Audio mainboard control circuit

Abstract

The utility model discloses an audio mainboard control circuit. Comprising a control logic circuit for controlling and monitoring an audio mainboard, an audio decoding circuit for converting a digital audio signal into an analog signal, a digital signal processing circuit for carrying out noise suppression and echo cancellation on the digital audio signal, and an audio power amplification circuit for amplifying a low-level analog audio signal into a high-level analog audio signal, the microphone pre-amplification circuit is used for amplifying weak microphone signals, and the power supply management circuit is used for providing a stable power supply for the audio mainboard; through the design of the audio decoding circuit, the digital signal processing circuit, the audio power amplification circuit and the microphone pre-amplification circuit, accurate conversion and high-efficiency processing of audio signals can be realized, so that excellent tone quality is provided, various complex audio processing algorithms can be executed, the definition and audibility of audio are improved, and the sound quality is improved. And meanwhile, background noise and interference are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of audio signal control and processing, in particular to an audio mainboard control circuit. Background Art

[0002] The audio motherboard control circuit refers to the circuit used to control and process audio signals on the audio motherboard, which includes multiple parts, such as audio input interface, audio processing chip, amplifier, audio output interface, etc. The audio input interface is used to receive external audio signals, such as input from microphones, music players, etc. The audio processing chip is responsible for processing and decoding the audio signal to make it meet the audio output standards. During the processing, it may perform noise reduction, equalization, mixing and other operations to improve the sound quality and effect. The amplifier is an important part of the audio motherboard control circuit. It will amplify the processed signal to an appropriate volume in order to drive the speaker or headphone output. At the same time, the audio output interface provides an interface for connecting audio devices such as speakers and headphones to achieve the output of audio signals.

[0003] After searching, the patent with application number CN201310540262.2 discloses an audio signal control circuit, a first control circuit, used to collect an analog audio signal in an audio signal and convert the analog audio signal into a first control signal; a first switch circuit is controlled to be turned on by the first control signal, and an analog signal encoding and decoding module is turned on to receive the analog audio signal; a second control circuit is used to collect a digital audio signal in an audio signal and convert the digital audio signal into a second control signal; and a second switch circuit is controlled to be turned on by the second control signal, and a digital encoding and decoding module is turned on to receive the digital audio signal.

[0004] The audio motherboard control circuit of the prior art is not accurate enough in converting audio signals and is not efficient enough in processing, resulting in poor output sound quality. In addition, the optimization of audio signals is not comprehensive enough, which reduces the clarity and fidelity of the audio. Therefore, we need to propose an audio motherboard control circuit. Utility Model Content

[0005] The purpose of the utility model is to provide an audio mainboard control circuit, which can realize accurate conversion and efficient processing of audio signals through the design of audio decoding circuit, digital signal processing circuit, audio power amplifier circuit and microphone preamplifier circuit, so as to provide excellent sound quality, and can execute a variety of complex audio processing algorithms to improve the clarity and audibility of audio, while eliminating background noise and interference, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an audio mainboard control circuit, comprising a control logic circuit for controlling and monitoring the audio mainboard, an audio decoding circuit for converting a digital audio signal into an analog signal, a digital signal processing circuit for performing noise suppression and echo elimination on the digital audio signal, an audio power amplifier circuit for amplifying a low-level analog audio signal into a high-level analog audio signal, a microphone preamplifier circuit for amplifying a weak microphone signal, and a power management circuit for providing a stable power supply for the audio mainboard; the audio decoding circuit, the digital signal processing circuit, the audio power amplifier circuit, the microphone preamplifier circuit and the power management circuit are all electrically connected to the control logic circuit.

[0007] Preferably, the control logic circuit includes a chip U1, and pins 1 and 3 of the chip U1 are respectively connected to grounded resistors R3 and R4, pins 7 and 8 of the chip U1 are connected to grounded capacitors C1, and capacitors C2 and C3 arranged in parallel are connected between pins 11 and 12 of the chip U1.

