Audio speaker volume intelligent control system and broadcasting system

Abstract

The application discloses an audio loudspeaker volume intelligent control system and a broadcasting system, the volume intelligent control system comprising a master control circuit, an ambient noise detection circuit, a volume output power determination circuit and an audio signal output power adjustment circuit; the ambient noise detection circuit is used to collect the noise value of the on-site environment, and the ambient noise detection circuit sends the acquired ambient noise value to the master control circuit; the volume output power determination circuit is used to determine the volume output power of the loudspeaker according to the noise value of the on-site environment, and the volume output power determination circuit sends the determined power data to the audio signal output power adjustment circuit; when the audio signal output power adjustment circuit monitors audio input, the audio signal output power adjustment circuit modulates the input power of the audio loudspeaker according to the determined output power, so as to realize intelligent volume control. The application can adaptively adjust the broadcasting volume according to the ambient noise, and provide a more perfect listening effect for the audience of the broadcasting system.

Description

Technical Field

[0001] This invention belongs to the field of volume control technology, and relates to a volume control system, and more particularly to an intelligent control system for audio speaker volume and a broadcasting system. Background Technology

[0002] Public address systems are widely used in industries such as railways and shipping. Existing public address systems use loudspeakers rated at 70-110V, which are found in various locations such as waiting rooms, ticket halls, ticket gates, platforms, station plazas, station halls, and train carriages. These systems typically have a pre-set volume level that can be manually adjusted as needed.

[0003] The existing broadcasting system has the following defects: (1) The existing broadcasting system uses the same volume regardless of the noise level of the background environment of each place, which can easily affect the listening experience of passengers. Passengers may not be able to hear the broadcast content because the external environment noise is too loud (the broadcast volume is relatively too low); or they may feel that the sound is very loud because the outside is very quiet (the broadcast volume is relatively too low).

[0004] In view of this, there is an urgent need to design a new broadcast audio control method in order to overcome at least some of the aforementioned defects of the existing broadcast audio control methods. Summary of the Invention

[0005] This invention provides an intelligent control system for audio speaker volume and a broadcasting system, which can adaptively adjust the broadcast volume according to the level of ambient noise, providing listeners with a better listening experience.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, the following technical solution is adopted:

[0007] An intelligent control system for audio speaker volume, the intelligent control system comprising: a main control circuit, an ambient noise detection circuit, a volume output power determination circuit, and an audio signal output power adjustment circuit;

[0008] The main control circuit is connected to the ambient noise detection circuit, the volume output power determination circuit, and the audio signal output power adjustment circuit, respectively.

[0009] The environmental noise detection circuit is used to collect the noise value of the on-site environment. The environmental noise detection circuit sends the acquired environmental noise value to the main control circuit. The main control circuit sends the acquired noise value to the volume output power determination circuit.

[0010] The volume output power determination circuit is used to determine the volume output power of the speaker based on the noise level of the ambient environment. The volume output power determination circuit sends the determined power data to the audio signal output power adjustment circuit.

[0011] When the audio signal output power adjustment circuit detects audio input, it modulates the input power of the audio speaker according to the determined output power to achieve intelligent volume control.

[0012] As one embodiment of the present invention, the volume intelligent control system further includes: a power management circuit, an audio signal input receiving and adjustment circuit, an audio signal output circuit, and an audio signal input and output direct control circuit;

[0013] The main control circuit is connected to the power management circuit, the audio signal input receiving and adjustment circuit, the audio signal output circuit, and the audio signal input and output direct control circuit, respectively.

[0014] The power management circuit is used to manage the energy input on the audio signal input line. When the lithium battery charging conditions are met, the controller's energy storage lithium battery is charged. When the energy of the lithium battery is insufficient to power the controller of the main control circuit, the controller automatically enters sleep mode and stops controlling the audio signal.

[0015] The audio signal input receiving and adjustment circuit is used to generate microcontroller broadcast interrupt input and voice control signal sampling input for the original audio signal input, and at the same time to filter, shape and reduce noise of the input audio signal.

[0016] The audio signal output circuit is used to adjust the output power of the audio signal according to the set adjustment power level, and to shape the audio signal before outputting it to the audio line.

[0017] The audio signal input / output pass-through control circuit is activated in two situations: one is when the controller receives a command to stop adjusting the audio power output, it will interrupt the power adjustment of the original audio signal and directly output the original input audio signal without adjustment; the other is when the energy storage lithium battery is insufficient to power the controller, it will automatically activate the audio signal input / output pass-through control circuit and directly output the original audio signal.

[0018] In one embodiment of the present invention, the main control circuit includes a fourth microcontroller U4, a fifty-first resistor R51, a twenty-first indicator light D21, a forty-sixth resistor R46, a fifty-sixth resistor R56, and a second four-pin connector P2; the 44th pin of the fourth microcontroller U4 is connected to the first power supply voltage through the fifty-first resistor R51 and the twenty-first indicator light D21.

[0019] Pins 26, 27, 28, 33, 34, 45, and 46 of the fourth microcontroller U4 are connected to the audio signal output power adjustment circuit, respectively; pins PA0 and PA6 of the fourth microcontroller U4 are connected to the audio signal input receiving adjustment circuit, pins PA1 and PA4 of the fourth microcontroller U4 are connected to the ambient noise detection circuit, and pin 47 of the fourth microcontroller U4 is connected to the charging circuit.

[0020] As one embodiment of the present invention, the audio signal input receiving and adjustment circuit includes a 21st resistor R21, a 31st rectifier diode D31, a 32nd resistor R32, a 25th Zener diode D25, a 19th capacitor C19, a 17th resistor R17, a 20th resistor R20, a 33rd resistor R33, and a 6th capacitor C6.

[0021] The first end of the 21st resistor R21 is connected to the first end of the 32nd resistor R32, and the second end of the 21st resistor R21 is grounded.

[0022] The negative terminal of the thirty-first rectifier diode D31 is connected to the first terminal of the twentieth resistor R20, the negative terminal of the twenty-fifth Zener diode D25, the first terminal of the nineteenth capacitor C19, the first terminal of the seventeenth resistor R17, and the first terminal of the thirty-third resistor R33.

[0023] The second end of the twentieth resistor R20 is connected to the PA6 pin of the fourth microcontroller U4, the second end of the thirtieth resistor R33 is connected to the PA0 pin of the fourth microcontroller U4, and the positive terminal of the twentieth Zener diode D25, the second end of the nineteenth capacitor C19, and the second end of the seventeenth resistor R17 are grounded respectively.

[0024] In one embodiment of the present invention, the environmental noise detection circuit includes a first microphone MK1, a twenty-eighth resistor R28, a thirteenth capacitor C13, a twelfth capacitor C12, a twenty-ninth resistor R29, a thirty-fifth resistor R35, a second operational amplifier U2, a fourteenth rectifier diode D14, an eleventh capacitor C11, a twenty-sixth resistor R26, a thirty-first resistor R31, a fourteenth capacitor C14, a fifteenth capacitor C15, a fortieth resistor R40, a thirty-ninth capacitor R39, and an eighteenth capacitor C18;

[0025] The first end of the first microphone MK1 is connected to the first end of the twelfth capacitor C12, the first end of the thirteenth capacitor C13, and the second end of the twenty-eighth resistor R28. The second end of the first microphone MK1 is grounded, and the second end of the thirteenth capacitor C13 is grounded.

[0026] The second terminal of the twelfth capacitor C12 is connected to the second terminal of the twenty-ninth resistor R29, the first terminal of the thirty-fifth resistor R35, and the non-inverting input terminal of the second operational amplifier U2; the second terminal of the thirty-fifth resistor R35 is grounded.

[0027] The inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the fifteenth capacitor C15, the second terminal of the thirty-ninth resistor R39, and the first terminal of the fortieth resistor R40, respectively; the first terminal of the thirty-ninth resistor R39 is connected to the second terminal of the eighteenth capacitor C18, and the first terminal of the eighteenth capacitor C18 is grounded.

[0028] The output terminal of the second operational amplifier U2 is connected to the second terminal of the fifteenth capacitor C15, the second terminal of the fortieth resistor R40, the first terminal of the thirty-first resistor R31, and the positive terminal of the fourteenth rectifier diode D14, respectively.

[0029] The negative terminal of the fourteenth rectifier diode D14 is connected to the first terminal of the eleventh capacitor C11, the PA1 pin of the fourth microcontroller U4, and the first terminal of the twenty-sixth resistor R26; the second terminal of the eleventh capacitor C11 and the second terminal of the twenty-sixth resistor R26 are grounded respectively.

[0030] The second end of the thirty-first resistor R31 is connected to the first end of the fourteenth capacitor C14 and the PA4 pin of the fourth microcontroller U4, respectively; the second end of the fourteenth capacitor C14 is grounded.

[0031] In one embodiment of the present invention, the power management circuit includes a first DC / DC converter U1, a fifth rectifier diode D5, a sixth rectifier diode D6, a seventh rectifier diode D7, an eighth rectifier diode D8, a seventh resistor R7, a zero-polarity capacitor C0, an eleventh Zener diode D11, a first capacitor C1, a tenth resistor R10, a second resistor R2, a sixth resistor R6, a first power inductor L1, a second capacitor C2, a fifth polarity capacitor C5, a first resistor R1, a fourth rectifier diode D4, a first rechargeable lithium battery BT1, a zero-polarity light-emitting diode D0, and a twenty-second light-emitting diode D22.

[0032] The IN pin of the first DC / DC converter U1 is connected to the negative terminal of the sixth rectifier diode D6, the negative terminal of the eighth rectifier diode D8, the first terminal of the seventh resistor R7, and the first terminal of the zero-polarity capacitor C0, respectively; the second terminal of the zero-polarity capacitor C0 is grounded.

[0033] The EN pin of the first DC / DC converter U1 is connected to the second terminal of the seventh resistor R7 and the negative terminal of the eleventh Zener diode D11, respectively; the positive terminal of the eleventh Zener diode D11 is grounded.

[0034] The anode of the sixth rectifier diode D6 is connected to the cathode of the fifth rectifier diode D5, and the anode of the fifth rectifier diode D5 is grounded; the anode of the eighth rectifier diode D8 is connected to the cathode of the seventh rectifier diode D7, and the anode of the seventh rectifier diode D7 is grounded.

