CN108449630A - Audio synchronization method and system - Google Patents
Audio synchronization method and system Download PDFInfo
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- CN108449630A CN108449630A CN201810314485.XA CN201810314485A CN108449630A CN 108449630 A CN108449630 A CN 108449630A CN 201810314485 A CN201810314485 A CN 201810314485A CN 108449630 A CN108449630 A CN 108449630A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
- H04N21/43076—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of the same content streams on multiple devices, e.g. when family members are watching the same movie on different devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
- H04N21/43632—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wired protocol, e.g. IEEE 1394
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The present invention discloses a kind of audio synchronization method and system, and steps are as follows for audio synchronization method：Main broadcaster puts device periodically by power carrier signal of the power line output comprising solicited message at least one from playback equipment；By power line receive it is at least one exported from playback equipment include the power carrier signal of response message, and demodulate and obtain the response message, response message carries corresponding solicited message receiving time and response message sending time from playback equipment；According to the transmission of solicited message and response message and receiving time, determine main playback equipment with it is at least one from the one-way delay time of playback equipment and clock offset times；Main playback equipment modulation is exported comprising clock offset times to corresponding from playback equipment, for correcting local zone time according to the clock offset times from playback equipment.Technical solution of the present invention can simplify the line construction of sound system and reliably realize that audio sync plays compared with the existing technology.
Description
Technical field
The present invention relates to sound system technical field, more particularly to a kind of audio synchronization method and system.
Background technology
Sound system refers to the acoustic signals of primary sound field sound being converted to electric signal with microphone, and want by certain
It asks electric signal by handling accordingly, electric signal, which is finally reconverted into acoustic signals, with loud speaker resets, in multichannel sound
Cable structure can effectively be simplified by using the mode of power line carrier in acoustic system, improve audio synchronization system can
By property, playback equipment need to only be connect the broadcasting that audio signal can be realized by extension sound channel with power line.But playing audio
Each playback equipment when signal is because local zone time is different, and there is propagation to prolong between playback equipment and main playback equipment
When, it causes each audio to play asynchronous, declines so as to cause the sound quality of sound system, reduce the reliability of sound system.
Invention content
The main object of the present invention is to provide a kind of audio synchronization method, it is intended to improve the reliability of sound system.
To achieve the above object, audio synchronization method proposed by the present invention is applied to audio synchronization system, the system packet
Include main playback equipment and at least one from playback equipment, the main playback equipment and at least one from passing through electricity between playback equipment
The line of force connects；The audio synchronization method includes：
The main broadcaster puts device periodically and passes through power carrier signal of the power line output comprising solicited message to institute
It states at least one from playback equipment；By the power line receive it is described it is at least one exported from playback equipment comprising response letter
The power carrier signal of breath, and demodulate and obtain the response message, the response message carries corresponding asking from playback equipment
Ask information receiving time and response message sending time；According to the transmission of the solicited message and receiving time and the response
The transmission of information and receiving time determine the main playback equipment and at least one one-way delay time from playback equipment
And clock offset times；The main playback equipment modulation exports the power carrier signal comprising the clock offset times to correspondence
Slave playback equipment, for it is described from playback equipment according to the clock offset times correct local zone time；Main broadcaster's equipment
Audio signal is obtained, determines reproduction time, and according to the reproduction time, playing audio signal.
Preferably, main broadcaster's equipment obtains audio signal, determines that reproduction time includes：It is connect from the power carrier line
Power carrier signal of the packet receiving containing the audio signal；Wherein, reproduction time is carried in the audio signal；Parse the packet
Power carrier signal containing the audio signal obtains audio signal, and determines reproduction time from the audio signal.
Preferably, main broadcaster's equipment obtains audio signal, determines reproduction time, and according to the reproduction time, play
Audio signal includes：The main playback equipment obtains audio signal from external equipment, and according to each from the unidirectional of playback equipment
Delay time determines the reproduction time of audio signal；The main playback equipment is by the power carrier line to described from broadcasting
Equipment sends the audio signal for carrying reproduction time；The main playback equipment plays the audio when reaching reproduction time
Signal.
Preferably, the main broadcaster is put device periodically and is believed by power carrier of the power line output comprising solicited message
It number at least one is specifically included to described from playback equipment：The main broadcaster puts the generation solicited message of device periodically；It will be described
Solicited message is modulated to power carrier signal；The power carrier signal is sent to by power line described at least one from broadcasting
Put equipment, and record the sending time of the power carrier signal, wherein using the sending time of the power carrier signal as
The sending time of the solicited message.
Preferably, it is described by the power line receive it is described it is at least one exported from playback equipment include response message
Power carrier signal, and demodulate and obtain the response message and specifically include：The main playback equipment is connect by the power line
Receive at least one power carrier signal for including response message exported from playback equipment；From described at least one from broadcasting
Demodulation obtains the response message, and the receiving time of recording responses information in the power carrier signal of equipment output.
Preferably, it is described according to the transmission of the solicited message and the transmission of receiving time and response message and reception when
Between, determine the main playback equipment with it is described at least one specific from the one-way delay time of playback equipment and clock offset times
Including：The first deviation time is determined according to the sending time of the solicited message and receiving time；According to the response message
Sending time and receiving time determine the second deviation time；Main broadcaster is determined according to first deviation time and the second deviation time
Put equipment with it is described at least one from the one-way delay time of playback equipment and clock offset times.
