High-resolution lossless audio transmission device

Abstract

The invention belongs to the field of wireless audio transmission, and discloses a high-resolution lossless audio transmission device. The device comprises a core control board, a UWB module and a coding and decoding chip, and the core control board is connected with functional devices such as a user button, a reset button, a guide loading button, a programmer and a user LED and energy supply devices such as a Type-C connector and a power manager. An audio core is arranged in the UWB module and comprises a universal audio frame, a typical codec, a UWB wireless core and a UWB wireless interface, and the typical codec supports various coding and decoding modes such as ADPCM, FLAC and WAV. The device disclosed by the invention realizes high-resolution lossless audio transmission based on the UWB technology, the transmitted audio has high signal-to-noise ratio, low delay and high synchronism, the quality limitation of traditional Bluetooth and Wi-Fi in audio transmission is solved, and the device is suitable for a high-fidelity audio transmission scene.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wireless audio transmission, and in particular to a high-resolution lossless audio transmission device. BACKGROUND

[0002] Ultra-wideband (UWB) is a wireless communication technology that transmits data through an extremely wide frequency range, and has the characteristics of high-precision positioning, low power consumption and high bandwidth.

[0003] In existing audio devices, Bluetooth, Wi-Fi and other wireless protocols are still used for audio transmission. Although Bluetooth is widely used, has good device compatibility and low power consumption, it has limitations in the quality of transmitted audio and cannot perform lossless transmission. WI-FI has higher bandwidth and can achieve high-quality audio transmission, but it is not suitable for mobile audio devices. Therefore, the application provides a high-resolution lossless audio transmission device based on UWB technology, which introduces UWB technology into audio transmission and can provide high-resolution lossless audio transmission. SUMMARY

[0004] The application aims to provide a high-resolution lossless audio transmission device that can reliably transmit audio with high signal-to-noise ratio based on UWB technology.

[0005] To achieve the above-mentioned purpose, the application provides the following technical solutions:

[0006] A high-resolution lossless audio transmission device includes a core control board, a UWB module and a codec chip. The core control board is connected to five functional devices, including a user button, a reset button, a boot loader button, a programmer and a user LED. The core control board is connected to two power supply devices, including a Type-C connector and a power manager. The power manager is connected to a Type-C connector. The power manager is connected to a LiPo battery connector. The codec chip is used for data encoding and decoding. The UWB module is used for efficient audio transmission.

[0007] The UWB module is provided with an audio core for managing audio samples. The audio core includes a general audio framework, a typical codec, a UWB wireless core and a UWB wireless interface. The general audio framework includes audio packaging, audio processing algorithms, mixers, audio loss pipelines, clock drift compensation and audio compression.

[0008] The frame structure in the UWB wireless core supports data frames, synchronization frames and confirmation frames. The data frames carry application payloads and can be transmitted as master frames or in automatic response mode. When the connection enables automatic synchronization mode, the synchronization frame is used. If the connection queue is empty, a frame containing only the header is sent to maintain network synchronization. The confirmation frame does not contain a payload and is only sent in automatic response.

[0009] The transmission framework of the audio core is a wireless API, a WPS interface, a WPS wireless protocol stack, an ultra-wideband radio frequency chip interface, a UWB radio frequency chip driver, a hardware abstraction layer and a board-level support package.

[0010] Further, the typical decoder includes ADPCM, FLAC, WAV, ALAC, LC3plus, SCL6 and L2HC.

[0011] Further, the core control board is an ARM Cortex-M series microcontroller.

[0012] Principle of the technical solution: the device sets a wireless protocol stack (WPS) in the UWB core transmission framework, and high-resolution lossless audio transmission is realized by means of the WPS and UWB technology. The audio core based on UWB in the device not only supports ADPCM audio transmission, but also is compatible with other lossless audio codecs.

[0013] The beneficial effects of the technical solution are that the lossless audio transmission scheme based on UWB of the device can reliably transmit audio with a high signal-to-noise ratio, the wireless core in the device redesigns the frame structure, which can ensure continuous and efficient audio transmission on UWB, the device can realize high-resolution lossless audio transmission, and the problem of synchronization in the audio scene can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural framework diagram of the device;

[0015] Figure 2 It is an audio core framework diagram of the device;

[0016] Figure 3 It is a framework diagram of the core components in the transmission framework of the device;

[0017] Figure 4 It is a frame structure in the UWB wireless core of the device;

[0018] Figure 5 It is a bandwidth scheduling design diagram in the wireless protocol stack of the device;

[0019] Figure 6 It is a PCB layout and physical prototype diagram of the device;

[0020] Figure 7 It is an audio evaluation result of the device; DETAILED DESCRIPTION

[0021] The application will be further described in detail below in combination with the drawings and embodiments:

[0022] As Figure 1 shown, a system block diagram of a high-resolution lossless audio transmission device includes a core control board, a UWB module, and a decoding chip, the core control board is connected with five functional devices, namely, a user button, a reset button, a boot loading button, a programmer, and a user LED, and the core control board is connected with two power supply devices, namely, a Type-C connector and a power manager, wherein the power manager is connected with the Type-C connector, the power manager is connected with a LiPo battery connector, the codec chip is used for data encoding and decoding, and the codec chip is connected with a line input connector and a headphone connector.

