Unlimited multi-terminal connection Bluetooth audio system based on broadcast

Abstract

The invention introduces an unlimited multi-terminal connection Bluetooth audio system based on a broadcast technology, and aims to break through the limitation of a traditional Bluetooth audio system on the equipment connection number and tone quality transmission. By utilizing the technology, the system supports seamless connection with an infinite number of playing terminals, the application range is greatly expanded, and the connection flexibility is improved. The LC3 audio decoding technology integrated in the system significantly improves the quality and efficiency of audio transmission, and ensures excellent auditory experience. Besides, the equipped digital power amplifier and the Bluetooth main control chip allow a user to flexibly process and optimize audio output of each channel through an advanced frequency division control technology, and support independent or combined sound channel output setting. The design of the system not only adapts to household and commercial environments, but also can be widely applied to scenes such as public speech and multi-room music playing, the functionality and operation convenience of the audio system are greatly improved, and the new possibility of the Bluetooth audio technology in multiple scenes is developed.

Description

Technical Field

[0001] The present invention relates to wireless audio transmission technology, in particular to the technical field of Bluetooth audio systems. More specifically, the present invention relates to an unlimited multi-terminal connection Bluetooth audio system based on broadcast technology. Through innovative broadcast technology, the system can support multiple terminal devices to receive audio signals at the same time, solve the limitations of traditional Bluetooth audio systems in terms of the number of device connections and sound quality transmission, and provide high-quality audio output. The system adopts LC3 audio decoding technology and digital power amplifier technology with intelligent frequency division control to optimize audio quality and system efficiency. This technology can not only greatly improve the stability of audio synchronous playback, but also provide flexible audio output solutions in multiple devices and multiple environments.

[0002] The technology of the present invention is particularly suitable for the demand of unlimited multi-terminal audio transmission, and can provide efficient and high-quality audio broadcasting in commercial environments, home entertainment systems and public activities. Its wide application scenarios and great compatibility make it have significant market prospects in many fields such as smart homes, audio systems, car audio, conference systems, etc. Background Art

[0003] With the rapid development of wireless audio technology, Bluetooth audio devices, such as Bluetooth headsets and sound systems, have become an indispensable part of daily life. Traditional Bluetooth audio systems usually adopt point-to-point (P2P) transmission mode. In this mode, the audio source device can only be paired with a few devices, which greatly limits the number of connections between devices. Although some new technologies, such as Bluetooth 5.0 and 5.2, begin to support one-to-many connections, they still face problems such as degraded sound quality, poor signal stability, and complex connection settings when connecting multiple devices at the same time.

[0004] Currently, existing multi-point Bluetooth technologies usually require users to manually pair and manage connections between devices. This not only increases the difficulty of operation for users, but also limits the flexibility and scalability of wireless audio systems. Especially in application scenarios where audio signals need to be broadcast to multiple listeners at the same time, such as large conferences, public speeches, sports events or home entertainment systems, traditional technologies cannot effectively meet the high requirements of these scenarios for audio quality and connection stability. Existing systems often cannot ensure that multiple devices receive audio signals synchronously, causing problems such as audio delays or disconnections.

[0005] In addition, traditional Bluetooth audio systems usually rely on complex hardware and software configurations, resulting in poor user experience, especially in scenarios where multiple devices need to be controlled simultaneously, audio output needs to be adjusted, etc. The operation is cumbersome and not intuitive enough. With the popularity of smart homes, smart offices, and large-scale public broadcasting systems, users are increasingly demanding more efficient and convenient wireless audio solutions.

[0006] Therefore, the market is in urgent need of an improved wireless audio system that can break through the limitations of traditional technologies, provide high-quality audio transmission to multiple terminal devices, and simplify the management and operation process of the devices. The present invention, by introducing broadcast technology, can achieve simultaneous broadcasting of an audio source to multiple audio devices, solving the problems of the prior art in terms of sound quality transmission, connection stability, and operational complexity. The system can not only significantly improve the stability and sound quality of the connection, but also simplify the user's operation process to meet the increasingly complex audio application needs. Summary of the invention

[0007] The present invention provides a broadcast-based, unlimited multi-terminal connection Bluetooth audio system, which aims to overcome the limitations of traditional Bluetooth audio systems in terms of multi-device connection and high-quality audio transmission. By integrating broadcast technology, LC3 (Low Complexity Communication Codec) audio decoder, multi-channel digital amplifier with intelligent frequency division control, and dynamic power management system, the present invention optimizes the audio transmission of multi-device synchronous playback, improves the sound quality, and improves the energy efficiency of the system.

