Marine microphone control circuit and marine electronic equipment

Abstract

The utility model discloses a marine microphone control circuit and a marine electronic device. The marine microphone control circuit comprises a first power supply, a first current limiting module, a voltage stabilizing module, a mechanical button, a voltage detection module and a control module. The voltage stabilizing module is used for stabilizing the voltage of the microphone; the mechanical key is used for powering on the microphone when being switched on and powering off the microphone when being switched off; and the control module outputs a voice signal to the microphone when detecting that the mechanical key is switched on, and stops outputting the voice signal to the microphone when detecting that the mechanical key is switched off. According to the technical scheme, by integrating the voltage detection module and the control module, accurate control over microphone voice signals is achieved, and when the mechanical key is switched on, the circuit can rapidly detect and start voice signal output; and when the mechanical key is loosened, the microphone is powered off, so that noise interference caused by mechanical springback when the key is loosened is effectively eliminated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of marine electronic technology especially relates to a marine microphone control circuit and marine electronic equipment. BACKGROUND

[0002] VHF marine radio is indispensable communication equipment on modern ships, which undertakes the task of voice communication between ships and between ships and shore stations. It not only plays an important role in daily navigation, port scheduling, maritime supervision and other aspects, but also is crucial in emergency rescue, ship avoidance and other safety operations in emergency situations. Especially in complex maritime traffic environment, VHF radio provides a reliable communication means for ships and is a key equipment to ensure safe navigation and smooth operation.

[0003] At present, the handheld microphone terminal equipment of VHF marine radio generally uses mechanical buttons to start the transmitting function. During use, the cabin personnel needs to press the button on the microphone to start the transmitting function, convert the voice signal into an electrical signal through the microphone, and transmit it after modulation and amplification through the radio frequency circuit. However, there is a common problem with existing microphone terminal equipment: when the driver finishes speaking and releases the button, the plastic part of the microphone shell will produce a "bang" sound due to mechanical rebound. This unnecessary noise will be transmitted into the audio signal through the microphone, affecting the clear reception of the receiving party, especially in noisy or critical situations, this noise may interfere with the communication effect. Therefore, how to effectively eliminate or suppress the noise generated by mechanical rebound, especially to improve the communication quality in harsh environments, has become a problem to be solved in current VHF radio technology. SUMMARY

[0004] The utility model embodiment provides a kind of marine microphone control circuit and marine electronic equipment to solve above-mentioned technical problem.

[0005] The utility model embodiment first aspect provides a kind of marine microphone control circuit, comprising:

[0006] First power supply;

[0007] First current limiting module, its first end is connected with the first power supply;

[0008] Voltage stabilizing module, its first end is connected with the second end of the first current limiting resistor and the first end of the microphone respectively, its second end is connected with the second end of the microphone, for voltage stabilizing to the microphone;

[0009] Mechanical button, its first end is connected with the second end of the microphone, and its second end is grounded;

[0010] a voltage detection module, a first end of which is connected to the first power supply, a second end of which is connected to a second end of the microphone, and a third end of which is used for outputting a first voltage from the third end when the mechanical button is turned on and outputting a second voltage from the third end when the mechanical button is turned off;

[0011] a control module, a voice signal output end of which is connected to a first end of the microphone, and a signal detection end of which is connected to the third end of the voltage detection module, and which is used for outputting a voice signal to the microphone when the mechanical button is turned on through the first voltage and stopping outputting the voice signal to the microphone when the mechanical button is turned off through the second voltage.

[0012] Optionally, the first current limiting module comprises a first resistor, a third resistor and a first capacitor, a first end of the first resistor is the first end of the first current limiting module, a second end of the first resistor is connected to a first end of the first capacitor and a first end of the third resistor respectively, and a second end of the first capacitor and a second end of the third resistor are the second end of the first current limiting module.

[0013] Optionally, the voltage stabilizing module comprises a third capacitor, a first end of the third capacitor is the first end of the voltage stabilizing module, and a second end of the third capacitor is the second end of the voltage stabilizing module.

