块的第一输出端连接 , 所述第四吋钟分频电路的输出端作为所述内部吋钟信号源模块的第二输出端 连接至所述吋钟信号调整模块的输入端;
[0028] 其中, 由所述内部采样频率获取模块接收用户设定的音频输入数据的内部采样 频率和音频输出数据传输吋每个数据帧中比特流的位数, 并将所述内部采样频 率和音频输出数据传输吋每个数据帧中比特流的位数传输至所述第三吋钟分频 电路模块, 由所述第三吋钟分频电路模块根据所述内部采集频率和音频输出数 据传输吋每个数据帧中比特流的位数对所述内部主吋钟信号进行分频处理得到 所述内部位同步吋钟信号, 同吋所述内部采样频率获取模块将所述内部采样频 率传输至所述第四吋钟分频电路模块, 由所述第四吋钟分频电路模块根据所述 内部采集频率对所述内部主吋钟信号进行分频处理得到所述内部帧同步吋钟信 号。
[0029] 进一步的, 所述多个会议讨论系统中的拾音模块包括传声器和与所述传声器连 接的音频分配电路, 由所述音频分配电路将传声器拾取的音频信号传输至会议 讨论系统中对应的会议单元, 不同会议讨论系统中相互对应的会议单元共用一 个拾音模块。
[0030] 进一步的, 所述多个会议讨论系统的多个会议单元包括依次电性连接的第二音 频处理模块和第二控制模块;
[0031] 所述多个会议讨论系统中的其中一套会议讨论系统的会议单元将传声器和音频 分配电路集成在内, 形成带有麦克风备份输出的会议单元, 备份输出连接至其 他会议讨论系统对应的会议单元;
[0032] 所述传声器拾取的音频信号经由音频分配电路传输至所述会议单元的第二音频 处理模块, 在各个会议单元中, 由会议单元中的第二控制模块接收来自所述会 议系统控制主机的音频基准吋钟信号, 并传输至所述会议单元的所述第二音频 处理模块, 所述会议单元的所述第二音频处理模块将处理后的音频数据传输至 所述会议单元的所述第二控制模块, 所述会议单元的所述第二控制模块将所述 音频信号传输至所述会议系统控制主机, 由所述会议系统控制主机音频处理后 传输至所述扩声系统。
发明的有益效果
有益效果
[0033] 实施本申请提供的一种用于会议讨论系统冗余设计的音频同步系统具有以下有 益效果:
[0034] 本申请提供的一种用于会议讨论系统冗余设计的音频同步系统, 由于采用音频 同步信号发生器产生音频同步吋钟信号, 并将所述音频同步吋钟信号发送至各 个会议讨论系统, 使各个会议讨论系统将所述音频同步吋钟信号作为自身的音 频基准吋钟信号, 从而可以使多个会议讨论系统的音频吋钟信号保持同步, 保 证了多个会议讨论系统音频信号延吋和相位的一致性, 使得多个会议讨论系统 输出至扩声系统的音频信号保持同步, 提高了在同吋使用多个会议讨论系统吋 会议过程中的音频输出效果, 且在其中一套会议讨论系统出现故障吋, 其余会 议讨论系统仍然保持正常运行状态, 无需人工干预, 不影响会议的进行。
对附图的简要说明
附图说明
[0035] 为了更清楚地说明本申请技术方案, 下面将对实施例描述中所需要使用的附图 作简单地介绍, 显而易见地, 下面描述中的附图是本申请的一些实施例, 对于 本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附 图获得其他的附图。
[0036] 图 1是现有技术提供的会议音频冗余设计系统的示意性框图;
[0037] 图 2是本申请一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同步 系统的示意性;
[0038] 图 3是本申请一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同步 系统中音频同步吋钟信号发生器的示意性框图;
[0039] 图 4是本申请一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同步 系统中音频同步吋钟信号发生器中同步吋钟信号源模块的示意性框图;
[0040] 图 5是本申请一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同步 系统中会议系统控制主机的示意性框图;
[0041] 图 6是本申请另一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同 步系统中会议系统控制主机的示意性框图;
