Digital audio playing platform

Abstract

The utility model provides a digital audio playing platform, which comprises a master control module, a digital audio processing module, a digital audio playing module, a digital audio playing module and a digital audio playing module, the digital audio processing module is used for decoding, sampling, format conversion and data processing of digital audio files; the digital audio output module is used for outputting digital audio data in corresponding formats through a plurality of digital audio output channels; the left sound channel audio circuit module and the right sound channel audio circuit module are two independent working modules with consistent circuit structures, are respectively used for conversion, adjustment and gain control of audio signals in a left sound channel and a right sound channel, and output multiple paths of analog audio signals to the analog audio output module; and the analog audio output module is used for realizing balanced and single-ended double-channel earphone output. According to the utility model, by designing the circuit module and adopting high-performance devices, the effects of lossless high-fidelity tone quality, abundant audio output interfaces, multi-tone selection and more convenient operation mode are achieved.

Description

Technical Field

[0001] The utility model relates to the field of audio playback devices, and particularly relates to a digital audio playback platform. Background Art

[0002] With the progress of electronic information technology and the popularization of digital music technology, in order to meet the needs of the majority of music lovers, music players are constantly improving in terms of functions and sound quality. However, the sound quality of most existing music players still cannot reach the high-fidelity standard, so it cannot meet the needs of users who pursue high-quality audio experience; secondly, the timbre of existing music players is relatively monotonous and cannot meet different listening needs; in addition, the analog audio output of existing music players is relatively single and cannot meet the performance of high-quality headphones; in addition, the function operations of existing music players are often only achieved through buttons and can no longer meet people's needs for convenient operations.

[0003] Therefore, a digital audio playback platform that can provide lossless high-fidelity sound quality, rich audio output interfaces, multiple timbre selections, and convenient operation methods is needed. Summary of the Utility Model

[0004] A digital audio playback platform provided by the utility model is mainly used to solve problems such as poor sound quality, single audio output interface and timbre, and poor convenience of existing music players, so as to achieve the effects of providing lossless high-fidelity sound quality, rich audio output interfaces, multiple timbre selections, and more convenient operation methods.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A digital audio playback platform includes a main control module, a digital audio processing module, a digital audio output module, a left-channel audio circuit module, a right-channel audio circuit module, an analog audio output module, and a power supply module for power supply. The main control module establishes a data connection with the digital audio processing module and is used for the transmission of digital audio files in PCM and DSD formats; the digital audio processing module is used for decoding, sampling, format conversion, and data processing of the digital audio files, and outputs digital audio data to the digital audio output module, the left-channel audio circuit module, and the right-channel audio circuit module respectively; the digital audio output module is used for outputting the digital audio data in corresponding formats through multiple digital audio output channels; the left-channel audio circuit module and the right-channel audio circuit module are two independent working modules with the same circuit structure, which are respectively used for the conversion, adjustment, and gain control of audio signals in the left and right channels, and output multiple paths of analog audio signals to the analog audio output module. The analog audio output module is configured with multiple analog audio output ports for realizing balanced and single-ended dual-channel headphone output.

[0007] A further solution is that the main control module uses a Snapdragon 665 processor chip, which is built-in with 8 + 256GB uMCP and is equipped with a TF card slot to support SD card expansion for storing the digital audio files.

[0008] A further solution is that the digital audio processing module uses an FPGA board developed based on the GW1N-LV9 chip. The FPGA board is configured with HDMI output, LVDS output, supports multiple power supply options, and its bandwidth meets the processing of audio data with output formats of PCM44 - 768K and DSD64 - 512.

[0009] A further solution is that the digital audio output module includes an LVDS high-speed differential line driver and a digital audio output interface module. The LVDS high-speed differential line driver supports a data rate exceeding 400Mbps for high-speed transmission of the digital audio data. The digital audio output interface module includes a mini HDMI port and a Type-C port. Through the mini HDMI port, the output of I 2 S / DSD channel digital audio is realized, and through the Type-C port, the output of S / PDIF channel coaxial digital audio and the output of USB Audio digital audio are realized.

[0010] A further solution is that the I 2 S / DSD channel supports the output of digital audio in PCM 768kHz format and DSD 512 format at most, and the S / PDIF channel supports the output of digital audio in PCM 192kHz format and DSD 64 format encapsulated by DOP at most.

[0011] A further solution is that it further includes a clock module. The clock module uses two femtosecond-level active crystal oscillators as clock crystal sources. The two active crystal oscillators are supplied with an independent power supply by the power supply module and generate two clock signals to be output to the FPGA board.

