CN114495874A - Audio data synchronization system, control method thereof and chorus system - Google Patents
Audio data synchronization system, control method thereof and chorus system Download PDFInfo
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- 241001342895 Chorus Species 0.000 title claims abstract description 31
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- G10H1/00—Details of electrophonic musical instruments
- G10H1/36—Accompaniment arrangements
- G10H1/361—Recording/reproducing of accompaniment for use with an external source, e.g. karaoke systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
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Abstract
The application relates to an audio data synchronization system, a control method thereof and a chorus system, wherein the audio data synchronization system comprises: the control device and the modulation and demodulation cards are respectively connected with the audio devices; the control equipment is used for establishing communication connection between at least two modulation and demodulation cards and carrying out data interaction between the modulation and demodulation cards through a data frame with a set frame format; the data frame comprises an uplink data frame and a downlink data frame; the modulation and demodulation card is used for demodulating a clock signal and audio data from the downlink data frame, transmitting the clock signal and the audio data to the audio equipment, modulating uplink data sent by the audio equipment into an uplink data frame, and sending the uplink data frame to the control equipment; the audio equipment is used for acquiring synchronous information according to the clock signal, carrying out synchronous processing on corresponding audio data according to the synchronous information and sending uplink data to the modulation and demodulation card; according to the technical scheme, the accurate synchronization between the audio data can be accurately realized through the clock signal, and the chorus sound effect is improved.
Description
Technical Field
The application relates to the technical field of audio processing, in particular to an audio data synchronization system, a control method thereof and a chorus system.
Background
In the life of people, audio synchronization technology is used in many scenes, such as activity, meeting sites, KTV rooms and other scenes; when the on-site sound of the activity conference needs to be synthesized, the audio data is remotely transmitted and synthesized, the karaoke singing is performed and the like, the audio sources are simultaneously received and synchronously synthesized by the plurality of audio devices, and in the process, the time deviation among the participants in the synthesis process needs to be accurately controlled, so that the synchronization effect can be ensured.
At present, in the real-time chorus application of a plurality of KTV rooms, the chorus hosts of all the rooms are interconnected through a local area network/internet, and then chorus audio data are synchronized and synthesized through corresponding background software.
Disclosure of Invention
In order to solve one of the above technical defects, the present application provides an audio data synchronization system, a control method thereof, and a chorus system, so as to achieve accurate synchronization of audio data.
An audio data synchronization system comprising: the control device and the modulation and demodulation cards are respectively connected with the audio devices; the control equipment is physically connected with each modem card through a serial link;
the control equipment is used for establishing communication connection between at least two modulation and demodulation cards and carrying out data interaction between the modulation and demodulation cards through a data frame with a set frame format; wherein the data frame comprises an uplink data frame and a downlink data frame;
the modulation and demodulation card is used for demodulating a clock signal and audio data from a downlink data frame and transmitting the clock signal and the audio data to the audio equipment, and modulating uplink data sent by the audio equipment into an uplink data frame and sending the uplink data to the control equipment;
and the audio equipment is used for acquiring synchronous information according to the clock signal, carrying out synchronous processing on corresponding audio data according to the synchronous information and sending uplink data to the modulation and demodulation card.
In one embodiment, the modem card is provided with a plurality of registers, including:
a bit indication register for indicating whether the audio device is in bit; wherein each of the audio devices indicates a network status through the register;
the on-line operation register is used for indicating that the current audio equipment needs to be connected with other audio equipment; when the audio equipment needs to be connected with other audio equipment, the required audio equipment is represented by the register;
the address register is used for representing the logical address of the modem card of the audio equipment which needs to be connected with the modem cards of other audio equipment; after the audio equipment initiates a connection operation, the control equipment sends a logical address required to be connected to the register;
and a status register for marking an execution operation status and/or an abnormal status of the modem card of the audio device.
