CN108449630B - Audio synchronization method and system - Google Patents
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- 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
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- 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
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Abstract
The invention discloses an audio synchronization method and an audio synchronization system, wherein the audio synchronization method comprises the following steps: the master playing device periodically outputs a power carrier signal containing the request information to at least one slave playing device through a power line; receiving at least one power carrier signal containing response information output from the playing equipment through a power line, and demodulating to obtain the response information, wherein the response information carries corresponding request information receiving time and response information sending time of the playing equipment; determining the one-way delay time and the clock offset time of the master playing device and at least one slave playing device according to the sending and receiving time of the request information and the response information; and the modulation output of the main playing device comprises clock offset time to the corresponding slave playing device, so that the slave playing device corrects the local time according to the clock offset time. Compared with the prior art, the technical scheme of the invention can simplify the circuit structure of the sound system and reliably realize the synchronous audio playing.
Description
Technical Field
The invention relates to the technical field of sound systems, in particular to an audio synchronization method and system.
Background
The sound system is characterized in that a sound wave signal of original sound production field sound is converted into an electric signal by a microphone, the electric signal is correspondingly processed according to a certain requirement, finally the electric signal is converted into the sound wave signal by a loudspeaker for reproduction, a cable structure can be effectively simplified in a multi-channel sound system by adopting a power line carrier mode, the reliability of an audio synchronization system is improved, and the audio signal can be played by only connecting a playing device with a power line for expanding a sound channel. However, when playing audio signals, the playing devices have different local times, and there is propagation delay between the slave playing device and the master playing device, which causes asynchronous playing of the audio signals, thereby resulting in the decrease of the sound quality of the sound system and the reliability of the sound system.
Disclosure of Invention
The invention mainly aims to provide an audio synchronization method, aiming at improving the reliability of a sound system.
In order to achieve the above object, the audio synchronization method provided by the present invention is applied to an audio synchronization system, where the system includes a master playback device and at least one slave playback device, and the master playback device is connected to the at least one slave playback device through a power line; the audio synchronization method comprises the following steps:
the master playing device periodically outputs a power carrier signal containing request information to the at least one slave playing device through the power line; receiving the power carrier signal containing the response information output by the at least one slave playing device through the power line, and demodulating to obtain the response information, wherein the response information carries the request information receiving time and the response information sending time of the corresponding slave playing device; determining the one-way delay time and the clock offset time of the master playing device and the at least one slave playing device according to the sending and receiving time of the request information, the sending and receiving time of the response information and a preset formula, wherein the preset formula is as follows:
wherein, T1 is the time of request message transmission, T2 is the time of request message reception, T3 is the time of response message transmission, T4 is the time of response message reception, Δ T is the clock offset time, TdeyIs a one-way delay time; the master playing device modulates and outputs a power carrier signal containing the clock offset time to a corresponding slave playing device so that the slave playing device corrects local time according to the clock offset time; the main playing device acquires the audio signal, determines the playing time and plays the audio signal according to the playing time.
Preferably, the main playback device acquires an audio signal, and determining the playback time includes: receiving a power carrier signal containing the audio signal from the power line; wherein, the audio signal carries playing time; and analyzing the power carrier signal containing the audio signal, acquiring the audio signal, and determining the playing time from the audio signal.
Preferably, the main playback device obtains an audio signal, determines a playback time, and according to the playback time, playing back the audio signal includes: the master playing device acquires the audio signals from the external device and determines the playing time of the audio signals according to the one-way delay time of each slave playing device; the master playing device sends an audio signal carrying playing time to the slave playing device through the power line; and when the main playing equipment reaches the playing time, playing the audio signal.
Preferably, the periodically outputting, by the master playback device through the power line, a power carrier signal including request information to the at least one slave playback device specifically includes: the main playing device periodically generates request information; modulating the request information into a power carrier signal; and transmitting the power carrier signal to the at least one slave playing device through a power line, and recording the transmission time of the power carrier signal, wherein the transmission time of the power carrier signal is taken as the transmission time of the request information.
Preferably, the receiving, by the power line, the at least one power carrier signal including response information output from the playback device, and demodulating to obtain the response information specifically includes: the main playing device receives the power carrier signal containing the response information output by the at least one slave playing device through the power line; and demodulating the at least one power carrier signal output from the playing equipment to obtain the response information, and recording the receiving time of the response information.
Preferably, the determining the one-way delay time and the clock offset time of the master playback device and the at least one slave playback device according to the sending and receiving time of the request message and the sending and receiving time of the response message specifically includes: determining a first deviation time according to the sending time and the receiving time of the request information; determining a second deviation time according to the sending time and the receiving time of the response information; and determining the one-way delay time and the clock offset time of the master playing device and the at least one slave playing device according to the first deviation time and the second deviation time.
