TWI727897B - Auxiliary bluetooth circuit of multi-member bluetooth device capable of reducing complexity of updating internal clock of bluetooth circuit - Google Patents

Abstract

An auxiliary Bluetooth circuit of a multi-member Bluetooth device for communicating data with a source Bluetooth device, wherein the source Bluetooth device acts as a master in a first piconet. A main Bluetooth circuit of the multi-member Bluetooth device 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 according to a first main clock generated by the source Bluetooth device, so that both the first slave clock and the second main clock are synchronized with the first main clock. The auxiliary Bluetooth circuit generates a second slave clock and a third slave clock according to the second main clock, so that both the second slave clock and the third slave clock are synchronized with the second main clock. The auxiliary Bluetooth circuit sniffs Bluetooth packets transmitted through the first piconet form the source Bluetooth device.

Description

Secondary bluetooth circuit in multi-member bluetooth device capable of reducing the complexity of internal clock update of bluetooth circuit

The invention relates to Bluetooth technology, in particular to a secondary Bluetooth circuit in a multi-member Bluetooth device that can reduce the complexity of updating the clock pulse of a microgrid.

According to the specifications of the Bluetooth communication standard, two or more Bluetooth circuits can form a Bluetooth piconet, and each Bluetooth circuit can belong to multiple different Bluetooth piconets at the same time. However, each Bluetooth circuit in the same Bluetooth piconet must schedule the operation of transmitting and receiving packets according to a specific piconet clock to avoid packet loss or packet collision ( packet collision) occurs.

In the traditional Bluetooth network architecture, the microgrid clocks used by different Bluetooth microgrids are independent and unrelated to each other. Therefore, if a Bluetooth circuit belongs to multiple Bluetooth piconets at the same time, the Bluetooth circuit must generate multiple internal clocks that are independent of each other, and update the offsets of the individual internal clocks from time to time, so that these internal clocks It can be synchronized with the corresponding microgrid clock respectively. Such an architecture will not only increase the internal circuit complexity of the Bluetooth circuit, but also reduce the Bluetooth bandwidth usage efficiency of the Bluetooth circuit.

In view of this, how to reduce the internal circuit complexity of the Bluetooth circuit and at the same time improve the efficiency of its Bluetooth bandwidth usage is really a problem to be solved.

This specification provides an embodiment of a secondary Bluetooth circuit in a multi-member Bluetooth device. More The 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 main device in a first Bluetooth piconet, and the main Bluetooth circuit acts as the second Bluetooth circuit. A slave device in a Bluetooth piconet acts as a master device in a second Bluetooth piconet. The master Bluetooth circuit will generate a frequency substantially equal to the first master clock generated by the source Bluetooth device. The first master clock is the same and the phase is substantially aligned with a first slave clock and a second master clock of the first master clock. The secondary Bluetooth circuit includes: a second Bluetooth communication circuit; a second packet analysis circuit configured to analyze packets received by the second Bluetooth communication circuit; a second clock adjustment circuit; and a second control circuit, coupled Is connected to the second Bluetooth communication circuit, the second packet analysis circuit, and the second clock adjustment circuit, and is configured to control the secondary Bluetooth circuit to act as a slave device in the second Bluetooth piconet; wherein, the second The control circuit is further 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 and a third slave that are synchronized with the second master clock Clock; and controlling the second Bluetooth communication circuit to operate according to the third slave clock to sniff the Bluetooth packet sent by the source Bluetooth device in the first Bluetooth piconet.

Another advantage of the above embodiment is that the secondary Bluetooth circuit synchronizes its internal second slave clock and third slave clock with the second master clock determined by the master Bluetooth circuit, so the second clock adjustment circuit It can be implemented with a simplified circuit architecture.

Another advantage of the above embodiment is that the second slave clock and the third slave clock used by the secondary Bluetooth circuit are both synchronized with the second master clock, and both are equivalently synchronized with the first master clock. Effectively improve the Bluetooth bandwidth utilization efficiency of the secondary Bluetooth circuit.

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

113: first packet parsing circuit

115: first clock adjusting circuit (first clock adjusting circuit)

117: first control circuit

120: auxiliary Bluetooth circuit

121: second Bluetooth communication circuit

123: second packet parsing circuit

125: second clock adjusting circuit

127: second control circuit

202~224, 402~412, 506~512: 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.

FIG. 2 is a simplified flowchart of an embodiment of an internal clock generation method adopted by the multi-member Bluetooth device of FIG. 1.

