CN114648863A - Bluetooth audio broadcasting system and multi-member Bluetooth device - Google Patents

Bluetooth audio broadcasting system and multi-member Bluetooth device Download PDF

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Publication number
CN114648863A
CN114648863A CN202111361185.5A CN202111361185A CN114648863A CN 114648863 A CN114648863 A CN 114648863A CN 202111361185 A CN202111361185 A CN 202111361185A CN 114648863 A CN114648863 A CN 114648863A
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China
Prior art keywords
bluetooth
audio
circuit
member device
volume
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CN202111361185.5A
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Chinese (zh)
Inventor
刘又瑄
林勇杰
顾青
魏碧
陈奕铮
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Realtek Semiconductor Corp
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Realtek Semiconductor Corp
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
    • G10L2015/223—Execution procedure of a spoken command
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups

Abstract

The present disclosure relates to a bluetooth audio broadcasting system and a multi-member bluetooth device. This specification provides a bluetooth audio broadcasting system, comprising: an audio broadcasting device, which can broadcast the low-power Bluetooth audio package; the first Bluetooth member device can analyze the low-power Bluetooth audio packet to acquire preset audio data and control the first audio playing circuit to play the preset audio data; and a second Bluetooth member device capable of analyzing the low power consumption Bluetooth audio packet to obtain the predetermined audio data and controlling the second audio playing circuit to play the predetermined audio data. The audio broadcasting device also transmits a volume adjustment indication to the first Bluetooth member device and the second Bluetooth member device after the first Bluetooth member device sends a volume adjustment request. The first Bluetooth member device can adjust a volume of the first audio playing circuit according to the volume adjusting instruction. The second Bluetooth member device can adjust a volume of the second audio playing circuit according to the volume adjustment indication.

Description

Bluetooth audio broadcasting system and multi-member Bluetooth device
Technical Field
The present invention relates to Bluetooth technology, and more particularly, to a Bluetooth audio broadcasting system and related multi-member Bluetooth device for supporting Bluetooth Low Energy (BLE) audio broadcasting operation and synchronously adjusting volume.
Background
The Bluetooth technology is divided into two major categories, one is the Bluetooth Legacy (Legacy Bluetooth/Legacy Bluetooth) technology, and the other is the Low power Bluetooth (BLE) technology. The BLE technology and the bluetooth legacy technology are not compatible with each other (or cannot be completely compatible), but both technologies can coexist (coexist) on the same bluetooth device or the same bluetooth chip. In other words, a single bluetooth device or a single bluetooth chip may be designed to support both BLE technology and bluetooth legacy technology, or may be designed to support only one of the bluetooth communication standards.
A Bluetooth Low Energy (LE) Audio technology (hereinafter referred to as BLE Audio technology) newly introduced based on the Bluetooth core specification version 5.2 is a major update of Audio transmission technical specifications for over 20 years of Bluetooth technology development. The main advantage of BLE audio technology is that higher quality audio can be transmitted while at the same time power consumption is substantially reduced. In addition, BLE audio technology also utilizes a new mechanism called Broadcast Isochronous Streaming (BIS) for audio broadcasting. The use of multi-member bluetooth devices to receive and play audio broadcast content using BLE audio technology is one of the main development directions of future bluetooth-related applications. The aforementioned multi-member bluetooth device refers to a bluetooth device composed of a plurality of bluetooth circuits used in cooperation with each other, such as paired bluetooth headsets, grouped bluetooth speakers, and so on.
As is well known, the BLE audio technology does not specify how to flexibly adjust the volume playing size of the audio receiving end when performing audio broadcasting by using BIS. Of course, the BLE audio technology further does not specify how to synchronously adjust the volume playing sizes of different bluetooth member devices in the multi-member bluetooth device when performing audio broadcasting by using BIS. It is anticipated that certain problems may be derived when audio broadcasting is implemented using BLE audio technology. For example, an audio broadcast with an unexpected volume may cause some users to feel uncomfortable or unpleasant, and even some users may be surprised by receiving an audio broadcast with a sudden and excessive volume. Furthermore, the sensitivity and tolerance of different users to volume levels are different, so that a single volume level setting obviously cannot satisfy the requirements of different users at the same time.
Therefore, when a multi-member bluetooth device is used to receive and play an audio broadcast using BLE audio technology, if the volume playing sizes of different bluetooth member devices in the multi-member bluetooth device cannot be flexibly and synchronously adjusted, the development prospect of the BLE audio technology in the audio broadcast application will be seriously hindered.
Disclosure of Invention
In view of the above, how to flexibly and synchronously adjust the volume playing sizes of different bluetooth member devices in a multi-member bluetooth device when the multi-member bluetooth device is used to receive and play an audio broadcast using BLE audio technology is a problem to be solved.
This specification provides an embodiment of a bluetooth audio broadcasting system, which comprises: an audio broadcasting device configured to broadcast one or more Bluetooth low energy audio packets via a broadcast isochronous streaming logical transport channel; a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; wherein the audio broadcasting device is further configured to send a predetermined volume indication to the first bluetooth member device and the second bluetooth member device prior to broadcasting the one or more bluetooth low energy audio packets; the first Bluetooth communication circuit is further configured to receive the predetermined volume indication, and the first control circuit is further configured to control the first audio processing circuit to preset a volume of the first audio playing circuit according to the predetermined volume indication; the second bluetooth communication circuit is further configured to receive the predetermined volume indication, and the second control circuit is further configured to control the second audio processing circuit to preset a volume of the second audio playing circuit according to the predetermined volume indication.
The present specification further provides an embodiment of a multi-member bluetooth device, comprising: a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive one or more bluetooth low energy (low) audio packets broadcast by an audio broadcasting device via a broadcast isochronous streaming logical transmission channel; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets broadcast by the audio broadcasting device via the broadcast isochronous streaming logic transmission channel; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; wherein the first control circuit is further configured to control the first bluetooth member device to act as a bluetooth master in a bluetooth piconet, and the second control circuit is further configured to control the second bluetooth member device to act as a bluetooth slave in the bluetooth piconet; wherein the audio broadcasting device further sends a predetermined volume indication to the first Bluetooth member device and the second Bluetooth member device before broadcasting the one or more Bluetooth low energy audio packets; the first Bluetooth communication circuit is further configured to receive the predetermined volume indication, and the first control circuit is further configured to control the first audio processing circuit to preset a volume of the first audio playing circuit according to the predetermined volume indication; the second bluetooth communication circuit is further configured to receive the predetermined volume indication, and the second control circuit is further configured to control the second audio processing circuit to preset a volume of the second audio playing circuit according to the predetermined volume indication.
One advantage of the foregoing embodiments is that the audio broadcasting device can send a predetermined volume indication to the first bluetooth member device and the second bluetooth member device before broadcasting the bluetooth low energy audio packet, so that the first bluetooth member device and the second bluetooth member device can set the volume of the related audio broadcasting circuit synchronously in advance.
The present specification further provides an embodiment of a bluetooth audio broadcasting system, which includes: an audio broadcasting device configured to broadcast one or more Bluetooth low energy audio packets via a broadcast isochronous streaming logical transport channel; a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; wherein after the first and second bluetooth member devices receive the one or more bluetooth low energy audio packets, the audio broadcasting device further transmits a volume adjustment indication to the first and second bluetooth member devices upon receiving a volume adjustment signal; the first Bluetooth communication circuit is further configured to receive the volume adjustment indication, and the first control circuit is further configured to control the first audio processing circuit to adjust a volume of the first audio playing circuit according to the volume adjustment indication; the second bluetooth communication circuit is further configured to receive the volume adjustment indication, and the second control circuit is further configured to control the second audio processing circuit to adjust a volume of the second audio playing circuit according to the volume adjustment indication.
The present specification further provides an embodiment of a multi-member bluetooth device, comprising: a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive one or more bluetooth low energy (low) audio packets broadcast by an audio broadcasting device via a broadcast isochronous streaming logical transmission channel; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets broadcast by the audio broadcasting device via the broadcast isochronous streaming logic transmission channel; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; wherein the first control circuit is further configured to control the first bluetooth member device to act as a bluetooth master in a bluetooth piconet, and the second control circuit is further configured to control the second bluetooth member device to act as a bluetooth slave in the bluetooth piconet; wherein after the first and second bluetooth member devices receive the one or more bluetooth low energy audio packets, the audio broadcasting device further transmits a volume adjustment indication to the first and second bluetooth member devices upon receiving a volume adjustment signal; the first Bluetooth communication circuit is further configured to receive the volume adjustment indication, and the first control circuit is further configured to control the first audio processing circuit to adjust a volume of the first audio playing circuit according to the volume adjustment indication; the second bluetooth communication circuit is further configured to receive the volume adjustment indication, and the second control circuit is further configured to control the second audio processing circuit to adjust a volume of the second audio playing circuit according to the volume adjustment indication.
One of the advantages of the above embodiments is that after the first bluetooth member device and the second bluetooth member device receive the bluetooth low energy audio packets broadcasted by the audio broadcasting device, the first bluetooth member device and the second bluetooth member device can synchronously adjust the volume of the related audio playing circuit according to the volume adjustment indication transmitted by the audio broadcasting device.
The present specification further provides an embodiment of a bluetooth audio broadcasting system, which includes: an audio broadcasting device configured to broadcast one or more bluetooth low energy audio packets via a broadcast isochronous streaming logical transmission channel; a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; wherein the audio broadcasting device further transmits a volume adjustment indication to the first Bluetooth member device and the second Bluetooth member device after the first Bluetooth member device sends a volume adjustment request; the first Bluetooth communication circuit is further configured to receive the volume adjustment indication, and the first control circuit is further configured to control the first audio processing circuit to adjust a volume of the first audio playing circuit according to the volume adjustment indication; the second bluetooth communication circuit is further configured to receive the volume adjustment indication, and the second control circuit is further configured to control the second audio processing circuit to adjust a volume of the second audio playing circuit according to the volume adjustment indication.
The present specification further provides an embodiment of a multi-member bluetooth device, comprising: a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive one or more bluetooth low energy (low) audio packets broadcast by an audio broadcasting device via a broadcast isochronous streaming logical transmission channel; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets broadcast by the audio broadcasting device via the broadcast isochronous streaming logic transmission channel; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; wherein the audio broadcasting device further transmits a volume adjustment indication to the first Bluetooth member device and the second Bluetooth member device after the first Bluetooth member device sends a volume adjustment request; the first Bluetooth communication circuit is further configured to receive the volume adjustment indication, and the first control circuit is further configured to control the first audio processing circuit to adjust a volume of the first audio playing circuit according to the volume adjustment indication; the second bluetooth communication circuit is further configured to receive the volume adjustment indication, and the second control circuit is further configured to control the second audio processing circuit to adjust a volume of the second audio playing circuit according to the volume adjustment indication.
One advantage of the foregoing embodiment is that the audio broadcasting device can transmit a volume adjustment indication to the first bluetooth member device and the second bluetooth member device after the first bluetooth member device sends a volume adjustment request, so that the first bluetooth member device and the second bluetooth member device can synchronously adjust the volume of the associated audio playing circuit according to the volume adjustment indication.
The present specification further provides an embodiment of a bluetooth audio broadcasting system, which includes: an audio broadcasting device configured to broadcast one or more Bluetooth low energy audio packets via a broadcast isochronous streaming logical transport channel; a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; the first audio processing circuit is further configured to adjust a volume of the first audio playing circuit according to a volume adjustment instruction transmitted by another device other than the audio broadcasting device after the first bluetooth communication circuit receives the one or more low-power-consumption bluetooth audio packets; the second audio processing circuit is further configured to adjust a volume of the second audio playback circuit according to the volume adjustment indication after the second bluetooth communication circuit receives the one or more bluetooth low energy audio packets.
The present specification further provides an embodiment of a multi-member bluetooth device, comprising: a first bluetooth member device, comprising: a first bluetooth communication circuit configured to receive one or more bluetooth low energy (low) audio packets broadcast by an audio broadcasting device via a broadcast isochronous streaming logical transmission channel; a first audio processing circuit; and a first control circuit, coupled to the first bluetooth communication circuit and the first audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the first bluetooth communication circuit to obtain a predetermined audio data, and instruct the first audio processing circuit to control a first audio playback circuit to play the predetermined audio data; and a second bluetooth member device, comprising: a second bluetooth communication circuit configured to receive the one or more bluetooth low energy audio packets broadcast by the audio broadcasting device via the broadcast isochronous streaming logical transmission channel; a second audio processing circuit; and a second control circuit, coupled to the second bluetooth communication circuit and the second audio processing circuit, configured to parse the one or more bluetooth low energy packets received by the second bluetooth communication circuit to obtain the predetermined audio data, and instruct the second audio processing circuit to control a second audio playback circuit to play the predetermined audio data; the first control circuit is further configured to control the first audio processing circuit to adjust a volume of the first audio playing circuit according to a volume adjustment instruction transmitted by another device other than the audio broadcasting device after the first bluetooth communication circuit receives the one or more low-power-consumption bluetooth audio packets; the second control circuit is further configured to control the second audio processing circuit to adjust a volume of the second audio playback circuit according to the volume adjustment indication after the second bluetooth communication circuit receives the one or more bluetooth low energy audio packets.
One advantage of the foregoing embodiment is that after receiving the bluetooth low energy audio packets broadcast by the audio broadcasting device, the first bluetooth member device and the second bluetooth member device can synchronously adjust the volume of the associated audio playing circuit according to a volume adjustment indication transmitted by the other device.
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 bluetooth audio broadcasting system according to a first embodiment of the present invention.
Fig. 2 is a simplified flowchart of a method for performing audio broadcasting by using BLE audio technology according to a first embodiment of the present invention.
Fig. 3 is a simplified functional block diagram of a bluetooth audio broadcasting system according to a second embodiment of the present invention.
Fig. 4 to 5 are simplified flowcharts of a method for performing audio broadcasting by using BLE audio technology according to a second embodiment of the present invention.
Fig. 6 is a simplified functional block diagram of a bluetooth audio broadcasting system according to a third embodiment of the present invention.
Fig. 7 is a simplified functional block diagram of a bluetooth audio broadcasting system according to a fourth embodiment of the present invention.
Fig. 8 is a simplified functional block diagram of a bluetooth audio broadcasting system according to a fifth embodiment of the present invention.
Fig. 9 is a simplified functional block diagram of a bluetooth audio broadcasting system according to a sixth embodiment of the present invention.
Fig. 10 is a simplified functional block diagram of a bluetooth audio broadcasting system according to a seventh embodiment of the present invention.
Fig. 11 is a simplified flowchart of a method for performing audio broadcasting by using BLE audio technology according to a third embodiment of the present invention.
Fig. 12 is a simplified functional block diagram of a bluetooth audio broadcasting system according to an eighth embodiment of the present invention.
Fig. 13 is a simplified flowchart of a method for audio broadcasting using BLE audio technology according to a fourth embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numbers indicate the same or similar elements or process flows.
