CN214065040U - Evaluation device for sound quality of range hood and range hood - Google Patents

Abstract

The utility model provides an evaluation device and lampblack absorber of lampblack absorber sound quality, include: the device comprises a first acquisition module and an evaluation result determination module; the first acquisition module is connected with the evaluation result determination module; the first acquisition module is used for acquiring an electroencephalogram signal of a testee; the electroencephalogram signals comprise first concentration data of a testee in a quiet state and second concentration data of the testee in an original noise state; and the evaluation result determining module is used for processing the first concentration data and the second concentration data and outputting an evaluation result of the sound quality of the range hood. According to the method, the electroencephalogram signals of a testee in a quiet state and an original noise state of the range hood can comprehensively represent the influence of a noise quality on subjective perception of a user, the real perception difference of the noise quality and the user is small, the electroencephalogram signals are processed to output the evaluation result of the sound quality of the range hood, and the accuracy of detecting the sound quality of the range hood is improved.

Description

Evaluation device for sound quality of range hood and range hood

Technical Field

The utility model belongs to the technical field of lampblack absorber sound quality technique and specifically relates to an evaluation device and lampblack absorber of lampblack absorber sound quality are related to.

Background

In the related art, the sound quality of the range hood is generally evaluated by using a sound power level or a sound pressure level, and the mode can detect the relative magnitude of noise; in addition, a smoke ventilator sound quality evaluation model can be constructed through subjective evaluation, objective parameter extraction and regression fitting so as to evaluate the sound quality of the smoke ventilator; however, the above method cannot completely represent the influence of the noise quality on the subjective perception of the user, and has a large difference from the real feeling of the user, and is easily influenced by the subjective factors of the user, so that the accuracy rate of detecting the sound quality of the range hood is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an evaluation device and lampblack absorber of lampblack absorber sound quality to improve the rate of accuracy that detects lampblack absorber sound quality.

The utility model provides an evaluation device of lampblack absorber sound quality, include: the device comprises a first acquisition module and an evaluation result determination module; the first acquisition module is connected with the evaluation result determination module; the first acquisition module is used for acquiring an electroencephalogram signal of a testee; the electroencephalogram signals comprise first concentration data of a testee in a quiet state and second concentration data of the testee in an original noise state; and the evaluation result determining module is used for processing the first concentration data and the second concentration data and outputting an evaluation result of the sound quality of the range hood.

Further, the subject includes a plurality; the evaluation result determination module further includes: a concentration coefficient determining unit configured to calculate, for each subject, a ratio of second concentration data to first concentration data of the subject, and determine the ratio as a concentration coefficient of the subject; and the result evaluation module is used for calculating the average value of the partial concentration coefficients and outputting the average value as the evaluation result of the sound quality of the range hood.

Further, the apparatus further comprises: the second acquisition module is used for acquiring third concentration data of the testee in the target audio signal state; wherein the target audio signal includes: and filtering the audio signal after the specified audio signal corresponding to the specified frequency from the original noise. And the key frequency determining module is used for processing the first concentration data, the second concentration data and the third concentration data and outputting key frequencies influencing the sound quality of the range hood.

Furthermore, the device also comprises an audio signal processing module, wherein the audio signal processing module is connected with the second acquisition module; the audio signal processing module is used for: collecting an original audio signal of the range hood, and acquiring a specified frequency meeting a preset sound intensity in the original audio signal; wherein the specified frequency comprises one or more; and for each specified frequency, filtering out the specified audio signal corresponding to the specified frequency in the original audio signal, and outputting the target audio signal corresponding to the specified frequency.

Further, the target audio signal includes one or more of; the subject includes a plurality of; the critical frequency determination module is further to: for the designated frequency corresponding to each target audio signal, the following operations are executed: calculating the ratio of the second concentration data to the first concentration data of each testee, and determining the ratio as a first concentration coefficient of the testee; calculating a first average of a portion of the first concentration coefficients; calculating the ratio of the third concentration data to the first concentration data for each testee, and determining the ratio as a second concentration coefficient of the testee; calculating a second average value of a portion of the second concentration coefficients; and calculating a difference value between the second average value and the first average value, and if the difference value meets a preset specified difference value, determining the specified frequency corresponding to the target audio signal as a key frequency influencing the sound quality of the range hood.

Further, the critical frequencies include one or more; the device also comprises a filtering module; the filtering module is connected with the evaluation result determining module; the filtering module is used for: and filtering an audio signal corresponding to the key frequency of the original noise of the range hood.

