CN112788737A - Multi-member blue-tooth device capable of making audio-frequency playing of different blue-tooth circuit keep synchronous - Google Patents
Multi-member blue-tooth device capable of making audio-frequency playing of different blue-tooth circuit keep synchronous Download PDFInfo
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
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Abstract
The invention provides a multi-member Bluetooth device which can keep the audio playing of different Bluetooth circuits synchronous, and is used for carrying out data transmission with a source Bluetooth device, and the source Bluetooth device is used as a main device of a first Bluetooth microgrid. The multi-member Bluetooth device comprises a main Bluetooth circuit and an auxiliary Bluetooth circuit. The master bluetooth circuit acts as a slave to the first bluetooth piconet and as a master to the second bluetooth piconet. The secondary bluetooth circuit acts as a slave to the second bluetooth piconet. The master Bluetooth circuit generates a first slave clock and a second master clock which are synchronous with a first master clock generated by the source Bluetooth device, and samples first audio data to be played according to a first audio sampling clock. The auxiliary Bluetooth circuit generates a second slave clock synchronous with the second master clock, and samples second audio data to be played according to the second audio sampling clock.
Description
Technical Field
The present invention relates to bluetooth technology, and more particularly, to a multi-member bluetooth device capable of synchronizing audio playback of different bluetooth circuits.
Background
The multi-member bluetooth device refers to a bluetooth device composed of a plurality of bluetooth circuits used in combination with each other, for example, a pair of bluetooth headsets, a set of bluetooth stereos, and the like. When a multi-member bluetooth device is online with other bluetooth devices (hereinafter referred to as remote bluetooth devices), the remote bluetooth device treats the multi-member bluetooth device as a single bluetooth device.
Many conventional multi-member bluetooth devices have audio playback capabilities. In many applications, different bluetooth circuits may be used to cooperatively play audio data to create stereo or surround sound effects. However, if the audio playback operations of the different bluetooth circuits in the multi-member bluetooth device are not synchronized with each other, it will bring users a poor experience, thereby reducing the application value and usage flexibility of the multi-member bluetooth device.
Disclosure of Invention
In view of this, how to keep the audio playback of different bluetooth circuits in the multi-member bluetooth device synchronized is a problem to be solved.
The present specification provides embodiments of a multi-member bluetooth device for data transmission with a source bluetooth device that serves as a master device in a first bluetooth piconet. The multi-member bluetooth device includes: a master bluetooth circuit, comprising: a first bluetooth communication circuit; a first clock adjusting circuit; a first control circuit, coupled to the first bluetooth communication circuit and the first clock adjustment circuit, configured to control the master bluetooth circuit to act as a slave device in the first bluetooth piconet and to act as a master device in a second bluetooth piconet; a first sampling clock adjusting circuit coupled to the first control circuit; and a first asynchronous sampling rate conversion circuit, coupled to the first sampling clock adjustment circuit, configured to sample a first audio data according to a first audio sampling clock, and transmit the sampled data to a first playback circuit for playback; and a set of bluetooth circuitry comprising: a second bluetooth communication circuit; a second clock adjusting circuit; a second control circuit, coupled to the second bluetooth communication circuit and the second clock adjustment circuit, configured to control the sub-bluetooth circuit to act as a slave device in the second bluetooth piconet; a second sampling clock adjusting circuit coupled to the second control circuit; and a second asynchronous sampling rate conversion circuit, coupled to the second sampling clock adjustment circuit, configured to sample a second audio data according to a second audio sampling clock, and transmit the sampled data to a second playback circuit for playback; wherein the first control circuit is further configured to: controlling the first clock adjusting circuit to generate a first slave clock and a second master clock which are synchronous with the first master clock according to the time sequence data of the first master clock generated by the source Bluetooth device; and controlling the first bluetooth communication circuit to transmit or receive packets in the first bluetooth piconet according to the first slave clock, and controlling the first bluetooth communication circuit to transmit or receive packets in the second bluetooth piconet according to the second master clock; wherein the second control circuit is further configured to: controlling the second clock adjusting circuit to generate a second slave clock synchronous with the second master clock according to the time sequence data of the second master clock; and controlling the second bluetooth communication circuit to transmit or receive packets in the second bluetooth piconet according to the second slave clock.
One of the advantages of the above embodiments is that the master bluetooth circuit synchronizes the first slave clock and the second master clock therein with the first master clock determined by the source bluetooth device, so that the first clock adjusting circuit can be implemented with a simplified circuit structure.
Another advantage of the foregoing embodiment is that the first slave clock and the second master clock used by the master bluetooth circuit are both synchronous with the first master clock, thereby effectively improving the bluetooth bandwidth utilization efficiency of the master bluetooth circuit.
Another advantage of the foregoing embodiment is that the second slave clock used by the secondary bluetooth circuit is synchronized with the second master clock, and is also indirectly synchronized with the first master clock, so that the bluetooth bandwidth utilization efficiency of the secondary bluetooth circuit can be effectively improved.
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 primary bluetooth circuit, so that the audio playing operation of the second playback circuit is also synchronized with the audio playing operation of the first playback circuit.
Other advantages of the present invention will be described in more detail with reference to the following description and drawings.
Drawings
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 a method for synchronizing audio playback operations of different Bluetooth circuits according to an embodiment of the present invention.
Fig. 3 is a simplified schematic diagram of the multi-member bluetooth device of fig. 1 forming a star network according to an embodiment.