[0035] The BS pin of the first DC / DC converter U1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is connected to the sixth pin of the first DC / DC converter U1 and the first terminal of the first power inductor L1 respectively; the second terminal of the first power inductor L1 is connected to the first terminal of the second resistor R2, the first terminal of the second capacitor C2, and the first terminal of the first resistor R1 respectively.

[0036] The second pin of the first DC / DC converter U1 is grounded through the tenth resistor R10; the first pin of the first DC / DC converter U1 is connected to the first end of the sixth resistor R6, the second end of the second resistor R2, and the second end of the second capacitor C2 respectively; the second end of the sixth resistor R6 is grounded.

[0037] The second end of the first resistor R1 is connected to the positive terminal of the fourth rectifier diode D4. The negative terminal of the fourth rectifier diode D4 is connected to the positive terminal of the first rechargeable lithium battery BT1 and the positive terminal of the zeroth light-emitting diode D0. The negative terminal of the zeroth light-emitting diode D0 is connected to the positive terminal of the twenty-second light-emitting diode D22. The negative terminals of the twenty-second light-emitting diode D22 and the negative terminal of the first rechargeable lithium battery BT1 are grounded.

[0038] In one embodiment of the present invention, the audio signal output power adjustment circuit includes channel 0 / 0, channel 1 / 1, channel 1 / 2, channel 1 / 4, channel 1 / 8, and channel 1 / 16.

[0039] The 0 / 0 channel includes the 53rd resistor R53, the 23rd transistor Q23, the 54th resistor R54, and the 24th transistor Q24;

[0040] The forty-sixth pin of the fourth microcontroller U4 is connected to the first end of the fifty-third resistor R53, and the second end of the fifty-third resistor R53 is connected to the base of the twenty-third transistor Q23; the emitter of the twenty-third transistor Q23 is grounded.

[0041] The forty-fifth pin of the fourth microcontroller U4 is connected to the first end of the fifty-fourth resistor R54, and the second end of the fifty-fourth resistor R54 is connected to the base of the twenty-fourth transistor Q24; the emitter of the twenty-fourth transistor Q24 is grounded.

[0042] The first / 1 channel includes an eighth resistor R8, a third transistor Q3, a third capacitor C3, a ninth Zener diode D9, a first MOSFET Q1, a third resistor R3, a ninth resistor R9, a second MOSFET Q2, a twenty-fourth diode D24, a fourth capacitor C4, a fourth resistor R4, a thirty-second diode D32, a tenth Zener diode D10, a fifth resistor R5, an eleventh resistor R11, a fourth transistor Q4, and a twenty-sixth diode D26;

[0043] The 34th pin of the fourth microcontroller U4 is connected to the first end of the eighth resistor R8 and the first end of the eleventh resistor R11, respectively.

[0044] The second end of the eighth resistor R8 is connected to the base of the third transistor Q3, and the emitter of the third transistor Q3 is grounded.

[0045] The collector of the third transistor Q3 is connected to the first terminal of the third capacitor C3, the negative terminal of the ninth Zener diode D9, the gate of the first MOSFET Q1, and the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the negative terminal of the twenty-fourth diode D24, and the positive terminal of the twenty-fourth diode D24 is connected to the second power supply voltage.

[0046] The drain of the first MOSFET Q1 is connected to the first terminal of the ninth resistor R9; the second terminal of the third capacitor C3, the positive terminal of the ninth Zener diode D9, and the source of the first MOSFET Q1 are respectively grounded;

[0047] The second end of the ninth resistor R9 is connected to the drain of the second MOS transistor Q2, and the gate of the second MOS transistor Q2 is connected to the first end of the fourth resistor R4, the first end of the fourth capacitor C4, the negative terminal of the tenth Zener diode D10, and the first end of the fifth resistor R5.

[0048] The second terminal of the fourth resistor R4 is connected to the negative terminal of the thirty-second diode D32, and the positive terminal of the thirty-second diode D32 is connected to the third power supply voltage.

[0049] The source of the second MOSFET Q2 is connected to the second terminal of the fourth capacitor C4 and the positive terminal of the tenth Zener diode D10; the second terminal of the fifth resistor R5 is connected to the positive terminal of the twenty-sixth diode D26.

[0050] The second end of the eleventh resistor R11 is connected to the base of the fourth transistor Q4, the cathode of the twenty-sixth diode D26 is connected to the collector of the fourth transistor Q4, and the emitter of the fourth transistor Q4 is grounded.

[0051] The first / second channel includes the eighteenth resistor R18, the twenty-second resistor R22, the ninth transistor Q9, the thirteenth transistor Q10, the seventh capacitor C7, the twelfth Zener diode D12, the seventh MOSFET Q7, the twelfth resistor R12, the thirty-third diode D33, the nineteenth resistor R19, the eighth MOSFET Q8, the thirteenth resistor R13, the eighth capacitor C8, the thirty-fourth diode D34, the thirteenth Zener diode D13, the fourteenth resistor R14, and the twenty-seventh diode D27;

[0052] The 33rd pin of the fourth microcontroller U4 is connected to the first end of the 18th resistor R18 and the first end of the 22nd resistor R22, respectively.

[0053] The second end of the eighteenth resistor R18 is connected to the base of the ninth transistor Q9, and the emitter of the ninth transistor Q9 is grounded.

[0054] The collector of the ninth transistor Q9 is connected to the first terminal of the seventh capacitor C7, the negative terminal of the twelfth Zener diode D12, the gate of the seventh MOSFET Q7, and the first terminal of the twelfth resistor R12; the second terminal of the twelfth resistor R12 is connected to the negative terminal of the thirty-third diode D33, and the positive terminal of the thirty-third diode D33 is connected to the second power supply voltage.

[0055] The drain of the seventh MOSFET Q7 is connected to the first terminal of the nineteenth resistor R19; the second terminal of the seventh capacitor C7, the positive terminal of the twelfth Zener diode D12, and the source of the seventh MOSFET Q7 are respectively grounded;

[0056] The second end of the nineteenth resistor R19 is connected to the drain of the eighth MOS transistor Q8, and the gate of the eighth MOS transistor Q8 is connected to the first end of the thirteenth resistor R13, the first end of the eighth capacitor C8, the negative terminal of the thirteenth Zener diode D13, and the first end of the fourteenth resistor R14.

[0057] The second terminal of the thirteenth resistor R13 is connected to the negative terminal of the thirty-fourth diode D34, and the positive terminal of the thirty-fourth diode D34 is connected to the third power supply voltage.

[0058] The source of the eighth MOSFET Q8 is connected to the second terminal of the eighth capacitor C8 and the positive terminal of the thirteenth Zener diode D13; the second terminal of the fourteenth resistor R14 is connected to the positive terminal of the twenty-seventh diode D27.

[0059] The second end of the 22nd resistor R22 is connected to the base of the 13th transistor Q10, the cathode of the 27th diode D27 is connected to the collector of the 13th transistor Q10, and the emitter of the 13th transistor Q10 is grounded.

[0060] The first / fourth channel includes the twenty-seventh resistor R27, the thirty-fourth resistor R34, the thirteenth transistor Q13, the fourteenth transistor Q14, the ninth capacitor C9, the fifteenth Zener diode D15, the eleventh MOSFET Q11, the twenty-third resistor R23, the thirty-fifth diode D35, the thirtieth resistor R30, the twelfth MOSFET Q12, the twenty-fourth resistor R24, the tenth capacitor C10, the thirty-sixth diode D36, the sixteenth Zener diode D16, the twenty-fifth resistor R25, and the twenty-eighth diode D28;

[0061] The 28th pin of the fourth microcontroller U4 is connected to the first end of the 27th resistor R27 and the first end of the 34th resistor R34, respectively.

[0062] The second end of the 27th resistor R27 is connected to the base of the 13th transistor Q13, and the emitter of the 13th transistor Q13 is grounded;

[0063] The collector of the thirteenth transistor Q13 is connected to the first terminal of the ninth capacitor C9, the negative terminal of the fifteenth Zener diode D15, the gate of the eleventh MOSFET Q11, and the first terminal of the twenty-third resistor R23; the second terminal of the twenty-third resistor R23 is connected to the negative terminal of the thirty-fifth diode D35, and the positive terminal of the thirty-fifth diode D35 is connected to the second power supply voltage.

[0064] The drain of the eleventh MOSFET Q11 is connected to the first terminal of the thirtieth resistor R30; the second terminal of the ninth capacitor C9, the positive terminal of the fifteenth Zener diode D15, and the source of the eleventh MOSFET Q11 are respectively grounded.

[0065] The second end of the thirtieth resistor R30 is connected to the drain of the twelfth MOS transistor Q12, and the gate of the twelfth MOS transistor Q12 is connected to the first end of the twenty-fourth resistor R24, the first end of the tenth capacitor C10, the negative terminal of the sixteenth Zener diode D16, and the first end of the twenty-fifth resistor R25.

[0066] The second terminal of the 24th resistor R24 ​​is connected to the negative terminal of the 36th diode D36, and the positive terminal of the 36th diode D36 is connected to the third power supply voltage.

[0067] The source of the twelfth MOSFET Q12 is connected to the second terminal of the tenth capacitor C10 and the positive terminal of the sixteenth Zener diode D16; the second terminal of the twenty-fifth resistor R25 is connected to the positive terminal of the twenty-eighth diode D28.

[0068] The second end of the thirty-fourth resistor R34 is connected to the base of the fourteenth transistor Q14, the negative terminal of the twenty-eighth diode D28 is connected to the collector of the fourteenth transistor Q14, and the emitter of the fourteenth transistor Q14 is grounded.

[0069] The first / eighth channel includes resistor R41 (41st), resistor R43 (43rd), transistor Q17 (17th), transistor Q18 (18th), capacitor C16 (16th), Zener diode D17 (17th), MOSFET Q15 (15th), resistor R36 (36th), diode D37 (37th), resistor R42 (42nd), MOSFET Q16 (16th), resistor R37 (37th), capacitor C17 (17th), diode D38 (38th), Zener diode D18 (18th), resistor R38 (38th), and diode D29 (29th).