Fig. 1 is a simplified functional block diagram of a bluetooth audio broadcasting system 100 according to a first embodiment of the present invention. The Bluetooth audio broadcasting system 100 includes a plurality of Bluetooth member devices (Bluetooth member devices) capable of receiving audio broadcasting, and an audio broadcasting device 150 for broadcasting audio data. The Audio broadcasting apparatus 150 is configured to broadcast Audio data of various contents, such as flight information in an airport, a shift reminder notification in a train station or a high-speed rail station, a drama sound in a movie theater, voice information in a sports hall, a guide voice in a museum, an introduction voice in an exhibition hall, a voice translation in a lecture hall, music or voice data selected by a user, multi-channel Audio provided by a television, a content of a teacher in a classroom, or other types of Audio contents, by using a low power consumption Bluetooth Audio (BLE Audio) technology (hereinafter referred to as BLE Audio technology) specified in the Bluetooth core specification version 5.2 or later.
The plurality of bluetooth member devices in the bluetooth audio broadcasting system 100 support the BLE technology specified in the bluetooth core specification version 5.2 or later, and can receive and play audio data broadcasted by the audio broadcasting device 150. In practice, two or more Bluetooth member devices may be included in the Bluetooth Audio broadcasting System 100. For convenience of illustration, only four exemplary bluetooth member devices are shown in the embodiment of fig. 1, namely a first bluetooth member device 110, a second bluetooth member device 120, a third bluetooth member device 130, and a fourth bluetooth member device 140.
In practical applications, the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 may be combined to form a multi-member bluetooth device, such as a multi-channel bluetooth speaker. In this case, the first, second, third and fourth Bluetooth member devices 110, 120, 130 and 140 may establish a Bluetooth piconet (Bluetooth piconet) in compliance with various Bluetooth communication standards, and may perform various command or data transmissions via the Bluetooth piconet, or the first, second, third and fourth Bluetooth member devices 110, 120, 130 and 140 may collectively form a coordination set (coordination set) in compliance with various Bluetooth communication standards.
Alternatively, the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 may belong to different multi-member bluetooth devices. For example, the first and second bluetooth member devices 110 and 120 may together form a first multi-member bluetooth device (e.g., a pair of bluetooth headsets), while the third and fourth bluetooth member devices 130 and 140 may together form a second multi-member bluetooth device (e.g., another pair of bluetooth headsets). In this case, the first bluetooth member device 110 and the second bluetooth member device 120 may establish a first bluetooth piconet in accordance with various bluetooth communication standards, and may perform various command or data transmissions through the first bluetooth piconet. Alternatively, the third bluetooth member device 130 and the fourth bluetooth member device 140 may establish a second bluetooth piconet using various protocols conforming to the bluetooth communication standard, and may perform various command or data transmissions via the second bluetooth piconet. Alternatively, the first bluetooth member device 110 and the second bluetooth member device 120 may jointly form a first cooperation group compliant with various bluetooth communication standards, and the third bluetooth member device 130 and the fourth bluetooth member device 140 may jointly form a first cooperation group compliant with various bluetooth communication standards.
In the embodiment of fig. 1, the first bluetooth member device 110 includes a first bluetooth communication circuit 111, a first audio processing circuit 112, a first audio playback circuit 113, and a first control circuit 114. Similarly, the second bluetooth member device 120 includes a second bluetooth communication circuit 121, a second audio processing circuit 122, a second audio playing circuit 123, and a second control circuit 124.
In the first bluetooth member device 110, the first bluetooth communication circuit 111 is configured to receive audio data broadcast by the audio broadcasting device 150 using BLE audio technology in a bluetooth communication manner. The first audio processing circuit 112 is coupled to the first audio playing circuit 113, and is configured to process audio data (e.g., encode or decode the audio data, and/or perform data format conversion) transmitted from the audio broadcasting device 150, and control the first audio playing circuit 113 to play the audio data. The first control circuit 114 is coupled to the first bluetooth communication circuit 111 and the first audio processing circuit 112, and configured to parse the bluetooth packets received by the first bluetooth communication circuit 111 to obtain related data or instructions, and to control the operation of the first audio processing circuit 112.
In some embodiments, the first control circuit 114 is further configured to control the first Bluetooth member device 110 to act as a Bluetooth master (Bluetooth Central) device in a Bluetooth piconet, and to adjust a clock signal (clock signal) used by the first Bluetooth member device 110 to synchronize piconet clocks (piconet clocks) used between the first Bluetooth member device 110 and other Bluetooth devices.
The first control circuit 114 may communicate with other bluetooth member devices through the first bluetooth communication circuit 111. The first control circuit 114 can also process the audio data from the audio broadcasting device 150 by using the first audio processing circuit 112, and instruct the first audio processing circuit 112 to control the first audio playing circuit 113 to play the audio data.
In the second bluetooth member device 120, the second bluetooth communication circuit 121 is configured to receive the audio data broadcasted by the audio broadcasting device 150 using BLE audio technology in a bluetooth communication manner. The second audio processing circuit 122 is coupled to the second audio playing circuit 123 and configured to process audio data (e.g., encode or decode the audio data and/or perform data format conversion) transmitted from the audio broadcasting device 150 and control the second audio playing circuit 123 to play the audio data. The second control circuit 124 is coupled to the second bluetooth communication circuit 121 and the second audio processing circuit 122, and configured to parse the bluetooth packets received by the second bluetooth communication circuit 121 to obtain related data or instructions, and to control the operation of the second audio processing circuit 122. The second control circuit 124 is also configured to adjust a clock signal used by the second bluetooth member device 120 to synchronize the piconet clock used between the second bluetooth member device 120 and other bluetooth devices.
In this embodiment, the second control circuit 124 is further configured to control the second Bluetooth member device 120 to act as a Bluetooth slave (Bluetooth Peripheral) in the aforementioned Bluetooth piconet, and to adjust a clock signal used by the second Bluetooth member device 120 to synchronize the piconet clock used between the second Bluetooth member device 120 and the first Bluetooth member device 110.
The second control circuit 124 may communicate with other bluetooth member devices through the second bluetooth communication circuit 121. The second control circuit 124 can also process the audio data from the audio broadcasting device 150 by using the second audio processing circuit 122, and instruct the second audio processing circuit 122 to control the second audio playing circuit 123 to play the audio data.
In practice, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may be implemented by suitable bluetooth transmission circuits capable of supporting bluetooth protocol of the bluetooth core specification version 5.2 or later. The first audio processing Circuit 112 and the second audio processing Circuit 122 can be implemented by a digital operation Circuit, a microprocessor, an Application Specific Integrated Circuit (ASIC), or a digital-to-analog converter (DAC) capable of performing various encoding and decoding processes and/or data format conversion on the audio data signal. The first audio playback circuit 113 and the second audio playback circuit 123 can be implemented by various suitable circuits capable of receiving the played audio data, such as various types of speakers. The first control circuit 114 and the second control circuit 124 can be implemented by various packet processing circuits, digital processing circuits, microprocessors, or application specific integrated circuits with suitable computing capabilities capable of parsing and generating bluetooth packets.
In some embodiments, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may be designed to simultaneously support suitable bluetooth transmission circuits of bluetooth communication protocols of earlier bluetooth versions (e.g., bluetooth 2.0, bluetooth 3.0, bluetooth 4.0, bluetooth 4.2, etc.). In this case, the first control circuit 114 and the second control circuit 124 are also designed to parse and generate bluetooth packets defined by the bluetooth protocol of the earlier bluetooth version.
In addition, the different functional blocks of the first Bluetooth member device 110 may be implemented by different circuits, and may be integrated into a single Bluetooth control chip (Bluetooth controller IC) or a single wearable Bluetooth device (e.g., Bluetooth headset). In addition, the first bluetooth communication circuit 111 may be coupled to an additional antenna device (not shown) if necessary. Similarly, the different functional blocks of the second Bluetooth member device 120 may be implemented by different circuits, and may be integrated into a single Bluetooth control chip (Bluetooth controller IC) or a single wearable Bluetooth device (e.g., Bluetooth headset). In addition, the second bluetooth communication circuit 121 may be coupled to an additional antenna device (not shown) if necessary.
In some embodiments, the first audio processing circuit 112 and the second audio processing circuit 122 may be integrated into the first control circuit 114 and the second control circuit 124, respectively.
In other words, the first audio processing circuit 112 and the first control circuit 114 may be implemented by different circuits, or may be implemented by the same circuit. Similarly, the second audio processing circuit 122 and the second control circuit 124 may be implemented by different circuits, or may be implemented by the same circuit.
The main circuit configuration and implementation of other bluetooth member devices in the bluetooth audio broadcasting system 100 are similar to those of the first bluetooth member device 110 or the second bluetooth member device 120, but different additional circuit elements may be disposed in different bluetooth member devices, and the circuit configurations of all bluetooth member devices are not limited to be identical.
As previously described, the audio broadcaster 150 may broadcast various audio data using BLE audio technology as specified by the bluetooth core specification version 5.2 or later. In operation, the audio broadcasting device 150 may Broadcast one or more Bluetooth low energy (LE audio packets) packets containing audio data via a Broadcast Isochronous Stream (BIS) logical transport channel (hereinafter referred to as BIS logical transport channel).
In fact, the audio broadcasting device 150 can be implemented by various suitable circuits or devices supporting bluetooth protocol of bluetooth core specification version 5.2 or later and capable of broadcasting audio data by using BLE audio technology, such as an audio broadcasting system, a voice navigation system, a voice broadcasting system, a desktop computer, a notebook computer, a tablet computer, a mobile communication device (e.g., a mobile phone), a wearable device, an onboard audio system, or a bluetooth smart speaker.
However, the BLE audio technology proposed by the bluetooth core specification version 5.2 does not specify how the audio source terminal should adjust the volume playing size of the audio sink in the process of performing audio broadcasting by using the BIS logical transmission channel, and does not require the audio source terminal to adjust the volume playing size of the audio sink. Therefore, certain problems may be derived when using BLE audio technology for audio broadcasting. For example, an audio broadcast with an unexpected volume may cause some users to feel uncomfortable or unpleasant, and even some users may be surprised by receiving an audio broadcast with a sudden and excessive volume.
To solve the blind spot of the existing BLE audio technology of bluetooth core specification version 5.2 in audio broadcasting application, the bluetooth audio broadcasting system 100 disclosed in the foregoing will use a special mechanism to perform the audio data broadcasting operation.
The operation of the bluetooth audio broadcasting system 100 will be further described with reference to fig. 2. Fig. 2 is a simplified flowchart of a method for performing audio broadcasting by using BLE audio technology according to a first embodiment of the present invention.
In the flowchart of fig. 2, the process in the column of a specific device represents the process performed by the specific device. For example, the part marked in the "audio broadcaster" field is the process performed by the audio broadcaster 150; the portion marked in the "first bluetooth member device" column is the process performed by the first bluetooth member device 110; the part marked in the "second bluetooth member device" field is the process performed by the second bluetooth member device 120; the logic described above is also applicable to other flowcharts that follow.
When the user wants to receive the audio broadcast using the first bluetooth member device 110 and the second bluetooth member device 120, the first bluetooth member device 110 may perform the process 202 in fig. 2, and the second bluetooth member device 120 may perform the process 204 in fig. 2.
In the process 202, the first control circuit 114 can control the first bluetooth communication circuit 111 to enter a predetermined receiving mode.
In the process 204, the second control circuit 124 may control the second bluetooth communication circuit 121 to enter the predetermined receiving mode.
The predetermined reception mode refers to various operation modes that can be used to receive various bluetooth advertisement packets, various Broadcast Isochronous stream Protocol Data Units (PDUs) (hereinafter referred to as BIS protocol data units, BIS PDUs), and/or various Broadcast Isochronous Group (BIG) protocol data units (hereinafter referred to as BIG protocol data units, BIG PDUs).
For example, the predetermined receiving mode may be a low power Extended Passive Scan (LE Extended Passive Scan) mode, a low power Extended Active Scan (LE Extended Active Scan) mode, a low power Extended Initiator (LE Extended Initiator) mode, or a Periodic Scan (Periodic Scan) mode, which can be used to receive various bluetooth advertisement packets. For another example, the predetermined receiving mode may be an operation mode that can receive various pdus through the BIS logical transmission channel and/or can receive various pdus through a broadcast isochronous group logical transmission channel (hereinafter, referred to as "BIG logical transmission channel"), such as a Periodic Synchronization (Periodic Synchronization) mode, a broadcast isochronous group Synchronization (BIG Synchronization) mode, or the like. Alternatively, the predetermined receiving mode may be a combination of the above-mentioned operation modes.
As shown in fig. 2, when the audio broadcasting device 150 needs to perform audio broadcasting, the audio broadcasting device 150 may perform a process 206 in fig. 2.
In process 206, the audio broadcasting device 150 may enter a predetermined transmission mode. The predetermined transmission mode refers to various operation modes that can be used to transmit various bluetooth advertisement packets, various BIS protocol data units, and/or various BIG protocol data units.
For example, the predetermined transmission mode may be an advertisement mode (Advertising mode), a Scannable mode (Scannable mode), a Connectable mode (Connectable mode), a Non-Connectable mode (Non-Connectable mode), a Non-Scannable mode (Non-Scannable mode), a Periodic advertisement mode (Periodic Advertising mode), a low power consumption Extended advertisement mode (LE Extended Advertising mode), or a low power consumption Periodic advertisement mode (LE Periodic Advertising mode). For another example, the predetermined transmission mode may be a Broadcast Isochronous mode (Broadcast Isochronous mode) in which various BIS PDUs are transmitted through the BIS logical transmission channel and/or various BIG PDU are transmitted through the BIG logical transmission channel. Alternatively, the predetermined transmission mode may be a combination of the aforementioned operation modes.
In the process 208, the audio broadcasting device 150 may insert a predetermined volume indication corresponding to a predetermined volume (predetermined volume) into one or more predetermined data items. The audio broadcasting device 150 can set the predetermined volume level to be comfortable for most people without feeling excessive volume (e.g., about 45-60 db), and can express the predetermined volume level by using various suitable data formats, index values, or numerical values. In operation, the audio broadcasting device 150 may insert the predetermined volume indication into one or more specific fields of one predetermined data item, or may insert the predetermined volume indication into specific fields of a plurality of predetermined data items. In some embodiments, in addition to the predetermined volume indication, the audio broadcasting device 150 may also insert a bluetooth address of the audio broadcasting device 150 and/or an indication that the audio broadcasting device 150 will start audio broadcasting into the single or multiple specific fields of the single predetermined data item together or separately.
For example, in some embodiments where the predetermined data items are various bluetooth advertisement packets, the audio broadcasting device 150 may insert the predetermined volume indication, the bluetooth address of the audio broadcasting device 150, and/or the indication information into a single or multiple specific fields of a single bluetooth advertisement packet or into specific fields of multiple bluetooth advertisement packets separately.
For another example, in some embodiments where the predetermined data items are various BIS protocol data units or BIG protocol data units, the audio broadcasting device 150 may insert the predetermined volume indication, the bluetooth address of the audio broadcasting device 150, and/or the indication information into a single or multiple specific fields of a single BIS protocol data unit or BIG protocol data unit, or insert the predetermined volume indication, the bluetooth address of the audio broadcasting device 150, and/or the indication information into multiple specific fields of a plurality of BIS protocol data units or BIG protocol data units. In fact, the specific field may be an Event count (Event Counter) field, a Sub-Event count (Sub-Event Counter) field, or a load count (Payload Counter) field in the BIS protocol data unit or the BIG protocol data unit.
