A multi-mode switchable mobile sound card

Abstract

This invention relates to a mobile sound card capable of switching between multiple modes. The preset rule is that the initial mode of the mobile sound card is a stereo dual-channel mode. It includes a signal receiving module for receiving a first signal sent by an interconnected terminal via a proprietary protocol, and processing the first signal to obtain a second signal. It also includes a control module for receiving the second signal sent by the signal receiving module, switching the mode to a standard four-channel mode, a multi-channel mode, or a custom transmission mode, and sending a third signal to the interconnected terminal. Finally, it includes an audio processing module for receiving a fourth signal sent by the interconnected terminal via a proprietary protocol, and processing the fourth signal to obtain a fifth signal. By implementing the above technical solution, the following technical effects are achieved: flexible switching between three modes is realized without relying on specific devices, improving the versatility and applicability of professional mobile sound card devices, and meeting the usage needs in different scenarios.

Description

Technical Field

[0001] This invention relates to the field of mobile sound card technology, and in particular to a mobile sound card capable of switching between multiple modes. Background Technology

[0002] Currently, professional portable sound cards are essential tools for creators and musicians in audio creation. In practical use, professional music creators typically require professional stereo (two-channel) sound when using mainstream DAW software such as ProTools and LogicPro on PCs or mobile smart devices; while when using self-developed apps for multi-track recording and creation, they need to switch to multi-channel sound to achieve separate recording functions such as stereo separation of vocals and musical accompaniment.

[0003] Different smart devices support multi-channel audio in varying degrees. Some devices can recognize multi-channel sound cards well, while others, due to version, model, or other issues, have poor multi-channel compatibility or even do not support multi-channel recording. Currently, there is a lack of a solution that is not dependent on specific devices, can flexibly switch modes, and stably transmits multi-channel data, which affects the versatility of devices and the user experience. Summary of the Invention

[0004] This invention provides a mobile sound card with multi-mode switching, which solves the problems of existing modes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A mobile sound card with multiple modes that can be switched, wherein the preset rule is that the initial mode of the mobile sound card is stereo dual-channel mode; It includes a signal receiving module, used to receive a first signal sent by an interconnected terminal through a private protocol, and to process the first signal to obtain a second signal; Includes a control module for receiving a second signal sent by a signal receiving module, switching the mode to a standard four-channel mode, a multi-channel mode, or a custom transmission mode, and sending a third signal to the interconnected terminal; The first signal content includes target mode identification information and target mode instruction verification information. The target mode is a standard four-channel mode, a multi-channel mode, or a custom transmission mode. The second signal content is to switch the mode to a standard four-channel mode or a custom transmission mode. The third signal content is feedback information indicating successful mode switching. It includes an audio processing module for receiving a fourth signal sent by an interconnected terminal via a proprietary protocol, and processing the fourth signal to obtain a fifth signal; It includes an interconnection communication module for sending the fourth signal to the interconnection terminal.

[0006] Preferably, the interconnection communication module includes at least one of the following: a Bluetooth communication module, a Wi-Fi communication module, an infrared communication module, and a near-field communication (NFC) connection module.

[0007] Preferably, after the control module switches the mode to standard four-channel mode or custom transmission mode, when switching modes again, the mode of the mobile sound card changes to the initial mode and then switches to the target mode.

[0008] Preferably, the custom transmission method is endpointbulk transmission.

[0009] Preferably, the proprietary protocol is BLE or HID, Bluetooth 4.0+, or USB Audio Class (UAC) 1.0 / 2.0 / 3.0.

[0010] Preferably, the step of the audio processing module transmitting data using the custom transmission mode is as follows: Step 1: If it is determined that the signal receiving device is a version below USB 2.0 or has insufficient bandwidth, compress and encode the fourth signal; if it is determined that the signal receiving device has sufficient bandwidth, do not compress and encode the fourth signal. Step 2: The judged and processed fourth signal is encapsulated into a fifth signal according to a private protocol. The private protocol specifies the frame start symbol, number of channels, data blocks for each channel, encoding method identifier, data length, check code, and frame end symbol of the data frame. Step 3: Transmit the fifth signal to the interconnected terminal via the USB interface.

