CN112333610A - Audio playing method and device of Bluetooth TWS equipment - Google Patents
Audio playing method and device of Bluetooth TWS equipment Download PDFInfo
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- CN112333610A CN112333610A CN202011236825.5A CN202011236825A CN112333610A CN 112333610 A CN112333610 A CN 112333610A CN 202011236825 A CN202011236825 A CN 202011236825A CN 112333610 A CN112333610 A CN 112333610A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
Abstract
The main purpose of the embodiments of the present invention is to provide an audio playing method for a bluetooth TWS device, where the bluetooth TWS device includes a first device and a second device, and the method includes: the first equipment and the second equipment unpack the audio data packet into data frames with the same playing length; the first equipment acquires a Bluetooth clock t _ base required by data frame playing, and the second equipment acquires a Bluetooth clock t _ local required by data frame playing; the second equipment calculates the sample point deviation according to the difference between the Bluetooth clock t _ base and the Bluetooth clock t _ local; compensating the first device and/or the second device according to the sample point deviation. The embodiment of the invention also correspondingly provides audio playing of the Bluetooth TWS equipment. By adopting the technical scheme provided by the embodiment of the invention, the communication bandwidth consumption between the TWS equipment can be effectively reduced.
Description
Technical Field
The present application relates to the field of multimedia technologies, and in particular, to an audio playing method and apparatus for a bluetooth TWS device.
Background
With the advance of technology, wireless audio devices, such as wireless headsets, are becoming increasingly popular in the multimedia technology field. The most common of the Wireless earphones is the bluetooth earphone, and at present, two earphones which are completely independent are generally called as TWS (True Wireless Stereo) earphones, that is, the two earphones do not need to be connected by wire, each earphone is an independent Wireless earphone, technically, the mobile phone is connected with a main earphone, and then the main earphone is connected with a slave earphone by a bluetooth Wireless mode, so that the real bluetooth left and right sound channels are separated wirelessly for use. When the slave is not connected, the master returns to the mono tone quality.
When two earphones of a TWS device in the prior art start playing, because the bluetooth clocks of the master earphone device and the slave earphone device and the clocks of the audio module are not the same, playing information of a certain time point needs to be interacted at regular time, and whether a sample point deviation exists between the two devices is judged through the playing information. Because the total amount of communication bandwidth of bluetooth is certain, the prior art may cause the two bluetooth devices to interact too frequently, which affects normal bluetooth audio streaming. Therefore, a solution is needed to solve the problem of frequent information exchange between TWS bluetooth devices.
Disclosure of Invention
In view of this, an embodiment of the present invention provides an audio playing method for a bluetooth TWS device, which can effectively reduce communication bandwidth consumption between the TWS devices.
The embodiment of the invention is realized in such a way that an audio playing method of a Bluetooth TWS device comprises a first device and a second device, and the method comprises the following steps:
the first equipment and the second equipment unpack the audio data packet into data frames with the same playing length;
the first equipment acquires a Bluetooth clock t _ base required by data frame playing, and the second equipment acquires a Bluetooth clock t _ local required by data frame playing;
the second equipment calculates the sample point deviation according to the difference between the Bluetooth clock t _ base and the Bluetooth clock t _ local;
compensating the first device and/or the second device according to the sample point deviation.
Further, the first device sends the t _ base to the second device.
Further, the unpacking the audio data packets into data frames with the same playing length includes: and splitting the audio data packet into at least one audio frame according to the number of frames and the frame length in the audio data packet, wherein the length of each audio frame is consistent.
Further, the calculating the sample point deviation comprises:
calculating a Bluetooth clock t _ sample corresponding to the sample point of the single audio frame according to the Bluetooth clock t _ base and the sample point sample of the single audio frame;
calculating the Bluetooth clock deviation t _ diff of the first equipment and the second equipment according to the Bluetooth clock t _ base and the Bluetooth clock t _ local;
and calculating a sample point deviation sample _ diff according to the Bluetooth clock deviation t _ diff and the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame.
Further, a bluetooth clock corresponding to the sample point of the single audio frame is t _ base/sample;
the bluetooth clock bias t _ diff ═ abs (t _ local-t _ base);
the sample point offset sample _ diff _ t _ sample.
Further, the compensating the first device and/or the second device according to the sample point deviation comprises:
if t _ local is greater than t _ base, then the second device discards sample _ diff sample points;
if t _ local is less than t _ base, the second device increments sample _ diff sample points.
Further, the method further comprises,
the first device and/or the second device compensate for increased sample points or missing sample points by sample rate tweaking.
Further, the first device is a TWS master device, and the second device is a TWS slave device.
According to another aspect of the embodiments of the present invention, an embodiment of the present invention further provides an audio playing apparatus for a bluetooth TWS device, which can effectively reduce communication bandwidth consumption between the TWS devices.