[0012] A further solution is that both the left-channel audio circuit module and the right-channel audio circuit module include a signal processing circuit, a multi-timbre circuit, and a gain control circuit. The signal processing circuit is used to convert the digital audio data into the analog audio signal. The multi-timbre circuit is used to obtain timbres with different listening sensations by adjusting the analog audio signal. The gain control circuit is used for volume and audio gain adjustment.

[0013] A further solution is that the gain control circuit uses a volume control IC with the model number MUSES72320V, which is controlled by a three-wire serial bus and is used to achieve synchronous control of the full balance and full channels.

[0014] A further solution is that the analog audio output module is configured with four analog audio output ports, namely 1 3.5mm single-ended PO, 1 3.5mm single-ended LO / PRE, 1 4.4mm balanced PO, and 1 4.4mm balanced LO / PRE, which are used to implement 4.4BAL balanced output and 3.5PO standard output.

[0015] A further solution is that it further includes a peripheral module connected to the main control module. The peripheral module includes an antenna, a power measurement IC, a touch display screen, and buttons. The antenna is used to enhance the wireless network signal for WIFI / BT communication. The power measurement IC is used to measure the power consumption of the device. The touch screen and buttons are used for human-computer interaction operations.

[0016] Thus, the present utility model has the following beneficial effects:

[0017] 1. The present utility model adopts a Qualcomm Snapdragon 665 main control platform combined with a high-performance FPGA digital audio processor, which can realize the playback of audio files in the highest PCM 768kHz and DSD 512 formats. Compared with existing music players, it has high-bandwidth modulation and strong anti-interference capabilities, can greatly improve the transmission stability and anti-interference ability, and achieve higher-quality data transmission. The use of a high-performance FPGA digital audio processor can keep the audio data in its original quality during the encoding and decoding processes to achieve original code playback and output. In addition, low-noise and high-efficiency components are used in various circuits for signal processing and transmission to further optimize the circuit and reduce interference, avoiding signal jitter, noise, and distortion. Thus, it can be seen that the present utility model can provide lossless and high-fidelity high-quality audio to meet the demand for high-quality sound quality.

[0018] 2. The present utility model is configured with digital audio interfaces such as I2S / DSD, USB DAC Input / Output, and S / Pdif. Compared with existing music players, it has rich audio output interfaces, supports the output of multi-channel audio files, and has the advantages of high sound quality, low noise, low distortion, and good compatibility.

[0019] 3. The present utility model is configured with a total of four analog audio output interfaces, namely 3.5LO / PRE, 4.4LO / PRE, 3.5PO, and 4.4PO, to achieve balanced and single-ended dual-channel headphone output. Compared with existing music players that only have single-ended output, the balanced output can reduce crosstalk between channels, improve signal purity, and enhance driving ability, thereby improving sound quality and enhancing headphone performance.

[0020] 4. The utility model adopts a multi-timbre circuit, which can provide classic tube timbre, modern tube timbre and transistor timbre styles for users to choose from, so as to meet different listening needs and bring a high-quality music experience.

[0021] 5. The utility model has rich peripheral function modules. Compared with the human-computer operation of existing music players, in addition to the traditional button operation, it can perform multi-touch, double-click wake-up and global gesture touch through a touch display screen. In addition, it can also realize global touch remote control on the mobile phone or Pad side by connecting to WiFi, achieving convenient operation.

[0022] The following further elaborates on the utility model in detail in conjunction with the attached drawings and specific implementation manners. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the digital audio playback platform according to the embodiment of the utility model. Specific Implementation Manner

[0024] To make the objectives, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions of the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are some but not all of the embodiments of the utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the utility model without creative efforts shall fall within the scope of protection of the utility model.

[0025] An Embodiment of a Digital Audio Playback Platform

[0026] See Figure 1, a digital audio playback platform related to the present utility model includes a main control module 10, a digital audio processing module 20, a digital audio output module 30, a left-channel audio circuit module 40, a right-channel audio circuit module 50, an analog audio output module 60, and a power supply module 70 for power supply. The main control module 10 establishes a data connection with the digital audio processing module 20 for the transmission of digital audio files in PCM and DSD formats; the digital audio processing module 20 is used for decoding, sampling, format conversion, and data processing of the digital audio files, and outputs digital audio data to the digital audio output module 30, the left-channel audio circuit module 40, and the right-channel audio circuit module 50 respectively; the digital audio output module 30 is used for outputting the digital audio data in the corresponding format through multiple digital audio output channels; the left-channel audio circuit module 40 and the right-channel audio circuit module 50 are two independent working modules with the same circuit structure, which are respectively used for the conversion, adjustment, and gain control of audio signals in the left and right channels, and output multiple analog audio signals to the analog audio output module 60. The analog audio output module 60 is configured with multiple analog audio output ports for realizing balanced and single-ended dual-channel headphone output.