The invention also provides an audio synchronization method, which is applied to an audio synchronization system, wherein the audio synchronization system comprises a master playing device and at least one slave playing device, and the master playing device is connected with the at least one slave playing device through a power line; the audio synchronization method comprises the following steps:
the slave playing device receives a power line carrier signal which is periodically sent by the master playing device and contains request information through the power line, and correspondingly outputs response information, wherein the response information carries request information receiving time and response information sending time; the power line modulation outputs a power carrier signal containing response information to the main playing device, so that the main playing device determines the one-way delay time and the clock offset time of the main playing device and the slave playing device according to the sending and receiving time of the request information and the sending and receiving time of the response information; receiving a power line carrier signal containing the clock offset time through the power line, demodulating and acquiring the clock offset time, and correcting local time according to the clock offset time; acquiring an audio signal, determining playing time, and playing the audio signal according to the playing time.
Preferably, the acquiring the audio signal and the determining the playing time includes: receiving a power carrier signal containing an audio signal from a power line; analyzing the power carrier signal to obtain the audio signal; the audio signal carries playing time; the playing time is determined in the audio signal.
Preferably, the acquiring the audio signal and the determining the playing time includes: acquiring an audio signal and playing time from external equipment; after the determining the playing time, further comprising: and adding the playing time to the audio signal, and sending the audio signal to other playing equipment through the power line.
Preferably, the slave playback device periodically receives the power carrier signal containing the request information through the power line demodulation, and correspondingly outputs the response information, where the response information carrying the request information receiving time and the response information sending time specifically includes: the slave playing device receives a power line carrier signal which is periodically sent by the master playing device and contains request information through the power line; demodulating and obtaining request information from the power carrier signal sent by the main playing device, and recording the receiving time of the request information; and correspondingly outputting response information according to the request information, and recording the sending time of the response information.
The invention also provides an audio synchronization system, which comprises a master playing device and at least one slave playing device, wherein the master playing device is connected with the at least one slave playing device through a power line; wherein the content of the first and second substances,
the main playing device is a device for executing the audio synchronization method of the main playing device; the slave playback device is a device that performs the audio synchronization method of the slave playback device as described above.
Preferably, the master playing device includes a first modem, a first controller and a first player; one end of the first modem is connected with the power line, the other end of the first modem is connected with the first controller, and the first controller is further connected with the first player.
Preferably, the slave playing device comprises a second modem, a second controller and a second player; one end of the second modem is connected with the power line, the other end of the second modem is connected with the second controller, and the second controller is further connected with the second player.
The audio synchronization method of the invention comprises the following steps: firstly, the master playing device periodically outputs a power carrier signal containing request information and a power signal to at least one slave playing device through a power line; then, receiving at least one power line carrier signal containing response information output from the playing device through a power line, and demodulating to obtain the response information, wherein the response information carries corresponding request information receiving time and response information sending time of the playing device; then, according to the sending and receiving time of the request information and the response information, determining the one-way delay time and the clock offset time of the master playing device and at least one slave playing device; then, the master playing device modulates and outputs a power carrier signal containing clock offset time to the corresponding slave playing device, so that the slave playing device corrects local time according to the clock offset time; and finally, outputting the audio signal to be played to corresponding slave playing equipment through a power line, and playing the audio signal after delaying the one-way delay time so as to synchronously play the audio signal with the slave playing equipment.
The technical scheme includes that the unidirectional delay time and the clock offset time between the master playing device and the slave playing device are determined according to the request information and the response information sent and received by the power line, the slave playing device adjusts the local time according to the clock offset time, the time of the slave playing device is consistent with that of the master playing device, signals are transmitted through the power line, the system structure is simplified, when the audio signals are played, the master playing device plays the audio signals after the unidirectional delay time, the slave playing device plays the audio signals after the local time is corrected according to the clock offset time, therefore, audio synchronous playing of the master playing device and the slave playing device is achieved, and reliability of a synchronous sound system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a sound synchronization system;
FIG. 2 is a flowchart illustrating a first embodiment of an audio synchronization method according to the present invention;
FIG. 3 is a schematic diagram of the playing time of the master and slave playing devices of the audio synchronization method according to the present invention;
FIG. 4 is a detailed flowchart of step S110 in FIG. 2;
FIG. 5 is a detailed flowchart of step S120 in FIG. 2;
FIG. 6 is a detailed flowchart of step S130 in FIG. 2;
FIG. 7 is a flowchart illustrating an audio synchronization method according to another embodiment of the present invention;
FIG. 8 is a detailed flowchart of step S210 in FIG. 7;
FIG. 9 is a schematic diagram of an audio synchronization system according to the present invention;
FIG. 10 is a schematic diagram of a main playback device of the audio synchronization system according to the present invention;
FIG. 11 is a schematic diagram of a slave playback device of the audio synchronization system of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the descriptions relating to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an audio synchronization method, which is applied to an audio synchronization system, wherein the audio synchronization system comprises a main playing device and at least one slave playing device, and the main playing device is connected with the at least one slave playing device through a power line.
