TWI727899B - Main bluetooth circuit and auxiliary bluetooth circuit of multi-member bluetooth device be capable of synchronizing audio playback between different bluetooth circuits - Google Patents

Abstract

A main Bluetooth circuit and an auxiliary Bluetooth circuit of a multi-member Bluetooth device are disclosed. The multi-member Bluetooth device is utilized for communicating data with a source Bluetooth device, and the source Bluetooth device acts as a master in a first piconet. The main Bluetooth circuit acts as a slave in the first piconet, and acts as a master in a second piconet. The auxiliary Bluetooth circuit acts as a slave in the second piconet. The main Bluetooth circuit generates a first slave clock and a second main clock synchronized with a first main clock generated by the source Bluetooth device, and samples a first audio data to be playback. The auxiliary Bluetooth circuit generates a second slave clock and a third slave clock synchronized with the second main clock, and samples a second audio data to be playback.

Description

The main Bluetooth circuit and the secondary Bluetooth circuit in a multi-member Bluetooth device that can keep the audio playback of different Bluetooth circuits synchronized

The invention relates to Bluetooth technology, in particular to a main Bluetooth circuit and a secondary Bluetooth circuit in a multi-member Bluetooth device that can keep the audio playback of different Bluetooth circuits synchronized.

A multi-member Bluetooth device refers to a Bluetooth device composed of multiple Bluetooth circuits that are used in conjunction with each other, such as a pair of Bluetooth headsets, a group of Bluetooth speakers, and so on. When a multi-member Bluetooth device is connected to another Bluetooth device (hereinafter referred to as a remote Bluetooth device), the remote Bluetooth device treats the multi-member Bluetooth device as a single Bluetooth device.

Many traditional multi-member Bluetooth devices have audio playback capabilities. In many applications, different Bluetooth circuits may play audio data together to create stereo sound effects or surround sound effects. However, if the audio playback operations of different Bluetooth circuits in the multi-member Bluetooth device cannot be synchronized with each other, it will bring a poor user experience to the user, thereby reducing the application value and use flexibility of the multi-member Bluetooth device.

In view of this, how to keep the audio playback of different Bluetooth circuits in a multi-member Bluetooth device synchronized is a problem to be solved.

This specification provides an embodiment of the main Bluetooth circuit in a multi-member Bluetooth device. The multi-member Bluetooth device is used for data transmission with a source Bluetooth device, and includes the master blue A tooth circuit and a Bluetooth circuit. The source Bluetooth device acts as a master device in a first Bluetooth piconet. The main Bluetooth circuit includes: a first Bluetooth communication circuit; a first clock adjustment circuit; a first control circuit, coupled to the first Bluetooth communication circuit and the first clock adjustment circuit, configured to control the main The Bluetooth circuit acts as a slave device in the first Bluetooth piconet and a master device in a second Bluetooth piconet; a first sampling clock adjustment circuit coupled to the first control circuit; and a second An asynchronous sampling rate conversion circuit, coupled to the first sampling clock adjustment circuit, is configured to sample a first audio data according to a first audio sampling clock, and send the sampled data to a first playback circuit Play; wherein, the first control circuit is also configured to perform the following operations: according to the timing data of a first main clock generated by the source Bluetooth device, control the first clock adjustment circuit to generate and the first main time A first slave clock and a second master clock synchronized with the pulse; and controlling the first Bluetooth communication circuit to transmit or receive packets in the first Bluetooth piconet according to the first slave clock, and control the first The Bluetooth communication circuit transmits or receives packets in the second Bluetooth picone based on the second master clock, so that the secondary Bluetooth circuit transmits or receives packets in the second Bluetooth micro network based on a second slave clock synchronized with the second master clock. Send or receive packets in the network.

One of the advantages of the above embodiment is that the master Bluetooth circuit synchronizes its internal first slave clock and second master clock with the first master clock determined by the source Bluetooth device, so the first clock adjustment circuit It can be implemented with a simplified circuit architecture.

Another advantage of the above-mentioned embodiment is that the first slave clock and the second master clock used by the master Bluetooth circuit are synchronized with the first master clock, which can effectively improve the Bluetooth bandwidth utilization efficiency of the master Bluetooth circuit.

This specification also provides an embodiment of a secondary Bluetooth circuit in a multi-member Bluetooth device. The multi-member Bluetooth device is used for data transmission with a source Bluetooth device, and includes a main Bluetooth circuit and the auxiliary Bluetooth circuit. The source Bluetooth device acts as a master device in a first Bluetooth piconet. The master Bluetooth circuit acts as a slave device in the first Bluetooth piconet, and acts as a master device in a second Bluetooth piconet. The main Bluetooth circuit is set up according to a first An audio sampling clock samples a first audio data, and based on the timing data of a first master clock generated by the source Bluetooth device, a first slave clock and a second clock synchronized with the first master clock are generated. Two master clocks to transmit or receive packets in the first Bluetooth picone based on the first slave clock, and transmit or receive packets in the second Bluetooth picone based on the second master clock. The auxiliary Bluetooth circuit includes: a second Bluetooth communication circuit; a second clock adjustment circuit; a second control circuit, coupled to the second Bluetooth communication circuit and the second clock adjustment circuit, configured to control the auxiliary The Bluetooth circuit acts as a slave device in the second Bluetooth piconet; a second sampling clock adjustment circuit, coupled to the second control circuit; and a second asynchronous sampling rate conversion circuit, coupled to the second The sampling clock adjustment circuit is configured to sample a second audio data according to a second audio sampling clock, and send the sampled data to a second playback circuit for playback; wherein the second control circuit is also configured to perform The following operations: according to the timing data of the second master clock, control the second clock adjustment circuit to generate a second slave clock synchronized with the second master clock; and control the second Bluetooth communication circuit according to the first The second slave clock transmits or receives packets in the second Bluetooth piconet.

One of the advantages of the above embodiment is that the second slave clock used by the secondary Bluetooth circuit is synchronized with the second master clock and indirectly synchronized with the first master clock. Therefore, the Bluetooth bandwidth usage of the secondary Bluetooth circuit can be effectively improved. effectiveness.

Another advantage of the above embodiment is that the second audio sampling clock used by the secondary Bluetooth circuit is indirectly synchronized with the first audio sampling clock used by the main Bluetooth circuit, so the audio playback operation of the second playback circuit will also be The audio playback operation of the first playback circuit is synchronized with each other.

Other advantages of the present invention will be explained in more detail with the following description and drawings.