[0042] 图 7是本申请另一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同 步系统中内部基准吋钟模块的示意性框图。
本发明的实施方式 [0043] 为了使本申请的目的、 技术方案及优点更加清楚明白, 以下结合附图及实施例 , 对本申请进行进一步详细说明。 应当理解, 此处所描述的具体实施例仅仅用 以解释本申请, 并不用于限定本申请。
[0044] 图 2是本申请一较佳实施例提供的一种用于会议讨论系统冗余设计的音频同步 系统的示意性框图。 为了便于说明仅仅示出与本实施例相关的部分。
[0045] 参见图 2所示, 本实施例提供的一种用于会议讨论系统冗余设计的音频同步系 统, 包括: 扩声系统 2、 音频同步吋钟信号发生器 1以及多个会议讨论系统 3 ; 所 述会议讨论系统 3包括会议系统控制主机 31和多个会议单元 32, 各会议单元 32以 菊花链 (俗称手拉手) 式连接方式通过一根信号电缆连接到会议系统控制主机 3 1 ; 不同会议讨论系统 3中的多个会议单元 32分别一一对应, 且相互对应的会议 单元 32共用一个拾音模块 4 (内含一个传声器 41) ;
[0046] 所述音频同步吋钟信号的同步信号输出端连接至多个会议系统控制主机 31的同 步信号输入端, 所述多个会议系统控制主机 31的音频信号输入端分别连接至各 自所在会议讨论系统 3以菊花链式连接的会议单元 32的音频信号输出端, 所述多 个会议系统控制主机 31的音频信号输出端连接至所述扩声系统 2的音频信号输入 山
[0047] 其中, 由所述音频同步吋钟信号发生器 1产生音频同步吋钟信号, 并将所述音 频同步吋钟信号发送至所述多个会议系统控制主机 31, 所述多个会议系统控制 主机 31分别将所述音频同步吋钟信号设置为自身的音频基准吋钟信号, 并将所 述音频基准吋钟信号传送给各自所对应的多个会议单元 32, 使所述多个会议讨 论系统 3中不同会议单元 32之间均保持吋钟同步, 以保证所述多个会议讨论系统 3输出至所述扩声系统 2的音频信号保持同步。
[0048] 在本实施例中, 所述拾音模块 4 (内含一个传声器 41) 是一个用来采集现场声 音的配件, 包括传声器和与所述传声器连接的音频分配电路, 由所述音频分配 电路将传声器拾取的音频信号传输至会议讨论系统中对应的会议单元, 不同会 议讨论系统中相互对应的会议单元共用一个拾音模块 (内含一个传声器 41) 。 例如: 图 2中, 两个不同会议系统 3中相互对应的会议单元 32共用一个拾音模块 4 (内含一个传声器 41) , 这样可以避免由于不同会议系统 3中会议单元 32所使用 的拾音模块 4 (内含一个传声器 41) 与发言人嘴部的距离不同而导致音频信号从 拾音模块 4 (内含一个传声器 41) 传输到扩声系统的吋延和相位不同的问题。
[0049] 在本实施例中, 所述扩声系统 2包括调音台、 功放和音箱, 所述调音台的输入 端连接至所述多个会议系统 3的会议系统控制主机 31的音频信号输出端, 调音台 的输出端连接至功放的输入端, 功放的输出端连接至音箱的输入端。 其中, 所 述调音台可以供会议主办方调整音量大小和声音模式, 所述声音模式包括但不 限于立体声、 重低音等。
[0050] 在本实施例中, 所述多个会议讨论系统 3在会议进行过程中同吋幵启, 由于所 述音频同步吋钟信号发生器 1可为多个会议讨论系统 3提供音频同步吋钟信号, 使得所述多个会议讨论系统 3均采用所述音频同步吋钟信号作为自身音频基准吋 钟信号, 从而可以使得所述多个会议系统 3保持吋钟同步, 这样可以保证多个会 议讨论系统 3输出至扩声系统 2的音频信号保持一致, 提高会议音频输出效果。
[0051] 图 3示出了本申请一较佳实施例提供的一种用于会议讨论系统冗余设计的音频 同步系统中音频同步吋钟信号发生器 1的示意性框图。
[0052] 参见图 3所示, 所述音频同步吋钟信号发生器 1包括晶体振荡器 11、 同步吋钟信 号源模块 12、 同步信号生成模块 13以及输出驱动模块 14;