Further, the critical frequencies include one or more; the device also comprises a noise reduction module; the noise reduction module is connected with the evaluation result determination module; the noise reduction module is used for: and outputting a sound signal opposite to the audio signal corresponding to the key frequency in the original noise by using the active noise reduction function of the range hood when the range hood is in the starting state, and removing the audio signal corresponding to the key frequency of the original noise of the range hood.

Further, the device also comprises a verification module; the verification module is connected with the noise reduction module; the verification module is to: collecting fourth concentration data of a testee in a state that the range hood is started to have an active noise reduction function; if the fourth concentration data is larger than the second concentration data, confirming that the noise influencing the sound quality of the range hood is removed and the active noise reduction function is effective; if the fourth concentration data is less than or equal to the second concentration data, the sound signal is adjusted through the noise reduction module, the audio signal corresponding to the key frequency of the original noise of the range hood is removed, and the fourth concentration data is larger than the second concentration data.

Furthermore, the device also comprises electroencephalogram signal acquisition equipment; the electroencephalogram signal acquisition equipment is in communication connection with the first acquisition module and the second acquisition module respectively; the EEG signal acquisition equipment is used for: collecting an electroencephalogram signal of a subject; extracting concentration data of the electroencephalogram signals from specified wave signals of the electroencephalogram signals; and sending the concentration ratio data to a first acquisition module and a second acquisition module.

Further, the electroencephalogram signal acquisition device includes: the system comprises a dry electrode contact, an electroencephalogram signal real-time acquisition chip, a signal processing circuit, a concentration calculation unit and a signal transmission module.

Further, the electroencephalogram signal acquisition device is also used for: sending the concentration ratio data to a storage device to establish a database through the storage device; the database comprises the noise of the range hood and concentration data corresponding to the noise of the range hood.

The utility model provides a range hood, include: the range hood comprises a range hood body and an evaluation device arranged in the range hood body and used for evaluating the sound quality of the range hood.

The utility model provides a pair of evaluation device and lampblack absorber of lampblack absorber sound quality, include: the device comprises a first acquisition module and an evaluation result determination module; the first acquisition module is connected with the evaluation result determination module; the first acquisition module is used for acquiring an electroencephalogram signal of a testee; the electroencephalogram signals comprise first concentration data of a testee in a quiet state and second concentration data of the testee in an original noise state; and the evaluation result determining module is used for processing the first concentration data and the second concentration data and outputting an evaluation result of the sound quality of the range hood. According to the method, the electroencephalogram signals of a testee in a quiet state and an original noise state of the range hood can comprehensively represent the influence of a noise quality on subjective perception of a user, the real perception difference of the noise quality and the user is small, the electroencephalogram signals are processed to output the evaluation result of the sound quality of the range hood, and the accuracy of detecting the sound quality of the range hood is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an evaluation device for sound quality of a range hood provided by an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another device for evaluating the sound quality of a range hood according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another device for evaluating the sound quality of a range hood according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another device for evaluating the sound quality of a range hood provided by the embodiment of the present invention;

fig. 5 is a schematic structural diagram of another device for evaluating the sound quality of a range hood according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of the range hood provided by the embodiment of the utility model.

Icon:

100-a first acquisition module; 200-an evaluation result determination module; 300-a second acquisition module; 400-a critical frequency determination module; 500-an audio signal processing module; 600-a noise reduction module; 700-electroencephalogram signal acquisition equipment; 10-a range hood body; 20-evaluation device of sound quality of range hood.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. Furthermore, it should be noted that unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

This embodiment provides an evaluation device of lampblack absorber sound quality, as shown in fig. 1, the device includes: a first acquisition module 100 and an evaluation result determination module 200; the first obtaining module 100 is connected to the evaluation result determining module 200.