In the process 210, the audio broadcasting device 150 can transmit the one or more predetermined data items in the predetermined transmission mode, so that the first bluetooth member device 110 and the second bluetooth member device 120 and other bluetooth devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) within the bluetooth signal transmission range of the audio broadcasting device 150 can receive the one or more predetermined data items.
For example, in some embodiments where the predetermined transmission mode is a scannable mode, a connectable mode, a non-connectable mode, or a non-scannable mode, the one or more predetermined data items referred to in the processes 208 and 210 may be one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets. Alternatively, the one or more predetermined data items referred to in the aforementioned flows 208 and 210 may be a set of one or more advertisement extended indication (ADV _ EXT _ IND) packets and one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets.
In this case, if the predetermined receiving mode is the low power expansion passive scanning mode, the low power expansion active scanning mode, or the low power expansion initiator mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform the process 212 to receive one or more predetermined data items from the audio broadcasting apparatus 150.
For another example, in some embodiments where the predetermined transmission mode is an unavailable mode or an unavailable scan mode, the one or more predetermined data items referred to in the processes 208 and 210 may be one or more auxiliary link indication (AUX _ CHAIN _ IND) packets. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may be a set of one or more advertisement expansion indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, and one or more auxiliary link indication (AUX _ CHAIN _ IND) packets.
In this case, if the predetermined receiving mode is the low power expansion passive scanning mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform the process 212 to receive one or more predetermined data items from the audio broadcasting device 150.
For another example, in some embodiments where the predetermined transmission mode is a scannable mode, the one or more predetermined data items referred to in the processes 208 and 210 may be one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may be a set of one or more advertisement expansion indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, and one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may also be a set of one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets and one or more auxiliary link indication (AUX _ CHAIN _ IND) packets. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may be a set of one or more advertisement expansion indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets, and one or more auxiliary link indication (AUX _ CHAIN _ IND) packets.
In this case, if the predetermined receiving mode is the low power expansion active scanning mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform the process 212 to receive one or more predetermined data items from the audio broadcasting device 150.
For another example, in some embodiments where the predetermined transmission mode is an offline mode, an unscanning mode, a periodic advertisement mode, a low-power extended advertisement mode, or a low-power periodic advertisement mode, the one or more predetermined data items referred to in the processes 208 and 210 may be one or more auxiliary synchronization indication (AUX _ SYNC _ IND) packets. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may be a set of one or more advertisement expansion indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, and one or more auxiliary synchronization indication (AUX _ SYNC _ IND) packets.
In this case, if the predetermined receiving mode is the periodic scanning mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 can perform the process 212 to receive one or more predetermined data items from the audio broadcasting device 150.
For another example, in some embodiments where the predetermined transmission mode is an advertisement mode specified by bluetooth protocol version 4.0, the one or more predetermined data items referred to in the process 208 and the process 210 may be one or more advertisement indication (ADV _ IND) packets, one or more non-connectable advertisement indication (ADV _ non _ IND) packets, or one or more viewable advertisement indication (ADV _ DISCOVER _ IND) packets. Alternatively, the one or more predetermined data items referred to in the process 208 and the process 210 may be a set of one or more advertisement indication (ADV _ IND) packets and one or more non-connectable advertisement indication (ADV _ non _ IND) packets. Alternatively, the one or more predetermined data items referred to in the process 208 and the process 210 may be a set of one or more advertisement indication (ADV _ IND) packets and one or more observable advertisement indication (ADV _ DISCOVER _ IND) packets. Alternatively, the one or more predetermined data items referred to in the process 208 and the process 210 may be a set of one or more advertisement indication (ADV _ IND) packets, one or more non-connectable advertisement indication (ADV _ non _ IND) packets, and one or more observable advertisement indication (ADV _ DISCOVER _ IND) packets.
In this case, if the predetermined receiving mode is a mode capable of receiving the predetermined data item, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 can perform the process 212 to receive one or more predetermined data items from the audio broadcasting apparatus 150.
For another example, in some embodiments where the scheduled transmission mode is an isochronous broadcast mode or a broadcast isochronous mode, the one or more scheduled data items referred to in the processes 208 and 210 may be one or more BIS protocol data units. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may be one or more BIG protocol data units. Alternatively, the one or more predetermined data items referred to in the aforementioned processes 208 and 210 may be a set of one or more BIS protocol data units and one or more BIG protocol data units.
In this case, if the predetermined receiving mode is an operation mode that can receive various pdus through the BIS logical transmission channel and/or can receive various pdus through the BIG logical transmission channel, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 can perform the process 212 to receive one or more predetermined data items from the audio broadcasting device 150.
Next, the first bluetooth member device 110 proceeds to process 214 and process 216, and the second bluetooth member device 120 proceeds to process 218 and process 220.
In block 214, the first control circuit 114 parses one or more predetermined data items received by the first bluetooth communication circuit 111 to obtain a predetermined volume indication corresponding to a predetermined volume level. In some embodiments, the first control circuit 114 can also obtain a bluetooth address of the audio broadcasting device 150 and/or an indication that the audio broadcasting device 150 will start audio broadcasting from one or more predetermined data items received by the first bluetooth communication circuit 111.
In the process 216, the first control circuit 114 can control the first audio processing circuit 112 to preset a volume of the first audio playing circuit 113 according to the predetermined volume indication. In operation, the first control circuit 114 can control the first audio processing circuit 112 to preset the gain value of the first audio playing circuit 113 according to a predetermined volume indication, so as to set the volume of the first audio playing circuit 113.
In the process 218, the second control circuit 124 may parse one or more predetermined data items received by the second bluetooth communication circuit 121 to obtain a predetermined volume indication corresponding to a predetermined volume level. In some embodiments, the second control circuit 124 can also obtain a bluetooth address of the audio broadcasting device 150 and/or an indication that the audio broadcasting device 150 will start to broadcast audio from one or more predetermined data items received by the second bluetooth communication circuit 121.
In the process 220, the second control circuit 124 controls the second audio processing circuit 122 to preset a volume of the second audio playing circuit 123 according to the predetermined volume indication. In operation, the second control circuit 124 controls the second audio processing circuit 122 to preset the gain value of the second audio playing circuit 123 according to a predetermined volume indication, so as to set the volume of the second audio playing circuit 123.
The predetermined volume indicators received by the first bluetooth member device 110 and the second bluetooth member device 120 correspond to a predetermined volume level set by the audio broadcasting device 150. As mentioned above, the predetermined volume level is comfortable for most people without excessive volume, e.g., about 45-60 dB.
In the aforementioned process 216, the first control circuit 114 can control the first audio processing circuit 112 to set the gain value of the first audio playing circuit 113 according to the predetermined volume indication, so as to preset the volume of the first audio playing circuit 113 to be close to or equal to the predetermined volume.
Similarly, in the aforementioned process 220, the second control circuit 124 can control the second audio processing circuit 122 to set the gain value of the second audio playing circuit 123 according to the predetermined volume indication, so as to preset the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume.
In other words, in the embodiment, before the first bluetooth member device 110 and the second bluetooth member device 120 play the audio data transmitted from the audio broadcasting device 150, the volume levels of the first audio playing circuit 113 and the second audio playing circuit 123 are adjusted to be close to or equal to the predetermined volume levels according to the predetermined volume indications transmitted from the audio broadcasting device 150.
In the process 222, the audio broadcasting device 150 may generate one or more Bluetooth Low Energy (LE) audio packets including predetermined audio data. In operation, the audio broadcasting device 150 may encode predetermined audio data using a Low Complexity Communication Codec (LC3), and insert the encoded data into one or more bluetooth Low energy audio packets. In fact, the audio broadcasting device 150 may also encode the predetermined audio data by using other suitable encoding methods.
In the process 224, the audio broadcasting device 150 may broadcast one or more bluetooth low energy audio packets containing the predetermined audio data through one or more BIS logical transmission channels. In operation, the audio broadcasting device 150 may operate according to the BLE audio technology to broadcast the bluetooth low energy audio packets containing the predetermined audio data to other bluetooth member devices.
In process 226, the first bluetooth communication circuit 111 of the first bluetooth member device 110 receives one or more bluetooth low energy audio packets transmitted by the audio broadcasting device 150 via the one or more BIS logical transmission channels, and the second bluetooth communication circuit 121 of the second bluetooth member device 120 receives one or more bluetooth low energy audio packets transmitted by the audio broadcasting device 150 via the one or more BIS logical transmission channels.
Next, the first bluetooth member device 110 proceeds to process 228 and 230, and the second bluetooth member device 120 proceeds to process 232 and 234.
In block 228, the first control circuit 114 parses one or more bluetooth low energy audio packets received by the first bluetooth communication circuit 111 to obtain predetermined audio data generated by the audio broadcasting device 150.
In the process 230, the first control circuit 114 can instruct the first audio processing circuit 112 to control the first audio playing circuit 113 to play the predetermined audio data.
In the process 232, the second control circuit 124 parses one or more bluetooth low energy audio packets received by the second bluetooth communication circuit 121 to obtain predetermined audio data generated by the audio broadcasting device 150.
In the process 234, the second control circuit 124 may instruct the second audio processing circuit 122 to control the second audio playing circuit 123 to play the predetermined audio data.
Since the first bluetooth member device 110 and the second bluetooth member device 120 both receive the bluetooth low energy audio packets transmitted by the audio broadcasting device 150 through the BIS logical transmission channel, when the first audio playing circuit 113 plays the predetermined audio data, the second audio playing circuit 123 also plays the predetermined audio data synchronously. In other words, the process 230 and the process 234 are performed simultaneously.
The audio broadcasting device 150 can repeat the process 222 and the process 224 to broadcast the subsequent predetermined audio data. On the other hand, the first bluetooth member device 110 may repeat the process 226, the process 228, and the process 230 to receive and play the subsequent predetermined audio data, and the first bluetooth member device 110 may repeat the process 226, the process 232, and the process 234 to receive and play the subsequent predetermined audio data.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 100 can receive the bluetooth low energy audio packets broadcasted by the audio broadcasting device 150 and play the predetermined audio data in the bluetooth low energy audio packets according to the operation manner of the first bluetooth member device 110 or the second bluetooth member device 120.
As can be seen from the above descriptions of fig. 1 to fig. 2, before the predetermined audio data transmitted from the audio broadcasting device 150 starts to be played, the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume of the first audio playing circuit 113 and the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume according to the predetermined volume indication transmitted from the audio broadcasting device 150.
Therefore, when the first bluetooth member device 110 starts to play the predetermined audio data from the audio broadcasting device 150 by using the first audio playing circuit 113, the volume level emitted by the first audio playing circuit 113 is close to or equal to the predetermined volume level. Similarly, when the second bluetooth member device 120 starts to play the predetermined audio data from the audio broadcasting device 150 by using the second audio playing circuit 123, the volume level emitted by the second audio playing circuit 123 is close to or equal to the predetermined volume level.
In this way, the volume generated when the first audio playing circuit 113 and the second audio playing circuit 123 start to play the predetermined audio data synchronously can make the user feel comfortable without causing discomfort or displeasure.
In addition, since the volume levels of the first audio playback circuit 113 and the second audio playback circuit 123 when the first audio playback circuit and the second audio playback circuit start to synchronously play the predetermined audio data are preset to be close to or equal to the predetermined volume levels, even if the audio broadcasting apparatus 150 starts to perform the audio broadcasting without psychological expectation, the user is prevented from being scared due to the excessive volume of the audio broadcasting.
In the foregoing embodiment, the bluetooth audio broadcasting system 100 employs BLE audio technology for audio broadcasting, and the audio broadcasting apparatus 150 may encode predetermined audio data using a low complexity communication codec (LC 3). Therefore, compared to the conventional audio broadcasting method, the audio broadcasting method adopted by the bluetooth audio broadcasting system 100 can not only reduce the power consumption of the first bluetooth member device 110 and the second bluetooth member device 120, but also prolong the service time of the first bluetooth member device 110 and the second bluetooth member device 120, and effectively improve the overall audio quality of the audio broadcasting.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 100 adjust the volume of the corresponding audio playing circuit (not shown) to be close to or equal to the predetermined volume according to the predetermined volume indication from the audio broadcasting device 150 before starting to play the predetermined audio data from the audio broadcasting device 150.
In this way, the volume level emitted by the other bluetooth member devices in the bluetooth audio broadcasting system 100 when they start to synchronously play the predetermined audio data can be comfortable for the user without causing discomfort or annoyance to the user.
Referring to fig. 3, a simplified functional block diagram of a bluetooth audio broadcasting system 200 according to a second embodiment of the invention is shown. Similar to the bluetooth audio broadcasting system 100 of fig. 1, the bluetooth audio broadcasting system 200 of fig. 3 also includes an audio broadcasting device 150 and a plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140). In addition, the bluetooth audio broadcasting system 200 further comprises an audio source device 370.
The audio source device 370 is configured to receive the sound emitted by the user to generate a corresponding audio signal AS, and transmit the audio signal AS to the audio broadcasting device 150 by using various wired or wireless transmission methods. In the embodiment of fig. 3, the audio broadcasting device 150 is further configured to convert the audio signal AS from the audio source device 370 into predetermined audio data to be broadcasted. In other words, in the embodiment of fig. 3, the content of the predetermined audio data broadcasted by the audio broadcasting device 150 is originated from the audio source device 370.
In operation, the audio broadcasting device 150 may broadcast predetermined audio data using BLE audio technology specified by the bluetooth core specification version 5.2 or later. As in the embodiment of fig. 1, the audio broadcasting device 150 may broadcast the bluetooth low energy audio packet including the predetermined audio data to a plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 shown in fig. 3) in the bluetooth audio broadcasting system 200 through the BIS logical transmission channel.
Each bluetooth member device in the bluetooth audio broadcasting system 200 can receive and play the predetermined audio data broadcasted by the audio broadcasting device 150 in a manner similar to that of the corresponding device in the embodiment of fig. 1.
In the embodiment of fig. 3, the audio source device 370 is further configured to generate and transmit a volume adjusting signal VAS to the audio broadcasting device 150 according to the operation or instruction of the user during the audio broadcasting process of the audio broadcasting device 150. The audio broadcasting device 150 can generate a corresponding volume adjustment indication according to the volume adjustment signal VAS generated by the audio source device 370, and transmit the volume adjustment indication to the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 to indicate the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 to adjust the volume of the broadcast.
In other words, the bluetooth audio broadcasting system 200 can dynamically adjust the volume levels of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130 and the fourth bluetooth member device 140 according to the user's operation or instruction during the audio broadcasting process.
In practice, the audio source device 370 may be implemented by various suitable circuits capable of receiving and converting the audio signal AS, generating the volume-adjusting signal VAS according to the operation or instruction of the user, and supporting suitable signal transmission methods, such AS a notebook computer, a tablet computer, a mobile communication device (e.g., a mobile phone), a wearable device, a video conference system, or various types of wireless microphones.
The above description of the other circuits and devices in the bluetooth audio broadcasting system 100 and the connection method are also applicable to the bluetooth audio broadcasting system 200 of fig. 3. For the sake of brevity, the description is not repeated here.