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

4 is a simplified flowchart of an embodiment of an internal clock update method adopted by the secondary Bluetooth circuit in FIG. 1.

FIG. 5 is a simplified flowchart of another embodiment of the internal clock update method adopted by the secondary Bluetooth circuit in FIG. 1.

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 113, a first clock adjustment circuit 115, and a first control circuit 117. Similarly, the secondary Bluetooth circuit 120 includes a second Bluetooth communication circuit 121, a second packet analysis circuit 123, a second clock adjustment circuit 125, and a second control circuit 127.

In the main Bluetooth circuit 110, the first Bluetooth communication circuit 111 can be used for data communication with other Bluetooth devices. The first packet parsing circuit 113 can be used to analyze the Bluetooth packet received by the first Bluetooth communication circuit 111. The first clock adjustment circuit 115 is coupled to the first packet parsing circuit 113, and can be used to adjust the internal clock signal of the main Bluetooth circuit 110 to synchronize the microgrid clock used between the main Bluetooth circuit 110 and other Bluetooth devices ( piconet clock).

The first control circuit 117 is coupled to the first Bluetooth communication circuit 111 and the first packet analysis circuit 113. The first clock adjustment circuit 115 is configured to control the operation mode of the foregoing circuit. In operation, the first control circuit 117 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 117 also uses the first packet parsing circuit 113 to analyze the packets received by the first Bluetooth communication circuit 111 to obtain relevant data or instructions.

In the secondary Bluetooth circuit 120, the second Bluetooth communication circuit 121 can be used for data communication with other Bluetooth devices. The second packet analysis circuit 123 can be used to analyze the Bluetooth packet received by the second Bluetooth communication circuit 121. The second clock adjustment circuit 125 is coupled to the second packet parsing circuit 123 and can be used to adjust the internal 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 127 is coupled to the second Bluetooth communication circuit 121, the second packet analysis circuit 123, and the second clock adjustment circuit 125, and is configured to control the operation of the aforementioned circuits. In operation, the second control circuit 127 can communicate data with other Bluetooth devices through the second Bluetooth communication circuit 121 in a Bluetooth wireless transmission mode, and communicate data with other member circuits through the second Bluetooth communication circuit 121. The second control circuit 127 also uses the second packet analysis circuit 123 to parse the packet received by the second Bluetooth communication circuit 121 to obtain related data or instructions.

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 113 and the second packet analysis circuit 123 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 115 and second clock adjustment circuit 125 can be implemented by various suitable circuits that can compare and adjust the clock frequency and/or clock phase, for example, various phase-locked loops (phase-locked loops). locked loop, PLL) or delay-locked loop (DLL) and so on. The aforementioned first control circuit 117 and second control circuit 127 are both It can be implemented with various microprocessors or digital signal processing circuits with appropriate computing capabilities.

In some embodiments, the first clock adjustment circuit 115 or the second clock adjustment circuit 125 may also be integrated into the first control circuit 117 or the second control circuit 127. In addition, the aforementioned first packet analysis circuit 113 and the second packet analysis circuit 123 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 113 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 123 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 can be integrated into a single Bluetooth controller IC. Similarly, all the functional blocks in the secondary Bluetooth circuit 120 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 source. A packet sent by the 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 "main Bluetooth circuit" referred to in the specification and the scope of the patent application and The two terms "secondary Bluetooth circuit" are just for the convenience of distinguishing that the ways in which different member circuits receive packets from the source Bluetooth device 102 are different. It does not mean that the main Bluetooth circuit 110 has certain aspects of other operations of the secondary Bluetooth circuit 120. A degree of control authority.

Hereinafter, the operation mode of the multi-member Bluetooth device 100 will be further explained in conjunction with FIGS. FIG. 2 is a simplified flowchart of an embodiment of the internal clock generation method adopted by the multi-member Bluetooth device 100. 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, and the aforementioned logic is also applicable to other subsequent flow charts.

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 a process 202 to establish a first Bluetooth as shown in FIG. 3 by using various methods that comply with the Bluetooth communication standards. Microgrid 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 the first main clock CLK_P1M, and schedules the Bluetooth in the first Bluetooth piconet 310 according to the first main clock CLK_P1M. The timing of packet transmission or reception. 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 the process 206, the source Bluetooth device 102 generates and transmits 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 208, the first Bluetooth communication circuit 111 receives the first piconet timing packet generated by the source Bluetooth device 102 through the first Bluetooth picone 310, and sends it to the first control circuit 117.

