Human sound elimination control circuit for mobile outdoor broadcasting sound box

Abstract

The utility model discloses a human voice elimination control circuit for a mobile outdoor broadcasting sound box, which comprises a power supply circuit, a human voice elimination control circuit, a wireless transmission control circuit and a processor control circuit, and is characterized in that the power supply circuit is used for supplying power to and charging the human voice elimination control circuit, the wireless transmission control circuit and the processor control circuit; the wireless transmission control circuit is used for transmitting, receiving and transmitting audio signals and is provided with a chip U3, the processor control circuit is used for signal processing, and the voice elimination control circuit is used for voice elimination processing. The device is convenient to use, is provided with an external port for plug-and-play and one-key control to eliminate human voice, can remarkably improve the elimination degree of human voice signals in music signals, effectively eliminates the human voice, can preserve the effect of background voice of songs to the maximum extent, enables the eliminated human voice elimination signals to be cleaner and purer, and improves the quality of the songs. Finally, ideal accompaniment music is obtained, and the effect of mutual conversion between music and accompaniment is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of live broadcast or broadcasting equipment, and in particular relates to a human voice elimination control circuit for a mobile outdoor broadcasting speaker. Background Art

[0002] Accompaniment is crucial for singing or live streaming. In some cases, songs containing vocals need to be processed to remove them, thereby obtaining the desired accompaniment. Existing vocal removal devices have the following drawbacks: Because the vocals in the two channels are not identical, and the vocal signals fluctuate dynamically, the vocals are not completely removed, leaving some remaining. This is especially true when the vocal signal appears from nowhere, leaving a discernible vocal signal. This prevents users from being able to remove the vocals and obtain the accompaniment with one click, ultimately achieving the desired effect of converting music into accompaniment.

[0003] To this end, we propose a control circuit or device that can effectively improve the cancellation of human voices to solve the above problems. Utility Model Content

[0004] The utility model provides a human voice elimination control circuit for a mobile outdoor broadcasting speaker.

[0005] The utility model is realized by the following technical solutions: including a power supply circuit, a human voice cancellation control circuit, a wireless transmission control circuit, and a processor control circuit. The power supply circuit is used to supply power and charge the human voice cancellation control circuit, the wireless transmission control circuit, and the processor control circuit. The wireless transmission control circuit is used for transmitting and receiving audio signals and is equipped with a chip U3. The processor control circuit is used for signal processing, and the human voice cancellation control circuit is used for human voice cancellation processing.

[0006] The human voice control circuit is equipped with a processing chip U2 and adopts a serial digital audio bus protocol to transmit audio signals. Pins 2 and 3 of the processing chip U2 communicate with the chip U3 via serial ports.

[0007] Pin 4 is the I2S3_LRCLK frame clock, which communicates with pin 4 of chip U3;

[0008] Pin 5 is the I2S3_DIN serial input, which connects to pin 6 of chip U3;

[0009] Pin 7, CTRL_CFG, is the configuration port for the control interface of the original sound cancellation control. It determines the high and low level changes of the MCU control pins 2 (TX2) and 3 (RX2) to communicate the degree of human voice cancellation in the control mode. The truth table is: human voice 100% - human voice 50% - human voice 25% - human voice 0%;

[0010] Pin 13 is the I2S3_BCLK serial clock, which communicates with pin 5 of chip U3;

[0011] Pins 19 / 20 / 21 / 22 are analog audio dual differential output interfaces;

[0012] Pin 25 is STATE, which is used to indicate the working status of the voice cancellation.

[0013] Pin 31 power input interface;

[0014] Pin 34 is MODE0, pin 35 is MODE1, pin 34 is the internal slave input and output configuration setting of I2S3, and pin 35 is the audio master clock output configuration setting.

