US-20260129701-A1 - Synchronized Transmission System and Method for Dual-Source Wireless Audio

US20260129701A1US 20260129701 A1US20260129701 A1US 20260129701A1US-20260129701-A1

Abstract

The present disclosure discloses a synchronized transmission system and method for dual-source wireless audio. The system comprises an audio device, a first audio source device, and a second audio source device. The audio device comprises a host processor and a plurality of controllers. The first audio source device establishes a first communication link with a first controller among the plurality of controllers to perform audio data transmission for a first audio stream; the second audio source device establishes a second communication link with a second controller among the plurality of controllers to perform audio data transmission for a second audio stream.

Inventors

Bin Xu
David Xiaodong Yang

Assignees

Zgmicro Wuxi Corporation

Dates

Publication Date: 20260507
Application Date: 20251030
Priority Date: 20241106

Claims (15)

1 . A synchronized transmission system, comprising: an audio device, comprising a host processor and a plurality of controllers; a first audio source device configured for establishing a first communication link with a first controller among the plurality of controllers to perform audio data transmission for a first audio stream with the audio device based on the first communication link; and a second audio source device configured for establishing a second communication link with a second controller among the plurality of controllers to perform audio data transmission for a second audio stream with the audio device based on the second communication link; wherein when the audio data transmission on the first communication link and the audio data transmission on the second communication link coexist, frequency division multiplexing is adopted between the first communication link and the second communication link, and a transmission time of either one of the first communication link and the second communication link does not overlap with a reception time of the other of the first communication link and the second communication link.
2 . The system according to claim 1 , wherein the first audio source device serves as a central device of the first communication link, the audio device serves as a peripheral device of the first communication link, and a first link clock of the first communication link is the same as or synchronized with a local clock of the first audio source device; the second audio source device serves as a peripheral device of the second communication link, the audio device serves as a central device of the second communication link, and a second link clock of the second communication link is the same as or synchronized with the first link clock.
3 . The system according to claim 2 , wherein when the second audio source device serves as the peripheral device of the second communication link, a local clock of the second audio source device is adjusted based on the second link clock of the second communication link, such that the adjusted local clock of the second audio source device is the same as or synchronized with the second link clock; the second audio source device is provided with an asynchronous Sampling Rate converter (ASRC), configured to synchronize a sampling rate of audio data input to the second audio source device with the adjusted local clock of the second audio source device.
4 . A synchronized transmission method, applied to an audio device comprising a host processor and a plurality of controllers, comprising: establishing a first communication link with a first audio source device using a first controller among the plurality of controllers, and performing audio data transmission for a first audio stream with the first audio source device based on the first communication link; and establishing a second communication link with a second audio source device using a second controller among the plurality of controllers, and performing audio data transmission for a second audio stream with the second audio source device based on the second communication link; wherein when the audio data transmission on the first communication link and the audio data transmission on the second communication link coexist, frequency division multiplexing is adopted between the first communication link and the second communication link, and a transmission time of either one of the first communication link and the second communication link does not overlap with a reception time of the other of the first communication link and the second communication link.
5 . The method according to claim 4 , wherein the first audio source device serves as a central device of the first communication link, the audio device serves as a peripheral device of the first communication link, and a first link clock of the first communication link is the same as or synchronized with a local clock of the first audio source device; the second audio source device serves as a peripheral device of the second communication link, the audio device serves as a central device of the second communication link, and a second link clock of the second communication link is the same as or synchronized with the first link clock.
6 . The method according to claim 5 , further comprising: acquiring the first link clock of the first communication link, and adjusting a local clock adopted by the first controller based on the first link clock, so that the adjusted local clock adopted by the first controller is the same as or synchronized with the first link clock when communicating with the first audio source device; and establishing or maintaining the second link clock of the second communication link according to the adjusted local clock adopted by the first controller, so that the second link clock is the same as or synchronized with the adjusted local clock adopted by the first controller when communicating with the second audio source device.
7 . The method according to claim 6 , wherein the establishing or maintaining the second link clock of the second communication link according to the adjusted local clock adopted by the first controller, so that the second link clock is the same as or synchronized with the adjusted local clock adopted by the first controller when communicating with the second audio source device, comprises: adjusting a local clock adopted by the second controller according to the adjusted local clock adopted by the first controller, so that the adjusted local clock adopted by the second controller is the same as or synchronized with the adjusted local clock adopted by the first controller, and establishing or maintaining the second link clock of the second communication link according to the adjusted local clock adopted by the second controller; or, the first controller and the second controller adopt the same local clock, and the second controller establishes or maintains the second link clock of the second communication link according to the adjusted local clock.
8 . The method according to claim 4 , wherein the first communication link is a Classic Bluetooth (CBT) link, and the second communication link uses a different link protocol than the first communication link.
9 . The method according to claim 8 , wherein the second communication link is a Bluetooth Low Energy (BLE) link.
10 . The method according to claim 9 , wherein the CBT link is a CBT Extended Synchronous Connection-Oriented (eSCO) link, and uses a 2EV3 packet type; the BLE link is a BLE Connected Isochronous Group (CIG) link, a sub-event interval of the BLE CIG link is equal to 1.25 ms, and an airtime occupied for transmitting one audio data packet is less than 858 μs.