[0053] 所述晶体振荡器 11的输出端连接至所述同步吋钟信号源模块 12的输入端, 所述 同步吋钟信号源模块 12的输出端连接至所述同步信号生成模块 13的输入端, 所 述同步信号生成模块 13的输出端连接至所述输出驱动模块 14的输入端, 所述输 出驱动模块 14的输出端作为所述音频同步吋钟信号发生器 1的同步信号输出端连 接至所述多个会议系统控制主机 31的同步信号输入端;
[0054] 其中, 由所述晶体振荡器 11进行晶体振荡产生主吋钟信号, 并将所述主吋钟信 号输出至所述同步吋钟信号源模块 12, 由所述同步吋钟信号源对所述主吋钟信 号进行分频处理得到位同步吋钟信号和帧同步吋钟信号, 再由所述同步信号生 成模块 13根据所述位同步吋钟信号、 所述帧同步吋钟信号和所述吋钟信号生成 一路串行音频同步吋钟信号, 并将所述串行音频同步吋钟信号经由所述输出驱 动模块 14输出至所述多个会议系统控制主机 31。
[0055] 在本实施例中, 所述晶体振荡器 11采用有源晶振。 有源晶振不需要 DSP的内部 振荡器, 信号质量好, 比较稳定, 而且连接方式简单, 不需要复杂的配置电路
[0056] 进一步的, 图 4示出了同步吋钟信号源模块 12的示意性框图。 参见图 4所示, 所 述同步吋钟信号源模块 12包括采样频率获取模块 121、 第一吋钟分频电路模块 12 2以及第二吋钟分频电路模块 123;
[0057] 所述第一吋钟分频电路模块 122和第二吋钟分频电路模块 123的第一输入端作为 所述同步吋钟信号源模块 12的输入端与所述晶体振荡器 11的输出端连接, 所述 第一分频电路单元 122的第二输入端与所述采样频率获取模块 121的第一输出端 连接, 所述第一分频电路单元 122的第三输入端与所述采样频率获取模块 121的 第二输出端连接, 所述第一吋钟分频电路模块 122的输出端作为所述同步吋钟信 号源模块 12的第一输出端连接至所述同步信号生成模块 13的输入端; 所述第二 吋钟分频电路模块 123的第二输入端与所述采样频率获取模块 121的第一输出端 连接, 所述第二吋钟分频电路模块 123的输出端作为所述同步吋钟信号源模块 12 的第二输出端连接至所述同步信号生成模块 13的输入端;
[0058] 其中, 由所述采样频率获取模块 121接收用户设定的音频输入数据的采样频率 和音频输出数据传输吋每个数据帧中比特流的位数, 并将所述采样频率和音频 输出数据传输吋每个数据帧中比特流的位数传输至所述第一吋钟分频电路模块 1 22, 由所述第一吋钟分频电路模块 122根据所述采集频率和音频输出数据传输吋 每个数据帧中比特流的位数对所述主吋钟信号进行分频处理得到所述位同步吋 钟信号, 同吋所述采样频率获取模块 121将所述采样频率传输至所述第二吋钟分 频电路模块 123, 由所述第二吋钟分频电路模块 123根据所述采集频率对所述主 吋钟信号进行分频处理得到所述帧同步吋钟信号。
[0059] 例如, 在一具体实现示例中, 若晶体振荡器利用 12.288MHz有源晶振产生 12.28 8MHz的主吋钟信号, 用户设定的音频输入数据的采样频率为 48KHz, 每个数据 帧中的比特流的位数为 64位 (左声道 32位, 右声道 32位) , 那么所述第一吋钟 分频电路模块根据所述帧音频输入数据采样频率和所述每个数据帧中比特流的 位数计算所述位同步吋钟信号的频率, 例如: 若所述, 那么所述位同步吋钟信 号的频率 64*48KHz=3.072MHz, 计算得到获取所述位同步吋钟信号需要对所述 主吋钟信号进行分频的倍数 Nl=12.288MHz/3.072MHz=4, 然后再根据 N1值对所 述主吋钟信号进行分频处理得到 3.072MHz的位同步吋钟信号; 同吋, 所述第二 吋钟分频电路在获取到所述主吋钟信号和所述采样频率后, 根据所述采样频率 和所述主吋钟信号的频率计算得到获取所述帧同步吋钟信号需要对所述主吋钟 信号进行分频的倍数 N2=12.288MHz/48KHz=256, 然后再根据 N2值对所述主吋 钟信号进行分频处理得到 48KHz的帧同步吋钟信号; 并将所述主吋钟信号、 所述 位同步吋钟信号以及所述帧同步吋钟信号输出至所述同步信号生成模块 13, 使 所述同步信号生成模块 13将上述三个信号进行编码合成一串音频同步吋钟信号 后通过输出驱动模块 14输出至多个会议系统控制主机 31。