[0015] The beneficial effects of the utility model are as follows: 1. This control circuit receives the music signal sent by the mobile phone Bluetooth, receives the Bluetooth radio frequency signal, and based on the acoustic principle and the difference between the human voice frequency characteristics and the background music frequency, first completely decodes the normal full-band music signal, and then communicates it to the professional decoding processor through IIS, performs special algorithm processing, and finally retains only the background instrument and other signals other than the human voice;

[0016] 2. Significantly improve the degree of elimination of vocal signals in music signals. While effectively eliminating vocals, it can also maximize the preservation of the background sound of the song, making the eliminated vocal signal cleaner and purer, ultimately obtaining the ideal accompaniment and achieving the effect of mutual transformation between music and accompaniment;

[0017] 3. The professional-grade vocal cancellation control circuit is developed and designed for mobile outdoor active karaoke speakers. The external port on this control circuit or the wireless transmission control circuit can be used to connect to external devices. It is easy to use and can be plug-and-play with an external port. The vocal cancellation can be controlled with one button, and the karaoke and live accompaniment effect comparable to karaoke can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a block diagram of the working principle of the utility model;

[0019] Figure 2 This is a schematic diagram of the human voice control circuit;

[0020] Figure 3 This is a schematic diagram of the wireless transmission control circuit;

[0021] Figure 4 is a schematic diagram of a processor control circuit;

[0022] Figure 5 This is a schematic diagram of the power supply circuit. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, its specific implementation methods are described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 5 The mobile outdoor broadcasting speaker uses a human voice elimination control circuit, including a power supply circuit, a human voice elimination control circuit, a wireless transmission control circuit, and a processor control circuit. The power supply circuit is used to power and charge the human voice elimination control circuit, the wireless transmission control circuit, and the processor control circuit. The wireless transmission control circuit is used for transmitting and receiving audio signals and is equipped with a chip U3. The processor control circuit is used for signal processing, and the human voice elimination control circuit is used for human voice elimination processing.

[0025] The human voice control circuit is equipped with a processing chip U2 and adopts a serial digital audio bus protocol to transmit audio signals. Pins 2 and 3 of the processing chip U2 communicate with the chip U3 via serial ports.

[0026] Pin 4 is the I2S3_LRCLK frame clock, which communicates with pin 4 of chip U3;

[0027] Pin 5 is the I2S3_DIN serial input, which connects to pin 6 of chip U3;

[0028] Pin 7, CTRL_CFG, is the configuration port for the control interface of the original sound cancellation control. It determines the high and low level changes of the MCU control pins 2 (TX2) and 3 (RX2) to communicate the degree of human voice cancellation in the control mode. The truth table is: human voice 100% - human voice 50% - human voice 25% - human voice 0%;

[0029] Pin 9 is the internal digital 3.3v power supply;

[0030] Pins 10 and 11, UP-TX1 / DM and UP-RX1 / DP are the upgrade serial ports;

[0031] Pin 13 is the I2S3_BCLK serial clock, which communicates with pin 5 of chip U3;

[0032] Pins 19 / 20 / 21 / 22 are analog audio dual differential output interfaces;

[0033] Pin 25 is STATE, which is used to indicate the working status of the voice cancellation.

[0034] Pin 28 is VDD12, which is the internal digital power supply 1.2v pin;

[0035] Pin 31 power input interface;

[0036] Pin 32 is the internal digital power 1.8v pin;

[0037] Pin 34 is MODE0, pin 35 is MODE1, pin 34 is the internal slave input and output configuration setting of I2S3, pin 35 is the audio master clock output configuration setting;

[0038] Pin 36 is the audio MCLK output configuration function, that is, selecting the main clock frequency;

[0039] Pins 38 and 39 are the connection ports for the crystal oscillator.

[0040] The wireless transmission control circuit is a Bluetooth audio codec circuit,

[0041] Pin 1 of the chip U3 is used to transmit digital audio signals, and is connected to resistor R13;

[0042] Pins 3, 4, 5, and 6 are used to communicate with the processing chip U2 of the voice cancellation control circuit to achieve audio signal transmission, and pins 3, 4, 5, and 6 are respectively connected to resistors;

[0043] Pins 8, 9, 10, and 11 are connected to the power supply circuit to supply power to the chip U3 and provide the required operating voltage for the chip U3;

[0044] Pin 17 is connected to the control switch, which is used to control the working state of the circuit, and is connected to the resistor R18;

[0045] Pin 22 is connected to the signal transceiver circuit through resistor R25, which is used to establish a Bluetooth communication connection with an external device;

[0046] Pin 25 and pin 26 are connected to the crystal oscillator circuit.

