CN112953600B - Bluetooth system and communication method thereof - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive loop type
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
An object of an embodiment of the present invention is to provide a communication method of a bluetooth system, including: the master device sets public Bluetooth clock interrupt at a first time point and sends a clock value to the slave device; the slave device sets a first time point public Bluetooth clock interrupt according to a clock value; the master device and the slave device generate interruption at a first time point, the master device and the slave device simultaneously clear the DAC count, set the DAC playing speed gear as a central speed gear, start the DAC to play and set interruption of a next time interval T; the master device and the slave device generate interruption at the time point of the next time interval T, read the current DAC count value and set the interruption of the next time interval T; the slave equipment compares the difference value of the DAC count values and executes DAC playing speed gear adjustment according to the difference value; repeating the above steps at least once. The invention also provides a Bluetooth system, and the high-precision play alignment of the master device and the slave device can be realized by adopting the scheme.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a bluetooth system and a communication method thereof.
Background
The TWS (True Wireless Stereo) headset is a very popular headset form at present, and according to its working principle, it means that a mobile phone is connected to a main headset, and then the main headset is connected to an auxiliary headset in a Wireless manner, so as to realize the real Wireless separation use of left and right sound channels of bluetooth. When the slave loudspeaker box is not connected, the master loudspeaker box returns to the monophonic tone quality. Two schemes commonly used in TWS technology at present are that a master earphone forwards data to a slave earphone, and the slave earphone receives data by means of listening. An important technical index in the TWS headset is the synchronization of the master and slave headsets, i.e. the alignment accuracy of the master and slave headsets, and if the alignment accuracy is low, the dyssynchrony in the sense of human hearing may occur.
To solve this problem, many schemes for synchronization of TWS master and slave devices have been proposed in the industry. For example, in a patent application with chinese patent publication No. CN111817811A entitled "TWS headphone audio synchronous playing method and system, and TWS headphone", a scheme for implementing playing alignment of master and slave devices using a phase-locked loop is proposed, which needs to calculate the frequency deviation of the master and slave devices by means of two consecutive acquired values of the master device, and then perform adjustment. The whole implementation process of the scheme is very complex, and the alignment accuracy of the TWS master-slave equipment implemented by the scheme is relatively general.
Disclosure of Invention
In view of this, an embodiment of the present invention mainly aims to provide a communication method for a bluetooth system, which can implement high-precision play alignment of a master device and a slave device.
The embodiment of the invention is realized in such a way that a communication method of a Bluetooth system comprises a master device and at least one slave device, wherein the master device receives audio data of an audio source device and forwards the audio data to the slave device, and the method comprises the following steps:
step one, the master device sets public Bluetooth clock interrupt at a first time point and sends a clock value of the first time point to the slave device;
step two, the slave device sets public Bluetooth clock interrupt of a first time point according to the clock value of the first time point;
step three, the master device and the slave device generate interruption at the first time point, the master device and the slave device simultaneously clear the DAC count, the master device and the slave device set the DAC playing speed gear as a central speed gear and start the DAC playing and set interruption of the next time interval T;
step four, the master device and the slave device generate an interrupt at the time point of the next time interval T, and the master device and the slave device read the current DAC count value and set the interrupt of the next time interval T;
step five, the slave equipment compares the difference value of the DAC count values and executes DAC playing rate gear adjustment according to the difference value;
and step six, repeating the step four and the step five at least once.
Further, the slave device comparing the difference in DAC count values and performing DAC playout rate step adjustments based on the difference comprises:
and when the difference is less than or equal to N, maintaining the current DAC playing speed gear.
Further, the slave device comparing the difference of the DAC count values and performing DAC playout rate step adjustment based on the difference comprises:
when the difference value is K points larger than the DAC point of the master device, the slave device calculates the running time T1 of the high gear required to be heightened according to the difference value and the gear value of the speed regulating module; and after the slave equipment increases the DAC playing speed gear and runs for T1 time, adjusting the DAC playing speed gear back to the central speed gear.
Further, the slave device comparing the difference of the DAC count values and performing DAC playout rate step adjustment based on the difference comprises:
when the difference value is K points smaller than the DAC point of the master device, the slave device calculates the running time T2 of the low gear required to be adjusted down according to the difference value and the gear value of the speed adjusting module; and after the slave device reduces the DAC playing speed gear and runs for T2 time, the slave device is adjusted back to the central speed gear.