It should be noted that the playing device may be a device with a sound generating device, such as an active sound box, a passive sound box, a speaker, or a loudspeaker, which has a function of sending an audio signal to the audio conversion device, and is not limited herein. In the embodiment, the master playing device and the slave playing devices can be directly connected with the power line, and can also be connected with the power line through a socket or other connectors, so that the mounting and dismounting are convenient, one or more slave playing devices can be selected according to the actual mounting site, the audio signal transmission is carried out in a power line carrier mode, the number of audio transmission cables can be effectively reduced, the reliability of an audio synchronization system is improved, and when the sound channel needs to be expanded, the sound channel can be expanded only by connecting the slave playing devices needing to be mounted with the power line.
It can be understood that, based on the above audio synchronization system, the audio synchronization method provided by the present invention can achieve the purpose of synchronous playing between the master playing device and the multiple slave playing devices, and a plurality of embodiments of the audio synchronization method provided by the present invention for achieving the foregoing purpose are respectively described below.
Referring to fig. 2, a first embodiment of the audio synchronization method of the present invention is shown, and in the first embodiment, the audio synchronization method proposed by the present invention includes:
step S110, the master playback device periodically outputs a power carrier signal containing request information to the at least one slave playback device through the power line.
Specifically, in order to enable the request information to be transmitted from the power line, the master playback device outputs the request information, modulates and converts the request information into a power carrier signal, transmits the power carrier signal to the power line so as to transmit the power carrier signal to each slave playback device through the power line, and demodulates and converts the received power carrier signal into the request information when each slave playback device receives the power carrier signal from the power line. Meanwhile, when the master playing device sends the request information, the time T1 when the request information is actually sent is recorded, and when the request information is sent, the time T1 is carried to the slave playing device.
It should be noted that the time interval during which the main playback device periodically sends the request message may be determined to be a suitable value, for example, 1 to 2 seconds, according to experimental parameters, so as to avoid that the communication load is heavy when the time interval is too short, and to avoid that the synchronization accuracy is low when the time interval is too long.
Step S120, at least one power carrier signal containing the response information and output from the playing device is received through the power line, and the response information is obtained through demodulation.
The response information carries corresponding request information receiving time and response information sending time of the slave playing device.
Specifically, the slave playing device receives the power carrier signal through the power line and demodulates the request information, meanwhile, the slave playing device records the time T2 for receiving the request information, then outputs corresponding response information and records the time T3 for sending the response information, the response information output from the playing device is similarly modulated, modulated into the power carrier signal and transmits the power carrier signal to the power line, and the master playing device receives the power carrier signal through the power line and demodulates and receives the response information, and records the receiving time T4 of the response information.
Step S130, determining the one-way delay time and the clock offset time of the master playback device and the at least one slave playback device according to the sending and receiving time of the request message and the sending and receiving time of the response message.
Specifically, the master playback device calculates the total round-trip delay of the message according to the time of sending the request message and the time of returning the response message, and according to the symmetry of the network, the transmission delays in both directions are the same, and then half of the total round-trip delay is the one-way delay, as shown in fig. 3, since the local time of the master and slave playback devices has clock skew due to the clock speed, the first skew time Tms1 between the request message receiving time T2 and the request message sending time T1 is equal to the sum of the one-way delay time and the clock skew time, that is:
Tms1＝T2-T1＝Tdey+ΔT
Tdeydelay time of signal propagationAs can be seen from fig. 3, the second offset time Tms2 of the response information receiving time T4 and the sending time T3 is equal to the difference between the one-way delay time and the clock offset time, namely:
Tms2＝T4-T3＝Tdey-ΔT
then, according to the above calculation formula, it can be obtained:
therefore, the clock offset time and the one-way delay time of each master playing device and each slave playing device are determined according to the sending and receiving time of the request information and the sending and receiving time of the response information.
Step S140, the master playback device modulates and outputs a power carrier signal containing the clock offset time to the corresponding slave playback device, so that the slave playback device corrects the local time according to the clock offset time.
Specifically, the master playing device modulates the clock offset time into a power carrier signal and outputs the power carrier signal to the slave playing device through a power line, the slave playing device demodulates the clock offset time from the power carrier signal, the slave playing device corrects the local time according to the clock offset time, and the corrected local time of the slave playing device is consistent with the time of the master playing device after the unidirectional delay time is delayed. As shown in FIG. 3, for example, when the master playback device issues a request message at a time T1 equal to 101, the slave playback device at T2, etcReceiving the request message at 106, according to Tms1＝T2-T1＝Tdey+ Δ T, Tms1 equals 5, the slave playback device sends a response message at a time T3 equals 111, and the master playback device receives a response message at a time T108, based on Tms2＝T4-T3＝TdeyTms2 equals-3, knowing TdeyEqual to 1, Δ T equal to 4. Further, the master playback device transmits the clock offset time of the slave playback device to the slave playback device at time T1. The slave playback device corrects the local time after receiving the clock offset time at time T2, i.e. the corrected time T2 is (106-4) is 102, and the master playback device delays the time TdeyThe delayed time T1 is 101+ 1-102, so that the master and slave playback devices achieve clock synchronization.