100: Multi-member Bluetooth device

102: source Bluetooth device

110: main Bluetooth circuit

111: first Bluetooth communication circuit

112: first packet parsing circuit

113: first clock adjusting circuit (first clock adjusting circuit)

114: first control circuit

115: first buffer circuit

116: first sampling-clock adjusting circuit (first sampling-clock adjusting circuit)

117: first asynchronous sample rate conversion circuit

118: first playback circuit

120: auxiliary Bluetooth circuit

121: second Bluetooth communication circuit

122: second packet parsing circuit

123: second clock adjusting circuit

124: second control circuit

125: second buffer circuit

126: second sampling-clock adjusting circuit (second sampling-clock adjusting circuit)

127: second asynchronous sample rate conversion circuit (second asynchronous sample rate conversion circuit)

128: second playback circuit

202~226, 422~426: operation

310: The first Bluetooth piconet (first piconet)

320: second piconet (second piconet)

FIG. 1 is a simplified functional block diagram of a multi-member Bluetooth device according to an embodiment of the present invention.

2 is a simplified flowchart of an embodiment of the method for synchronizing audio playback operations of different Bluetooth circuits according to the present invention.

3 is a simplified schematic diagram of an embodiment in which the multi-member Bluetooth devices of FIG. 1 constitute a star network.

4 is a simplified flowchart of another embodiment of the method for synchronizing audio playback operations of different Bluetooth circuits according to the present invention.

The embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals indicate the same or similar elements or method flows.

FIG. 1 is a simplified functional block diagram of a multi-member Bluetooth device 100 according to an embodiment of the present invention. The multi-member Bluetooth device 100 is used for data transmission with a source Bluetooth device 102 and includes a plurality of member circuits. For the convenience of description, only two member circuits are shown in the embodiment of FIG. 1, namely the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120.

In this embodiment, all member circuits in the multi-member Bluetooth device 100 have similar main circuit architectures, but different additional circuit elements can be set in different member circuits, and the circuit structure of all member circuits is not limited. Exactly the same. For example, as shown in FIG. 1, the main Bluetooth circuit 110 includes a first Bluetooth communication circuit 111, a first packet analysis circuit 112, a first clock adjustment circuit 113, a first control circuit 114, and a first buffer circuit. 115. A first sampling clock adjustment circuit 116, a first asynchronous sampling rate conversion circuit 117, and a first playback circuit 118. Similarly, the secondary Bluetooth circuit 120 includes a second Bluetooth communication circuit 121, a second packet analysis circuit 122, a second clock adjustment circuit 123, a second control circuit 124, a second buffer circuit 125, and a second The sampling clock adjustment circuit 126, a second asynchronous sampling rate conversion circuit 127, and a second playback circuit 128.

In the main Bluetooth circuit 110, the first Bluetooth communication circuit 111 is configured to be used for data communication with other Bluetooth devices. The first packet parsing circuit 112 is configured to be used for parsing the Bluetooth packet received by the first Bluetooth communication circuit 111. The first clock adjustment circuit 113 is configured to adjust part of the working clock signal of the main Bluetooth circuit 110 to synchronize the main Bluetooth The piconet clock used between the circuit 110 and other Bluetooth devices.

The first control circuit 114 is coupled to the first Bluetooth communication circuit 111, the first packet analysis circuit 112, and the first clock adjustment circuit 113, and is configured to control the operation of the aforementioned circuits. In operation, the first control circuit 114 can directly communicate with the source Bluetooth device 102 through the first Bluetooth communication circuit 111 in a Bluetooth wireless transmission mode, and communicate with other member circuits through the first Bluetooth communication circuit 111. The first control circuit 114 also uses the first packet parsing circuit 112 to parse the packet received by the first Bluetooth communication circuit 111 to obtain related data or instructions.

The first buffer circuit 115 can be used to store audio data to be played (hereinafter referred to as the first audio data). In practice, the aforementioned first audio data may be the audio data stored in the first buffer circuit 115 in advance by the manufacturer or user, the audio data from the source Bluetooth device 102, and other Bluetooth circuits (for example, the secondary Bluetooth circuit 120). ) Audio data, or audio data from other circuits.

The first sampling clock adjustment circuit 116 is coupled to the first control circuit 114, and is configured to generate a first audio sampling clock according to the control of the first control circuit 114.

The first asynchronous sampling rate conversion circuit 117 is coupled to the first sampling clock adjustment circuit 116 and the first playback circuit 118, and is configured to compare the first audio data in the first buffer circuit 115 according to the first audio sampling clock. Sampling is performed, and the sampled data is sent to the first playback circuit 118 for playback.

In the secondary Bluetooth circuit 120, the second Bluetooth communication circuit 121 is configured to be used for data communication with other Bluetooth devices. The second packet parsing circuit 122 is configured to be used for parsing the Bluetooth packet received by the second Bluetooth communication circuit 121. The second clock adjustment circuit 123 is configured to adjust a part of the working clock signal of the secondary Bluetooth circuit 120 to synchronize the microgrid clock used between the secondary Bluetooth circuit 120 and other Bluetooth devices.

The second control circuit 124 is coupled to the second Bluetooth communication circuit 121, the second packet analysis circuit 122, and the second clock adjustment circuit 123, and is configured to control the operation of the aforementioned circuits. In operation, the second control circuit 124 can communicate with Bluetooth via the second Bluetooth communication circuit 121. It communicates data with other Bluetooth devices through wire transmission, and communicates data with other member circuits through the second Bluetooth communication circuit 121. The second control circuit 124 also uses the second packet analysis circuit 122 to parse the packet received by the second Bluetooth communication circuit 121 to obtain related data or instructions.

The second buffer circuit 125 can be used to store audio data to be played (hereinafter referred to as second audio data). In practice, the aforementioned second audio data can be the audio data stored in the second buffer circuit 125 in advance by the manufacturer or user, the audio data from the source Bluetooth device 102, or other Bluetooth circuits (for example, the main Bluetooth circuit 110). ) Audio data, or audio data from other circuits.

The second sampling clock adjustment circuit 126 is coupled to the second control circuit 124 and is configured to generate a second audio sampling clock according to the control of the second control circuit 124.

The second asynchronous sampling rate conversion circuit 127 is coupled to the second sampling clock adjustment circuit 126 and the second playback circuit 128, and is configured to compare the second audio data in the second buffer circuit 125 according to the second audio sampling clock. Sampling is performed, and the sampled data is sent to the second playback circuit 128 for playback.