The operation of the bluetooth audio broadcasting system 200 will be further described with reference to fig. 4 to 5. Fig. 4 to 5 are simplified flowcharts of a method for performing audio broadcasting by using BLE audio technology according to a second embodiment of the present invention. Basically, the operations of the processes 202 to 234 in fig. 4 are the same as the corresponding processes in the embodiment of fig. 2.
For example, similar to the embodiment of fig. 2, when the user wants to receive an audio broadcast by the first bluetooth member device 110 and the second bluetooth member device 120 in the bluetooth audio broadcasting system 200, the first bluetooth member device 110 can perform the process 202 of fig. 4, and the second bluetooth member device 120 can perform the process 204 of fig. 4.
AS described above, the audio broadcasting apparatus 150 in the embodiment of fig. 3 can convert the audio signal AS from the audio source apparatus 370 into predetermined audio data to be broadcasted and perform audio broadcasting. As shown in fig. 4, when the audio broadcasting device 150 needs to perform audio broadcasting, the processes 206 to 210 in fig. 4 can be performed as well.
The first bluetooth member device 110 may then perform the processes 212, 214, and 216 of fig. 4, while the second bluetooth member device 120 may perform the processes 212, 218, and 220 of fig. 4.
After the process 210, the audio broadcasting apparatus 150 further performs processes 222 and 224 in fig. 4. On the other hand, the first bluetooth member device 110 may perform the processes 226, 228, and 230 of fig. 4, and the second bluetooth member device 120 may perform the processes 226, 232, and 234 of fig. 4.
Similarly, the audio broadcasting device 150 can repeat the process 222 and the process 224 to broadcast the subsequent predetermined audio data. On the other hand, the first bluetooth member device 110 may repeat the process 226, the process 228, and the process 230 to receive and play the subsequent predetermined audio data, and the first bluetooth member device 110 may repeat the process 226, the process 232, and the process 234 to receive and play the subsequent predetermined audio data.
As mentioned above, the bluetooth audio broadcasting system 200 can dynamically adjust the volume of the plurality of bluetooth member devices in the bluetooth audio broadcasting system 200 according to the operation or instruction of the user during the audio broadcasting process.
For example, during the audio broadcasting process of the audio broadcasting device 150 (i.e., during the process of the audio broadcasting device 150 repeating the process 222 and the process 224 of fig. 4), if the user of the audio source device 370 wants to adjust the volume levels of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140, the user can perform a specific operation or issue a specific command to the audio source device 370, so that the audio source device 370 generates and transmits a volume adjustment signal VAS to the audio broadcasting device 150.
As shown in fig. 5, the audio broadcasting device 150 may perform a flow 502 in fig. 5 when receiving the volume adjusting signal VAS.
In block 502, the audio broadcasting device 150 may insert a volume adjustment indication indicating a volume adjustment direction (e.g., up or down) into one or more target data items. In some embodiments, the aforementioned volume adjustment indication may be used to indicate an adjustment amount of the volume, such as 3%, 5%, 10%, 15%, 1 db, 2 db, 3 db, 5 db, etc., in addition to the volume adjustment direction. In operation, the audio broadcasting device 150 may insert the volume adjustment indication into a single or multiple specific fields of a single targeted data item, or may insert the volume adjustment indication into specific fields of multiple targeted data items in a distributed manner.
For example, in some embodiments where the targeted data items are various bluetooth advertisement packets, the audio broadcasting device 150 may insert the volume adjustment indication into a single or multiple specific fields of a single bluetooth advertisement packet, or into specific fields of multiple bluetooth advertisement packets in a distributed manner.
For another example, in some embodiments where the target data items are various BIS protocol data units or BIG protocol data units, the audio broadcasting device 150 may insert the volume adjustment indication into a single or multiple specific fields of a single BIS protocol data unit or BIG protocol data unit, or insert the volume adjustment indication into multiple specific fields of a plurality of BIS protocol data units or BIG protocol data units. In fact, the specific field may be an Event count (Event Counter) field, a Sub-Event count (Sub-Event Counter) field, or a load count (Payload Counter) field in the BIS protocol data unit or the BIG protocol data unit.
In process 504, the audio broadcasting device 150 can transmit the one or more target data items in a target transmission mode so that the first bluetooth member device 110 and the second bluetooth member device 120, and other bluetooth devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) within the bluetooth signal transmission range of the audio broadcasting device 150 can receive the one or more target data items.
For example, in some embodiments where the target transmission mode is a scannable mode, an available mode, an unavailable mode, or an unavailable mode, the one or more target data items referred to in the processes 502 and 504 may be one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets. Alternatively, the one or more target data items referred to in the aforementioned processes 502 and 504 may be a set of one or more advertisement extension indication (ADV _ EXT _ IND) packets and one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets.
In this case, if the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 operate in the low power expansion passive scanning mode, the low power expansion active scanning mode, or the low power expansion initiator mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform the process 506 to receive one or more target data items from the audio broadcasting apparatus 150.
For another example, in some embodiments where the aforementioned target transmission mode is a non-link mode or a non-scan mode, the one or more target data items referred to in the processes 502 and 504 may be one or more auxiliary link indicator (AUX _ CHAIN _ IND) packets. Alternatively, the one or more target data items referred to in the aforementioned processes 502 and 504 may be a set of one or more advertisement extension indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, and one or more auxiliary link indication (AUX _ CHAIN _ IND) packets.
In this case, if the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 operate in the low power expansion passive scanning mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform the process 506 to receive one or more target data items from the audio broadcasting apparatus 150.
For another example, in some embodiments in which the target transmission mode is a scannable mode, the one or more target data items referred to in the processes 502 and 504 may be one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets. Alternatively, the one or more target data items referred to in the aforementioned processes 502 and 504 may be a set of one or more advertisement extension indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, and one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets. Alternatively, the one or more target data items referred to in the processes 502 and 504 may be a set of one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets and one or more auxiliary link indication (AUX _ CHAIN _ IND) packets. Alternatively, the one or more target data items referred to in the aforementioned processes 502 and 504 may be a set of one or more advertisement expansion indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, one or more auxiliary SCAN response (AUX _ SCAN _ RSP) packets, and one or more auxiliary link indication (AUX _ CHAIN _ IND) packets.
In this case, if the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 operate in the low power expansion active scanning mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform the process 506 to receive one or more target data items from the audio broadcasting apparatus 150.
For another example, in some embodiments where the target delivery mode is a non-link mode, a non-scan mode, a periodic advertisement mode, a low power extended advertisement mode, or a low power periodic advertisement mode, the one or more target data items referred to in the processes 502 and 504 may be one or more auxiliary synchronization indication (AUX _ SYNC _ IND) packets. Alternatively, the one or more target data items referred to in the aforementioned processes 502 and 504 may be a set of one or more advertisement extension indication (ADV _ EXT _ IND) packets, one or more auxiliary advertisement indication (AUX _ ADV _ IND) packets, and one or more auxiliary synchronization indication (AUX _ SYNC _ IND) packets.
In this case, if the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 operate in the periodic scanning mode, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform a process 506 to receive one or more target data items from the audio broadcasting device 150.
For another example, in some embodiments where the target delivery mode is an advertisement mode specified by the bluetooth protocol version 4.0, the one or more target data items referred to in the processes 502 and 504 may be one or more advertisement indicator (ADV _ IND) packets, one or more non-connectable advertisement indicator (ADV _ non _ IND) packets, or one or more searchable advertisement indicator (ADV _ DISCOVER _ IND) packets. Alternatively, the one or more target data items referred to in the processes 502 and 504 may be a set of one or more advertisement indication (ADV _ IND) packets and one or more non-connectable advertisement indication (ADV _ non _ IND) packets. Alternatively, the one or more target data items referred to in the process 502 and the process 504 may be a set of one or more advertisement indication (ADV _ IND) packets and one or more observable advertisement indication (ADV _ DISCOVER _ IND) packets. Alternatively, the one or more target data items referred to in the processes 502 and 504 may be a set of one or more advertisement indication (ADV _ IND) packets, one or more non-connectable advertisement indication (ADV _ non _ IND) packets, and one or more observable advertisement indication (ADV _ DISCOVER _ IND) packets.
In this case, if the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 are operated in a mode capable of receiving the target data items, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 may perform a process 506 to receive one or more target data items from the audio broadcasting apparatus 150.
For another example, in some embodiments where the target transmission mode is an isochronous broadcast mode or a broadcast isochronous mode, the one or more target data items referred to in the processes 502 and 504 may be one or more BIS protocol data units. Alternatively, the one or more nominal data items referred to in the processes 502 and 504 may be one or more BIG protocol data units. Alternatively, the one or more nominal data items referred to in the processes 502 and 504 may be a set of one or more BIS protocol data units and one or more BIG protocol data units.
In this case, if the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 operate in an operation mode that can receive various pdus through the BIS logical transmission channel and/or can receive various pdus through the BIG logical transmission channel, the first bluetooth communication circuit 111 and the second bluetooth communication circuit 121 can perform the process 506 to receive one or more target data items from the audio broadcasting apparatus 150.
Next, the first bluetooth member device 110 proceeds to process 508 and process 510, and the second bluetooth member device 120 proceeds to process 512 and process 514.
In process 508, the first control circuit 114 can parse the one or more target data items received by the first bluetooth communication circuit 111 to obtain a volume adjustment indication.
In the process 510, the first control circuit 114 can control the first audio processing circuit 112 to adjust a volume of the first audio playing circuit 113 according to the volume adjustment indication. In operation, the first control circuit 114 can control the first audio processing circuit 112 to adjust the gain value of the first audio playing circuit 113 according to the volume adjustment indication, so as to adjust the volume of the first audio playing circuit 113.
In the process 512, the second control circuit 124 may parse the one or more target data items received by the second bluetooth communication circuit 121 to obtain a volume adjustment indication.
In the process 514, the second control circuit 124 controls the second audio processing circuit 122 to adjust a volume of the second audio playing circuit 123 according to the volume adjustment indication. In operation, the second control circuit 124 controls the second audio processing circuit 122 to adjust the gain of the second audio playing circuit 123 according to the volume adjustment indication, so as to adjust the volume of the second audio playing circuit 123.
Since the first bluetooth member device 110 and the second bluetooth member device 120 both adjust the volume according to the volume adjustment indication in the target data item sent by the audio broadcasting device 150, when the first audio processing circuit 112 adjusts the volume of the first audio playing circuit 113, the second audio processing circuit 122 also synchronously adjusts the volume of the second audio playing circuit 123. In other words, the process 510 and the process 510 are performed synchronously.
As shown in fig. 5, after the aforementioned process 504, the audio broadcasting apparatus 150 may repeat the processes 222 and 224 in fig. 4 to broadcast the subsequent predetermined audio data. After performing the process 510, the first bluetooth member device 110 may repeat the processes 226, 228, and 230 of fig. 4 to receive and play the subsequent predetermined audio data. After the process 514, the second bluetooth member device 110 may repeat the processes 226, 232 and 234 of fig. 4 to receive and play the subsequent predetermined audio data.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 200 can receive the bluetooth low energy audio packets broadcasted by the audio broadcasting device 150, play the predetermined audio data in the bluetooth low energy audio packets, and synchronously adjust the volume according to the volume adjustment indication in the target data item sent by the audio broadcasting device 150 according to the operation manner of the first bluetooth member device 110 or the second bluetooth member device 120.
In other words, during the process of the first bluetooth member device 110 and the second bluetooth member device 120 playing the audio data broadcasted by the audio broadcasting device 150, the audio source device 370 may instruct the audio broadcasting device 150 to broadcast a volume adjustment instruction to the first bluetooth member device 110 and the second bluetooth member device 120 according to the operation or the instruction of the user, so as to synchronously adjust the volume of the first bluetooth member device 110 and the second bluetooth member device 120.
Similarly, during the process of playing the audio data broadcasted by the audio broadcasting device 150 by the third bluetooth member device 130 and the fourth bluetooth member device 140, the audio source device 370 may instruct the audio broadcasting device 150 to broadcast a volume adjustment instruction to the third bluetooth member device 130 and the fourth bluetooth member device 140 according to the operation or the instruction of the user, so as to synchronously adjust the volume of the third bluetooth member device 130 and the fourth bluetooth member device 140.
As can be seen from the above descriptions of fig. 3 to fig. 5, before the multi-member bluetooth device in the bluetooth audio broadcasting system 200 starts to play the predetermined audio data transmitted from the audio broadcasting device 150, the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume of the first audio playing circuit 113 and the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume according to the predetermined volume indication transmitted from the audio broadcasting device 150.
Therefore, when the first bluetooth member device 110 starts to play the predetermined audio data from the audio broadcasting device 150 by using the first audio playback circuit 113, the volume level emitted by the first audio playback circuit 113 is close to or equal to the predetermined volume level. Similarly, when the second bluetooth member device 120 starts to play the predetermined audio data from the audio broadcasting device 150 by using the second audio playing circuit 123, the volume level emitted by the second audio playing circuit 123 is close to or equal to the predetermined volume level.
In this way, the volume generated when the first audio playing circuit 113 and the second audio playing circuit 123 start to play the predetermined audio data synchronously can make the user feel comfortable without causing discomfort or displeasure.
In addition, since the volume levels of the first audio playback circuit 113 and the second audio playback circuit 123 when the first audio playback circuit and the second audio playback circuit start to synchronously play the predetermined audio data are preset to be close to or equal to the predetermined volume levels, even if the audio broadcasting apparatus 150 starts to perform the audio broadcasting without psychological expectation, the user is prevented from being scared due to the excessive volume of the audio broadcasting.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 200 adjust the volume of the corresponding audio playing circuit (not shown) to be close to or equal to the predetermined volume according to the predetermined volume indication from the audio broadcasting device 150 before starting to play the predetermined audio data from the audio broadcasting device 150. Therefore, the volume level emitted by the other bluetooth member devices in the bluetooth audio broadcasting system 200 when they start to synchronously play the predetermined audio data can also be comfortable for the user without causing discomfort or discomfort to the user.
In addition, during the process of the multiple bluetooth devices in the bluetooth audio broadcasting system 200 playing the audio data broadcasted by the audio broadcasting device 150, the audio source device 370 may further instruct the audio broadcasting device 150 to broadcast a volume adjustment instruction to the respective bluetooth devices according to the operation or instruction of the user, so as to synchronously adjust the volume of the respective bluetooth devices. In other words, the bluetooth audio broadcasting system 200 allows the user to adjust the volume of different bluetooth member devices in the bluetooth audio broadcasting system 200 synchronously.
Furthermore, the bluetooth audio broadcasting system 200 employs BLE audio technology for audio broadcasting, and the audio broadcasting apparatus 150 may encode predetermined audio data using a low complexity communication codec (LC 3). Therefore, compared to the conventional audio broadcasting method, the audio broadcasting method adopted by the bluetooth audio broadcasting system 200 can not only reduce the power consumption of the multi-member bluetooth devices, thereby prolonging the service time of the multi-member bluetooth devices, but also effectively improve the overall audio quality of the audio broadcasting.
Referring to fig. 6, a simplified functional block diagram of a bluetooth audio broadcasting system 200 according to a third embodiment of the invention is shown. Similar to the bluetooth audio broadcasting system 200 of fig. 3, the bluetooth audio broadcasting system 200 of fig. 6 also includes an audio broadcasting device 150, a plurality of bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140), and an audio source device 370. In addition, the bluetooth audio broadcasting system 200 in fig. 6 further includes a master device 660.