[0070] The 27th pin of the fourth microcontroller U4 is connected to the first end of the 41st resistor R41 and the first end of the 43rd resistor R43, respectively.

[0071] The second end of the forty-first resistor R41 is connected to the base of the seventeenth transistor Q17, and the emitter of the seventeenth transistor Q17 is grounded.

[0072] The collector of the seventeenth transistor Q17 is connected to the first terminal of the sixteenth capacitor C16, the negative terminal of the seventeenth Zener diode D17, the gate of the fifteenth MOSFET Q15, and the first terminal of the thirty-sixth resistor R36; the second terminal of the thirty-sixth resistor R36 is connected to the negative terminal of the thirty-seventh diode D37, and the positive terminal of the thirty-seventh diode D37 is connected to the second power supply voltage.

[0073] The drain of the fifteenth MOSFET Q15 is connected to the first terminal of the forty-second resistor R42; the second terminal of the sixteenth capacitor C16, the positive terminal of the seventeenth Zener diode D17, and the source of the fifteenth MOSFET Q15 are respectively grounded.

[0074] The second end of the forty-second resistor R42 is connected to the drain of the sixteenth MOS transistor Q16, and the gate of the sixteenth MOS transistor Q16 is connected to the first end of the thirty-seventh resistor R37, the first end of the seventeenth capacitor C17, the negative terminal of the eighteenth Zener diode D18, and the first end of the thirty-eighth resistor R38.

[0075] The second terminal of the thirty-seventh resistor R37 is connected to the negative terminal of the thirty-eighth diode D38, and the positive terminal of the thirty-eighth diode D38 is connected to the third power supply voltage.

[0076] The source of the sixteenth MOSFET Q16 is connected to the second terminal of the seventeenth capacitor C17 and the positive terminal of the eighteenth Zener diode D18; the second terminal of the thirty-eighth resistor R38 is connected to the positive terminal of the twenty-ninth diode D29.

[0077] The second end of the forty-third resistor R43 is connected to the base of the eighteenth transistor Q18, the cathode of the twenty-ninth diode D29 is connected to the collector of the eighteenth transistor Q18, and the emitter of the eighteenth transistor Q18 is grounded.

[0078] The first / 16th channel includes the forty-eighth resistor R48, the fiftieth resistor R50, the twenty-first transistor Q21, the twenty-second transistor Q22, the twentieth capacitor C20, the nineteenth Zener diode D19, the nineteenth MOSFET Q19, the forty-fourth resistor R44, the thirty-ninth diode D39, the forty-ninth resistor R49, the twentieth MOSFET Q20, the forty-fifth resistor R45, the twenty-first capacitor C21, the fortieth diode D40, the twentieth Zener diode D20, the forty-seventh resistor R47, and the thirtieth diode D30;

[0079] The 26th pin of the fourth microcontroller U4 is connected to the first end of the 48th resistor R48 and the first end of the 50th resistor R50, respectively.

[0080] The second end of the forty-eighth resistor R48 is connected to the base of the twenty-first transistor Q21, and the emitter of the twenty-first transistor Q21 is grounded;

[0081] The collector of the 21st transistor Q21 is connected to the first terminal of the 20th capacitor C20, the negative terminal of the 19th Zener diode D19, the gate of the 19th MOSFET Q19, and the first terminal of the 44th resistor R44; the second terminal of the 44th resistor R44 is connected to the negative terminal of the 39th diode D39, and the positive terminal of the 39th diode D39 is connected to the second power supply voltage.

[0082] The drain of the nineteenth MOSFET Q19 is connected to the first terminal of the forty-ninth resistor R49; the second terminal of the twentieth capacitor C20, the positive terminal of the nineteenth Zener diode D19, and the source of the nineteenth MOSFET Q19 are respectively grounded.

[0083] The second end of the forty-ninth resistor R49 is connected to the drain of the twentieth MOS transistor Q20, and the gate of the twentieth MOS transistor Q20 is connected to the first end of the forty-fifth resistor R45, the first end of the twenty-first capacitor C21, the negative terminal of the twentieth Zener diode D20, and the first end of the forty-seventh resistor R47.

[0084] The second terminal of the forty-fifth resistor R45 is connected to the negative terminal of the fortieth diode D40, and the positive terminal of the fortieth diode D40 is connected to the third power supply voltage.

[0085] The source of the twentieth MOSFET Q20 is connected to the second terminal of the twenty-first capacitor C21 and the positive terminal of the twentieth Zener diode D20, respectively; the second terminal of the forty-seventh resistor R47 is connected to the positive terminal of the thirtieth diode D30.

[0086] The second end of the fiftieth resistor R50 is connected to the base of the twenty-second transistor Q22, the cathode of the thirtieth diode D30 is connected to the collector of the twenty-second transistor Q22, and the emitter of the twenty-second transistor Q22 is grounded.

[0087] As one embodiment of the present invention, the audio signal input / output direct control circuit includes a third voltage comparator chip U3, a fifth NMOS transistor Q5, a sixth PMOS transistor Q6, a fifteenth resistor R15, and a sixteenth resistor R16.

[0088] The G pin of the third voltage comparator chip U3 is grounded, and the V pin of the third voltage comparator chip U3 is connected to the first end of the fifteenth resistor R15.

[0089] The second end of the fifteenth resistor R15 is connected to the first pin of the third voltage comparator chip U3 and the gate of the fifth NMOS transistor Q5, respectively.

[0090] The gate of the sixth PMOS transistor Q6 is connected to the second end of the sixteenth resistor R16 and the forty-seventh pin of the fourth microcontroller U4; the source of the sixth PMOS transistor Q6 is connected to the first end of the sixteenth resistor R16.

[0091] According to another aspect of the present invention, the following technical solution is adopted: a broadcasting system, the broadcasting system including the above-mentioned intelligent control system for audio speaker volume.

[0092] In one embodiment of the present invention, the broadcasting system further includes at least one loudspeaker and at least one audio amplifier, and the audio loudspeaker volume intelligent control system is connected to each audio amplifier and each loudspeaker respectively.

[0093] The beneficial effects of this invention are as follows: The intelligent audio speaker volume control system and broadcasting system proposed in this invention can adaptively adjust the broadcast volume according to the ambient noise level, providing listeners with a more complete listening experience.

[0094] In one application scenario of this invention, the intelligent volume control of the audio speaker utilizes sound reduction and energy storage technology in its power supply design to control the amount of sound energy. The intelligent volume control senses ambient noise, analyzes and processes it, and then controls the volume accordingly. This achieves adaptive adjustment of the CCTV Youth broadcast volume based on the ambient background noise level, ensuring broadcasts are delivered within a highly identifiable and suitable volume range for human hearing, providing passengers with the best listening experience. It is an intelligent broadcasting device that can achieve adaptive volume adjustment in public places by directly replacing existing equipment without rewiring. Attached Figure Description

[0095] Figure 1This is a schematic diagram of the composition of an intelligent audio speaker volume control system in one embodiment of the present invention.

[0096] Figure 2 This is a schematic diagram of the principle of an intelligent audio speaker volume control system in one embodiment of the present invention.

[0097] Figure 3 This is a schematic diagram of another component of the intelligent control system for audio speaker volume in one embodiment of the present invention.

[0098] Figure 4 This is a circuit diagram of the main control circuit in one embodiment of the present invention.

[0099] Figure 5 This is a circuit diagram of an environmental noise detection circuit in one embodiment of the present invention.

[0100] Figure 6 This is a circuit diagram of a power management circuit in one embodiment of the present invention.

[0101] Figure 7 This is a circuit diagram of an audio signal input receiving and adjustment circuit in one embodiment of the present invention.

[0102] Figure 8 This is a circuit diagram of an audio signal output power adjustment circuit in one embodiment of the present invention.

[0103] Figure 9 This is a circuit diagram of an audio signal input / output direct-through control circuit in one embodiment of the present invention. Detailed Implementation

[0104] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0105] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention.

[0106] The description in this section pertains to only a few typical embodiments, and the present invention is not limited to the scope of the embodiments described. Substitution of identical or similar prior art methods with some technical features in the embodiments is also within the scope of the description and protection of this invention.

[0107] The term "connection" in the instruction manual includes both direct and indirect connections.

[0108] This invention discloses an intelligent control system for audio speaker volume. Figure 1 This is a schematic diagram of the composition of an intelligent audio speaker volume control system according to an embodiment of the present invention; please refer to [link / reference]. Figure 1The volume intelligent control system includes: a main control circuit 1, an ambient noise detection circuit 2, a volume output power determination circuit 3, and an audio signal output power adjustment circuit 4; the main control circuit 1 is connected to the ambient noise detection circuit 2, the volume output power determination circuit 3, and the audio signal output power adjustment circuit 4 respectively.

[0109] The environmental noise detection circuit 2 is used to collect the noise value of the ambient environment. The environmental noise detection circuit sends the acquired environmental noise value to the main control circuit 1, and the main control circuit 1 sends the acquired noise value to the volume output power determination circuit. The volume output power determination circuit 3 is used to determine the volume output power of the speaker based on the ambient noise value. The volume output power determination circuit 3 sends the determined power data to the audio signal output power adjustment circuit 4 (the volume output power determination circuit 3 can send relevant data to the audio signal output power adjustment circuit 4 through the main control circuit 1, or it can send the relevant data directly to the audio signal output power adjustment circuit 4). Of course, the volume output power determination circuit 3 can also be part of the main control circuit 1. When the audio signal output power adjustment circuit 4 detects audio input, it modulates the input power of the audio speaker according to the determined output power to achieve intelligent volume control.

[0110] In one embodiment of the present invention, the volume intelligent control system further includes: a power management circuit 5, an audio signal input receiving and adjusting circuit 7, an audio signal input / output direct control circuit 8, and an audio signal output circuit 9; the main control circuit is connected to the power management circuit 5, the audio signal input receiving and adjusting circuit 7, and the audio signal input / output direct control circuit 8 respectively; the audio signal input receiving and adjusting circuit 7, the audio signal input / output direct control circuit 8, and the audio signal output circuit 9 are connected in sequence, and the audio signal input / output direct control circuit 8 and the audio signal output power adjustment circuit 4 are respectively connected to the audio signal output circuit 9.

