CN113327569A - Noise reduction method, system and device for pure-tone audiometer - Google Patents
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Abstract
The invention discloses a noise reduction method, a system and a device for a pure-tone audiometer, wherein the related noise reduction system comprises a microphone acquisition module, a processing module and a loudspeaker; the processing module is respectively connected with the loudspeaker and the microphone acquisition module; the microphone acquisition module is used for acquiring the environmental noise at the ear of a person and sending the acquired environmental noise to the processing module; the processing module is used for receiving the environmental noise sent by the microphone acquisition module, amplifying the received environmental noise through the first amplifying circuit, converting the amplified environmental noise into digital audio through the A/D module and then entering the DSP module for processing, performing algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through the inverter circuit; and the loudspeaker is used for playing the sound corresponding to the analog audio output by the processing module.
Description
Technical Field
The invention relates to the technical field of voice noise reduction, in particular to a noise reduction method, a noise reduction system and a noise reduction device for a pure-tone audiometer.
Background
The pure-tone audiometer is a medical electro-acoustic instrument with a hearing test function designed according to the electro-acoustic principle and is used in the aspects of clinic, scientific research and the like. The device mainly comprises a power supply, a host, a transponder, a loudspeaker and the like. Can generate pure tones with various frequencies, and transmit the pure tones into the ears of a subject through a loudspeaker. The subject himself judges whether or not the sound emitted from the speaker is heard, and gives a response signal with the minimum sound intensity audible at each frequency as the hearing threshold. The method is used for testing the auditory acuity of different frequencies in an auditory range, judging whether auditory disorder exists or not, estimating the degree of auditory loss and making preliminary judgment on the type and pathological change parts of deafness.
The loudspeaker is an important component of an audiometer audiometric system as an electroacoustic transducer. The tested person can make a corresponding response signal by subjectively sensing whether the sound in the loudspeaker exists or not. Thus, ambient noise has a large effect on the results of the test, and excessive ambient noise can mask the test pure tone inside the speaker. Existing pure tone audiometers must be used in dedicated audiometric rooms. The construction of audiometric rooms is a complex system project, which is time consuming, expensive and space consuming.
Because the existing audiometer is required to be used in a special audiometer room, on one hand, the application range of the audiometer is limited, on the other hand, the recommendation of the audiometer room needs to consume more manpower and material resources, the construction cost of the audiometer room is usually higher than the cost of audiometer equipment, and the popularization and the use of the audiometer are not facilitated. Accordingly, the present invention provides a noise reduction method, system and apparatus for a pure tone audiometer to solve the above problems.
Disclosure of Invention
The invention aims to provide a noise reduction method, a system and a device for a pure-tone audiometer, aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a noise reduction system for a pure-tone audiometer comprises a microphone acquisition module, a processing module and a loudspeaker; the processing module is respectively connected with the loudspeaker and the microphone acquisition module; the processing module comprises a first amplifying circuit, an A/D module, a DSP module, a first D/A module and an inverter circuit; the first amplifying circuit, the A/D module, the DSP module, the first D/A module and the inverter circuit are connected in sequence;
the microphone acquisition module is used for acquiring the environmental noise at the ear of a person and sending the acquired environmental noise to the processing module;
the processing module is used for receiving the environmental noise sent by the microphone acquisition module, amplifying the received environmental noise through the first amplifying circuit, converting the amplified environmental noise into digital audio through the A/D module and then entering the DSP module for processing, performing algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through the inverter circuit;
and the loudspeaker is used for playing the sound corresponding to the analog audio output by the processing module.
Further, the DSP module is also used for outputting audio signals of the audiometer.
The digital signal processor further comprises a second D/A module and a second amplifying circuit, wherein the second D/A module is respectively connected with the DSP module and the second amplifying circuit; the DSP module outputs the audio signal of the audiometer to the second D/A module for digital-to-analog conversion to obtain an analog audio signal, inputs the obtained analog audio signal to the second amplifying circuit for amplification processing, and outputs the amplified analog audio signal.