In practice, both the aforementioned first Bluetooth communication circuit 111 and the second Bluetooth communication circuit 121 can be implemented by suitable wireless communication circuits that can support various versions of Bluetooth communication protocols. Both the aforementioned first packet analysis circuit 112 and the second packet analysis circuit 122 can be implemented by various packet demodulation circuits, digital arithmetic circuits, microprocessors, or application specific integrated circuits (ASICs). achieve. The aforementioned first clock adjustment circuit 113, second clock adjustment circuit 123, first sampling clock adjustment circuit 116, and second sampling clock adjustment circuit 126 can all be used to compare and adjust the clock frequency and/ Or the appropriate circuit of the clock phase can be implemented, for example, various phase-locked loops (PLL) or delay-locked loops (DLL) and so on. Both the aforementioned first control circuit 114 and the second control circuit 124 can be implemented by various microprocessors or digital signal processing circuits with appropriate computing capabilities. The aforementioned first buffer circuit 115 and second buffer circuit 125 can be used with various volatile storage circuits or Non-volatile storage circuit to achieve. The aforementioned first asynchronous sampling rate conversion circuit 117 and the second asynchronous sampling rate conversion circuit 127 can be implemented by various suitable digital circuits, analog circuits, or digital and analog hybrid circuits. The aforementioned first playback circuit 118 and second playback circuit 128 can be implemented by various suitable digital audio playback circuits, analog audio playback circuits, or mixed digital and analog playback circuits.

In some embodiments, the first clock adjustment circuit 113 or the second clock adjustment circuit 123 can also be integrated into the first control circuit 114 or the second control circuit 124, and the first sampling clock adjustment circuit can also be integrated 116 or the second sampling clock adjustment circuit 126 is integrated into the first control circuit 114 or the second control circuit 124. In addition, the aforementioned first packet analysis circuit 112 and the second packet analysis circuit 122 may be integrated into the aforementioned first Bluetooth communication circuit 111 and the second Bluetooth communication circuit 121, respectively.

In other words, the aforementioned first Bluetooth communication circuit 111 and the first packet analysis circuit 112 may be implemented by different circuits, or may be implemented by the same circuit. Similarly, the aforementioned second Bluetooth communication circuit 121 and the second packet analysis circuit 122 may be implemented by different circuits, or may be implemented by the same circuit.

In application, different functional blocks of the aforementioned main Bluetooth circuit 110 can also be integrated into a single circuit chip. For example, all the functional blocks in the main Bluetooth circuit 110 or other functional blocks except the first playback circuit 118 can be integrated into a single Bluetooth controller IC. Similarly, all the functional blocks in the secondary Bluetooth circuit 120 or other functional blocks except the second playback circuit 128 can also be integrated into another single Bluetooth control chip.

In practical applications, the multi-member Bluetooth device 100 can be used to implement a Bluetooth device that is used by multiple member circuits in conjunction with each other, for example, a pair of Bluetooth headsets, a group of Bluetooth speakers, and so on. The source Bluetooth device 102 can be implemented by various electronic devices with Bluetooth communication functions such as computers, mobile phones, tablets, smart speakers, and game consoles.

It can be seen from the foregoing description that different member circuits in the multi-member Bluetooth device 100 can communicate with each other through their respective Bluetooth communication circuits to form various types of Bluetooth networks. When the multi-member Bluetooth device 100 communicates with the source Bluetooth device 102, the source Bluetooth device 102 treats the multi-member Bluetooth device 100 as a single Bluetooth device.

The main Bluetooth circuit 110 can use various known mechanisms to receive the packets sent by the source Bluetooth device 102, and the secondary Bluetooth circuit 120 can use appropriate mechanisms to obtain the packets sent by the source Bluetooth device 102 during the operation of the main Bluetooth circuit 110.

For example, when the main Bluetooth circuit 110 receives a packet sent by the source Bluetooth device 102, the secondary Bluetooth circuit 120 can operate in a sniffing mode to actively sniff the packet sent by the source Bluetooth device 102. Alternatively, the secondary Bluetooth circuit 120 can operate in a relay mode, and only passively receive the packets forwarded after the primary Bluetooth circuit 110 receives the packets sent by the source Bluetooth device 102, without actively sniffing the source. A packet sent by the Bluetooth device 102.

Please note that the two terms "main Bluetooth circuit" and "secondary Bluetooth circuit" referred to in the specification and the scope of the patent application are just for the convenience of distinguishing different member circuits in different ways of receiving packets from the source Bluetooth device 102, and It does not indicate whether the main Bluetooth circuit 110 has a certain degree of control authority over other operations of the auxiliary Bluetooth circuit 120. In practice, the roles played by the primary Bluetooth circuit 110 and the secondary Bluetooth circuit 120 can also be interchanged intermittently, periodically, or when certain conditions are met.

Hereinafter, the operation mode of the multi-member Bluetooth device 100 will be further explained in conjunction with FIGS. 2 is a simplified flowchart of an embodiment of the method for synchronizing audio playback operations of different Bluetooth circuits according to the present invention. FIG. 3 is a simplified schematic diagram of an embodiment in which a multi-member Bluetooth device 100 forms a scatternet.

In the flowchart of FIG. 2, the process located in the column of a specific device represents the process performed by the specific device. For example, the part marked in the "source Bluetooth device" field is the process performed by the source Bluetooth device 102; the part marked in the "main Bluetooth circuit" field is the process performed by the main Bluetooth circuit 110; The part marked in the "Secondary Bluetooth Circuit" column is the process performed by the secondary Bluetooth circuit 120. The aforementioned logic is also applicable to other subsequent flowcharts.

As shown in FIG. 2, the main Bluetooth circuit 110 in the multi-member Bluetooth device 100 and the source Bluetooth device 102 will first perform the process 202 to establish the first Bluetooth micro-device shown in FIG. 3 in various ways that comply with the Bluetooth communication standards.网310. In the process 202, the source Bluetooth device 102 will act as the master device in the first Bluetooth piconet 310, and the master Bluetooth circuit 110 in the multi-member Bluetooth device 100 will act as the slave device in the first Bluetooth piconet 310 (slave).

In the process 204, the source Bluetooth device 102 generates a first main clock CLK_P1M, and schedules the transmission or reception timing of Bluetooth packets in the first Bluetooth piconet 310 according to the first main clock CLK_P1M. Therefore, the first master clock CLK_P1M is not only the native system clock of the source Bluetooth device 102, but also the master clock of the first Bluetooth piconet 310.