The present invention also proposes a kind of audio synchronization method, is applied to audio synchronization system, and the audio synchronization system includes
Main playback equipment and at least one from playback equipment, the main playback equipment and at least one is carried between playback equipment by electric power
Swash connects；The audio synchronization method includes：
It is described from playback equipment by the power line receive by the main broadcaster put that device periodically sends out comprising request
The power carrier signal of information, and corresponding output response message, the response message carry solicited message receiving time and
Response message sending time；It is put by power line power carrier signal of the modulation output comprising response message to the main broadcaster
Equipment, so that the main playback equipment is according to the transmission of the solicited message and the transmission of receiving time and response message and reception
Time determine main playback equipment with from the one-way delay time of playback equipment and clock offset times；It is received by the power line
Including the power carrier signal of the clock offset times and demodulate and obtain the clock offset times, while according to the clock
Shift time corrects local zone time；Audio signal is obtained, determines reproduction time, and the audio is played according to the reproduction time
Signal.
Preferably, the acquisition audio signal determines that reproduction time includes：It receives from power carrier line and believes comprising audio
Number power carrier signal；The power carrier signal is parsed, the audio signal is obtained；It carries and broadcasts in the audio signal
Put the time；The reproduction time is determined in the audio signal.
Preferably, the acquisition audio signal determines that reproduction time includes：Audio signal is obtained from external equipment, and is broadcast
Put the time；After the determining reproduction time, further include：The reproduction time is added to the audio signal, passes through institute
It states power carrier line and is sent to other playback equipments.
Preferably, described that the electric power load comprising solicited message is received periodically through power line demodulation from playback equipment
Wave signal, and corresponding output response message, the response message carries solicited message receiving time and response message is sent
Time specifically includes：Described received from playback equipment by the power line include by what the main broadcaster put that device periodically sends out
The power carrier signal of solicited message；Demodulation obtains solicited message from the power carrier signal that the main playback equipment is sent out,
And record the receiving time of solicited message；Output response message is corresponded to according to solicited message, and when the transmission of recording responses information
Between.
The present invention also proposes a kind of audio synchronization system, including main playback equipment and at least one from playback equipment, described
It main playback equipment and at least one is connected between playback equipment by power line；Wherein,
The main playback equipment is the equipment for the audio synchronization method for executing main playback equipment as described above；It is described from broadcasting
It is to execute as described above from the equipment of the audio synchronization method of playback equipment to put equipment.
Preferably, the main playback equipment includes the first modem, the first controller and the first player；Described
One modem one end connects the power line, and the other end is connect with first controller, first controller also with
The first player connection.
Preferably, it is described from playback equipment include second modem, second controller and the second player；Described
One end of two modems connects the power line, and the other end is connect with the second controller, and the second controller is also
It is connect with second player.
In audio synchronization method of the present invention：First, it includes solicited message that main broadcaster, which puts device periodically by power line output,
And the power carrier signal of power supply signal is at least one from playback equipment；Then, it is received by power line at least one from broadcasting
Put equipment output includes the power carrier signal of response message, and demodulates acquisition response message, and response message carries corresponding
From the solicited message receiving time and response message sending time of playback equipment；Then, according to solicited message and response message
Transmission and receiving time, determine main playback equipment with it is at least one from the one-way delay time of playback equipment and clock skew when
Between；Then, power carrier signal of the main playback equipment modulation output comprising clock offset times be to corresponding from playback equipment, with
For correcting local zone time from playback equipment according to clock offset times；Finally, audio signal to be played is exported by power line
To corresponding from playback equipment, and the audio signal is played after postponing the one-way delay time, with described from playback equipment
The audio signal is played simultaneously.
The technical program send and receive according to power line solicited message and response message determine master and slave playback equipment it
Between the one-way delay time and clock offset times, from playback equipment according to clock offset times adjust local zone time, to reach
To with main playback equipment time consistency, and pass through power line carry out signal transmission, simplied system structure, when play audio letter
Number when, main playback equipment playing audio signal after the one-way delay time, from playback equipment according to clock offset times revised version
Playing audio signal after the ground time, to realize that the audio sync of master and slave playback equipment plays, that improves synchronous sound system can
By property.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is sound equipment synchronous system architecture schematic diagram；
Fig. 2 is the flow diagram of audio synchronization method first embodiment of the present invention；
Fig. 3 is the reproduction time schematic diagram of the master and slave playback equipment of audio synchronization method of the present invention；
Fig. 4 is the refinement flow diagram of step S110 in Fig. 2；
Fig. 5 is the refinement flow diagram of step S120 in Fig. 2；
Fig. 6 is the refinement flow diagram of step S130 in Fig. 2；
Fig. 7 is the flow diagram of another embodiment of audio synchronization method of the present invention；
Fig. 8 is the refined flow chart of step S210 in Fig. 7；
Fig. 9 is the structural schematic diagram of audio synchronization system of the present invention；
Figure 10 is that the main broadcaster of audio synchronization system of the present invention puts device structure schematic diagram；
Figure 11 is the slave playback equipment structural schematic diagram of audio synchronization system of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot understand
To indicate or implying its relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the technical side between each embodiment
Case can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical solution
Conflicting or cannot achieve when occur will be understood that the combination of this technical solution is not present, also not the present invention claims guarantor
Within the scope of shield.
The present invention proposes a kind of audio synchronization method, is applied to audio synchronization system, audio synchronization system includes that main broadcaster is put
Equipment and at least one from playback equipment, main playback equipment and at least one is connected between playback equipment by power line.