FIG. 4 is a simplified flowchart of another embodiment of a method for synchronizing audio playback operations of different Bluetooth circuits according to the present invention.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, like reference numerals designate identical or similar components or process 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 (member circuits). For convenience of explanation, only two member circuits, a primary bluetooth circuit 110 and a secondary bluetooth circuit 120, are shown in the embodiment of fig. 1.
In the embodiment, all the member circuits in the multi-member bluetooth device 100 have similar main circuit structures, but different additional circuit components may be disposed in different member circuits, without limitation, the circuit structures of all the member circuits are all the same. For example, as shown in fig. 1, the master bluetooth circuit 110 includes a first bluetooth communication circuit 111, a first packet parsing circuit 112, a first clock adjusting circuit 113, a first control circuit 114, a first buffer circuit 115, a first sampling clock adjusting circuit 116, a first asynchronous sampling rate conversion circuit 117, and a first playback circuit 118. Similarly, the sub-bluetooth circuit 120 includes a second bluetooth communication circuit 121, a second packet parsing circuit 122, a second clock adjusting circuit 123, a second control circuit 124, a second buffer circuit 125, a second sampling clock adjusting circuit 126, a second asynchronous sampling rate conversion circuit 127, and a second playback circuit 128.
In the master bluetooth circuit 110, a first bluetooth communication circuit 111 is provided for data communication with other bluetooth devices. The first packet parsing circuit 112 is configured to parse the bluetooth packets received by the first bluetooth communication circuit 111. The first clock adjustment circuit 113 is configured to adjust a portion of the operating clock signal of the master bluetooth circuit 110 to synchronize a piconet clock (piconet clock) used between the master bluetooth circuit 110 and other bluetooth devices.
The first control circuit 114 is coupled to the first bluetooth communication circuit 111, the first packet parsing circuit 112, and the first clock adjusting circuit 113, and configured to control operation modes of the aforementioned circuits. In operation, the first control circuit 114 can communicate data directly with the source bluetooth device 102 via the first bluetooth communication circuit 111 via bluetooth wireless transmission, and communicate data with other member circuits via 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 the related data or command.
The first buffer circuit 115 can be used for storing audio data to be played (hereinafter referred to as first audio data). In practice, the first audio data may be audio data pre-stored in the first buffer circuit 115 by a manufacturer or a user, audio data transmitted from the source bluetooth device 102, audio data transmitted from other bluetooth circuits (e.g., the secondary bluetooth circuit 120), or audio data transmitted from other circuits.
The first sampling clock adjusting circuit 116 is coupled to the first control circuit 114 and configured to generate the first audio sampling clock according to the control of the first control circuit 114.
The first asynchronous sample rate conversion circuit 117 is coupled to the first sampling clock adjustment circuit 116 and the first playback circuit 118, and is configured to sample the first audio data in the first buffer circuit 115 according to the first audio sampling clock, and transmit the sampled data to the first playback circuit 118 for playback.
In the sub bluetooth circuit 120, a second bluetooth communication circuit 121 is provided for data communication with other bluetooth devices. The second packet parsing circuit 122 is configured to parse the bluetooth packets received by the second bluetooth communication circuit 121. The second clock adjusting circuit 123 is configured to adjust a portion of the operating clock signal of the secondary bluetooth circuit 120 to synchronize the piconet 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 parsing circuit 122, and the second clock adjusting circuit 123, and configured to control the operation of the aforementioned circuits. In operation, the second control circuit 124 can communicate data with other bluetooth devices via the second bluetooth communication circuit 121 via bluetooth wireless transmission, and communicate data with other member circuits via the second bluetooth communication circuit 121. The second control circuit 124 also uses the second packet parsing circuit 122 to parse the packet received by the second bluetooth communication circuit 121 to obtain the related data or command.
The second buffer circuit 125 can be used for storing audio data to be played (hereinafter referred to as second audio data). In practice, the second audio data may be audio data pre-stored in the second buffer circuit 125 by a manufacturer or a user, audio data transmitted from the source bluetooth device 102, audio data transmitted from other bluetooth circuits (e.g., the master bluetooth circuit 110), or audio data transmitted from other circuits.
The second sampling clock adjusting circuit 126 is coupled to the second control circuit 124 and configured to generate the second audio sampling clock according to the control of the second control circuit 124.
The second asynchronous sample rate conversion circuit 127 is coupled to the second sampling clock adjustment circuit 126 and the second playback circuit 128, and is configured to sample the second audio data in the second buffer circuit 125 according to the second audio sampling clock, and transmit the sampled data to the second playback circuit 128 for playback.
In practice, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may be implemented by suitable wireless communication circuits capable of supporting various versions of bluetooth communication protocols. The first packet parsing Circuit 112 and the second packet parsing Circuit 122 can be implemented by various packet demodulation circuits, digital operation circuits, microprocessors, or Application Specific Integrated Circuits (ASICs). The first clock adjusting circuit 113, the second clock adjusting circuit 123, the first sampling clock adjusting circuit 116, and the second sampling clock adjusting circuit 126 can be implemented by various suitable circuits capable of comparing and adjusting clock frequency and/or clock phase, such as various phase-locked loops (PLLs), delay-locked loops (DLLs), and so on. The 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 first buffer circuit 115 and the second buffer circuit 125 can be implemented by various volatile storage circuits or non-volatile storage circuits. The first asynchronous sample rate conversion circuit 117 and the second asynchronous sample rate conversion circuit 127 can be implemented by various suitable digital circuits, analog circuits, or mixed digital and analog circuits. The first playback circuit 118 and the 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 adjusting circuit 113 or the second clock adjusting circuit 123 may be integrated into the first control circuit 114 or the second control circuit 124, or the first sampling clock adjusting circuit 116 or the second sampling clock adjusting circuit 126 may be integrated into the first control circuit 114 or the second control circuit 124. In addition, the first packet parsing circuit 112 and the second packet parsing circuit 122 may be integrated into the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121, respectively.