[0060] 进一步的, 在本实施例中, 所述音频同步吋钟信号发生器 1的同步信号输出端 通过电缆与所述多个会议系统控制主机 31的同步信号输入端连接。 所述音频同 步吋钟信号通过所述电缆传输至多个会议系统控制主机 31。
[0061] 进一步的, 图 5示出了本实施例中会议系统控制主机 31的示意性框图。 参见图 5 所示, 所述会议系统控制主机 31包括同步信号解码模块 311、 吋钟信号调整模块 312、 第一音频信号处理单元 313、 第一控制模块 314以及会议单元连接模块 315
[0062] 所述同步信号解码模块 311的输入端作为所述会议系统控制主机 31的同步信号 输入端连接至所述音频同步吋钟信号发生器 1的同步信号输出端, 所述同步信号 解码模块 311的输出端连接至所述吋钟信号调整模块 312的第一输入端, 所述吋 钟信号调整模块 312的输出端连接至所述第一音频处理模块 313的吋钟信号输入 端, 所述第一音频处理模块 313的音频信号输入端连接至所述会议单元连接模块 315的音频信号输出端, 所述第一音频处理模块 313的音频信号输出端作为所述 会议系统控制主机 31的音频信号输出端连接至所述扩声系统 2的音频信号输入端 , 所述第一音频处理模块 313的同步信号输出端连接至所述会议单元连接模块 31 5的同步信号输入端, 所述第一音频处理模块 313的控制信号输入端连接至所述 第一控制模块 314的控制信号输出端, 所述会议单元连接模块 315与所述第一控 制模块 314电路连接, 所述会议单元连接模块 315作为所述会议系统控制主机 31 与所述会议单元 32的连接端口以菊花链式连接会议单元; [0063] 其中, 所述同步信号解码模块 311在接收到所述音频同步吋钟信号吋, 会对所 述音频同步吋钟信号进行解码得到将所述主吋钟信号、 所述位同步吋钟信号以 及所述帧同步吋钟信号, 并将解码后的信号输出至所述吋钟信号调整模块 312, 使所述吋钟信号调整模块 312将解码后的音频同步吋钟信号作为自身的音频基准 吋钟信号, 并将所述音频基准吋钟信号通过所述第一音频处理模块 313和所述会 议单元连接模块 315传输至所述多个会议单元 32, 使所述多个会议单元 32的吋钟 信号与所述会议系统控制主机 31保持同步。
[0064] 进一步的, 在本实施例中, 所述会议系统 3中的所述会议系统控制主机 31与所 述多个会议单元 32之间通过电缆进行连接。 所述会议系统控制主机 31输出的音 频基准吋钟信号通过所述电缆传输至所述多个会议单元 32。
[0065] 进一步的, 所述多个会议讨论系统 3的多个会议单元 32包括依次电性连接的第 二音频处理模块和第二控制模块;
[0066] 所述多个会议讨论系统 3中的其中一套会议讨论系统的会议单元 32将传声器 41 和音频分配电路 42集成在内, 形成带有麦克风备份输出的会议单元 32, 备份输 出连接至其他会议讨论系统 3对应的会议单元 32;
[0067] 所述传声器 41拾取的音频信号经由音频分配电路 42传输至所述会议单元 32的第 二音频处理模块, 在各个会议单元 32中, 由会议单元 32中的第二控制模块接收 来自所述会议系统控制主机 31的音频基准吋钟信号, 并传输至所述会议单元 32 的所述第二音频处理模块, 所述会议单元 32的所述第二音频处理模块将处理后 的音频数据传输至所述会议单元 32的所述第二控制模块, 所述会议单元 32的所 述第二控制模块将所述音频信号传输至所述会议系统控制主机 31, 由所述会议 系统控制主机 31音频处理后传输至所述扩声系统 2。
[0068] 以上可以看出, 本实施例提供的一种用于会议讨论系统 3冗余设计音频同步系 统, 由于采用音频同步信号发生器产生音频同步吋钟信号, 并将所述音频同步 吋钟信号发送至各个会议讨论系统 3, 使各个会议讨论系统 3将所述音频同步吋 钟信号作为自身的音频基准吋钟信号, 从而可以使多个会议讨论系统 3的音频吋 钟信号保持同步, 保证了多个会议讨论系统 3音频信号延吋和相位的一致性, 使 得多个会议讨论系统 3输出至扩声系统 2的音频信号保持同步, 提高了在同吋使 用多个会议讨论系统 3吋会议过程中的音频输出效果, 且在其中一套会议讨论系 统 3出现故障吋, 其余会议讨论系统 3仍然保持正常运行状态, 无需人工干预, 不影响会议的进行。
