CN2694428Y - Noise protection for earmuffs - Google Patents

Abstract

The utility model relates to a noise protector for earmuff indicates one kind by audio frequency receiving unit 1, audio amplification unit 2, volume control amplification unit 3, current amplification unit 4, gain control signal unit 5, impedance matching unit 6, gain control unit 7, gain adjustment unit 8, volume adjustment unit 9, audio amplification unit 10, the constructional element such as audio output unit 11 constitutes, can make the person of wearing when being in the environment of high noise, the noise that will get into in the earmuff more than certain decibel number attenuates to the protection earmuff can not receive the injury.

Description

Noise protection for earmuffs

technical field

The utility model relates to a noise protection device for earmuffs, which refers to an audio receiving unit, an audio amplifying unit, a volume control amplifying unit, a current amplifying unit, a gain control signal unit, an impedance matching unit, a gain control unit, a gain The adjustment unit, the volume adjustment unit, the audio amplification unit, the audio output unit and other structural components can make the wearer in a high-noise environment, and the noise of the audio signal entering the earmuffs is above a certain decibel. Attenuation to protect the eardrum from damage.

Background technique

Generally speaking, although there are many types of noise protection devices for earmuffs that are used to protect the eardrum from damage, the technical means adopted in the structural design are limited to blocking noise above a certain decibel level. , when the user wearing earmuffs is in the audio environment above the certain decibel number, he will not be able to hear any external sound above the decibel number at all, and the design of the utility model can achieve the The audio signal in the cover will automatically attenuate the noise above a certain number of decibels, and will not completely block the audio, so that the user wearing the earmuffs can protect the eardrum from harm in this environment. In addition, all the external sounds can still be heard, so it is more practical and progressive compared to the common configuration.

Utility model content

The main purpose of this utility model is to provide a noise protection device for earmuffs, which can automatically attenuate the noise of the audio signal entering the earmuffs above a certain decibel number by using the composition relationship of the various structural components on it, and The audio will not be completely blocked, so that the user wearing the earmuffs can still hear all the external sounds in this environment, except that the eardrum can be safely protected from damage.

Noise protection device for earmuffs, characterized in that:

The devices include:

Audio receiving unit 1: it can be a condenser microphone to receive external audio signals;

Audio amplifying unit 2: used to amplify the external audio signal received by the audio receiving unit 1;

Volume control amplifying unit 3: used to re-amplify the audio signal amplified by the audio amplifying unit 2;

Current amplifying unit 4: used to control the audio signal received by the volume control amplifying unit 3, after being processed by the current amplifying unit 4, the converted output audio signal is 85dB (an audio signal equal to a voltage of 0.6V);

Gain control signal unit 5: used to convert the converted 0.6V voltage audio signal output after being processed by the current amplification unit 4, after the processing, the converted output audio signal is a control signal of 0V voltage;

Impedance matching unit 6: used to match the audio signal amplified by the audio amplifier unit 2, and impedance the audio signal amplified by the audio amplifier unit to reduce audio signal loss;

Gain control unit 7: It is a field effect transistor, which is used to convert the output audio signal converted by the receiving gain control signal unit 5 into a control signal of 0V voltage, the gain control unit 7 is turned on, so that the impedance matching unit 6 The amplified audio signal passes through the volume adjustment unit 9 after being attenuated by the gain adjustment unit 8;

Volume adjustment unit 8: a variable resistor used to adjust the signal size of the audio signal passing through the above-mentioned impedance matching unit to control the output volume;

Audio amplification unit 10: used to amplify the audio signal adjusted by the volume adjustment unit 9;

Audio output unit 11: a loudspeaker. After the audio signal is processed by the audio amplification unit 2, the audio signal connected to the audio receiving unit 1 can be heard on the loudspeaker of the audio output unit 11.

The structure of the noise protection device for earmuffs has the beneficial effects of:

The utility model is composed of an audio receiving unit, an audio amplifying unit, a volume control amplifying unit, a current amplifying unit, a gain control signal unit, an impedance matching unit, a gain control unit, a gain adjusting unit, a volume adjusting unit, an audio amplifying unit, an audio output unit, etc. Composed of structural components, when the wearer is in a high-noise environment, the noise of the audio signal entering the earmuffs above a certain number of decibels can be attenuated to protect the eardrum from damage.

Description of drawings

Fig. 1 is a schematic diagram of the audio receiving circuit of the present utility model;

Fig. 2 is a comparative schematic diagram of the waveforms produced by the various circuits of the present invention.