The embodiment of the present invention is implemented as follows, an audio playing apparatus of a bluetooth TWS device, where the bluetooth TWS device includes a first device and a second device, and the audio playing apparatus includes:
unpacking device to unpack the audio data package into data frames with the same playing length;
clock acquisition means, configured to acquire a bluetooth clock t _ base required for playing a data frame by the first device, and acquire a bluetooth clock t _ local required for playing a data frame by the second device;
calculating means for calculating a sample point deviation according to a difference between the bluetooth clock t _ base and the bluetooth clock t _ local;
and the compensating device is used for compensating the first equipment and/or the second equipment according to the sample point deviation.
Further, the audio playing device further comprises: and the sending device is used for the first equipment to send the t _ base to the second equipment.
Further, the computing device further comprises:
the Bluetooth clock calculation device is used for calculating the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame according to the Bluetooth clock t _ base and the sample point sample of the single audio frame;
the Bluetooth clock deviation calculating device is used for calculating the Bluetooth clock deviation t _ diff of the first equipment and the second equipment according to the Bluetooth clock t _ base and the Bluetooth clock t _ local;
and the sample point deviation calculating device is used for calculating the sample point deviation sample _ diff according to the Bluetooth clock deviation t _ diff and the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame.
According to the technical scheme, the embodiment of the invention has the following effects: the method can reduce the communication bandwidth consumption between the TWS devices, reduce the retransmission times, improve the anti-interference capability and finally realize the smoothness of a data flow channel, thereby reducing the time delay caused by blockage.
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 shows a flowchart of an audio playing method of a bluetooth TWS device provided by the present application;
fig. 2 is a flowchart illustrating an audio playing method of the bluetooth TWS device according to another embodiment of the present disclosure.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related 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, an audio playing method of a bluetooth TWS device provided in an embodiment of the present invention is described, where the bluetooth TWS device includes a first device and a second device, and the method includes:
s101, the first device and the second device unpack the audio data packet into data frames with the same playing length;
s102, the first equipment acquires a Bluetooth clock t _ base required by data frame playing, and the second equipment acquires a Bluetooth clock t _ local required by data frame playing;
s103, calculating a sample point deviation by the second equipment according to the difference between the Bluetooth clock t _ base and the Bluetooth clock t _ local;
s104, compensating the first device and/or the second device according to the sample point deviation.
The above-described flow is described in detail with reference to fig. 2. Specifically, since the size of each audio packet is different, but the time for which each audio frame can be played is constant, we first perform an unpacking operation, and the first device and the second device unpack the audio packet into data frames with the same playing length, in order to use a bluetooth clock as a playing reference, for example, 3000us for one data frame, 2800us for a bluetooth clock, and split the audio packet into at least one audio frame according to the frame number and the frame length in the audio packet, where the length of each audio frame is the same. In the process of playing, one of the bluetooth devices, for example, the first device, in this embodiment, the TWS master device, sends the bluetooth clock t _ base consumed by playing a certain frame to another bluetooth device, that is, the second device, in this embodiment, the TWS slave device, and the second device monitors the bluetooth clock t _ local played by itself for each frame, and then compensates for the sample point deviation of the first device and/or the second device according to the difference between t _ local and t _ base. The compensation of the sample point deviation can be performed only on the first device, or can be performed only on the second device, and the first device and the second device are compensated at the same time according to requirements.
In another embodiment, as shown in fig. 2, a specific process for calculating the sample point deviation is as follows, a bluetooth clock t _ sample corresponding to a sample point of a single audio frame is calculated according to the bluetooth clock t _ base and the sample point sample of the single audio frame; calculating the Bluetooth clock deviation t _ diff of the first equipment and the second equipment according to the Bluetooth clock t _ base and the Bluetooth clock t _ local; and calculating a sample point deviation sample _ diff according to the Bluetooth clock deviation t _ diff and the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame. In this embodiment, the first device and the second device are a host and a secondary of the TWS, respectively, where the first device is the host and the second device is the secondary, specifically, if the sample point of each frame is sample, the bluetooth clock corresponding to a single sample point is t _ sample _ base/sample, the bluetooth clock offset of the primary and secondary is t _ diff _ abs (t _ local-t _ base), the corresponding sample point offset is sample _ diff _ t _ sample, if t _ local is greater than t _ base, the secondary needs to drop sample _ diff sample points, if t _ local is less than t _ base, the secondary needs to add sample _ diff sample points, and only one time of information interaction between the primary and secondary is needed, and subsequent adjustment is performed by itself, that is, the added sample point or the lack of sample point is compensated by single-sided fine adjustment. The audio stream is composed of a plurality of sample points, the sample points have different precisions, for example, 16 bits constitute one sample point, and 32 bits constitute one sample point.
In the foregoing process, after calculating the sample point deviation, the first device and/or the second device compensates for the added sample point or the missing sample point by fine-tuning the sampling rate. Compensating for the sample point deviation of the first device and/or the second device may be performed according to the following procedure, and if t _ local is greater than t _ base, the second device discards sample _ diff sample points; if t _ local is less than t _ base, the second device increments sample _ diff sample points.