[0027] Specifically, this embodiment further includes a USB interface module 11. The USB interface module 11 establishes data connections with the main control module 10 and the digital audio processing module 20 respectively. It includes a USB DAC Input interface and a USB DAC Output interface, and realizes the input and output of digital audio through the DAC Input interface and the USB DAC Output interface respectively.

[0028] Specifically, the USB interface module 11 of this embodiment includes a Type-C interface, and the power supply module 70 realizes power charging through the Type-C interface.

[0029] In this embodiment, the main control module 10 uses a Snapdragon 665 processor chip, which is built-in with 8 + 256GB uMCP and is equipped with a TF card slot 98 to support SD card expansion for storing the digital audio files.

[0030] In this embodiment, the digital audio processing module 20 uses an FPGA board developed based on the GW1N-LV9 chip. The FPGA board is configured with HDMI output and LVDS output, supports multiple power supply options, and its bandwidth meets the processing of audio data with output formats of PCM44 - 768K and DSD64 - 512.

[0031] Specifically, in this embodiment, PCM44-768K means that the sampling rate of audio data is 768K, the sampling bit depth is 44 bits, and the sampling format is PCM. DSD64-512 means that the sampling rate of audio data is 512K, the sampling bit depth is 64 bits, and the sampling format is DSD.

[0032] In this embodiment, the digital audio output module 30 includes an LVDS high-speed differential line driver 31 and a digital audio output interface module 32. The LVDS high-speed differential line driver 31 supports a data rate exceeding 400 Mbps and is used for the high-speed transmission of the digital audio data. The digital audio output interface module 32 includes a mini HDMI port and a Type-C port. The I 2 S / DSD channel digital audio output is realized through the mini HDMI port, and the S / PDIF channel coaxial digital audio output and USB Audio digital audio output are realized through the Type-C port.

[0033] In this embodiment, the I 2 S / DSD channel supports a maximum output of digital audio in PCM 768kHz format and DSD 512 format. The S / PDIF channel supports a maximum output of digital audio in PCM 192kHz format and DSD 64 format encapsulated by DOP.

[0034] Specifically, this embodiment has a built-in DTA engine that bypasses the SRC resampling system of the Android system globally to achieve original code playback and output.

[0035] It can be seen that by adopting DTA technology, the SRC problem, that is, the non-integer multiple sampling rate conversion problem, can be bypassed from the system bottom layer, so as to achieve the original code rate output.

[0036] In this embodiment, it further includes a clock module 80. The clock module 80 uses two femtosecond-level active crystal oscillators as clock crystal sources. The two active crystal oscillators are powered by an independent power supply provided by the power module 70 and generate two clock signals for output to the FPGA board.

[0037] Specifically, the active crystal oscillators in this embodiment adopt Accusilicon AS318 or CRYSTEK CCHD-575 series femtosecond-level ultra-low phase noise and ultra-low jitter active crystal oscillators, and by precisely designing the clock signal path, the clock jitter is reduced to ensure the transmission quality of the clock signal.

[0038] In this embodiment, both the left-channel audio circuit module 40 and the right-channel audio circuit module 50 include a signal processing circuit, a multi-timbre circuit, and a gain control circuit. The signal processing circuit is used to convert the digital audio data into the analog audio signal. The multi-timbre circuit is used to obtain timbres with different listening sensations by adjusting the analog audio signal. The gain control circuit is used for volume and audio gain adjustment.

[0039] Specifically, the signal processing circuit in this embodiment includes a digital-to-analog conversion circuit, an IV conversion circuit, and an LPF circuit. The digital-to-analog conversion circuit is used to convert the digital audio data into the analog audio signal. The IV conversion circuit is used to convert the current signal output by the digital-to-analog conversion circuit into a voltage signal for output. The LPF circuit is used to filter the voltage signal.

[0040] Specifically, the multi-timbre circuit in this embodiment includes a classic vacuum tube timbre circuit, a modern vacuum tube timbre circuit, and a transistor timbre circuit. The above three timbre circuits can respectively provide classic vacuum tube timbre, modern vacuum tube timbre, and transistor timbre styles for users to choose from, so as to meet different listening needs and bring a high-quality music experience.