In addition, the source Bluetooth device 102 can generate and transmit a first piconet timing packet including timing data of the first master clock CLK_P1M to the first Bluetooth picone 310. In practice, the source Bluetooth device 102 can use various suitable data as the timing data of the first main clock CLK_P1M. For example, the source Bluetooth device 102 can use the count value of a specific edge (for example, rising edge) of the first main clock CLK_P1M as the timing data of the first main clock CLK_P1M, and set the first main clock The counter value corresponding to CLK_P1M is written into a frequency hop synchronization packet (FHS packet) to form the first piconet timing packet.

In the process 206, the master Bluetooth circuit 110 can generate a first slave clock CLK_P1S1 that is synchronized with the first master clock CLK_P1M according to the timing data of the first master clock CLK_P1M to serve as the first slave clock CLK_P1S1 in the first Bluetooth piconet 310 Slave clock (slave clock). In practice, the first Bluetooth communication circuit 111 can receive the first piconet timing packet generated by the source Bluetooth device 102 through the first Bluetooth piconet 310, and the first control circuit 114 can control the first packet parsing circuit 112, A piconet timing packet obtains the timing data of the aforementioned first main clock CLK_P1M, for example, the related count value.

Then, the first control circuit 114 can control the first clock adjustment circuit 113 to generate the first slave clock CLK_P1S1 synchronized with the first master clock CLK_P1M according to the timing data of the first master clock CLK_P1M. For example, the first control circuit 114 can control the first clock adjustment circuit 113 to adjust the frequency and/or phase offset of a first reference clock CLK_R1 according to the timing data of the first main clock CLK_P1M to generate a frequency substantially The same as the first master clock CLK_P1M and the phase is substantially aligned with the first slave clock CLK_P1S1 of the first master clock CLK_P1M. In practice, the aforementioned first reference clock CLK_R1 can be generated by various suitable clock generation circuits inside or outside the main Bluetooth circuit 110.

In operation, the first control circuit 114 can control the first Bluetooth communication circuit 111 to schedule the transmission or reception timing of Bluetooth packets in the first Bluetooth piconet 310 according to the first slave clock CLK_P1S1.

In the process 208, the primary Bluetooth circuit 110 and the secondary Bluetooth circuit 120 in the multi-member Bluetooth device 100 can establish the second Bluetooth piconet 320 as shown in FIG. 3 in various ways that comply with the Bluetooth communication standards. In this embodiment, the main Bluetooth circuit 110 will act as the master device in the second Bluetooth piconet 320, and the secondary Bluetooth circuit 120 will act as the slave device in the second Bluetooth piconet 320.

In other words, the main Bluetooth circuit 110 not only belongs to the aforementioned first Bluetooth piconet 310, but also belongs to the second Bluetooth piconet 320 at the same time.

In the process 210, the first control circuit 114 can control the first clock adjustment circuit 113 to generate synchronization with the first master clock CLK_P1M according to the timing data of the first master clock CLK_P1M or the first slave clock CLK_P1S1 The second main clock CLK_P2M. For example, the first control circuit 114 can control the first clock adjustment circuit 113 to adjust the frequency and/or of the aforementioned first reference clock CLK_R1 according to the timing data of the first master clock CLK_P1M or the first slave clock CLK_P1S1. Or the phase offset to generate a second main clock CLK_P2M whose frequency is substantially the same as that of the first main clock CLK_P1M and whose phase is substantially aligned with the first main clock CLK_P1M.

In operation, the first control circuit 114 can control the first Bluetooth communication circuit 111 to schedule the transmission or reception timing of Bluetooth packets in the second Bluetooth piconet 320 according to the second main clock CLK_P2M. Therefore, the second main clock CLK_P2M is not only the native system clock of the main Bluetooth circuit 110, but also the master clock of the second Bluetooth piconet 320.

It can be seen from the foregoing description that the first slave clock CLK_P1S1 and the second master clock CLK_P2M generated by the first clock adjustment circuit 113 are both synchronized with the first master clock CLK_P1M generated by the source Bluetooth device 102. That is, the frequencies of both the first slave clock CLK_P1S1 and the second master clock CLK_P2M are substantially the same as the first master clock CLK_P1M, and the phases of both are substantially aligned with the first master clock CLK_P1M.

In practice, the first control circuit 114 can respectively assign different count values to the aforementioned first slave clock CLK_P1S1 and the second master clock CLK_P2M.

The aforementioned method of synchronizing the first slave clock CLK_P1S1 and the second master clock CLK_P2M in the master Bluetooth circuit 110 with each other can effectively improve the Bluetooth bandwidth utilization efficiency of the master Bluetooth circuit 110.

In addition, in the aforementioned process 210, the first control circuit 114 can also generate a second piconet timing packet containing the timing data of the second main clock CLK_P2M, and use the first Bluetooth communication circuit 111 to package the second piconet timing packet Transfer to the second Bluetooth piconet 320. In practice, the first control circuit 114 can use various suitable data as the timing data of the second main clock CLK_P2M. For example, the first control circuit 114 can use the count value of a specific edge (for example, rising edge) of the second main clock CLK_P2M as the timing data of the second main clock CLK_P2M, and correspond to the second main clock CLK_P2M The count value of is written into a frequency hopping synchronization packet to form the second piconet timing packet.

In the process 212, the secondary Bluetooth circuit 120 can generate a second slave clock CLK_P2S1 that is synchronized with the second master clock CLK_P2M according to the timing data of the second master clock CLK_P2M, to be used as the second master clock CLK_P2S1 in the second Bluetooth piconet 320 One slave device clock. In practice, the second Bluetooth communication The signaling circuit 121 can receive the second piconet timing packet generated by the main Bluetooth circuit 110 through the second Bluetooth piconet 320, and the second control circuit 124 may control the second packet parsing circuit 122, from the second piconet timing packet Obtain the timing data of the aforementioned second main clock CLK_P2M, for example, the related count value.

Then, the second control circuit 124 can control the second clock adjustment circuit 123 to generate a second slave clock CLK_P2S1 synchronized with the second master clock CLK_P2M according to the timing data of the second master clock CLK_P2M. For example, the second control circuit 124 can control the second clock adjustment circuit 123 to adjust the frequency and/or phase offset of a second reference clock CLK_R2 according to the timing data of the second main clock CLK_P2M, so as to generate the frequency substantially The second master clock CLK_P2M is the same as the second master clock CLK_P2M, and the phase is substantially aligned with the second slave clock CLK_P2S1 of the second master clock CLK_P2M. In practice, the aforementioned second reference clock CLK_R2 can be generated by various suitable clock generation circuits inside or outside the secondary Bluetooth circuit 120.