In one embodiment, the control device polls the indication state of the in-place indication register of the modem card of each audio device, and acquires the network state of each audio device according to the indication state;
the control equipment polls the indication state of the on-line operation register of the modulation and demodulation card of each audio equipment and determines whether the audio equipment needs to establish connection with other audio equipment according to the indication state;
the control equipment inquires a logic address of an address register of a modulation and demodulation card of the audio equipment and establishes connection between the audio equipment and other audio equipment according to the logic address;
the control equipment inquires the indication state of a state register of a modulation and demodulation card of the audio equipment and acquires whether the operation of the audio equipment on the downlink control information is successful or acquires the abnormal information of the audio equipment on a link according to the indication state.
In one embodiment, the downlink data frame structure includes: the system comprises an SCF field and a downlink data field, wherein the SCF field is used for writing frame synchronization information or transmitting downlink control information sent by control equipment;
the uplink data frame includes: the system comprises an SRF field and an uplink data field, wherein the SRF field is used for writing a synchronous frame header or transmitting uplink control information sent by a modulation and demodulation card.
In one embodiment, the control device is connected with each modem card through an unshielded twisted pair; wherein the control device feeds power into the unshielded twisted pair, and each modem card extracts power from the unshielded twisted pair.
In one embodiment, the audio device and modem card communicate over an I2C interface; the control device and the modem card communicate via a TDM data bus.
An audio data synchronization control method is applied to the audio data synchronization system, and the method includes:
the control equipment polls an in-place indication register of a modulation and demodulation card of each audio equipment, and when the audio equipment is in place, a logic address is distributed to the modulation and demodulation card of the audio equipment;
the control equipment polls the on-line operation register of the modulation and demodulation card of each audio equipment to obtain the audio equipment needing interconnection;
the control equipment acquires the logic addresses distributed by the interconnected audio equipment and establishes communication connection between corresponding modulation and demodulation cards according to the logic addresses;
and the control equipment allocates idle time slot resources to the interconnected audio equipment and controls the modem cards of the interconnected audio equipment to perform data interaction by using the data frames based on the time slot resources.
In one embodiment, the audio data synchronization control method further includes:
after the audio equipment is powered on, informing the modem card that the current audio equipment state is normal; the modulation and demodulation card writes in-place indication information on an in-place indication register; the control equipment sends the audio equipment in place and the logical address thereof to each audio equipment.
In one embodiment, the audio data synchronization control method further includes:
the method comprises the steps that a first audio device obtains a second audio device which is selected by a user and interconnected, and sends a connection instruction to a corresponding first modulation and demodulation card;
the first modem card sets the on-line operation register to be in a connection state, and writes the logic address of the second modem card into the address register;
wherein the interconnected audio devices comprise: a first audio device of the initiator and a second audio device of the recipient; the first audio equipment is correspondingly connected with a first modulation and demodulation card, and the second audio equipment is correspondingly connected with the first modulation and demodulation card and correspondingly connected with a second modulation and demodulation card.
A chorus system comprising: audio equipment arranged in each room, and the audio data synchronization system.
The audio data synchronization system, the control method thereof and the chorus system are characterized in that the control device and the modulation and demodulation cards which are respectively connected with the audio devices are connected with each other through a serial link in a physical mode; data interaction is carried out between the modulation and demodulation cards by designing a data frame with a set frame format, a clock signal is transmitted by using a serial link, and the modulation and demodulation cards demodulate the clock signal and transmit audio data; according to the technical scheme, the accurate synchronization between the audio data can be accurately realized through the clock signal, the chorus sound effect is improved, the user can obtain the experience of chorus on the same occasion, and the great improvement is immersed.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an audio data synchronization system according to an embodiment;
FIG. 2 is a data frame structure diagram of one embodiment;
FIG. 3 is a flow diagram of an audio data synchronization control method of an embodiment;
FIG. 4 is a flowchart of the operation of an exemplary control device and modem card;
fig. 5 is a timing diagram of the operation of the chorus system.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and are not construed as limiting the present application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, or operations, but do not preclude the presence or addition of one or more other features, integers, steps, operations, or groups thereof.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an audio data synchronization system according to an embodiment, and the audio data synchronization system of the present application may include: audio equipment and an audio data synchronization system provided in each room. In the audio data synchronization system, as shown, it can be applied to a scenario of chorus synchronization among a plurality of KTV rooms, audio devices (such as KTV jukeboxes, computers, etc.) among different rooms can check whether users of the respective rooms are in place through UI interfaces, then select one of the in-place audio devices to initiate interconnection, and keep synchronization and composition of corresponding data transmission during interconnection.
