Bluetooth audio equipment synchronous playing method and system, Bluetooth audio master equipment and Bluetooth audio slave equipment

A technology of synchronous playback and Bluetooth audio, which is applied in the direction of loudspeaker, connection management, earpiece/headphone accessories, etc. It can solve the problems of insufficient transmission accuracy and synchronization control, and achieve the effect of accurate playback delay

Active Publication Date: 2020-11-10
NANJING ZGMICRO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] With the continuous development of technology, people's requirements for audio quality are also increasing, and high-definition and high-resolution audio are constantly appearing. Taking CD-quality recorded audio as an example, its sampling rate is usually 16 bits 44.1kHz, that is, The duration of each sample point is 22.6us, and the sampling rate of Pono sound quality reaches 24-bit 192kHz, that is, the duration of each sample point is only 5.2us. However, the Bluetooth protocol stipulates that the duration of a Bluetooth time slot is 625us, so the time slot is the unit of transmission. The accuracy is not high enough to meet the requirements of more precise synchronous control

Method used

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  • Bluetooth audio equipment synchronous playing method and system, Bluetooth audio master equipment and Bluetooth audio slave equipment
  • Bluetooth audio equipment synchronous playing method and system, Bluetooth audio master equipment and Bluetooth audio slave equipment
  • Bluetooth audio equipment synchronous playing method and system, Bluetooth audio master equipment and Bluetooth audio slave equipment

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Embodiment 1

[0059] like figure 1 Shown in is the flowchart of this embodiment. For ease of description and understanding, figure 1 It not only includes the Bluetooth audio device synchronous playback method implemented on the Bluetooth audio master device side, but also includes the Bluetooth audio device synchronous playback method implemented on the Bluetooth audio slave device side.

[0060] S101: The Bluetooth audio master device receives audio data from a sound source device, and determines an audio data packet to be played synchronously.

[0061] The audio data is sent from the audio source device to the Bluetooth audio master device in a wireless manner based on a predetermined audio transmission protocol between the sound source device and the Bluetooth audio master device.

[0062] In a specific embodiment, the audio source device can use the coding format SBC (Sub-band coding, sub-band coding) stipulated in the A2DP (Advanced Audio Distribution Profile, Bluetooth audio transmi...

Embodiment 2

[0103] This embodiment is basically the same as Embodiment 1, the main difference is that in step S105, the Bluetooth audio slave device obtains the audio data packet to be played synchronously, and adopts a listening mode.

[0104] like image 3 Shown in is the timing diagram of this embodiment. (This picture is a concise and clear description of the data transmission and reception between the audio source device, the Bluetooth audio master device, and the Bluetooth audio slave device, so it is relatively figure 1 Some steps are omitted).

[0105] combine figure 1 It can be seen that:

[0106] In step S101, the Bluetooth audio master device receives the audio data sent from the audio source device, and then determines the audio data packets to be played synchronously;

[0107] In step S103 / S104, the Bluetooth audio master device determines the playing time of the current audio data packet, and then converts it into a time stamp including the value of the Bluetooth clock a...

Embodiment 3

[0114] This embodiment is generally the same as Embodiment 1, the main difference is that: the Bluetooth audio master device pre-stores audio data for synchronous playback, so in step S101, the Bluetooth audio master device no longer receives and buffers the audio data, but automatically The audio data is directly extracted from its storage unit.

[0115] In step 106, the audio data packet to be played synchronously sent by the bluetooth audio master device is based on a predetermined audio transmission protocol between the bluetooth audio master device and the bluetooth audio slave device, the above-mentioned audio data is encoded and packaged, and The time stamp is loaded into the audio data packet and sent to the Bluetooth audio slave device.

[0116] The embodiment of the present invention also provides a Bluetooth audio master device and a Bluetooth audio slave device:

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Abstract

The invention relates to the technical field of Bluetooth communication, in particular to a synchronous playing method and system for Bluetooth audio equipment, Bluetooth audio master equipment and Bluetooth audio slave equipment. The method comprises the steps of correspondingly determining the playing time of the audio data packet to be synchronously played at the Bluetooth audio main equipmentend; converting the playing time into a timestamp, wherein the timestamp comprises a Bluetooth clock value and a microsecond clock offset value; and sending the timestamp. At a Bluetooth audio slave device end, a timestamp is received, and an audio data packet to be synchronously played is received; and the Bluetooth audio slave device plays the audio data packet based on the timestamp, and playsthe audio data packet corresponding to the timestamp when both the value of the Bluetooth clock and the microsecond clock offset value arrive. According to the method, the playing time is determined based on the microsecond-level clock offset value, so that audio playing is started and carried out between each Bluetooth audio slave device or between the Bluetooth audio master device and the Bluetooth audio slave device based on the more accurate playing time, and the playing delay is at the microsecond level.

Description

technical field [0001] The invention relates to the technical field of bluetooth communication, in particular to a bluetooth audio device synchronous playback method, a bluetooth audio master, a bluetooth audio slave and a bluetooth audio synchronous play system. Background technique [0002] TWS is the abbreviation of True Wireless Stereo, that is, Bluetooth true stereo technology, which enables at least two independent Bluetooth audio devices (take Bluetooth headsets as an example) to completely abandon the connection line and directly connect through Bluetooth to play the stereo audio transmitted by the source device. flow. [0003] The core principle of TWS technology is to divide the two earphones into the master earphone (TWS Master) and the slave earphone (TWSSlave). The main earphone is an earphone that can receive the audio of the A2DP protocol transmitted by audio source devices such as smartphones and laptops, and transmit the audio to other TWS devices. The sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/80H04W28/04H04W76/10H04R1/10
CPCH04W4/80H04W28/04H04W76/10H04R1/1041H04R2201/10Y02D30/70
Inventor 袁赟高占东张亦农杨晓东
Owner NANJING ZGMICRO CO LTD
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