The audio mixing circuit is respectively connected with the phase inverting circuit, the second amplifying circuit and the loudspeaker, and is used for receiving the analog audio output by the phase inverting circuit and the analog audio signal output by the second amplifying circuit, superposing the analog audio output by the phase inverting circuit and the analog audio signal output by the second amplifying circuit and outputting the superposed signals to the loudspeaker.
Further, the processing of the converted digital audio by the DSP module in the processing module specifically includes: and performing band-stop filtering and low-pass filtering processing on the digital audio.
The microphone sound collecting device further comprises an amplitude detecting module connected with the microphone collecting module, wherein the amplitude detecting module is used for receiving the volume collected by the microphone collecting module and judging whether the collected volume exceeds a preset value, and if so, a warning signal is sent to an operator.
Further, the bandwidth of the band-stop filtering process for the digital audio is 1/3 OCT.
Further, the cut-off frequency when the low-pass filtering processing is performed on the digital audio is 9 kHz.
Correspondingly, a noise reduction method for the pure-tone audiometer is also provided, and comprises the following steps:
s1, collecting environmental noise at human ears;
s2, amplifying the received environmental noise through a first amplifying circuit, converting the amplified environmental noise into digital audio through an A/D module, then entering a DSP module for processing, carrying out algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through an inverter circuit;
and S3, playing the sound corresponding to the output analog audio.
Correspondingly, the noise reduction device for the pure-tone audiometer comprises an earphone and a noise reduction system; the microphone collection module is arranged on the earphone.
Compared with the prior art, the invention provides a noise reduction method, a system and a device for a pure-tone audiometer, which can reduce the environmental noise in an earphone of the audiometer, so that the audiometer can be normally used in a common indoor environment and get rid of the limitation of audiometry places.
Drawings
FIG. 1 is a circuit diagram of a noise reduction system for a pure tone audiometer according to an embodiment;
FIG. 2 is a schematic diagram illustrating an embodiment of a DSP module for performing algorithm processing on a converted digital audio;
FIG. 3 is a schematic view of a detection module provided in the second embodiment;
FIG. 4 is a schematic diagram of an audio chip employing a CODEC according to a third embodiment;
fig. 5 is a schematic diagram of a noise reduction device for a pure-tone audiometer according to a fifth embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide a noise reduction method, a system and a device for a pure-tone audiometer, aiming at the defects of the prior art.
Example one
The embodiment provides a noise reduction system for a pure-tone audiometer, as shown in fig. 1, including a microphone acquisition module, a processing module, a speaker, a key and a display; the processing module is respectively connected with the loudspeaker, the microphone acquisition module and the keys, wherein the loudspeaker is an earphone.
The processing module comprises a first amplifying circuit, an A/D module, a DSP module, a first D/A module and an inverter circuit; the first amplifying circuit, the A/D module, the DSP module, the first D/A module and the inverter circuit are connected in sequence; the DSP module is also connected with the keys and the display.
As shown in fig. 1, the digital signal processor further comprises a second D/a module and a second amplifying circuit, wherein the second D/a module is respectively connected with the DSP module and the second amplifying circuit.
At present, the earphone used with the audiometer is a headphone, in this embodiment, a microphone collection module is installed on the existing earphone, and the noise reduction processing module is integrated on the earphone, which is an integrated structure. However, the audiometer can only use the earphone with a fixed model, and is not convenient to be made into an integrated structure, so that the processing module needs to be placed on a main board of the audiometer, and only one acquisition module is installed on the earphone.
The audio signal output path of the audiometer is specifically as follows: the audio signal is output to the second D/A module through the DSP module to be subjected to digital-to-analog conversion processing, so that an analog audio signal is obtained, the obtained analog audio signal is input to the second amplifying circuit to be subjected to amplification processing, and the amplified analog audio signal is output to the earphone. The sound generated by the second D/A module is a sine wave pure sound from 125Hz to 8kHz, and is a test sound of the audiometer.