In other words, the first bluetooth communication circuit 111 and the first packet parsing circuit 112 may be implemented by different circuits, or may be implemented by the same circuit. Similarly, the second bluetooth communication circuit 121 and the second packet parsing circuit 122 may be implemented by different circuits, or may be implemented by the same circuit.
When applied, the different functional blocks in the main bluetooth circuit 110 may also be integrated into a single circuit chip. For example, all functional blocks in the main Bluetooth circuit 110 or other functional blocks except the first playback circuit 118 may be integrated into a single Bluetooth control chip (Bluetooth controller IC). Similarly, all the functional blocks in the secondary bluetooth circuit 120 or other functional blocks except the second playback circuit 128 may also be integrated into another single bluetooth control chip.
In practice, the multi-member bluetooth device 100 may be used to implement a bluetooth device used by multiple member circuits in combination with each other, such as paired bluetooth headsets, grouped bluetooth speakers, etc. The source bluetooth device 102 can be implemented by various electronic devices with bluetooth communication functions, such as a computer, a mobile phone, a tablet, a smart speaker, a game console, and the like.
As can be seen from the foregoing description, different member circuits in the multi-member bluetooth device 100 can perform data communication with each other through their respective bluetooth communication circuits to form various types of bluetooth networks. When the multi-member bluetooth device 100 is in data communication with the originating bluetooth device 102, the originating bluetooth device 102 treats the multi-member bluetooth device 100 as a single bluetooth device.
The master bluetooth circuit 110 may receive packets from the source bluetooth device 102 by various known mechanisms, and the slave bluetooth circuit 120 may obtain packets from the source bluetooth device 102 by using an appropriate mechanism during the operation of the master bluetooth circuit 110.
For example, during the process of receiving the packets sent by the source bluetooth device 102 by the primary bluetooth circuit 110, the secondary bluetooth circuit 120 may operate in a sniffing mode (sniffing mode) to actively sniff the packets sent by the source bluetooth device 102. Alternatively, the secondary bluetooth circuit 120 may operate in a relay mode to passively receive only packets forwarded by the primary bluetooth circuit 110 after receiving the packets sent by the source bluetooth device 102, but not actively sniff the packets sent by the source bluetooth device 102.
It should be noted that the terms "master bluetooth circuit" and "slave bluetooth circuit" are used throughout the specification and the claims only for the convenience of distinguishing the different types of packets received from the source bluetooth device 102, and do not indicate whether the master bluetooth circuit 110 has a certain degree of control authority over the other operation planes of the slave bluetooth circuit 120. In practice, the roles used by the primary bluetooth circuit 110 and the secondary bluetooth circuit 120 may be interchanged intermittently, periodically, or if certain conditions are met.
The operation of the multi-member bluetooth device 100 will be further described with reference to fig. 2 to 3. FIG. 2 is a simplified flowchart of a method for synchronizing audio playback operations of different Bluetooth circuits according to an embodiment of the present invention. Fig. 3 is a simplified schematic diagram of an embodiment in which the multi-member bluetooth device 100 forms a star network (scatter net).
In the flowchart of fig. 2, the flow in the field to which a specific device belongs represents the flow performed by the specific device. For example, the portion marked in the "source bluetooth device" field is the flow performed by the source bluetooth device 102; the part marked in the "master bluetooth circuit" field is the flow performed by the master bluetooth circuit 110; the portion marked in the "secondary bluetooth circuit" field is the flow 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 master bluetooth circuitry 110 of the multi-member bluetooth device 100 and the originating bluetooth device 102 proceed to process 202 to establish the first bluetooth piconet 310 as shown in fig. 3 in a manner that is compliant with various specifications of the bluetooth communication standard. In the process 202, the originating bluetooth device 102 may act as a master (master) in the first bluetooth piconet 310, while the master bluetooth circuit 110 of the multi-member bluetooth device 100 may act as a slave (slave) in the first bluetooth piconet 310.
In the process 204, the originating bluetooth device 102 generates a first master clock CLK _ P1M and schedules (schedule) transmission or reception of bluetooth packets in the first bluetooth piconet 310 according to the first master clock CLK _ P1M. Therefore, the first master clock CLK _ P1M is not only the original system clock (native system clock) of the source bluetooth device 102, but also the master clock (master clock) in the first bluetooth piconet 310.
In addition, the source bluetooth device 102 may generate and transmit a first piconet timing packet including timing data of the first master clock CLK _ P1M to the first bluetooth piconet 310. In practice, the source bluetooth device 102 may utilize various suitable data as the timing data of the first master clock CLK _ P1M. For example, the source bluetooth device 102 may use a count value (count value) of a specific edge (e.g., rising edge) of the first master clock CLK _ P1M as timing data of the first master clock CLK _ P1M, and write the count value corresponding to the first master clock CLK _ P1M into a frequency hopping synchronization packet (FHS packet) to form the first piconet timing packet.
In the process 206, the master bluetooth circuit 110 may generate a first slave clock CLK _ P1S1 synchronized with the first master clock CLK _ P1M as a slave clock (slave clock) in the first bluetooth piconet 310 according to the timing data of the first master clock CLK _ P1M. In operation, the first bluetooth communication circuit 111 may receive the first piconet timing packet generated by the source bluetooth device 102 via the first bluetooth piconet 310, and the first control circuit 114 may control the first packet parsing circuit 112 to obtain timing data, e.g., a related count value, of the first master clock CLK _ P1M from the first piconet timing packet.