Step S150, the main playback device obtains the audio signal, determines the playback time, and plays the audio signal according to the playback time.
The main playback device may obtain the audio signal from other playback devices, or may obtain the audio signal from an external device.
Specifically, when other playback devices transmit an audio signal to the main playback device, at this time, the main playback device acquires the audio signal, and determining the playback time includes: a power carrier signal containing an audio signal is received from a power line. And analyzing the power carrier signal containing the audio signal, acquiring the audio signal, and determining the playing time from the audio signal. The audio signal carries a playing time.
That is to say, after receiving the power carrier signal containing the audio signal from the power line, the main playback device demodulates the power carrier signal, thereby obtaining the audio signal, where the audio signal carries the playback time, and the audio signal can be analyzed to obtain the playback time. And playing the audio signal after the playing time is reached.
When main playback devices obtain audio signals from external equipment, main playback devices still need to send the audio signals who obtains to other slave playback devices, and main playback devices obtains audio signals this moment, confirms the broadcast time to according to the broadcast time, broadcast audio signals includes: the master playing device obtains the audio signals from the external devices, and determines the playing time of the audio signals according to the one-way delay time of each slave device. The master playing device sends an audio signal carrying playing time to the slave playing device through the power line. And when the main playing device reaches the playing time, playing the audio signal.
That is, the main playback device acquires the audio signal to be played from the external device. When the external device does not provide the playing time, the master playing device can determine that the playing time is greater than the maximum one-way delay time according to the one-way delay time determined by each slave playing device, and adds the determined playing time to the audio signal, the master playing device modulates the audio signal into a power carrier signal, and transmits the power carrier signal to other slave playing devices through a power line, so that other slave playing devices can acquire the audio signal from the power line, and the audio signal is played after the playing time is reached. And after the main playing device reaches the playing time, playing the audio signal to realize the synchronous playing of the audio signal.
Referring to fig. 4, in fig. 4 showing a specific implementation of the step S110, the periodically outputting, by the master playback device, the power carrier signal containing the request information to the at least one slave playback device through the power line specifically includes:
step S111, the main playback device periodically generates request information.
Specifically, according to the fact that clock offset exists between the local time of each slave playing device and the local time of the master playing device, in order to achieve audio synchronization, the master playing device needs to establish communication with each slave playing device to calibrate the local time, the master playing device establishes connection with each slave playing device through a power line and generates request information to complete information communication, and the generated request information is a digital signal.
Step S112, the request information is modulated into a power carrier signal.
Specifically, the master playback device and the slave playback device are connected through a power line, and the attribute of a signal transmitted through the power line is an analog signal, so that the master playback device needs to modulate request information into a power carrier signal, thereby completing stable transmission of information.
Step S113, transmitting the power carrier signal to at least one slave playback device through the power line, and recording the transmission time of the power carrier signal, wherein the transmission time of the power carrier signal is taken as the transmission time of the request information.
Specifically, the master playing device transmits the power carrier signal to at least one slave playing device, records the sending time of the power carrier signal, stores the sending time in the master playing device, completes handshake communication between the master playing device and the slave playing device, works according to a set communication protocol in a power line between the master playing device and the slave playing device, and safely, reliably and efficiently transmits request information to other devices.
Referring to fig. 5, fig. 5 shows a specific implementation of step S120, specifically, receiving the at least one power carrier signal including the response information output from the playback device through a power line, and demodulating to obtain the response information specifically includes:
step S121, the master playback device receives at least one power carrier signal containing response information output from the slave playback device through the power line.
Specifically, the main playing device demodulates the response information through the power carrier signal received from the power line, and at this time, the main playing device realizes the process of converting the analog signal into the digital signal.
Step S122, demodulating at least one power carrier signal output from the playing device to obtain corresponding response information, and recording the receiving time of the response information.
Specifically, the master playback device establishes a communication connection with the slave playback device, and the slave playback device, upon receiving the request signal, records the time T2 when the request information arrives, meanwhile, corresponding response information is output according to the request information sent by the main playing device, the time T3 for sending the response information is recorded, the response information comprises the receiving time T2 of the request information and the sending time T3 of the response information, the time information is sent to the main playing device along with the response information, after the main playing device receives the response information, and recording the arrival time T4 of the response message, determining the clock offset time and the one-way delay time with each slave play device by the master play device according to the transceiving time and the preset algorithm of the request message and the response message, and correcting the local time by each slave play device according to the clock offset time with the master play device to improve the reliability of the sound system.
Referring to fig. 6, fig. 6 shows a specific implementation of the step S130, specifically, determining the one-way delay time and the clock offset time of the master playback device and the at least one slave playback device according to the sending and receiving time of the request message and the sending and receiving time of the response message specifically includes:
step S131, determining a first deviation time according to the sending time and the receiving time of the request information.