[0008] The core of this system is the main control module integrated with Bluetooth broadcast technology, which supports broadcasting a single audio source to multiple receiving devices via Bluetooth 5.2 and above. The technology ensures that all connected devices can receive synchronized audio signals in real time and stably by optimizing audio data encapsulation and broadcast timing. The module also integrates the LC3 audio decoder for efficient decoding of audio signals, ensuring low bandwidth consumption while providing high-fidelity sound quality. The LC3 decoder uses advanced audio compression and decompression technology to provide better sound quality than traditional SBC codecs, especially at lower bit rates. It allows more flexible bit rate selection and can be adjusted as needed to find the best balance between sound quality and power consumption. The LC3 decoder uses an adaptive adjustment algorithm to automatically optimize decoding parameters (such as bit rate and sampling rate) according to the quality of the received signal, optimizes for various bandwidth requirements, and can work effectively under different network conditions. It is particularly suitable for use in bandwidth-constrained environments. This system uses a highly efficient Class D digital amplifier and is equipped with intelligent crossover control technology. By frequency decomposing the audio signal, the system can independently optimize the low-frequency and mid-high frequency audio output to provide a more delicate and rich sound quality performance. The power amplifier module also integrates real-time audio processing technologies such as dynamic range compression and bass enhancement, and dynamically adjusts the output according to different listening environments and user preferences to achieve the best listening experience. In addition, the power management system of the present invention adopts advanced battery management strategies, including charge and discharge control, energy recovery and intelligent sleep technology, to significantly improve the energy efficiency of the system and extend the battery life. In addition, the system automatically adjusts power consumption according to device usage and environmental conditions by combining environmental perception algorithms. For example, at night or when the device is inactive, the system will enter low power mode to further reduce energy consumption.

[0009] This system supports seamless connection of multiple devices through broadcast technology, solving the signal delay and stability problems of traditional Bluetooth systems in multi-device connection. LC3 audio decoding technology ensures high-fidelity sound quality even in low-bandwidth environments, optimizing the efficiency and quality of audio transmission. Intelligent frequency division control and real-time audio processing technology enable the system to flexibly adjust output according to different audio requirements and improve sound quality performance. The dynamic power management system effectively optimizes battery use, extends the battery life of the device, and ensures the stability and reliability of the system in long-term use.

[0010] In summary, the present invention provides an efficient, flexible and user-friendly unlimited multi-terminal Bluetooth audio solution by combining advanced audio processing, power management and Bluetooth technology. It is widely applicable to various application scenarios such as home entertainment, conference systems, commercial activities, etc., and improves the overall performance of the audio system and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1This is the working principle diagram of the broadcast module of this system.

[0012] Attached Figure 2 This is the overall architecture diagram of a broadcast-based, unlimited multi-terminal connection Bluetooth audio system.

[0013] Attached Figure 3 It is a user control panel diagram of a main control module of a broadcast-based unlimited multi-terminal connection Bluetooth audio system. DETAILED DESCRIPTION

[0014] This embodiment provides a broadcast-based unlimited multi-terminal connection Bluetooth audio system, which is designed to optimize the synchronous audio playback between multiple devices while maintaining high sound quality output and low power consumption. The following describes in detail the key component configuration and operation steps of the system.

[0015] Example 1: Application in home entertainment system In a home entertainment system, the broadcast-based unlimited multi-terminal connection Bluetooth audio system of the present invention can be used for synchronous playback of Bluetooth terminals in multiple rooms, providing a high-quality, seamless audio experience. The specific implementation is as follows: The system includes multiple Bluetooth terminal devices, and the number and type of Bluetooth terminal devices can be combined according to customer needs. Each device is equipped with a Bluetooth main control chip (supporting Bluetooth 5.2 and above) and a digital amplifier module. Each room in the home is equipped with at least one receiving device (such as a Bluetooth speaker or Bluetooth headset), and each device is connected to the central sound source device through broadcast technology. The central sound source device can be a TV, a smartphone or a home audio system.