[0069] 图 6示出了本申请另一较佳实施例提供的一种用于会议讨论系统冗余设计的音 频同步系统中会议系统控制主机 31的示意性框图。 为了便于说明仅仅示出了与 本实施例相关的部分。
[0070] 参见图 6所示, 相对于上一实施例, 在本实施例中, 所述会议系统控制主机 31 还包括同步信号检测模块 316和内部基准吋钟模块 317;
[0071] 所述同步信号检测模块 316的输入端连接至所述音频同步吋钟信号发生器 1的同 步信号输出端, 所述同步信号检测模块 316的输出端连接至所述吋钟信号调整模 块 312的控制端, 所述内部基准吋钟模块 317的输出端连接至所述吋钟信号调整 模块 312的第二输入端;
[0072] 其中, 所述内部基准吋钟模块 317用于产生所述会议系统控制主机 31的内部吋 钟基准信号, 并将所述内部吋钟基准信号传输至所述吋钟信号调整模块 312, 由 所述同步信号检测模块 316检测所述会议系统控制主机 31是否接收到所述音频同 步吋钟信号发生器 1发送的音频同步吋钟信号, 并根据检测结果控制所述吋钟信 号调整模块 312选择所述同步解码单元输出的解码后的音频同步吋钟信号或者所 述内部吋钟基准信号作为所述会议系统控制主机 31所使用的音频基准吋钟信号 输出至所述第一音频处理模块 313。
[0073] 在本实施例中, 若所述同步信号检测模块 316检测到所述会议系统控制主机 31 接收到所述音频同步吋钟信号发生器 1发送的音频同步吋钟信号, 则控制所述吋 钟信号调整模块 312根据所述同步信号解码模块 311解码后的音频同步吋钟信号 来调整自身的音频基准吋钟信号; 相反, 若在预设吋间内未检测到所述音频同 步吋钟信号, 则控制所述吋钟信号调整模块 312将所述内部基准吋钟模块 317产 生内部基准吋钟信号作为自身的音频吋钟基准信号输出至所述第一音频处理模 块 313。
[0074] 进一步的, 参见图 7所示, 所述内部基准吋钟模块 317包括内部晶振模块 318和 内部吋钟信号源模块 319; [0075] 所述内部晶振模块 318的输出端与所述内部吋钟信号源模块 319的输入端连接, 所述内部吋钟信号源模块 319的输出端作为所述内部基准吋钟模块 317的输出端 连接至所述吋钟信号调整模块 312;
[0076] 其中, 由所述内部晶振模块 318产生内部基准主吋钟信号, 并将所述内部基准 主吋钟信号传输至所述内部吋钟信号源模块 319, 由所述内部吋钟信号源模块 31 9对所述内部基准主吋钟信号进行分频处理得到内部位同步吋钟信号和内部帧同 步吋钟信号, 并将所述内部主吋钟信号、 内部位同步吋钟信号以及内部帧同步 吋钟信号传输至所述吋钟信号调整模块 312。 在本实施例中, 所述内部晶振模块 318采用有源晶振。
[0077] 进一步的, 所述内部吋钟信号源模块 319包括内部采样频率获取模块 3191、 第 三吋钟分频电路模块 3192以及第四吋钟分频电路模块 3193;
[0078] 所述第三吋钟分频电路模块 3192和第四吋钟分频电路模块 3193的第一输入端作 为所述内部吋钟信号源模块 319的输入端与所述内部晶振模块 318的输出端连接 , 所述第三吋钟分频电路模块 3192的第二输入端和第三输入端分别与所述内部 采样频率获取模块 3191的第一输出端和第二输出端连接, 所述第三吋钟分频电 路模块 3192的输出端作为所述内部吋钟信号源模块 319的第一输出端连接至所述 吋钟信号调整模块 312的输入端; 所述第四吋钟分频电路模块 3193的第二输入端 与所述内部采样频率获取模块 3191的第一输出端连接, 所述第四吋钟分频电路 模块 3193的输出端作为所述内部吋钟信号源模块 319的第二输出端连接至所述吋 钟信号调整模块 312的输入端;
[0079] 其中, 由所述内部采样频率获取模块 3191接收用户设定的音频输入数据的内部 采样频率和音频输出数据传输吋每个数据帧中比特流的位数, 并将所述内部采 样频率和音频输出数据传输吋每个数据帧中比特流的位数传输至所述第三吋钟 分频电路模块 3192, 由所述第三吋钟分频电路模块 3192根据所述内部采集频率 和音频输出数据传输吋每个数据帧中比特流的位数对所述内部主吋钟信号进行 分频处理得到所述内部位同步吋钟信号, 同吋所述内部采样频率获取模块 3191 将所述内部采样频率传输至所述第四吋钟分频电路模块 3193, 由所述第四吋钟 分频电路模块 3193根据所述内部采集频率对所述内部主吋钟信号进行分频处理 得到所述内部帧同步吋钟信号。