[0047] Pins 27 and 28 are used for USB data signal transmission;

[0048] Pins 32 and 33 are used for signal transmission and reception;

[0049] Pin 34 is used to indicate the working status and is connected to a signal light;

[0050] Pin 37 is connected to the infrared communication circuit;

[0051] Pins 43, 44, 45, and 46 are connected to the DAC analog circuit for powering the DAC analog circuit, and pins 43, 44, and 45 are respectively connected to resistor R9, which is connected to pin 46. A capacitor C6 is connected in parallel to resistor R9, and capacitors are connected between pins 43, 44, and resistor R9.

[0052] Pin 48 is connected to an auxiliary register circuit for storing control or status information, and is connected to a resistor R15.

[0053] The processor control circuit is an operational amplifier circuit, which is equipped with a chip IC1. Pin 1 of the chip IC1 is used for power supply of the circuit, and is connected in series with an inductor L1, capacitors C48, C35, and C36.

[0054] Pins 7 and 8 are used for audio signal input. Pin 7 is connected to resistors R11 and R29 respectively. Resistor R11 is connected to capacitor C31. Pin 8 is connected to resistors R10 and R7 respectively. Resistor R10 is connected to capacitor C29. Resistor R7 is connected to pin 10. Capacitor C41 is connected in parallel to resistor R7. Pins 7 and 8 transmit the audio signal processed by this circuit to the speaker.

[0055] Pins 10 and 12 are connected to a signal transmission port, which is used to connect an external microphone and / or speaker. A capacitor C11 is connected between pin 10 and the signal transmission port, and a capacitor C10 is connected between pin 12 and the signal transmission port.

[0056] Pin 13 provides the operating voltage suitable for this circuit and is used for voltage protection of this circuit;

[0057] Pins 14 and 15 are used for audio signal input, transmitting the audio signal collected by the microphone to this circuit. Pin 14 is connected to resistor R28 and capacitor C40 respectively. Resistor R28 is connected to capacitor C30. The front end of capacitor C40 is equipped with resistor R6 in parallel with pin 12.

[0058] Pin 16 is used to control the working state of this circuit. A resistor R32 is provided on the pin, which is connected to the control switch.

[0059] The interface end of the power supply circuit is a Type-C interface, and the Type-C interface is equipped with a USB interface chip. The power supply circuit is equipped with power management chips U1 and U4. The power management chip U1 adopts the ME6209A33PG model chip, and the power management chip U4 adopts the ME6209A40PG model chip.

[0060] The chip U3 is AB5301A.

[0061] The processing chip U2 is a PTN1118 chip.

[0062] The chip IC1 is a chip of the SGM4917A model.

[0063] The working method of the present invention is as follows: the Type-C interface of the power supply circuit of the present circuit is connected to the power adapter, and the power adapter is connected to the power supply, so that the power supply circuit provides power for the present circuit, the signal transmission port of the processor control circuit is connected to the broadcasting equipment such as the audio system, the wireless transmission control circuit is started, and paired with the mobile terminal such as the mobile phone and the tablet to establish Bluetooth signal communication. The mobile terminal such as the mobile phone and the tablet has a built-in Bluetooth communication module to transmit the language signal to the wireless transmission control circuit, and the wireless transmission control circuit transmits the language signal to the voice cancellation control circuit for voice cancellation processing. After further processing and optimization by the processor control circuit, the language signal is played through the broadcasting equipment such as the audio system.

[0064] During the broadcasting process, the music is played in its original form. When vocal cancellation is required, the amount of vocal cancellation can be adjusted according to the actual accompaniment requirements through the function buttons on the vocal cancellation control circuit. You can choose an cancellation amount of 25%, 50% or 100% (complete cancellation), or you can choose to turn off the vocal cancellation function.