[0041] In this embodiment, the gain control circuit uses a volume control IC with the model number MUSES72320V, which is controlled by a three-wire serial bus and is used to achieve synchronous control of the full balance and full channels.

[0042] Specifically, the MUSES72320V volume control IC in this embodiment has the characteristics of high sound quality, low distortion, and low noise. By using two MUSES72320V volume control ICs to control the volume and gain of four channels, high-performance volume control is provided, and a high-quality audio experience is provided.

[0043] In this embodiment, the analog audio output module 60 is configured with four analog audio output ports, which are respectively 1 3.5mm single-ended PO, 1 3.5mm single-ended LO / PRE, 1 4.4mm balanced PO, and 1 4.4mm balanced LO / PRE, and are used to achieve 4.4BAL balanced output and 3.5PO standard output.

[0044] Specifically, the 3.5mm single-ended PO in this embodiment is compatible with headphones that conform to the OMTP and CTIA standards.

[0045] In this embodiment, it further includes a peripheral module 90 connected to the main control module 10. The peripheral module 90 includes an antenna 91, a power measurement IC 93, a touch display screen 95, and buttons 96. The antenna 91 is used to enhance the wireless network signal for WIFI / BT communication. The power measurement IC 93 is used to measure the power consumption of the device. The touch display screen 95 and the buttons 96 are used for human-computer interaction to implement corresponding functions.

[0046] Specifically, this embodiment uses a 2.4G + 5.0GHz dual-band antenna, which allows the device to support both the 2.4GHz band and the 5GHz band simultaneously, and can automatically select the best band according to the usage scenario, thus providing a better user experience.

[0047] Among them, the frequency range of the 2.4GHz band is usually 2.4000 - 2.4835GHz. It has a long transmission distance and can provide a good coverage range. However, due to its relatively low frequency, it is more susceptible to interference from other wireless devices. The frequency range of the 5GHz band is usually between 5.150 - 5.850GHz. It has a fast transmission speed, relatively less interference, and can provide a faster data transmission rate. However, its coverage range is relatively small and is suitable for use within a short distance.

[0048] Specifically, this embodiment uses a dedicated antenna with a metal frame design. It uses the same material and processing technology as the device's casing. While achieving a beautiful appearance design, it has the characteristic of high gain, which can make the emitted signal more concentrated, reduce signal scattering and interference, and thus improve the clarity and reliability of the signal.

[0049] Specifically, this embodiment supports the Bluetooth V5.0 function, supports the dual-mode function of receiving + sending, that is, the dual-mode function of decoding + encoding, and supports codec formats with the highest current resolution specifications such as UAT, LDAC, AAC, and SBC. Bluetooth transmission also additionally supports Qualcomm's aptX and aptX HD high-resolution encoding formats.

[0050] Specifically, this embodiment supports the Wi-Fi function and allows the installation and use of third-party Apps. For example, this embodiment supports using the HibyCast software on iOS and Android clients to achieve global touch remote control on the mobile phone or Pad through Wi-Fi.

[0051] Specifically, the touch display screen 95 in this embodiment uses a 6.0-inch incell TFT touch screen and an FHD+ full high-definition screen with a resolution of 1080x2160. It supports multi-touch, double-tap wake-up, and global gesture touch.

[0052] Specifically, the button 96 in this embodiment includes a power button, a NEXT button, a PREV button, and a play / pause button. Short pressing or long pressing the above buttons respectively realizes functions such as turning the screen on / off or powering on / off, switching to the next song or fast forwarding, switching to the previous song or rewinding, and play / pause.

[0053] Specifically, the peripheral module 90 in this embodiment further includes a volume knob 97, and the user can customize its rotation direction according to their habits. Among them, gradually rotating the volume knob 97 realizes gradual addition and subtraction of the PO / PRE volume, and both are configured with the same volume value and gain value; quickly rotating the volume knob 97 realizes rapid adjustment of the PO / PRE volume.

[0054] Specifically, the PO / PRE in this embodiment has three adjustable gain levels: high / middle / low, and these three adjustable volume levels are effective for both 3.5 and 4.4 PO / PRE.

[0055] Specifically, a status display light-emitting ring is arranged below the volume knob 97 in this embodiment. The status display light-emitting ring is internally provided with a status display lamp 94, and the status display lamp 94 is used to display the format status, sampling rate, and charging status.