[0008] Preferably, the audio decoding circuit includes a chip U11, a chip U2, a chip U4 and a crystal oscillator Y1, the pin 3 of the chip U1 is connected to the pin 6 of the chip U2, the pin 4 of the chip U1 is connected to the pin 5 of the chip U2, and the capacitor C35, the capacitor C4 and the capacitor C34 arranged in parallel are connected between the pin 2 and the pin 3 of the chip U2;

[0009] Pin 1 of the chip U4 is connected to pin 7 of the chip U2, pin 2 of the chip U4 is connected to pin 21 of the chip U2, pin 5 of the chip U4 is connected to pin 19 of the chip U2, pin 6 of the chip U4 is connected to pin 20 of the chip U2, pin 1 of the crystal oscillator Y1 is connected to pin 15 of the chip U2 and is connected to capacitor C9, and pin 3 of the crystal oscillator Y1 is connected to pin 16 of the chip U2 and is connected to capacitor C10.

[0010] Preferably, the digital signal processing circuit includes a chip U41, a resistor R178 is connected between pins 3 and 4 of the chip U41, capacitors CT17 and CT20 arranged in parallel are connected to pins 5 and 6 of the chip U41, a resistor R148 is connected to pin 10 of the chip U41, a capacitor C108 is connected to pin 12 of the chip U41, and one end of the resistor R148 and the capacitor C108 are both connected to pin 9 of the chip U41 and grounded;

[0011] Capacitors CT15 and CT19 arranged in parallel are connected to the connection terminals of pins 17, 18 and 19 of the chip U41, a resistor R153 is connected between pins 25 and 24 of the chip U41, and resistor R154 and capacitor CT18 are connected to both ends of the resistor R153, respectively.

[0012] Preferably, the audio power amplifier circuit includes an amplifier U10, a terminal CN1, a terminal CN2, and a terminal CN3, a resistor R22 and a resistor R44 are connected between pin 1 and pin 5 of the amplifier U10, a capacitor C33 and a resistor R33 are connected to the wiring terminals of the resistor R22 and the resistor R44, a capacitor C44 is connected to pin 1 of the amplifier U10, and a grounded resistor R55 is connected between pin 1 of the terminal CN2 and the capacitor C44;

[0013] A resistor R88 is connected between pins 2 and 3 of the amplifier U10, a resistor R77 and a capacitor C66 are connected to pin 2 of the amplifier U10 in sequence, a capacitor C55 is connected between pin 4 of the amplifier U10 and pin 1 of the connection terminal CN3, and a resistor R66 and a capacitor C77 are connected to pin 4 of the amplifier U10 in sequence.

[0014] Preferably, the microphone preamplifier circuit includes a microphone MIC and a transistor Q2, a capacitor C50 is connected between pin 1 of the microphone MIC and the base of the transistor Q2, a resistor R230 is connected between the base and the collector of the transistor Q2, a resistor R240 and a resistor R220 are connected in series at both ends of the resistor R230 in parallel, and one end of the resistor R230 and one end of the resistor R220 are respectively connected to the two ends of the capacitor C50; a capacitor C60 is connected to the collector of the transistor Q2, and a grounded resistor R260 is connected to the emitter of the transistor Q2.

[0015] Preferably, the power management circuit includes a chip U20, and capacitors C71 and C61 are connected to pins 5 and 6 of the chip U20 in parallel, a capacitor C101 is connected between pins 10 and 11 of the chip U20, a resistor R81 and a light-emitting diode LED are connected in series at both ends of the capacitor C101, a resistor R91, a capacitor C91 and a capacitor C81 are connected in parallel between pins 24 and 25 of the chip U20, and a resistor R101 is connected between the resistor R91 and the capacitor C91; and capacitors C111, C121, C131 and C141 are connected to pin 17 of the chip U20 in parallel.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model can realize accurate conversion and efficient processing of audio signals through the design of audio decoding circuit, digital signal processing circuit, audio power amplifier circuit and microphone preamplifier circuit, thereby providing excellent sound quality, and can execute a variety of complex audio processing algorithms to improve audio clarity and audibility, while eliminating background noise and interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The circuit diagram of the control logic circuit of the utility model;

[0019] Figure 2 The circuit diagram of the audio decoding circuit of the utility model;

[0020] Figure 3 A circuit diagram of a digital signal processing circuit of the utility model;

[0021] Figure 4 The circuit diagram of the audio power amplifier circuit of the utility model;

[0022] Figure 5 The circuit diagram of the microphone preamplifier circuit of the utility model;