[0011] Preferably, step 2 includes: The fourth signal, after being judged and processed, is encrypted using the AES-256 encryption algorithm. The key is generated through RSA-2048 digital signature negotiation during device pairing. The encrypted fourth signal is encapsulated according to a private protocol to form a fifth signal. The private protocol specifies the start-of-frame character, number of channels, data blocks for each channel, encoding method identifier, data length, checksum, and end-of-frame character of the data frame.

[0012] By implementing the above technical solutions, the following technical effects are achieved: External USB sound card devices always default to stereo two-channel mode and can switch to standard four-channel, multi-channel, or custom transmission modes (using a proprietary audio transmission protocol), with all three modes providing stereo downlink. The custom transmission mode transmits multi-channel data based on a proprietary protocol and selects whether to compress and encode data according to bandwidth conditions, effectively improving device applicability and data transmission stability. It enables flexible switching between the three modes without relying on specific devices, enhancing the versatility and applicability of professional mobile sound card devices and meeting the needs of different scenarios. Attached Figure Description

[0013] Figure 1 A schematic diagram illustrating the workflow of a multi-mode switchable mobile sound card provided by this invention; Figure 2 This invention provides a schematic diagram of the workflow of a custom mode for a mobile sound card with multi-mode switching. Detailed Implementation

[0014] To better understand the technical solution of the present invention, the embodiments provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0015] like Figure 1-2 As shown, it can be understood that this embodiment provides A mobile sound card with multiple modes that can be switched, wherein the preset rule is that the initial mode of the mobile sound card is stereo dual-channel mode; It includes a signal receiving module, used to receive a first signal sent by an interconnected terminal through a private protocol, and to process the first signal to obtain a second signal; Includes a control module for receiving a second signal sent by a signal receiving module, switching the mode to a standard four-channel mode, a multi-channel mode, or a custom transmission mode, and sending a third signal to the interconnected terminal; The first signal content includes target mode identification information and target mode instruction verification information. The target mode is a standard four-channel mode, a multi-channel mode, or a custom transmission mode. The second signal content is to switch the mode to a standard four-channel mode or a custom transmission mode. The third signal content is feedback information indicating successful mode switching. It includes an audio processing module for receiving a fourth signal sent by an interconnected terminal via a proprietary protocol, and processing the fourth signal to obtain a fifth signal; It includes an interconnection communication module for sending the fourth signal to the interconnection terminal.

[0016] In this embodiment, the external USB sound card device defaults to stereo dual-channel mode. The device maintains this mode and provides dual-channel audio input and output services to meet the basic needs of users when using mainstream DAW software such as ProTools and LogicPro on PCs or mobile smart devices.

[0017] When a mode switch is required, any device sends a mode switch command data packet to the external USB sound card device via a proprietary command protocol. This data packet contains a target mode identifier (standard four-channel mode or a custom transmission mode), command verification information, etc. Upon receiving the data packet, the receiving module of the external USB sound card device verifies the command verification information. If the verification is successful, the control module executes the mode switch operation, switching the device to the target mode and sending a success message back to the sending device. After the switch, the device's downlink remains in dual-channel sound card mode.

[0018] Specifically, by receiving proprietary command protocols (including but not limited to BLE, HID, Bluetooth 4.0+, USB Audio Class (UAC) 1.0 / 2.0 / 3.0, etc.), it can switch to standard four-channel (including multi-channel) mode or a custom transmission mode (proprietary audio transmission protocol), and all three modes support stereo downlink. The custom transmission mode transmits multi-channel data based on a proprietary protocol and selects whether to compress and encode based on bandwidth conditions, effectively improving device applicability and data transmission stability. This mode setting is independent of specific devices, allows flexible mode switching, and stably transmits multi-channel data, improving device versatility and user experience. Furthermore, this mode additionally supports intelligent switching: the device automatically switches between modes by recognizing the type of connected terminal and the type of software launched (e.g., automatically switching modes when recognizing a self-developed multi-track APP or DAW software used on a PC), without manual triggering, improving ease of use. It achieves flexible switching between three modes independent of specific devices, enhancing the versatility and applicability of professional mobile sound cards and meeting the needs of different scenarios. In addition, the custom transmission mode is not limited to endpoint bulk transmission, but also supports mainstream interfaces such as USB-C (compliant with ENIEC62680 standard) and XLR, improving product compatibility and thus enhancing ease of use.