Then, the first control circuit 114 may control the first clock adjusting 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 may control the first clock adjusting circuit 113 to adjust the frequency and/or the phase offset of a first reference clock CLK _ R1 according to the timing data of the first master clock CLK _ P1M to generate a first slave clock CLK _ P1S1 having a frequency substantially the same as the first master clock CLK _ P1M and a phase substantially aligned with the first master clock CLK _ P1M. In practice, the aforementioned first reference clock CLK _ R1 may be generated by various suitable clock generation circuits located inside or outside the master bluetooth circuit 110.
In operation, the first control circuit 114 may control the first bluetooth communication circuit 111 to schedule transmission or reception of bluetooth packets in the first bluetooth piconet 310 according to the first slave clock CLK _ P1S 1.
In the process 208, the primary bluetooth circuit 110 and the secondary bluetooth circuit 120 of the multi-member bluetooth device 100 may establish the second bluetooth piconet 320 as shown in fig. 3 by using various methods conforming to the bluetooth communication standard. In this embodiment, the master bluetooth circuit 110 may be used as a master in the second bluetooth piconet 320, and the slave bluetooth circuit 120 may be used as a slave in the second bluetooth piconet 320.
In other words, the master bluetooth circuit 110 may belong not only to the first bluetooth piconet 310 as described above, but also to the second bluetooth piconet 320.
In the process 210, the first control circuit 114 controls the first clock adjusting circuit 113 to generate the second master clock CLK _ P2M synchronized with the first master clock CLK _ P1M according to the timing data of the first master clock CLK _ P1M or the timing data of the first slave clock CLK _ P1S 1. For example, the first control circuit 114 may control the first clock adjusting circuit 113 to adjust the frequency and/or phase shift of the first reference clock CLK _ R1 according to the timing data of the first master clock CLK _ P1M or the timing data of the first slave clock CLK _ P1S1 to generate the second master clock CLK _ P2M having a frequency substantially the same as the first master clock CLK _ P1M and a phase substantially aligned with the first master clock CLK _ P1M.
In operation, the first control circuit 114 may control the first bluetooth communication circuit 111 to schedule transmission or reception of bluetooth packets in the second bluetooth piconet 320 according to the second master clock CLK _ P2M. Therefore, the second master clock CLK _ P2M is not only the original system clock (native system clock) of the master bluetooth circuit 120, but also the master clock (master clock) in 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 adjusting circuit 113 are both synchronized with the first master clock CLK _ P1M generated by the source Bluetooth device 102. That is, the frequencies of 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 thereof are substantially aligned with the first master clock CLK _ P1M.
In practice, the first control circuit 114 can respectively give the first slave clock CLK _ P1S1 and the second master clock CLK _ P2M different count values.
The aforementioned way of synchronizing the first slave clock CLK _ P1S1 and the second master clock CLK _ P2M inside 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 may further generate a second piconet timing packet including timing data of the second master clock CLK _ P2M, and transmit the second piconet timing packet to the second bluetooth piconet 320 by using the first bluetooth communication circuit 111. In practice, the first control circuit 114 may utilize various suitable data as the timing data of the second master clock CLK _ P2M. For example, the first control circuit 114 may utilize the count value of a specific edge (e.g., rising edge) of the second master clock CLK _ P2M as the timing data of the second master clock CLK _ P2M, and write the count value corresponding to the second master clock CLK _ P2M into a frequency hopping synchronization packet to form the second piconet timing packet.
In the process 212, the secondary bluetooth circuit 120 may generate a second slave clock CLK _ P2S1 synchronized with the second master clock CLK _ P2M as a slave clock of the second bluetooth piconet 320 according to the timing data of the second master clock CLK _ P2M. In operation, the second bluetooth communication circuit 121 may receive the second piconet timing packet generated by the master bluetooth circuit 110 via the second bluetooth piconet 320, and the second control circuit 124 may control the second packet parsing circuit 122 to obtain timing data, such as a related count value, of the second master clock CLK _ P2M from the second piconet timing packet.
Then, the second control circuit 124 controls the second clock adjusting circuit 123 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. For example, the second control circuit 124 may control the second clock adjusting circuit 123 to adjust the frequency and/or the phase offset of a second reference clock CLK _ R2 according to the timing data of the second master clock CLK _ P2M to generate a second slave clock CLK _ P2S1 having substantially the same frequency as the second master clock CLK _ P2M and substantially aligned in phase with the second master clock CLK _ P2M. In practice, the aforementioned second reference clock CLK _ R2 may be generated by various suitable clock generation circuits located inside or outside the secondary bluetooth circuit 120.
In addition, in the process 212, the second control circuit 124 may also control the second clock adjusting 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 may control the second clock adjusting circuit 123 to adjust the frequency and/or the phase offset of the second reference clock CLK _ R2 according to the timing data of the second master clock CLK _ P2M to generate a third slave clock CLK _ P1S2 having substantially the same frequency as the second master clock CLK _ P2M and substantially aligned in phase with 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 third slave clock CLK _ P1S2 generated by the second clock adjustment circuit 123 is also indirectly synchronized with the first master clock CLK _ P1M generated by the source Bluetooth device 102, such that the slave Bluetooth circuit 120 may utilize the third slave clock CLK _ P1S2 as a slave clock of the first Bluetooth piconet 310. In this way, the bluetooth packets in the first bluetooth piconet 310 may be received by the secondary bluetooth circuit 120 by sniffing (sniffing) without the source bluetooth device 102.
As can be seen from the above description, 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 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 the phases thereof are substantially aligned with the second master clock CLK _ P2M.