Further, the method further comprises: and the master equipment adjusts the DAC playing speed according to the buffered data volume, when the buffered data volume exceeds a preset threshold value, the DAC playing speed is increased, and when the buffered data volume is less than the preset threshold value, the DAC playing speed is decreased.
Further, the method further comprises: and the master device informs the slave device in real time after adjusting the DAC playing rate each time, and the slave device adjusts the DAC playing rate gear of the slave device on the basis of the reference rate by taking the DAC playing rate of the master device as the reference rate.
Further, the fifth step further comprises: and the master device sends the read DAC count value to the slave device, and the slave device stores the read DAC count value.
Furthermore, the DAC playing speed gears comprise L gears which are 0-L-1 gears respectively, and the central speed gear is (L-1)/2.
Further, the master device receiving audio data of an audio source device and forwarding to a slave device comprises:
the master device receives audio data of an audio source device and forwards the audio data to the slave device through a TWS mode;
the master device receives audio data of an audio source device and forwards the audio data to at least one of the slave devices via a bluetooth broadcast mode.
According to another aspect of the embodiments of the present invention, a main object of the embodiments of the present invention is to provide a bluetooth system, which can implement high-precision play alignment between a master device and a slave device.
The embodiment of the invention is realized in such a way that the Bluetooth system comprises a master device and a slave device, wherein the master device receives audio data of an audio source device and forwards the audio data to the slave device;
the master device is used for setting public Bluetooth clock interrupt at a first time point and sending a clock value of the first time point to the slave device;
the slave device is used for setting a first time point public Bluetooth clock interrupt according to the clock value of the first time point;
the master device and the slave device are also used for generating interruption at the first time point, simultaneously resetting the DAC count, setting a DAC playing speed gear as a central speed gear, starting DAC playing, and setting interruption of the next time interval T;
the master device and the slave device are also used for generating an interrupt at the time point of the next time interval T, reading the current DAC count value and setting the interrupt of the next time interval T;
and the slave equipment is also used for comparing the difference value of the DAC counting values and executing DAC playing speed gear adjustment according to the difference value.
According to the technical scheme, the embodiment of the invention has the following effects: the problem that when the TWS master and slave devices play, the played audio positions are accurate and consistent is solved, and a better audio synchronous playing effect is provided. The embodiment of the invention compares the audio DAC count values and then adjusts the playing speed of the DAC, so that the playing DAC count values of the master and slave equipment are kept consistent, and the TWS is played in a more accurate alignment manner.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a flowchart illustrating a communication method of a bluetooth system provided in the present application;
fig. 2 is a flowchart illustrating an embodiment of a communication method of a bluetooth system provided in the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments, and the order of steps in the following embodiments is merely illustrative and can be modified without conflict.
As shown in fig. 1, it is a flowchart of a communication method of a bluetooth system according to an embodiment of the present invention, where the bluetooth system includes a master device and at least one slave device, and the master device receives audio data of an audio source device and forwards the audio data to the slave device, the method includes:
step one, the master device sets public Bluetooth clock interrupt at a first time point and sends a clock value of the first time point to the slave device;
step two, the slave device sets public Bluetooth clock interrupt of a first time point according to the clock value of the first time point;
step three, the master device and the slave device generate interruption at the first time point, the master device and the slave device simultaneously clear the DAC count, the master device and the slave device set the DAC playing speed gear as a central speed gear and start the DAC playing and set interruption of the next time interval T;
step four, the master device and the slave device generate an interrupt at the time point of the next time interval T, and the master device and the slave device read the current DAC count value and set the interrupt of the next time interval T;
step five, the slave equipment compares the difference value of the DAC count values and executes DAC playing speed gear adjustment according to the difference value;
and step six, repeating the step four and the step five at least once.
The Bluetooth system in the embodiment of the invention comprises a master device and at least one slave device, wherein the master device receives audio data of an audio source device and forwards the audio data to the slave device, the audio source device can be connected with the master device through wireless communication, for example, through a Bluetooth or wifi wireless communication mode, the audio source device can be a mobile phone or other intelligent devices, or the master device can read an audio source through a wired or self audio playing device, the audio source device is a card device, a Linein input device, an FM (frequency modulation) device, a usb (user) audio device and the like, and the master device and the slave device can be earphones, a sound box or other audio playing devices.
