An audio receiving box for wireless and wired use

Abstract

The utility model discloses an audio receiving box for wireless and wired use, comprising a shell, a PCBA board, wherein the PCBA board is connected with an audio input terminal and an audio output terminal, and the PCBA board carries: an MCU, which performs analog-to-digital conversion on a wired microphone signal, mixes the signal with a wireless audio signal, and then performs digital-to-analog conversion; a wired audio input circuit, which transmits the wired microphone signal of the audio input terminal to an ADC inside the MCU; a wireless communication chip, which receives a wireless device signal and transmits the signal to the MCU through the wireless audio input circuit; outputs an analog signal processed by a DAC inside the MCU to a target player through the audio output terminal, performs analog-to-digital conversion on the wired microphone signal, mixes the signal with the wireless audio signal, and then performs digital-to-analog conversion to output the signal to a sound player, thereby solving the disadvantage of low audio quality in a traditional mixing method, and realizing that a sound player with a wired interface can receive, mix, and output single or multiple wireless device audios in addition to using a wired microphone, and is compact and portable, thereby enriching application scenarios.

Description

Technical Field

[0001] The utility model belongs to the field of audio equipment, and in particular relates to an audio receiving box shared by wireless and wired audio equipment. Background Art

[0002] At present, in scenes such as program hosting, wedding activities, conference activities, festival celebrations, concerts, etc., the host or spokesperson, actor, singer, single or multiple people use wired microphones and / or wireless microphones to output sound to the speakers. In order to enhance the atmosphere, existing audio files must be input to the speakers as background music. If the existing speakers only have a 6.35 female port, they can only be plugged in with wired microphones, but cannot be connected to wireless devices, and cannot receive wireless audio signals for synchronous output.

[0003] As more and more occasions require the simultaneous use of wireless and wired devices, the single access function of audio equipment brings many inconveniences and limitations.

[0004] In addition, the existing audio mixing method is to directly mix the analog signal collected by the wired microphone and the digital signal collected by the wireless device. For example, when a song file is used as background sound, it is easy to cause clipping overload and the output audio quality is not high. Utility Model Content

[0005] The problem to be solved by the utility model is to enable a speaker with only a wired interface to receive, mix and output audio of a single or multiple wireless devices in addition to using a wired microphone, and to ensure the output audio quality.

[0006] The technical solution adopted for the above technical problem is a wireless and wired audio receiving box, comprising a shell, a PCBA board is arranged in the shell, the PCBA board is connected with an audio input terminal and an audio output terminal exposed from the shell, wherein the PCBA board carries:

[0007] MCU, which performs analog-to-digital conversion on the wired microphone signal, mixes it with the wireless audio signal, and then performs digital-to-analog conversion;

[0008] A wired audio input circuit transmits the wired microphone signal of the audio input end to the ADC inside the MCU;

[0009] A wireless communication chip receives wireless device signals and transmits them to the MCU through the wireless audio input circuit on the PCBA board;

[0010] The audio output circuit outputs the analog signal processed by the DAC inside the MCU to the target player through the audio output terminal.

[0011] Furthermore, one end of the audio input terminal of the wired audio input circuit is grounded, and the other end of the resistor R10 is grounded for voltage division, and the resistor R11 is connected in series with the 19th pin AUXIN0 of the MCU.

[0012] Furthermore, the wireless audio input circuit resistor R3, capacitor C19 and pin TRX of the MCU are connected in series, the resistor R3 and capacitor C19 are connected in parallel to the ground resistor R4 and capacitor C21, and the capacitor C19 and pin TRX of the MCU are connected in parallel to the ground capacitor C20 and the electrostatic diode.

[0013] Furthermore, the 32nd pin AOUTR of the audio output circuit MCU is connected in series with a capacitor C7 and a resistor R6, and the chip varistor M5 is grounded; the 30th pin AOUTL of the MCU is connected in series with a capacitor C9 and a resistor R7, and the chip varistor M2 is grounded.

[0014] Optionally, the MCU's 36-pin PB4 is connected in series with a resistor R5 and a light-emitting diode LED1 to indicate the power status.

[0015] Optionally, the MCU's 38-pin PB2 is connected in series with a resistor R10 and a light-emitting diode LED2 to indicate the wireless device connection status.

[0016] Optionally, the audio output circuit uses a linear regulator (LDO) to provide a stable output voltage.

[0017] Optionally, a manual adjustment button connected to the PCBA board is provided outside the shell to manually adjust the mixing ratio of wireless and wired audio.

[0018] The wireless communication chip is any one of a WiFi module, a Bluetooth communication module, a 4G / 5G module, and a U-segment module.