When audiometer's audio signal output, the noise reduction processing module can handle the ambient noise of people's ear department, specifically is:
the microphone acquisition module is used for acquiring the environmental noise at the ear of a person and sending the acquired environmental noise to the processing module;
the processing module is used for receiving the environmental noise sent by the microphone acquisition module, amplifying the received environmental noise through the first amplifying circuit, converting the amplified environmental noise into digital audio through the A/D module and then entering the DSP module for processing, performing algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through the inverter circuit.
The amplification factors of the first amplification circuit and the second amplification circuit can be adjusted according to actual conditions, are specifically controlled by an IO port of the DSP, and are used for realizing the optimal noise reduction effect when the audiometer is calibrated.
Fig. 2 is a schematic diagram illustrating the DSP module performing algorithm processing on the converted digital audio. In this embodiment, in order to avoid attenuation of the test tone during noise reduction, the digital audio signal acquired by the microphone acquisition module needs to be subjected to band-stop filtering processing by a band-stop filter; the specific filtering method comprises the following steps: a digital trap is designed, the center frequency of the trap is the frequency of the test tone, and the bandwidth of the trap is 1/3OCT (octave). When the frequency of the test tone is adjusted by the user, the center frequency of the trap should be changed accordingly. In this embodiment, in order to further eliminate the inherent high-frequency noise of the microphone and the circuit, the digital audio signal needs to be low-pass filtered by a low-pass filter, and the cut-off frequency of the low-pass filtering is 9 kHz.
The embodiment further comprises a sound mixing circuit, which is respectively connected with the phase inverting circuit, the second amplifying circuit and the loudspeaker, and is used for receiving the analog audio output by the phase inverting circuit and the analog audio signal output by the second amplifying circuit, and outputting the analog audio output by the phase inverting circuit and the analog audio signal output by the second amplifying circuit to the loudspeaker after being superposed.
And the loudspeaker is used for playing the superposed sound output by the sound mixing circuit.
The keys are used to operate the audiometer.
Compared with the prior art, the noise reduction system for the pure-tone audiometer can reduce the environmental noise in the earphone of the audiometer, so that the audiometer can be normally used in a common indoor environment, and the limitation of an audiometric place is eliminated.
Example two
The difference between the noise reduction system for the pure-tone audiometer provided by the present embodiment and the first embodiment is that:
as shown in fig. 3, the present embodiment further includes an amplitude detection module connected to the microphone collection module, where the amplitude detection module continuously detects the volume collected by the microphone collection module, and determines whether the collected volume exceeds a preset value X, and if so, indicates that the environmental noise at this time exceeds an upper limit of the noise reduction of the device, sends a warning signal to a display used by an operator, so as to remind the operator.
The embodiment can continuously monitor whether the environmental noise exceeds the preset value, so that an operator can timely know the current test environment.
EXAMPLE III
The difference between the noise reduction system for the pure-tone audiometer provided by the present embodiment and the first embodiment is that:
as shown in fig. 4, in this embodiment, a CODEC audio chip is used to replace the first amplifier circuit, the a/D module, the first D/a module, the inverter circuit, the second D/a module, and the second amplifier circuit in the first embodiment.
In the embodiment, the modules are all replaced by CODEC audio chips, so that the installation and the use are more convenient.
Example four
The embodiment provides a noise reduction method for a pure-tone audiometer, which comprises the following steps:
s1, collecting environmental noise at human ears;
s2, amplifying the received environmental noise through a first amplifying circuit, converting the amplified environmental noise into digital audio through an A/D module, then entering a DSP module for processing, carrying out algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through an inverter circuit;
and S3, playing the sound corresponding to the output analog audio.
It should be noted that, the noise reduction method for the pure-tone audiometer provided in this embodiment is similar to that in the first, second, and third embodiments, and will not be described herein again.
Compared with the prior art, the noise reduction method for the pure-tone audiometer can reduce the environmental noise in the earphone of the audiometer, so that the audiometer can be normally used in a common indoor environment, and the limitation of an audiometer place is eliminated.
EXAMPLE five
The present embodiment provides a noise reduction apparatus for a pure tone audiometer, as shown in fig. 5, including a headphone and a noise reduction system.