In the bluetooth audio broadcasting system 200, the host 660 is configured to generate and transmit a volume adjusting signal VAS to the audio broadcasting device 150 according to the operation or instruction of the user.
As shown in fig. 6, the master device 660 includes a communication circuit 661, an input circuit 663, and a processing circuit 665. The communication circuit 661 is configured to communicate various data and commands with the audio broadcasting device 150 and the audio source device 370 using various wired or wireless transmission methods. The input circuit 663 is configured to allow a user of the master control device 660 to perform various operations on the master control device 660, such as inputting instructions, setting a volume adjustment direction, or setting a volume adjustment amount. The processing circuit 665 is coupled to the communication circuit 661 and the input circuit 663, and is configured to control the audio source device 370 through the communication circuit 661, or receive commands from the audio source device 370. The processing circuit 665 is further configured to generate a volume-adjusting signal VAS according to the operation of the input circuit 663 by the user, and transmit the volume-adjusting signal VAS to the audio broadcasting apparatus 150 by using the communication circuit 661.
In practice, the communication circuit 661 can be implemented by various wired transmission circuits, wireless transmission circuits, or a hybrid circuit combining the two communication mechanisms. The input circuit 663 can be implemented by a keyboard, a mouse, a remote controller, a touch screen, a touch pad, a button, a resistive touch circuit, a capacitive touch circuit, a gyroscope, a voice-controlled input device, a gesture-sensing device, a circuit using various other command generation techniques, or a combination thereof. The processing circuit 665 may be implemented using a single processor module, a combination of multiple processor modules, a single computer system, a combination of multiple computer systems, a single server, or a combination of multiple servers, with suitable computing and instruction processing capabilities.
In practical applications, the different functional blocks of the main control device 660 can be implemented by different circuits, and can be integrated into a mobile communication device (e.g., a mobile phone), a wearable device, a tablet computer, a notebook computer, a desktop computer, an onboard communication system, a satellite communication device, an intelligent audio box, or a video conference system.
Similar to the embodiment of fig. 3, the audio source device 370 in fig. 6 can also receive the sound emitted by the user to generate a corresponding audio signal AS, and can transmit the audio signal AS to the audio broadcasting device 150 by using various wired or wireless transmission methods. The audio broadcasting device 150 in fig. 6 can also convert the audio signal AS from the audio source device 370 into predetermined audio data to be broadcasted. In other words, the content of the predetermined audio data broadcasted by the audio broadcasting device 150 in fig. 6 also originates from the audio source device 370.
However, the difference with the bluetooth audio broadcasting system 200 in fig. 3 is that in the embodiment of fig. 6, the volume-adjusting signal VAS is generated by the master device 660 and transmitted to the audio broadcasting device 150, instead of being generated by the audio source device 370.
In operation, the bluetooth audio broadcasting system 200 in the embodiment of fig. 6 can also broadcast audio in the manner described above with reference to fig. 4. In addition, during the audio broadcasting process of the audio broadcasting device 150 (i.e., during the process of the audio broadcasting device 150 repeating the process 222 and the process 224 of fig. 4), if the user of the master device 660 wants to adjust the volume levels of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140, the user can perform a specific operation or issue a specific command to the input circuit 663 of the master device 660, so that the processing circuit 665 generates a volume adjustment signal VAS and transmits the volume adjustment signal VAS to the audio broadcasting device 150 by using the communication circuit 661.
In this case, the audio broadcasting device 150 in fig. 6 can perform the aforementioned processes 502 and 504 in fig. 5 according to the volume adjusting signal VAS generated by the host device 660 to instruct the bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140) in the bluetooth audio broadcasting system 200 to synchronously adjust the volume.
For example, during the process of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 playing the audio data broadcasted by the audio broadcasting device 150, the master device 660 may instruct the audio broadcasting device 150 to broadcast a volume adjustment instruction to the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 according to the operation or instruction of the user, so as to synchronously adjust the volume of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140.
In other words, the bluetooth audio broadcasting system 200 of fig. 6 also allows the user to synchronously adjust the volume of all bluetooth member devices in the bluetooth audio broadcasting system 200.
The above description regarding the embodiments and connections of the related circuits and devices in fig. 3 also applies to the bluetooth audio broadcasting system 200 in fig. 6. The above description of the operations of fig. 4 and fig. 5 also applies to the bluetooth audio broadcasting system 200 of fig. 6. For the sake of brevity, the description is not repeated here.
Referring to fig. 7, a simplified functional block diagram of a bluetooth audio broadcasting system 200 according to a fourth embodiment of the invention is shown. Similar to the bluetooth audio broadcasting system 200 of fig. 6, the bluetooth audio broadcasting system 200 of fig. 7 also includes an audio broadcasting device 150, a plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140), and a master device 660, but the bluetooth audio broadcasting system 200 of fig. 7 omits the audio source device 370.
In the embodiment of fig. 7, the predetermined audio data to be broadcast by the audio broadcasting device 150 may be audio data stored in the audio broadcasting device 150 in advance, or may also be audio data generated by the audio broadcasting device 150 according to the sound of the surrounding environment (e.g., the sound of the user).
As with the previous embodiment of fig. 6, the volume adjusting signal VAS in the embodiment of fig. 7 is also generated by the host 660 and transmitted to the audio broadcasting device 150.
In operation, the bluetooth audio broadcasting system 200 in the embodiment of fig. 7 can also broadcast audio in the manner described above with reference to fig. 4. In addition, during the audio broadcasting process of the audio broadcasting device 150 (i.e., during the process of the audio broadcasting device 150 repeating the process 222 and the process 224 of fig. 4), if the user of the master device 660 wants to adjust the volume levels of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140, the user can perform a specific operation or issue a specific command to the input circuit 663 of the master device 660, so that the processing circuit 665 generates a volume adjustment signal VAS and transmits the volume adjustment signal VAS to the audio broadcasting device 150 by using the communication circuit 661.
Similarly, the audio broadcasting device 150 in fig. 7 can perform the aforementioned processes 502 and 504 in fig. 5 according to the volume adjusting signal VAS generated by the host device 660 to instruct the bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140) in the bluetooth audio broadcasting system 200 to synchronously adjust the volume.
For example, in the process of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 playing the audio data broadcasted by the audio broadcasting device 150, the master device 660 may instruct the audio broadcasting device 150 to broadcast a volume adjustment instruction to the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 according to the operation or the instruction of the user, so as to synchronously adjust the volume of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140.
In other words, the bluetooth audio broadcasting system 200 of fig. 7 also allows the user to synchronously adjust the volume of all bluetooth member devices in the bluetooth audio broadcasting system 200.
The foregoing description regarding the embodiments and connections of the related circuits and devices in fig. 3 or fig. 6 also applies to the bluetooth audio broadcasting system 200 in fig. 7. The above description regarding the operation of fig. 4 and 5 is also applicable to the bluetooth audio broadcasting system 200 of fig. 7. For the sake of brevity, the description is not repeated here.
As can be seen from the above descriptions of fig. 3 to fig. 7, before the multi-member bluetooth device in the bluetooth audio broadcasting system 200 starts to play the predetermined audio data transmitted from the audio broadcasting device 150, the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume of the first audio playing circuit 113 and the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume according to the predetermined volume indication transmitted from the audio broadcasting device 150.
Therefore, when the first bluetooth member device 110 starts to play the predetermined audio data from the audio broadcasting device 150 by using the first audio playback circuit 113, the volume level emitted by the first audio playback circuit 113 is close to or equal to the predetermined volume level. Similarly, when the second bluetooth member device 120 starts to play the predetermined audio data from the audio broadcasting device 150 by using the second audio playing circuit 123, the volume level emitted by the second audio playing circuit 123 is close to or equal to the predetermined volume level.
In this way, the volume generated when the first audio playback circuit 113 and the second audio playback circuit 123 start to synchronously play the predetermined audio data can make the user feel comfortable without causing discomfort or discomfort to the user.
In addition, since the volume levels of the first audio playback circuit 113 and the second audio playback circuit 123 when the first audio playback circuit and the second audio playback circuit start to synchronously play the predetermined audio data are preset to be close to or equal to the predetermined volume levels, even if the audio broadcasting apparatus 150 starts to perform the audio broadcasting without psychological expectation, the user is prevented from being scared due to the excessive volume of the audio broadcasting.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 200 adjust the volume of the corresponding audio playing circuit (not shown) to be close to or equal to the predetermined volume according to the predetermined volume indication from the audio broadcasting device 150 before starting to play the predetermined audio data from the audio broadcasting device 150. Therefore, the volume level emitted by the other bluetooth member devices in the bluetooth audio broadcasting system 200 when they start to synchronously play the predetermined audio data can also be comfortable for the user without causing discomfort or discomfort to the user.
In addition, during the process of the multiple bluetooth devices in the bluetooth audio broadcasting system 200 playing the audio data broadcasted by the audio broadcasting device 150, the audio source device 370 or the master device 660 may further instruct the audio broadcasting device 150 to broadcast a volume adjustment instruction to the respective bluetooth member devices according to the operation or instruction of the user, so as to synchronously adjust the volume of the respective bluetooth member devices. In other words, the bluetooth audio broadcasting system 200 allows the user to adjust the volume of different bluetooth member devices in the bluetooth audio broadcasting system 200 synchronously.
Furthermore, the bluetooth audio broadcasting system 200 employs BLE audio technology for audio broadcasting, and the audio broadcasting apparatus 150 may encode predetermined audio data using a low complexity communication codec (LC 3). Therefore, compared to the conventional audio broadcasting method, the audio broadcasting method adopted by the bluetooth audio broadcasting system 200 can not only reduce the power consumption of the multi-member bluetooth devices, thereby prolonging the service time of the multi-member bluetooth devices, but also effectively improve the overall audio quality of the audio broadcasting.
Referring to fig. 8, a simplified functional block diagram of a bluetooth audio broadcasting system 300 according to a fifth embodiment of the present invention is shown. Similar to the bluetooth audio broadcasting system 200 of fig. 7, the bluetooth audio broadcasting system 300 of fig. 8 also includes an audio broadcasting device 150, a plurality of bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140), and a master device 660.
Unlike the embodiment of fig. 7, some or all of the bluetooth member devices in the bluetooth audio broadcasting system 300 further include a triggering circuit and a wireless communication circuit. For example, in the embodiment of fig. 8, in addition to the first bluetooth communication circuit 111, the first audio processing circuit 112, the first audio playing circuit 113, and the first control circuit 114, the first bluetooth member device 110 further includes a first wireless communication circuit 815 and a first trigger circuit 816. Similarly, in addition to the second bluetooth communication circuit 121, the second audio processing circuit 122, the second audio playing circuit 123 and the second control circuit 124, the second bluetooth member device 120 further includes a second wireless communication circuit 825 and a second triggering circuit 826.
In the first bluetooth member device 110, the first wireless communication circuit 815 is coupled to the first control circuit 114 and configured to communicate various data and/or commands with the host apparatus 660 by using various Radio Access Technologies (RATs) other than bluetooth communication under the control of the first control circuit 114. The first trigger circuit 816 is coupled to the first control circuit 114 and configured to generate a corresponding user trigger signal according to a simple operation of a user. The first control circuit 114 generates a volume adjustment request VAR when the first trigger circuit 816 generates the user trigger signal, and transmits the volume adjustment request VAR to the host 660 via the first wireless communication circuit 815.
The aforementioned radio access technology may be various infrared signal transmission technologies, Near Field Communication (NFC) technologies, 2nd Generation (2G) mobile communication technologies, various third Generation (3G) mobile communication technologies, various fourth Generation (4G) mobile communication technologies, various fifth Generation (5G) mobile communication technologies, various IEEE 802.11 series standard wireless network communication technologies, various Internet of things (IoT) communication technologies, various narrowband Internet of things (NB-IoT) communication technologies, various Vehicle-to-Vehicle (Vehicle-to-Vehicle) communication technologies, various Vehicle-to-Vehicle (V2X) communication technologies, various satellite communication technologies, various wireless communication technologies released by other standards-making organizations, and the like.
In the second bluetooth member device 120, the second wireless communication circuit 825 is coupled to the second control circuit 124 and configured to communicate various data and/or commands with the host device 660 under the control of the second control circuit 124 by using various Radio Access Technologies (RATs) other than bluetooth communication. The second trigger circuit 826 is coupled to the second control circuit 124 and configured to generate a corresponding user trigger signal according to a simple operation of a user. The second control circuit 124 generates a volume adjustment request VAR when the second trigger circuit 826 generates the user trigger signal, and transmits the volume adjustment request VAR to the host device 660 via the second wireless communication circuit 825.
In practice, the first wireless communication circuit 815 and the second wireless communication circuit 825 can be implemented by various suitable circuits or chips supporting one or more of the above wireless access technologies, such as an infrared signal transmission circuit, a near field communication circuit, a Network Interface Card (NIC), a wireless transmission (Wi-Fi) circuit, a mobile communication circuit, a satellite communication circuit, an internet of things communication circuit, and the like. The first wireless communication circuit 815 may be integrated with other functional blocks in the first bluetooth member device 110, such as the first bluetooth communication circuit 111. Likewise, the second wireless communication circuit 825 may be integrated with other functional blocks in the second bluetooth member device 120 (e.g., the second bluetooth communication circuit 121).
The first trigger circuit 816 and the second trigger circuit 826 can be implemented by various devices that can generate corresponding user trigger signals according to simple operations of a user, such as various touch control circuits, buttons, switches, remote controllers, touch screens, voice control devices, gesture sensing devices, gyroscopes, circuits using other trigger signal generation technologies, or combinations thereof. The first trigger circuit 816 may be disposed outside the first bluetooth member device 110 or may be integrated with other functional blocks of the first bluetooth member device 110. Similarly, the second trigger circuit 826 may be disposed outside the second bluetooth member device 120, or may be integrated with other functional blocks of the second bluetooth member device 120.
The other bluetooth member devices in the bluetooth audio broadcasting system 300 may be configured with corresponding trigger circuits and wireless communication circuits according to the aforementioned configurations of the first bluetooth member device 110 or the second bluetooth member device 120.
In the embodiment of fig. 8, a plurality of bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140) in the bluetooth audio broadcasting system 300 may collectively form a multi-member bluetooth device, e.g., a set of multi-channel bluetooth speakers.
In operation, the bluetooth audio broadcasting system 300 can also broadcast audio to the aforementioned multi-member bluetooth devices in the manner described above with reference to fig. 4.
In addition, during the audio broadcasting process of the audio broadcasting device 150 (i.e., during the audio broadcasting device 150 repeatedly performs the processes 222 and 224 of fig. 4), if the aforementioned user of the multi-member bluetooth device wants to adjust the volume of all bluetooth member devices, the user can perform a specific operation on the first trigger circuit 816 of the first bluetooth member device 110, so that the first trigger circuit 816 generates and transmits a user trigger signal to the first control circuit 114. Alternatively, the user may perform a specific operation on the second trigger circuit 826 of the second bluetooth member device 120, so that the second trigger circuit 826 generates and transmits a user trigger signal to the second control circuit 124.