According to another aspect of the embodiments of the present invention, an embodiment of the present invention further provides an audio playing apparatus of a bluetooth TWS device, where the bluetooth TWS device includes a first device and a second device, and the audio playing apparatus includes:
unpacking device to unpack the audio data package into data frames with the same playing length;
clock acquisition means, configured to acquire a bluetooth clock t _ base required for playing a data frame by the first device, and acquire a bluetooth clock t _ local required for playing a data frame by the second device;
calculating means for calculating a sample point deviation according to a difference between the bluetooth clock t _ base and the bluetooth clock t _ local;
and the compensating device is used for compensating the first equipment and/or the second equipment according to the sample point deviation.
Further, the audio playing device further comprises: and the sending device is used for the first equipment to send the t _ base to the second equipment.
Further, the computing device further comprises:
the Bluetooth clock calculation device is used for calculating the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame according to the Bluetooth clock t _ base and the sample point sample of the single audio frame;
the Bluetooth clock deviation calculating device is used for calculating the Bluetooth clock deviation t _ diff of the first equipment and the second equipment according to the Bluetooth clock t _ base and the Bluetooth clock t _ local;
and the sample point deviation calculating device is used for calculating the sample point deviation sample _ diff according to the Bluetooth clock deviation t _ diff and the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame.
Since the technical solution of the audio playing apparatus of the bluetooth TWS device corresponds to the audio playing method of the bluetooth TWS device, this embodiment is not described in detail.
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 (11)
1. An audio playing method of a bluetooth TWS device, the bluetooth TWS device comprising a first device and a second device, the method comprising:
the first equipment and the second equipment unpack the audio data packet into data frames with the same playing length;
the first equipment acquires a Bluetooth clock t _ base required by data frame playing, and the second equipment acquires a Bluetooth clock t _ local required by data frame playing;
the second equipment calculates the sample point deviation according to the difference between the Bluetooth clock t _ base and the Bluetooth clock t _ local;
compensating the first device and/or the second device according to the sample point deviation.
2. The audio playing method according to claim 1, wherein the method further comprises: and the first equipment sends the t _ base to the second equipment.
3. The audio playing method of claim 1, wherein the unpacking the audio data packets into data frames with the same playing length comprises: and splitting the audio data packet into at least one audio frame according to the number of frames and the frame length in the audio data packet, wherein the length of each audio frame is consistent.
4. The audio playing method according to claim 1, wherein the calculating the sample point deviation comprises:
calculating a Bluetooth clock t _ sample corresponding to the sample point of the single audio frame according to the Bluetooth clock t _ base and the sample point sample of the single audio frame;
calculating the Bluetooth clock deviation t _ diff of the first equipment and the second equipment according to the Bluetooth clock t _ base and the Bluetooth clock t _ local;
and calculating a sample point deviation sample _ diff according to the Bluetooth clock deviation t _ diff and the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame.
5. The audio playback method according to claim 4,
the Bluetooth clock corresponding to the sample point of the single audio frame is t _ base/sample;
the bluetooth clock bias t _ diff ═ abs (t _ local-t _ base);
the sample point offset sample _ diff _ t _ sample.
6. The audio playing method according to claim 4, wherein the compensating the first device and/or the second device according to the sample point deviation comprises:
if t _ local is greater than t _ base, then the second device discards sample _ diff sample points;
if t _ local is less than t _ base, the second device increments sample _ diff sample points.
7. The audio playing method according to claim 1, wherein the method further comprises,
the first device and/or the second device compensate for increased sample points or missing sample points by sample rate tweaking.
8. The audio playing method according to any one of claims 1 to 7, wherein the first device is a TWS master device, and the second device is a TWS slave device.
9. An audio playing apparatus of a bluetooth TWS device, the bluetooth TWS device comprising a first device and a second device, the audio playing apparatus comprising:
unpacking device to unpack the audio data package into data frames with the same playing length;
clock acquisition means, configured to acquire a bluetooth clock t _ base required for playing a data frame by the first device, and acquire a bluetooth clock t _ local required for playing a data frame by the second device;
calculating means for calculating a sample point deviation according to a difference between the bluetooth clock t _ base and the bluetooth clock t _ local;
and the compensating device is used for compensating the first equipment and/or the second equipment according to the sample point deviation.
10. The audio playback apparatus of a bluetooth TWS device according to claim 9, wherein the audio playback apparatus further comprises: and the sending device is used for the first equipment to send the t _ base to the second equipment.
11. The audio playback apparatus of a bluetooth TWS device according to claim 9, wherein the computing apparatus further comprises:
the Bluetooth clock calculation device is used for calculating the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame according to the Bluetooth clock t _ base and the sample point sample of the single audio frame;
the Bluetooth clock deviation calculating device is used for calculating the Bluetooth clock deviation t _ diff of the first equipment and the second equipment according to the Bluetooth clock t _ base and the Bluetooth clock t _ local;
and the sample point deviation calculating device is used for calculating the sample point deviation sample _ diff according to the Bluetooth clock deviation t _ diff and the Bluetooth clock t _ sample corresponding to the sample point of the single audio frame.
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