[0019] A post-processing module is included, and the post-processing module is used to receive the audio signal transmitted by the wired audio input circuit and / or the wireless communication chip, and transmit the processed audio signal to the MCU.

[0020] The beneficial effects of the utility model are: through the wireless communication chip, wireless audio input circuit and MCU on the PCBA board, the audio system with only a wired interface can receive, mix and output single or multiple wireless device audio in addition to using a wired microphone, which is compact and portable and enriches the application scenarios. And through the wired audio input circuit on the PCBA board, the wired microphone audio is transmitted to the MCU and converted into a digital signal and then mixed with the wireless communication device audio signal, avoiding the disadvantage of low audio quality in the traditional mixing method and ensuring the quality of the output audio. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The utility model is a perspective view of an audio receiving box for wireless and wired use.

[0022] Figure 2 The utility model discloses an audio processing block diagram of an audio receiving box shared by wireless and wired audio.

[0023] Figure 3 The utility model discloses a wired audio input circuit principle diagram of an audio receiving box for wireless and wired use.

[0024] Figure 4 The utility model discloses a wireless audio input circuit principle diagram of an audio receiving box for wireless and wired use.

[0025] Figure 5 The utility model discloses an audio output circuit principle diagram of an audio receiving box shared by wireless and wired audio.

[0026] Figure 6 The utility model discloses an MCU circuit principle diagram of an audio receiving box shared by wireless and wired audio.

[0027] Reference numerals shown in the figure: 1. 6.35 audio plug; 2. battery box; 3. housing; 4. PCBA board; 5. 6.35 audio socket. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the utility model. It is understandable that the drawings are only provided for reference and illustration, and are not used to limit the utility model. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0029] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to another component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The terms used in this document in the specification of the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model.

[0030] It should also be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] Please refer to Figure 1 The housing 3 is provided with a PCBA board 4. In some embodiments, the audio input end of the PCBA board 4 exposed from the housing is a 6.35 audio mother socket 5, and the audio output end is a 6.35 audio plug 1. The audio receiving box can be optionally provided with a battery box 2; the 6.35 audio plug 1 is located at the front end of the housing 3, and the 6.35 audio mother socket 5 and the battery box 2 are located at the rear end; the battery box 2 supplies power to the PCBA board 4.

[0033] Please refer to Figure 2, PCBA board 4 has an onboard MCU, which performs analog-to-digital conversion, mixing processing and digital-to-analog conversion of the input audio; the onboard wired audio input circuit transmits the analog signal of the wired microphone to the ADC inside the MCU for sampling, holding, quantization, and encoding processing to obtain a digital signal; the onboard wireless communication chip receives the wireless device signal; the onboard wireless audio input circuit transmits the analog signal of the wireless device to the MCU; the onboard audio output circuit outputs the analog signal processed by the DAC in the MCU through the 6.35 audio plug 1 extending out of the shell 3 to the target player, such as a speaker, for amplification. The MCU algorithm program automatically analyzes and adjusts the mixing ratio, and performs mixing processing on the wired microphone and wireless device audio. In some embodiments, the post-processing module is an independent module, or it can be integrated in the MCU. Before mixing, the post-processing module separately processes the wired microphone signal and the wireless audio signal, and then transmits them to the MCU, which then processes and mixes them. The post-processing module can post-process the input audio signal by one or more of the following processes: equalizer, dynamic range control, equal loudness, 3D surround sound, voice change, echo cancellation, automatic gain compensation, and background noise suppression.

[0034] Wireless devices such as mobile phones, electronic musical instruments, wireless microphones, etc., wireless communication chips receive audio signals sent by them. The wireless communication chip can be any one of Bluetooth, Wifi and U-band, 4G / 5G modules or a combination of these modules.

[0035] Please refer to Figure 3-6 The circuit schematic diagram shows that the wired microphone signal enters the MCU through the 6.35 audio mother socket 5, resistor R10, and resistor R11 for voltage division, and is sampled, held, quantized, and encoded by the ADC inside the MCU; one end of the 6.35 audio mother socket 5 is grounded, and the other end resistor R10 is grounded for voltage division, and the resistor R11 is connected in series with the 19-pin AUXIN0 of the MCU.

[0036] The wireless communication chip receives the wireless device signal and enters the MCU through the wireless audio input circuit; the wireless audio input circuit resistor R3, capacitor C19 and pin 1 TRX of the MCU are connected in series, the resistor R3 and capacitor C19 are connected in parallel to the ground resistor R4 and capacitor C21, and the capacitor C19 and pin 1 TRX of the MCU are connected in parallel to the ground capacitor C20 and the electrostatic diode M1.