In the process 210, the first control circuit 117 controls the first packet parsing circuit 113 to obtain the aforementioned first main clock CLK_P1M timing data, such as related count values, from the first piconet timing packet.

In the process 212, the first control circuit 117 controls the first clock adjustment circuit 115 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, as The slave clock in the first Bluetooth piconet 310. For example, the first control circuit 117 can control the first clock adjustment circuit 115 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 operation, the first control circuit 117 can control the first Bluetooth communication circuit 111 to schedule the transmission or connection of Bluetooth packets in the first Bluetooth piconet 310 according to the first slave clock CLK_P1S1. Receiving timing.

In the process 214, 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 the process 214, 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 216, the first control circuit 117 controls the first clock adjustment circuit 115 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 A second main clock CLK_P2M. For example, the first control circuit 117 can control the first clock adjustment circuit 115 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.

The first control circuit 117 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.

As can be seen from the foregoing description, the first slave clock CLK_P1S1 and the second master clock CLK_P2M generated by the first clock adjustment circuit 115 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 117 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 the process 218, the first control circuit 117 generates a second piconet timing packet containing the timing data of the second main clock CLK_P2M, and uses the first Bluetooth communication circuit 111 to transmit the second piconet timing packet to the second Bluetooth piconet 320. In practice, the first control circuit 117 can use various suitable data as the timing data of the second main clock CLK_P2M. For example, the first control circuit 117 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 220, the second Bluetooth communication circuit 121 receives the second piconet timing packet generated by the main Bluetooth circuit 110 through the second Bluetooth picone 320, and sends it to the second control circuit 127.

In the process 222, the second control circuit 127 controls the second packet parsing circuit 123 to obtain the aforementioned second main clock CLK_P2M timing data, for example, the related count value, from the second piconet timing packet.

In the process 224, the second control circuit 127 controls the second clock adjustment circuit 125 to generate the 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, as The slave clock in the second Bluetooth piconet 320. For example, the second control circuit 127 can control the second clock adjustment circuit 125 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 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 addition, in the process 224, the second control circuit 127 can also control the second clock adjustment circuit 125 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 127 can control the second clock adjustment circuit 125 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, so as to generate the frequency substantially The third slave clock CLK_P2S1 of the second master clock CLK_P2M is the same as the second master clock CLK_P2M and substantially aligned in phase.

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 125 is also It is indirectly synchronized with the first main clock CLK_P1M generated by the source Bluetooth device 102. In this way, the secondary Bluetooth circuit 120 can receive the Bluetooth packet in the first Bluetooth piconet 310 without the source Bluetooth device 102 knowing.

As can be seen from the foregoing description, the second slave clock CLK_P2S1 and the third slave clock CLK_P1S2 generated by the second clock adjustment circuit 115 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 127 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 127 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 127 can also schedule the reception timing of the Bluetooth packet in the first Bluetooth piconet 310 according to the third slave clock CLK_P1S2 to sniffing the first Bluetooth packet. A Bluetooth packet in the Bluetooth piconet 310.

Hereinafter, the manner in which the secondary Bluetooth circuit 120 in the multi-member Bluetooth device 100 updates its internal clock will be further described in conjunction with FIGS. 4 to 5. 4 is a simplified flowchart of an embodiment of an internal clock update method adopted by the secondary Bluetooth circuit 120.

As shown in FIG. 4, the second control circuit 127 can then perform the process 402 and the process 404 to control the second Bluetooth communication circuit 121 to participate in the aforementioned packet transmission operation of the first Bluetooth piconet 310 and the second Bluetooth picone 320.

In the process 402, the second control circuit 127 can control the second Bluetooth communication circuit 121 to operate according to the second slave clock CLK_P2S1 to perform the Bluetooth packet transmission operation with the master Bluetooth circuit 110 in the second Bluetooth piconet 320.

In the process 404, the second control circuit 127 can control the second Bluetooth communication circuit 121 to operate according to the third slave clock CLK_P1S2 to sniff the Bluetooth packets sent by the source Bluetooth device 102 in the first Bluetooth piconet 310. In other words, even if the source Bluetooth device 102 does not establish any Bluetooth piconet with the secondary Bluetooth circuit 120, the secondary Bluetooth circuit 120 can operate according to the aforementioned third slave clock CLK_P1S2 to sniff the Bluetooth packets sent by the source Bluetooth device 102 .

