CN217306099U - Sound level meter capable of eliminating steady-state interference sound - Google Patents
Sound level meter capable of eliminating steady-state interference sound Download PDFInfo
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- CN217306099U CN217306099U CN202123147227.3U CN202123147227U CN217306099U CN 217306099 U CN217306099 U CN 217306099U CN 202123147227 U CN202123147227 U CN 202123147227U CN 217306099 U CN217306099 U CN 217306099U
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Abstract
The utility model relates to a sound level meter capable of eliminating steady-state interference sound, which comprises a shell, wherein a microphone, a preamplifier, an A/D converter, a memory, a sound separation module, an attenuator, an amplifier, a frequency weighting device, a wave detector, a sound channel and a storage battery are arranged in the shell; the shell is provided with a display screen and a control button, the shell is also provided with a controller, and a microphone, a preamplifier, an A/D converter, a memory, a sound separation module, a sound channel, a sound synthesis module, an attenuator, an amplifier, a frequency weighting device and a wave detector are respectively in control connection with the controller; the display screen and the control button are respectively electrically connected with the controller; a charging port for charging the storage battery is arranged on the shell; the mixed sound signal is separated into sound units, and meanwhile, the steady interference noise can be separated from the mixed sound signal obtained by the sound level meter, so that the interference of the interference noise on sound environment monitoring is avoided.
Description
Technical Field
The utility model belongs to the technical field of the noise is measured, especially, relate to can reject sound level meter of steady state interference sound.
Background
The sound level meter is the most basic noise measuring instrument, which is an electronic instrument, but is different from objective electronic instruments such as a voltmeter and the like. When the sound signal is converted into the electric signal, the time characteristic of the response speed of the human ear to the sound wave can be simulated; there are characteristics of different sensitivity and intensity characteristics that change characteristics at different loudness. A sound level meter is a subjective electronic instrument.
In the prior art, a sound level meter generally comprises a microphone, a preamplifier, an attenuator, an amplifier, a frequency weighting network, a wave detector, a display screen, a memory, a microcontroller, a power supply and the like. The basic working principle is as follows: the microphone transmits the sound information to the converter, the converter converts the sound signal into an electric signal, and the preamplifier converts the impedance to match the microphone with the attenuator. The amplifier adds the output signal into the frequency weighting network, carries on frequency weighting to the signal, then amplifies the signal to certain amplitude through the attenuator and the amplifier, sends to the effective value detector, gives the value of the noise level on the indicator.
When highway environment monitoring is carried out, the situation that steady-state interference factors such as pedestrian speaking, bird calling and cicada ringing exist around a monitoring point location to cause monitoring data distortion, especially cicada ringing, lasts for several months from 6 months to 10 months every year, and the highway is tall in forest density along the highway, and the cicada ringing generates petty volts in daytime and continuously rings almost without interruption is often met. The existing sound level meter can remove the burst noise during detection, but can not remove the steady interference noise. Therefore, when the interference factors exist, the monitoring data acquired by the existing sound level meter has obvious distortion and cannot be used as an effective monitoring result, and the accuracy of the monitoring data and the monitoring working progress are seriously influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a can reject the sound level meter of steady state interference sound to the sound level meter among the solution prior art can not reject the condition that steady state interference noise leads to the detected data of gathering to have the distortion.