In practice, the second control circuit 124 may respectively give the aforementioned second slave clock CLK _ P2S1 and third slave clock CLK _ P1S2 different count values.
The aforementioned manner of synchronizing the second slave clock CLK _ P2S1 and the third slave clock CLK _ P1S2 inside the secondary bluetooth circuit 120 can effectively improve the bluetooth bandwidth utilization efficiency of the secondary bluetooth circuit 120.
Next, the second control circuit 124 controls the second bluetooth communication circuit 121 to schedule transmission or reception of bluetooth packets in the second bluetooth piconet 320 according to the second slave clock CLK _ P2S 1. In addition, the second control circuit 124 may schedule the bluetooth packets to be received in the first bluetooth piconet 310 according to the third slave clock CLK _ P1S2, so as 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 further performs the operations from the flow 214 to the flow 226, so as to keep the audio playback of the master bluetooth circuit 110 and the slave bluetooth circuit 120 synchronized.
In the process 214, the first control circuit 114 can control the first sampling clock adjusting circuit 116 to generate a first audio sampling clock CLK _ A1 synchronized with the first master clock CLK _ P1M, the first slave clock CLK _ P1S1, or the second master clock CLK _ P2M. In the embodiment, the first audio sampling clock CLK _ a1 is a clock signal for sampling the first audio data stored in the first buffer circuit 115, so the frequency of the first audio sampling clock CLK _ a1 is usually lower than the frequencies of the first master clock CLK _ P1M, the first slave clock CLK _ P1S1, and the second master clock CLK _ P2M, but the frequency of the first audio sampling clock CLK _ a1 is in a fixed relationship with the frequencies of the first master clock CLK _ P1M, the first slave clock CLK _ P1S1, or the second master clock CLK _ P2M.
For example, the first control circuit 114 may 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 master clock CLK _ P1M to generate the first audio sampling clock CLK _ A1 having a frequency substantially equal to the first master clock CLK _ P1M with a predetermined ratio and a phase substantially aligned with the first master clock CLK _ P1M.
For another example, the first control circuit 114 may 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 to generate the first audio sampling clock CLK _ a1 having a frequency substantially equal to the first slave clock CLK _ P1S1 with a predetermined multiplying factor and a phase substantially aligned with the first slave clock CLK _ P1S 1.
For another example, the first control circuit 114 may 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 master clock CLK _ P2M to generate the first audio sampling clock CLK _ A1 having a frequency substantially equal to the second master clock CLK _ P2M with a predetermined ratio and a phase substantially aligned with the second master clock CLK _ P2M.
In practice, the aforementioned first sampling clock CLK _ S1 may be generated by various suitable clock generation circuits located inside or outside the master bluetooth circuit 110.
In the process 216, the first asynchronous sample rate conversion circuit 117 samples 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 transmits the sampled audio data to the first playback circuit 118 for playback.
On the other hand, the secondary bluetooth circuit 120 also performs the processes 218 and 220 in fig. 2.
In the process 218, the second control circuit 124 may control the second sampling clock adjusting circuit 126 to generate a second audio sampling clock CLK _ A2 synchronized with the second master clock CLK _ P2M, the second slave clock CLK _ P2S1, or the third slave clock CLK _ P1S2 and having a frequency substantially the same as the first audio sampling clock CLK _ A1. In the present embodiment, the second audio sampling clock CLK _ a2 is a clock signal for sampling the second audio data stored in the second buffer circuit 125, so the frequency of the second audio sampling clock CLK _ a2 is generally lower than the frequencies of the second master clock CLK _ P2M, the second slave clock CLK _ P2S1 and the third slave clock CLK _ P1S2, but the frequency of the second audio sampling clock CLK _ a2 is in a fixed relationship with the frequencies of the second master clock CLK _ P2M, the second slave clock CLK _ P2S1 and the third slave clock CLK _ P1S 2.
For example, the second control circuit 124 may control the second sampling clock adjusting 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 master clock CLK _ P2M to generate the second audio sampling clock CLK _ A2 having a frequency substantially equal to the second master clock CLK _ P2M with a predetermined ratio and a phase substantially aligned with the second master clock CLK _ P2M.
For another example, the second control circuit 124 may control the second sampling clock adjusting circuit 126 to adjust the frequency and/or the phase offset of the second sampling clock CLK _ S2 according to the timing data of the second slave clock CLK _ P2S1 to generate the second audio sampling clock CLK _ a2 having a frequency substantially equal to the second slave clock CLK _ P2S1 with a predetermined multiplying factor and a phase substantially aligned with the second slave clock CLK _ P2S 1.
For another example, the second control circuit 124 may control the second sampling clock adjusting circuit 126 to adjust the frequency and/or phase shift of the second sampling clock CLK _ S2 according to the timing data of the third slave clock CLK _ P1S2 to generate the second audio sampling clock CLK _ A2 having a frequency substantially equal to the third slave clock CLK _ P1S2 with a predetermined magnification and a phase substantially aligned with the third slave clock CLK _ P1S 2.
In practice, the aforementioned second sampling clock CLK _ S2 may be generated by various suitable clock generation circuits located inside or outside the secondary bluetooth circuit 120.
In the process 220, the second asynchronous sample rate conversion circuit 127 under the control of the second control circuit 124 samples the second audio data stored in the second buffer circuit 125 according to the second audio sampling clock CLK _ a2, and transmits the sampled audio data to the second playback circuit 128 for playback.