As we all know, during the operation of the secondary Bluetooth circuit 120, the wireless signal environment of its Bluetooth communication may change over time due to various factors, and may also be affected by the user's posture and usage habits. If the internal clock of the secondary Bluetooth circuit 120 cannot be correctly synchronized with the corresponding piconet clock, the overall operating performance of the multi-member Bluetooth device 100 is easily reduced, and the standby time of the secondary Bluetooth circuit 120 may also be reduced. In some cases, it may also increase the heat and temperature of the secondary Bluetooth circuit 120, thereby shortening the service life of the secondary Bluetooth circuit 120, or reducing the comfort of the secondary Bluetooth circuit 120 (because the heat or temperature is too high may cause Cause discomfort to the user).

Therefore, the second control circuit 127 can intermittently perform the process 406 to detect the changes in the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the main Bluetooth circuit 110 according to the reception situation of the second Bluetooth communication circuit 121.

On the other hand, the second Bluetooth communication circuit 121 will continue to sniff the Bluetooth packets sent by the source Bluetooth device 102 and perform the process 408 intermittently.

In the process 408, the second Bluetooth communication circuit 121 receives the first piconet timing packet sent by the source Bluetooth device 102 in the first Bluetooth picone 310, and transmits it to the second control circuit 127.

In the process 410, the second control circuit 127 controls the second packet parsing circuit 123 to obtain the current timing data of the first main clock CLK_P1M from the first piconet timing packet received by the second Bluetooth communication circuit 121, For example, the relevant count value.

If the second control circuit 127 determines in the aforementioned process 406 that the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the main Bluetooth circuit 110 has deteriorated to more than a predetermined level, the process 412 will be performed.

In the process 412, the second control circuit 127 controls the second clock adjustment circuit 125 to correct the phase of the second slave clock CLK_P2S1 according to the current timing data of the first master clock CLK_P1M, so that the corrected second slave clock CLK_P2S1 The phase of the clock CLK_P2S1 is aligned with the phase of the current first main clock CLK_P1M.

According to the foregoing description, the second main clock CLK_P2M generated by the main Bluetooth circuit 110 is theoretically synchronized with the first main clock CLK_P1M generated by the source Bluetooth device 102. Therefore, the second control circuit 127 controls the second clock adjustment circuit 125 to correct the phase of the second slave clock CLK_P2S1 according to the current timing data of the first master clock CLK_P1M, which can not only make the corrected second slave clock CLK_P2S1 The phase of is aligned with the phase of the current first master clock CLK_P1M, which can also make the phase of the corrected second slave clock CLK_P2S1 indirectly aligned with the phase of the second master clock CLK_P2M.

In other words, when the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the primary Bluetooth circuit 110 deteriorates, the secondary Bluetooth circuit 120 can use the first master clock CLK_P1M generated by the source Bluetooth device 102 to correct the second slave clock CLK_P2S1. The phase enables the corrected second slave clock CLK_P2S1 to be synchronized with the second master clock CLK_P2M generated by the master Bluetooth circuit 110.

In this way, even if the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the main Bluetooth circuit 110 deteriorates, it can effectively avoid the occurrence of the second slave clock CLK_P2S1 in the secondary Bluetooth circuit 120 not being synchronized with the second master clock CLK_P2M The problem.

Please refer to FIG. 5, which shows a simplified flowchart of another embodiment of the internal clock update method adopted by the secondary Bluetooth circuit 120.

As shown in FIG. 5, the secondary Bluetooth circuit 120 may perform the process 506 intermittently in the process of sniffing the Bluetooth packet sent by the source Bluetooth device 102.

In the process 506, the second control circuit 127 can detect the change of the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the source Bluetooth device 102 according to the reception situation of the second Bluetooth communication circuit 121.

On the other hand, the second Bluetooth communication circuit 121 will also continue to perform Bluetooth packet transmission with the main Bluetooth circuit 110 in the second Bluetooth piconet 320, and perform the process 508 intermittently.

In the process 508, the second Bluetooth communication circuit 121 receives the second piconet timing packet sent by the main Bluetooth circuit 110 in the second Bluetooth picone 320, and transmits it to the second control circuit 127.

In the process 510, the second control circuit 127 controls the second packet parsing circuit 123 to obtain the current second main clock CLK_P2M timing data from the second piconet timing packet received by the second Bluetooth communication circuit 121, For example, the relevant count value.