With continuing reference to fig. 1, fig. 1 shows a topological diagram of an audio data synchronization system, which, as shown in the figure, takes chorus among a plurality of rooms as an example, and applies the technical solution provided by the present application to audio devices in the respective rooms, the audio data synchronization system includes: the control device and the modulation and demodulation cards are respectively connected with the audio devices; as audio equipment 1-n in the figure, a modulation and demodulation card 1-n, wherein n is more than or equal to 2; the control equipment is physically connected with each modulation and demodulation card through a serial link. As an embodiment, the control device is connected with each modem card through an unshielded twisted pair; wherein the control device feeds power into the unshielded twisted pair, and each modem card extracts power from the unshielded twisted pair. Preferably, the audio device and modem card communicate via an I2C interface; the control device and the modem card communicate over a TDM data bus.
As shown in the figure, the control device is connected in series with each modem card, and each modem card can process data sent to itself and forward other data to the next modem card.
According to the system, the control equipment is used for establishing communication connection between at least two modulation and demodulation cards and carrying out data interaction between the modulation and demodulation cards through the data frames with the set frame format; the data frame comprises an uplink data frame and a downlink data frame; the modulation and demodulation card is used for demodulating a clock signal and audio data from the downlink data frame, transmitting the clock signal and the audio data to the audio equipment, modulating uplink data sent by the audio equipment into an uplink data frame, and sending the uplink data frame to the control equipment; the audio equipment is used for acquiring the synchronous information according to the clock signal, carrying out synchronous processing on corresponding audio data according to the synchronous information and sending the uplink data to the modulation and demodulation card.
Based on the scheme of the embodiment, the control equipment is physically connected with each modulation and demodulation card through a serial link through the control equipment and the modulation and demodulation cards respectively connected with each audio equipment; data interaction is carried out between the modulation and demodulation cards by designing a data frame with a set frame format, a clock signal is transmitted by using a serial link, and the modulation and demodulation cards demodulate the clock signal and transmit audio data; according to the technical scheme, the accurate synchronization between the audio data can be accurately realized through the clock signal, the chorus sound effect is improved, the user can obtain the experience of chorus on the same occasion, and the great improvement is immersed.
In one embodiment, in order to facilitate monitoring and controlling of each modem card, the present application further sets a plurality of registers on each modem card, where the specific registers include the following:
a bit indication register for indicating whether the audio device is in bit; wherein each audio device indicates a network status via the register;
the on-line operation register is used for indicating that the current audio equipment needs to be connected with other audio equipment; when the audio equipment needs to be connected with other audio equipment, the required audio equipment is represented by the register;
the address register is used for representing the logical address of the modem card of the audio equipment which needs to be connected with the modem cards of other audio equipment; after the audio equipment initiates a connection operation, the control equipment sends a logic address required to be connected to the register;
and a status register for marking an execution operation status and/or an abnormal status of a modem card of the audio apparatus.
In one embodiment, the control device polls the indication state of the in-place indication register of the modem card of each audio device, and acquires the network state of each audio device according to the indication state;
the control equipment polls the indication state of the on-line operation register of the modulation and demodulation card of each audio equipment and determines whether the audio equipment needs to establish connection with other audio equipment according to the indication state;
the control equipment inquires the logic address of an address register of a modulation and demodulation card of the audio equipment and establishes connection between the audio equipment and other audio equipment according to the logic address;
the control equipment inquires the indication state of the state register of the modulation and demodulation card of the audio equipment and acquires whether the operation of the audio equipment on the downlink control information is successful or acquires the abnormal information of the audio equipment on a link according to the indication state.
The register provided in the above embodiment can facilitate the control device to perform real-time monitoring on each audio device, and can implement functions of in-place detection, logical address configuration, device interconnection, and status indication according to the monitoring register.
For facilitating data transmission, the present application provides a data frame with a set frame format, and fig. 2 is a schematic diagram of a data frame structure according to an embodiment; in one embodiment, the downlink data frame structure includes: SCF field and downlink data field, wherein, SCF field is used to write frame synchronization information or transmit downlink control information sent by control device; the uplink data frame includes: the SRF field is used for writing a synchronous frame header or transmitting uplink control information sent by a modulation and demodulation card.