It should be noted that playback equipment can be with to audio conversion devices send audio signal function have send out
Equipment of acoustic device, such as active audio amplifier, passive loudspeaker box, loud speaker or loudspeaker etc., do not limit herein.It is main in the present embodiment
It playback equipment and can be directly connected to from playback equipment with power line, socket or other connectors can also be passed through and connected with power line
It connects, facilitates installing and dismounting, can be one from playback equipment, or it is multiple, it is selected according to actual installation scene, this
Invention carries out the transmission of audio signal by way of power line carrier, can effectively reduce the quantity of audio transmission cable,
Improve the reliability of audio synchronization system, and when needing to extend sound channel, need to only need it is to be mounted from playback equipment and
Power line connects the extension that sound channel can be realized.
It is understood that being based on above-mentioned audio synchronization system, audio synchronization method proposed by the present invention may be implemented to lead
Playback equipment and multiple purposes being played simultaneously from playback equipment are below realized audio synchronization method proposed by the present invention aforementioned
The multiple embodiments of purpose are illustrated respectively.
With reference to shown in Fig. 2, audio synchronization method first embodiment of the present invention, in this first embodiment, this hair are shown
The audio synchronization method of bright proposition includes：
Step S110, the described main broadcaster puts device periodically and exports the power carrier for including solicited message by the power line
Signal is to described at least one from playback equipment.
Specifically, in order to which solicited message can be transmitted from power line, it will request after main playback equipment output solicited message
Information, which is modulated, is converted to power carrier signal, and power carrier signal is transmitted in power line, will pass through power line
It is transferred to respectively from playback equipment, when respectively receiving power carrier signal from power line from playback equipment, then by the electric power of reception
Carrier signal demodulation is converted to solicited message.Main playback equipment records the practical hair of solicited message when sending solicited message simultaneously
The time T1 sent carries time T1 extremely from playback equipment simultaneously when request message is sent.
It should be noted that the time interval that main broadcaster puts device periodically transmission solicited message can be true according to experiment parameter
Fixed suitable value, such as 1 to 2 second, then communication load is heavier when too short to avoid time interval, and avoids interval time long same
The precision of step is relatively low.
Step S120, at least one power carrier for including response message exported from playback equipment is received by power line
Signal, and demodulate acquisition response message.
Wherein, response message carries corresponding when being sent from the solicited message receiving time and response message of playback equipment
Between.
Specifically, receive power carrier signal by power line from playback equipment and demodulate solicited message, while from broadcasting
The time T2 that equipment record solicited message receives is put, corresponding response message is exported later and records the time for sending out response message
T3, the response message exported from playback equipment are equally modulated, and are modulated to power carrier signal, and power carrier is believed
It number is transmitted in power line, main playback equipment receives power carrier signal by power line and demodulates reception response message, and remembers
Record the receiving time T4 of response message.
Step S130, it according to the transmission of solicited message and the transmission of receiving time and response message and receiving time, determines
Main playback equipment with it is at least one from the one-way delay time of playback equipment and clock offset times.
Specifically, the time that time and response message that main playback equipment is sent according to solicited message return calculates message back
Total delay is returned, according to network symmetry, the transmission delay of both direction is identical, then the round-trip half being always delayed is exactly unidirectionally to prolong
When, as shown in figure 3, master and slave playback equipment local zone time because of clock speed due to there is clock jitter in itself, because
This, the first deviation time Tms1 of solicited message receiving time T2 and solicited message sending time T1 be equal to the one-way delay time with
The sum of clock offset times, i.e.,：
Tms1=T2-T1=Tdey+ΔT
TdeyFor signal propagation delay time, that is, one-way delay time, Δ T, which is that master and slave playback equipment local zone time is practical, to be deposited
Clock jitter, represent and still lag behind the local zone time of main playback equipment in advance from playback equipment local zone time, when Δ T is
Timing indicates the local zone time that main playback equipment is ahead of from playback equipment local zone time, when Δ T is negative, indicates from broadcasting
Equipment local zone time lags behind the local zone time of main playback equipment, when Δ T is zero, indicate main playback equipment with from playback equipment
Local zone time is identical, and Δ T is defined as clock offset times, as can be seen from FIG. 3, response message receiving time T4 and sending time
The second deviation time Tms2 of T3 is equal to the difference of one-way delay time and clock jitter time, i.e.,：
Tms2=T4-T3=Tdey-ΔT
It can then be obtained according to above-mentioned calculation formula：
To according to solicited message send and receive time and response message send and receive the time determine each master,
Clock offset times from playback equipment and one-way delay time.
Step S140, main playback equipment power carrier signal of the modulation output comprising clock offset times to it is corresponding from
Playback equipment, for correcting local zone time according to the clock offset times from playback equipment.