[0111] The main function of the power management circuit 5 is to manage the energy input on the audio signal input line. When the lithium battery charging conditions are met, the controller's energy storage lithium battery is charged. When the energy of the energy storage lithium battery is insufficient to power the controller, the controller automatically enters sleep mode and stops controlling the audio signal.

[0112] The audio signal input receiving and adjustment circuit 7 generates a microcontroller input for broadcast interruption and a sound control signal sampling input for the original audio signal, and simultaneously filters, shapes, and reduces noise in the input audio signal.

[0113] The main function of the audio signal output circuit 8 is to adjust the output power of the audio signal according to the set adjustment power level, and to shape the audio signal before outputting it to the audio line.

[0114] The audio signal input / output direct control circuit 8 will be activated in two situations: one is when the controller receives a command to stop adjusting the audio power output, it will interrupt the power adjustment of the original audio signal and output the original input audio signal directly without adjustment; the other is when the energy storage lithium battery is insufficient to power the controller, it will automatically activate the audio signal input / output direct control circuit and output the original audio signal directly.

[0115] Figure 4 This is a circuit diagram of the main control circuit in one embodiment of the present invention; please refer to [link / reference]. Figure 4 In one embodiment of the present invention, the main control circuit includes a fourth microcontroller U4, a fifty-first resistor R51, a twenty-first indicator light D21, a forty-sixth resistor R46, a fifty-sixth resistor R56, and a second four-pin connector P2; the 44th pin of the fourth microcontroller U4 is connected to the first power supply voltage through the fifty-first resistor R51 and the twenty-first indicator light D21.

[0116] Pins 26, 27, 28, 33, 34, 45, and 46 of the fourth microcontroller U4 are connected to the audio signal output power adjustment circuit, respectively; pins PA0 and PA6 of the fourth microcontroller U4 are connected to the audio signal input receiving adjustment circuit, pins PA1 and PA4 of the fourth microcontroller U4 are connected to the ambient noise detection circuit, and pin 47 of the fourth microcontroller U4 is connected to the charging circuit.

[0117] Figure 7 This is a circuit diagram of an audio signal input receiving and adjustment circuit according to an embodiment of the present invention; please refer to [link / reference]. Figure 7 In one embodiment of the present invention, the audio signal input receiving and adjustment circuit includes a 21st resistor R21, a 31st rectifier diode D31, a 32nd resistor R32, a 25th Zener diode D25, a 19th capacitor C19, a 17th resistor R17, a 20th resistor R20, a 33rd resistor R33, and a 6th capacitor C6.

[0118] The first terminal of the 21st resistor R21 is connected to the first terminal of the 32nd resistor R32, and the second terminal of the 21st resistor R21 is grounded. The cathode of the 31st rectifier diode D31 is connected to the first terminal of the 20th resistor R20, the cathode of the 25th Zener diode D25, the first terminal of the 19th capacitor C19, the first terminal of the 17th resistor R17, and the first terminal of the 33rd resistor R33. The second terminal of the 20th resistor R20 is connected to pin PA6 of the fourth microcontroller U4, and the second terminal of the 33rd resistor R33 is connected to pin PA0 of the fourth microcontroller U4. The anode of the 25th Zener diode D25, the second terminal of the 19th capacitor C19, and the second terminal of the 17th resistor R17 are all grounded.

[0119] Figure 5 This is a circuit diagram of an environmental noise detection circuit according to one embodiment of the present invention; please refer to [link / reference]. Figure 5 In one embodiment of the present invention, the environmental noise detection circuit includes a first microphone MK1, a twenty-eighth resistor R28, a thirteenth capacitor C13, a twelfth capacitor C12, a twenty-ninth resistor R29, a thirty-fifth resistor R35, a second operational amplifier U2, a fourteenth rectifier diode D14, an eleventh capacitor C11, a twenty-sixth resistor R26, a thirty-first resistor R31, a fourteenth capacitor C14, a fifteenth capacitor C15, a fortieth resistor R40, a thirty-ninth capacitor R39, and an eighteenth capacitor C18.

[0120] The first terminal of the first microphone MK1 is connected to the first terminal of the twelfth capacitor C12, the first terminal of the thirteenth capacitor C13, and the second terminal of the twenty-eighth resistor R28. The second terminal of the first microphone MK1 is grounded, and the second terminal of the thirteenth capacitor C13 is grounded. The second terminal of the twelfth capacitor C12 is connected to the second terminal of the twenty-ninth resistor R29, the first terminal of the thirty-fifth resistor R35, and the non-inverting input terminal of the second operational amplifier U2. The second terminal of the thirty-fifth resistor R35 is grounded.

[0121] The inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the fifteenth capacitor C15, the second terminal of the thirty-ninth resistor R39, and the first terminal of the fortieth resistor R40, respectively. The first terminal of the thirty-ninth resistor R39 is connected to the second terminal of the eighteenth capacitor C18, and the first terminal of the eighteenth capacitor C18 is grounded. The output terminal of the second operational amplifier U2 is connected to the second terminal of the fifteenth capacitor C15, the second terminal of the fortieth resistor R40, the first terminal of the thirty-first resistor R31, and the positive terminal of the fourteenth rectifier diode D14, respectively.

[0122] The cathode of the fourteenth rectifier diode D14 is connected to the first terminal of the eleventh capacitor C11, the PA1 pin of the fourth microcontroller U4, and the first terminal of the twenty-sixth resistor R26; the second terminals of the eleventh capacitor C11 and the twenty-sixth resistor R26 are grounded. The second terminal of the thirty-first resistor R31 is connected to the first terminal of the fourteenth capacitor C14 and the PA4 pin of the fourth microcontroller U4; the second terminal of the fourteenth capacitor C14 is grounded.

[0123] Figure 6 This is a circuit diagram of a power management circuit in one embodiment of the present invention; please refer to [link / reference]. Figure 6 In one embodiment of the present invention, the power management circuit includes a first DC / DC converter U1, a fifth rectifier diode D5, a sixth rectifier diode D6, a seventh rectifier diode D7, an eighth rectifier diode D8, a seventh resistor R7, a zero-polarity capacitor C0, an eleventh Zener diode D11, a first capacitor C1, a tenth resistor R10, a second resistor R2, a sixth resistor R6, a first power inductor L1, a second capacitor C2, a fifth polarity capacitor C5, a first resistor R1, a fourth rectifier diode D4, a first rechargeable lithium battery BT1, a zero-polarity light-emitting diode D0, and a twenty-second light-emitting diode D22.

[0124] The IN pin of the first DC / DC converter U1 is connected to the negative terminal of the sixth rectifier diode D6, the negative terminal of the eighth rectifier diode D8, the first terminal of the seventh resistor R7, and the first terminal of the zero-polarity capacitor C0; the second terminal of the zero-polarity capacitor C0 is grounded. The EN pin of the first DC / DC converter U1 is connected to the second terminal of the seventh resistor R7 and the negative terminal of the eleventh Zener diode D11; the positive terminal of the eleventh Zener diode D11 is grounded.

[0125] The anode of the sixth rectifier diode D6 is connected to the cathode of the fifth rectifier diode D5, and the anode of the fifth rectifier diode D5 is grounded; the anode of the eighth rectifier diode D8 is connected to the cathode of the seventh rectifier diode D7, and the anode of the seventh rectifier diode D7 is grounded.

[0126] The BS pin of the first DC / DC converter U1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is connected to the sixth pin of the first DC / DC converter U1 and the first terminal of the first power inductor L1 respectively; the second terminal of the first power inductor L1 is connected to the first terminal of the second resistor R2, the first terminal of the second capacitor C2, and the first terminal of the first resistor R1 respectively.

[0127] The second pin of the first DC / DC converter U1 is grounded through the tenth resistor R10; the first pin of the first DC / DC converter U1 is connected to the first end of the sixth resistor R6, the second end of the second resistor R2, and the second end of the second capacitor C2 respectively; the second end of the sixth resistor R6 is grounded.

[0128] The second end of the first resistor R1 is connected to the positive terminal of the fourth rectifier diode D4. The negative terminal of the fourth rectifier diode D4 is connected to the positive terminal of the first rechargeable lithium battery BT1 and the positive terminal of the zeroth light-emitting diode D0. The negative terminal of the zeroth light-emitting diode D0 is connected to the positive terminal of the twenty-second light-emitting diode D22. The negative terminals of the twenty-second light-emitting diode D22 and the negative terminal of the first rechargeable lithium battery BT1 are grounded.

[0129] Figure 8 This is a circuit diagram of an audio signal output power adjustment circuit according to an embodiment of the present invention; please refer to [link / reference]. Figure 8 In one embodiment of the present invention, the audio signal output power adjustment circuit includes channel 0 / 0, channel 1 / 1, channel 1 / 2, channel 1 / 4, channel 1 / 8, and channel 1 / 16.

[0130] The 0 / 0 channel includes a 53rd resistor R53, a 23rd transistor Q23, a 54th resistor R54, and a 24th transistor Q24. The 46th pin of the fourth microcontroller U4 is connected to the first terminal of the 53rd resistor R53, and the second terminal of the 53rd resistor R53 is connected to the base of the 23rd transistor Q23; the emitter of the 23rd transistor Q23 is grounded. The 45th pin of the fourth microcontroller U4 is connected to the first terminal of the 54th resistor R54, and the second terminal of the 54th resistor R54 is connected to the base of the 24th transistor Q24; the emitter of the 24th transistor Q24 is grounded.

[0131] The first / 1 channel includes an eighth resistor R8, a third transistor Q3, a third capacitor C3, a ninth Zener diode D9, a first MOSFET Q1, a third resistor R3, a ninth resistor R9, a second MOSFET Q2, a twenty-fourth diode D24, a fourth capacitor C4, a fourth resistor R4, a thirty-second diode D32, a tenth Zener diode D10, a fifth resistor R5, an eleventh resistor R11, a fourth transistor Q4, and a twenty-sixth diode D26.