Claims

1. A voice cancellation control circuit for a mobile outdoor broadcasting speaker, comprising a power supply circuit, a voice cancellation control circuit, a wireless transmission control circuit, and a processor control circuit, characterized in that: The power supply circuit is used to power and charge the voice cancellation control circuit, the wireless transmission control circuit, and the processor control circuit. The wireless transmission control circuit is used for transmitting and receiving audio signals and is equipped with a chip U3. The processor control circuit is used for signal processing, and the voice cancellation control circuit is used for voice cancellation processing. The human voice control circuit is equipped with a processing chip U2 and adopts a serial digital audio bus protocol to transmit audio signals. Pins 2 and 3 of the processing chip U2 communicate with the chip U3 via serial ports. Pin 4 is the I2S3_LRCLK frame clock, which communicates with pin 4 of chip U3; Pin 5 is the I2S3_DIN serial input, which connects to pin 6 of chip U3; Pin 7, CTRL_CFG, is the configuration port for the control interface of the original sound cancellation control. It determines the high and low level changes of the MCU control pins 2 (TX2) and 3 (RX2) to communicate the degree of human voice cancellation in the control mode. The truth table is: human voice 100% - human voice 50% - human voice 25% - human voice 0%; Pin 13 is the I2S3_BCLK serial clock, which communicates with pin 5 of chip U3; Pins 19 / 20 / 21 / 22 are analog audio dual differential output interfaces; Pin 25 is STATE, which is used to indicate the working status of the voice cancellation. Pin 31 power input interface; Pin 34 is MODE0, pin 35 is MODE1, pin 34 is the internal slave input and output configuration setting of I2S3, and pin 35 is the audio master clock output configuration setting.

2. The human voice cancellation control circuit for a mobile outdoor broadcasting speaker according to claim 1, characterized in that: The wireless transmission control circuit is a Bluetooth audio codec circuit, and pin 1 of its chip U3 is used to transmit digital audio signals; pins 3, 4, 5, and 6 are used to communicate with the processing chip U2 of the voice cancellation control circuit to realize audio signal transmission; pins 8, 9, 10, and 11 are connected to the power supply circuit for powering chip U3 and providing the operating voltage required by chip U3; pin 17 is connected to the control switch for controlling the working status of this circuit; pin 22 is connected to the signal transceiver circuit for establishing a Bluetooth communication connection with an external device; pins 25 and 26 are connected to the crystal oscillator circuit, and pins 27 and 28 are used for USB data signal transmission; pins 32 and 33 are used for signal transmission and reception; pin 34 is used for working status indication and is connected to a signal light; pin 37 is connected to the infrared communication circuit; pins 43, 44, 45, and 46 are connected to the DAC analog circuit for powering the DAC analog circuit; pin 48 is connected to the auxiliary register circuit for storing control or status information.

3. The human voice cancellation control circuit for a mobile outdoor broadcasting speaker according to claim 1, characterized in that: The processor control circuit is an operational amplifier circuit, which is equipped with a chip IC1. Pin 1 of chip IC1 is used to power this circuit; pins 7 and 8 are used for audio signal input, and pin 8 is connected to pin 10 to transmit the audio signal processed by this circuit to the speaker; pins 10 and 12 are connected to the signal transmission port, and the signal transmission port is used to connect an external microphone and / or speaker; pin 13 provides an operating voltage suitable for this circuit and is used for voltage protection of this circuit; pins 14 and 15 are used for audio signal input, and pin 14 is connected to pin 12, and a resistor R6 is connected in parallel between pins 14 and 12 to transmit the audio signal collected by the microphone to this circuit; pin 16 is used to control the working state of this circuit, and it is connected to the control switch.

4. The human voice cancellation control circuit for a mobile outdoor broadcasting speaker according to claim 1, characterized in that: The interface end of the power supply circuit is a Type-C interface, and the Type-C interface is equipped with a USB interface chip. The power supply circuit is equipped with power management chips U1 and U4. The power management chip U1 adopts the ME6209A33PG model chip, and the power management chip U4 adopts the ME6209A40PG model chip.

5. The human voice cancellation control circuit for a mobile outdoor broadcasting speaker according to claim 1 or 2, characterized in that: The chip U3 is AB5301A.

6. The human voice cancellation control circuit for a mobile outdoor broadcasting speaker according to claim 1, characterized in that: The processing chip U2 is a PTN1118 chip.

7. The human voice cancellation control circuit for a mobile outdoor broadcasting speaker according to claim 3, characterized in that: The chip IC1 is a chip of the SGM4917A model.

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