Specifically, because of network delay, the master playing device cannot immediately reach each slave playing device, and there is a certain time delay, and because the local time of the master playing device is inconsistent with that of the slave playing device, there is a certain deviation between the request message sending time and the receiving time, and the deviation time is defined as a first deviation time Tms1, where Tms1 represents the sum of the propagation delay time and the clock offset time from the master playing device to the slave playing device, i.e. tsms1＝T2-T1＝Tdey+ Δ T, Tdey represents the signal propagation delay time, Δ T represents the clock skew time, clock skew time.
Step S132 determines a second deviation time according to the transmission time and the reception time of the response message.
Similarly, the time T3 when the slave playback device sends the response information and the time T4 when the master playback device receives the response information are also deviated from the network delay and the local time, so the time T3 and the time T4 are not equal, and in the present embodiment, the deviation time between the time T4 and the body T3 is defined as a second deviation time Tms2, which is calculated as: t isms2＝T4-T3＝Tdey- Δ T, Tdey representing the delay time, Δ T representing the clock offset time.
And step S133, determining the one-way delay time and the clock offset time of the master playing device and the slave playing device according to the first deviation time and the second deviation time.
After the first deviation time Tms1 and the second deviation time Tms2 are determined, it can be seen from the equation:
after the unidirectional delay time Tdey and the clock offset time Delta T are determined, the slave playing device re-determines the playing time of the slave playing device according to the clock offset time and the local time, thereby realizing the purpose of playing the audio signal simultaneously with the master playing device, which can be known by a formula,
that is, the clock offset time Δ T subtracted from the local time of the slave playing device is equal to the time when the master playing device is delayed by the one-way delay time Tdey, and the local time of each slave playing device is adjusted to synchronously play the audio signal.
Based on the foregoing audio synchronization method, the present invention further provides an audio synchronization method, in another embodiment of the audio synchronization method of the present invention, as shown in fig. 7, the audio synchronization method includes:
step S210, the slave playback device receives, through the power line, a power carrier signal including request information periodically sent by the master playback device, and correspondingly outputs response information, where the response information carries request information receiving time and response information sending time.
The slave playing device is always in a state of waiting for receiving and forwarding signals, receives request information from the master playing device periodically through a power line, records the receiving time of the request information, correspondingly outputs response information from the slave playing device after analyzing and processing the request information, and records the sending time of the response information and stores the response information in the response information when the response information is output.
Step S220, outputting the power carrier signal containing the response information to the master playback device through power line modulation, so that the master playback device determines the one-way delay time and the clock offset time of the master playback device and the slave playback device according to the sending and receiving time of the request information and the sending and receiving time of the response information.
After the slave playing device outputs the response information, because the response information is that a digital signal cannot be transmitted in the power line and needs to be modulated into a power carrier signal to be output to the power line, the master playing device records the receiving time of the response information after demodulating and receiving the response information and simultaneously obtains the receiving time of the request information and the sending time of the response information, before the receiving time of the request information and the sending time of the response information are also recorded when the master playing device sends the request information, therefore, the master playing device can determine the one-way delay time and the clock offset time between the master playing device and the slave playing device according to the four time points of receiving and sending the request information and the response information, the one-way delay time is the time required by the sending process of the request information or the response information, and the clock offset time is the local time offset time of the master playing device and the slave playing device.
Step S230, receiving the power carrier signal including the clock offset time through the power line, demodulating and obtaining the clock offset time, and correcting the local time according to the clock offset time.
Specifically, after determining the clock offset time, the master playback device outputs the clock offset time to the slave playback device through power line modulation, and the slave playback device corrects the current local time according to the clock offset time, as shown in fig. 3, for example, when the master playback device sends the request message at T1 equal to 101, and the slave playback device receives the request message at T2 equal to 106, then the slave playback device outputs the clock offset time to the slave playback device according to T2ms1＝T2-T1＝Tdey+ Δ T, Tms1 equals 5, the slave playback device sends a response message at a time T3 equals 111, and the master playback device receives a response message at a time T108, based on Tms2＝T4-T3＝TdeyTms2 equals-3, knowing TdeyEqual to 1 and equal to 4, the slave playing device corrects the local time after receiving the absolute offset time at the time point T2, namely the corrected time T2 is (106-4) is 102, and the master playing device delays the time TdeyThe delayed time T1 is 101+ 1-102, so that the master and slave playback devices achieve clock synchronization.
Step S240, obtaining the audio signal, determining the playing time, and playing the audio signal according to the playing time.
The slave playing device may obtain the audio signal from other playing devices, or may obtain the audio signal from an external device.
Specifically, when the other playback device transmits the audio signal to the slave playback device, at this time, the slave playback device acquires the audio signal, and determining the playback time includes: a power carrier signal containing an audio signal is received from a power line. And analyzing the power carrier signal containing the audio signal, acquiring the audio signal, and determining the playing time from the audio signal. The audio signal carries a playing time.