As can be seen from the foregoing description, the first audio sampling clock CLK _ A1 generated by the master Bluetooth circuit 110 is 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 slave Bluetooth circuit 120 is synchronized with the second master clock CLK _ P2M, the second slave clock CLK _ P2S1, or the third slave clock CLK _ P1S 2. 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 synchronous and phase-aligned clock signals, the first audio sampling clock CLK _ A1 is also indirectly synchronous to the second audio sampling clock CLK _ A2 and is substantially phase-aligned to the second audio sampling clock CLK _ A2.
In this way, the audio playing operations of the master bluetooth circuit 110 and the slave bluetooth circuit 120 can be synchronized with each other without time delay. Therefore, the manner of generating the first audio sampling clock CLK _ a1 and the second audio sampling clock CLK _ a2 enables the audio playing operations of different bluetooth circuits to be synchronized with each other, creating an ideal stereo effect or surround effect, and bringing a good user experience to the user, thereby enhancing the application value and usage flexibility of the multi-member bluetooth device 100.
As can be seen from the foregoing description, the first audio sampling clock CLK _ A1 in the master Bluetooth circuit 110 is directly or indirectly generated according to the first reference clock CLK _ R1 and the first sampling clock CLK _ S1, and the second audio sampling clock CLK _ A2 in the slave Bluetooth circuit 120 is directly or indirectly generated according to the second reference clock CLK _ R2 and the second sampling clock CLK _ S2.
Generally, the first reference clock CLK _ R1 used by the master Bluetooth circuit 110 and the second reference clock CLK _ R2 used by the slave Bluetooth circuit 120 are clock signals generated independently of each other. In addition, the first sampling clock CLK _ S1 used by the master Bluetooth circuit 110 and the second sampling clock CLK _ S2 used by the slave Bluetooth circuit 120 are clock signals generated independently of each other.
Therefore, after the master bluetooth circuit 110 and the slave bluetooth circuit 120 are synchronized to play audio for a period of time, the first audio sampling clock CLK _ a1 in the master bluetooth circuit 110 and the second audio sampling clock CLK _ a2 in the slave bluetooth circuit 120 may have frequency and/or phase deviation therebetween.
If the first audio sampling clock CLK _ A1 of the master Bluetooth circuit 110 and the second audio sampling clock CLK _ A2 of the slave Bluetooth circuit 120 are not synchronized, the audio playback operations of the master Bluetooth circuit 110 and the slave Bluetooth circuit 120 are not synchronized, which can lead to poor user experience.
Therefore, in the present embodiment, the master bluetooth circuit 110 performs the process 222 intermittently during the process of playing the audio data, and the slave bluetooth circuit 120 performs the processes 224 and 226 intermittently during the process of playing the audio data.
In the process 222, the first control circuit 114 can transmit a first audio playing 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 may utilize the related count value (e.g., pulse count value, rising edge count value, falling edge count value, etc.) of the first audio sampling clock CLK _ a1 as the aforementioned first audio playing timing data, and transmit the first audio playing timing data to the secondary bluetooth circuit 120 through the first bluetooth communication circuit 111.
In the process 224, the second control circuit 124 can receive the first audio playing timing data from the master bluetooth circuit 110 through the second bluetooth communication circuit 121.
In the process 226, the second control circuit 124 controls the second sampling clock adjustment circuit 126 to correct the phase of the second audio sampling clock CLK _ a2 according to the first audio playing timing data (e.g., the related count value mentioned above) so that the corrected second audio sampling clock CLK _ a2 is synchronized with the current first audio sampling clock CLK _ a 1.
Therefore, the operations of the aforementioned processes 222 to 226 can effectively ensure that the audio playing operations of the main bluetooth circuit 110 and the sub bluetooth circuit 120 can be kept synchronized without the problem of time delay. Therefore, the main bluetooth circuit 110 and the auxiliary bluetooth circuit 120 can cooperatively perform audio playing operation to create an ideal stereo sound effect or surround sound effect, thereby maintaining good use experience and further improving the application value and use flexibility of the multi-member bluetooth device 100.
Please refer to fig. 4, which is a simplified flowchart illustrating a method for synchronizing audio playback operations of different bluetooth circuits according to another embodiment of the present invention.
The processes 202 to 220 in fig. 4 are the same as the corresponding processes in the embodiment of fig. 2. However, the embodiment of fig. 4 is different from the embodiment of fig. 2 in that the audio playing operations of the master bluetooth circuit 110 and the slave bluetooth circuit 120 can be kept synchronized.
As shown in fig. 4, the secondary bluetooth circuit 120 of the present embodiment performs the process 422 intermittently during the process of playing the audio data, and the primary bluetooth circuit 110 performs the processes 424 and 426 intermittently during the process of playing the audio data.
In the process 422, the second control circuit 124 can transmit a second audio playing timing sequence 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 may utilize the related count value (e.g., pulse count value, rising edge count value, falling edge count value, etc.) of the second audio sampling clock CLK _ a2 as the aforementioned second audio playing timing data, and transmit the second audio playing timing data to the master bluetooth circuit 110 through the second bluetooth communication circuit 121.
In the process 424, the first control circuit 114 can receive the second audio playing 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 playing timing data (e.g., the related count value mentioned above) such that the corrected first audio sampling clock CLK _ a1 is synchronized with the current second audio sampling clock CLK _ a 2.
Therefore, the operations of the aforementioned processes 422 to 426 also effectively ensure that the audio playing operations of the master bluetooth circuit 110 and the slave bluetooth circuit 120 can be kept synchronized without time delay. Therefore, the main bluetooth circuit 110 and the auxiliary bluetooth circuit 120 can cooperatively perform audio playing operation to create an ideal stereo sound effect or surround sound effect, thereby maintaining good use experience and further improving the application value and use flexibility of the multi-member bluetooth device 100.