Based on the data frame structure, the modem card of each audio device can acquire the sampling rate through the SCF, and the data of the modem card can be set through the control information stream attached to the SCF, so that the modem card can determine which data is data of itself and which data is data to be forwarded to the modem card of the next stage.
In the frame structure illustrated above, a super frame may include SCF and downlink data, SRF and uplink data, which are 1024 bits in total, where the audio data is 816 bits, and the others are frame synchronization information and control information such as SCF/SRF; each sample point data is put into a superframe and the data transmission process may use the I2S protocol.
For example, if the sampling rate is 48KHz, then 48 superframes are transmitted in 1s, and the data transmission rate on the link is 48 × 1024 — 49.152 MHz; similarly, if the sampling rate is 44.1KHz, the data transmission rate on the link is 44.1KHz 1024-45.1584 MHz.
By integrating the technical schemes of the above embodiments, the modem card can realize accurate synchronization of the transmission data lines by demodulating frame synchronization information, so that the audio data can be accurately synchronized and synthesized during the chorus process of the audio device; in the technical scheme, the unshielded twisted pair is adopted for connection, thereby connecting lines between the devices can be simplified, the cost and complexity of the devices are reduced, the power is transmitted through the unshielded twisted pair, each modem card does not need to be additionally provided with power equipment, the devices are further simplified, the control device transmits clock signals and audio data through data frames in a set frame format, each modem card can provide accurate synchronous reference information for the audio equipment through the demodulated clock signals, the data synchronization between the interconnected audio equipment is ensured, thereby providing high-quality technical support for the chorus of a user, the chorus sound effect is improved, the user can obtain the experience of chorus on the same occasion, and the immersion is greatly improved.
Based on the technical solution of the foregoing embodiment, the present application further provides an audio data synchronization control method, as shown in fig. 3, where fig. 3 is a flowchart of the audio data synchronization control method of an embodiment, and the method mainly includes:
and S1, the control device polls the bit indication register of the modem card of each audio device, and when the audio device is in bit, the control device allocates a logic address to the modem card of the audio device.
And S2, the control device polls the on-line operation register of the modem card of each audio device to obtain the audio devices to be interconnected.
And S3, the control device acquires the logic address assigned by the interconnected audio devices and establishes the communication connection between the corresponding modem cards according to the logic address.
And S4, the control device allocates idle time slot resources to the interconnected audio devices, and controls the modem cards of the interconnected audio devices to perform data interaction by using the data frames based on the time slot resources.
According to the scheme of the embodiment, the control equipment polls the state of each modem card based on the use of the register, so that each audio device can be monitored in real time.
In an embodiment, the audio data synchronization control method of the present application may further notify the modem card that the current state of the audio device is normal after the audio device is powered on; the modulation and demodulation card writes in-place indication information on an in-place indication register; and the control equipment sends the audio equipment currently in place and the logical address thereof to each audio equipment.
Further, take the example that the interconnected audio devices include a first audio device of the initiator and a second audio device of the recipient; the first audio equipment is correspondingly connected with the first modulation and demodulation card, and the second audio equipment is correspondingly connected with the first modulation and demodulation card and the second modulation and demodulation card.
The audio data synchronization control method of the application can further comprise the following steps: the first audio equipment acquires the interconnected second audio equipment selected by the user and sends a connection instruction to the corresponding first modulation and demodulation card; the first modem card sets the on-line operation register to be in a connection state, and writes the logic address of the second modem card in the address register.
In the solution of the above embodiment, each audio device and the modem card may perform control information interaction through an I2C interface, after the audio device is powered on and operated, send a notification message to the connected modem card to notify that the audio device is currently in place, the modem card indicates the notification message through the in-place indication register, the control device periodically polls the in-place indication register of each modem card, if it is found that the audio device is in the in-place state, the control device assigns a logical address to the modem card, the logical address of each audio device is issued to each audio device, the user may know which audio devices are in the in-place state through the audio devices, so as to select one audio device to interconnect, the control device polls the on-line operation register, if it is described as the connection state, and reading the assigned address operation register, and adding the audio equipment needing interconnection to the TDM data bus to complete the on-line operation. If the connection is disconnected, the audio equipment connected with the TDM data bus is deleted, and the disconnection operation is completed.