A first obtaining module 100, configured to obtain an electroencephalogram signal of a subject; the electroencephalogram signals comprise first concentration data of a testee in a quiet state and second concentration data of the testee in an original noise state;

the number of the testees can be set according to actual needs, such as 20, 30, etc., and the testees generally refer to people without hearing impairment. The electroencephalogram signals can reflect the concentration state of a person, and specifically, the attention and relaxation data in the electroencephalogram signals can be extracted to measure the mental state of a testee. The brain electrical signals are electrical signals generated by human brain cells, and the spontaneous brain bioelectric potentials can be recorded by arranging dry electrodes on the surface of the scalp. The electroencephalogram signals can be divided into four frequency bands according to frequency spectrums: the delta wave frequency is 0.5-3.5Hz, and appears in the states of sleep, deep anesthesia and the like; the theta wave frequency is 4-7Hz, appears in drowsiness and is the expression of central nervous system inhibition; the frequency distribution of alpha waves is 8-13Hz, and the alpha waves are most obvious in occipital pages and top leaf climate parts; the frequency of the beta wave is 13-30Hz, and is influenced by psychological activities, and the beta wave with the frequency of 20-30 Hz appears when the central nervous system is in strong activity or tension. Based on the electroencephalogram chip, the concentration index in the beta wave can be extracted to represent the concentration degree of the testee. Since noise can cause distraction and anxiety of listeners, thereby affecting the concentration index in brain waves, the brain electrical signals can be used to evaluate the sound quality level of the noise.

The quiet state can be a state that the test environment is a noise-eliminating and lightless environment, and meanwhile, the testee also needs to keep a quiet state; the original noise state can be the state of original noise generated when the range hood is in the starting state, and the noise can be directly generated by the range hood in the working state or played back by a stereo audio player; for example, the tested person is located 10cm away from the cabinet in front of the range hood, wherein the range hood is in an open state, or the tested person is in a playback space where original noise is played, and is not affected by external light sources and sound. The concentration data is usually extracted from beta waves in original electroencephalogram signals, and the larger the concentration data value is, the more concentrated the attention of a human body is, the smaller the interference from the outside is, and the better the sound quality is.

Specifically, the first concentration data may be concentration data within a specified time period (the time period may range from 20 s to 40 s) when the subject is in a quiet state; the second concentration data may be concentration data within a specified duration (the duration range may be 20-40 s) when the subject is in the range hood noise state.

And the evaluation result determining module 200 is used for processing the first concentration data and the second concentration data and outputting an evaluation result of the sound quality of the range hood.

Because noise can generate annoyance to human stimulation and influence attention and concentration, the electroencephalogram concentration data can be used for auxiliary evaluation of noise quality and quality. Specifically, after the first obtaining module receives the electroencephalogram signals of a plurality of testees, the evaluation result determining module can be used for outputting the evaluation result of the sound quality of the range hood.

During actual implementation, the first concentration data and the second concentration data of each testee are input into an evaluation result determining module, and an evaluation value of each tester for the noise of the range hood can be obtained according to a preset processing mode; because each testee has individual difference, the average value of the evaluation values of a plurality of testees for the noise of the range hood can be calculated, the median of the evaluation values of the plurality of testees for the noise of the range hood can also be calculated, and the like, and finally, the calculation result is output as the evaluation result of the sound quality of the range hood.

The utility model provides a pair of evaluation device of lampblack absorber sound quality, include: the device comprises a first acquisition module and an evaluation result determination module; the first acquisition module is connected with the evaluation result determination module; the first acquisition module is used for acquiring an electroencephalogram signal of a testee; the electroencephalogram signals comprise first concentration data of a testee in a quiet state and second concentration data of the testee in an original noise state; and the evaluation result determining module is used for processing the first concentration data and the second concentration data and outputting an evaluation result of the sound quality of the range hood. The electroencephalogram signals of the testee in the quiet state and the original noise state of the range hood can comprehensively represent the influence of noise quality on subjective perception of a user, the real perception difference of the noise quality and the user is small, the electroencephalogram signals are processed to output the evaluation result of the sound quality of the range hood, and the accuracy of detecting the sound quality of the range hood is improved.

The evaluation result determination module is further configured to: calculating the ratio of the second concentration data to the first concentration data of each testee, and determining the ratio as the concentration coefficient of the testee; and calculating the average value of the partial concentration coefficients, and outputting the average value as the evaluation result of the sound quality of the range hood.

The partial concentration data may be a partial concentration coefficient excluding a concentration coefficient that does not satisfy a preset condition. Specifically, before calculating the ratio of the second concentration data to the first concentration data of each subject, the concentration data of a plurality of subjects may be processed, and the statistical method is adopted to remove the interference data. In the actual operation process, a scoring standard is formulated according to the concentration data, and the sound quality of different range hood noises is measured by using the normalized scoring result.