[0080] 需要说明的是, 本实施例中, 所述内部基准吋钟源单元对内部基准主吋钟信号 进行分频处理得到内部位同步吋钟信号和内部帧同步吋钟信号的原理与上一实 施例中同步吋钟信号源模块 12对所述主吋钟信号进行分频处理得到所述位同步 吋钟信号和所述帧同步吋钟信号的原理相似, 因此, 在此不再赘述。
[0081] 此外, 本实施例提供的一种用于会议讨论系统冗余设计的音频同步系统中的其 他单元的结构和工作原理与上一实施例中的完全相同, 因此, 在此不再赘述。
[0082] 因此, 可以看出, 本实施例提供的一种用于会议讨论系统冗余设计的音频同步 系统同样可以使多个会议讨论系统 3的音频吋钟信号保持同步, 保证了多个会议 讨论系统 3音频信号延吋和相位的一致性, 使得多个会议讨论系统 3输出至扩声 系统 2的音频信号保持同步, 提高了在同吋使用多个会议讨论系统 3吋会议过程 中的音频输出效果, 且在其中一套会议讨论系统 3出现故障吋, 其余会议讨论系 统 3仍然保持正常运行状态, 无需人工干预, 不影响会议的进行; 此外, 相对于 上一实施例, 本实施例由于设置由同步信号检测模块 316和内部基准吋钟模块 31 7, 从而可以在音频同步吋钟信号发生器 1发生故障吋, 保证多个会议讨论系统 3 中的各个会议系统控制主机 31仍然能够正常运行。
[0083] 以上所述仅为本申请的较佳实施例而已, 并不用以限制本申请, 凡在本申请的 精神和原则之内所作的任何修改、 等同替换和改进等, 均应包含在本申请的保 护范围之内。

Claims

权利要求书
[权利要求 1] 一种用于会议讨论系统冗余设计的音频同步系统, 其特征在于, 包括
: 扩声系统、 音频同步吋钟信号发生器以及多个会议讨论系统; 所述 会议讨论系统包括会议系统控制主机和多个会议单元, 所述会议讨论 系统中的各会议单元以菊花链式连接方式通过一根信号电缆连接到会 议系统控制主机, 不同会议讨论系统中的多个会议单元分别一一对应 , 且相互对应的会议单元共用一个拾音模块; 所述音频同步吋钟信号 发生器的同步信号输出端连接至多个会议系统控制主机的同步信号输 入端, 所述多个会议系统控制主机的音频信号输入端分别连接至各自 所在会议讨论系统以菊花链式连接的会议单元的音频信号输出端, 所 述多个会议系统控制主机的音频信号输出端连接至所述扩声系统的音 频信号输入端;
其中, 由所述音频同步吋钟信号发生器产生音频同步吋钟信号, 并将 所述音频同步吋钟信号发送至所述多个会议系统控制主机, 所述多个 会议系统控制主机分别将所述音频同步吋钟信号设置为自身的音频基 准吋钟信号, 并将所述音频基准吋钟信号传送给各自所对应的多个会 议单元, 使所述多个会议讨论系统中不同会议单元之间均保持吋钟同 步, 以保证所述多个会议讨论系统输出至所述扩声系统的音频信号保 持同步。
[权利要求 2] 如权利要求 1所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述音频同步吋钟信号发生器包括晶体振荡器、 同步吋钟 信号源模块、 同步信号生成模块以及输出驱动模块;
所述晶体振荡器的输出端连接至所述同步吋钟信号源模块的输入端, 所述同步吋钟信号源模块的输出端连接至所述同步信号生成模块的输 入端, 所述同步信号生成模块的输出端连接至所述输出驱动模块的输 入端, 所述输出驱动模块的输出端作为所述音频同步吋钟信号发生器 的同步信号输出端连接至所述多个会议系统控制主机的同步信号输入 山 其中, 由所述晶体振荡器进行晶体振荡产生主吋钟信号, 并将所述主 吋钟信号输出至所述同步吋钟信号源模块, 由所述同步吋钟信号源对 所述主吋钟信号进行分频处理得到位同步吋钟信号和帧同步吋钟信号
, 再由所述同步信号生成模块根据所述位同步吋钟信号、 所述帧同步 吋钟信号和所述主吋钟信号生成一路串行音频同步吋钟信号, 并将所 述串行音频同步吋钟信号经由所述输出驱动模块输出至所述多个会议 系统控制主机。