Referring to fig. 4, fig. 4 is a flowchart illustrating the operation of an exemplary control device and modem card, and taking the interconnection of a first audio device in room 1 and a second audio device in room 2 as an example, the main flow for the control device may be as follows:
and s101, controlling the equipment to be powered on and started.
And s102, polling the in-place indication registers of the modem cards of the audio equipment in each room, if the first audio equipment in the room 1 is in place, executing s103, otherwise, polling according to a preset period.
s103, a logical address is assigned to the first audio device of room 1.
And s104, polling the on-line operation register of the modem card of each audio device to acquire the second audio device of the room 2 to be interconnected.
And s105, inquiring the logical addresses of the interconnected first audio equipment and second audio equipment to connect.
s106, allocating idle time slot resources for the room 1 and the room 2, and then performing data transmission by using data frames; the first modulation and demodulation card and the second modulation and demodulation card can demodulate a clock signal from a downlink data frame to obtain audio data according to frame synchronization downlink, or modulate the audio data to be uploaded to an uplink data frame to upload, thereby realizing the data interaction and synchronization control process.
As shown in fig. 4, for the workflow of the audio device and its connected modem card, the workflow for the first audio device of room 1 may be as follows:
s201, the first audio device of room 1 is powered on.
And s202, the first audio equipment is powered on normally.
s203, the first audio device informs the first modem card that the current status is normal.
s204, the first modem card is set in the bit indication register.
Based on the above procedure, the audio devices of all the existing rooms can be delivered to each room, so that the audio devices of all the rooms can see that the room 1 is online and can be interconnected with other rooms.
s301, the user of room 2 selects room 1 and initiates the interconnection.
And s302, clicking the connection by the user, and initiating the connection operation.
s303, the second audio device in room 2 sends a notification message to the second modem card, setting the on-hook operation register to a connected state.
s304, the logical address of room 1 is put into the address register.
After the above procedure, the control device may poll the connection request to the room 2 and the logical address of the room 1 to be connected, so that the interconnection of the rooms 1 and 2 may be established according to the logical address.
Embodiments of the chorus system of the present application are further set forth below.
The chorus system of the present application, based on the hardware transmission mechanism of the audio data synchronization system provided by the above embodiments and the basic implementation of the related control method thereof, can implement a chorus function performed by multiple users on different audio devices, as shown in fig. 5, fig. 5 is a working sequence diagram of the chorus system, as shown in the figure, when multiple audio devices need to perform chorus, the figure takes a first audio device and a second audio device as examples, and the main flow is as follows:
1) the control device sends a "prepare" instruction to the respective audio devices.
2) After each audio device receives the preparation instruction, the resource data preparation operation is executed, wherein the resource data preparation operation comprises music resource loading, audio and video data pre-decoding and the like.
3) When the respective audio device is ready, a "ready" notification is sent to the control device.
4) After receiving the ready notification from all audio devices, the control device sends a start command to each audio device.
5) When each audio device receives the 'start' instruction, the audio device immediately enters a chorus state and plays the ready data resource.
Based on the chorus system that this application provided, can realize the accurate synchronization between the audio data through the clock signal accuracy, promote the sound effect of chorus, the user can obtain the experience of chorus with the scene, and very big promotion is immersed and is felt.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. An audio data synchronization system, comprising: the control device and the modulation and demodulation cards are respectively connected with the audio devices; the control equipment is physically connected with each modem card through a serial link;
the control equipment is used for establishing communication connection between at least two modulation and demodulation cards and carrying out data interaction between the modulation and demodulation cards through a data frame with a set frame format; wherein the data frame comprises an uplink data frame and a downlink data frame;
the modulation and demodulation card is used for demodulating a clock signal and audio data from a downlink data frame and transmitting the clock signal and the audio data to the audio equipment, and modulating uplink data sent by the audio equipment into an uplink data frame and sending the uplink data to the control equipment;
the audio equipment is used for acquiring synchronous information according to the clock signal, carrying out synchronous processing on corresponding audio data according to the synchronous information, and sending uplink data to the modulation and demodulation card.