For example, the sound quality of a certain range hood is evaluated, the number of the testees is N, and N is not less than 20; wherein the first concentration data of N subjects may be represented as k1_0-kN _ 0; the second concentration data of N subjects may be represented as k 1-kN; calculating the ratio of k1 to k1 — 0 to obtain a concentration coefficient x1 corresponding to the sound quality of the range hood; respectively carrying out the calculation on the concentration ratio data of each tested person to obtain concentration ratio coefficients x1-xN of N tested persons; and removing a maximum values and a minimum values in concentration coefficients X1-xN, wherein a is more than 2 and less than 8, calculating an average value X of the concentration coefficients of the rest parts, and taking the average value X as the sound quality evaluation value of the range hood.

In the mode, the noise quality of the range hood is reflected through the concentration data of the electroencephalogram signals of the testee, and the evaluation method is more suitable for the use experience of a consumer; the electroencephalogram signals correspond to the audio signals one by one, and the experience reflection of a testee can be directly recorded in real time. The influence degree of the noise of the range hood on a user can be quantitatively measured.

This embodiment still provides another kind of evaluation device of lampblack absorber sound quality, as shown in fig. 2, the device still includes: a second acquisition module 300 and a critical frequency determination module 400; the second obtaining module 300 is respectively connected to the evaluation result determining module 200 and the critical frequency determining module 400.

The second obtaining module is used for: acquiring third concentration data of a testee in a target audio signal state; wherein the target audio signal includes: and filtering the audio signal after the specified audio signal corresponding to the specified frequency from the original noise.

The specified frequency generally refers to a frequency which has a larger sound intensity in the original noise and meets the preset sound intensity; specifically, frequency points with high sound intensity can be screened out through spectrum analysis. The above-mentioned designated frequency may be one or more.

The critical frequency determination module is configured to: and processing the first concentration data, the second concentration data and the third concentration data, and outputting key frequency influencing the sound quality of the range hood.

After the sound quality of a certain range hood is determined, the key frequency influencing the sound quality of the range hood in the range hood can be further determined. Specifically, the third concentration data and the second concentration data can be compared based on the first concentration data, after the designated audio signals corresponding to the designated frequencies are removed, whether positive influence or negative influence exists on the concentration of the testee or not is judged, and if the designated audio signals corresponding to the designated frequencies are removed, the concentration of the testee is improved, so that the designated frequencies can be determined to be the key frequencies influencing the sound quality of the range hood.

Specifically, the critical frequency determination module is further configured to: for the designated frequency corresponding to each target audio signal, the following operations are executed: calculating the ratio of the second concentration data to the first concentration data of each testee, and determining the ratio as a first concentration coefficient of the testee; calculating a first average of a portion of the first concentration coefficients; calculating the ratio of the third concentration data to the first concentration data of each testee, and determining the ratio as a second concentration coefficient of the testee; calculating a second average value of a portion of the second concentration coefficients; and calculating a difference value between the second average value and the first average value, and if the difference value meets a preset specified difference value, determining the specified frequency corresponding to the target audio signal as a key frequency influencing the sound quality of the range hood.

For example, the specified frequencies satisfying the preset sound intensity in the obtained original audio signal include aHz, bHz, cHz, and dHz; detecting key frequency of a certain range hood influencing sound quality, wherein the target audio signal comprises an audio signal obtained by filtering a specified audio signal corresponding to specified frequency a Hz from original noise, an audio signal obtained by filtering a specified audio signal corresponding to specified frequency b Hz from original noise, an audio signal obtained by filtering a specified audio signal corresponding to specified frequency c Hz from original noise, and an audio signal obtained by filtering a specified audio signal corresponding to specified frequency d Hz from original noise. The third concentration data includes four kinds of third concentration data collected by the subject in the four target audio signal states. For example, for a specified frequency a Hz corresponding to the target audio signal, the number of the above-mentioned subjects is N, where N is not less than 20; wherein the first concentration data of N subjects may be represented as k1_0-kN _ 0; the second concentration data of N subjects may be represented as k 1-kN; the third concentration data of N subjects may be represented as k1_ w-kN _ w; calculating the ratio of k1 to k1 — 0 to obtain an original concentration coefficient x1 corresponding to the sound quality of the range hood; respectively carrying out the calculation on the concentration ratio data of each tested person to obtain an original concentration ratio coefficient x1-xN of N tested persons; removing a maximum values and a minimum values in the original concentration coefficient X1-xN, wherein a is more than 2 and less than 8, calculating an average value X of the original concentration coefficients of the rest part, and taking the average value X as the first average value.