In addition, in the process 212, the second control circuit 124 can also control the second clock adjustment circuit 123 to generate a third slave clock CLK_P1S2 synchronized with the second master clock CLK_P2M according to the timing data of the second master clock CLK_P2M . For example, the second control circuit 124 can control the second clock adjustment circuit 123 to adjust the frequency and/or phase offset of the aforementioned second reference clock CLK_R2 according to the timing data of the second main clock CLK_P2M to generate the frequency substantially The third slave clock CLK_P1S2 of the second master clock CLK_P2M is the same as the second master clock CLK_P2M and substantially aligned in phase with the third slave clock CLK_P1S2 of the second master clock CLK_P2M.

Since the second master clock CLK_P2M generated by the master Bluetooth circuit 110 is synchronized with the first master clock CLK_P1M generated by the source Bluetooth device 102, the aforementioned third slave clock CLK_P1S2 generated by the second clock adjustment circuit 123 is also It is indirectly synchronized with the first master clock CLK_P1M generated by the source Bluetooth device 102, so the secondary Bluetooth circuit 120 can use the third slave clock CLK_P1S2 as a slave device clock in the first Bluetooth piconet 310. In this way, the secondary Bluetooth circuit 120 can receive the Bluetooth packets in the first Bluetooth piconet 310 through sniffing without the source Bluetooth device 102 knowing.

It can be seen from the foregoing description that the second slave clock CLK_P2S1 and the third slave clock CLK_P1S2 generated by the second clock adjustment circuit 123 are both synchronized with the second master clock CLK_P2M generated by the master Bluetooth circuit 110. That is, the frequencies of both the second slave clock CLK_P2S1 and the third slave clock CLK_P1S2 are substantially the same as the second master clock CLK_P2M, and their phases are substantially aligned with the second master clock CLK_P2M.

In practice, the second control circuit 124 can respectively assign different count values to the aforementioned second slave clock CLK_P2S1 and the third slave clock CLK_P1S2.

The aforementioned method of synchronizing the second slave clock CLK_P2S1 and the third slave clock CLK_P1S2 in the auxiliary Bluetooth circuit 120 with each other can effectively improve the Bluetooth bandwidth utilization efficiency of the auxiliary Bluetooth circuit 120.

Next, the second control circuit 124 can control the second Bluetooth communication circuit 121 to schedule the transmission or reception timing of Bluetooth packets in the second Bluetooth piconet 320 according to the second slave clock CLK_P2S1. In addition, the second control circuit 124 can also schedule the reception timing of Bluetooth packets in the first Bluetooth piconet 310 according to the third slave clock CLK_P1S2 to sniff the Bluetooth packets in the first Bluetooth piconet 310.

As shown in FIG. 2, the multi-member Bluetooth device 100 in this embodiment also performs the operations of the process 214 to the process 226 to enable the audio playback of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 to be synchronized.

In the process 214, the first control circuit 114 can control the first sampling clock adjustment circuit 116 to generate a first audio signal synchronized with the first master clock CLK_P1M, the first slave clock CLK_P1S1, or the second master clock CLK_P2M Sampling clock CLK_A1. In this embodiment, the first audio sampling clock CLK_A1 is a clock signal used to sample the first audio data stored in the first buffer circuit 115, so the frequency of the first audio sampling clock CLK_A1 is usually higher than The first master clock CLK_P1M, the first slave clock CLK_P1S1, and the second master clock CLK_P2M are lower, but the frequency of the first audio sampling clock CLK_A1 will be the same as the aforementioned first master clock CLK_P1M, first slave clock The frequency of CLK_P1S1 or the second main clock CLK_P2M maintains a fixed ratio relationship.

For example, the first control circuit 114 can control the first sampling clock adjustment circuit 116 to adjust the frequency and/or phase offset of the first sampling clock CLK_S1 according to the timing data of the first main clock CLK_P1M to generate a frequency substantially It is in a predetermined multiplying relationship with the first main clock CLK_P1M, and the phase is substantially aligned with the first audio sampling clock CLK_A1 of the first main clock CLK_P1M.

For another example, the first control circuit 114 can control the first sampling clock adjustment circuit 116 to adjust the frequency and/or phase offset of the first sampling clock CLK_S1 according to the timing data of the first slave clock CLK_P1S1, so as to generate the frequency essence. The above is in a predetermined multiplication relationship with the first slave clock CLK_P1S1, and the phase is substantially aligned with the first audio sampling clock CLK_A1 of the first slave clock CLK_P1S1.

For another example, the first control circuit 114 can control the first sampling clock adjustment circuit 116 to adjust the frequency and/or phase offset of the first sampling clock CLK_S1 according to the timing data of the second main clock CLK_P2M to generate the frequency essence The upper and second main clock CLK_P2M are in a predetermined ratio relationship, and the phase is substantially aligned with the first audio sampling clock CLK_A1 of the second main clock CLK_P2M.

In practice, the aforementioned first sampling clock CLK_S1 can be generated by various suitable clock generation circuits inside or outside the main Bluetooth circuit 110.

In the process 216, the first asynchronous sampling rate conversion circuit 117 can sample the first audio data stored in the first buffer circuit 115 according to the first audio sampling clock CLK_A1 under the control of the first control circuit 114 , And send the sampled audio data to the first playback circuit 118 for playback.

On the other hand, the secondary Bluetooth circuit 120 will also perform the processes 218 and 220 in FIG. 2.

In the process 218, the second control circuit 124 can control the second sampling clock adjustment circuit 126 to generate synchronization with the second master clock CLK_P2M, the second slave clock CLK_P2S1, or the third slave clock CLK_P1S2, and the frequency is substantially A second audio sampling clock CLK_A2 that is the same as the first audio sampling clock CLK_A1. In this embodiment, the second audio sampling clock CLK_A2 is used to process the second audio data stored in the second buffer circuit 125 Line sampling clock signal, so the frequency of the second audio sampling clock CLK_A2 is usually lower than the second master clock CLK_P2M, the second slave clock CLK_P2S1, and the third slave clock CLK_P1S2, but the second audio sampling clock The frequency of the pulse CLK_A2 will maintain a fixed rate relationship with the frequency of the aforementioned second master clock CLK_P2M, second slave clock CLK_P2S1, or third slave clock CLK_P1S2.