[0132] The 34th pin of the fourth microcontroller U4 is connected to the first terminal of the eighth resistor R8 and the first terminal of the eleventh resistor R11. The second terminal of the eighth resistor R8 is connected to the base of the third transistor Q3, and the emitter of the third transistor Q3 is grounded. The collector of the third transistor Q3 is connected to the first terminal of the third capacitor C3, the negative terminal of the ninth Zener diode D9, the gate of the first MOSFET Q1, and the first terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the negative terminal of the twenty-fourth diode D24, and the positive terminal of the twenty-fourth diode D24 is connected to the second power supply voltage.

[0133] The drain of the first MOSFET Q1 is connected to the first terminal of the ninth resistor R9; the second terminal of the third capacitor C3, the positive terminal of the ninth Zener diode D9, and the source of the first MOSFET Q1 are grounded. The second terminal of the ninth resistor R9 is connected to the drain of the second MOSFET Q2, and the gate of the second MOSFET Q2 is connected to the first terminal of the fourth resistor R4, the first terminal of the fourth capacitor C4, the negative terminal of the tenth Zener diode D10, and the first terminal of the fifth resistor R5.

[0134] The second terminal of the fourth resistor R4 is connected to the cathode of the thirty-second diode D32, and the anode of the thirty-second diode D32 is connected to the third power supply voltage. The source of the second MOSFET Q2 is connected to the second terminal of the fourth capacitor C4 and the anode of the tenth Zener diode D10 (which can be connected to the audio output port S4). The second terminal of the fifth resistor R5 is connected to the anode of the twenty-sixth diode D26. The second terminal of the eleventh resistor R11 is connected to the base of the fourth transistor Q4, the cathode of the twenty-sixth diode D26 is connected to the collector of the fourth transistor Q4, and the emitter of the fourth transistor Q4 is grounded.

[0135] The first / second channel includes the eighteenth resistor R18, the twenty-second resistor R22, the ninth transistor Q9, the thirteenth transistor Q10, the seventh capacitor C7, the twelfth Zener diode D12, the seventh MOSFET Q7, the twelfth resistor R12, the thirty-third diode D33, the nineteenth resistor R19, the eighth MOSFET Q8, the thirteenth resistor R13, the eighth capacitor C8, the thirty-fourth diode D34, the thirteenth Zener diode D13, the fourteenth resistor R14, and the twenty-seventh diode D27.

[0136] The 33rd pin of the fourth microcontroller U4 is connected to the first terminal of the 18th resistor R18 and the first terminal of the 22nd resistor R22. The second terminal of the 18th resistor R18 is connected to the base of the 9th transistor Q9, and the emitter of the 9th transistor Q9 is grounded. The collector of the 9th transistor Q9 is connected to the first terminal of the 7th capacitor C7, the negative terminal of the 12th Zener diode D12, the gate of the 7th MOSFET Q7, and the first terminal of the 12th resistor R12. The second terminal of the 12th resistor R12 is connected to the negative terminal of the 33rd diode D33, and the positive terminal of the 33rd diode D33 is connected to the second power supply voltage.

[0137] The drain of the seventh MOSFET Q7 is connected to the first terminal of the nineteenth resistor R19; the second terminal of the seventh capacitor C7, the positive terminal of the twelfth Zener diode D12, and the source of the seventh MOSFET Q7 are grounded. The second terminal of the nineteenth resistor R19 is connected to the drain of the eighth MOSFET Q8, and the gate of the eighth MOSFET Q8 is connected to the first terminal of the thirteenth resistor R13, the first terminal of the eighth capacitor C8, the negative terminal of the thirteenth Zener diode D13, and the first terminal of the fourteenth resistor R14.

[0138] The second terminal of the thirteenth resistor R13 is connected to the cathode of the thirty-fourth diode D34, and the anode of the thirty-fourth diode D34 is connected to the third power supply voltage. The source of the eighth MOSFET Q8 is connected to the second terminal of the eighth capacitor C8 and the anode of the thirteenth Zener diode D13. The second terminal of the fourteenth resistor R14 is connected to the anode of the twenty-seventh diode D27. The second terminal of the twenty-second resistor R22 is connected to the base of the thirteenth transistor Q10, the cathode of the twenty-seventh diode D27 is connected to the collector of the thirteenth transistor Q10, and the emitter of the thirteenth transistor Q10 is grounded.

[0139] The first / fourth channel includes the twenty-seventh resistor R27, the thirty-fourth resistor R34, the thirteenth transistor Q13, the fourteenth transistor Q14, the ninth capacitor C9, the fifteenth Zener diode D15, the eleventh MOSFET Q11, the twenty-third resistor R23, the thirty-fifth diode D35, the thirtieth resistor R30, the twelfth MOSFET Q12, the twenty-fourth resistor R24, the tenth capacitor C10, the thirty-sixth diode D36, the sixteenth Zener diode D16, the twenty-fifth resistor R25, and the twenty-eighth diode D28.

[0140] The 28th pin of the fourth microcontroller U4 is connected to the first terminal of the 27th resistor R27 and the first terminal of the 34th resistor R34. The second terminal of the 27th resistor R27 is connected to the base of the 13th transistor Q13, and the emitter of the 13th transistor Q13 is grounded. The collector of the 13th transistor Q13 is connected to the first terminal of the 9th capacitor C9, the negative terminal of the 15th Zener diode D15, the gate of the 11th MOSFET Q11, and the first terminal of the 23rd resistor R23. The second terminal of the 23rd resistor R23 is connected to the negative terminal of the 35th diode D35, and the positive terminal of the 35th diode D35 is connected to the second power supply voltage.

[0141] The drain of the eleventh MOSFET Q11 is connected to the first terminal of the thirtieth resistor R30; the second terminal of the ninth capacitor C9, the positive terminal of the fifteenth Zener diode D15, and the source of the eleventh MOSFET Q11 are respectively grounded.

[0142] The second end of the thirtieth resistor R30 is connected to the drain of the twelfth MOS transistor Q12, and the gate of the twelfth MOS transistor Q12 is connected to the first end of the twenty-fourth resistor R24, the first end of the tenth capacitor C10, the negative terminal of the sixteenth Zener diode D16, and the first end of the twenty-fifth resistor R25.

[0143] The second terminal of the 24th resistor R24 ​​is connected to the cathode of the 36th diode D36, and the anode of the 36th diode D36 is connected to the third power supply voltage. The source of the 12th MOSFET Q12 is connected to the second terminal of the 10th capacitor C10 and the anode of the 16th Zener diode D16. The second terminal of the 25th resistor R25 is connected to the anode of the 28th diode D28. The second terminal of the 34th resistor R34 is connected to the base of the 14th transistor Q14, the cathode of the 28th diode D28 is connected to the collector of the 14th transistor Q14, and the emitter of the 14th transistor Q14 is grounded.

[0144] The first / eighth channel includes the forty-first resistor R41, the forty-third resistor R43, the seventeenth transistor Q17, the eighteenth transistor Q18, the sixteenth capacitor C16, the seventeenth Zener diode D17, the fifteenth MOSFET Q15, the thirty-sixth resistor R36, the thirty-seventh diode D37, the forty-second resistor R42, the sixteenth MOSFET Q16, the thirty-seventh resistor R37, the seventeenth capacitor C17, the thirty-eighth diode D38, the eighteenth Zener diode D18, the thirty-eighth resistor R38, and the twenty-ninth diode D29.

[0145] The 27th pin of the fourth microcontroller U4 is connected to the first terminals of the 41st resistor R41 and the 43rd resistor R43. The second terminal of the 41st resistor R41 is connected to the base of the 17th transistor Q17, and the emitter of the 17th transistor Q17 is grounded. The collector of the 17th transistor Q17 is connected to the first terminal of the 16th capacitor C16, the negative terminal of the 17th Zener diode D17, the gate of the 15th MOSFET Q15, and the first terminal of the 36th resistor R36. The second terminal of the 36th resistor R36 is connected to the negative terminal of the 37th diode D37, and the anode of the 37th diode D37 is connected to the second power supply voltage. The drain of the 15th MOSFET Q15 is connected to the first terminal of the 42nd resistor R42. The second terminal of the 16th capacitor C16, the anode of the 17th Zener diode D17, and the source of the 15th MOSFET Q15 are all grounded.

[0146] The second terminal of the forty-second resistor R42 is connected to the drain of the sixteenth MOSFET Q16. The gate of the sixteenth MOSFET Q16 is connected to the first terminal of the thirty-seventh resistor R37, the first terminal of the seventeenth capacitor C17, the negative terminal of the eighteenth Zener diode D18, and the first terminal of the thirty-eighth resistor R38. The second terminal of the thirty-seventh resistor R37 is connected to the negative terminal of the thirty-eighth diode D38, and the positive terminal of the thirty-eighth diode D38 is connected to the third power supply voltage. The source of the sixteenth MOSFET Q16 is connected to the second terminal of the seventeenth capacitor C17 and the positive terminal of the eighteenth Zener diode D18. The second terminal of the thirty-eighth resistor R38 is connected to the positive terminal of the twenty-ninth diode D29. The second terminal of the forty-third resistor R43 is connected to the base of the eighteenth transistor Q18, the negative terminal of the twenty-ninth diode D29 is connected to the collector of the eighteenth transistor Q18, and the emitter of the eighteenth transistor Q18 is grounded.

[0147] The first / 16th channel includes the forty-eighth resistor R48, the fiftieth resistor R50, the twenty-first transistor Q21, the twenty-second transistor Q22, the twentieth capacitor C20, the nineteenth Zener diode D19, the nineteenth MOSFET Q19, the forty-fourth resistor R44, the thirty-ninth diode D39, the forty-ninth resistor R49, the twentieth MOSFET Q20, the forty-fifth resistor R45, the twenty-first capacitor C21, the fortieth diode D40, the twentieth Zener diode D20, the forty-seventh resistor R47, and the thirtieth diode D30.

[0148] The 26th pin of the fourth microcontroller U4 is connected to the first terminal of the 48th resistor R48 and the first terminal of the 50th resistor R50. The second terminal of the 48th resistor R48 is connected to the base of the 21st transistor Q21, and the emitter of the 21st transistor Q21 is grounded. The collector of the 21st transistor Q21 is connected to the first terminal of the 20th capacitor C20, the negative terminal of the 19th Zener diode D19, the gate of the 19th MOSFET Q19, and the first terminal of the 44th resistor R44. The second terminal of the 44th resistor R44 is connected to the negative terminal of the 39th diode D39, and the positive terminal of the 39th diode D39 is connected to the second power supply voltage.