[0014] Optionally, the voltage detection module comprises a second resistor and a fourth resistor, a first end of the second resistor is the first end of the voltage detection module, a second end of the second resistor and a first end of the fourth resistor are connected to the third end of the voltage detection module, and a second end of the fourth resistor is the second end of the voltage detection module.

[0015] Optionally, the marine microphone control circuit further comprises a second capacitor, a first end of the second capacitor is connected to the first end of the microphone, and a second end of the second capacitor is connected to an output end of the control module.

[0016] Optionally, the marine microphone control circuit further comprises a temperature and humidity sensor module, a temperature and humidity signal processing module, a gain module, a voltage stabilizing temperature compensation module and a filter dynamic adjustment module.

[0017] The temperature and humidity sensor module is connected to the temperature and humidity signal processing module, the temperature and humidity signal processing module is connected to the control module, the control module is connected to the gain module, the gain module is connected to the voltage stabilizing temperature compensation module, and the voltage stabilizing temperature compensation module is connected to the filter dynamic adjustment module.

[0018] The utility model embodiment second aspect provides a kind of marine electronic equipment, comprising the marine microphone control circuit and fog horn of first aspect described.

[0019] The technical effect of the utility model embodiment is: through the integrated voltage detection module and control module, the accurate control of the microphone voice signal is realized, when the mechanical key is turned on, the circuit can quickly detect and enable the voice signal output; when the mechanical key is released, the microphone is powered off, thereby effectively eliminating the noise interference caused by mechanical rebound when the key is released, not only improving the communication sound quality, ensuring the clear hearing of the receiving party, but also significantly enhancing the reliability and user experience of ship communication, meeting the demand of ship for high-quality communication in complex marine environment. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will briefly introduce the drawings needed to be used in the description of the utility model embodiment, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0021] Figure 1 It is a structural schematic diagram of a marine microphone control circuit provided by the utility model embodiment one;

[0022] Figure 2 It is a circuit diagram of a marine microphone control circuit provided by the utility model embodiment one;

[0023] Figure 3 It is another structural schematic diagram of a marine microphone control circuit provided by the utility model embodiment one;

[0024] In the drawing: 10, microphone;101, first power supply;102, first current limiting module;103, voltage stabilizing module;104, mechanical key;105, voltage detection module;106, control module;201, temperature and humidity sensor module;202, temperature and humidity signal processing module;203, gain module;204, voltage stabilizing temperature compensation module;205, filter dynamic adjustment module. DETAILED DESCRIPTION

[0025] The technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings in the utility model embodiment, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] It is to be understood that the present application can be carried out in various forms and should not be construed to be limited to the examples set forth herein; rather, these examples are provided so that this disclosure will be complete and fully convey the scope of the application to those skilled in the art. In the drawings, the size and relative sizes of layers and regions can be exaggerated for clarity.

[0027] It will be understood that when an element or layer is referred to as being "on" or "adjacent" or "connected" or "coupled" to another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer or one or more intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on," "directly adjacent," "directly connected" or "directly coupled" to another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0028] For a thorough understanding of the present application, reference should be made to the following detailed description together with the accompanying drawings, in which:

[0029] Embodiment One

[0030] The present embodiment one provides a marine microphone control circuit, as shown in the accompanying drawings, comprising: Figure 1

[0031] a first power supply 101;

[0032] a first current limiting module 102, a first end of which is connected to the first power supply 101;

[0033] a voltage stabilizing module 103, a first end of which is connected to a second end of the first current limiting module 102 and a first end of the microphone 10 respectively, and a second end of which is connected to a second end of the microphone 10, for stabilizing voltage of the microphone 10;

[0034] a mechanical button 104, a first end of which is connected to the second end of the microphone 10, and a second end of which is grounded, for powering on the microphone when turned on, and powering off the microphone when turned off;