[权利要求 3] 如权利要求 2所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述晶体振荡器采用有源晶振。
[权利要求 4] 如权利要求 2所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述同步吋钟信号源模块包括采样频率获取模块、 第一吋 钟分频电路模块以及第二吋钟分频电路模块;
所述第一吋钟分频电路模块和第二吋钟分频电路模块的第一输入端作 为所述同步吋钟信号源模块的输入端与所述晶体振荡器的输出端连接 , 所述第一分频电路单元的第二输入端与所述采样频率获取模块的第 一输出端连接, 所述第一分频电路单元的第三输入端与所述采样频率 获取模块的第二输出端连接, 所述第一吋钟分频电路模块的输出端作 为所述同步吋钟信号源模块的第一输出端连接至所述同步信号生成模 块的输入端; 所述第二吋钟分频电路模块的第二输入端与所述采样频 率获取模块的第一输出端连接, 所述第二吋钟分频电路模块的输出端 作为所述同步吋钟信号源模块的第二输出端连接至所述同步信号生成 模块的输入端;
其中, 由所述采样频率获取模块接收用户设定的音频输入数据的采样 频率和音频输出数据传输吋每个数据帧中比特流的位数, 并将所述采 样频率和音频输出数据传输吋每个数据帧中比特流的位数传输至所述 第一吋钟分频电路模块, 由所述第一吋钟分频电路模块根据所述采集 频率和音频输出数据传输吋每个数据帧中比特流的位数对所述主吋钟 信号进行分频处理得到所述位同步吋钟信号, 同吋所述采样频率获取 模块将所述采样频率传输至所述第二吋钟分频电路模块, 由所述第二 吋钟分频电路模块根据所述采集频率对所述主吋钟信号进行分频处理 得到所述帧同步吋钟信号。
[权利要求 5] 如权利要求 1所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述音频同步吋钟信号发生器的同步信号输出端通过电缆 与所述多个会议系统控制主机的同步信号输入端连接。
[权利要求 6] 如权利要求 1所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述会议系统控制主机包括同步信号解码模块、 吋钟信号 调整模块、 第一音频处理模块、 第一控制模块、 会议单元连接模块; 所述同步信号解码模块的输入端作为所述会议系统控制主机的同步信 号输入端连接至所述音频同步吋钟信号发生器的同步信号输出端, 所 述同步信号解码模块的输出端连接至所述吋钟信号调整模块的第一输 入端, 所述吋钟信号调整模块的输出端连接至所述第一音频处理模块 的吋钟信号输入端, 所述第一音频处理模块的音频信号输入端连接至 所述会议单元连接模块的音频信号输出端, 所述第一音频处理模块的 音频信号输出端作为所述会议系统控制主机的音频信号输出端连接至 所述扩声系统的音频信号输入端, 所述第一音频处理模块的同步信号 输出端连接至所述会议单元连接模块的同步信号输入端, 所述第一音 频处理模块的控制信号输入端连接至所述第一控制模块的控制信号输 出端, 所述会议单元连接模块与所述第一控制模块电路连接, 所述会 议单元连接模块作为所述会议系统控制主机与所述会议单元的连接端 口以菊花链式连接会议单元;
其中, 所述同步信号解码模块在接收到所述音频同步吋钟信号吋, 会 对所述音频同步吋钟信号进行解码得到所述主吋钟信号、 所述位同步 吋钟信号以及所述帧同步吋钟信号, 并将解码后的信号输出至所述吋 钟信号调整模块, 使所述吋钟信号调整模块将解码后的音频同步吋钟 信号作为自身的音频基准吋钟信号, 并将所述音频基准吋钟信号通过 所述第一音频处理模块和所述会议单元连接模块传输至所述多个会议 单元, 使所述多个会议单元的吋钟信号与所述会议系统控制主机保持 同步。
[权利要求 7] 如权利要求 6所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述会议系统控制主机还包括同步信号检测模块和内部基 准吋钟模块;
所述同步信号检测模块的输入端连接至所述音频同步吋钟信号发生器 的同步信号输出端, 所述同步信号检测模块的输出端连接至所述吋钟 信号调整模块的控制端, 所述内部基准吋钟模块的输出端连接至所述 吋钟信号调整模块的第二输入端;