The composition structure of the headset is similar to that of the prior art, and in this embodiment, only one microphone acquisition module is installed at circle 1 in fig. 5, and the microphone has directivity, and the pointing direction is the outer side of the headset, so as to reduce the acquisition of the sound emitted by the headset itself; and the rest noise reduction processing modules and the amplitude detection module are integrated on a mainboard of the audiometer.
It should be noted that the noise reduction processing module and the amplitude detection module are similar to those in the first and second embodiments, and are not described in detail again.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A noise reduction system for a pure-tone audiometer is characterized by comprising a microphone acquisition module, a processing module and a loudspeaker; the processing module is respectively connected with the loudspeaker and the microphone acquisition module; the processing module comprises a first amplifying circuit, an A/D module, a DSP module, a first D/A module and an inverter circuit; the first amplifying circuit, the A/D module, the DSP module, the first D/A module and the inverter circuit are connected in sequence;
the microphone acquisition module is used for acquiring the environmental noise at the ear of a person and sending the acquired environmental noise to the processing module;
the processing module is used for receiving the environmental noise sent by the microphone acquisition module, amplifying the received environmental noise through the first amplifying circuit, converting the amplified environmental noise into digital audio through the A/D module and then entering the DSP module for processing, performing algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through the inverter circuit;
and the loudspeaker is used for playing the sound corresponding to the analog audio output by the processing module.
2. The noise reduction system for a pure tone audiometer according to claim 1, wherein the DSP module is further configured to output an audio signal of the audiometer.
3. The noise reduction system for the pure-tone audiometer according to claim 2, further comprising a second D/a module and a second amplifying circuit, wherein the second D/a module is connected to the DSP module and the second amplifying circuit, respectively; the DSP module outputs the audio signal of the audiometer to the second D/A module for digital-to-analog conversion to obtain an analog audio signal, inputs the obtained analog audio signal to the second amplifying circuit for amplification processing, and outputs the amplified analog audio signal.
4. The noise reduction system for the pure-tone audiometer according to claim 3, further comprising a mixing circuit, connected to the inverter circuit, the second amplifier circuit, and the speaker, respectively, for receiving the analog audio output by the inverter circuit and the analog audio signal output by the second amplifier circuit, and outputting the superimposed analog audio output by the inverter circuit and the superimposed analog audio signal output by the second amplifier circuit to the speaker.
5. The noise reduction system for the pure-tone audiometer according to claim 1, wherein the processing module in the DSP module performs an arithmetic process on the converted digital audio specifically: and performing band-stop filtering and low-pass filtering processing on the digital audio.
6. The noise reduction system for the pure-tone audiometer according to claim 1, further comprising an amplitude detection module connected to the microphone collection module, wherein the amplitude detection module is configured to receive the volume collected by the microphone collection module, determine whether the collected volume exceeds a preset value, and send a warning signal to an operator if the collected volume exceeds the preset value.
7. The noise reduction system for a pure tone audiometer according to claim 5, wherein the band-stop filtering of the digital audio has a bandwidth of 1/3 OCT.
8. The noise reduction system for a pure tone audiometer according to claim 5, wherein the low pass filtering of the digital audio has a cut-off frequency of 9 kHz.
9. A method of noise reduction for a noise reduction system for a pure-tone audiometer according to any one of claims 1 to 8, comprising:
s1, collecting environmental noise at human ears;
s2, amplifying the received environmental noise through a first amplifying circuit, converting the amplified environmental noise into digital audio through an A/D module, then entering a DSP module for processing, carrying out algorithm processing on the converted digital audio through the DSP module, converting the digital audio after the algorithm processing into analog audio through the first D/A module, and outputting the converted analog audio through an inverter circuit;
and S3, playing the sound corresponding to the output analog audio.
10. A noise reduction device for a pure tone audiometer, comprising headphones and a noise reduction system for a pure tone audiometer according to any one of claims 1 to 8; the microphone collection module is arranged on the earphone.
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