[0035] ​a voltage detection module 105, a first end of which is connected to the first power supply 101, a second end of which is connected to the second end of the microphone 10, for outputting a first voltage from a third end when the mechanical button 104 is turned on, and outputting a second voltage from the third end when the mechanical button 104 is turned off;

[0036] a control module 106, a voice signal output end of which is connected to the first end of the microphone 10, a signal detection end of which is connected to the third end of the voltage detection module 105, for outputting a voice signal to the microphone 10 when the mechanical button 104 is turned on by detecting the first voltage, and stopping outputting the voice signal to the microphone 10 when the mechanical button 104 is turned off by detecting the second voltage.

[0037] The marine microphone control circuit aims to effectively control the voice signal output of the microphone 10 and solve the noise problem caused by the release of the mechanical button 104. The functions of each module are as follows: The first power supply 101 provides power to each module of the circuit, ensuring the normal operation of the circuit. The first power supply 101 provides stable DC power to the rest of the circuit, ensuring the normal operation of the voltage stabilizing module 103, the first current limiting module 102, and the voltage detection module 105, etc. The first current limiting module 102 controls the current to avoid excessive current in the circuit to protect the circuit from damage. The first end of the first current limiting module 102 is connected to the first power supply 101, which limits the current passing through the circuit to protect the subsequent circuit (such as the microphone 10 circuit) from damage caused by excessive current. The voltage stabilizing module 103 provides a stable voltage for the microphone 10. The function of the voltage stabilizing module 103 is to adjust the voltage to keep the microphone 10 always at a stable working voltage, thereby ensuring the stable performance of the microphone 10. The mechanical button 104 controls the voice signal output of the microphone 10. Pressing the button starts the signal output of the microphone 10, and when the button is released, a mechanical rebound "bang" sound will be produced. The negative pole of the microphone and the ground are disconnected at the same time, and there is no need for the control module to detect to turn off the audio path of the microphone to prevent the "bang" sound of the mechanical rebound of the plastic shell from being transmitted to the audio path. The voltage detection module 105 detects the state of the mechanical button 104 (whether it is on or off) and outputs different voltage signals. When the mechanical button 104 is on (pressed), the voltage detection module 105 outputs a first voltage; when the button is off (released), it outputs a second voltage. These two voltage signals indicate whether the microphone 10 should continue to work. The control module 106 controls the voice signal output of the microphone 10 according to the voltage signal of the voltage detection module 105. The voice signal output end of the control module 106 is connected to the first end of the microphone 10, which is responsible for providing voice signals to the microphone 10. When the voltage detection module 105 detects the first voltage (i.e. the mechanical button 104 is on), the control module 106 outputs voice signals to the microphone 10, allowing the microphone 10 to emit voice; when the voltage detection module 105 detects the second voltage (i.e. the mechanical button 104 is released), the control module 106 stops outputting voice signals to the microphone 10, cutting off the signal output of the microphone 10. The working process is as follows: the user presses the mechanical button 104, the voltage detection module 105 outputs the first voltage, and the control module 106 detects the signal and provides voice signals to the microphone 10, and the microphone 10 starts to work and transmit voice signals. The user releases the mechanical button 104, the voltage detection module 105 outputs the second voltage, and the control module 106 detects the signal and stops outputting voice signals to the microphone 10, and the microphone 10 stops working. Through this design, the mechanical rebound noise of the microphone 10 when the button is released can be effectively avoided, thereby ensuring the clarity and quality of voice communication.

[0038] The technical effect of the technical solution provided by the embodiment one is that: by integrating the voltage detection module and the control module, the accurate control of the microphone voice signal is realized, when the mechanical key is turned on, the circuit can quickly detect and enable the voice signal output; when the mechanical key is released, the microphone is powered off, thereby effectively eliminating the noise interference caused by mechanical rebound when the key is released, not only improving the communication sound quality and ensuring the clear listening of the receiving party, but also significantly enhancing the reliability and user experience of ship communication, meeting the demand of high-quality communication of ships in complex sea environment.