For example, the second control circuit 124 can control the second sampling clock adjustment circuit 126 to adjust the frequency and/or phase offset of a second sampling clock CLK_S2 according to the timing data of the second main clock CLK_P2M to generate the frequency essence. The upper and the second main clock CLK_P2M are in a predetermined ratio relationship, and the phase is substantially aligned with the second audio sampling clock CLK_A2 of the second main clock CLK_P2M.

For another example, the second control circuit 124 can control the second sampling clock adjustment circuit 126 to adjust the frequency and/or phase offset of the second sampling clock CLK_S2 according to the timing data of the second slave clock CLK_P2S1 to generate the frequency essence The upper and the second slave clock CLK_P2S1 are in a predetermined rate relationship, and the phase is substantially aligned with the second audio sampling clock CLK_A2 of the second slave clock CLK_P2S1.

For another example, the second control circuit 124 can control the second sampling clock adjustment circuit 126 to adjust the frequency and/or phase offset of the second sampling clock CLK_S2 according to the timing data of the third slave clock CLK_P1S2 to generate the frequency essence. The upper and the third slave clock CLK_P1S2 are in a predetermined rate relationship, and the phase is substantially aligned with the second audio sampling clock CLK_A2 of the third slave clock CLK_P1S2.

In practice, the aforementioned second sampling clock CLK_S2 can be generated by various suitable clock generation circuits inside or outside the secondary Bluetooth circuit 120.

In the process 220, the second asynchronous sampling rate conversion circuit 127 can sample the second audio data stored in the second buffer circuit 125 according to the second audio sampling clock CLK_A2 under the control of the second control circuit 124 , And send the sampled audio data to the second playback circuit 128 for playback.

From the foregoing description, it can be seen that the first audio sampling clock CLK_A1 generated by the main Bluetooth circuit 110, Will be synchronized with the first master clock CLK_P1M, the first slave clock CLK_P1S1, or the second master clock CLK_P2M, and the second audio sampling clock CLK_A2 generated by the secondary Bluetooth circuit 120 will be synchronized with the second master clock CLK_P2M, The second slave clock CLK_P2S1 or the third slave clock CLK_P1S2 is synchronized. Since the first master clock CLK_P1M, the first slave clock CLK_P1S1, the second master clock CLK_P2M, the second slave clock CLK_P2S1, and the third slave clock CLK_P1S2 in this embodiment are substantially synchronized with each other and are phase-aligned Therefore, the first audio sampling clock CLK_A1 is also indirectly synchronized with the second audio sampling clock CLK_A2, and the phase is substantially aligned with the second audio sampling clock CLK_A2.

In this way, the audio playback operations of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can be synchronized with each other without the problem of time delay. Therefore, the aforementioned method of generating the first audio sampling clock CLK_A1 and the second audio sampling clock CLK_A2 enables the audio playback operations of different Bluetooth circuits to be synchronized with each other, creating ideal stereo sound effects or surround sound effects, which can be brought to users A good user experience improves the application value and flexibility of the multi-member Bluetooth device 100.

It can be seen from the foregoing description that the first audio sampling clock CLK_A1 in the main Bluetooth circuit 110 is directly or indirectly generated based on the first reference clock CLK_R1 and the first sampling clock CLK_S1, and the second audio signal in the secondary Bluetooth circuit 120 The sampling clock CLK_A2 is directly or indirectly generated based on the second reference clock CLK_R2 and the second sampling clock CLK_S2.

Generally speaking, the first reference clock CLK_R1 used by the primary Bluetooth circuit 110 and the second reference clock CLK_R2 used by the secondary Bluetooth circuit 120 are clock signals generated independently of each other. In addition, the first sampling clock CLK_S1 used by the primary Bluetooth circuit 110 and the second sampling clock CLK_S2 used by the secondary Bluetooth circuit 120 are also clock signals generated independently of each other.

Therefore, after both the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 perform audio playback operations for a period of time, the first audio sampling clock CLK_A1 in the main Bluetooth circuit 110 and the second audio sampling clock CLK_A2 in the auxiliary Bluetooth circuit 120 , There may be Current frequency and/or phase deviation.

If the first audio sampling clock CLK_A1 in the main Bluetooth circuit 110 and the second audio sampling clock CLK_A2 in the auxiliary Bluetooth circuit 120 cannot be continuously synchronized, it will cause the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 to fail. Audio playback operations cannot be synchronized with each other, resulting in a poor user experience.

Therefore, in this embodiment, the main Bluetooth circuit 110 will intermittently perform the process 222 during the process of playing audio data, and the secondary Bluetooth circuit 120 will intermittently perform the process 224 and the process 226 during the process of playing audio data.

In the process 222, the first control circuit 114 may transmit a first audio playback timing data (time stamp) corresponding to the first audio data to the secondary Bluetooth circuit 120 through the first Bluetooth communication circuit 111. In practice, the first control circuit 114 can use the relevant count value (for example, pulse count value, rising edge count value, falling edge count value, etc.) of the first audio sampling clock CLK_A1 as the aforementioned first The audio playback timing data is transmitted to the secondary Bluetooth circuit 120 through the first Bluetooth communication circuit 111.

In the process 224, the second control circuit 124 may receive the first audio playback timing data from the main Bluetooth circuit 110 through the second Bluetooth communication circuit 121.

In the process 226, the second control circuit 124 may control the second sampling clock adjustment circuit 126 to correct the phase of the second audio sampling clock CLK_A2 according to the first audio playback timing data (for example, the aforementioned related count value), so that The corrected second audio sampling clock CLK_A2 is synchronized with the current first audio sampling clock CLK_A1.

Therefore, through the operations of the aforementioned process 222 to process 226, it can be effectively ensured that the audio playback operations of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can continue to be synchronized without the problem of time delay. In this way, the audio playback operation of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can be made to create an ideal stereo sound effect or surround sound effect, maintain a good user experience, and enhance the application value and application value of the multi-member Bluetooth device 100. Use flexibility.

Please refer to Figure 4, which shows the audio playback used to synchronize different Bluetooth circuits in the present invention A simplified flowchart of another embodiment of the method of operation.

The processes 202 to 220 in FIG. 4 are all the same as the corresponding processes in the foregoing embodiment of FIG. 2. However, in the embodiment of FIG. 4, the way in which the audio playback operations of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can be continuously maintained in synchronization is different from the foregoing embodiment of FIG. 2.

As shown in FIG. 4, the secondary Bluetooth circuit 120 in this embodiment will intermittently perform process 422 during the process of playing audio data, and the main Bluetooth circuit 110 will intermittently perform process 424 and process during the process of playing audio data. 426.