Specifically, main playback equipment by clock offset times be modulated to power carrier signal and by power line be output to from
Playback equipment demodulates clock offset times, from playback equipment according to clock skew from playback equipment from power carrier signal
Time is modified local zone time, from the revised local zone time of playback equipment and main playback equipment when postponing one-way delay
Between after time consistency.As shown in figure 3, for example when main playback equipment sends out solicited message in T1 equal to 101 moment, set from broadcasting
It is standby to be equal to 106 reception solicited messages in T2, then according to Tms1=T2-T1=Tdey+ Δ T is it is found that Tms1 is equal to 5, from playback equipment
Response message is sent out equal to 111 moment in T3, main playback equipment is in 108 reception response messages, then according to Tms2=T4-T3
=TdeyΔ T is it is found that Tms2 is equal to -3, thus, it can be known that TdeyEqual to 1, Δ T is equal to 4.Further, main playback equipment is in T1
Quarter will be sent to from the clock offset times of playback equipment from playback equipment.It is then inclined to clock in T2 receptions from playback equipment
Local zone time is corrected after shift time, i.e., revised time T2=(106-4)=102, main playback equipment is through delay time TdeyProlong
When after time T1=101+1=102, therefore, master and slave playback equipment realize clock synchronization.
Step S150, main broadcaster's equipment obtains audio signal, determines reproduction time, and according to reproduction time, play audio letter
Number.
Wherein, main playback equipment can obtain audio signal from other playback equipments, can also be obtained from external equipment
Take audio signal.
Specifically, when other playback equipments transmit audio signal to main playback equipment, at this point, main broadcaster's equipment obtains audio
Signal determines that reproduction time includes：The power carrier signal for including audio signal is received from power carrier line.Parsing includes sound
The power carrier signal of frequency signal obtains audio signal, and determines reproduction time from audio signal.Wherein, in audio signal
Carry reproduction time.
That is, main playback equipment after receiving the power carrier signal comprising audio signal in power carrier line, solves
This power carrier signal is adjusted, to obtain audio signal, reproduction time is carried in audio signal, audio signal can be parsed,
Obtain reproduction time.After reaching reproduction time, playing audio signal.
When main playback equipment obtains audio signal from external equipment, main playback equipment also needs the audio signal that will be obtained to send out
It send to other from playback equipment, the audio signal of main broadcaster's equipment acquisition at this time determines reproduction time, and according to reproduction time, plays
Audio signal includes：Main playback equipment obtains audio signal from external equipment, and according to each one-way delay time from equipment,
Determine the reproduction time of audio signal.Main playback equipment carries reproduction time by power carrier line to from playback equipment transmission
Audio signal.Main playback equipment is when reaching reproduction time, playing audio signal.
That is, main playback equipment gets audio signal to be played from external equipment.It is not given in external equipment
When going out reproduction time, main broadcaster's equipment can be true by reproduction time according to determining each one-way delay time from playback equipment
It is set to more than the maximum one-way delay time, and the reproduction time determined is added to audio signal, main playback equipment is by this sound
Frequency signal modulation is power carrier signal, and is transmitted to other from playback equipment by power carrier line, so that other are from broadcasting
Equipment gets audio signal from power carrier line, after reaching reproduction time, playing audio signal.Main playback equipment up to
To after reproduction time, playing audio signal realizes being played simultaneously for audio signal.
Show that mono- specific implementation modes of above-mentioned steps S110, main broadcaster put device periodically and pass through electric power with reference to Fig. 4, Fig. 4
Power carrier signal of the line output comprising solicited message is specifically included at least one from playback equipment：
Step S111, main broadcaster puts the generation solicited message of device periodically.
Specifically, according to respectively from the local zone time of the local zone time of playback equipment and main playback equipment there are clock skew,
In order to realize audio sync, main playback equipment is needed and is respectively communicated from playback equipment foundation, main to carry out the calibration of local zone time
Playback equipment establishes connection by power line and respectively from playback equipment, and generates solicited message to complete the communication of information, at this time
The solicited message of generation is digital signal.
Step S112, solicited message is modulated to power carrier signal.
Specifically, main playback equipment and being connected from being established by power line between playback equipment, the letter transmitted in power line
Number attribute is analog signal, therefore main playback equipment needs solicited message being modulated as power carrier signal, to complete
Information stablizes transmission.
Step S113, power carrier signal is sent to at least one from playback equipment, and record electricity by power line
The sending time of carrier signal, wherein using the sending time of power carrier signal as the sending time of solicited message.
Specifically, main playback equipment by power carrier signal transmit it is at least one from playback equipment while, record electricity
It the time that carrier signal is sent, and is stored in main playback equipment, main playback equipment and logical from completing to shake hands between playback equipment
Letter, master and slave playback equipment works according to set communications protocol in power line, by solicited message it is safe, reliable, efficient pass
It is sent to other equipment.
With reference to Fig. 5, Fig. 5 shows mono- specific implementation modes of above-mentioned steps S120, specifically, received by power line described in
It is at least one to include the power carrier signal of response message from what playback equipment exported, and it is specific to demodulate the acquisition response message
Including：
Step S121, main playback equipment by power line receive it is at least one exported from playback equipment include response message
Power carrier signal.
Specifically, main playback equipment is by the power carrier signal that is received from power line, and therefrom demodulate response
Information, at this time main playback equipment realize the process that analog signal is converted to digital signal.
Step S122, from least one, demodulation obtains corresponding response letter from the power carrier signal that playback equipment exports
Breath, while the receiving time of recording responses information.
Specifically, main playback equipment establishes communication connection with from playback equipment, request signal is being received from playback equipment
When, the time T2 that record solicited message reaches, while corresponding response is exported according to the solicited message that main playback equipment is sent and is believed
It ceases, and the time T3 of recording responses delivering, receiving time T2 and response message with solicited message in response message
Send out time T3 information, temporal information is followed by response message and is sent to main playback equipment together, and main playback equipment is receiving
To after response message, the time T4 that recording responses information reaches, main playback equipment is according to the transmitting-receiving of solicited message and response message
Time and preset algorithm determine and respectively from the clock offset times of playback equipment and one-way delay times, respectively from playback equipment root
Local zone time is corrected according to the clock offset times of main playback equipment, improves the reliability of sound system.