The method for forwarding the audio data received by the audio source device to the slave device by the master device includes the following two methods:
the method comprises the steps that firstly, the master device receives audio data of an audio source device and forwards the audio data to the slave device through a TWS mode; at the moment, the Bluetooth system comprises a TWS master device and a TWS slave device, wherein the TWS mode is formed by the master device and the TWS slave device;
and secondly, the master device receives the audio data of the audio source device and forwards the audio data to at least one slave device through a Bluetooth broadcast mode, the Bluetooth system comprises the master device and the at least one slave device, the master device sends the audio data to the at least one slave device through Bluetooth broadcast, and a Bluetooth broadcast link is established between the master device and the slave device. The broadcast mode may be implemented by an Asynchronous Connectionless (Asynchronous Connectionless) link, the master device forwards the audio data to the at least one slave device via a bluetooth ACL link, and the data forwarding between the master device and the slave device is performed by establishing a bluetooth ACL link
The above flow is described in detail with a specific implementation, and as shown in fig. 2, a communication flow diagram of the bluetooth device according to an embodiment of the present invention is described in detail with reference to fig. 2 as a TWS mode.
The TWS master device and the TWS slave device are connected through Bluetooth, the TWS master device is connected with an audio source device through Bluetooth, for example, a mobile phone and other Bluetooth audio transmitters, and the TWS master device receives audio data of an audio source and forwards the audio data to the TWS slave device through Bluetooth. When the audio source starts playing, the audio source sends audio data to the master device, and the master device forwards the audio data to the slave device at the same time. The TWS device may be a TWS headset, a TWS speaker, or the like.
(1) The audio source starts playing, the master device receives audio data for caching and forwards the audio data to the slave device, and the slave device receives the audio data for caching;
(2) the method comprises the steps that a certain audio data volume is cached by a master device to a time point A, at the moment, the master device sets public Bluetooth clock interrupt at a first time point and sends a clock value of the first time point to a slave device; the common Bluetooth clock at the first time point B is interrupted, meanwhile, the common Bluetooth clock value at the point B is sent to the slave equipment, audio data decoding is carried out, the played DAC data are prepared, but the DAC playing is not started;
(3) the slave device sets a first time point public Bluetooth clock interrupt according to the clock value of the first time point; specifically, after the slave device receives the common bluetooth clock value of the master device at a1, the slave device also sets a common bluetooth clock interrupt at a first time point, namely B-point time, and decodes audio data, so as to prepare DAC data for playing, but does not start DAC playing;
(4) the master device and the slave device generate an interrupt at a first time point, namely a point B of a public Bluetooth clock, the master device and the slave device simultaneously clear a count value of a DAC (digital-to-analog converter), the master device and the slave device set a DAC speed regulation gear as a central speed gear, then the DAC is started to start playing, the master device and the slave device simultaneously set a public Bluetooth clock interrupt of a next time interval T, and the time point generated by the interrupt is a point C; the DAC speed regulation gears, namely the playing speed gears comprise L gears which are 0-L-1 gears respectively, the central speed gear is (L-1)/2, the playing speed of the gear close to the front, namely the lower gear, is slower, and the playing speed of the gear close to the back, namely the higher gear, is faster.