[0016] The system operation process is as follows: The user turns on the audio source device (such as a smartphone, tablet or home entertainment controller), and can select the audio source (such as a TV or music file in the phone) through the application to connect to the main control broadcast transmitter module via Bluetooth: Through the application, the user can select the playback mode, such as stereo mode or surround sound mode, and adjust the volume, equalizer settings and sound effects according to personal preferences. After the selection is completed, the system automatically transmits the audio stream to all connected audio devices through broadcast technology. It is also possible to transmit audio to the main control broadcast transmitter module by wire through various audio interfaces (AUX, Spdif HDMI), and use the user control interface on the main control to select different sound effect modes or other operations. After all devices receive the audio stream, the system ensures that the audio signal is played synchronously to avoid audio delays or inconsistencies.

[0017] The system takes advantage of the broadcast protocol to broadcast the audio signal of the same audio source to audio devices in multiple rooms in the home simultaneously. For example, in the living room, kitchen and bedroom of the home, the system can ensure that the audio devices in each room play the same audio track or TV audio at the same time, without delay or interruption in audio playback, providing a perfect audio experience. All devices are wirelessly connected via Bluetooth LE, without the need for physical wires or manual pairing operations, simplifying user operations.

[0018] In home entertainment systems, since audio devices in different rooms may be at different distances or in obstacles, the system uses LC3 audio decoding technology to optimize audio transmission. This technology dynamically adjusts decoding parameters (such as bit rate, sampling rate, etc.) to ensure that audio quality remains high-fidelity and reduces latency even in environments with limited signal transmission.

[0019] The system automatically adjusts the output frequency band according to the audio characteristics of each audio device through an intelligent power amplifier and frequency division control system. Low-frequency signals are sent to the woofer, and mid- and high-frequency signals are distributed to the tweeter to ensure that the audio signals in each frequency band are played back to the best effect. The system uses automatically adjusted dynamic range compression technology to enhance bass and detail performance, allowing users to enjoy a balanced and high-quality audio experience in different rooms.

[0020] To extend the use time of the device, the system's built-in dynamic power management module automatically adjusts power consumption based on the current audio playback and device usage status. For example, when the home entertainment system is in low volume playback or standby mode, the system automatically reduces power consumption and returns to full power mode when audio is playing. In addition, the system will automatically enter low power mode based on environmental conditions, such as the activity status in the room, to save battery or power consumption.

[0021] Users can conveniently control various functions of the system through a dedicated application on a smartphone or other smart device. The user interface is simple and intuitive, supporting functions such as volume adjustment, sound effect settings, room selection and device management. Audio synchronization playback mode and personalized settings ensure that the audio system in each room can meet the user's auditory needs.

[0022] Example 2: Application in public speaking and commercial presentation In the application scenarios of public speeches and commercial exhibitions, the broadcast-based unlimited multi-terminal connection Bluetooth audio system of the present invention provides a clear and high-quality audio experience for all participants in the event through efficient audio transmission, synchronous playback and stable connection. Especially in large conferences, exhibitions and lectures, it can support multiple devices to receive and play audio signals at the same time, ensuring seamless and synchronous audio transmission.

[0023] During a public speech or business presentation, the audio source is usually the speaker's microphone or audio playback device. The audio source transmits the audio signal to the central audio broadcast unit through the Bluetooth main control chip, and after decoding using the LC3 audio decoding technology, the audio signal is broadcast to all receiving devices through the broadcast protocol. All Bluetooth audio devices receive audio signals through the Bluetooth LE protocol without manual intervention for pairing. Through this technology, audio signals can be broadcast to an unlimited number of receiving devices at the same time, ensuring that all participants can receive clear audio signals synchronously, avoiding the connection limitations and synchronization problems of traditional Bluetooth technology. The clock synchronization technology in the system ensures that all receiving devices remain synchronized when receiving audio, avoiding audio delays or asynchronization problems, and ensuring that participants in different areas can hear the same sound at the same time. When decoding audio signals, the LC3 decoding technology dynamically adjusts the audio quality according to the signal quality of different devices, ensuring that all receiving devices can maintain high-fidelity sound quality even in environments with long distances or weak signals.

[0024] The configuration and operation process of the system described in the above embodiment: Before a speech or presentation begins, the staff or host selects the audio source and configures the playback mode through a smart control device (such as a tablet, mobile phone, or dedicated controller). For example, select the speaker's microphone input, background audio track or audio file, and set the sound effects (such as equalizer adjustment, surround sound mode, etc.). Users do not need to pair manually, the system will automatically scan and connect all supported receiving devices. Each receiving device (such as Bluetooth audio or Bluetooth headset) will automatically connect to the central audio broadcast unit, receive the audio stream and start playing. The system ensures that all devices are fully synchronized during audio playback without delays or audio inconsistencies.