[0149] The drain of the nineteenth MOSFET Q19 is connected to the first terminal of the forty-ninth resistor R49; the second terminal of the twentieth capacitor C20, the positive terminal of the nineteenth Zener diode D19, and the source of the nineteenth MOSFET Q19 are grounded respectively. The second terminal of the forty-ninth resistor R49 is connected to the drain of the twentieth MOSFET Q20, and the gate of the twentieth MOSFET Q20 is connected to the first terminal of the forty-fifth resistor R45, the first terminal of the twenty-first capacitor C21, the negative terminal of the twentieth Zener diode D20, and the first terminal of the forty-seventh resistor R47.

[0150] The second terminal of the forty-fifth resistor R45 is connected to the cathode of the fortieth diode D40, and the anode of the fortieth diode D40 is connected to the third power supply voltage. The source of the twentieth MOSFET Q20 is connected to the second terminal of the twenty-first capacitor C21 and the anode of the twentieth Zener diode D20, respectively. The second terminal of the forty-seventh resistor R47 is connected to the anode of the thirtieth diode D30. The second terminal of the fiftieth resistor R50 is connected to the base of the twenty-second transistor Q22, the cathode of the thirtieth diode D30 is connected to the collector of the twenty-second transistor Q22, and the emitter of the twenty-second transistor Q22 is grounded.

[0151] Figure 9 This is a circuit diagram of an audio signal input / output pass-through control circuit according to an embodiment of the present invention; please refer to [link / reference]. Figure 9 In one embodiment of the present invention, the audio signal input / output direct control circuit includes a third voltage comparator chip U3, a fifth NMOS transistor Q5, a sixth PMOS transistor Q6, a fifteenth resistor R15, and a sixteenth resistor R16.

[0152] The G pin of the third voltage comparator chip U3 is grounded, and the V pin of the third voltage comparator chip U3 is connected to the first end of the fifteenth resistor R15. The second end of the fifteenth resistor R15 is connected to the first pin of the third voltage comparator chip U3 and the gate of the fifth NMOS transistor Q5. The gate of the sixth PMOS transistor Q6 is connected to the second end of the sixteenth resistor R16 and the forty-seventh pin of the fourth microcontroller U4; the source of the sixth PMOS transistor Q6 is connected to the first end of the sixteenth resistor R16.

[0153] In one application scenario of this invention, if an extended period of no-broadcast charging occurs, the battery may be depleted due to power consumption from timed wake-up noise measurement. To ensure the battery stops discharging and to protect it, the following two steps are taken:

[0154] Step 1: The program detects the battery voltage. When the battery voltage drops below 3.0V, it controls the magnetic relay to switch to the initial state of direct connection with the speaker to ensure uninterrupted broadcasting.

[0155] Step 2: Using the output level of the voltage comparator of the third chip U3, when the battery is higher than 2.8V, the fifth NMOS transistor Q5 is turned on, and when the battery is lower than 2.7V, the fifth NMOS transistor Q5 is turned off, disconnecting the power supply to the microcontroller and the entire circuit.

[0156] The broadcast signal input receiving and adjustment circuit generates broadcast interruption input and sound control signal sampling input for microcontroller U4. D31 is a half-wave circuit, D25 is a 3.6V clipping circuit, and R20 is impedance matching. R17's function is to make the falling edge of the shaped audio pulse wave steeper; the smaller R17 is, the steeper the falling edge. Capacitor C19 is connected in parallel across R17 for filtering, mainly to remove glitches. C6 can reduce the sensitivity to interference in determining whether the broadcast is interrupted.

[0157] The principle of charging using broadcast sound energy is achieved by using a wide-voltage input DC-DC converter U1. First, its output voltage must be limited to 3.6V (the highest supply voltage of the microcontroller). After adjusting the voltage divider ratio of R2 and R6, its output voltage is calculated as follows: Vout = 0.6 * (1 + 49.9K / 10K) = 3.6V.

[0158] Additionally, considering the intermittent nature of broadcast signals and their significant amplitude fluctuations, U1 might continuously restart, causing surge voltages to momentarily exceed 3.6V. Even with broadcast charging, the voltage would still reach 3.8V. The solution is to connect two conducting LEDs, D0 and D22, in parallel across the battery terminals. This way, the high voltage is dissipated by brightening the LEDs, maintaining a stable output voltage of 3.4V. This protects the microcontroller U4 from damage and prevents overcharging of the battery.

[0159] The volume control circuit design involves first allowing the broadcast signal to pass through a 62K (2W) resistor, resulting in a minimum output volume of approximately 50dBm. Five I / O ports (pins 26, 27, 28, 33, and 34) of the microcontroller U4 are used. A "0" output from the microcontroller U4's I / O port selects the resistor for parallel connection, while a "1" output disconnects it. This allows for 32 possible parallel connection combinations, resulting in different parallel resistance values ​​to control the volume.

[0160] The present invention further discloses a broadcasting system, which includes the above-described intelligent audio speaker volume control system.

[0161] In one embodiment of the present invention, the broadcasting system further includes at least one loudspeaker and at least one audio amplifier, and the audio loudspeaker volume intelligent control system is connected to each audio amplifier and each loudspeaker respectively.

[0162] In summary, the intelligent audio speaker volume control system and broadcasting system proposed in this invention can adaptively adjust the broadcast volume according to the ambient noise level, providing listeners with a more complete listening experience.

[0163] In one application scenario of this invention, the intelligent volume control of the audio speaker utilizes sound reduction and energy storage technology in its power supply design to control the amount of sound energy. The intelligent volume control senses ambient noise, analyzes and processes it, and then controls the volume accordingly. This achieves adaptive adjustment of the CCTV Youth broadcast volume based on the ambient background noise level, ensuring broadcasts are delivered within a highly identifiable and suitable volume range for human hearing, providing passengers with the best listening experience. It is an intelligent broadcasting device that can achieve adaptive volume adjustment in public places by directly replacing existing equipment without rewiring.

[0164] It should be noted that this application can be implemented in software and / or a combination of software and hardware; for example, it can be implemented using an application-specific integrated circuit (ASIC), a general-purpose computer, or any other similar hardware device. In some embodiments, the software program of this application can be executed by a processor to implement the steps or functions described above. Similarly, the software program of this application (including related data structures) can be stored in a computer-readable recording medium; for example, RAM memory, magnetic or optical drives, floppy disks, and similar devices. In addition, some steps or functions of this application can be implemented in hardware; for example, as circuitry that cooperates with a processor to perform the various steps or functions.

[0165] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0166] The description and application of the present invention herein are illustrative and not intended to limit the scope of the invention to the embodiments described above. Effects or advantages involved in the embodiments may not be apparent due to various factors, and the description of effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and various substitutions and equivalents of the components in the embodiments are well known to those skilled in the art. It should be apparent to those skilled in the art that the invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts without departing from the spirit or essential characteristics of the invention. Other variations and modifications can be made to the embodiments disclosed herein without departing from the scope and spirit of the invention.

Claims

1. An intelligent control system for audio speaker volume, characterized in that, The volume intelligent control system includes: a main control circuit, an environmental noise detection circuit, a volume output power determination circuit, and an audio signal output power adjustment circuit. The main control circuit is connected to the ambient noise detection circuit, the volume output power determination circuit, and the audio signal output power adjustment circuit, respectively. The environmental noise detection circuit is used to collect the noise value of the on-site environment. The environmental noise detection circuit sends the acquired environmental noise value to the main control circuit. The main control circuit sends the acquired noise value to the volume output power determination circuit. The volume output power determination circuit is used to determine the volume output power of the speaker based on the noise level of the ambient environment. The volume output power determination circuit sends the determined power data to the audio signal output power adjustment circuit. When the audio signal output power adjustment circuit detects audio input, it modulates the input power of the audio speaker according to the determined output power to achieve intelligent volume control. The volume intelligent control system further includes: a power management circuit, an audio signal input receiving and adjustment circuit, an audio signal output circuit, and an audio signal input and output direct control circuit. The main control circuit is connected to the power management circuit, the audio signal input receiving and adjustment circuit, the audio signal output circuit, and the audio signal input and output direct control circuit, respectively. The power management circuit is used to manage the energy input on the audio signal input line. When the lithium battery charging conditions are met, the controller's energy storage lithium battery is charged. When the energy of the lithium battery is insufficient to power the controller of the main control circuit, the controller automatically enters sleep mode and stops controlling the audio signal. The audio signal input receiving and adjustment circuit is used to generate microcontroller broadcast interrupt input and voice control signal sampling input for the original audio signal input, and at the same time to filter, shape and reduce noise of the input audio signal. The audio signal output circuit is used to adjust the output power of the audio signal according to the set adjustment power level, and to shape the audio signal before outputting it to the audio line. The audio signal input / output pass-through control circuit is activated in two situations: one is when the controller receives a command to stop adjusting the audio power output, it will interrupt the power adjustment of the original audio signal and directly output the original input audio signal without adjustment; the other is when the energy storage lithium battery is insufficient to power the controller, it will automatically activate the audio signal input / output pass-through control circuit and directly output the original audio signal. The audio signal output power adjustment circuit includes channel 0 / 0, channel 1 / 1, channel 1 / 2, channel 1 / 4, channel 1 / 8, and channel 1 / 16.