(5) The master device and the slave device both generate an interrupt at the time point of the next time interval T, namely the C point of the common Bluetooth clock, the master device and the slave device both read the DAC count value at the time point, and both set the interrupt of the common Bluetooth clock of the next time interval T, and the interrupt is generated at the D point;
(6) and the slave equipment compares the difference value of the DAC count values and executes DAC playing rate gear adjustment according to the difference value. Before the slave device calculates the difference value, the master device sends the read DAC count value and the common Bluetooth clock value of the point C to the slave device, and the slave device stores the DAC count value read by the point C and the common Bluetooth clock value of the point C. The slave device receives the DAC count value of the point C and the public Bluetooth clock value of the point C sent by the master device at the point C1, the slave device compares the DAC count value of the point C of the master device with the DAC count value of the point C, and the following three strategies are executed according to the difference value of the DAC count values:
(a) when the difference is smaller than or equal to N, maintaining the current DAC playing speed gear, keeping the difference between the DAC point numbers of the master device and the slave device within N, wherein N can be within 2 or 3 points, the time deviation between the master device and the slave device is small, no adjustment is needed, and the specific value of N can be set according to development requirements;
(b) when the difference value is K points larger than the DAC point of the master device, the slave device calculates the running time T1 of the high gear required to be heightened according to the difference value and the gear value of the speed regulating module; and after the slave equipment increases the DAC playing speed gear and runs for T1 time, the slave equipment is adjusted back to the central speed gear. The DAC point of the master device is K points larger than that of the slave device, which indicates that the slave device is slow to play, the slave device selects a gear which is faster than a central speed gear according to the K value and a gear value of a speed regulating module, calculates the number of points which need to play more K values at the running time T1 of the faster gear, then the slave device is adjusted to the faster gear to run for T1 time, and is adjusted back to the central speed gear after running for T1 time;
(c) when the difference value is K points smaller than the DAC point of the master device, the slave device calculates the running time T2 of the low gear required to be adjusted to be low according to the difference value and the gear value of the speed regulating module; and after the slave device reduces the DAC playing speed gear and runs for T2 time, the slave device is adjusted back to the central speed gear. The DAC point of the master device is smaller than that of the slave device by K points, which indicates that the slave device plays faster, the slave device selects a gear slower than a central speed gear according to the K value and a gear value of a speed regulating module, calculates the number of points which need to play less K values in the operation time T2 of the slower gear, then the slave device is adjusted to the slower gear to operate for T2 time, and is adjusted to the central speed gear after operating for T2 time;
(7) and (4) repeating the processes from (4) to (6) at least once subsequently to perform continuous rate adjustment, and by means of the alignment, the playing time difference of the master device and the slave device can be kept within 1-2 sampling points. For example: for 48K audio playing data, the playing time of one sampling point is about 20us, so that the playing time difference between the master device and the slave device is controlled within 40us, and an accurate audio synchronous playing effect is achieved.
The above embodiments are described in terms of TWS master and slave devices, and those skilled in the art will understand that the above embodiments are also applicable to play alignment between the master and slave devices connected via a bluetooth broadcast mode.
The invention also provides another embodiment, on the basis of the above embodiment, the master device adjusts the DAC playing rate according to the buffered data amount, when the buffered data amount exceeds a predetermined threshold, the DAC playing rate is adjusted faster, and when the buffered data amount is less than the predetermined threshold, the DAC playing rate is adjusted slower; and the master device informs the slave device in real time after adjusting the DAC playing rate each time, and the slave device adjusts the DAC playing rate gear of the slave device on the basis of the reference rate by taking the DAC playing rate of the master device as the reference rate. And under the condition that the master device adjusts the DAC playing speed, the slave device is informed in real time every time when the buffer data volume is small, and the slave device performs deviation adjustment on the master device and the slave device on the basis of the reference speed by taking the DAC speed of the master device as the reference speed. The main device calculates the duration of the playing of the buffered data according to the buffered data, and uses the time as a threshold, the normal range is Tn-Tm, when the duration is smaller than Tn, the data volume is insufficient and slow down, when the duration is larger than Tm, the data volume is large and fast, for example, the Tn time is set to 80ms and Tm is set to 160ms, and those skilled in the art understand that the setting of the predetermined threshold can be adjusted according to the product design.
According to another aspect of the embodiments of the present invention, there is also provided a bluetooth system, including a master device and at least one slave device, wherein the master device receives audio data of an audio source device and forwards the audio data to the slave device;
the master device is used for setting public Bluetooth clock interrupt at a first time point and sending a clock value of the first time point to the slave device;
the slave device is used for setting a first time point public Bluetooth clock interrupt according to the clock value of the first time point;
the master device and the slave device are also used for generating interruption at the first time point, simultaneously resetting the DAC count, setting a DAC playing speed gear as a central speed gear, starting DAC playing, and setting interruption of the next time interval T;
the master device and the slave device are also used for generating an interrupt at the time point of the next time interval T, reading the current DAC count value and setting the interrupt of the next time interval T;
and the slave equipment is also used for comparing the difference value of the DAC count values and executing DAC playing rate gear adjustment according to the difference value.