With reference to Fig. 6, Fig. 6 shows mono- specific implementation modes of above-mentioned steps S130, specifically, according to the transmission of solicited message
And transmission and the receiving time of receiving time and response message, determine main playback equipment at least one from the unidirectional of playback equipment
Delay time and clock offset times specifically include：
Step S131, the first deviation time is determined according to the sending time of solicited message and receiving time.
Specifically, because there are network delay, main playback equipment sends signal and can not reach immediately respectively from playback equipment, and
There are regular hour delays, but because main playback equipment with from playback equipment local zone time there is also inconsistent, so request disappears
There are certain deviations for breath sending time and receiving time, which is defined as the first deviation time Tms1, the deviation
Time Tms1 represents main, playback equipment extremely from the sum of the propagation delay time of playback equipment and clock offset times, i.e. Tms1=
T2-T1=Tdey+ Δ T, Tdey representation signal propagation delay time, Δ T represent clock offset times, clock offset times.
Step S132, the sending time of information and receiving time determine the second deviation time according to response.
Similarly, the time T3 that response message is sent from playback equipment receives the time T4 of response message with main playback equipment
There are the deviations of network delay and local zone time, and therefore, time T3 and T4 are simultaneously unequal, in the present embodiment, by time T4 and body
The deviation time of T3 is defined as the second deviation time Tms2, and calculation formula is：Tms2=T4-T3=TdeyΔ T, Tdey representative
Delay time, Δ T represent clock offset times.
When step S133, determining the one-way delay of master and slave playback equipment according to the first deviation time and the second deviation time
Between and clock offset times.
After the first deviation time Tms1 and the second deviation time Tms2 is determined, according to equation：
After one-way delay time Tdey and clock offset times Δ T is determined, from playback equipment according to clock skew
Time and local zone time redefine the reproduction time of itself, to realize with main playback equipment playing audio signal simultaneously,
By formula it is found that
Clock offset times Δ T is subtracted equal to main playback equipment through the one-way delay time from playback equipment local zone time
It is equal after Tdey delays, respectively rear synchronously playing audio frequency signal is adjusted from playback equipment local zone time.
Based on above-mentioned audio synchronization method, the present invention also proposes a kind of audio synchronization method, in audio sync side of the present invention
Method is another to be applied in example, as shown in fig. 7, the audio synchronization method includes：
Step S210, from playback equipment by power line receive by the main broadcaster put that device periodically sends out comprising request
The power carrier signal of information, and corresponding output response message, the response message carry solicited message receiving time and
Response message sending time.
It the state to be received and forward signal such as is constantly in from playback equipment, is put from main broadcaster by power line cycle
Equipment receives solicited message, and records the time of solicited message reception, from broadcasting after carrying out dissection process to solicited message
Equipment corresponds to output response message and from the playback equipment recording responses delivering time, and is stored in when exporting response message
In response message.
Step S220, it is put and is set to the main broadcaster by power carrier signal of the power line modulation output comprising response message
It is standby, so that main playback equipment is true according to the transmission of the solicited message and the transmission of receiving time and response message and receiving time
Fixed main playback equipment with from the one-way delay time of playback equipment and clock offset times.
After playback equipment exports response message, it can not transmitted in power line since response message is digital signal,
It needs to be modulated and be output in power line for power carrier signal, after main playback equipment demodulation receives response message, record is rung
Information receiving time is answered, while obtaining the time that solicited message receives and the time that response message is sent out, before this, main broadcaster
It puts equipment and equally has recorded the time that solicited message is sent out when sending out solicited message, therefore, main playback equipment is believed according to request
Breath and response message transmitting-receiving four time points can determine main playback equipment and between playback equipment the one-way delay time and
Clock offset times, one-way delay time are the time needed for solicited message or response message transmission process, when clock skew
Between be main playback equipment and the deviation time from playback equipment local zone time.
Step S230, by power line receive comprising clock offset times power carrier signal and demodulate obtain clock it is inclined
Shift time, while correcting local zone time according to clock offset times.
Specifically, main playback equipment passes through power line tune after clock offset times are determined, by the clock offset times
System is output to from playback equipment, current local zone time is corrected according to clock offset times from playback equipment, as shown in figure 3, example
Such as when main playback equipment sends out solicited message in T1 equal to 101 moment, being equal to 106 in T2 from playback equipment receives solicited message,
Then according to Tms1=T2-T1=TdeyIt is found that Tms1 is equal to 5, send out response equal to 111 moment in T3 from playback equipment believes+Δ T
Breath, main playback equipment is in 108 reception response messages, then according to Tms2=T4-T3=TdeyΔ T it is found that Tms2 be equal to -3,
Thus, it can be known that TdeyEqual to 1, it is equal to 4, corrects local zone time after T2 receptions to absolute drift time from playback equipment, i.e.,
Revised time T2=(106-4)=102, main playback equipment is through delay time TdeyTime T1=101+1=after delay
102, therefore, master and slave playback equipment realizes clock synchronization.
Step S240, audio signal is obtained, determines reproduction time, and according to reproduction time playing audio signal.