In order to achieve the above object, the utility model discloses a technical scheme that can reject sound level meter of steady state interference sound adopted is:
a sound level meter that rejects steady state interfering sounds, comprising:
a housing;
the casing is provided with a microphone, a preamplifier, an A/D converter, a memory, a sound separation module, a wave detector, a sound channel, a sound synthesis module, an attenuator, an amplifier and a frequency weight device;
the microphone is used for collecting sound;
the preamplifier is used for amplifying the sound collected by the microphone;
the A/D converter is used for converting the sound signal amplified by the preamplifier into a digital signal;
a plurality of sound samples are stored in the memory;
the sound separation module is used for filtering the digital signal converted by the A/D converter, comparing the digital signal with a plurality of sound samples stored in the memory and separating the sound into sound units corresponding to the sound samples in the memory;
the sound unit is stored in the memory;
the sound channel is used for displaying the sound unit on the display screen;
the voice synthesis module is used for synthesizing the voice unit;
the attenuator and the amplifier are used for adjusting the digital signal of the synthesized sound;
the frequency weighter is used for dividing digital signals of the synthesized sound into different sound levels;
the shell is provided with a display screen and a control button;
the shell is also provided with a controller;
the microphone, the preamplifier, the A/D converter, the memory, the sound separation module, the detector, the sound channel, the sound synthesis module, the attenuator, the amplifier and the frequency weight counter are respectively in control connection with the controller;
the display screen and the control button are respectively connected with the controller in a control way;
a storage battery: the storage battery is arranged in the shell, is electrically connected with the controller and is used for supplying power to the controller;
a charging port for charging the storage battery is arranged on the shell.
Has the advantages that: the utility model discloses a sound level meter can be when carrying out the environmental monitoring, pedestrian's speech sound in the mixed sound signal that will gather, the bird is called, cicada sings etc. and mixes sound together and carries out the one-by-one separation and forms sound unit, thereby can separate out steady state interference noise from the mixed sound signal of monitoring when separating into sound unit to mixed sound signal, avoid interference noise to cause the interference to sound environment monitoring result, filter sound unit through the sound passageway, then synthesize the sound unit who remains through the sound synthesis module, then to the adjustment of synthetic sound process attenuator and amplifier, make synthetic sound can match with the frequency weight counter, make the frequency weight counter carry out the frequency weight to synthetic sound (the mixed sound of removing the interference sound), and show the result on the display screen; the real validity and the accuracy of the monitoring data collected by the sound level meter are ensured, and the monitoring work is ensured to have higher efficiency.
Furthermore, the system also comprises a D/A converter and a loudspeaker, wherein the D/A converter is used for converting the digital signal in the sound channel into a sound signal, the loudspeaker is used for playing the sound signal converted by the D/A converter, and the D/A converter and the loudspeaker are respectively connected with the controller in a control mode.
Has the advantages that: the arrangement of the D/A converter and the loudspeaker can further ensure that the separated sound units are auditioned, so that the mixed interference sound in the mixed sound signal collected by the sound level meter can be deleted on the audition basis.
The microphone is arranged above the shell and protrudes out of the shell.
Has the advantages that: the microphone can collect sound better.
The end cover of the microphone is provided with sound-absorbing cotton.
Has the advantages that: the microphone is ensured to have better sound receiving effect.
The controller is a single chip microcomputer.
Has the advantages that: the singlechip is economical and practical as the controller of the sound level meter.
Drawings
Fig. 1 is a schematic view of the connection structure of the controller and each component of the sound level meter capable of eliminating steady-state interference sound according to the present invention;
fig. 2 is a logic block diagram of the sound level meter capable of eliminating steady-state interference sound of the present invention;
fig. 3 is a display interface of the sound level meter capable of eliminating steady-state interference sound;
fig. 4 is a display interface of the sound level meter capable of eliminating steady state interference sound;
fig. 5 is a schematic structural diagram of the sound level meter capable of eliminating steady-state interference sound of the present invention.
Reference numerals: 1-a shell; 2-sound absorbing cotton; 3-a display screen; 4-a loudspeaker; 5-control buttons.
Detailed Description
The following describes the sound level meter capable of eliminating the steady-state interference sound according to the present invention in further detail with reference to the accompanying drawings and the following detailed description:
as shown in fig. 1, fig. 2 and fig. 5, the sound level meter capable of eliminating the steady-state interference sound of the present invention includes a rectangular casing 1, and a microphone is disposed in the casing 1, and in this embodiment, the microphone is used for collecting sound. In order to facilitate the microphone to collect sound, the microphone is arranged on the top of the shell 1 and protrudes out of the shell 1, one end of the microphone, which is far away from the shell 1, is a spherical body, and the spherical body is covered with sound-absorbing cotton 2, so that the microphone has a better sound-receiving effect. In this embodiment, the microphone is a condenser microphone, which is model number RODE NT 55.