[0023] Figure 6 This is a circuit diagram of the power management circuit of the utility model. DETAILED DESCRIPTION

[0024] 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 in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-6 The utility model provides a technical solution: an audio mainboard control circuit, including a control logic circuit for controlling and monitoring the audio mainboard, an audio decoding circuit for converting a digital audio signal into an analog signal, a digital signal processing circuit for performing noise suppression and echo elimination on the digital audio signal, an audio power amplifier circuit for amplifying a low-level analog audio signal into a high-level analog audio signal, a microphone preamplifier circuit for amplifying a weak microphone signal, and a power management circuit for providing a stable power supply for the audio mainboard; the audio decoding circuit, the digital signal processing circuit, the audio power amplifier circuit, the microphone preamplifier circuit and the power management circuit are all electrically connected to the control logic circuit.

[0026] Audio decoding circuit; responsible for converting digital audio signals into analog signals to drive the speakers to make sounds, and also responsible for converting analog microphone signals into digital signals for processing.

[0027] Digital signal processing circuit: used to perform various processing on digital audio signals, such as noise suppression, echo cancellation, equalizer, etc. DSP can provide high-quality audio experience and enhance audio clarity and fidelity.

[0028] Audio power amplifier circuit: used to amplify the low-level analog audio signal output by the codec to a high enough level to drive the speaker to produce a loud enough sound.

[0029] Microphone preamplifier circuit: used to amplify the weak microphone signal to a sufficient level for subsequent digital conversion and processing.

[0030] Power management circuitry: Responsible for providing stable power to the audio system and ensuring that power consumption is managed efficiently in battery-powered devices.

[0031] The control logic circuit includes a chip U1, and grounded resistors R3 and R4 are connected to pins 1 and 3 of the chip U1 respectively, and grounded capacitors C1 are connected to pins 7 and 8 of the chip U1, and capacitors C2 and C3 arranged in parallel are connected between pins 11 and 12 of the chip U1.

[0032] The control logic circuit also includes a transistor Q1, with resistors R8 and R9 connected between the base and emitter of the transistor Q1, a photoresistor RX1 connected between the base and collector of the transistor Q1, one end of the resistor R9 connected to pin 12 of the chip U1, and the emitter of the transistor Q1 connected to pin 16 of the chip U1.

[0033] The control logic circuit also includes a chip U3, wherein pin 1 of chip U3 is connected to pin 3 of chip U1, pin 5 of chip U3 is connected to pin 1 of chip U1, pin 6 of chip U3 is connected to pin 2 of chip U1, and a resistor R5 is connected between pins 2 and 5 of chip U3.

[0034] The control logic circuit is responsible for the control and monitoring of the entire audio system. It has a user interface such as buttons, knobs or software interface, allowing users to easily adjust audio settings. It can adjust audio parameters such as volume, equalizer settings, etc. according to user operations and system status.

[0035] The audio decoding circuit includes a chip U11, a chip U2, a chip U4 and a crystal oscillator Y1, wherein the pin 3 of the chip U1 is connected to the pin 6 of the chip U2, the pin 4 of the chip U1 is connected to the pin 5 of the chip U2, and the capacitor C35, the capacitor C4 and the capacitor C34 arranged in parallel are connected between the pin 2 and the pin 3 of the chip U2;

[0036] Pin 1 of the chip U4 is connected to pin 7 of the chip U2, pin 2 of the chip U4 is connected to pin 21 of the chip U2, pin 5 of the chip U4 is connected to pin 19 of the chip U2, pin 6 of the chip U4 is connected to pin 20 of the chip U2, pin 1 of the crystal oscillator Y1 is connected to pin 15 of the chip U2 and is connected to capacitor C9, and pin 3 of the crystal oscillator Y1 is connected to pin 16 of the chip U2 and is connected to capacitor C10.

[0037] Chip U11 is the control chip of the WIFI module. With the WFi module as the main control, the WifFi module obtains the audio data sent by the server, and then transmits it to the WT2605 chip through the UART serial port for storage. After the transmission is completed, the relevant instructions can be sent directly to control the playback.