If the second control circuit 127 determines in the aforementioned process 506 that the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the source Bluetooth device 102 has deteriorated to more than a predetermined level, the process 512 is performed.

In the process 512, the second control circuit 127 controls the second clock adjustment circuit 125 to correct the phase of the third slave clock CLK_P1S2 according to the current timing data of the second master clock CLK_P2M, so that the corrected third slave clock The phase of the clock CLK_P1S2 is aligned with the phase of the current second main clock CLK_P2M.

According to the foregoing description, the second main clock CLK_P2M generated by the main Bluetooth circuit 110 is theoretically synchronized with the first main clock CLK_P1M generated by the source Bluetooth device 102. Therefore, the second control circuit 127 controls the second clock adjustment circuit 125 to correct the phase of the third slave clock CLK_P1S2 according to the current timing data of the second master clock CLK_P2M, which can not only make the corrected third slave clock CLK_P1S2 The phase of is aligned with the phase of the current second master clock CLK_P2M, which can also make the phase of the corrected third slave clock CLK_P1S2 indirectly aligned with the phase of the first master clock CLK_P1M.

In other words, when the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the source Bluetooth device 102 deteriorates, the secondary Bluetooth circuit 120 can use the second master clock CLK_P2M generated by the master Bluetooth circuit 110 to correct the third slave clock CLK_P1S2. The phase enables the corrected third slave clock CLK_P1S2 to be synchronized with the first master clock CLK_P1M generated by the source Bluetooth device 102.

In this way, even if the Bluetooth wireless signal environment between the secondary Bluetooth circuit 120 and the source Bluetooth device 102 deteriorates, it can effectively prevent the third slave clock CLK_P1S2 in the secondary Bluetooth circuit 120 from being in sync with the first master clock CLK_P1M. The problem.

In practice, the secondary Bluetooth circuit 120 can perform the internal clock update method of FIG. 4 or FIG. 5 alone, or perform the internal clock update method of FIG. 4 and FIG. 5 at the same time.

It can be seen from the foregoing description that even if the wireless signal environment of the secondary Bluetooth circuit 120 in a certain Bluetooth piconet deteriorates, the clock generated by other Bluetooth devices or Bluetooth circuits can be used to correct the internal clock used in other Bluetooth piconets. In this way, the internal clock of the secondary Bluetooth circuit 120 can be correctly synchronized with the corresponding microgrid clock, thereby improving the overall operating performance of the multi-member Bluetooth device 100 and increasing the standby time of the secondary Bluetooth circuit 120. In some cases, the calorific value and temperature of the secondary Bluetooth circuit 120 can be reduced, thereby prolonging the service life of the secondary Bluetooth circuit 120 or improving the comfort of using the secondary Bluetooth circuit 120.

Please note that the execution sequence of the processes in FIG. 4 and FIG. 5 is only an exemplary embodiment, and does not limit the actual implementation of the present invention. For example, in some embodiments, the process 406 in FIG. 4 may be omitted. In some embodiments, the process 506 in FIG. 5 may be omitted.

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 115 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 125 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.

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 of "and/or" used in the manual 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

113: The first packet analysis circuit

115: The first clock adjustment circuit

117: The first control circuit

120: Secondary Bluetooth circuit

121: The second Bluetooth communication circuit

123: The second packet analysis circuit

125: Second clock adjustment circuit

127: second control circuit

Claims (8)