2. The audio data synchronization system of claim 1, wherein the modem card is provided with a plurality of registers, comprising:
a bit indication register for indicating whether the audio device is in bit; wherein each of the audio devices indicates a network status through the register;
the on-line operation register is used for indicating that the current audio equipment needs to be connected with other audio equipment; when the audio equipment needs to be connected with other audio equipment, the required audio equipment is represented by the register;
the address register is used for representing the logical address of the modem card of the audio equipment which needs to be connected with the modem cards of other audio equipment; after the audio equipment initiates a connection operation, the control equipment sends a logical address required to be connected to the register;
and a status register for marking an execution operation status and/or an abnormal status of the modem card of the audio device.
3. The audio data synchronization system according to claim 2, wherein the control device polls the indication status of the in-place indication register of the modem card of each audio device and acquires the network status of each audio device according to the indication status;
the control equipment polls the indication state of the on-line operation register of the modulation and demodulation card of each audio equipment and determines whether the audio equipment needs to establish connection with other audio equipment according to the indication state;
the control equipment inquires a logic address of an address register of a modulation and demodulation card of the audio equipment and establishes connection between the audio equipment and other audio equipment according to the logic address;
the control equipment inquires the indication state of a state register of a modulation and demodulation card of the audio equipment and acquires whether the operation of the audio equipment on the downlink control information is successful or acquires the abnormal information of the audio equipment on a link according to the indication state.
4. The audio data synchronization system of claim 1, wherein the downstream data frame structure comprises: the system comprises an SCF field and a downlink data field, wherein the SCF field is used for writing frame synchronization information or transmitting downlink control information sent by control equipment;
the uplink data frame includes: the system comprises an SRF field and an uplink data field, wherein the SRF field is used for writing a synchronous frame header or transmitting uplink control information sent by a modulation and demodulation card.
5. The audio data synchronization system according to claim 1, wherein the control device is connected to each modem card through an unshielded twisted pair cable; wherein the control device feeds power to the unshielded twisted pair line, each modem card extracting power from the unshielded twisted pair line.
6. The audio data synchronization system of claim 5, wherein the audio device and modem card communicate over an I2C interface; the control device and the modem card communicate via a TDM data bus.
7. An audio data synchronization control method applied to the audio data synchronization system according to any one of claims 2 to 6, the method comprising:
the control equipment polls an in-place indication register of a modulation and demodulation card of each audio equipment, and when the audio equipment is in place, a logic address is distributed to the modulation and demodulation card of the audio equipment;
the control equipment polls the on-line operation register of the modulation and demodulation card of each audio equipment to obtain the audio equipment needing interconnection;
the control equipment acquires the logic addresses distributed by the interconnected audio equipment and establishes communication connection between corresponding modulation and demodulation cards according to the logic addresses;
and the control equipment allocates idle time slot resources to the interconnected audio equipment and controls the modem cards of the interconnected audio equipment to perform data interaction by using the data frames based on the time slot resources.
8. The audio data synchronization control method according to claim 7, further comprising:
after the audio equipment is powered on, informing the modem card that the current audio equipment state is normal; the modem card writes in the bit indication information in the bit indication register; and the control equipment sends the audio equipment currently in place and the logical address thereof to each audio equipment.
9. The audio data synchronization control method according to claim 8, further comprising:
the first audio equipment acquires the interconnected second audio equipment selected by the user and sends a connection instruction to the corresponding first modulation and demodulation card;
the first modem card sets the on-line operation register to be in a connection state, and writes the logic address of the second modem card into the address register;
wherein the interconnected audio devices comprise: a first audio device of the initiator and a second audio device of the recipient; the first audio equipment is correspondingly connected with a first modulation and demodulation card, and the second audio equipment is correspondingly connected with the first modulation and demodulation card and correspondingly connected with a second modulation and demodulation card.
10. A chorus system, comprising: audio equipment provided in each room, and the audio data synchronization system according to any one of claims 1 to 6.
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