Calculating the ratio of k1_ w to k1_0 to obtain a designated concentration coefficient y1 corresponding to the sound quality of the range hood; respectively carrying out the calculation on the third concentration ratio data of each testee to obtain the specified concentration ratio coefficients y1-yN of N testees; in the designated concentration coefficients Y1-yN, a maximum values and a minimum values are removed, where a is greater than 2 and less than 8, and then the average value Y of the remaining designated concentration coefficients is calculated as the second average value.

The second average value Y and the first average value X respectively represent the electroencephalogram concentration coefficient of the testee before and after filtering; calculating a difference value between the second average value Y and the first average value X, and if the difference value meets a preset specified difference value, outputting a specified frequency aHz as a key frequency influencing the sound quality of the range hood; the preset specified difference value can be set according to actual needs. Of course, if the difference does not meet the preset specified difference, the specified frequency is discarded, which indicates that the specified frequency is not the key frequency affecting the sound quality of the range hood.

It should be noted that the frequencies satisfying the preset sound intensity generally include a plurality of frequencies, and if the specified frequency includes a plurality of frequencies, for example, a Hz, b Hz, … …, p Hz; for each designated frequency, a corresponding target audio signal can be obtained, for each target audio signal, a difference value between a corresponding second average value and a corresponding first average value is obtained, and if the difference value meets a preset designated difference value, the designated frequency corresponding to the target audio signal is output as a key frequency influencing the sound quality of the range hood; it will be appreciated that each range hood may output a number of critical frequencies that affect the acoustic quality of the range hood. Of course, if the difference obtained for each designated frequency does not satisfy the preset designated difference, it indicates that the range hood does not have the key frequency affecting the sound quality of the range hood.

In the above manner, the second obtaining module is configured to obtain third concentration data of the subject in the target audio signal state; wherein the target audio signal includes: and filtering the audio signal after the specified audio signal corresponding to the specified frequency from the original noise. The critical frequency determination module is to: and processing the first concentration data, the second concentration data and the third concentration data, and outputting key frequency influencing the sound quality of the range hood. According to the method, the influence of noise quality on subjective perception of a user can be represented comprehensively by electroencephalogram signals of a testee in a quiet state, an original noise state of the range hood and a target audio signal state of the range hood; and evaluating the noise quality through the difference between the concentration coefficient corresponding to the original noise of the range hood and the concentration coefficient corresponding to the target audio signal, and screening the noise frequency which has important influence on the sound quality.

Further, referring to fig. 3, the apparatus further includes an audio signal processing module 500, where the audio signal processing module 500 is connected to the second obtaining module 300; the audio signal processing module is used for: collecting an original audio signal of the range hood, and acquiring a specified frequency meeting a preset sound intensity in the original audio signal; wherein the specified frequencies include one or more; and for each frequency, filtering out the designated audio signal corresponding to the frequency in the original audio signal, and outputting the filtered target audio signal.

The preset sound intensity may be 80% of the maximum sound intensity magnitude. For example, collecting noise audio signals of a certain range hood, obtaining frequency values of amplitude values exceeding 80% of maximum sound intensity by using an audio signal processing module through spectrum analysis, and respectively recording the frequency values as a Hz, b Hz, … … and p Hz; and filtering the original audio signal by using a Fourier transform method, removing the sound signal corresponding to the a Hz, and specifically, respectively setting the sound intensity corresponding to the a Hz frequency point to zero. A corresponding target audio signal is obtained.

Specifically, an audio signal processing module is used for collecting noise audio signals of a certain range hood, and the sound intensity corresponding to the frequencies of a Hz, b Hz, c Hz and d Hz is obtained through frequency spectrum analysis. And filtering the original audio signal to remove the a Hz signal. And respectively playing noise audios before and after filtering for a testee, and if the concentration coefficient after filtering is obviously improved, indicating that the a Hz has great influence on the noise quality of the range hood. And continuously filtering other frequencies (b Hz, c Hz and d Hz) on the basis of the original audio signal, comparing the electroencephalogram concentration data before and after processing again until all the frequencies in a-d are processed, and sorting and outputting the key frequency influencing the noise and sound quality of the range hood.

Further, the critical frequencies include one or more; referring to fig. 4, the apparatus further includes a noise reduction module 600; the noise reduction module 600 is connected to the key frequency determination module 400; the noise reduction module is used for: and outputting a sound signal opposite to the audio signal corresponding to the key frequency in the original noise by using the active noise reduction function of the range hood when the range hood is in the starting state, and removing the audio signal corresponding to the key frequency of the original noise of the range hood.