[0038] The digital signal processing circuit includes a chip U41, a resistor R178 is connected between pins 3 and 4 of the chip U41, capacitors CT17 and CT20 are connected in parallel to pins 5 and 6 of the chip U41, a resistor R148 is connected to pin 10 of the chip U41, a capacitor C108 is connected to pin 12 of the chip U41, and one end of the resistor R148 and the capacitor C108 are both connected to pin 9 of the chip U41 and grounded;

[0039] Capacitors CT15 and CT19 arranged in parallel are connected to the connection terminals of pins 17, 18 and 19 of the chip U41, a resistor R153 is connected between pins 25 and 24 of the chip U41, and resistor R154 and capacitor CT18 are connected to both ends of the resistor R153, respectively.

[0040] Digital signal processing circuitry processes audio signals to provide a premium audio experience in a variety of environments and conditions.

[0041] The digital signal processing circuit integrates multiple functional modules, such as ADC / DAC, filter, FFT (Fast Fourier Transform) algorithm, etc. It supports user programming, allowing developers to customize signal processing algorithms according to specific needs.

[0042] The audio power amplifier circuit includes an amplifier U10, a terminal CN1, a terminal CN2, and a terminal CN3. A resistor R22 and a resistor R44 are connected between pin 1 and pin 5 of the amplifier U10. A capacitor C33 and a resistor R33 are connected to the wiring terminals of the resistor R22 and the resistor R44. A capacitor C44 is connected to pin 1 of the amplifier U10. A grounded resistor R55 is connected between pin 1 of the terminal CN2 and the capacitor C44.

[0043] A resistor R88 is connected between pins 2 and 3 of the amplifier U10, a resistor R77 and a capacitor C66 are connected to pin 2 of the amplifier U10 in sequence, a capacitor C55 is connected between pin 4 of the amplifier U10 and pin 1 of the connection terminal CN3, and a resistor R66 and a capacitor C77 are connected to pin 4 of the amplifier U10 in sequence.

[0044] Pin 5 of the amplifier U10 is also connected to a grounded capacitor C22, a grounded capacitor C11, and a resistor R11 and a diode D11 connected in series and grounded, and pin 1 of the connection terminal CN1 is connected to the resistor R11.

[0045] The audio power amplifier circuit can provide enough current and voltage to enable the speaker to produce a loud enough sound.

[0046] The microphone preamplifier circuit includes a microphone MIC and a transistor Q2, a capacitor C50 is connected between pin 1 of the microphone MIC and the base of the transistor Q2, a resistor R230 is connected between the base and the collector of the transistor Q2, a resistor R240 and a resistor R220 are connected in series at both ends of the resistor R230 in parallel, and one end of the resistor R230 and one end of the resistor R220 are respectively connected to the two ends of the capacitor C50; a capacitor C60 is connected to the collector of the transistor Q2, and a grounded resistor R260 is connected to the emitter of the transistor Q2.

[0047] The microphone preamplifier circuit features low noise and high gain to ensure clear audio signals are captured.

[0048] The power management circuit includes a chip U20, and capacitors C71 and C61 are connected to pins 5 and 6 of the chip U20 in parallel, a capacitor C101 is connected between pins 10 and 11 of the chip U20, a resistor R81 and a light-emitting diode LED are connected in series at both ends of the capacitor C101, a resistor R91, a capacitor C91 and a capacitor C81 are connected in parallel between pins 24 and 25 of the chip U20, and a resistor R101 is connected between the resistor R91 and the capacitor C91; capacitors C111, C121, C131 and C141 are connected to pin 17 of the chip U20 in parallel.

[0049] The power management circuit features energy saving and high efficiency to ensure the audio system maintains stable performance during long-term use.

[0050] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An audio mainboard control circuit, characterized in that: It includes a control logic circuit for controlling and monitoring an audio mainboard, an audio decoding circuit for converting a digital audio signal into an analog signal, a digital signal processing circuit for performing noise suppression and echo elimination on the digital audio signal, an audio power amplifier circuit for amplifying a low-level analog audio signal into a high-level analog audio signal, a microphone preamplifier circuit for amplifying a weak microphone signal, and a power management circuit for providing a stable power supply to the audio mainboard; the audio decoding circuit, the digital signal processing circuit, the audio power amplifier circuit, the microphone preamplifier circuit and the power management circuit are all electrically connected to the control logic circuit.