Wherein, audio signal can be obtained from other playback equipments from playback equipment, can also be obtained from external equipment
Take audio signal.
Specifically, when other playback equipments are to from playback equipment transmission audio signal, at this point, obtaining sound from playback equipment
Frequency signal determines that reproduction time includes：The power carrier signal for including audio signal is received from power carrier line.Parsing includes
The power carrier signal of audio signal obtains audio signal, and determines reproduction time from audio signal.Wherein, audio signal
In carry reproduction time.
That is, from playback equipment after receiving the power carrier signal comprising audio signal in power carrier line, solution
This power carrier signal is adjusted, to obtain audio signal, reproduction time is carried in audio signal, audio signal can be parsed,
Obtain reproduction time.After reaching reproduction time, playing audio signal.
When obtaining audio signal from external equipment from playback equipment, the audio signal that will be obtained also is needed to send out from playback equipment
It send to other playback equipments, obtains audio signal from playback equipment at this time, determine that reproduction time includes：From playback equipment from outside
Equipment obtains audio signal and reproduction time.From playback equipment after determining reproduction time, also need to execute following step, i.e.,
For reproduction time is added to audio signal from playback equipment, other playback equipments are sent to by power carrier line
That is, getting audio signal to be played from playback equipment from external equipment.It provides and broadcasts in external equipment
When putting the time, it is determined as reproduction time from the reproduction time that equipment can be provided with external equipment is broadcast.It is not provided in external equipment
When reproduction time, reproduction time can be determined according to preset rules.For example, preset rules are：Receive 1 point after audio signal
It is played after clock or other rules, the present invention is without limitation.From playback equipment after determining reproduction time, it will determine
The reproduction time gone out is added to audio signal, is power carrier signal by this modulates audio signals, and passed by power carrier line
Other playback equipments are transported to, so that other playback equipments get audio signal from power carrier line, are reaching reproduction time
Afterwards, playing audio signal.From playback equipment after reaching reproduction time, playing audio signal realizes the synchronization of audio signal for this
It plays.
As shown in figure 8, in further carrying out example, it includes to ask to be received from playback equipment periodically through power line demodulation
Seek the power carrier signal of information, and corresponding output response message, the response message carry solicited message receiving time with
And response message sending time specifically includes：
Step S211, it includes solicited message to receive put that device periodically sends out by main broadcaster by power line from playback equipment
Power carrier signal.
Specifically, being connect with main playback equipment from playback equipment by power line, it is constantly in state to be received, Zhu Bofang
Device periodically is sent out in the power carrier signal to power line comprising solicited message, is then connect from power line from playback equipment
Power carrier signal is received, and demodulation process is carried out to power carrier signal.
Step S212, from the power carrier signal that the main playback equipment is sent out, demodulation obtains solicited message, and records
The receiving time of solicited message.
Specifically, from playback equipment after correcting local clock as time goes by, local clock is due to clock speed
Problem cause with main playback equipment nonsynchronous problem again, so, periodically connect from playback equipment needs by power line
Solicited message is received, to realize the Continued communication with main playback equipment, demodulates and handles from playback equipment by solicited message, and
Record the receiving time of solicited message.
Step S213, output response message is corresponded to according to solicited message, and recording responses information sends out the time.
When continuing to keep communicating with main playback equipment from playback equipment, according to the solicited message that main playback equipment is sent out,
Output response message is corresponded to from playback equipment, it is normal with characterization communication, meanwhile, from playback equipment recording responses information when sending out
Between, and the receiving time for sending out time and solicited message of response message is stored in response message, to main playback equipment
The receiving time of solicited message known to information and response message send out the time according to response.
As shown in figure 9, the present invention also proposes a kind of audio synchronization system, including main playback equipment and at least one from broadcasting
Equipment, main playback equipment and at least one is connected between playback equipment by power line.
It should be noted that playback equipment can be with to audio conversion devices send audio signal function have send out
Equipment of acoustic device, such as active audio amplifier, passive loudspeaker box, loud speaker or loudspeaker etc., do not limit herein, main in the present embodiment
It playback equipment and can be directly connected to from playback equipment with power line, socket or other connectors can also be passed through and connected with power line
It connects, facilitates installing and dismounting.
Further, can be one from playback equipment, or it is multiple, it is selected according to actual installation scene.
The present invention carries out the transmission of audio signal by way of power line carrier, can effectively reduce the number of audio transmission cable
Amount, improves the reliability of audio synchronization system, and when needing to extend sound channel, only need to need to be to be mounted from playback equipment
The extension that sound channel can be realized is connect with power line.
Main playback equipment, for realizing the equipment of the audio synchronization method of the main playback equipment of foregoing description, main playback equipment
When work, the power carrier signal and/or audio signal for including solicited message are sent, the electric power comprising response message is received and carries
Wave signal, record solicited message send out time and response message receiving time, while obtain solicited message reception time with
And the time that response message is sent out, to determine that the one-way delay time between principal and subordinate's playback equipment is timely according to four time points
Clock shift time, main playback equipment receives the audio signal that external equipment is sent, and this audio signal is passed through power line transmission
To respectively from playback equipment.
From playback equipment, for realizing the equipment of the above-mentioned audio synchronization method from playback equipment, from playback equipment then from
Clock offset times and/or audio signal are demodulated in power line, and respective local zone time is corrected according to clock shift time, are repaiied
Time after just and time consistency of the main playback equipment after one-way delay time delay, after reaching reproduction time while exporting
Audio signal, to realize the synchronism output of audio signal.