After the key frequency influencing the sound quality of the range hood is output, the audio signal corresponding to the key frequency of the original noise can be removed. Specifically, the active noise reduction function of the range hood can be utilized, the noise reduction system outputs the opposite sound wave (namely the sound signal) of the audio signal corresponding to the key frequency of the range hood, the original noise is neutralized, and the audio signal corresponding to the key frequency of the original noise of the range hood is removed.

Or, the device may further include a filtering module; the filtering module is connected with the key frequency determining module; the filtering module is used for: and filtering an audio signal corresponding to the key frequency of the original noise of the range hood. Specifically, the audio signal corresponding to the key frequency of the original noise of the range hood can be directly filtered by adopting a filtering mode.

In addition, the device can also comprise a verification module for acquiring fourth concentration data of the testee when the range hood is started to have the active noise reduction function; if the fourth concentration data is larger than the second concentration data, confirming that the noise influencing the sound quality of the range hood is removed and the active noise reduction function is effective; if the fourth concentration data is less than or equal to the second concentration data, the sound signal is adjusted through the noise reduction module, the audio signal corresponding to the key frequency of the original noise of the range hood is removed, and the fourth concentration data is larger than the second concentration data.

Specifically, the testee stands in 10cm departments of cabinet before the lampblack absorber, acquire to open the fourth concentration data of the testee after the initiative is fallen and makes an uproar, then carry out analysis comparison with the second concentration data that the testee obtained under the original noise state, the change condition of analysis testee brain electricity concentration signal, if the initiative is fallen and makes an uproar open the back concentration and promote to some extent, namely, fourth concentration data is greater than second concentration data, confirm that the noise that influences the lampblack absorber sound quality has got rid of simultaneously then explain that this initiative noise reduction scheme of use promotes effectively to the sound quality. If the electroencephalogram concentration of the testee is not improved in the original noise state, namely the fourth concentration data is smaller than or equal to the second concentration data, adjusting a sound signal opposite to an audio signal corresponding to the key frequency in the original noise through an audio adjusting function, namely installing additional audio equipment in the range hood, and then continuing to actively reduce the noise of the original noise until the concentration is improved after the noise is reduced.

In the above mode, the noise reduction module is utilized to reduce noise of the key frequency in an active noise reduction mode, and then electroencephalogram concentration data are collected to verify whether the improvement scheme is effective or not, if the improvement scheme is invalid, the noise signal is readjusted through the noise reduction module, for example, the sound signal is adjusted in an audio adjustment mode, and then the steps are repeated. Through the noise improvement scheme, the sound signal output by the range hood is adjusted, the change condition of the electroencephalogram concentration signal of the tested person is analyzed and compared, and whether the sound quality improvement scheme is effective or not can be judged quickly and accurately.

Compared with the prior art, the electroencephalogram concentration signal can quantitatively represent the influence degree of the noise of the range hood on a user; the interference of external environment and artificial subjective factors is avoided, and the accuracy and efficiency of sound quality evaluation are improved; the electroencephalogram signal is matched with the time axis of the audio signal, so that the auditory feedback of the testee can be recorded in real time; by filtering the original noise signal, the key frequencies that affect the sound quality can be found.

Further, as shown in fig. 5, the apparatus further includes an electroencephalogram signal acquisition device 700; the electroencephalogram signal acquisition equipment 700 is in communication connection with the first acquisition module 100 and the second acquisition module 300 respectively; the EEG signal acquisition equipment is used for: collecting an electroencephalogram signal of a subject; extracting concentration data in the electroencephalogram signals from the designated wave signals of the electroencephalogram signals; and sending the concentration ratio data to a first acquisition module and a second acquisition module.

The electroencephalogram signal acquisition equipment further comprises a dry electrode contact, an electroencephalogram signal real-time acquisition chip, a signal processing circuit, a concentration calculation unit and a signal transmission module.

Specifically, a testee stands in front of the range hood at a distance of 10cm from the cabinet, and electroencephalogram signal acquisition equipment is used for acquiring a first electroencephalogram signal of each testee in a calm state; the testee stands in front of the range hood at a distance of 10cm from the cabinet, the range hood is opened, and after a preset time, the electroencephalogram signal acquisition equipment is used for acquiring a second electroencephalogram signal of each testee in the original noise state; the testee stands in front of the range hood at a distance of 10cm from the cabinet, the range hood is opened, and after the preset duration, the electroencephalogram signal acquisition equipment is used for acquiring a third electroencephalogram signal of the target audio signal state of each testee.