2. The intelligent audio speaker volume control system according to claim 1, characterized in that: The 0 / 0 channel includes the 53rd resistor R53, the 23rd transistor Q23, the 54th resistor R54, and the 24th transistor Q24; The 46th pin of the fourth microcontroller U4 is connected to the first end of the 53rd resistor R53, and the second end of the 53rd resistor R53 is connected to the base of the 23rd transistor Q23; the emitter of the 23rd transistor Q23 is grounded. The forty-fifth pin of the fourth microcontroller U4 is connected to the first end of the fifty-fourth resistor R54, and the second end of the fifty-fourth resistor R54 is connected to the base of the twenty-fourth transistor Q24; the emitter of the twenty-fourth transistor Q24 is grounded. The first / 1 channel includes an eighth resistor R8, a third transistor Q3, a third capacitor C3, a ninth Zener diode D9, a first MOSFET Q1, a third resistor R3, a ninth resistor R9, a second MOSFET Q2, a twenty-fourth diode D24, a fourth capacitor C4, a fourth resistor R4, a thirty-second diode D32, a tenth Zener diode D10, a fifth resistor R5, an eleventh resistor R11, a fourth transistor Q4, and a twenty-sixth diode D26; The 34th pin of the fourth microcontroller U4 is connected to the first end of the eighth resistor R8 and the first end of the eleventh resistor R11, respectively. The second end of the eighth resistor R8 is connected to the base of the third transistor Q3, and the emitter of the third transistor Q3 is grounded. The collector of the third transistor Q3 is connected to the first terminal of the third capacitor C3, the negative terminal of the ninth Zener diode D9, the gate of the first MOSFET Q1, and the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the negative terminal of the twenty-fourth diode D24, and the positive terminal of the twenty-fourth diode D24 is connected to the second power supply voltage. The drain of the first MOSFET Q1 is connected to the first terminal of the ninth resistor R9; the second terminal of the third capacitor C3, the positive terminal of the ninth Zener diode D9, and the source of the first MOSFET Q1 are respectively grounded; The second end of the ninth resistor R9 is connected to the drain of the second MOS transistor Q2, and the gate of the second MOS transistor Q2 is connected to the first end of the fourth resistor R4, the first end of the fourth capacitor C4, the negative terminal of the tenth Zener diode D10, and the first end of the fifth resistor R5. The second terminal of the fourth resistor R4 is connected to the negative terminal of the thirty-second diode D32, and the positive terminal of the thirty-second diode D32 is connected to the third power supply voltage. The source of the second MOSFET Q2 is connected to the second terminal of the fourth capacitor C4 and the positive terminal of the tenth Zener diode D10; the second terminal of the fifth resistor R5 is connected to the positive terminal of the twenty-sixth diode D26. The second end of the eleventh resistor R11 is connected to the base of the fourth transistor Q4, the cathode of the twenty-sixth diode D26 is connected to the collector of the fourth transistor Q4, and the emitter of the fourth transistor Q4 is grounded. The first / second channel includes the eighteenth resistor R18, the twenty-second resistor R22, the ninth transistor Q9, the thirteenth transistor Q10, the seventh capacitor C7, the twelfth Zener diode D12, the seventh MOSFET Q7, the twelfth resistor R12, the thirty-third diode D33, the nineteenth resistor R19, the eighth MOSFET Q8, the thirteenth resistor R13, the eighth capacitor C8, the thirty-fourth diode D34, the thirteenth Zener diode D13, the fourteenth resistor R14, and the twenty-seventh diode D27; The 33rd pin of the fourth microcontroller U4 is connected to the first end of the 18th resistor R18 and the first end of the 22nd resistor R22, respectively. The second end of the eighteenth resistor R18 is connected to the base of the ninth transistor Q9, and the emitter of the ninth transistor Q9 is grounded. The collector of the ninth transistor Q9 is connected to the first terminal of the seventh capacitor C7, the negative terminal of the twelfth Zener diode D12, the gate of the seventh MOSFET Q7, and the first terminal of the twelfth resistor R12; the second terminal of the twelfth resistor R12 is connected to the negative terminal of the thirty-third diode D33, and the positive terminal of the thirty-third diode D33 is connected to the second power supply voltage. The drain of the seventh MOSFET Q7 is connected to the first terminal of the nineteenth resistor R19; the second terminal of the seventh capacitor C7, the positive terminal of the twelfth Zener diode D12, and the source of the seventh MOSFET Q7 are respectively grounded; The second end of the nineteenth resistor R19 is connected to the drain of the eighth MOS transistor Q8, and the gate of the eighth MOS transistor Q8 is connected to the first end of the thirteenth resistor R13, the first end of the eighth capacitor C8, the negative terminal of the thirteenth Zener diode D13, and the first end of the fourteenth resistor R14. The second terminal of the thirteenth resistor R13 is connected to the negative terminal of the thirty-fourth diode D34, and the positive terminal of the thirty-fourth diode D34 is connected to the third power supply voltage. The source of the eighth MOSFET Q8 is connected to the second terminal of the eighth capacitor C8 and the positive terminal of the thirteenth Zener diode D13; the second terminal of the fourteenth resistor R14 is connected to the positive terminal of the twenty-seventh diode D27. The second end of the 22nd resistor R22 is connected to the base of the 13th transistor Q10, the cathode of the 27th diode D27 is connected to the collector of the 13th transistor Q10, and the emitter of the 13th transistor Q10 is grounded. The first / fourth channel includes the twenty-seventh resistor R27, the thirty-fourth resistor R34, the thirteenth transistor Q13, the fourteenth transistor Q14, the ninth capacitor C9, the fifteenth Zener diode D15, the eleventh MOSFET Q11, the twenty-third resistor R23, the thirty-fifth diode D35, the thirtieth resistor R30, the twelfth MOSFET Q12, the twenty-fourth resistor R24, the tenth capacitor C10, the thirty-sixth diode D36, the sixteenth Zener diode D16, the twenty-fifth resistor R25, and the twenty-eighth diode D28; The 28th pin of the fourth microcontroller U4 is connected to the first end of the 27th resistor R27 and the first end of the 34th resistor R34, respectively. The second end of the 27th resistor R27 is connected to the base of the 13th transistor Q13, and the emitter of the 13th transistor Q13 is grounded; The collector of the thirteenth transistor Q13 is connected to the first terminal of the ninth capacitor C9, the negative terminal of the fifteenth Zener diode D15, the gate of the eleventh MOSFET Q11, and the first terminal of the twenty-third resistor R23; the second terminal of the twenty-third resistor R23 is connected to the negative terminal of the thirty-fifth diode D35, and the positive terminal of the thirty-fifth diode D35 is connected to the second power supply voltage. The drain of the eleventh MOSFET Q11 is connected to the first terminal of the thirtieth resistor R30; the second terminal of the ninth capacitor C9, the positive terminal of the fifteenth Zener diode D15, and the source of the eleventh MOSFET Q11 are respectively grounded. The second end of the thirtieth resistor R30 is connected to the drain of the twelfth MOS transistor Q12, and the gate of the twelfth MOS transistor Q12 is connected to the first end of the twenty-fourth resistor R24, the first end of the tenth capacitor C10, the negative terminal of the sixteenth Zener diode D16, and the first end of the twenty-fifth resistor R25. The second terminal of the 24th resistor R24 ​​is connected to the negative terminal of the 36th diode D36, and the positive terminal of the 36th diode D36 is connected to the third power supply voltage. The source of the twelfth MOSFET Q12 is connected to the second terminal of the tenth capacitor C10 and the positive terminal of the sixteenth Zener diode D16; the second terminal of the twenty-fifth resistor R25 is connected to the positive terminal of the twenty-eighth diode D28. The second end of the thirty-fourth resistor R34 is connected to the base of the fourteenth transistor Q14, the negative terminal of the twenty-eighth diode D28 is connected to the collector of the fourteenth transistor Q14, and the emitter of the fourteenth transistor Q14 is grounded. The first / eighth channel includes resistor R41 (41st), resistor R43 (43rd), transistor Q17 (17th), transistor Q18 (18th), capacitor C16 (16th), Zener diode D17 (17th), MOSFET Q15 (15th), resistor R36 (36th), diode D37 (37th), resistor R42 (42nd), MOSFET Q16 (16th), resistor R37 (37th), capacitor C17 (17th), diode D38 (38th), Zener diode D18 (18th), resistor R38 (38th), and diode D29 (29th). The 27th pin of the fourth microcontroller U4 is connected to the first end of the 41st resistor R41 and the first end of the 43rd resistor R43, respectively. The second end of the forty-first resistor R41 is connected to the base of the seventeenth transistor Q17, and the emitter of the seventeenth transistor Q17 is grounded. The collector of the seventeenth transistor Q17 is connected to the first terminal of the sixteenth capacitor C16, the negative terminal of the seventeenth Zener diode D17, the gate of the fifteenth MOSFET Q15, and the first terminal of the thirty-sixth resistor R36; the second terminal of the thirty-sixth resistor R36 is connected to the negative terminal of the thirty-seventh diode D37, and the positive terminal of the thirty-seventh diode D37 is connected to the second power supply voltage. The drain of the fifteenth MOSFET Q15 is connected to the first terminal of the forty-second resistor R42; the second terminal of the sixteenth capacitor C16, the positive terminal of the seventeenth Zener diode D17, and the source of the fifteenth MOSFET Q15 are respectively grounded. The second end of the forty-second resistor R42 is connected to the drain of the sixteenth MOS transistor Q16, and the gate of the sixteenth MOS transistor Q16 is connected to the first end of the thirty-seventh resistor R37, the first end of the seventeenth capacitor C17, the negative terminal of the eighteenth Zener diode D18, and the first end of the thirty-eighth resistor R38. The second terminal of the thirty-seventh resistor R37 is connected to the negative terminal of the thirty-eighth diode D38, and the positive terminal of the thirty-eighth diode D38 is connected to the third power supply voltage. The source of the sixteenth MOSFET Q16 is connected to the second terminal of the seventeenth capacitor C17 and the positive terminal of the eighteenth Zener diode D18; the second terminal of the thirty-eighth resistor R38 is connected to the positive terminal of the twenty-ninth diode D29. The second end of the forty-third resistor R43 is connected to the base of the eighteenth transistor Q18, the cathode of the twenty-ninth diode D29 is connected to the collector of the eighteenth transistor Q18, and the emitter of the eighteenth transistor Q18 is grounded. The first / 16th channel includes the forty-eighth resistor R48, the fiftieth resistor R50, the twenty-first transistor Q21, the twenty-second transistor Q22, the twentieth capacitor C20, the nineteenth Zener diode D19, the nineteenth MOSFET Q19, the forty-fourth resistor R44, the thirty-ninth diode D39, the forty-ninth resistor R49, the twentieth MOSFET Q20, the forty-fifth resistor R45, the twenty-first capacitor C21, the fortieth diode D40, the twentieth Zener diode D20, the forty-seventh resistor R47, and the thirtieth diode D30; The 26th pin of the fourth microcontroller U4 is connected to the first end of the 48th resistor R48 and the first end of the 50th resistor R50, respectively. The second end of the forty-eighth resistor R48 is connected to the base of the twenty-first transistor Q21, and the emitter of the twenty-first transistor Q21 is grounded; The collector of the 21st transistor Q21 is connected to the first terminal of the 20th capacitor C20, the negative terminal of the 19th Zener diode D19, the gate of the 19th MOSFET Q19, and the first terminal of the 44th resistor R44; the second terminal of the 44th resistor R44 is connected to the negative terminal of the 39th diode D39, and the positive terminal of the 39th diode D39 is connected to the second power supply voltage. The drain of the nineteenth MOSFET Q19 is connected to the first terminal of the forty-ninth resistor R49; the second terminal of the twentieth capacitor C20, the positive terminal of the nineteenth Zener diode D19, and the source of the nineteenth MOSFET Q19 are respectively grounded. The second end of the forty-ninth resistor R49 is connected to the drain of the twentieth MOS transistor Q20, and the gate of the twentieth MOS transistor Q20 is connected to the first end of the forty-fifth resistor R45, the first end of the twenty-first capacitor C21, the negative terminal of the twentieth Zener diode D20, and the first end of the forty-seventh resistor R47. The second terminal of the forty-fifth resistor R45 is connected to the negative terminal of the fortieth diode D40, and the positive terminal of the fortieth diode D40 is connected to the third power supply voltage. The source of the twentieth MOSFET Q20 is connected to the second terminal of the twenty-first capacitor C21 and the positive terminal of the twentieth Zener diode D20, respectively; the second terminal of the forty-seventh resistor R47 is connected to the positive terminal of the thirtieth diode D30. The second end of the fiftieth resistor R50 is connected to the base of the twenty-second transistor Q22, the cathode of the thirtieth diode D30 is connected to the collector of the twenty-second transistor Q22, and the emitter of the twenty-second transistor Q22 is grounded.