[0039] As an implementation manner, as shown in Figure 2 The first current limiting module 102 includes a first resistor R1, a third resistor R3 and a first capacitor C1, the first end of the first resistor R1 is the first end of the first current limiting module 102, the second end of the first resistor R1 is connected with the first end of the first capacitor C1 and the first end of the third resistor R3 respectively, and the second end of the first capacitor C1 and the second end of the third resistor R3 are the second end of the first current limiting module 102.

[0040] The voltage stabilizing module 103 includes a third capacitor C3, the first end of the third capacitor C3 is the first end of the voltage stabilizing module 103, and the second end of the third capacitor C3 is the second end of the voltage stabilizing module 103.

[0041] The voltage detection module 105 includes a second resistor R2 and a fourth resistor R4, the first end of the second resistor R2 is the first end of the voltage detection module 105, the second end of the second resistor R2 and the first end of the fourth resistor R4 are commonly connected as the third end of the voltage detection module 105, and the second end of the fourth resistor R4 is the second end of the voltage detection module 105.

[0042] The marine microphone control circuit further includes a second capacitor C2, the first end of the second capacitor C2 is connected with the first end of the microphone 10, and the second end of the second capacitor C2 is connected with the output end of the control module 106.

[0043] When the mechanical key S1 is pressed, the voltage on the fourth resistor R4 becomes low, and when the MCU detects the low voltage, the transmission program is started. When the transmission is finished and the mechanical key S1 is released, the voltage on the fourth resistor R4 becomes high, and when the MCU detects the high voltage, the closing transmission program is started. At the same time of releasing the key S1, the negative electrode of the microphone B1 and the ground are also synchronously disconnected, there is no current, and the work is stopped. The mechanical sound transmitted into the audio path is basically solved in real time, and the control circuit structure of the prior art for controlling the on-off of the microphone through the field effect tube is simplified, and the cost is saved.

[0044] Further, as shown in Figure 3As shown, in order to reduce the influence of the harsh environment on the audio signal, the marine microphone control circuit further comprises a temperature and humidity sensor module 201, a temperature and humidity signal processing module 202, a gain module 203, a voltage-stabilized temperature compensation module 204, and a filter dynamic adjustment module 205; the temperature and humidity sensor module 201 is connected to the temperature and humidity signal processing module 202, the temperature and humidity signal processing module 202 is connected to the control module 106, the control module 106 is connected to the gain module 203, the gain module 203 is connected to the voltage-stabilized temperature compensation module 204, and the voltage-stabilized temperature compensation module 204 is connected to the filter dynamic adjustment module 205.

[0045] The temperature and humidity sensor module 201 can be DHT22 (digital signal output, suitable for ship environment) or SHT31 (supports digital I2C signal), which is used to collect environmental temperature and humidity data. The temperature and humidity signal processing module 202 uses an analog-to-digital conversion module (ADC) such as ADS1115 to convert the output signal of the sensor into a digital signal, and inputs the digital signal into the control module 106 (such as STM32 or Arduino) for real-time analysis. The control module 106 generates a control signal according to the set temperature and humidity compensation algorithm. The gain module 203 uses a digital adjustable gain amplifier such as OPA861 or MAX9724, which is placed in the microphone signal channel. The control module 106 generates a control signal according to the temperature and humidity data, adjusts the gain of the amplifier through the I2C or SPI interface, and compensates for the signal attenuation caused by changes in temperature and humidity. The voltage-stabilized temperature compensation module 204 uses a temperature-compensated voltage regulator such as LM317 or other linear voltage regulators with temperature compensation function. A thermistor (NTC or PTC) is added to the power supply circuit to detect the circuit temperature in real time. The temperature signal adjusts the output of the voltage regulator through the control module 106 to ensure the stability of the power supply voltage of the microphone. The filter dynamic adjustment module 205 uses an active filter (such as a Sallen-Key structure filter), and the control module 106 adjusts the cutoff frequency of the filter according to the temperature and humidity signal to optimize the microphone signal processing.