In the process 422, the second control circuit 124 may transmit a second audio playback timing data corresponding to the second audio data to the main Bluetooth circuit 110 through the second Bluetooth communication circuit 121. In practice, the second control circuit 124 can use the related count value (for example, pulse count value, rising edge count value, falling edge count value, etc.) of the second audio sampling clock CLK_A2 as the aforementioned second The audio playback timing data is transmitted to the main Bluetooth circuit 110 through the second Bluetooth communication circuit 121.

In the process 424, the first control circuit 114 can receive the second audio playback timing data from the secondary Bluetooth circuit 120 through the first Bluetooth communication circuit 111.

In the process 426, the first control circuit 114 can control the first sampling clock adjustment circuit 116 to correct the phase of the first audio sampling clock CLK_A1 according to the second audio playback timing data (for example, the aforementioned related count value), so that The corrected first audio sampling clock CLK_A1 is synchronized with the current second audio sampling clock CLK_A2.

Therefore, the operation of the aforementioned process 422 to process 426 can also effectively ensure that the audio playback operations of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can continue to be synchronized without the problem of time delay. In this way, the audio playback operation of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can be made to create an ideal stereo sound effect or surround sound effect, maintain a good user experience, and enhance the application value and application value of the multi-member Bluetooth device 100. Use flexibility.

In the aforementioned multi-member Bluetooth device 100, the main Bluetooth circuit 110 will The slave clock CLK_P1S1 and the second main clock CLK_P2M are synchronized with the first main clock CLK_P1M determined by the source Bluetooth device 102, so the first clock adjustment circuit 113 can be implemented with a simplified circuit structure.

In addition, the first slave clock CLK_P1S1 and the second master clock CLK_P2M used by the master Bluetooth circuit 110 are both synchronized with the first master clock CLK_P1M, which can effectively improve the Bluetooth bandwidth usage efficiency of the master Bluetooth circuit 110 and reduce the master clock. The Bluetooth circuit 110 updates the complexity of the first slave clock CLK_P1S1 and the second master clock CLK_P2M.

Similarly, the secondary Bluetooth circuit 120 synchronizes its internal second slave clock CLK_P2S1 and third slave clock CLK_P1S2 with the second master clock CLK_P2M determined by the master Bluetooth circuit 110, so the second clock adjustment circuit 123 It can also be implemented with a simplified circuit architecture.

Furthermore, the second slave clock CLK_P2S1 and the third slave clock CLK_P1S2 used by the secondary Bluetooth circuit 120 are synchronized with the second master clock CLK_P2M, and are equivalently synchronized with the first master clock CLK_P1M, so they can be effective The utilization efficiency of the Bluetooth bandwidth of the secondary Bluetooth circuit 120 is improved, and the complexity of the secondary Bluetooth circuit 120 in updating the second slave clock CLK_P2S1 and the third slave clock CLK_P1S2 is reduced.

More importantly, the second audio sampling clock CLK_A2 used by the secondary Bluetooth circuit 120 can be indirectly synchronized with the first audio sampling clock CLK_A1 used by the main Bluetooth circuit 110, so the audio playback operation of the second playback circuit 128 is also The audio playback operation of the first playback circuit 118 is synchronized with each other.

Please note that the number of member circuits in the aforementioned multi-member Bluetooth device 100 is not limited to the aforementioned two, and can be expanded to a larger number as needed.

In practice, the multi-member Bluetooth device 100 can selectively use one of the two audio playback synchronization methods shown in FIG. 2 and FIG. 4 to ensure that the audio playback operation of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can be performed. Keep in sync. Alternatively, the multi-member Bluetooth device 100 may alternately adopt two methods to ensure that the audio playback operations of the main Bluetooth circuit 110 and the auxiliary Bluetooth circuit 120 can continue to be synchronized.

In addition, in some applications, the operation of the secondary Bluetooth circuit 120 to generate the third slave clock CLK_P1S2 can also be omitted.

In the specification and the scope of the patent application, certain words are used to refer to specific elements, and those skilled in the art may use different terms to refer to the same elements. This specification and the scope of patent application do not use differences in names as a way to distinguish components, but use differences in functions of components as a basis for distinction. The "including" mentioned in the specification and the scope of the patent application is an open term and should be interpreted as "including but not limited to". In addition, the term "coupling" here includes any direct and indirect connection means. Therefore, if it is described that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection, wireless transmission, optical transmission, or other signal connection methods, or through other elements or connections. The means is indirectly connected to the second element electrically or signally.

The description method of "and/or" used in the description includes one of the listed items or any combination of multiple items. In addition, unless otherwise specified in the specification, any term in the singular case includes the meaning of the plural case at the same time.

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should fall within the scope of the present invention.

100: Multi-member Bluetooth device

102: Source Bluetooth device

110: Main Bluetooth circuit

111: The first Bluetooth communication circuit

112: The first packet parsing circuit

113: The first clock adjustment circuit

114: The first control circuit

115: first buffer circuit

116: The first sampling clock adjustment circuit

117: The first non-synchronous sampling rate conversion circuit

118: The first playback circuit

120: Secondary Bluetooth circuit

121: The second Bluetooth communication circuit

122: The second packet analysis circuit

123: Second clock adjustment circuit

124: second control circuit

125: second buffer circuit

126: Second sampling clock adjustment circuit

127: Second asynchronous sampling rate conversion circuit

128: second playback circuit

Claims (10)