2. The audio mainboard control circuit according to claim 1, characterized in that: The control logic circuit includes a chip U1, and grounded resistors R3 and R4 are connected to pins 1 and 3 of the chip U1 respectively, and grounded capacitors C1 are connected to pins 7 and 8 of the chip U1, and capacitors C2 and C3 arranged in parallel are connected between pins 11 and 12 of the chip U1.

3. The audio mainboard control circuit according to claim 1, characterized in that: The audio decoding circuit includes a chip U11, a chip U2, a chip U4 and a crystal oscillator Y1, wherein the pin 3 of the chip U1 is connected to the pin 6 of the chip U2, the pin 4 of the chip U1 is connected to the pin 5 of the chip U2, and the capacitor C35, the capacitor C4 and the capacitor C34 arranged in parallel are connected between the pin 2 and the pin 3 of the chip U2; Pin 1 of the chip U4 is connected to pin 7 of the chip U2, pin 2 of the chip U4 is connected to pin 21 of the chip U2, pin 5 of the chip U4 is connected to pin 19 of the chip U2, pin 6 of the chip U4 is connected to pin 20 of the chip U2, pin 1 of the crystal oscillator Y1 is connected to pin 15 of the chip U2 and is connected to capacitor C9, and pin 3 of the crystal oscillator Y1 is connected to pin 16 of the chip U2 and is connected to capacitor C10.

4. The audio mainboard control circuit according to claim 1, characterized in that: The digital signal processing circuit includes a chip U41, a resistor R178 is connected between pins 3 and 4 of the chip U41, capacitors CT17 and CT20 are connected in parallel to pins 5 and 6 of the chip U41, a resistor R148 is connected to pin 10 of the chip U41, a capacitor C108 is connected to pin 12 of the chip U41, and one end of the resistor R148 and the capacitor C108 are both connected to pin 9 of the chip U41 and grounded; Capacitors CT15 and CT19 arranged in parallel are connected to the connection terminals of pins 17, 18 and 19 of the chip U41, a resistor R153 is connected between pins 25 and 24 of the chip U41, and resistor R154 and capacitor CT18 are connected to both ends of the resistor R153, respectively.

5. The audio mainboard control circuit according to claim 1, characterized in that: The audio power amplifier circuit includes an amplifier U10, a terminal CN1, a terminal CN2, and a terminal CN3. A resistor R22 and a resistor R44 are connected between pin 1 and pin 5 of the amplifier U10. A capacitor C33 and a resistor R33 are connected to the terminals of the resistor R22 and the resistor R44. A capacitor C44 is connected to pin 1 of the amplifier U10. A grounded resistor R55 is connected between pin 1 of the terminal CN2 and the capacitor C44. A resistor R88 is connected between pins 2 and 3 of the amplifier U10, a resistor R77 and a capacitor C66 are connected to pin 2 of the amplifier U10 in sequence, a capacitor C55 is connected between pin 4 of the amplifier U10 and pin 1 of the connection terminal CN3, and a resistor R66 and a capacitor C77 are connected to pin 4 of the amplifier U10 in sequence.

6. The audio mainboard control circuit according to claim 1, characterized in that: The microphone preamplifier circuit includes a microphone MIC and a transistor Q2, a capacitor C50 is connected between pin 1 of the microphone MIC and the base of the transistor Q2, a resistor R230 is connected between the base and the collector of the transistor Q2, a resistor R240 and a resistor R220 are connected in series at both ends of the resistor R230 in parallel, and one end of the resistor R230 and one end of the resistor R220 are respectively connected to the two ends of the capacitor C50; a capacitor C60 is connected to the collector of the transistor Q2, and a grounded resistor R260 is connected to the emitter of the transistor Q2.

7. The audio mainboard control circuit according to claim 1, characterized in that: The power management circuit includes a chip U20, and capacitors C71 and C61 are connected to pins 5 and 6 of the chip U20 in parallel, a capacitor C101 is connected between pins 10 and 11 of the chip U20, a resistor R81 and a light-emitting diode LED are connected in series at both ends of the capacitor C101, a resistor R91, a capacitor C91 and a capacitor C81 are connected in parallel between pins 24 and 25 of the chip U20, and a resistor R101 is connected between the resistor R91 and the capacitor C91; capacitors C111, C121, C131 and C141 are connected to pin 17 of the chip U20 in parallel.

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