A secondary Bluetooth circuit (120) 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 a main Bluetooth circuit (110) and the A secondary Bluetooth circuit (120), the source Bluetooth device (102) acts as a master device (master) in a first Bluetooth piconet (310), and the main Bluetooth circuit (110) acts as the first Bluetooth piconet (310) A slave device (slave) in a second Bluetooth piconet (320) plays a role of a master device in a second Bluetooth piconet (320), the master Bluetooth circuit (110) will be based on a first master time generated by the source Bluetooth device (102) Pulse (CLK_P1M), which generates a first slave clock (CLK_P1S1) and a second master clock with the same frequency as the first master clock (CLK_P1M) and phase aligned with the first master clock (CLK_P1M) (CLK_P2M), the secondary Bluetooth circuit includes: a second Bluetooth communication circuit (121); a second packet analysis circuit (123) configured to analyze the packets received by the second Bluetooth communication circuit (121); a second Clock adjustment circuit (125); and a second control circuit (127), coupled to the second Bluetooth communication circuit (121), the second packet analysis circuit (123), and the second clock adjustment circuit ( 125), configured to control the secondary Bluetooth circuit (120) to act as a slave device in the second Bluetooth piconet (320); wherein, the second control circuit (127) is also configured to perform the following operations: according to the second The timing data of the master clock (CLK_P2M) controls the second clock adjustment circuit (125) to generate a second slave clock (CLK_P2S1) and a third slave clock that are synchronized with the second master clock (CLK_P2M) Pulse (CLK_P1S2); and controlling the second Bluetooth communication circuit (121) to operate according to the third slave clock (CLK_P1S2) to sniff the source Bluetooth device (102) in the first Bluetooth piconet (310) Bluetooth packets sent. The secondary Bluetooth circuit (120) according to claim 1, wherein the second Bluetooth communication circuit (121) A second piconet timing packet containing timing data of the second master clock (CLK_P2M) generated by the master Bluetooth circuit (110) will be received, and the second packet parsing circuit (123) will receive the timing data from the second master clock (CLK_P2M). The timing data of the second main clock (CLK_P2M) is obtained in the second piconet timing packet. The secondary Bluetooth circuit (120) according to claim 2, wherein the second control circuit (127) controls the second clock adjustment circuit (125) according to the timing data of the second main clock (CLK_P2M) Generate the second slave clock (CLK_P2S1) with the same frequency as the second master clock (CLK_P2M) and phase-aligned with the second master clock (CLK_P2M), and generate the second slave clock (CLK_P2S1) with the same frequency as the first master clock The third slave clock (CLK_P1S2) whose pulses (CLK_P1M) are the same and aligned in phase with the first master clock (CLK_P1M). The secondary Bluetooth circuit (120) according to claim 1, wherein the second control circuit (127) also controls the second Bluetooth communication circuit (121) to operate according to the second slave clock (CLK_P2S1) to The Bluetooth packet transmission operation is performed with the main Bluetooth circuit (110) in the second Bluetooth piconet (320). The secondary Bluetooth circuit (120) according to claim 4, wherein the second control circuit (127) is also based on the timing data of the first primary clock (CLK_P1M) currently generated by the source Bluetooth device (102) , Controlling the second clock adjustment circuit (125) to correct the phase of the second slave clock (CLK_P2S1) so that the phase of the corrected second slave clock (CLK_P2S1) is aligned with the master Bluetooth circuit (110) The currently generated second main clock (CLK_P2M). The secondary Bluetooth circuit (120) according to claim 4, wherein the second control circuit (127) is further configured to perform the following operations: detecting the connection between the secondary Bluetooth circuit (120) and the main Bluetooth circuit (110) The Bluetooth wireless signal environment changes; and if the Bluetooth wireless signal environment between the secondary Bluetooth circuit (120) and the main Bluetooth circuit (110) deteriorates to more than a predetermined level, based on the current status of the source Bluetooth device (102) The generated timing data of the first master clock (CLK_P1M) controls the second clock adjustment circuit (125) to correct the phase of the second slave clock (CLK_P2S1) to The phase of the corrected second slave clock (CLK_P2S1) is aligned with the second master clock (CLK_P2M) currently generated by the master Bluetooth circuit (110). The secondary Bluetooth circuit (120) according to claim 4, wherein the second control circuit (127) is also based on the timing data of the second primary clock (CLK_P2M) currently generated by the primary Bluetooth circuit (110) , Controlling the second clock adjustment circuit (125) to correct the phase of the second slave clock (CLK_P2S1) so that the phase of the second slave clock (CLK_P2S1) after correction is aligned with the source Bluetooth device (102) The currently generated first main clock (CLK_P1M). The secondary Bluetooth circuit (120) according to claim 4, wherein the second control circuit (127) is further configured to perform the following operations: detecting the connection between the secondary Bluetooth circuit (120) and the source Bluetooth device (102) Changes in the Bluetooth wireless signal environment; and if the Bluetooth wireless signal environment between the secondary Bluetooth circuit (120) and the source Bluetooth device (102) deteriorates to more than a predetermined level, based on the current status of the main Bluetooth circuit (110) The generated timing data of the second master clock (CLK_P2M) controls the second clock adjustment circuit (125) to correct the phase of the second slave clock (CLK_P2S1) so that the corrected second slave clock ( The phase of CLK_P2S1) is aligned with the first main clock (CLK_P1M) currently generated by the source Bluetooth device (102).

Images