If the user performs a specific operation on the first trigger circuit 816, the first control circuit 114 may generate a volume adjustment request VAR according to the user trigger signal generated by the first trigger circuit 816, and transmit the volume adjustment request VAR to the communication circuit 661 of the host apparatus 660 via the first wireless communication circuit 815. Similarly, if the user performs a specific operation on the second trigger circuit 826, the second control circuit 124 can generate a volume adjustment request VAR according to the user trigger signal generated by the second trigger circuit 826, and transmit the volume adjustment request VAR to the communication circuit 661 of the host device 660 via the second wireless communication circuit 825.
In the embodiment of fig. 8, when the communication circuit 661 of the master device 660 receives the volume adjustment request VAR from the first bluetooth member device 110 or the second bluetooth member device 120, the processing circuit 665 generates a volume adjustment signal VAS and transmits the volume adjustment signal VAS to the audio broadcasting device 150 via the communication circuit 661.
Similarly, the audio broadcasting device 150 in fig. 8 can perform the aforementioned processes 502 and 504 in fig. 5 according to the volume adjusting signal VAS generated by the host device 660 to instruct the bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140) in the bluetooth audio broadcasting system 300 to synchronously adjust the volume.
For example, in the process of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 playing the audio data broadcasted by the audio broadcasting device 150, the master device 660 may instruct the audio broadcasting device 150 to broadcast a volume adjustment indication to the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 according to a volume adjustment request VAR transmitted by any one of the bluetooth member devices (e.g., the aforementioned first bluetooth member device 110 or the second bluetooth member device 120) so as to synchronously adjust the volume of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140.
In other words, the bluetooth audio broadcasting system 300 of fig. 8 also allows the user to synchronously adjust the volume of all bluetooth member devices in the bluetooth audio broadcasting system 300.
The above description of the related circuits and devices in fig. 3, fig. 6, or fig. 7 and the connection method are also applicable to the bluetooth audio broadcasting system 300 in fig. 8. The above description regarding the operation of fig. 4 and 5 also applies to the bluetooth audio broadcasting system 300 of fig. 8. For the sake of brevity, the description is not repeated here.
As can be seen from the foregoing description, in the bluetooth audio broadcasting system 300, the first bluetooth member device 110 can utilize the first wireless communication circuit 815 to transmit the volume adjustment request VAR to the master device 660, and the second bluetooth member device 120 can utilize the second wireless communication circuit 825 to transmit the volume adjustment request VAR to the master device 660. However, this is only an exemplary embodiment and does not limit the practical implementation of the present invention. In fact, the first bluetooth member device 110 or the second bluetooth member device 120 may instead transmit the volume adjustment request VAR to the master device 660 in other manners.
For example, in another embodiment, the first bluetooth member device 110 may transmit the volume adjustment request VAR to the master device 660 using the first bluetooth communication circuit 111, and the second bluetooth member device 120 may transmit the volume adjustment request VAR to the master device 660 using the first bluetooth communication circuit 111. In this case, the first wireless communication circuit 815 and/or the second wireless communication circuit 825 may be omitted.
Additionally, in some embodiments, the second trigger circuit 826 in the second bluetooth member device 120 of fig. 8 may also be omitted.
Referring to fig. 9, a simplified functional block diagram of a bluetooth audio broadcasting system 300 according to a sixth embodiment of the invention is shown. Similar to the bluetooth audio broadcasting system 300 of fig. 8, the bluetooth audio broadcasting system 300 of fig. 9 also includes the audio broadcasting device 150 and a plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140), but the master device 660 is omitted from the bluetooth audio broadcasting system 300 of fig. 9.
In addition, slightly different from the embodiment of fig. 8, some or all of the bluetooth member devices in the bluetooth audio broadcasting system 300 of fig. 9 further include a trigger circuit, but the aforementioned wireless communication circuit is omitted. For example, in the embodiment of fig. 9, the first bluetooth member device 110 includes the aforementioned first bluetooth communication circuit 111, the first audio processing circuit 112, the first audio playback circuit 113, the first control circuit 114, and the first trigger circuit 816, but the first wireless communication circuit 815 is omitted. Similarly, the second bluetooth member device 120 comprises the aforementioned second bluetooth communication circuit 121, second audio processing circuit 122, second audio playing circuit 123, second control circuit 124 and second triggering circuit 826, but omits the second wireless communication circuit 825.
The other bluetooth member devices in the bluetooth audio broadcasting system 300 of fig. 9 may be configured with corresponding trigger circuits according to the above-described configurations of the first bluetooth member device 110 or the second bluetooth member device 120.
In the embodiment of fig. 9, a plurality of bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140) in the bluetooth audio broadcasting system 300 may collectively form a multi-member bluetooth device, e.g., a set of multi-channel bluetooth speakers.
In operation, the bluetooth audio broadcasting system 300 of fig. 9 can also broadcast audio to the aforementioned multi-member bluetooth devices in the manner of fig. 4.
In addition, during the audio broadcasting process of the audio broadcasting device 150 (i.e., during the audio broadcasting device 150 repeatedly performs the processes 222 and 224 of fig. 4), if the aforementioned user of the multi-member bluetooth device wants to adjust the volume of all bluetooth member devices, the user can perform a specific operation on the first trigger circuit 816 of the first bluetooth member device 110, so that the first trigger circuit 816 generates and transmits a user trigger signal to the first control circuit 114. Alternatively, the user can also perform a specific operation on the second trigger circuit 826 of the second bluetooth member device 120 to cause the second trigger circuit 826 to generate and transmit a user trigger signal to the second control circuit 124.
In the embodiment of fig. 9, if the user performs a specific operation on the first trigger circuit 816, the first control circuit 114 may generate a volume adjustment signal VAS according to the user trigger signal generated by the first trigger circuit 816, and transmit the volume adjustment signal VAS to the audio broadcasting device 150 by using the first bluetooth communication circuit 111. Similarly, if the user performs a specific operation on the second trigger circuit 826, the second control circuit 124 may generate a volume adjustment signal VAS according to the user trigger signal generated by the second trigger circuit 826, and transmit the volume adjustment signal VAS to the audio broadcasting device 150 by using the second bluetooth communication circuit 121.
When the audio broadcasting device 150 in fig. 9 receives the volume-adjusting signal VAS transmitted from the first bluetooth member device 110 or the second bluetooth member device 120, the audio broadcasting device 150 can perform the aforementioned processes 502 and 504 in fig. 5 to instruct a plurality of bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 300 to synchronously adjust the volume.
For example, during the process of playing the audio data broadcasted by the audio broadcasting device 150 by the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140, the audio broadcasting device 150 may generate and broadcast a volume adjustment indication to the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140 according to the volume adjustment signal VAS transmitted by any bluetooth member device (e.g., the aforementioned first bluetooth member device 110 or the second bluetooth member device 120) to synchronously adjust the volume of the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140.
In other words, the bluetooth audio broadcasting system 300 of fig. 9 also allows the user to synchronously adjust the volume of all bluetooth member devices in the bluetooth audio broadcasting system 300.
The foregoing descriptions regarding the embodiments and connections of the related circuits and devices in fig. 3, fig. 6, fig. 7, or fig. 8 are also applicable to the bluetooth audio broadcasting system 300 in fig. 9. The above description regarding the operation of fig. 4 and 5 also applies to the bluetooth audio broadcasting system 300 of fig. 9. For the sake of brevity, the description is not repeated here.
In some embodiments, the second trigger circuit 826 in the second bluetooth member device 120 of fig. 9 may also be omitted.
As can be seen from the above descriptions of fig. 4, fig. 5, fig. 8, and fig. 9, before the multi-member bluetooth device in the bluetooth audio broadcasting system 300 starts to play the predetermined audio data transmitted from the audio broadcasting device 150, the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume of the first audio playing circuit 113 and the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume according to the predetermined volume indication transmitted from the audio broadcasting device 150.
Therefore, when the first bluetooth member device 110 starts to play the predetermined audio data from the audio broadcasting device 150 by using the first audio playback circuit 113, the volume level emitted by the first audio playback circuit 113 is close to or equal to the predetermined volume level. Similarly, when the second bluetooth member device 120 starts to play the predetermined audio data from the audio broadcasting device 150 by using the second audio playing circuit 123, the volume level emitted by the second audio playing circuit 123 is close to or equal to the predetermined volume level.
In this way, the volume generated when the first audio playback circuit 113 and the second audio playback circuit 123 start to synchronously play the predetermined audio data can make the user feel comfortable without causing discomfort or discomfort to the user.
In addition, since the volume levels of the first audio playback circuit 113 and the second audio playback circuit 123 when the first audio playback circuit and the second audio playback circuit start to synchronously play the predetermined audio data are preset to be close to or equal to the predetermined volume levels, even if the audio broadcasting apparatus 150 starts to perform the audio broadcasting without psychological expectation, the user is prevented from being scared due to the excessive volume of the audio broadcasting.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 300 adjust the volume of the corresponding audio playing circuit (not shown) to be close to or equal to the predetermined volume according to the predetermined volume indication from the audio broadcasting device 150 before starting to play the predetermined audio data from the audio broadcasting device 150. Therefore, the volume level emitted by the other bluetooth member devices in the bluetooth audio broadcasting system 300 when they start to synchronously play the predetermined audio data can also be comfortable for the user without causing discomfort or discomfort to the user.
In addition, during the process of playing the audio data broadcasted by the audio broadcasting device 150 by the multi-member bluetooth devices in the bluetooth audio broadcasting system 300, the user can also simply operate the trigger circuit of one of the bluetooth member devices, so that the bluetooth member device directly instructs (or indirectly instructs through the master control device 660) the audio broadcasting device 150 to broadcast a volume adjustment instruction to the respective bluetooth member devices, so as to synchronously adjust the volume of the respective bluetooth member devices. In other words, the aforementioned bluetooth audio broadcasting system 300 allows the user to adjust the volume of different bluetooth member devices in the bluetooth audio broadcasting system 300 synchronously.
Furthermore, the bluetooth audio broadcasting system 300 employs BLE audio technology for audio broadcasting, and the audio broadcasting apparatus 150 may employ a low complexity communication codec (LC3) to encode predetermined audio data. Therefore, compared to the conventional audio broadcasting method, the audio broadcasting method adopted by the bluetooth audio broadcasting system 300 can not only reduce the power consumption of the multi-member bluetooth devices, thereby prolonging the service time of the multi-member bluetooth devices, but also effectively improve the overall audio quality of the audio broadcasting.
Referring to fig. 10, a simplified functional block diagram of a bluetooth audio broadcasting system 400 according to a seventh embodiment of the invention is shown.
In the embodiment of fig. 10, the bluetooth audio broadcasting system 400 includes an audio broadcasting device 150, a plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140), and one or more master devices. For convenience of illustration, only two exemplary masters, namely a master 1060 and a master 1070, are shown in the embodiment of fig. 10.
In the bluetooth audio broadcasting system 400, the host 1060 is configured to instruct a plurality of bluetooth member devices in the bluetooth audio broadcasting system 400 to synchronously adjust the volume according to the operation or instruction of the user.
As shown in fig. 10, the master control device 1060 includes a communication circuit 1061, an input circuit 1063, and a processing circuit 1065. The communication circuit 1061 is configured to communicate various data and commands with a plurality of bluetooth member devices in the bluetooth audio broadcasting system 400 using various wired or wireless transmissions. The input circuit 1063 is configured to allow a user of the main control device 1060 to perform various operations on the main control device 1060, such as inputting instructions, setting a volume adjustment direction, setting a volume adjustment amount, and the like. The processing circuit 1065 is coupled to the communication circuit 1061 and the input circuit 1063, and configured to generate a volume adjustment indication according to a user's operation of the input circuit 1063, and transmit the volume adjustment indication to a plurality of bluetooth member devices in the bluetooth audio broadcasting system 400 by using the communication circuit 1061.
In addition, in the embodiment of fig. 10, the first bluetooth member device 110 includes the aforementioned first bluetooth communication circuit 111, the first audio processing circuit 112, the first audio playing circuit 113, the first control circuit 114, and the first wireless communication circuit 815. Similarly, the second bluetooth member device 120 includes the aforementioned second bluetooth communication circuit 121, the second audio processing circuit 122, the second audio playing circuit 123, the second control circuit 124, and the second wireless communication circuit 825.
Similar to the embodiment of fig. 8, the first wireless communication circuit 815 of fig. 10 is coupled to the first control circuit 114 and configured to communicate various data and/or commands with the communication circuit 1061 of the host device 1060 by using various Radio Access Technologies (RATs) other than bluetooth communication under the control of the first control circuit 114. Similarly, the second wireless communication circuit 825 is coupled to the second control circuit 124 and configured to communicate various data and/or commands with the communication circuit 1061 of the host device 1060 under the control of the second control circuit 124 by using various wireless access technologies other than bluetooth communication.
The operation of the bluetooth audio broadcasting system 400 will be further described with reference to fig. 11. Fig. 11 is a simplified flowchart of a method for audio broadcasting using BLE audio technology according to a third embodiment of the present invention.
When the user wants to receive the audio broadcast by using the first bluetooth member device 110 and the second bluetooth member device 120 in the bluetooth audio broadcasting system 400, the first bluetooth member device 110 and the second bluetooth member device 120 may perform a process 1102 in fig. 11. In this embodiment, the first bluetooth member device 110 operates in a process 1102 substantially the same as the process 202 of fig. 2, and the second bluetooth member device 120 operates in the process 1102 substantially the same as the process 204 of fig. 2.
As shown in fig. 11, when the audio broadcasting apparatus 150 needs to perform audio broadcasting, the processes 206 to 210 in fig. 11 may be performed. The operations of the audio broadcasting apparatus 150 in the processes 206 to 210 of fig. 11 are the same as the corresponding processes of fig. 2. That is, the audio broadcasting device 150 may insert a predetermined volume indication corresponding to a predetermined volume level into one or more predetermined data items. In addition, the audio broadcasting device 150 can transmit the one or more predetermined data items in the predetermined transmission mode, so that the plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 can receive the one or more predetermined data items.
The first bluetooth member device 110 and the second bluetooth member device 120 may then proceed to flow 1112 and flow 1114 in fig. 11. In the present embodiment, the operation of the first bluetooth member device 110 in the process 1112 and the process 1114 is substantially the same as the process 212 and the process 214 in fig. 2, respectively, and the operation of the second bluetooth member device 120 in the process 1112 and the process 1114 is substantially the same as the process 212 and the process 218 in fig. 2, respectively.
Then, the first bluetooth member device 110 and the second bluetooth member device 120 may proceed to the process 1116 in fig. 11 to set the gain value of the corresponding audio playback circuit according to the predetermined volume indication transmitted from the audio broadcasting device 150. In this embodiment, the operation of the first bluetooth member device 110 in the process 1116 is substantially the same as the process 216 in fig. 2, and the operation of the second bluetooth member device 120 in the process 1116 is substantially the same as the process 220 in fig. 2.
For example, the first control circuit 114 may control the first audio processing circuit 112 to set the gain value of the first audio playback circuit 113 according to the predetermined volume indication in the process 1116, so as to adjust the volume of the first audio playback circuit 113 to be close to or equal to the predetermined volume. Similarly, the second control circuit 124 may control the second audio processing circuit 122 to set the gain value of the second audio playing circuit 123 according to the predetermined volume indication in the process 1116, so as to preset the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume.