In the multi-member bluetooth device 100, the master bluetooth circuit 110 synchronizes the first slave clock CLK _ P1S1 and the second master clock CLK _ P2M therein with the first master clock CLK _ P1M determined by the source bluetooth device 102, so that 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 of the master Bluetooth circuit 110 are synchronized with the first master clock CLK _ P1M, thereby effectively increasing the Bluetooth bandwidth utilization efficiency of the master Bluetooth circuit 110 and reducing the complexity of the master Bluetooth circuit 110 in updating the first slave clock CLK _ P1S1 and the second master clock CLK _ P2M.
Similarly, the slave bluetooth circuit 120 synchronizes the internal second slave clock CLK _ P2S1 and the third slave clock CLK _ P1S2 with the second master clock CLK _ P2M determined by the master bluetooth circuit 110, so that the second clock adjustment circuit 123 can be implemented with a simplified circuit structure.
In addition, the second slave clock CLK _ P2S1 and the third slave clock CLK _ P1S2 used by the slave bluetooth circuit 120 are both synchronized with the second master clock CLK _ P2M and are also equivalently synchronized with the first master clock CLK _ P1M, thereby effectively improving the efficiency of bluetooth bandwidth utilization of the slave bluetooth circuit 120 and reducing the complexity of the slave bluetooth circuit 120 in updating the second slave clock CLK _ P2S1 and the third slave clock CLK _ P1S 2.
More importantly, the second audio sampling clock CLK _ A2 used by the auxiliary Bluetooth circuit 120 is indirectly synchronized with the first audio sampling clock CLK _ A1 used by the main Bluetooth circuit 110, so that the audio playback operation of the second playback circuit 128 is also synchronized with the audio playback operation of the first playback circuit 118.
Please note that the number of the member circuits in the multi-member bluetooth device 100 is not limited to the two mentioned above, and can be expanded to a larger number according to the requirement.
In practice, the multi-member bluetooth device 100 can selectively adopt one of the two audio playing synchronization methods shown in fig. 2 and fig. 4 to ensure that the audio playing operations of the master bluetooth circuit 110 and the slave bluetooth circuit 120 can be kept synchronized. Alternatively, the multi-member bluetooth device 100 may alternatively adopt two methods to ensure that the audio playing operations of the master bluetooth circuit 110 and the slave bluetooth circuit 120 are continuously synchronized.
In addition, in some applications, the operation of the sub-bluetooth circuit 120 to generate the third slave clock CLK _ P1S2 may be omitted.
Certain terms are used throughout the description and claims to refer to particular components, and those skilled in the art may refer to the same components by different names. In the present specification and claims, the difference in name is not used as a means for distinguishing the components, but the difference in function of the components is used as a reference for distinguishing. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. Also, the term "coupled" is intended to include any direct or indirect connection. Therefore, if 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 or signal connection such as wireless transmission or optical transmission, or indirectly connected to the second element through other elements or connection means.
The description of "and/or" as used in this specification is inclusive of any combination of one or more of the listed items. In addition, any singular term shall include the plural unless the specification specifically states otherwise.
The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the present invention.
[ notation ] to show
Multi-member Bluetooth device (Multi-member Bluetooth device)
102.. Source Bluetooth device (source Bluetooth device)
A main Bluetooth circuit (main Bluetooth circuit)
A first Bluetooth communication circuit (first Bluetooth communication circuit)
A first packet parsing circuit (first packet parsing circuit)
A first clock adjusting circuit (first clock adjusting circuit)
A first control circuit (first control circuit)
A first buffer circuit (first buffer circuit)
A first sampling clock adjusting circuit (first sampling-clock adjusting circuit)
A first asynchronous sample rate conversion circuit (first asynchronous sample rate conversion circuit)
A first playback circuit (first playback circuit)
A secondary Bluetooth circuit (auxiliary Bluetooth circuit)
A second Bluetooth communication circuit (second Bluetooth communication circuit)
A second packet parsing circuit (second packet parsing circuit)
A second clock adjusting circuit (second clock adjusting circuit)
A second control circuit (second control circuit)
A second buffer circuit (second buffer circuit)
A second sampling clock adjusting circuit (second sampling-clock adjusting circuit)
A second asynchronous sample rate conversion circuit (second asynchronous sample rate conversion circuit)
A second playback circuit (second playback circuit)
202 to 226, 422 to 426
A first bluetooth piconet (first piconet)
A second bluetooth piconet (second piconet).