[0025] Since the acoustic environment of the lecture venue may be different, the system uses intelligent amplifier and frequency division control technology to dynamically adjust the audio output according to the acoustic characteristics of each room or area. The system can dynamically adjust according to factors such as the received signal strength and ambient noise to ensure that the sound quality of different devices in different environments is always optimal.

[0026] Operators can use smart devices to monitor the audio transmission status in real time, including volume adjustment, device connection status, audio quality detection, etc. Staff can adjust the volume and sound effect settings at any time through smart device applications, or adjust the audio synchronization playback of multiple rooms on site.

[0027] The system can be used in large venues such as conference centers and exhibition halls, and can achieve full coverage of audio broadcasting through multiple Bluetooth audio devices to ensure that every participant can receive high-quality audio. In exhibitions and commercial activities, the system can provide real-time audio transmission for multiple exhibition areas and ensure the synchronization of audio signals between different booths, making the audio experience of the entire event smoother and more coordinated. For multiple small conference rooms or lecture halls, the system can adjust the audio output range and sound effect settings according to actual needs to ensure that all participants can get a clear audio experience.

[0028] Specifically: Combination Figure 1 As shown, the broadcast-based unlimited multi-terminal connection Bluetooth audio system mainly includes the following core modules: a main control module with integrated Bluetooth broadcast (using a chip supporting Bluetooth 5.2 (such as Qualcomm or Realtek's latest Bluetooth chip), integrated broadcast function, and supporting multiple terminal devices to receive audio streams at the same time. LC3 audio decoder, multi-channel digital power amplifier and intelligent frequency division control system, dynamic power management system, these modules work together to achieve multi-device connection, high-quality audio transmission and system energy efficiency optimization; The unrestricted multi-terminal connection Bluetooth audio system based on broadcasting is characterized by integrating a main control module of Bluetooth broadcasting: the module adopts a Bluetooth chip that supports Bluetooth 5.2 and above, and integrates a broadcasting function, and the signal processing unit built into the chip is responsible for the packaging of audio data and the optimization of broadcast timing; by writing a specific firmware, the Bluetooth chip is configured to work in mode, and the firmware implements the audio data packaging protocol and broadcast timing control algorithm to ensure the real-time synchronous transmission of the audio stream; The broadcast-based unlimited multi-terminal connection Bluetooth audio system is characterized by: LC3 audio decoder: the LC3 audio decoder is integrated in the main control module as a part of the audio data processing chain; the decoder adopts LC3 codec technology to decode the received audio data. During the decoding process, the decoder dynamically adjusts the decoding details, such as bit rate, sampling rate, etc., according to the quality of the received signal to optimize the sound quality; The broadcast-based unlimited multi-terminal connection Bluetooth audio system is characterized by a multi-channel digital power amplifier and an intelligent frequency division control system: the digital power amplifier module adopts a high-efficiency Class D amplifier design and is equipped with multiple independent audio channel outputs. Each channel is equipped with an intelligent frequency division control and can be independently processed according to the characteristics of the audio signal; the intelligent frequency division system decomposes the audio signal into different frequency bands such as bass and mid-high frequency according to the frequency components of the audio signal, and sends them to the corresponding audio channels for amplification respectively; the power amplifier module also integrates real-time audio processing technology, such as dynamic range compression and bass enhancement, to adapt to different listening environments and user preferences; The broadcast-based, unlimited multi-terminal connection Bluetooth audio system is characterized by a dynamic power management system: the power management system adopts advanced battery management chips and algorithms to achieve battery charge and discharge control, energy recovery and intelligent sleep technology; the system's built-in environmental perception algorithm can automatically adjust power consumption according to system usage and environmental conditions. When the system detects that there is no audio output for a long time or the device is in an inactive state, the power management system can automatically put the system into sleep mode to reduce power consumption.

[0029] Combination Figure 2 As shown, the working principle of the system broadcast module is characterized in that the transmitter transmits the audio stream in an uncompressed format via Bluetooth LE to provide wireless audio with CD quality, and the transmitter encodes the audio using the LC3 audio coding scheme to minimize latency and power consumption; The receiver scans for available streams. Once the receiver detects and locks on to an information stream, it decodes the audio in real time and plays it through headphones or speakers. The receiver can receive audio streams that are open for anyone to access, or private audio streams that are encrypted with a password. The broadcast module optimizes the encapsulation and broadcast timing of audio data through specific signal processing algorithms, ensuring that all connected devices can receive synchronized audio streams in real time. Communication between the transmitter and receiver is carried out through the Bluetooth LE broadcast mechanism, eliminating the need to manually pair each listener, achieving seamless audio transmission.