That is to say, after receiving the power carrier signal containing the audio signal from the power line from the playing device, the slave playing device demodulates the power carrier signal, so as to obtain the audio signal, where the audio signal carries the playing time, and the audio signal can be analyzed to obtain the playing time. And playing the audio signal after the playing time is reached.
When the slave playing device acquires the audio signal from the external device, the slave playing device needs to send the acquired audio signal to other playing devices, and at this time, the slave playing device acquires the audio signal, and determining the playing time includes: and acquiring the audio signal and the playing time from the external equipment from the playing equipment. After the slave playing device determines the playing time, the following step is also executed, namely the slave playing device adds the playing time to the audio signal and sends the audio signal to other playing devices through the power line
That is, the audio signal to be played is acquired from the external device from the playback device. When the external device gives the play time, the slave play device may determine the play time given by the external device as the play time. When the external device does not give the play time, the play time may be determined according to a preset rule. For example, the preset rule is: playing after 1 minute after receiving the audio signal, or other rules, which are not limited by the present invention. After the playing time is determined by the slave playing device, the determined playing time is added to the audio signal, the audio signal is modulated into a power carrier signal and is transmitted to other playing devices through the power line, so that the other playing devices can acquire the audio signal from the power line, and the audio signal is played after the playing time is reached. The slave playing device plays the audio signal after reaching the playing time, and realizes the synchronous playing of the audio signal.
As shown in fig. 8, in a further embodiment, the periodically receiving, through power line demodulation, a power carrier signal including request information from a playback device, and outputting response information correspondingly, where the response information carrying request information receiving time and response information sending time specifically includes:
step S211, the slave playback device receives the power carrier signal containing the request information periodically sent by the master playback device through the power line.
Specifically, the slave playback device is connected to the master playback device through the power line and is always in a state to be received, the master playback device periodically sends out a power carrier signal containing the request information to the power line, and the slave playback device receives the power carrier signal from the power line and demodulates the power carrier signal.
Step S212, demodulating the power carrier signal sent from the main playback device to obtain the request information, and recording the receiving time of the request information.
Specifically, as time goes by, the slave playback device corrects the local clock, and the local clock is out of synchronization with the master playback device again due to the problem of the clock speed, so that the slave playback device needs to periodically receive the request information through the power line to realize continuous communication with the master playback device, demodulate and process the request information, and record the receiving time of the request information.
And step S213, correspondingly outputting response information according to the request information, and recording the sending time of the response information.
When the slave playing device keeps communicating with the master playing device continuously, the slave playing device correspondingly outputs response information according to request information sent by the master playing device so as to represent normal communication, meanwhile, the slave playing device records the sending time of the response information and stores the sending time of the response information and the receiving time of the request information in the response information, and therefore the master playing device can know the receiving time of the request information and the sending time of the response information according to the response information.
As shown in fig. 9, the present invention further provides an audio synchronization system, which includes a master playback device and at least one slave playback device, where the master playback device is connected to the at least one slave playback device through a power line.
It should be noted that the playing device may be a device with a sound generating device, such as an active sound box, a passive sound box, a speaker, or a loudspeaker, which has a function of sending an audio signal to the audio conversion device, and is not limited herein.
Furthermore, one or more slave playing devices can be selected according to actual installation sites. The invention transmits the audio signal by the way of power line carrier, can effectively reduce the number of audio transmission cables, improves the reliability of the audio synchronization system, and can realize the extension of the sound channel only by connecting the slave playing equipment to be installed with the power line when the sound channel is required to be extended.
The main playing device is used for realizing the device for describing the audio synchronization method of the main playing device, when the main playing device works, the main playing device sends a power carrier signal and/or an audio signal containing request information, receives the power carrier signal containing response information, records the sending time of the request information and the receiving time of the response information, and simultaneously obtains the receiving time of the request information and the sending time of the response information, thereby determining the one-way delay time and the clock offset time between the main playing device and the slave playing device according to four time points, the main playing device receives the audio signal sent by the external device and transmits the audio signal to each slave playing device through a power line.
The slave playing device demodulates the clock offset time and/or the audio signal from the power line, corrects respective local time according to the clock offset time, the corrected time is consistent with the time of the master playing device after the unidirectional delay time, and simultaneously outputs the audio signal after the playing time is reached, thereby realizing the synchronous output of the audio signal.
As shown in fig. 10, in an embodiment of the audio synchronization system of the present invention, the main player device includes a first modem 11, a first controller 12 and a first player 13, one end of the first modem 11 is connected to the power line, the other end is connected to the first controller 12, and the first controller 12 is further connected to the first player 13.