[0019] Based on the above embodiments, the interconnection communication module further includes at least one of the following: a Bluetooth communication module, a Wi-Fi communication module, an infrared communication module, and a near-field communication (NFC) connection module, to meet the needs of different usage scenarios and improve product adaptability.

[0020] Furthermore, based on the above embodiments, after the control module switches the mode to standard four-channel mode or custom transmission mode, when switching modes again, the mode of the mobile sound card changes to the initial mode and then switches to the target mode. During the switch, the default settings are returned first to improve the stability of signal transmission.

[0021] Based on the above embodiments, the custom transmission method is endpointbulk transmission, and the preferred transmission method is the transmission method with the widest applicability, which meets the usage needs of most products and improves product adaptability.

[0022] Based on the above embodiments, the proprietary protocol is BLE or HID, Bluetooth 4.0+, or USB Audio Class (UAC) 1.0 / 2.0 / 3.0. The preferred proprietary protocol is the most widely applicable method, meets the usage needs of most products, and improves product compatibility.

[0023] Based on the above embodiments, the step of the audio processing module transmitting data using the custom transmission mode is further as follows: Step 1: The external USB sound card device processes the multi-channel audio data. When the connection is a USB version below 2.0 or the bandwidth is insufficient, compression encoding is used. Specifically, depending on the transmission scenario, compression encoding methods such as SBC, LC3, aptX LowLatency (low latency scenario), and LDAC (high-definition scenario) are selected to process the multi-channel audio data and compress the fourth signal. If it is determined that the bandwidth of the signal receiving device is sufficient, no compression encoding is performed, and the original data is transmitted directly. The transmission supports sampling rates of 44.1kHz / 48kHz / 96kHz and bit depths of 16bit / 24bit / 32bit, which meets professional recording standards. Step 2: The judged and processed fourth signal is encapsulated into a fifth signal according to a private protocol. The private protocol specifies the frame start symbol, number of channels, data blocks for each channel, encoding method identifier, data length, check code, and frame end symbol of the data frame. Step 3: Transmit the fifth signal to the interconnected terminal via a custom transmission method (private audio data transmission protocol) through interfaces such as USB-C and XLR; Step 4: After receiving the custom transmission data, the self-developed APP on the interconnected terminal first identifies the complete data frame by parsing the frame start character and frame end character according to the private protocol, and then verifies the data integrity by checking the check code (not limited to CRC-32 check) and the data security by checking the SHA-256 hash value. If the data has been compressed and encoded, the corresponding decoder (not limited to sbc, lc3, aptXLowLatency, LDAC) is called to decode it. Finally, the data of each track (such as vocal track and accompaniment track) is separated according to the track identifier for multi-track recording and creation.

[0024] Specifically, when the external USB sound card device is in custom transmission mode, the bandwidth of the acquired multi-channel audio data (such as vocals, various instrument sounds, etc.) is first detected. If a USB 2.0 or lower connection or insufficient bandwidth is detected, the encoding module starts compression encoding such as SBC to process the multi-channel data; if the bandwidth is sufficient, the original data is directly retained. The processed multi-channel data enters the encapsulation module and is encapsulated according to a proprietary protocol. The proprietary protocol specifies that each data frame includes a frame start symbol, the number of channels, data blocks for each channel, encoding method identifier (if there is no encoding, it is marked as "none"), data length, CRC checksum, and frame end symbol. The encapsulated data frame is transmitted through the USB interface in a custom format. The self-developed APP on the receiving device receives the data in real time and sends it to the parsing module. The parsing module first identifies the complete data frame through the frame start symbol and frame end symbol, and then verifies the data integrity through the CRC checksum. After verification, the system determines whether decoding is required based on the encoding method identifier. If there is encoding, the corresponding decoder (such as the SBC decoder) is called to decode, ultimately obtaining multi-channel data for users to create multi-track audio.