[0030] Combination Figure 3 As shown, the multi-channel digital power amplifier and intelligent frequency division control system is characterized in that: the digital power amplifier performs full-duplex communication with the MCU through the IIC mode, and is characterized in that SCL and SDA are IIC interfaces connected to the MCU, and the MCU controls the opening and closing of the digital power amplifier through this IIC interface; the digital power amplifier amplifies the adjusted audio signal with high fidelity, and independently optimizes the output of the audio signal through the frequency division design; The intelligent frequency division control system is characterized in that the digital power amplifier first collects the input audio signal and performs preliminary digital signal processing, then the system performs spectrum analysis on the audio signal to identify audio components in different frequency bands, and according to the results of the spectrum analysis, the intelligent frequency division control system distributes the audio signals in different frequency bands to the corresponding speakers.

[0031] Combination Figure 2 As shown, the method for broadcasting Bluetooth connection and audio synchronization is characterized in that the system includes a signal processing algorithm, and the signal processing algorithm is equipped with a high-precision clock source to ensure that the processing and transmission of audio data remain consistent in time. Through clock synchronization technology, it can be ensured that the audio signals between different devices remain highly consistent in time.

[0032] Through the description of the above embodiments, we can see that the broadcast-based unlimited multi-terminal connection Bluetooth audio system of the present invention successfully solves the limitations of traditional Bluetooth audio systems in multi-device connection and high-quality audio transmission. By integrating advanced technologies and algorithms, the system realizes synchronous audio playback of multiple devices in a large range, while improving the sound quality and energy efficiency of the system. The system has broad application prospects and can be applied to smart homes, conference systems, entertainment venues and other fields.

Claims

1. A broadcast-based, unlimited multi-terminal connection Bluetooth audio system, characterized by: It includes multiple Bluetooth terminals, each terminal is equipped with at least one Bluetooth main control chip and a digital power amplifier, which is used to receive and process audio signals from a central transmitter; the Bluetooth main control chip can use broadcast technology to receive and broadcast audio, and supports synchronous playback with an unlimited number of terminal devices; the digital power amplifier is electrically connected to the Bluetooth main control chip, and has the function of independently optimizing the output of signals in different frequency bands through frequency division control, including but not limited to medium and high frequency and low frequency signals.

2. The system according to claim 1, characterized in that: The Bluetooth main control chip further integrates LC3 audio decoding technology to optimize the decoding efficiency and transmission quality of audio signals, ensuring the fidelity of sound quality in low-bandwidth environments.

3. The system according to claim 1, characterized in that: Includes a user interface that allows the user to select an audio output mode, including independent left and right channel output, combined output mode, or surround sound mode, to enhance the spatial sense and immersiveness of the audio.

4. The system according to claim 1, characterized in that: The digital power amplifier has high-fidelity audio amplification function and integrates a dynamic power management module to dynamically adjust power consumption to optimize energy efficiency and extend the service life of the equipment.

5. The system according to claim 1, characterized in that: The system supports a variety of wireless and wired connection methods, including but not limited to broadcast, traditional Bluetooth, Wi-Fi, and Ethernet, ensuring optimal connectivity and flexibility in various network environments.

6. The system according to claim 1, characterized in that: The entire audio system can be controlled via an app for a smartphone or other smart device, which provides advanced audio settings, including adjustment of the audio equalizer, selection of preset sound fields, and application of custom audio effects.

7. The system according to claim 1, characterized in that: Supports real-time audio processing technology, including automatic gain control (AGC), echo cancellation, noise suppression, and audio dynamic range compression to provide clear, layered, and stable audio output.

8. The system according to claim 1, characterized in that: Includes an audio source detection module to automatically identify the type of connected audio source (such as digital, analog or network stream) and automatically switch to the appropriate input channel to optimize audio processing flow and improve user convenience.

9. The system according to claim 1, characterized in that: The system is equipped with an environmental sensing module that can automatically adjust audio output parameters such as volume and equalizer settings according to the noise level and acoustic characteristics of the current environment to ensure the best sound quality output and listening experience.

10. The system according to claim 1, characterized in that: The system includes remote fault diagnosis and update functions, allowing maintenance support to be received remotely via the network, including firmware updates and performance optimization, ensuring long-term stable operation of the system and adapting to future technological improvements.

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