After concentration data are acquired, signal preprocessing, such as filtering, smoothing, normalization and the like, can be performed on the electroencephalogram signals through a signal processing circuit; extracting data representing concentration in the electroencephalogram signals through a concentration calculation unit; and finally, the concentration ratio data are sent to the first acquisition module and the second acquisition module through the signal transmission module.

The electroencephalogram signal acquisition equipment is usually head-mounted equipment, and can be respectively positioned right in front of the range hood, outside a kitchen and the like during actual use to acquire concentration data of a testee; and evaluating the noise quality of the range hood. According to the noise sound power amplitude and the centralized data amplitude distribution condition at different positions, the influence range of the noise transmission of the range hood can be constructed. In addition, electroencephalogram signal acquisition equipment gradually develops towards the trend of miniaturization and convenience, and has great development potential in the fields of medical treatment, commerce and the like. At present, multi-channel electroencephalogram equipment is mostly applied to the field of medical treatment and scientific research, and meanwhile, in the field of electroencephalogram research or use scenes, the multi-channel electroencephalogram equipment generally uses wet electrodes, but the electroencephalogram equipment of the wet electrodes is complex and tedious to use, consumes time and is labor-consuming. Compared with the dry electrode electroencephalogram equipment used in the embodiment, the dry electrode electroencephalogram equipment is convenient to use, troubles such as hair washing and conductive paste coating are omitted, and the dry electrode electroencephalogram acquisition technology has the advantages of being simple to use and not prone to being restricted by the environment. The convenience of the dry electrode electroencephalogram equipment expands the application of the dry electrode electroencephalogram equipment to other aspects, and compared with the traditional wet electrode electroencephalogram equipment, the dry electrode electroencephalogram equipment is easier to use and lower in cost.

In addition, above-mentioned brain electrical signal collection equipment is still used for: sending the concentration ratio data to a storage device so that the storage device can establish a database; the database comprises the noise of the range hood and concentration data corresponding to the noise of the range hood.

The storage device can be a mobile phone, a computer, a server and other devices; generally, in the production process of the range hood, the range hood needs to be repeatedly detected; therefore, the concentration data of each testee can be sent to the storage device during each detection, so that the storage device database can be stored; the database comprises the noise of the range hood and concentration data corresponding to the noise of the range hood. When a later-stage detector detects the range hood again, concentration data in the electroencephalogram data can be extracted from the database, and the sound quality of the range hood is evaluated according to the database corresponding to the noise of the range hood and the electroencephalogram concentration data and the noise corresponding to the read concentration data; and screening the noise audio signals by adopting a signal Fourier transform filtering method to screen out key frequencies which have great influence on the noise sound quality.

In the above mode, the electroencephalogram signals of the testee are tested, the physiological influence of the noise of the range hood on the user is evaluated, and the sound quality is evaluated; the traditional sound quality evaluation method is replaced, the influence of subjective factors of a testee is avoided, and the operation flow is simplified; the influence of external environment and artificial subjective factors is avoided, and the test accuracy and efficiency are improved. Processing the audio signal in real time, filtering the original signal, judging key noise frequency influencing the concentration of the testee, and comparing and analyzing key factors influencing the concentration of the electroencephalogram signal of the testee; and actively reducing noise of the key frequency so as to improve the sound quality of the range hood.

This embodiment also provides a lampblack absorber, as shown in fig. 6, include: lampblack absorber body 10 and set up this internal evaluation device 20 of lampblack absorber sound quality of lampblack absorber.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (12)

1. An evaluation device of sound quality of a range hood, characterized by comprising: the device comprises a first acquisition module and an evaluation result determination module; the first acquisition module is connected with the evaluation result determination module;

the first acquisition module is used for acquiring an electroencephalogram signal of a testee; the electroencephalogram signals comprise first concentration data of the testee in a quiet state and second concentration data of the testee in an original noise state;

and the evaluation result determining module is used for processing the first concentration data and the second concentration data and outputting an evaluation result of the sound quality of the range hood.