Specifically, the first modem 11 is configured to modulate and output a received signal or demodulate the received signal to implement conversion of a digital-to-analog signal, and the first controller 12 is configured to receive an audio signal, send request information and receive response information, record a request information sending time and a response information receiving time, determine a one-way delay time and a clock offset time between the master playback device and the slave playback device according to a preset algorithm, and control the first player 13 to play the received audio signal after delaying the one-way delay time.
As shown in fig. 11, in another embodiment of the audio synchronization system of the present invention, the slave playback device includes a second modem 21, a second controller 22 and a second player 23, as shown in fig. 11, one end of the second modem 21 is connected to the power line, the other end is connected to the second controller 22, and the second controller 22 is further connected to the second player 23.
The second modem 21 is used for modulating the received signal and demodulating the output signal from the power line, the second controller 22 is used for receiving the request information and sending the response information, recording the receiving time of the request information and the sending time of the response information, meanwhile, the time information is stored in the response information and sent to the first controller 12 in the main playing device, the audio signal to be played is sent to the second modem 21 by the main playing device through the power line, the second modem 21 demodulates the audio signal and sends the audio signal to the second controller 22, and the second controller 22 outputs the audio signal to the second player 23 after correcting the local time of the second controller 22, so that the audio synchronous output is realized.
The working principle of the audio synchronization system of the present invention is described below with reference to fig. 1 to 11:
first, the first controller 12 of the master playback device 10 interactively communicates with the second controller 22 of at least one slave playback device, determines a clock offset time with the slave playback device, and receives an audio signal through the first controller 12. Then, the clock offset time and the audio signal are modulated and output to the power line through the first modem 11 of the main playback device 10.
Next, the clock offset time and the audio signal are demodulated from the power line from the second modem 21 of the playback device.
Finally, the second controller 22 of the slave playing device determines the playing time according to the clock offset time, and synchronously plays the audio signal through the second player 23 after the playing time is up, and simultaneously the first controller 12 of the master playing device controls the first player 13 to play the audio signal after the one-way delay time is delayed. The audio synchronization system transmits audio signals through the power line carrier, simplifies the circuit structure of the sound system, facilitates the expansion and upgrade of the sound system, and realizes the synchronous sound production of the playing devices of the audio synchronization system by the interactive communication between the main playing device and at least one slave playing device on the basis of the power line carrier.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (13)
1. The audio synchronization method is applied to an audio synchronization system, wherein the audio synchronization system comprises a master playing device and at least one slave playing device, and the master playing device is connected with the at least one slave playing device through a power line; the audio synchronization method comprises the following steps:
the master playing device periodically outputs a power carrier signal containing request information to the at least one slave playing device through the power line;
receiving the power carrier signal containing the response information output by the at least one slave playing device through the power line, and demodulating to obtain the response information, wherein the response information carries the request information receiving time and the response information sending time of the corresponding slave playing device;
determining the one-way delay time and the clock offset time of the master playing device and the at least one slave playing device according to the sending and receiving time of the request information, the sending and receiving time of the response information and a preset formula, wherein the preset formula is as follows:
wherein, T1 is the time of request message transmission, T2 is the time of request message reception, T3 is the time of response message transmission, T4 is the time of response message reception, Δ T is the clock offset time, TdeyIs a one-way delay time;
the master playing device modulates and outputs a power carrier signal containing the clock offset time to a corresponding slave playing device so that the slave playing device corrects local time according to the clock offset time;
the main playing device acquires the audio signal, determines the playing time and plays the audio signal according to the playing time.
2. The audio synchronization method of claim 1, wherein the master playback device obtains an audio signal and determining the playback time comprises:
receiving a power carrier signal containing the audio signal from the power line; wherein, the audio signal carries playing time;
and analyzing the power carrier signal containing the audio signal, acquiring the audio signal, and determining the playing time from the audio signal.
3. The audio synchronization method of claim 1, wherein the main playback device obtains an audio signal, determines a playback time, and plays back the audio signal according to the playback time comprises:
the master playing device acquires the audio signals from the external device and determines the playing time of the audio signals according to the one-way delay time of each slave playing device;
the master playing device sends an audio signal carrying playing time to the slave playing device through the power line;
and when the main playing equipment reaches the playing time, playing the audio signal.
4. The audio synchronization method according to claim 1, wherein the periodically outputting, by the master playback device, a power carrier signal containing request information to the at least one slave playback device via the power line specifically comprises:
the main playing device periodically generates request information;
modulating the request information into a power carrier signal;
and transmitting the power carrier signal to the at least one slave playing device through a power line, and recording the transmission time of the power carrier signal, wherein the transmission time of the power carrier signal is taken as the transmission time of the request information.
5. The audio synchronization method according to claim 4, wherein the receiving, via the power line, the at least one power carrier signal output from the playback device and containing the response information, and demodulating to obtain the response information specifically includes:
the main playing device receives the power carrier signal containing the response information output by the at least one slave playing device through the power line;
and demodulating the at least one power carrier signal output from the playing equipment to obtain the response information, and recording the receiving time of the response information.