[0023] As Figure 2 shown, an audio core block diagram of the device, in the device, an audio core for managing audio samples is arranged in the UWB module, the main function of the audio core is to manage audio samples, the audio core includes an audio framework, a typical codec, a UWB wireless core, and an API, the audio core in the UWB module not only supports ADPCM audio transmission, but also can be compatible with other lossless audio codecs. The general audio framework is mainly composed of six main components, including audio packaging, audio processing algorithm, audio mixing / rollback, audio pipeline, clock drift compensation, and audio compression. The typical codec includes the following encoding modes: ADPCM, FLAC, WAV, ALAC, LC3plus, SCL6, and L2HC.

[0024] As Figure 3 shown, a block diagram of core components in the transmission framework of the device, the transmission core components in the UWB module include a board support package (BSP), the BSP contains a wireless interface, a UWB radio frequency chip interface, and a hardware abstraction layer, the UWB radio frequency chip is provided with a WPS wireless protocol stack and an interface of the WPS wireless protocol stack, and the hardware abstraction layer is a UWB radio frequency chip driver.

[0025] As Figure 4 shown, a frame structure diagram in the UWB wireless core of the device, according to the characteristics of audio data stream transmission, the frame structure is redesigned in the wireless core to ensure continuous and efficient audio data transmission on the ultra-wideband (UWB). The wireless core supports three types of frames: data frames, synchronization frames (Sync frames), and acknowledgement frames (Ack frames). It should be noted that some bytes in the physical layer payload are reserved for the MAC layer. The data frame carries the application payload and can be transmitted as a master frame or in automatic response mode. When the connection enables the auto-sync mode, the synchronization frame will be used. If the connection queue is empty, a frame containing only the header will be sent to maintain network synchronization. The acknowledgement frame does not contain the payload and is only sent in automatic response. This structure ensures the reliability and efficiency of communication within the network.

[0026] like Figure 5 The figure shows the bandwidth scheduling design within the wireless protocol stack of the present invention. Considering the bandwidth requirements of each device is crucial in the bandwidth scheduling design within the wireless protocol stack. The peak rate of a connection can be determined based on the number of time slots allocated within a specific time period. Synchronous time slots, consisting of regular frames containing a header and payload, or empty frames containing only a header, play a key role in maintaining synchronization. The maximum transmission period is set at 10 milliseconds; exceeding this interval may result in loss of synchronization between the transmitter and receiver. If a transmitter has no data to transmit during a synchronous time slot, it can utilize the auto-sync feature. This feature allows the wireless core to automatically manage the transmission of synchronization frames. In the first time slot, the transmitter in network 1 performs a clear channel agreement (CCA) to determine if the wireless link is clear, and thus begins transmission on channel 0. Simultaneously, the transmitter in network 2 also performs a CCA, but because the transmitter in network 1 recently used channel 0, the CCA test fails. Therefore, the transmitter in network 2 waits for a preset delay before trying again. In the second time slot, because both CCA tests succeed, both transmitters successfully transmit simultaneously.

[0027] like Figure 6 Shown are the printed circuit board (PCB) layout and physical prototype of the device of the present invention.

[0028] The device of the present invention was evaluated for audio transmission: one evaluation board was connected to a lossless audio source via the line-in port, and the other evaluation board was connected to a speaker via the headphone port. The host computer software configured the development kit to operate in stereo mode, with a sampling frequency of 48 kHz, a bit rate of 1536 kilobits per second, a bit depth of 16 bits, and a delay of 10 milliseconds. The experimental results are shown in Figure 2. Figure 5 As shown in the figure, it can be seen that the device designed based on UWB technology of the present invention can reliably transmit audio with a high signal-to-noise ratio and has a low delay, and can solve the synchronization problem in the audio scene.

[0029] The above is only an embodiment of the present invention, and common knowledge such as the specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A high-resolution lossless audio transmission device, characterized by: It includes a core control board, a UWB module and a codec chip. The core control board is connected to five functional devices: a user button, a reset button, a boot loader button, a programmer, and a user LED. The core control board is connected to two energy supply devices: a Type-C connector and a power manager. The power manager is connected to the Type-C connector, and the power manager is connected to a LiPo battery connector. The codec chip is used for data encoding and decoding, and the UWB module is used for efficient audio transmission. The UWB module is equipped with an audio core for managing audio samples. The audio core includes a general audio framework, a typical codec, a UWB wireless core, and a UWB wireless interface. The general audio framework includes audio packaging, audio processing algorithms, a mixer, an audio artifact pipeline, clock drift compensation, and audio compression. The frame structure in the UWB wireless core supports data frames, synchronization frames, and confirmation frames. Data frames carry application payloads and can be transmitted as main frames or in automatic acknowledgement mode. When the connection is in automatic synchronization mode, synchronization frames are used. If the connection queue is empty, frames containing only the header are sent to maintain network synchronization. Confirmation frames do not contain payloads and are only sent in automatic acknowledgement mode. The core components of the audio core transmission framework include a board support package, which includes a wireless interface, an ultra-wideband RF chip interface and a hardware abstraction layer. The ultra-wideband RF chip is provided with a WPS wireless protocol stack and a WPS interface, and the hardware abstraction layer includes a UWB RF driver.

2. A high-resolution lossless audio transmission device according to claim 1, characterized in that: The typical decoders include ADPCM, FLAC, WAV, ALAC, LC3plus, SCL6 and L2HC encoding methods.

3. A high-resolution lossless audio transmission device according to claim 1, characterized in that: The core control board is an ARM Cortex-M series microcontroller.

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