In other words, in the embodiment, before the first bluetooth member device 110 and the second bluetooth member device 120 play the audio data transmitted from the audio broadcasting device 150, the volume levels of the first audio playing circuit 113 and the second audio playing circuit 123 are adjusted to be close to or equal to the predetermined volume levels according to the predetermined volume indications transmitted from the audio broadcasting device 150.
As shown in fig. 11, after the flow 210, the audio broadcasting apparatus 150 further performs a flow 222 and a flow 224. On the other hand, the first bluetooth member device 110 and the second bluetooth member device 120 may perform the processes 1126, 1128, and 1130 in fig. 11. In the present embodiment, the operation manners of the first bluetooth member device 110 in the process 1126, the process 1128 and the process 1130 are substantially the same as those of the process 226, the process 228 and the process 230 in fig. 2, respectively, and the operation manners of the second bluetooth member device 120 in the process 1126, the process 1128 and the process 1130 are substantially the same as those of the process 226, the process 232 and the process 234 in fig. 2, respectively.
The audio broadcasting device 150 can repeat the processes 222 and 224 in fig. 11 to broadcast the subsequent predetermined audio data. On the other hand, the first bluetooth member device 110 and the second bluetooth member device 120 may repeat the processes 1126, 1128, and 1130 to receive and play the subsequent predetermined audio data.
As can be seen from the foregoing description, the audio broadcasting device 150 in fig. 10 may also broadcast the predetermined audio data by using BLE audio technology specified by the bluetooth core specification version 5.2 or later. In operation, the audio broadcasting device 150 may broadcast the bluetooth low energy audio packets containing predetermined audio data to a plurality of bluetooth member devices (e.g., the first bluetooth member device 110, the second bluetooth member device 120, the third bluetooth member device 130, and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 via the BIS logical transmission channel.
During the audio broadcasting process of the audio broadcasting apparatus 150 in fig. 10 (i.e., during the audio broadcasting apparatus 150 repeatedly performs the processes 222 and 224 in fig. 11), if the user of the host 1060 wants to adjust the volume levels of the plurality of bluetooth member devices (e.g., the first bluetooth member device 110 and the second bluetooth member device 120), the user can perform a specific operation on the input circuit 1063 of the host 1060, such as inputting a command, setting a volume adjustment direction, or setting a volume adjustment amount. In this case, the processing circuit 1065 may perform the flow 1132 in fig. 11.
In the process 1132, the processing circuit 1065 may generate a volume adjustment indication indicating a volume adjustment direction (e.g., up or down) according to the operation of the input circuit 1063 by the user, and may transmit the volume adjustment indication to the first wireless communication circuit 815 of the first bluetooth member device 110 and the second wireless communication circuit 825 of the second bluetooth member device 120 by using various Radio Access Technologies (RATs) other than bluetooth communication by using the communication circuit 1061.
In the process 1134, the first wireless communication circuit 815 and the second wireless communication circuit 825 receive the volume adjustment indication from the host 1060.
Then, the first bluetooth member device 110 and the second bluetooth member device 120 may proceed to process 1136 to adjust the gain value of the corresponding audio playback circuit according to the volume adjustment instruction transmitted from the main control device 1060. In this embodiment, the operation of the first bluetooth member device 110 in the process 1136 is substantially the same as the process 510 in fig. 5, and the operation of the second bluetooth member device 120 in the process 1136 is substantially the same as the process 514 in fig. 5.
For example, the first control circuit 114 can control the first audio processing circuit 112 to adjust the gain value of the first audio playing circuit 113 according to the volume adjustment indication sent by the main control device 1060 in the process 1136, so as to adjust the volume of the first audio playing circuit 113. Similarly, in the process 1136, the second control circuit 124 controls the second audio processing circuit 122 to adjust the gain of the second audio playing circuit 123 according to the volume adjustment indication sent from the main control device 1060, so as to adjust the volume of the second audio playing circuit 123.
Since the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume according to the volume adjustment indication from the host 1060, when the first audio processing circuit 112 adjusts the volume of the first audio playing circuit 113, the second audio processing circuit 122 also synchronously adjusts the volume of the second audio playing circuit 123.
In other words, during the process of the first bluetooth member device 110 and the second bluetooth member device 120 playing the audio data broadcasted by the audio broadcasting device 150, the main control device 1060 can generate and transmit a volume adjustment instruction to the first bluetooth member device 110 and the second bluetooth member device 120 according to the operation or the instruction of the user, so as to synchronously adjust the volume of the first bluetooth member device 110 and the second bluetooth member device 120.
As can be seen from the foregoing description, the Bluetooth Audio broadcasting System 400 allows the user to synchronously adjust the volume of the associated Bluetooth member devices in the Bluetooth Audio broadcasting System 400.
In the bluetooth audio broadcasting system 400, the communication circuit 1061 of the host 1060 employs various Radio Access Technologies (RATs) other than bluetooth communication to transmit the volume adjustment indication to the first wireless communication circuit 815 of the first bluetooth member device 110 and the second wireless communication circuit 825 of the second bluetooth member device 120. However, this is only an exemplary embodiment and does not limit the practical implementation of the present invention. In practice, the communication circuit 1061 of the master device 1060 may instead transmit the volume adjustment indication to the first bluetooth member device 110 and the second bluetooth member device 120 using other transmission mechanisms.
For example, in another embodiment, the communication circuit 1061 of the master device 1060 may instead use bluetooth communication technology to transmit the volume adjustment indication to the first bluetooth communication circuit 111 of the first bluetooth member device 110 and the second bluetooth communication circuit 121 of the second bluetooth member device 120. In this case, the first bluetooth member device 110 can use the first bluetooth communication circuit 111 to receive the volume adjustment indication from the host 1060, and the second bluetooth member device 120 can use the first bluetooth communication circuit 111 to receive the volume adjustment indication from the host 1060. As such, the first wireless communication circuit 815 and/or the second wireless communication circuit 825 shown in fig. 10 can be omitted.
In some embodiments in which the communication circuit 1061 of the host 1060 utilizes bluetooth communication technology instead to transmit the volume adjustment indicator to the first bluetooth member device 110 and the second bluetooth member device 120, the processing circuit 1065 of the host 1060 may insert the volume adjustment indicator into one or more target data items in accordance with the operation of the audio broadcasting device 150 in the process 502 of fig. 5.
For example, in some embodiments where the targeted data items are various bluetooth advertisement packets, the processing circuit 1065 may insert the volume adjustment indicators into a single or multiple specific fields of a single bluetooth advertisement packet, or into specific fields of multiple bluetooth advertisement packets.
For another example, in some embodiments where the target data items are various BIS protocol data units or BIG protocol data units, the processing circuit 1065 may insert the volume adjustment indication into a single or multiple specific fields of a single BIS protocol data unit or BIG protocol data unit, or insert the volume adjustment indication into multiple specific fields of multiple BIS protocol data units or BIG protocol data units. As mentioned above, the specific field may be an Event count (Event Counter) field, a Sub-Event count (Sub-Event Counter) field, or a load count (Payload Counter) field in the BIS protocol data unit or the BIG protocol data unit.
Then, the processing circuit 1065 controls the communication circuit 1061 to operate in a target transmission mode to transmit the one or more target data items to the first bluetooth member device 110 and the second bluetooth member device 120, according to the operation of the audio broadcasting device 150 in the process 504 of fig. 5. The communication circuit 1061 communicates the one or more target data items to the first bluetooth member device 110 and the second bluetooth member device 120 in the target delivery mode in the same manner as the process 504 and 506 of fig. 5. For the sake of brevity, the description is not repeated here.
In practical applications, the master device 1060 can utilize the volume adjustment indication to synchronously adjust the volume of other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 according to the aforementioned manner of adjusting the volume of the first bluetooth member device 110 or the second bluetooth member device 120. However, this is only an exemplary embodiment and does not limit the practical implementation of the present invention.
In fact, the volume levels of other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 may be controlled by another master device (e.g., the master device 1070). In this case, the third bluetooth member device 130 and the fourth bluetooth member device 140 synchronously adjust the volume level when playing the predetermined audio data according to the volume adjustment indication generated by the master control device 1070.
Referring to fig. 12, a simplified functional block diagram of a bluetooth audio broadcasting system 300 according to an eighth embodiment of the invention is shown. Similar to the bluetooth audio broadcasting system 400 of fig. 10, the bluetooth audio broadcasting system 400 of fig. 12 also includes an audio broadcasting device 150, a plurality of bluetooth member devices (e.g., the aforementioned first bluetooth member device 110, second bluetooth member device 120, third bluetooth member device 130, and fourth bluetooth member device 140), a master device 1060, and a master device 1070.
In contrast to the embodiment of fig. 10, some or all of the bluetooth member devices in the bluetooth audio broadcasting system 400 of fig. 12 further include a trigger circuit. For example, in the embodiment of fig. 12, in addition to the first bluetooth communication circuit 111, the first audio processing circuit 112, the first audio playing circuit 113, the first control circuit 114, and the first wireless communication circuit 815, the first bluetooth member device 110 further includes a first trigger circuit 816. Similarly, in addition to the aforementioned second bluetooth communication circuit 121, the second audio processing circuit 122, the second audio playing circuit 123, the second control circuit 124 and the second wireless communication circuit 825, the second bluetooth member device 120 further includes a second triggering circuit 826.
In the first bluetooth member device 110, the first trigger circuit 816 is coupled to the first control circuit 114 and configured to generate a corresponding user trigger signal according to a simple operation of a user. The first control circuit 114 can generate a volume adjustment request VAR when the first trigger circuit 816 generates the user trigger signal, and transmit the volume adjustment request VAR to the host 1060 by using the first wireless communication circuit 815.
In the second bluetooth member device 120, the second trigger circuit 826 is coupled to the second control circuit 124 and configured to generate a corresponding user trigger signal according to a simple operation of a user. The second control circuit 124 generates a volume adjustment request VAR when the second trigger circuit 826 generates the user trigger signal, and transmits the volume adjustment request VAR to the host 1060 through the second wireless communication circuit 825.
As mentioned above, the first trigger circuit 816 and the second trigger circuit 826 can be implemented by various devices that can generate corresponding user trigger signals according to simple operations of a user, such as various touch control circuits, buttons, switches, remote controllers, touch screens, voice control devices, gesture sensing devices, gyroscopes, circuits using other trigger signal generation technologies, or combinations of the above-mentioned devices. The first trigger circuit 816 may be disposed outside the first bluetooth member device 110 or may be integrated with other functional blocks of the first bluetooth member device 110. Similarly, the second triggering circuit 826 can be disposed outside the second bluetooth member device 120 and can be integrated with other functional blocks of the second bluetooth member device 120.
The other bluetooth member devices in the bluetooth audio broadcasting system 400 of fig. 12 may be configured with corresponding trigger circuits according to the above-described architecture of the first bluetooth member device 110 or the second bluetooth member device 120.
The operation of the bluetooth audio broadcasting system 400 in fig. 12 will be further described with reference to fig. 13. Fig. 13 is a simplified flowchart of a method for audio broadcasting using BLE audio technology according to a fourth embodiment of the present invention.
Basically, the respective processes in FIG. 13 operate in the same manner as the corresponding processes in the embodiment of FIG. 11 described above. Thus, the bluetooth audio broadcasting system 400 of fig. 12 may broadcast audio to a plurality of bluetooth member devices in a manner similar to the bluetooth audio broadcasting system 400 of fig. 10 described above.
However, during the audio broadcasting process of the audio broadcasting device 150 (i.e., during the process of the audio broadcasting device 150 repeating the process 222 and the process 224 of fig. 13), if the aforementioned user of the multi-member bluetooth device wants to adjust the volume of the relevant bluetooth member device, the user can perform a specific operation on the first trigger circuit 816 of the first bluetooth member device 110, so that the first trigger circuit 816 generates and transmits a user trigger signal to the first control circuit 114. Alternatively, the user may perform a specific operation on the second trigger circuit 826 of the second bluetooth member device 120, so that the second trigger circuit 826 generates and transmits a user trigger signal to the second control circuit 124.
If the user performs a specific operation on the first trigger circuit 816, the first control circuit 114 may generate a volume adjustment request VAR according to the user trigger signal generated by the first trigger circuit 816, and transmit the volume adjustment request VAR to the communication circuit 1061 of the host device 1060 via the first wireless communication circuit 815. Similarly, if the user performs a specific operation on the second trigger circuit 826, the second control circuit 124 can generate a volume adjustment request VAR according to the user trigger signal generated by the second trigger circuit 826, and transmit the volume adjustment request VAR to the communication circuit 1061 of the main control device 1060 through the second wireless communication circuit 825.
The difference from the foregoing embodiment of fig. 11 is that in the embodiment of fig. 13, the processing circuit 1065 of the master device 1060 performs the process 1132 in fig. 13 when the communication circuit 1061 receives the volume adjustment request VAR from the first bluetooth member device 110 or the second bluetooth member device 120.
In the process 1132, the processing circuit 1065 may generate a volume adjustment indication indicating a volume adjustment direction (e.g., up or down) according to the volume adjustment request VAR transmitted by the first bluetooth member device 110 or the second bluetooth member device 120, and may transmit the volume adjustment indication to the first wireless communication circuit 815 of the first bluetooth member device 110 and the second wireless communication circuit 825 of the second bluetooth member device 120 by using various Radio Access Technologies (RATs) other than bluetooth communication methods by using the communication circuit 1061 to indicate the first bluetooth member device 110 and the second bluetooth member device 120 to synchronously adjust the volume.
In this case, the first bluetooth member device 110 and the second bluetooth member device 120 in fig. 12 may perform the processes 1134 and 1136 described above to receive the volume adjustment indication from the main control device 1060, and adjust the gain value of the corresponding audio playback circuit according to the volume adjustment indication.
Since the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume according to the volume adjustment indication from the host 1060, when the first audio processing circuit 112 adjusts the volume of the first audio playing circuit 113, the second audio processing circuit 122 also synchronously adjusts the volume of the second audio playing circuit 123.
In other words, the bluetooth audio broadcasting system 400 of fig. 12 also allows the user to synchronously adjust the volume of the associated bluetooth member devices in the bluetooth audio broadcasting system 400.
Similar to the aforementioned embodiment of fig. 10, the communication circuit 1061 of the master device 1060 in fig. 12 may instead use bluetooth communication technology to transmit the volume adjustment indication to the first bluetooth communication circuit 111 of the first bluetooth member device 110 and the second bluetooth communication circuit 121 of the second bluetooth member device 120. In this case, the first bluetooth member device 110 can use the first bluetooth communication circuit 111 to receive the volume adjustment indication from the host 1060, and the second bluetooth member device 120 can use the first bluetooth communication circuit 111 to receive the volume adjustment indication from the host 1060. As such, the first wireless communication circuit 815 and/or the second wireless communication circuit 825 shown in fig. 10 can be omitted.
Additionally, in some embodiments, the second trigger circuit 826 in the second bluetooth member device 120 of fig. 8 may also be omitted.