6. The audio synchronization method according to claim 5, wherein the determining the one-way delay time and the clock offset time of the master playback device and the at least one slave playback device according to the sending and receiving time of the request message and the sending and receiving time of the response message specifically comprises:
determining a first deviation time according to the sending time and the receiving time of the request information;
determining a second deviation time according to the sending time and the receiving time of the response information;
and determining the one-way delay time and the clock offset time of the master playing device and the at least one slave playing device according to the first deviation time and the second deviation time.
7. The audio synchronization method is applied to an audio synchronization system, wherein the audio synchronization system comprises a master playing device and at least one slave playing device, and the master playing device is connected with the at least one slave playing device through a power line; the audio synchronization method comprises the following steps:
the slave playing device receives a power line carrier signal which is periodically sent by the master playing device and contains request information through the power line, and correspondingly outputs response information, wherein the response information carries request information receiving time and response information sending time;
and outputting a power carrier signal containing response information to the master playing device through the power line modulation, so that the master playing device determines the one-way delay time and the clock offset time of the master playing device and the slave playing device according to the sending and receiving time of the request information, the sending and receiving time of the response information and a preset formula, wherein the preset formula is as follows:
wherein, T1 is the time of request message transmission, T2 is the time of request message reception, T3 is the time of response message transmission, T4 is the time of response message reception, Δ T is the clock offset time, TdeyIs a one-way delay time;
receiving a power line carrier signal containing the clock offset time through the power line, demodulating and acquiring the clock offset time, and correcting local time according to the clock offset time;
acquiring an audio signal, determining playing time, and playing the audio signal according to the playing time.
8. The method of claim 7, wherein the obtaining the audio signal and determining the playing time comprises:
receiving a power carrier signal containing an audio signal from a power line;
analyzing the power carrier signal to obtain the audio signal; the audio signal carries playing time;
the playing time is determined in the audio signal.
9. The method of claim 7, wherein the obtaining the audio signal and determining the playing time comprises:
acquiring an audio signal and playing time from external equipment;
after the determining the playing time, further comprising:
and adding the playing time to the audio signal, and sending the audio signal to other playing equipment through the power line.
10. The audio synchronization method according to claim 7, wherein the slave playback device periodically receives, through the power line demodulation, a power carrier signal containing request information, and correspondingly outputs response information, and the response information carrying a request information receiving time and a response information sending time specifically includes:
the slave playing device receives a power line carrier signal which is periodically sent by the master playing device and contains request information through the power line;
demodulating and obtaining request information from the power carrier signal sent by the main playing device, and recording the receiving time of the request information;
and correspondingly outputting response information according to the request information, and recording the sending time of the response information.
11. The audio synchronization system is characterized by comprising a main playing device and at least one slave playing device, wherein the main playing device is connected with the at least one slave playing device through a power line; wherein the content of the first and second substances,
the main playback device is a device for executing the audio synchronization method according to any one of the preceding claims 1 to 6;
the slave playback apparatus is an apparatus that performs the audio synchronization method according to any one of claims 7 to 10.
12. The audio synchronization system of claim 11, wherein the master playback device comprises a first modem, a first controller, and a first player; one end of the first modem is connected with the power line, the other end of the first modem is connected with the first controller, and the first controller is further connected with the first player.
13. The audio synchronization system of claim 11, wherein the slave playback device comprises a second modem, a second controller, and a second player; one end of the second modem is connected with the power line, the other end of the second modem is connected with the second controller, and the second controller is further connected with the second player.
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| CN111355996A (en) * | 2018-12-20 | 2020-06-30 | 海信视像科技股份有限公司 | Audio playing method and computing device |
| US11190836B2 (en) | 2018-12-20 | 2021-11-30 | Hisense Visual Technology Co., Ltd. | Audio playing and transmitting methods and apparatuses |
| CN112714384B (en) * | 2019-10-24 | 2022-05-20 | 北京小米移动软件有限公司 | Stereo output control device and method, electronic apparatus, and storage medium |
| CN111147907B (en) * | 2019-12-26 | 2022-05-10 | 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 |
| TWI750565B (en) * | 2020-01-15 | 2021-12-21 | 原相科技股份有限公司 | True wireless multichannel-speakers device and multiple sound sources voicing method thereof |
| CN111343620A (en) * | 2020-02-28 | 2020-06-26 | 捷开通讯(深圳)有限公司 | Multi-device audio playing correction method, device and terminal |
| 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 |
| CN113300797B (en) * | 2021-03-29 | 2022-09-16 | 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 |
| CN116368809A (en) * | 2021-10-27 | 2023-06-30 | 京东方科技集团股份有限公司 | Audio and video synchronization method and device, storage medium and electronic equipment |
| CN114339294B (en) * | 2022-01-04 | 2023-02-10 | 腾讯科技（深圳）有限公司 | Method, device and equipment for confirming network jitter and storage medium |
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