The front side of the shell 1 is sequentially provided with a display screen 3, a loudspeaker 4 and control buttons 5 from top to bottom, wherein the control buttons 5 comprise a switch button for controlling the starting and stopping of the sound level meter, and buttons for selecting sound channels, such as an upward moving button, a downward moving button, a leftward moving button, a rightward moving button, a determining button and the like.
The shell 1 is internally provided with a preamplifier, the preamplifier is used for amplifying the mixed sound signals collected by the microphone, and the type of the amplifier is SXO-4Q.
An a/D converter for converting the mixed sound signal amplified by the preamplifier into a digital signal is provided in the housing 1.
A memory is provided in the housing 1, in which a plurality of sound samples are stored, in the present embodiment, the plurality of sound samples include bird song, cicada song, voice of a person speaking, and the like, and the plurality of sound samples are stored in the memory in the form of digital signals.
The shell 1 is provided with a sound separation module, the sound separation module is used for filtering the digital signal converted by the A/D converter, comparing the collected mixed sound with the sound sample in the memory, separating the sound into sound units corresponding to the sound sample in the memory, and storing the sound units in the memory. The sound separation module of the present invention is a prior art, for example, the authorized announcement number is CN100585701C, and the sound separation device is not described in detail herein.
As shown in fig. 3 and 4, a plurality of sound channels are arranged in the housing 1, the sound channels are arranged on the display screen, and under the control of the controller, the sound channels are used for visually displaying a plurality of sound units separated by the sound separation module. Moreover, the sound channel can be screened to sound unit, and is concrete, when clicking sound channel operating button, pop out two secondary buttons of "audition" and "shielding" on the display screen, when clicking "audition" button, can audition this passageway sound, when clicking "shielding" button, can shield this passageway sound, no longer participates in the sound level calculation of follow-up flow after the sound channel is shielded.
A D/a converter is disposed in the housing 1, and the D/a converter is used to convert the digital signal of the sound unit in the sound channel into a sound signal, so as to provide conditions for playing the sound unit in the sound channel.
The shell is also provided with a loudspeaker, under the action of the controller, when the trial listening button is clicked, the sound unit passing through the D/A converter is played through the loudspeaker, whether the sound unit belongs to interference sound or not is judged by playing the sound unit, and if the sound unit belongs to the interference sound, the sound unit is shielded by clicking the shielding button.
The shell is internally provided with a sound synthesis module which is used for synthesizing the sound units screened by the sound channels, in the embodiment, the sound synthesis module is used for synthesizing the reserved sound units, and digital signals of the synthesized sound are stored in the memory; the sound synthesis module is prior art and will not be described herein.
The housing 1 is provided with an attenuator and an amplifier, the attenuator and the amplifier can adjust the digital signal of the synthesized sound, for example, amplify the digital signal which cannot be identified by the frequency weighter, and attenuate the digital signal which exceeds the reference of the frequency weighter, so as to facilitate the frequency weighter to process the digital signal of the sound, the type of the attenuator is MAATCC0005, and the type of the amplifier is BUF 602.
A frequency weighter is arranged in the housing 1 and is used for dividing digital signals of the synthesized sound adjusted by the attenuator and the amplifier into different sound levels. In this embodiment, the common frequency weighter (frequency weighting network) in the sound level meter has A, B, C, D four standard weighting networks: the A network simulates the response of human ears to the frequency characteristic of low-intensity noise (namely, pure sound with 40 squares in a equal loudness curve) below 55dB, and the curve shape of a noise meter of the A network is opposite to that of the equal loudness curve with 340 squares, so that the middle and low frequency bands of an electric signal have larger attenuation; the B network simulates the response of human ears to the frequency characteristic of B weighted sound level, namely moderate-intensity noise (namely 70 square pure tone in equal loudness curve) of 55dB to 85dB, and the B network enables low frequency bands of electric signals to have certain attenuation; the C-network simulates the response of the human ear to the frequency characteristics of high intensity noise simulating 85dB to 120dB (i.e., pure 100 square tones in the equal loudness curve), with a nearly flat response over the entire audible frequency range; the D-weighted sound level is an analog of a noise parameter and is specially used for measuring the noise of the airplane.