Claims (6)
1. A multi-member bluetooth device (100) for data transmission with a source bluetooth device (102), the source bluetooth device (102) acting as a master in a first bluetooth piconet (310), the multi-member bluetooth device (100) comprising:
a master bluetooth circuit (110), comprising:
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 master bluetooth circuit (110) to operate as a slave in the first bluetooth piconet (310) and as a master in a second bluetooth piconet (320);
a first sample clock adjustment circuit (116) coupled to the first control circuit (114); and
a first asynchronous sample rate conversion circuit (117), coupled to the first sampling clock adjustment circuit (116), configured to sample a first audio data according to a first audio sampling clock (CLK _ a1), and transmit the sampled first audio data to a first playback circuit (118) for playback; and
a set of bluetooth circuitry (120), comprising:
a second bluetooth communication circuit (121);
a second clock adjusting circuit (123);
a second control circuit (124), coupled to the second bluetooth communication circuit (121) and the second clock adjustment circuit (123), configured to control the secondary bluetooth circuit (120) to act as a slave in the second bluetooth piconet (320);
a second sample clock adjustment circuit (126) coupled to the second control circuit (124); and
a second asynchronous sample rate conversion circuit (127), coupled to the second sampling clock adjustment circuit (126), configured to sample a second audio data according to a second audio sampling clock (CLK _ a2), and transmit the sampled second audio data to a second playback circuit (128) for playback;
wherein the first control circuit (114) is further configured to:
controlling the first clock adjusting circuit (113) to generate a first slave clock (CLK _ P1S1) and a second master clock (CLK _ P2M) synchronized with the first master clock (CLK _ P1M) according to timing data of a first master clock (CLK _ P1M) generated by the source Bluetooth device (102); and
controlling the first bluetooth communication circuit (111) to transmit or receive packets in the first bluetooth piconet (310) according to the first slave clock (CLK _ P1S1), and controlling the first bluetooth communication circuit (111) to transmit or receive packets in the second bluetooth piconet (320) according to the second master clock (CLK _ P2M);
wherein the second control circuit (124) is further configured to:
controlling the second clock adjusting 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); and
controlling the second bluetooth communication circuit (121) to transmit or receive packets in the second bluetooth piconet (320) according to the second slave clock (CLK _ P2S 1).
2. The multi-member Bluetooth device (100) of claim 1, wherein the first control circuit (114) is further configured to control the first sample clock adjustment circuit (116) to generate the first audio sample clock (CLK _ A1) synchronized with the first master clock (CLK _ P1M), the first slave clock (CLK _ P1S1), or the second master clock (CLK _ P2M), and the second control circuit (124) is further configured to control the second sample clock adjustment circuit (126) to generate the second audio sample clock (CLK _ A2) synchronized with the second master clock (CLK _ P2M) or the second slave clock (CLK _ P2S1) such that the second audio sample clock (CLK _ A2) is indirectly synchronized with the first audio sample clock (CLK _ A1).
3. The multi-member bluetooth device (100) as claimed in claim 2, wherein the first control circuit (114) is further configured to transmit a first audio playback timing data corresponding to the first audio data to the secondary bluetooth circuit (120) via the first bluetooth communication circuit (111), and the second control circuit (124) is further configured to receive the first audio playback timing data via the second bluetooth communication circuit (121), and to 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, such that the corrected second audio sampling clock (CLK _ a2) is synchronized with the current first audio sampling clock (CLK _ a 1).
4. The multi-member bluetooth device (100) as claimed in claim 2, wherein the second control circuit (124) is further configured to transmit a second audio playback timing data corresponding to the second audio data to the master bluetooth circuit (110) via the second bluetooth communication circuit (121), and the first control circuit (114) is further configured to receive the second audio playback timing data via the first bluetooth communication circuit (111) and control the first sampling clock adjusting circuit (116) to correct the phase of the first audio sampling clock (CLK _ a1) according to the second audio playback timing data, such that the corrected first audio sampling clock (CLK _ a1) is synchronized with the current second audio sampling clock (CLK _ a 2).
5. The multi-member bluetooth device (100) according to claim 2, wherein the first control circuit (114) controls the first clock adjusting circuit (113) to generate the first slave clock (CLK _ P1S1) having the same frequency as the first master clock (CLK _ P1M) and being phase-aligned with the first master clock (CLK _ P1M) according to timing data of the first master clock (CLK _ P1M), and the first control circuit (114) further controls the first clock adjusting circuit (113) to generate the second master clock (CLK _ P2M) having the same frequency as the first master clock (CLK _ P1M) and being phase-aligned with the first master clock (CLK _ P1M) according to timing data of the first master clock (CLK _ P1M) or the first slave clock (CLK _ P1S 1).
6. The multi-member Bluetooth device (100) as claimed in claim 2, wherein the second control circuit (124) controls the second clock adjusting circuit (123) to generate the second slave clock (CLK _ P2S1) having the same frequency as the second master clock (CLK _ P2M) and being phase-aligned with the second master clock (CLK _ P2M) according to timing data of the second master clock (CLK _ P2M).
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| CN202011099368.XA Active CN112788737B (en) | 2019-11-05 | 2020-10-14 | Multi-member Bluetooth device capable of keeping synchronous audio playing of different Bluetooth circuits |
| CN202011099464.4A Active CN112788575B (en) | 2019-11-05 | 2020-10-14 | Main Bluetooth circuit and auxiliary Bluetooth circuit in multi-member Bluetooth device |
| CN202011097707.0A Active CN112788735B (en) | 2019-11-05 | 2020-10-14 | Multi-member Bluetooth device capable of reducing complexity of clock updating in Bluetooth circuit |
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| CN202011097707.0A Active CN112788735B (en) | 2019-11-05 | 2020-10-14 | Multi-member Bluetooth device capable of reducing complexity of clock updating in Bluetooth circuit |
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| CN112788737B (en) | 2024-01-09 |
| TW202119797A (en) | 2021-05-16 |
| TWI727898B (en) | 2021-05-11 |
| TWI727899B (en) | 2021-05-11 |
| TWI727897B (en) | 2021-05-11 |
| CN112788736A (en) | 2021-05-11 |
| CN112788735A (en) | 2021-05-11 |
| CN112788575B (en) | 2024-01-09 |
| CN112788736B (en) | 2024-01-12 |
| CN112788735B (en) | 2024-01-09 |
| TW202119838A (en) | 2021-05-16 |
| TWI733596B (en) | 2021-07-11 |
| TW202119795A (en) | 2021-05-16 |
| CN112788575A (en) | 2021-05-11 |
| TW202119796A (en) | 2021-05-16 |
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