11 . An audio device, comprising: a host processor; a first controller configured for establishing a first communication link with a first audio source device, so as to perform audio data transmission for a first audio stream with the first audio source device based on the first communication link; and a second controller configured for establishing a second communication link with a second audio source device, so as to perform audio data transmission for a second audio stream with the second audio source device based on the second communication link; wherein when the audio data transmission on the first communication link and the audio data transmission on the second communication link coexist, frequency division multiplexing is adopted between the first communication link and the second communication link, and a transmission time of either one of the first communication link and the second communication link does not overlap with a reception time of the other of the first communication link and the second communication link.
12 . The device according to claim 11 , wherein the audio device comprises a plurality of controllers comprising the first controller and the second controller, the host processor is respectively connected to the plurality of controllers; or, the plurality of controllers are connected in series, and are connected to the host processor through one controller among the plurality of controllers connected in series.
13 . The device according to claim 12 , wherein the plurality of controllers comprise one primary controller and at least one secondary controller; the host processor is respectively connected to the primary controller and the at least one secondary controller; or, the primary controller is connected in series with the at least one secondary controller, and the primary controller is connected to the host processor.
14 . The device according to claim 13 , wherein the controllers are controllers defined by a Bluetooth Core Specification; the primary controller comprises a host-controller interface (HCl) defined by the Bluetooth Core Specification, which is used for connecting to the host processor; the primary controller and the secondary controller further comprise physical interfaces configured to be cascaded with each other.
15 . The device according to claim 14 , wherein the primary controller and the at least one secondary controller are encapsulated in a single chip; an antenna of the primary controller and an antenna of the at least one secondary controller are distanced from each other by a specified distance; or, the primary controller and the at least one secondary controller share the same antenna.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS The present disclosure claims priority of Chinese Patent Application No. 2024115751098 filed in China on Nov. 6, 2024, the entire contents of which is incorporated herein by reference. FIELD OF THE INVENTION The present disclosure relates to the field of wireless audio transmission technologies, and specifically to a synchronized transmission system and method for dual-source wireless audio. BACKGROUND The rapid development of wireless connection technologies such as Classic Bluetooth (CBT), Bluetooth Low Energy (BLE), and Wireless Fidelity (WIFI) has made wireless audio and wireless calls an important part of people's lives. For example, CBT wireless audio terminal devices that use smartphones as audio source devices, such as CBT Audio headphones and CBT Audio speakers, are widely popular among people. BLE Audio, which offers lower latency, lower power consumption, and higher performance for wireless audio services, is also expected to receive increasing attention. However, conventional CBT Audio or BLE Audio terminal devices can only connect to one CBT or BLE audio source device to transmit and receive wireless audio, and do not support connecting to two or more CBT or BLE audio source devices to simultaneously transmit and receive wireless audio. For example, existing CBT or BLE Audio headphones cannot use one smartphone for an online meeting while simultaneously using another smartphone to make or receive a phone call. Similarly, they cannot use one smartphone for low-latency gaming while simultaneously using another smartphone for calls. In other words, conventional CBT or BLE wireless audio terminal devices are incapable of connecting to two or more CBT or BLE audio source devices to simultaneously transmit and receive wireless audio. In other words, they do not support Dual-Source Wireless Audio (DSWA) or Multi-Source Wireless Audio (MSWA). SUMMARY In view of this, the present disclosure provides a synchronized transmission system and method for dual-source wireless audio to solve the current problem that synchronized transmission of dual-source wireless audio cannot be achieved. In a first aspect, a synchronized transmission system for dual-source wireless audio is provided. The system comprises: an audio device, comprising a host processor and a plurality of controllers; a first audio source device configured for establishing a first communication link with a first controller among the plurality of controllers to perform audio data transmission for a first audio stream with the audio device based on the first communication link; and a second audio source device configured for establishing a second communication link with a second controller among the plurality of controllers to perform audio data transmission for a second audio stream with the audio device based on the second communication link; wherein when the audio data transmission on the first communication link and the audio data transmission on the second communication link coexist, frequency division multiplexing is adopted between the first communication link and the second communication link, and a transmission time of either one of the first communication link and the second communication link does not overlap with a reception time of the other of the first communication link and the second communication link. In a second aspect, a synchronized transmission method for dual-source wireless audio is provided. The method is applied to an audio device comprising a host processor and a plurality of controllers. The method comprises: establishing a first communication link with a first audio source device using a first controller among the plurality of controllers, and performing audio data transmission for a first audio stream with the first audio source device based on the first communication link; and establishing a second communication link with a second audio source device using a second controller among the plurality of controllers, and performing audio data transmission for a second audio stream with the second audio source device based on the second communication link. When the audio data transmission on the first communication link and the audio data transmission on the second communication link coexist, frequency division multiplexing is adopted between the first communication link and the second communication link, and a transmission time of either one of the first communication link and the second communication link does not overlap with a reception time of the other of the first communication link and the second communication link. In a third aspect, an audio device is provided. The audio device comprises: a host processor; a first controller configured for establishing a first communication link with a first audio source device, so as to perform audio data transmission for a first audio stream with the first audio source device based on the first communication link; and a second controller