[0046] The temperature and humidity data is collected by a sensor such as DHT22, and the temperature and humidity signal is transmitted to the micro-control module 106 through the ADC module. The control module 106 generates gain adjustment, filter adjustment, and voltage compensation signals according to the preset compensation algorithm. The gain module 203 and the voltage-stabilized temperature compensation module 204 adjust the gain parameter of the gain amplifier according to the real-time temperature and humidity data to optimize the signal strength and dynamically change the frequency response of the filter to eliminate low-frequency or high-frequency noise caused by environmental influences. The voltage-stabilized temperature compensation module 204 detects the circuit temperature and stabilizes the power supply voltage of the microphone by adjusting the voltage regulator or thermistor circuit.

[0047] Through the above-mentioned compensation circuit design, the change of temperature and humidity in the ship environment can be effectively coped with, and the intelligibility and stability of the microphone voice signal are improved.

[0048] Embodiment two

[0049] The embodiment two provides a marine electronic equipment, which comprises the marine microphone control circuit and the microphone described in the embodiment one.

[0050] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A marine microphone control circuit, characterized in that, include: First power source; The first current limiting module has its first terminal connected to the first power supply; A voltage regulator module, the first end of which is connected to the second end of the first current limiting module and the first end of the microphone, and the second end of which is connected to the second end of the microphone, is used to regulate the voltage of the microphone; A mechanical button, the first end of which is connected to the second end of the microphone and the second end is grounded, is used to power on the microphone when it is on and to power off the microphone when it is off. A voltage detection module, with its first end connected to the first power supply and its second end connected to the second end of the microphone, is used to output a first voltage from the third end when the mechanical button is turned on, and to output a second voltage from the third end when the mechanical button is turned off; The control module has its voice signal output terminal connected to the first terminal of the microphone and its signal detection terminal connected to the third terminal of the voltage detection module. It is used to output a voice signal to the microphone when the mechanical button is activated by the first voltage and to stop outputting a voice signal to the microphone when the mechanical button is deactivated by the second voltage.

2. The marine microphone control circuit as described in claim 1, characterized in that, The first current limiting module includes a first resistor, a third resistor, and a first capacitor. The first end of the first resistor is the first end of the first current limiting module. The second end of the first resistor is connected to the first end of the first capacitor and the first end of the third resistor. The second end of the first capacitor and the second end of the third resistor are the second ends of the first current limiting module.

3. The marine microphone control circuit as described in claim 2, characterized in that, The voltage regulator module includes a third capacitor, the first terminal of which is the first terminal of the voltage regulator module, and the second terminal of which is the second terminal of the voltage regulator module.

4. The marine microphone control circuit as described in claim 1, characterized in that, The voltage detection module includes a second resistor and a fourth resistor. The first end of the second resistor is the first end of the voltage detection module. The second end of the second resistor and the first end of the fourth resistor are connected together to form the third end of the voltage detection module. The second end of the fourth resistor is the second end of the voltage detection module.

5. The marine microphone control circuit as described in claim 1, characterized in that, The marine microphone control circuit also includes a second capacitor, the first end of which is connected to the first end of the microphone, and the second end of which is connected to the output of the control module.

6. The marine microphone control circuit as described in claim 1, characterized in that, The marine microphone control circuit also includes a temperature and humidity sensor module, a temperature and humidity signal processing module, a gain module, a voltage regulation temperature compensation module, and a filter dynamic adjustment module. The temperature and humidity sensor module is connected to the temperature and humidity signal processing module, the temperature and humidity signal processing module is connected to the control module, the control module is connected to the gain module, the gain module is connected to the voltage regulation temperature compensation module, and the voltage regulation temperature compensation module is connected to the filter dynamic adjustment module.

7. A marine electronic device, characterized in that, Includes the marine microphone control circuit and microphone as described in any one of claims 1 to 6.

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