Description of figure number:

Audio receiving unit 1 Audio amplifying unit 2

Volume Control Amplifying Unit 3 Current Amplifying Unit 4

Gain control signal unit 5 Impedance matching unit 6

Gain Control Unit 7 Gain Adjustment Unit 8

Volume Adjustment Unit 9 Audio Amplification Unit 10

Audio output unit 11

Detailed ways

Please refer to Figs. 1 and 2, wherein Fig. 1 is a schematic diagram of the audio receiving circuit of the present invention and Fig. 2 is a schematic diagram of the comparison of waveforms produced by the various circuits of the present invention. From these two figures, it can be seen that the relationship between each component and each component of the present utility model and its function are composed of audio receiving unit 1, audio amplifier unit 2, volume control amplifier unit 3, current amplifier unit 4, gain control signal Unit 5, impedance matching unit 6, gain control unit 7, gain adjustment unit 8, volume adjustment unit 9, audio amplification unit 10, audio output unit 11 and other structural elements are combined, wherein the audio receiving unit 1 can be a condenser microphone , its function is to receive the audio signal from the outside world, when the audio signal from the outside world is received by the audio receiving unit 1, the audio signal will be transmitted to the audio amplifier unit 2 through the circuit, and the audio amplifier unit 2 will transmit the audio signal The external audio signal received by the audio receiving unit 1 is amplified; after the external audio signal is amplified, it is transmitted to the volume control amplifying unit 3 through the circuit, and the volume control amplifying unit 3 then amplifies the output of the audio amplifying unit 2. The amplified audio signal is amplified again, and the audio signal amplified by the volume control amplifying unit 3 can be transmitted to the current amplifying unit 4 through the circuit, and then the current amplifying unit 4 processes the audio signal received by the volume control amplifying unit 3, After being processed by the current amplifying unit 4, the output audio signal is 85dB (equal to the audio signal of 0.6V voltage), and the converted 0.6V voltage audio signal output after being processed by the current amplifying unit 4 can be passed to the gain control through the circuit At the signal unit 5, after receiving and processing through the gain control signal unit 5, the converted audio signal output is a control signal of 0V voltage, and if the received audio source is an audio signal less than 85dB, the converted output audio signal The signal is a control signal of 3V voltage; the impedance matching unit 6 can transmit and receive the audio signal amplified by the audio amplifier unit 2 to be matched by the circuit, and the audio signal amplified by the audio amplifier unit 2 is impedanced to reduce the loss of the audio signal; the gain control unit 7. It is a field-effect transistor. When the audio signal converted by the above-mentioned gain control signal unit 5 is converted to a control signal of 0V voltage, the gain control unit 7 is turned on, so that the audio signal amplified by the impedance matching unit 6 After being attenuated by the gain adjustment unit 8, the volume adjustment unit 9 passes through the volume adjustment unit 9. When the audio signal converted by the above-mentioned gain control signal unit 5 is a control signal of 3V voltage, the gain control unit 7 is not turned on, so that the impedance matching unit 6. The amplified audio signal can directly pass through the volume adjustment unit 9; the gain adjustment unit 8 is a fixed resistor used to adjust the gain value after the attenuation of the gain adjustment unit 8; the volume adjustment unit 9 is a variable resistor used to adjust the above-mentioned The signal size of the audio signal of the impedance matching unit 6 is to control the size of the output volume; the audio amplifier unit 10 is used to amplify the audio signal adjusted by the above-mentioned volume adjustment unit 9; the audio output unit 11 is used to amplify the audio signal in the audio for the speaker After processing by the unit 10, the audio signal connected to the audio receiving unit 1 can be heard on the speaker of the audio output unit 11. The device composed of the above-mentioned structural components can attenuate the output of the noise volume so as to protect the eardrum from damage.

Claims (3)

1. A noise protection device for earmuffs, characterized in that: The devices include: Audio receiving unit (1): it can be a condenser microphone to receive external audio signals; Audio amplification unit (2): used to amplify the external audio signal received by the audio receiving unit (1); Volume control amplifying unit (3): used to amplify the audio signal amplified by the audio amplifying unit (2); Current amplifying unit (4): used to control the audio signal received by the volume control amplifying unit (3), after being processed by the current amplifying unit (4), the converted output audio signal is 85dB (equal to an audio signal with a voltage of 0.6V); Gain control signal unit (5): used to process the converted 0.6V voltage audio signal output by the current amplification unit (4), and after its processing, the converted output audio signal is a control signal of 0V voltage; Impedance matching unit (6): used to match the audio signal amplified by the audio amplifier unit (2), and impedance the audio signal amplified by the audio amplifier unit to reduce audio signal loss; Gain control unit (7): It is a field effect transistor, which is used to convert the output audio signal converted by the received gain control signal unit (5) into a control signal of 0V voltage, the gain control unit (7) is turned on, Let the audio signal amplified by the impedance matching unit (6) pass through the volume adjustment unit (9) after being attenuated by the gain adjustment unit (8); Volume adjustment unit (8): a variable resistor used to adjust the signal size of the audio signal passing through the above-mentioned impedance matching unit to control the output volume; Audio amplification unit (10): used to amplify the audio signal adjusted by the volume adjustment unit (9); Audio output unit (11): it is a loudspeaker. After the audio signal is processed by the audio amplification unit (2), the audio signal connected to the audio receiving unit (1) can be heard on the loudspeaker of the audio output unit (11). 2. The noise protection device for earmuffs as claimed in claim 1, characterized in that: the gain control signal unit (5), if the received sound source is an audio signal less than 85dB, the converted audio output The signal is a control signal of 3V voltage. 3. The noise protection device for earmuffs according to claim 1, characterized in that: the gain control unit (7), after receiving the converted audio signal from the gain control signal unit (5), the output audio signal is a control signal of 3V voltage , the gain control unit (7) is not turned on, so that the audio signal amplified by the impedance matching unit (6) can directly pass through the volume adjustment unit (9).

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