As shown in Figure 10, in audio synchronization system of the present invention in an embodiment, main playback equipment includes the first modulatedemodulate
Device 11, the first controller 12 and the first player 13,11 one end of the first modem is adjusted to connect power line, the other end and first
Controller 12 connects, and the first controller 12 is also connect with the first player 13.
Specifically, first modem 11 is used to the signal received being modulated output or demodulation receives
Signal realizes that the conversion of digital and analogue signals, the first controller 12 are rung for receiving audio signal and sending solicited message and receive
Answer information, and record solicited message and send out time and response message receiving time, according to preset algorithm confirm main playback equipment with
From between playback equipment the one-way delay time and clock offset times, and control first is broadcast after the one-way delay time that is delayed
It puts device 13 and plays the audio signal received.
As shown in figure 11, include the second modulation from playback equipment in audio synchronization system of the present invention in another embodiment
Demodulator 21, second controller 22 and the second player 23, as shown in figure 11, one end of second modem 21 connect electric power
Line, the other end are connect with second controller 22, and second controller 22 is also connect with the second player 23.
Second modem 21 is used for modulated received signal and demodulated output signal, second controller 22 from power line
For receiving solicited message and sending response message, and record solicited message receiving time and response message sends out the time,
Temporal information is stored in the first controller 12 being sent in response message in main playback equipment simultaneously, is incited somebody to action in main playback equipment
The audio signal played is needed to be sent in second modem 21 by power line, second modem 21 believes audio
It number demodulates and is sent in second controller 22, second controller 22 corrects after the local zone time of itself exports audio signal to the
Two players 23 realize audio sync output.
Hereinafter, illustrating the operation principle of audio synchronization system of the present invention in conjunction with Fig. 1 to Figure 11：
First, the first controller 12 of main playback equipment 10 is carried out at least one from the second controller 22 of playback equipment
Interactive communication, determine with from playback equipment clock offset times and pass through the first controller 12 receive audio signal.Then,
Clock offset times and audio signal are output to power line by the first modem 11 modulation of main playback equipment 10.
Then, clock offset times and audio letter are demodulated from power line from the second modem of playback equipment 21
Number.
Finally, reproduction time is determined from the second controller of playback equipment 22 according to clock offset times, and when playing
Between arrive after by 23 synchronously playing audio frequency signal of the second player, while the first controller 12 of main playback equipment is unidirectional in delay
13 playing audio signal of the first player is controlled after delay time.Audio synchronization system of the present invention carries out sound by power line carrier
The transmission of frequency signal, simplifies the line construction of sound system, while the extension of sound system being facilitated to upgrade, and main broadcaster is put and set
It is standby to communicate the broadcasting for completing principal and subordinate's playback equipment at least one interacted on the basis of power line carrier from playback equipment
Time synchronization, and then realize each playback equipment synchronous cant of audio synchronization system.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
In the scope of patent protection that other related technical areas are included in the present invention.
Claims (13)
1. a kind of audio synchronization method, which is characterized in that be applied to audio synchronization system, the audio synchronization system includes main broadcaster
It puts equipment and at least one from playback equipment, the main playback equipment and at least one is connected between playback equipment by power line
It connects；The audio synchronization method includes：
The main broadcaster put device periodically by the power line output comprising solicited message power carrier signal to it is described extremely
Lack one from playback equipment；
At least one power carrier signal for including response message exported from playback equipment is received by the power line,
And demodulate and obtain the response message, the response message carry the corresponding solicited message receiving time from playback equipment and
Response message sending time；
According to the transmission of the transmission of the solicited message and receiving time and the response message and receiving time, the master is determined
Playback equipment with it is described at least one from the one-way delay time of playback equipment and clock offset times；
The main power carrier signal of the playback equipment modulation output comprising the clock offset times is set to corresponding from broadcasting
It is standby, for described local zone time is corrected according to the clock offset times from playback equipment；
Main broadcaster's equipment obtains audio signal, determines reproduction time, and according to the reproduction time, playing audio signal.
2. audio synchronization method according to claim 1, which is characterized in that main broadcaster's equipment obtains audio signal, really
Determining reproduction time includes：
The power carrier signal for including the audio signal is received from the power carrier line；Wherein, in the audio signal
Carry reproduction time；
Include the power carrier signal of the audio signal described in parsing, obtains audio signal, and from the audio signal really
Determine reproduction time.
3. audio synchronization method according to claim 1, which is characterized in that main broadcaster's equipment obtains audio signal, really
Determine reproduction time, and according to the reproduction time, playing audio signal includes：
The main playback equipment obtains audio signal from external equipment, and according to each one-way delay time from playback equipment,
Determine the reproduction time of audio signal；
The main playback equipment carries the audio of reproduction time by the power carrier line to described sent from playback equipment
Signal；
The main playback equipment plays the audio signal when reaching reproduction time.
4. audio synchronization method according to claim 1, which is characterized in that the main broadcaster puts device periodically described in
Power carrier signal of the power line output comprising solicited message at least one is specifically included to described from playback equipment：
The main broadcaster puts the generation solicited message of device periodically；
The solicited message is modulated to power carrier signal；
The power carrier signal is sent to by power line described at least one from playback equipment, and records the electric power and carry
The sending time of wave signal, wherein using the sending time of the power carrier signal as the sending time of the solicited message.