A main Bluetooth circuit (110) in a multi-member Bluetooth device (100), the multi-member Bluetooth device (100) is used for data transmission with a source Bluetooth device (102), and includes the main Bluetooth circuit (110) and a A secondary Bluetooth circuit (120), the source Bluetooth device (102) acts as a master device (master) in a first Bluetooth piconet (310), the main Bluetooth circuit (110) includes: a first Bluetooth communication circuit (111) ); a first clock adjustment circuit (113); a first control circuit (114), coupled to the first Bluetooth communication circuit (111) and the first clock adjustment circuit (113), configured to control the The master Bluetooth circuit (110) acts as a slave in the first Bluetooth piconet (310) and a master in a second Bluetooth piconet (320); a first sampling clock adjustment circuit (116), coupled to the first control circuit (114); and a first asynchronous sampling rate conversion circuit (117), coupled to the first sampling clock adjustment circuit (116), configured to be based on a first An audio sampling clock (CLK_A1) samples a first audio data, and sends the sampled data to a first playback circuit (118) for playback; wherein, the first control circuit (114) is also configured to perform the following operations : According to the timing data of a first main clock (CLK_P1M) generated by the source Bluetooth device (102), control the first clock adjustment circuit (113) to generate a first main clock (CLK_P1M) synchronous A first slave clock (CLK_P1S1) and a second master clock (CLK_P2M); and controlling the first Bluetooth communication circuit (111) to operate on the first Bluetooth piconet (310) according to the first slave clock (CLK_P1S1) The first Bluetooth communication circuit (111) is controlled to transmit or receive packets in the second Bluetooth piconet (320) according to the second main clock (CLK_P2M), so that the secondary Bluetooth circuit (120) )according to The packet is transmitted or received in the second Bluetooth piconet (320) according to a second slave clock (CLK_P2S1) synchronized with the second master clock (CLK_P2M). The main Bluetooth circuit (110) according to claim 1, wherein the first control circuit (114) is further configured to control the first sampling clock adjustment circuit (116) to generate a signal that is connected to the first main clock (CLK_P1M). ), the first slave clock (CLK_P1S1), or the second master clock (CLK_P2M) synchronized with the first audio sampling clock (CLK_A1). The main Bluetooth circuit (110) according to claim 2, wherein the first control circuit (114) is further configured to transmit a first audio data corresponding to the first audio data through the first Bluetooth communication circuit (111). The audio playback timing data is provided to the secondary Bluetooth circuit (120) for the secondary Bluetooth circuit (120) to correct a second audio sampling clock (CLK_A2) according to the first audio playback timing data, so that the corrected second audio The sampling clock (CLK_A2) is synchronized with the current first audio sampling clock (CLK_A1). The main Bluetooth circuit (110) according to claim 2, wherein the main Bluetooth circuit (110) is further configured to receive a second audio playback timing data through the first Bluetooth communication circuit (111), and control the first The sampling clock adjustment circuit (116) corrects the phase of the first audio sampling clock (CLK_A1) according to the second audio playback timing data, so that the corrected first audio sampling clock (CLK_A1) is synchronized with the secondary A second audio sampling clock (CLK_A2) currently generated by the Bluetooth circuit (120). The main Bluetooth circuit (110) according to claim 2, wherein the first control circuit (114) controls the first clock adjustment circuit (113) according to the timing data of the first main clock (CLK_P1M) Generate the first slave clock (CLK_P1S1) that is the same in frequency as the first master clock (CLK_P1M) and aligned in phase with the first master clock (CLK_P1M), and the first control circuit (114) also According to the timing data of the first master clock (CLK_P1M) or the first slave clock (CLK_P1S1), the first clock adjustment circuit (113) is controlled to generate the same frequency as the first master clock (CLK_P1M) And the second main clock (CLK_P2M) which is aligned in phase with the first main clock (CLK_P1M). A secondary Bluetooth circuit (120) in a multi-member Bluetooth device (100), the multi-member Bluetooth The device (100) is used for data transmission with a source Bluetooth device (102), and includes a main Bluetooth circuit (110) and the secondary Bluetooth circuit (120). The source Bluetooth device (102) acts as a first Bluetooth piconet (310) a master device (master), the master Bluetooth circuit (110) acts as a slave device (slave) in the first Bluetooth piconet (310) and acts as a second Bluetooth piconet (320) A master device in which the master Bluetooth circuit (110) is configured to sample a first audio data according to a first audio sampling clock (CLK_A1), and according to a first master clock generated by the source Bluetooth device (102) (CLK_P1M) timing data to generate a first slave clock (CLK_P1S1) and a second master clock (CLK_P2M) synchronized with the first master clock (CLK_P1M), so as to generate a first slave clock (CLK_P1S1) according to the first slave clock (CLK_P1S1). ) Transmit or receive packets in the first Bluetooth piconet (310), and transmit or receive packets in the second Bluetooth piconet (320) according to the second main clock (CLK_P2M), the secondary Bluetooth circuit (120) ) Includes: a second Bluetooth communication circuit (121); a second clock adjustment circuit (123); a second control circuit (124), coupled to the second Bluetooth communication circuit (121) and the second time The pulse adjustment circuit (123) is configured to control the secondary Bluetooth circuit (120) to act as a slave device in the second Bluetooth piconet (320); a second sampling clock adjustment circuit (126) is coupled to the first Two control circuits (124); and a second asynchronous sampling rate conversion circuit (127), coupled to the second sampling clock adjustment circuit (126), configured to sample according to a second audio sampling clock (CLK_A2) A second audio data, and the sampled data is sent to a second playback circuit (128) for playback; wherein, the second control circuit (124) is also configured to perform the following operations: according to the second main clock ( CLK_P2M), control the second clock adjustment circuit (123) to generate a second slave clock (CLK_P2S1) synchronized with the second master clock (CLK_P2M); and control the second Bluetooth communication circuit (121) ) According to the second slave clock (CLK_P2S1) The packet is transmitted or received in the second Bluetooth piconet (320). The secondary Bluetooth circuit (120) according to claim 6, wherein the second control circuit (124) is further configured to control the second sampling clock adjustment circuit (126) to generate the second main clock (CLK_P2M) Or the second audio sampling clock (CLK_A2) synchronized with the second slave clock (CLK_P2S1), so that the second audio sampling clock (CLK_A2) is indirectly synchronized with a first audio generated by the master Bluetooth device (110) Sampling clock (CLK_A1). The secondary Bluetooth circuit (120) according to claim 7, wherein the second control circuit (124) is further configured to receive a first audio signal corresponding to the first audio data through the second Bluetooth communication circuit (121) Play timing data, and control the second sampling clock adjustment circuit (126) to correct the phase of the second audio sampling clock (CLK_A2) according to the first audio playback timing data, so that the corrected second audio sample The clock (CLK_A2) is synchronized with the current first audio sampling clock (CLK_A1). The secondary Bluetooth circuit (120) according to claim 7, wherein the second control circuit (124) is further configured to transmit a second audio data corresponding to the second audio data through the second Bluetooth communication circuit (121). Audio playback timing data is provided to the main Bluetooth circuit (110) for the main Bluetooth circuit (110) to correct the phase of the first audio sampling clock (CLK_A1), so that the corrected first audio sampling clock (CLK_A1) Synchronize with the current second audio sampling clock (CLK_A2). The secondary Bluetooth circuit (120) according to claim 7, wherein the second control circuit (124) controls the second clock adjustment circuit (123) according to the timing data of the second main clock (CLK_P2M) Generate the second slave clock (CLK_P2S1) that is the same in frequency as the second master clock (CLK_P2M) and aligned in phase with the second master clock (CLK_P2M).

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