The technical solution of the bluetooth system of the above embodiment is substantially consistent with the communication method of the bluetooth system of the above embodiment, and is not described herein again.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A communication method of a bluetooth system, the bluetooth system comprising a master device and at least one slave device, the master device receiving audio data of an audio source device and forwarding to the slave device, the method comprising:
step one, the master device sets public Bluetooth clock interrupt at a first time point and sends a clock value of the first time point to the slave device;
step two, the slave device sets public Bluetooth clock interrupt of a first time point according to the clock value of the first time point;
step three, the master device and the slave device generate interruption at the first time point, the master device and the slave device simultaneously clear the DAC count, the master device and the slave device set the DAC playing speed gear as a central speed gear and start the DAC playing and set interruption of the next time interval T;
step four, the master device and the slave device generate an interrupt at the time point of the next time interval T, and the master device and the slave device read the current DAC count value and set the interrupt of the next time interval T;
step five, the slave equipment compares the difference value of the DAC count values and executes DAC playing speed gear adjustment according to the difference value;
step six, repeating the step four and the step five at least once;
the method further comprises: the master equipment adjusts the DAC playing speed according to the buffered data volume, when the buffered data volume exceeds a preset threshold value, the DAC playing speed is increased, and when the buffered data volume is smaller than the preset threshold value, the DAC playing speed is decreased; and the master device informs the slave device in real time after adjusting the DAC playing rate each time, and the slave device adjusts the DAC playing rate gear of the slave device on the basis of the reference rate by taking the DAC playing rate of the master device as the reference rate.
2. The communication method of claim 1, wherein the slave device comparing the difference in DAC count values and performing a DAC playout rate step adjustment based on the difference comprises:
and when the difference is less than or equal to N, maintaining the current DAC playing speed gear.
3. The communication method of claim 1, wherein the slave device comparing the difference in DAC count values and performing a DAC playout rate step adjustment based on the difference comprises:
when the difference value is K points larger than the DAC point of the master device, the slave device calculates the running time T1 of the high gear required to be adjusted to be high according to the difference value and the gear value of the speed regulation module; and after the slave equipment increases the DAC playing speed gear and runs for T1 time, adjusting the DAC playing speed gear back to the central speed gear.
4. The communication method of claim 1, wherein the slave device comparing the difference in DAC count values and performing a DAC playout rate step adjustment based on the difference comprises:
when the difference value is K points smaller than the DAC point of the master device, the slave device calculates the running time T2 of the low gear required to be adjusted to be low according to the difference value and the gear value of the speed regulating module; and after the slave device reduces the DAC playing speed gear and runs for T2 time, the slave device adjusts the DAC playing speed gear back to the central speed gear.
5. The communication method according to claim 1, wherein the step five further comprises: and the master device sends the read DAC count value to the slave device, and the slave device stores the read DAC count value.
6. The communication method according to claim 1, wherein the DAC playing rate steps include L steps, which are 0 to L-1 steps, respectively, and the central rate step is (L-1)/2.
7. The communication method of claim 1, wherein the master device receiving audio data of an audio source device and forwarding to a slave device comprises:
the master device receives audio data of an audio source device and forwards the audio data to the slave device through a TWS mode;
the master device receives audio data of an audio source device and forwards the audio data to at least one of the slave devices via a bluetooth broadcast mode.
8. A Bluetooth system comprising a master device and at least one slave device, the master device receiving audio data of an audio source device and forwarding to the slave device,
the master device is used for setting public Bluetooth clock interrupt at a first time point and sending a clock value of the first time point to the slave device;
the slave device is used for setting a first time point public Bluetooth clock interrupt according to the clock value of the first time point;
the master device and the slave device are also used for generating interruption at the first time point, simultaneously resetting the DAC count, setting a DAC playing speed gear as a central speed gear, starting DAC playing, and setting interruption of the next time interval T;
the master device and the slave device are also used for generating an interrupt at the time point of the next time interval T, reading the current DAC count value and setting the interrupt of the next time interval T;
the slave device is also used for comparing the difference value of the DAC counting values and executing DAC playing speed gear adjustment according to the difference value;
the master equipment adjusts the DAC playing speed according to the buffered data volume, when the buffered data volume exceeds a preset threshold value, the DAC playing speed is increased, and when the buffered data volume is smaller than the preset threshold value, the DAC playing speed is decreased; and the master device informs the slave device in real time after adjusting the DAC playing rate each time, and the slave device adjusts the DAC playing rate gear of the slave device on the basis of the reference rate by taking the DAC playing rate of the master device as the reference rate.
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| CN112953600A (en) | 2021-06-11 |
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