5. audio synchronization method according to claim 4, which is characterized in that it is described by the power line receive described in extremely
Few one includes the power carrier signal of response message from what playback equipment exported, and demodulates the acquisition response message and specifically wrap
It includes：
The main playback equipment by the power line receive it is described it is at least one exported from playback equipment include response message
Power carrier signal；
The response message is obtained from least one demodulation from the power carrier signal that playback equipment exports, and records sound
Answer the receiving time of information.
6. audio synchronization method according to claim 5, which is characterized in that the transmission according to the solicited message and
The transmission of receiving time and response message and receiving time, determine the main playback equipment with it is described at least one from playback equipment
The one-way delay time and clock offset times specifically include：
The first deviation time is determined according to the sending time of the solicited message and receiving time；
The second deviation time is determined according to the sending time of the response message and receiving time；
According to first deviation time and the second deviation time determine main playback equipment with it is described at least one from playback equipment
The one-way delay time and clock offset times.
7. a kind of audio synchronization method, which is characterized in that be applied to audio synchronization system, the audio synchronization system includes main broadcaster
Put equipment and at least one from playback equipment, the main playback equipment and at least one from passing through power carrier line between playback equipment
Connection；The audio synchronization method includes：
It is described to receive that put that device periodically sends out by the main broadcaster includes solicited message by the power line from playback equipment
Power carrier signal, and corresponding output response message, the response message carry solicited message receiving time and response
Access time；
By power carrier signal of the power line modulation output comprising response message to the main playback equipment, so that described
Main playback equipment determines main broadcaster according to the transmission of the solicited message and the transmission of receiving time and response message and receiving time
Put equipment with from the one-way delay time of playback equipment and clock offset times；
The power carrier signal comprising the clock offset times is received by the power line and demodulates that obtain the clock inclined
Shift time, while correcting local zone time according to the clock offset times；
Audio signal is obtained, determines reproduction time, and the audio signal is played according to the reproduction time.
8. the method according to the description of claim 7 is characterized in that the acquisition audio signal, determines that reproduction time includes：
The power carrier signal for including audio signal is received from power carrier line；
The power carrier signal is parsed, the audio signal is obtained；Reproduction time is carried in the audio signal；
The reproduction time is determined in the audio signal.
9. the method according to the description of claim 7 is characterized in that the acquisition audio signal, determines that reproduction time includes：
Audio signal and reproduction time are obtained from external equipment；
After the determining reproduction time, further include：
The reproduction time is added to the audio signal, other playback equipments are sent to by the power carrier line.
10. audio synchronization method according to claim 7, which is characterized in that it is described from playback equipment periodically through institute
It states power line demodulation and receives the power carrier signal for including solicited message, and corresponding output response message, the response message
It carries solicited message receiving time and response message sending time specifically includes：
It is described to receive that put that device periodically sends out by the main broadcaster includes solicited message by the power line from playback equipment
Power carrier signal；
Demodulation obtains solicited message from the power carrier signal that the main playback equipment is sent out, and records the reception of solicited message
Time；
Output response message, and the sending time of recording responses information are corresponded to according to solicited message.
11. a kind of audio synchronization system, which is characterized in that including main playback equipment and at least one from playback equipment, the master
It playback equipment and at least one is connected between playback equipment by power line；Wherein,
The main playback equipment is the equipment for executing the claims 1-6 any one of them audio synchronization methods；
It is described from playback equipment be the equipment for executing upper claim 7-10 any one of them audio synchronization methods.
12. audio synchronization system according to claim 11, which is characterized in that the main playback equipment includes the first modulation
Demodulator, the first controller and the first player；First modem one end connects the power line, the other end and institute
The connection of the first controller is stated, first controller is also connect with first player.
13. audio synchronization system according to claim 11, which is characterized in that described to include the second modulation from playback equipment
Demodulator, second controller and the second player；One end of the second modem connects the power line, the other end with
The second controller connection, the second controller are also connect with second player.
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| PCT/CN2018/099270 WO2019196273A1 (en) | 2018-04-09 | 2018-08-08 | Audio synchronization method and system |
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| CN111147907A (en) * | 2019-12-26 | 2020-05-12 | 深圳市优必选科技股份有限公司 | Method, device and system for synchronously playing multiple intelligent terminals and intelligent terminal |
| WO2021168997A1 (en) * | 2020-02-28 | 2021-09-02 | 捷开通讯(深圳)有限公司 | Multidevice audio playback correction method and apparatus |
| CN112684992A (en) * | 2020-12-18 | 2021-04-20 | 深圳乐播科技有限公司 | Method and device for realizing screen-casting playing synchronization and computer main equipment |
| CN113300797A (en) * | 2021-03-29 | 2021-08-24 | 广州市保伦电子有限公司 | Multi-device self-adaptive audio synchronous playing method and processing terminal |
| CN113179443A (en) * | 2021-04-20 | 2021-07-27 | 深圳无界视觉科技有限责任公司 | Multi-channel distributed synchronous play control method and system |
| WO2023070374A1 (en) * | 2021-10-27 | 2023-05-04 | 京东方科技集团股份有限公司 | Audio and video synchronization method and apparatus, storage medium, and electronic device |
| CN114339294A (en) * | 2022-01-04 | 2022-04-12 | 腾讯科技（深圳）有限公司 | Network jitter confirmation method, device, equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108449630B (en) | 2020-05-22 |
| WO2019196273A1 (en) | 2019-10-17 |
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