The term "frequency weighting network" refers to a network which uses equal loudness curve as reference, and uses some filter networks on the measuring instrument to implement different degrees of attenuation to the sound signals with different frequencies, and modifies the electric signals into approximate values in accordance with the hearing sense, so that the reading of the instrument can approximately express the response of human to the sound.
The sound pressure level measured by the weighting network is no longer the sound pressure level of the objective physical quantity, and is called weighting sound pressure level or weighting sound level, which is called sound level for short.
The casing 1 is provided with a detector, the detector is used for adjusting the digital signal of the synthesized sound after frequency weighting, and the model of the detector is AD 637.
A controller is arranged in the shell 1, and in the embodiment, the controller is an ideological semiconductor STM32F103ZET6 type single chip microcomputer; the microphone, the preamplifier, the A/D converter, the memory, the sound separation module, the sound channel, the sound synthesis module, the attenuator, the amplifier, the frequency weighting device, the wave detector, the D/A converter and the loudspeaker 4 are respectively connected with the controller in a control way; the display 3 and the control buttons 5 are also connected with the controller control.
The storage battery is arranged in the shell 1, the storage battery is electrically connected with the controller and used for supplying power to the controller, and a charging port for charging the storage battery is arranged on the shell 1.
The utility model discloses a when the sound level meter is used, condenser microphone gathers the on-the-spot mixed sound of monitoring, under the effect of controller, transmit mixed sound signal to preamplifier, preamplifier amplifies the mixed sound signal of gathering, then transmit to the AD converter again, convert sound data into digital signal through the AD converter, sound separation module reads the digital signal after the AD converter conversion and carries out filtering process, and, under the controller effect, sound separation module compares the digital signal of mixed sound with the sound sample in the memory, the sound unit that sound sample corresponds in will mixing sound separation one-tenth and the memory, at this moment, will form a plurality of sound units, a plurality of sound units are stored in the memory.
Under the control of the controller, the digital signals of the sound units can enter the corresponding sound channels. In this embodiment, each sound channel is displayed on a display screen.
Under the action of the controller, the digital signals of the sound units in the sound channels are converted into sound signals through the D/A converter, and the sound signals can be played through the loudspeaker so as to perform audition on the separated sound units. The sound channels filter the sound units, and when a certain sound channel is selected by the control button, the sound channel displays two dialog boxes for trial listening and masking under the action of the controller, as shown in fig. 3 and 4.
And selecting the audition dialog box, and playing the sound unit in the sound channel through the loudspeaker. When a loudspeaker plays a sound unit in a sound channel, whether the sound unit belongs to interference sound is further judged through human hearing, if the sound unit does not belong to the interference sound, a 'shielding' button is not clicked, the sound unit is reserved and participates in subsequent sound level calculation; if the judgment result shows that the sound unit belongs to the interference sound, a 'shielding' button is selected, and the sound unit is shielded from the sound channel and does not participate in the subsequent sound level calculation.
Under the action of the controller, an unshielded (reserved) sound unit synthesizes a sound signal through a sound synthesis module, the synthesized sound is stored in a memory, and under the action of the controller, the synthesized sound is adjusted through an attenuator and an amplifier; then the digital signal of the synthetic sound enters a frequency weight meter, and the frequency weight meter forms sound level data after the digital signal of the synthetic sound is subjected to subsequent operation processing and displays the sound level data on a display screen.
The utility model discloses a sound level meter can carry out sound separation with the sound signal who gathers, then reject the interference sound in the sound signal who gathers, then synthesize the sound unit that will remain, synthetic sound is the sound signal who does not contain the interference sound, then carry out the sound level to rejecting the post-interference sound signal and calculate, thereby make the synthetic sound of calculating the sound level press close to the sound signal of ideal (do not contain the interference sound), thereby it is more accurate to guarantee to calculate the sound level that obtains, guarantee the true validity and the accuracy of the monitoring data that the sound level meter gathered, and then make monitoring work have higher efficiency.