In some embodiments in which the communication circuit 1061 of the host 1060 utilizes bluetooth communication technology instead to transmit the volume adjustment indicator to the first bluetooth member device 110 and the second bluetooth member device 120, the processing circuit 1065 of the host 1060 may insert the volume adjustment indicator into one or more target data items in accordance with the operation of the audio broadcasting device 150 in the process 502 of fig. 5. In addition, the processing circuit 1065 may control the communication circuit 1061 to operate in a target transmission mode to transmit the one or more target data items to the first bluetooth member device 110 and the second bluetooth member device 120, according to the operation of the audio broadcasting device 150 in the process 504 of fig. 5. The communication circuit 1061 communicates the one or more target data items to the first bluetooth member device 110 and the second bluetooth member device 120 in the target delivery mode in the same manner as the process 504 and 506 of fig. 5. For the sake of brevity, the description is not repeated here.
In practical applications, the master device 1060 of fig. 12 can synchronously adjust the volume levels of other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 by using the volume adjustment indication according to the aforementioned manner of adjusting the volume levels of the first bluetooth member device 110 or the second bluetooth member device 120. However, this is only an exemplary embodiment and does not limit the practical implementation of the present invention.
In fact, the volume levels of other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 may be controlled by another master device (e.g., the master device 1070). In this case, the third bluetooth member device 130 and the fourth bluetooth member device 140 synchronously adjust the volume level when playing the predetermined audio data according to the volume adjustment indication generated by the master control device 1070.
The foregoing description regarding the embodiments and connections of the related circuits and devices in fig. 10 also apply to the bluetooth audio broadcasting system 400 in fig. 12. In addition, since the respective processes in fig. 13 operate in substantially the same manner as the corresponding processes in the embodiment of fig. 11, the description of the operation process of fig. 11 is also applicable to the embodiment of fig. 13. For the sake of brevity, the description is not repeated here.
As can be seen from the above descriptions of fig. 10 to fig. 13, before the multi-member bluetooth device in the bluetooth audio broadcasting system 400 starts to play the predetermined audio data transmitted from the audio broadcasting device 150, the first bluetooth member device 110 and the second bluetooth member device 120 adjust the volume of the first audio playing circuit 113 and the volume of the second audio playing circuit 123 to be close to or equal to the predetermined volume according to the predetermined volume indication transmitted from the audio broadcasting device 150.
Therefore, when the first bluetooth member device 110 starts to play the predetermined audio data from the audio broadcasting device 150 by using the first audio playback circuit 113, the volume level emitted by the first audio playback circuit 113 is close to or equal to the predetermined volume level. Similarly, when the second bluetooth member device 120 starts to play the predetermined audio data from the audio broadcasting device 150 by using the second audio playing circuit 123, the volume level emitted by the second audio playing circuit 123 is close to or equal to the predetermined volume level.
In this way, the volume generated when the first audio playback circuit 113 and the second audio playback circuit 123 start to synchronously play the predetermined audio data can make the user feel comfortable without causing discomfort or discomfort to the user.
In addition, since the volume levels of the first audio playback circuit 113 and the second audio playback circuit 123 when the first audio playback circuit and the second audio playback circuit start to synchronously play the predetermined audio data are preset to be close to or equal to the predetermined volume levels, even if the audio broadcasting apparatus 150 starts to perform the audio broadcasting without psychological expectation, the user is prevented from being scared due to the excessive volume of the audio broadcasting.
Similarly, other bluetooth member devices (e.g., the third bluetooth member device 130 and the fourth bluetooth member device 140) in the bluetooth audio broadcasting system 400 adjust the volume of the corresponding audio playing circuit (not shown) to be close to or equal to the predetermined volume according to the predetermined volume indication from the audio broadcasting device 150 before starting to play the predetermined audio data from the audio broadcasting device 150. Therefore, the volume level emitted by the other bluetooth member devices in the bluetooth audio broadcasting system 400 when they start to synchronously play the predetermined audio data can also be comfortable for the user without causing discomfort or discomfort to the user.
In addition, during the process of the multiple bluetooth devices in the bluetooth audio broadcasting system 400 playing the audio data broadcasted by the audio broadcasting device 150, the user can further operate the master control device 1060 to cause the master control device 1060 to transmit a volume adjustment indication to the respective bluetooth member devices (e.g., the aforementioned first bluetooth member device 110 and the second bluetooth member device 120) to synchronously adjust the volume of the related bluetooth member devices. In other words, the aforementioned bluetooth audio broadcasting system 400 allows the user to adjust the volume of different bluetooth member devices in the bluetooth audio broadcasting system 400 synchronously.
Furthermore, the bluetooth audio broadcasting system 400 employs BLE audio technology for audio broadcasting, and the audio broadcasting device 150 may employ a low complexity communication codec (LC3) to encode predetermined audio data. Therefore, compared to the conventional audio broadcasting method, the audio broadcasting method adopted by the bluetooth audio broadcasting system 400 can not only reduce the power consumption of the multi-member bluetooth devices, thereby prolonging the service time of the multi-member bluetooth devices, but also effectively improve the overall audio quality of the audio broadcasting.
It should be noted that the execution sequence of the processes in the above flowcharts is only an exemplary embodiment, and is not limited to the actual implementation of the invention.
For example, the process 206 in fig. 2 and/or fig. 4 may be performed before the process 202 and/or the process 204, or may be performed simultaneously with the process 202 or the process 204.
For another example, the flow 206 in fig. 11 and/or fig. 13 may be performed before the flow 1102, or may be performed simultaneously with the flow 1102.
For another example, the process 222 in fig. 2, 4, 11 and/or 13 may be performed before the process 208 and/or the process 210, or may be performed simultaneously with the process 208 or the process 210.
For another example, in some embodiments, the aforementioned processes 208 to 220 in fig. 4 may also be omitted.
For another example, in some embodiments, the aforementioned processes 208, 210, 1112, 1114, and 1116 in fig. 11 and 13 may also be omitted.
Certain terms are used throughout the description and claims to refer to particular elements, and those skilled in the art may refer to like elements by different names. In the present specification and claims, the difference in the names is not used as a way of distinguishing the elements, but the difference in the functions of the elements 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 a first element is coupled to a second element, the first element can be directly connected to the second element through an electrical connection or a signal connection such as wireless transmission or optical transmission, or indirectly connected to the second element through another element or a 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 reference to singular is intended to 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 in the claims of the present invention should be covered by the present invention.
[ description of symbols ]
100. 200, 300, 400
A first bluetooth member device
111
A first audio processing circuit
A first audio playback circuit
A first control circuit
A second bluetooth member device
A second bluetooth communication circuit
A second audio processing circuit
A second audio playback circuit
A second control circuit
A third bluetooth member device
A fourth bluetooth member device
150.. audio broadcasting device
202-234, 502-514, 1102, 1112-1116, 1126-1136
A volume source device
660. 1060, 1070
661. 1061
663. 1063
665. 1065
815
A first trigger circuit
825
A second trigger circuit.

Claims (10)

1. A bluetooth audio broadcasting system (300), comprising:
an audio broadcasting device (150) configured to broadcast one or more Bluetooth Low energy audio packets over a broadcast isochronous streaming logical transport channel;
a first bluetooth member device (110) comprising:
a first bluetooth communication circuit (111) configured to receive the one or more bluetooth low energy audio packets;
a first audio processing circuit (112); and
a first control circuit (114), coupled to the first bluetooth communication circuit (111) and the first audio processing circuit (112), configured to parse the one or more bluetooth low energy audio packets received by the first bluetooth communication circuit (111) to obtain predetermined audio data, and instruct the first audio processing circuit (112) to control a first audio playback circuit (113) to play the predetermined audio data; and
a second bluetooth member device (120) comprising:
a second bluetooth communication circuit (121) configured to receive the one or more bluetooth low energy audio packets;
a second audio processing circuit (122); and
a second control circuit (124), coupled to the second bluetooth communication circuit (121) and the second audio processing circuit (122), configured to parse the one or more bluetooth low energy audio packets received by the second bluetooth communication circuit (121) to obtain the predetermined audio data, and instruct the second audio processing circuit (122) to control a second audio playback circuit (123) to play back the predetermined audio data;
wherein the audio broadcasting device (150) further transmits a volume adjustment indication to the first Bluetooth member device (110) and the second Bluetooth member device (120) after the first Bluetooth member device (110) issues a Volume Adjustment Request (VAR);
wherein the first bluetooth communication circuit (111) is further configured to receive the volume adjustment indication, and the first control circuit (114) is further configured to control the first audio processing circuit (112) to adjust a volume of the first audio playback circuit (113) according to the volume adjustment indication;
the second bluetooth communication circuit (121) is further configured to receive the volume adjustment indication, and the second control circuit (124) is further configured to control the second audio processing circuit (122) to adjust a volume of the second audio playing circuit (123) according to the volume adjustment indication.
2. The bluetooth audio broadcasting system (300) as claimed in claim 1, wherein the first bluetooth member device (110) further comprises:
a first trigger circuit (816) coupled to the first control circuit (114) and configured to generate a user trigger signal according to a user operation;
wherein the first control circuit (114) is further configured to generate the Volume Adjustment Request (VAR) according to the user trigger signal.
3. The bluetooth audio broadcasting system (300) as claimed in claim 2, wherein the audio broadcasting device (150) is further configured to insert the volume adjustment indication into one or more target data items and to transmit the one or more target data items;
wherein the first bluetooth communication circuit (111) is further configured to receive the one or more target data items, and the first control circuit (114) is further configured to parse the one or more target data items to obtain the volume adjustment indication, and to control the first audio processing circuit (112) to adjust a gain value of the first audio playback circuit (113) according to the volume adjustment indication;
wherein the second bluetooth communication circuit (121) is further configured to receive the one or more target data items, and the second control circuit (124) is further configured to parse the one or more target data items to obtain the volume adjustment indication, and to control the second audio processing circuit (122) to adjust a gain value of the second audio playback circuit (123) according to the volume adjustment indication.
4. The bluetooth audio broadcasting system (300) according to claim 3, wherein the one or more target data items are selected from a group consisting of:
one or more advertisement indication packets;
one or more non-connectable advertisement indication packets;
one or more searchable advertisement indication packets;
one or more secondary advertisement indication packets;
one or more advertisement expansion indication packets;
one or more secondary link indication packets;
one or more secondary scan response packets;
one or more secondary synchronization indication packets;
one or more broadcast isochronous stream protocol data units; and
one or more broadcast isochronous group protocol data units.
5. The bluetooth audio broadcasting system (300) according to claim 2, further comprising:
a master control device (660), coupled to the audio broadcasting device (150), configured to receive the Volume Adjustment Request (VAR) and generate and transmit a Volume Adjustment Signal (VAS) to the audio broadcasting device (150) according to the Volume Adjustment Request (VAR);
wherein the audio broadcasting device (150) transmits the volume adjustment indication to the first Bluetooth member device (110) and the second Bluetooth member device (120) upon receiving the Volume Adjustment Signal (VAS).
6. A multi-member bluetooth device, comprising:
a first bluetooth member device (110) comprising:
a first bluetooth communication circuit (111) configured to receive one or more bluetooth low energy audio packets broadcast by an audio broadcasting device (150) via a broadcast isochronous streaming logical transport channel;
a first audio processing circuit (112); and
a first control circuit (114), coupled to the first bluetooth communication circuit (111) and the first audio processing circuit (112), configured to parse the one or more bluetooth low energy audio packets received by the first bluetooth communication circuit (111) to obtain predetermined audio data, and instruct the first audio processing circuit (112) to control a first audio playback circuit (113) to play the predetermined audio data; and
a second bluetooth member device (120) comprising:
a second bluetooth communication circuit (121) configured to receive the one or more bluetooth low energy audio packets broadcast by the audio broadcasting device (150) via the broadcast isochronous streaming logical transport channel;
a second audio processing circuit (122); and
a second control circuit (124), coupled to the second bluetooth communication circuit (121) and the second audio processing circuit (122), configured to parse the one or more bluetooth low energy audio packets received by the second bluetooth communication circuit (121) to obtain the predetermined audio data, and instruct the second audio processing circuit (122) to control a second audio playback circuit (123) to play the predetermined audio data;
wherein the audio broadcasting device (150) further transmits a volume adjustment indication to the first Bluetooth member device (110) and the second Bluetooth member device (120) after the first Bluetooth member device (110) issues a Volume Adjustment Request (VAR);
wherein the first bluetooth communication circuit (111) is further configured to receive the volume adjustment indication, and the first control circuit (114) is further configured to control the first audio processing circuit (112) to adjust a volume of the first audio playback circuit (113) according to the volume adjustment indication;
the second bluetooth communication circuit (121) is further configured to receive the volume adjustment indication, and the second control circuit (124) is further configured to control the second audio processing circuit (122) to adjust a volume of the second audio playing circuit (123) according to the volume adjustment indication.
7. The multi-member bluetooth device of claim 6, wherein the first bluetooth member device (110) further comprises:
a first trigger circuit (816) coupled to the first control circuit (114) and configured to generate a user trigger signal according to a user operation;
wherein the first control circuit (114) is further configured to generate the Volume Adjustment Request (VAR) according to the user trigger signal.
8. The multi-member bluetooth device of claim 7, wherein the audio broadcasting device (150) is further configured to insert the volume adjustment indication into one or more target data items and to transmit the one or more target data items;
wherein the first bluetooth communication circuit (111) is further configured to receive the one or more target data items, and the first control circuit (114) is further configured to parse the one or more target data items to obtain the volume adjustment indication, and to control the first audio processing circuit (112) to adjust a gain value of the first audio playback circuit (113) according to the volume adjustment indication;
wherein the second bluetooth communication circuit (121) is further configured to receive the one or more target data items, and the second control circuit (124) is further configured to parse the one or more target data items to obtain the volume adjustment indication, and to control the second audio processing circuit (122) to adjust a gain value of the second audio playback circuit (123) according to the volume adjustment indication.
9. The multi-member bluetooth device of claim 8, wherein the one or more target data items are selected from a group consisting of:
one or more advertisement indication packets;
one or more non-connectable advertisement indication packets;
one or more searchable ad indication packets;
one or more secondary advertisement indication packets;
one or more advertisement expansion indication packets;
one or more secondary link indication packets;
one or more secondary scan response packets;
one or more secondary synchronization indication packets;
one or more broadcast isochronous stream protocol data units; and
one or more broadcast isochronous group protocol data units.
10. The multi-member bluetooth device of claim 7, wherein the audio broadcasting device (150) further sends a predetermined volume indication to the first bluetooth member device (110) and the second bluetooth member device (120) prior to broadcasting the one or more bluetooth low energy audio packets;
wherein the first bluetooth communication circuit (111) is further configured to receive the predetermined volume indication, and the first control circuit (114) is further configured to control the first audio processing circuit (112) to preset the volume of the first audio playback circuit (113) according to the predetermined volume indication;
the second bluetooth communication circuit (121) is further configured to receive the predetermined volume indication, and the second control circuit (124) is further configured to control the second audio processing circuit (122) to preset the volume of the second audio playing circuit (123) according to the predetermined volume indication.
CN202111361185.5A 2020-12-18 2021-11-17 Bluetooth audio broadcasting system and multi-member Bluetooth device Pending CN114648863A (en)

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