[0056] Among them, the status display lamp 94 adopts an RGB+W four-color LED backlight, and the user can choose to turn on or off this backlight. By precisely controlling the combined use of the RGB LED and the WLED, more delicate color transitions and higher brightness control can be achieved, thereby enhancing the overall visual effect and user experience.

[0057] Specifically, the peripheral module 90 in this embodiment further includes a gravity sensor 92. The gravity sensor 92 is used to measure and analyze the tilt, shake, and movement states of the device by detecting the magnitude and direction of the gravitational acceleration received by the device, so as to realize functions such as automatic screen rotation and shaking to change songs through gravity sensing. This not only improves the user experience but also increases the versatility of the device.

[0058] The above embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A digital audio playback platform, characterized in that: include: A main control module, a digital audio processing module, a digital audio output module, a left channel audio circuit module, a right channel audio circuit module, an analog audio output module and a power supply module for power supply, wherein the main control module establishes a data connection with the digital audio processing module for transmitting digital audio files in PCM and DSD formats; the digital audio processing module is used for decoding, sampling, format conversion and data processing of the digital audio files, and outputs digital audio data to the digital audio output module, the left channel audio circuit module and the right channel audio circuit module respectively; the digital audio output module is used to output the digital audio data in the corresponding format through multiple digital audio output channels; the left channel audio circuit module and the right channel audio circuit module are two independent working modules with the same circuit structure, which are respectively used for conversion, adjustment and gain control of audio signals in the left and right channels, and output multi-channel analog audio signals to the analog audio output module, and the analog audio output module is configured with multiple analog audio output ports for realizing balanced and single-ended two-way headphone output.

2. The digital audio playback platform according to claim 1, characterized in that: The main control module adopts the Snapdragon 665 processor chip, has a built-in 8+256GB uMCP, and is equipped with a TF card slot to support SD card expansion for the storage of the digital audio files.

3. The digital audio playback platform according to claim 1, characterized in that: The digital audio processing module adopts an FPGA board developed based on the GW1N-LV9 chip. The FPGA board is configured with HDMI output, LVDS output, and supports multiple power supply options. Its bandwidth meets the processing of audio data with output formats of PCM44-768K and DSD64-512.

4. The digital audio playback platform according to claim 3, characterized in that: The digital audio output module includes an LVDS high-speed differential line driver and a digital audio output interface module. The LVDS high-speed differential line driver supports a data rate exceeding 400Mbps and is used for high-speed transmission of the digital audio data. The digital audio output interface module includes a mini HDMI port and a Type-C port. I 2 The output of S / DSD channel digital audio realizes the output of S / PDIF channel coaxial digital audio and USB Audio digital audio through the Type-C port.

5. The digital audio playback platform according to claim 4, characterized in that: I 2 The S / DSD channel supports the output of digital audio in the formats of PCM 768kHz and DSD 512 at the highest, and the S / PDIF channel supports the output of digital audio in the formats of PCM 192kHz and DSD 64 via DOP encapsulation at the highest.

6. The digital audio playback platform according to claim 3, characterized in that: It also includes a clock module, which uses two femtosecond active crystal oscillators as clock crystal oscillator sources. The two active crystal oscillators are powered by an independent power supply provided by the power module, and generate two clock signals to be output to the FPGA board.

7. The digital audio playback platform according to claim 1, characterized in that: The left channel audio circuit module and the right channel audio circuit module both include a signal processing circuit, a multi-timbre circuit and a gain control circuit. The signal processing circuit is used to convert the digital audio data into the analog audio signal. The multi-timbre circuit is used to obtain timbres with different auditory senses by adjusting the analog audio signal. The gain control circuit is used to adjust the volume and audio gain.

8. The digital audio playback platform according to claim 7, characterized in that: The gain control circuit adopts a volume control IC of model MUSES72320V, which is controlled by a three-wire serial bus to achieve full-balance full-channel synchronous control.

9. The digital audio playback platform according to claim 1, characterized in that: The analog audio output module is equipped with four analog audio output ports, namely, 1 3.5mm single-ended PO, 1 3.5mm single-ended LO / PRE, 1 4.4mm balanced PO and 1 4.4mm balanced LO / PRE, for realizing 4.4BAL balanced output and 3.5PO standard output.

10. The digital audio playback platform according to claim 2, characterized in that: It also includes a peripheral module connected to the main control module, and the peripheral module includes an antenna, a power metering IC, a touch screen and buttons. The antenna is used to enhance the wireless network signal of WIFI / BT communication, the power metering IC is used to measure the power consumption of the equipment, and the touch screen and buttons are used for human-computer interaction.

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