3. The intelligent audio speaker volume control system according to claim 1, characterized in that: The main control circuit includes a fourth microcontroller U4, a fifty-first resistor R51, a twenty-first indicator light D21, a forty-sixth resistor R46, a fifty-sixth resistor R56, and a second four-pin connector P2; pin 44 of the fourth microcontroller U4 is connected to the first power supply voltage through the fifty-first resistor R51 and the twenty-first indicator light D21. Pins 26, 27, 28, 33, 34, 45, and 46 of the fourth microcontroller U4 are connected to the audio signal output power adjustment circuit, respectively; pins PA0 and PA6 of the fourth microcontroller U4 are connected to the audio signal input receiving adjustment circuit. The PA1 and PA4 pins of the fourth microcontroller U4 are connected to the environmental noise detection circuit, and the 47th pin of the fourth microcontroller U4 is connected to the charging circuit.

4. The intelligent audio speaker volume control system according to claim 3, characterized in that: The audio signal input receiving and adjustment circuit includes a 21st resistor R21, a 31st rectifier diode D31, a 32nd resistor R32, a 25th Zener diode D25, a 19th capacitor C19, a 17th resistor R17, a 20th resistor R20, a 33rd resistor R33, and a 6th capacitor C6. The first end of the 21st resistor R21 is connected to the first end of the 32nd resistor R32, and the second end of the 21st resistor R21 is grounded. The negative terminal of the thirty-first rectifier diode D31 is connected to the first terminal of the twentieth resistor R20, the negative terminal of the twenty-fifth Zener diode D25, the first terminal of the nineteenth capacitor C19, the first terminal of the seventeenth resistor R17, and the first terminal of the thirty-third resistor R33. The second end of the twentieth resistor R20 is connected to the PA6 pin of the fourth microcontroller U4, the second end of the thirtieth resistor R33 is connected to the PA0 pin of the fourth microcontroller U4, and the positive terminal of the twentieth Zener diode D25, the second end of the nineteenth capacitor C19, and the second end of the seventeenth resistor R17 are grounded respectively.

5. The intelligent audio speaker volume control system according to claim 1, characterized in that: The environmental noise detection circuit includes a first microphone MK1, a twenty-eighth resistor R28, a thirteenth capacitor C13, a twelfth capacitor C12, a twenty-ninth resistor R29, a thirty-fifth resistor R35, a second operational amplifier U2, a fourteenth rectifier diode D14, an eleventh capacitor C11, a twenty-sixth resistor R26, a thirty-first resistor R31, a fourteenth capacitor C14, a fifteenth capacitor C15, a fortieth resistor R40, a thirty-ninth capacitor R39, and an eighteenth capacitor C18. The first end of the first microphone MK1 is connected to the first end of the twelfth capacitor C12, the first end of the thirteenth capacitor C13, and the second end of the twenty-eighth resistor R28. The second end of the first microphone MK1 is grounded, and the second end of the thirteenth capacitor C13 is grounded. The second terminal of the twelfth capacitor C12 is connected to the second terminal of the twenty-ninth resistor R29, the first terminal of the thirty-fifth resistor R35, and the non-inverting input terminal of the second operational amplifier U2; the second terminal of the thirty-fifth resistor R35 is grounded. The inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the fifteenth capacitor C15, the second terminal of the thirty-ninth resistor R39, and the first terminal of the fortieth resistor R40, respectively; the first terminal of the thirty-ninth resistor R39 is connected to the second terminal of the eighteenth capacitor C18, and the first terminal of the eighteenth capacitor C18 is grounded. The output terminal of the second operational amplifier U2 is connected to the second terminal of the fifteenth capacitor C15, the second terminal of the fortieth resistor R40, the first terminal of the thirty-first resistor R31, and the positive terminal of the fourteenth rectifier diode D14, respectively. The negative terminal of the fourteenth rectifier diode D14 is connected to the first terminal of the eleventh capacitor C11, the PA1 pin of the fourth microcontroller U4, and the first terminal of the twenty-sixth resistor R26; the second terminal of the eleventh capacitor C11 and the second terminal of the twenty-sixth resistor R26 are grounded respectively. The second end of the thirty-first resistor R31 is connected to the first end of the fourteenth capacitor C14 and the PA4 pin of the fourth microcontroller U4, respectively; the second end of the fourteenth capacitor C14 is grounded.

6. The intelligent audio speaker volume control system according to claim 3, characterized in that: The power management circuit includes a first DC / DC converter U1, a fifth rectifier diode D5, a sixth rectifier diode D6, a seventh rectifier diode D7, an eighth rectifier diode D8, a seventh resistor R7, a zero-polarity capacitor C0, an eleventh Zener diode D11, a first capacitor C1, a tenth resistor R10, a second resistor R2, a sixth resistor R6, a first power inductor L1, a second capacitor C2, a fifth polarity capacitor C5, a first resistor R1, a fourth rectifier diode D4, a first rechargeable lithium battery BT1, a zero-polarity light-emitting diode D0, and a twenty-second light-emitting diode D22. The IN pin of the first DC / DC converter U1 is connected to the negative terminal of the sixth rectifier diode D6, the negative terminal of the eighth rectifier diode D8, the first terminal of the seventh resistor R7, and the first terminal of the zero-polarity capacitor C0, respectively; the second terminal of the zero-polarity capacitor C0 is grounded. The EN pin of the first DC / DC converter U1 is connected to the second terminal of the seventh resistor R7 and the negative terminal of the eleventh Zener diode D11, respectively; the positive terminal of the eleventh Zener diode D11 is grounded. The anode of the sixth rectifier diode D6 is connected to the cathode of the fifth rectifier diode D5, and the anode of the fifth rectifier diode D5 is grounded; the anode of the eighth rectifier diode D8 is connected to the cathode of the seventh rectifier diode D7, and the anode of the seventh rectifier diode D7 is grounded. The BS pin of the first DC / DC converter U1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is connected to the sixth pin of the first DC / DC converter U1 and the first terminal of the first power inductor L1 respectively; the second terminal of the first power inductor L1 is connected to the first terminal of the second resistor R2, the first terminal of the second capacitor C2, and the first terminal of the first resistor R1 respectively. The second pin of the first DC / DC converter U1 is grounded through the tenth resistor R10; the first pin of the first DC / DC converter U1 is connected to the first end of the sixth resistor R6, the second end of the second resistor R2, and the second end of the second capacitor C2 respectively; the second end of the sixth resistor R6 is grounded. The second end of the first resistor R1 is connected to the positive terminal of the fourth rectifier diode D4. The negative terminal of the fourth rectifier diode D4 is connected to the positive terminal of the first rechargeable lithium battery BT1 and the positive terminal of the zeroth light-emitting diode D0. The negative terminal of the zeroth light-emitting diode D0 is connected to the positive terminal of the twenty-second light-emitting diode D22. The negative terminals of the twenty-second light-emitting diode D22 and the negative terminal of the first rechargeable lithium battery BT1 are grounded.

7. The intelligent audio speaker volume control system according to claim 1, characterized in that: The audio signal input / output pass-through control circuit includes a third voltage comparator chip U3, a fifth NMOS transistor Q5, a sixth PMOS transistor Q6, a fifteenth resistor R15, and a sixteenth resistor R16; The G pin of the third voltage comparator chip U3 is grounded, and the V pin of the third voltage comparator chip U3 is connected to the first end of the fifteenth resistor R15. The second end of the fifteenth resistor R15 is connected to the first pin of the third voltage comparator chip U3 and the gate of the fifth NMOS transistor Q5, respectively. The gate of the sixth PMOS transistor Q6 is connected to the second end of the sixteenth resistor R16 and the forty-seventh pin of the fourth microcontroller U4; the source of the sixth PMOS transistor Q6 is connected to the first end of the sixteenth resistor R16.

8. A broadcasting system, characterized in that: The broadcasting system includes the audio speaker volume intelligent control system as described in any one of claims 1 to 7.

9. The broadcasting system according to claim 8, characterized in that: The broadcasting system further includes at least one speaker and at least one audio amplifier, and the intelligent audio speaker volume control system is connected to each audio amplifier and each speaker respectively.

Images