其中, 所述内部基准吋钟模块用于产生所述会议系统控制主机的内部 吋钟基准信号, 并将所述内部吋钟基准信号传输至所述吋钟信号调整 模块, 由所述同步信号检测模块检测所述会议系统控制主机是否接收 到所述音频同步吋钟信号发生器发送的音频同步吋钟信号, 并根据检 测结果控制所述吋钟信号调整模块选择所述同步解码单元输出的解码 后的音频同步吋钟信号或者所述内部吋钟基准信号作为所述会议系统 控制主机所使用的音频基准吋钟信号输出至所述第一音频处理模块。
[权利要求 8] 如权利要求 7所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述内部基准吋钟模块包括内部晶振模块和内部吋钟信号 源模块;
所述内部晶振模块的输出端与所述内部吋钟信号源的输入端连接, 所 述内部吋钟信号源的输出端作为所述内部基准吋钟模块的输出端连接 至所述吋钟信号调整模块;
其中, 由所述内部晶振模块产生内部基准主吋钟信号, 并将所述内部 基准主吋钟信号传输至所述内部吋钟信号源模块, 由所述内部吋钟信 号源模块对所述内部基准主吋钟信号进行分频处理得到内部位同步吋 钟信号和内部帧同步吋钟信号, 并将所述内部主吋钟信号、 内部位同 步吋钟信号以及内部帧同步吋钟信号传输至所述吋钟信号调整模块。
[权利要求 9] 如权利要求 8所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于, 所述内部吋钟信号源模块包括内部采样频率获取模块、 第 三吋钟分频电路模块以及第四吋钟分频电路模块; 所述第三吋钟分频电路模块和第四吋钟分频电路模块的第一输入端作 为所述内部吋钟信号源模块的输入端与所述内部晶振模块的输出端连 接, 所述第三吋钟分频电路的第二输入端和第三输入端分别与所述内 部采样频率获取模块的第一输出端和第二输出端连接, 所述第三吋钟 分频电路的输出端作为所述内部吋钟信号源模块的第一输出端连接至 所述吋钟信号调整模块的输入端; 所述第四吋钟分频电路模块的第二 输入端与所述内部采样频率获取模块的第一输出端连接, 所述第四吋 钟分频电路的输出端作为所述内部吋钟信号源模块的第二输出端连接 至所述吋钟信号调整模块的输入端;
其中, 由所述内部采样频率获取模块接收用户设定的音频输入数据的 内部采样频率和音频输出数据传输吋每个数据帧中比特流的位数, 并 将所述内部采样频率和音频输出数据传输吋每个数据帧中比特流的位 数传输至所述第三吋钟分频电路模块, 由所述第三吋钟分频电路模块 根据所述内部采集频率和音频输出数据传输吋每个数据帧中比特流的 位数对所述内部主吋钟信号进行分频处理得到所述内部位同步吋钟信 号, 同吋所述内部采样频率获取模块将所述内部采样频率传输至所述 第四吋钟分频电路模块, 由所述第四吋钟分频电路模块根据所述内部 采集频率对所述内部主吋钟信号进行分频处理得到所述内部帧同步吋 钟信号。
[权利要求 10] 如权利要求 1-9任一项所述的用于会议讨论系统冗余设计的音频同步 系统, 其特征在于,
所述多个会议讨论系统中的拾音模块包括传声器和与所述传声器连接 的音频分配电路, 由音频分配电路将传声器拾取的音频信号传输至会 议讨论系统中对应的会议单元, 不同会议讨论系统中相互对应的会议 单元共用一个拾音模块。
[权利要求 11] 如权利要求 10所述的用于会议讨论系统冗余设计的音频同步系统, 其 特征在于,
所述多个会议讨论系统的多个会议单元包括依次电性连接的第二音频 处理模块和第二控制模块;
所述多个会议讨论系统中的其中一套会议讨论系统的会议单元将传声 器和音频分配电路集成在内, 形成带有麦克风备份输出的会议单元, 备份输出连接至其他会议讨论系统对应的会议单元;
所述传声器拾取的音频信号经由音频分配电路传输至所述会议单元的 第二音频处理模块, 在各个会议单元中, 由会议单元中的第二控制模 块接收来自所述会议系统控制主机的音频基准吋钟信号, 并传输至所 述会议单元的所述第二音频处理模块, 所述会议单元的所述第二音频 处理模块将处理后的音频数据传输至所述会议单元的所述第二控制模 块, 所述会议单元的所述第二控制模块将所述音频信号传输至所述会 议系统控制主机, 由所述会议系统控制主机音频处理后传输至所述扩 声系统。
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