[0037] The audio output circuit amplifies the audio processed by the MCU and then outputs it. The 32-pin AOUTR of the MCU is connected in series with capacitor C7 and resistor R6, and the chip varistor M5 is grounded. The 30-pin AOUTL of the MCU is connected in series with capacitor C9 and resistor R7, and the chip varistor M2 is grounded. The linear regulator (LDO) provides a stable voltage.

[0038] The 36-pin PB4 of the MCU is connected in series with a resistor R5 and a light-emitting diode LED1, and the MCU controls the LED light to indicate the power status; the 38-pin PB2 of the MCU is connected in series with a resistor R10 and a light-emitting diode LED2, and the MCU controls the LED light to indicate the connection status of the wireless device.

[0039] The housing 3 is also provided with a manual adjustment button (not shown) connected to the PCBA board 4. The MCU combines the built-in algorithm program to automatically analyze and adjust the audio mixing ratio. The user can also operate the adjustment button for manual custom adjustment. The algorithm program belongs to the technology of software methods and is not the focus of innovation of this application, so it will not be repeated here.

[0040] In the specification and claims of the present application, the words "include / comprise" and the words "have / include" and their variations are used to specify the existence of stated features, values, steps or components, but do not exclude the existence or addition of one or more other features, values, steps, components or combinations thereof.

[0041] Some features of the present invention are described in different embodiments for clarity of description, however, these features may also be described in combination in a single embodiment. Conversely, some features of the present invention are described in a single embodiment for brevity, however, these features may also be described in different embodiments alone or in any suitable combination.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wireless and wired audio receiving box, comprising a housing, a PCBA board disposed in the housing, the PCBA board being connected with an audio input terminal and an audio output terminal exposed from the housing, characterized in that: The PCBA board has: MCU, which performs analog-to-digital conversion on the wired microphone signal, mixes it with the wireless audio signal, and then performs digital-to-analog conversion; A wired audio input circuit transmits the wired microphone signal of the audio input end to the ADC inside the MCU; A wireless communication chip receives wireless device signals and transmits them to the MCU through the wireless audio input circuit on the PCBA board; The audio output circuit outputs the analog signal processed by the DAC inside the MCU to the target player through the audio output terminal.

2. The wireless and wired audio receiving box according to claim 1, characterized in that: One end of the audio input terminal of the wired audio input circuit is grounded, and the other end resistor R10 is grounded for voltage division, and the resistor R11 is connected in series with the 19th pin AUXIN0 of the MCU.

3. The wireless and wired audio receiving box according to claim 1, characterized in that: The resistor R3 and capacitor C19 of the wireless audio input circuit are connected in series with pin TRX 1 of the MCU, the resistor R4 and capacitor C21 are connected in parallel between the resistor R3 and the capacitor C19, and the capacitor C20 and the electrostatic diode are connected in parallel between the capacitor C19 and pin TRX 1 of the MCU.

4. The wireless and wired audio receiving box according to claim 1, characterized in that: The 32nd pin AOUTR of the audio output circuit MCU is connected in series with a capacitor C7 and a resistor R6, and the chip varistor M5 is grounded. The 30th pin AOUTL of the MCU is connected in series with a capacitor C9 and a resistor R7, and the chip varistor M2 is grounded.

5. A wireless and wired audio receiving box according to any one of claims 1 to 4, characterized in that: The 36-pin PB4 of the MCU is connected in series with a resistor R5 and a light-emitting diode LED1 to indicate the power status.

6. A wireless and wired audio receiving box according to any one of claims 1 to 4, characterized in that: The 38-pin PB2 of the MCU is connected in series with a resistor R10 and a light-emitting diode LED2 to indicate the connection status of the wireless device.

7. A wireless and wired audio receiving box according to any one of claims 1 to 4, characterized in that: The audio output circuit uses a linear regulator (LDO) to provide a stable output voltage.

8. A wireless and wired audio receiving box according to any one of claims 1 to 4, characterized in that: A manual adjustment button connected to the PCBA board is also provided outside the shell to receive manual control and is used to adjust the mixing ratio of wireless and wired audio.

9. A wireless and wired audio receiving box according to any one of claims 1 to 4, characterized in that: The wireless communication chip is any one of a WiFi module, a Bluetooth communication module, a 4G / 5G module, and a U-segment module.

10. The wireless and wired audio receiving box according to any one of claims 1 to 4, characterized in that: A post-processing module is included, and the post-processing module is used to receive the audio signal transmitted by the wired audio input circuit and / or the wireless communication chip, and transmit the processed audio signal to the MCU.

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