[0025] Based on the above embodiments, step 2 further includes: The fourth signal, after being judged and processed, is encrypted using the AES-256 encryption algorithm. The key is generated through RSA-2048 digital signature negotiation during device pairing. The encrypted fourth signal is encapsulated according to a private protocol to form a fifth signal. The private protocol specifies the frame start symbol, number of channels, data blocks for each channel, encoding method identifier, data length, checksum, and frame end symbol of the data frame, which is used for multitrack recording and creation.

[0026] The foregoing has provided a detailed description of a method for multi-mode switching and multi-channel transmission of a mobile sound card device according to embodiments of the present invention. For those skilled in the art, there may be changes in specific implementation methods and application scope based on the ideas of the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A portable sound card with multi-mode switching capability, characterized in that, The default rule is that the initial mode of the mobile sound card is stereo dual-channel mode; It includes a signal receiving module, used to receive a first signal sent by an interconnected terminal through a private protocol, and to process the first signal to obtain a second signal; Includes a control module for receiving a second signal sent by a signal receiving module, switching the mode to a standard four-channel mode, a multi-channel mode, or a custom transmission mode, and sending a third signal to the interconnected terminal; The first signal content includes target mode identification information and target mode instruction verification information. The target mode is a standard four-channel mode, a multi-channel mode, or a custom transmission mode. The second signal content is to switch the mode to a standard four-channel mode or a custom transmission mode. The third signal content is feedback information indicating successful mode switching. It includes an audio processing module for receiving a fourth signal sent by an interconnected terminal via a proprietary protocol, and processing the fourth signal to obtain a fifth signal; It includes an interconnection communication module for sending the fourth signal to the interconnection terminal.

2. The mobile sound card with multi-mode switching according to claim 1, characterized in that, The interconnection communication module includes at least one of the following: a Bluetooth communication module, a Wi-Fi communication module, an infrared communication module, and a near-field communication (NFC) connection module.

3. The mobile sound card with multi-mode switching according to claim 1, characterized in that, After the control module switches the mode to standard four-channel mode or custom transmission mode, when switching modes again, the mode behavior of the mobile sound card is the initial mode and then the target mode is switched.

4. The multi-mode switchable mobile sound card according to claim 1, characterized in that, The custom transmission method is endpointbulk transmission.

5. The mobile sound card with multi-mode switching capability according to claim 1, characterized in that, The proprietary protocols are BLE or HID, Bluetooth 4.0+, and USB Audio Class (UAC) 1.0 / 2.0 / 3.

0.

6. The multi-mode switchable mobile sound card according to claim 1, characterized in that, The steps for the audio processing module to transmit data using the custom transmission mode are as follows: Step 1: If it is determined that the signal receiving device is a version below USB 2.0 or has insufficient bandwidth, compress and encode the fourth signal; if it is determined that the signal receiving device has sufficient bandwidth, do not compress and encode the fourth signal. Step 2: The judged and processed fourth signal is encapsulated into a fifth signal according to a private protocol. The private protocol specifies the frame start symbol, number of channels, data blocks for each channel, encoding method identifier, data length, check code, and frame end symbol of the data frame. Step 3: Transmit the fifth signal to the interconnected terminal via the USB interface.

7. The multi-mode switchable mobile sound card according to claim 6, characterized in that, Step 2 includes: The fourth signal, after being judged and processed, is encrypted using the AES-256 encryption algorithm. The key is generated through RSA-2048 digital signature negotiation during device pairing. The encrypted fourth signal is encapsulated according to a private protocol to form a fifth signal. The private protocol specifies the start-of-frame character, number of channels, data blocks for each channel, encoding method identifier, data length, checksum, and end-of-frame character of the data frame.

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