In the above embodiment, the audio player further includes a D/a converter and a speaker, the D/a converter is configured to convert the digital signal in the audio channel into an audio signal, the speaker is configured to play the audio signal converted by the D/a converter, and the D/a converter and the speaker are respectively connected to the controller; in other embodiments, the D/a converter and the speaker may not be provided, and the mixed sound signal is separated and subjected to sound level division only by the sound separation module.
In the above embodiment, the microphone is disposed on the top of the housing and protrudes from the housing; in other embodiments, the microphone is disposed on and flush with the top of the housing.
In the above embodiment, the end of the microphone is sleeved with sound absorbing cotton; in other embodiments, the sound-absorbing cotton may not be provided.
In the above embodiment, the controller is a single chip microcomputer; in other embodiments, the controller may also be an ARM architecture low power processor, such as KIRIN series, high-pass 800 series, and 700 series processors, and accordingly, if the above processor is used, the operating system of the sound level meter is changed to an operating system supporting the above CPU.
Claims (5)
1. A sound level meter capable of eliminating steady-state interference sound is characterized by comprising:
a housing;
the casing is provided with a microphone, a preamplifier, an A/D converter, a memory, a sound separation module, a sound channel, a sound synthesis module, an attenuator, an amplifier, a frequency weight counter and a wave detector;
the microphone is used for collecting sound;
the preamplifier is used for amplifying the sound collected by the microphone;
the A/D converter is used for converting the sound signal amplified by the preamplifier into a digital signal;
a plurality of sound samples are stored in the memory;
the sound separation module is used for filtering the digital signal converted by the A/D converter, comparing the digital signal with a plurality of sound samples stored in the memory and separating the sound into sound units corresponding to the sound samples in the memory;
the sound unit is stored in the memory;
the sound channel is used for displaying the sound units on the display screen and screening the sound units;
the voice synthesis module is used for synthesizing the reserved voice units;
the attenuator and the amplifier are used for adjusting the digital signal of the synthesized sound;
the frequency weighter is used for dividing digital signals of the synthesized sound into different sound levels;
the shell is provided with a display screen and a control button;
the shell is also internally provided with a controller;
the microphone, the preamplifier, the A/D converter, the memory, the sound separation module, the sound channel, the sound synthesis module, the attenuator, the amplifier, the frequency weighting device and the wave detector are respectively in control connection with the controller;
the display screen and the control button are respectively connected with the controller in a control way;
a storage battery: the storage battery is arranged in the shell, is electrically connected with the controller and is used for supplying power to the controller;
a charging port for charging the storage battery is arranged on the shell.
2. The sound level meter capable of eliminating the steady state interference sound as claimed in claim 1, further comprising a D/a converter and a speaker, wherein the D/a converter is used for converting the digital signal in the sound channel into the sound signal, the speaker is used for playing the sound signal converted by the D/a converter, and the D/a converter and the speaker are respectively connected with the controller.
3. A sound level meter with elimination of stationary disturbing sounds according to claim 1 or 2, characterized in that the microphone is arranged on top of the housing and protruding from the housing.
4. A sound level meter capable of eliminating steady-state interfering sounds according to claim 3, wherein the end of the microphone is sleeved with sound absorbing cotton.
5. A sound level meter capable of eliminating steady-state interfering sounds according to claim 1 or 2, wherein the controller is a single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123147227.3U CN217306099U (en) | 2021-12-15 | 2021-12-15 | Sound level meter capable of eliminating steady-state interference sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123147227.3U CN217306099U (en) | 2021-12-15 | 2021-12-15 | Sound level meter capable of eliminating steady-state interference sound |
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| Publication Number | Publication Date |
|---|---|
| CN217306099U true CN217306099U (en) | 2022-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123147227.3U Active CN217306099U (en) | 2021-12-15 | 2021-12-15 | Sound level meter capable of eliminating steady-state interference sound |
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|---|---|
| CN (1) | CN217306099U (en) |
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2021
- 2021-12-15 CN CN202123147227.3U patent/CN217306099U/en active Active
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