2. The apparatus according to claim 1, wherein said subject includes a plurality; the evaluation result determination module further includes:

a concentration coefficient determining unit configured to calculate, for each of the subjects, a ratio of second concentration data to first concentration data of the subject, and determine the ratio as a concentration coefficient of the subject;

and the result evaluation module is used for calculating the average value of part of concentration coefficients and outputting the average value as the evaluation result of the sound quality of the range hood.

3. The apparatus of claim 1, further comprising: the second acquisition module and the key frequency determination module; the second acquisition module is respectively connected with the evaluation result determination module and the key frequency determination module;

the second acquisition module is used for acquiring third concentration data of the testee in a target audio signal state; wherein the target audio signal comprises: filtering out the audio signal after the appointed audio signal corresponding to the appointed frequency from the original noise;

and the key frequency determining module is used for processing the first concentration data, the second concentration data and the third concentration data and outputting key frequencies influencing the sound quality of the range hood.

4. The apparatus according to claim 3, further comprising an audio signal processing module, wherein the audio signal processing module is connected to the second obtaining module;

the audio signal processing module is used for:

collecting an original audio signal of the range hood, and acquiring a specified frequency which meets a preset sound intensity in the original audio signal; wherein the specified frequencies comprise one or more;

and for each type of the specified frequency, filtering out the specified audio signal corresponding to the type of the specified frequency in the original audio signal, and outputting the target audio signal corresponding to the type of the specified frequency.

5. The apparatus of claim 3, wherein the target audio signal comprises one or more of; the subject includes a plurality of; the critical frequency determination module is further to:

for each kind of designated frequency corresponding to the target audio signal, performing the following operations:

calculating the ratio of the second concentration data to the first concentration data of each testee, and determining the ratio as a first concentration coefficient of the testee; calculating a first average of a portion of the first concentration coefficients;

calculating the ratio of the third concentration data to the first concentration data of each tested person, and determining the ratio as a second concentration coefficient of the tested person; calculating a second average of a portion of the second concentration coefficients;

and calculating a difference value between the second average value and the first average value, and if the difference value meets a preset specified difference value, determining a specified frequency corresponding to the target audio signal as a key frequency influencing the sound quality of the range hood.

6. The apparatus of claim 5, wherein the critical frequencies comprise one or more; the device also comprises a filtering module; the filtering module is connected with the evaluation result determining module; the filtering module is used for:

and filtering an audio signal corresponding to the key frequency of the original noise of the range hood.

7. The apparatus of claim 5, wherein the critical frequencies comprise one or more; the apparatus also includes a noise reduction module; the noise reduction module is connected with the evaluation result determination module; the noise reduction module is configured to:

and outputting a sound signal opposite to the audio signal corresponding to the key frequency in the original noise under the starting state of the range hood by utilizing the active noise reduction function of the range hood, and removing the audio signal corresponding to the key frequency of the original noise of the range hood.

8. The apparatus of claim 7, further comprising a verification module; the verification module is connected with the noise reduction module; the verification module is to:

collecting fourth concentration data of the testee in a state that the range hood is started to have an active noise reduction function; if the fourth concentration data is larger than the second concentration data, confirming that noise influencing the sound quality of the range hood is removed and the active noise reduction function is effective;

if the fourth concentration data is smaller than or equal to the second concentration data, the sound signal is adjusted through the noise reduction module, and the audio signal corresponding to the key frequency of the original noise of the range hood is removed until the fourth concentration data is larger than the second concentration data.

9. The apparatus of claim 1, further comprising a brain electrical signal acquisition device; the electroencephalogram signal acquisition equipment is in communication connection with the first acquisition module and the second acquisition module respectively; the electroencephalogram signal acquisition equipment is used for:

collecting an electroencephalogram signal of the subject; extracting concentration data of the electroencephalogram signals from specified wave signals of the electroencephalogram signals;

and sending the concentration ratio data to the first acquisition module and the second acquisition module.

10. The apparatus of claim 9, wherein the brain electrical signal acquisition device comprises: the system comprises a dry electrode contact, an electroencephalogram signal real-time acquisition chip, a signal processing circuit, a concentration calculation unit and a signal transmission module.

11. The apparatus of claim 9, wherein the brain electrical signal acquisition device is further configured to: sending the concentration ratio data to a storage device so as to establish a database through the storage device; the database comprises the noise of the range hood and concentration data corresponding to the noise of the range hood.

12. A range hood, comprising: a range hood body and an evaluation device of the acoustic quality of the range hood according to any one of claims 1 to 11 provided in the range hood body.

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