TWI813584B - Indoor active noise reduction system - Google Patents

Abstract

An indoor active noise reduction system, the system includes a disturbance sensor, an acoustic wave generator, and a processing host. The method includes the following steps: the disturbance sensor senses the disturbance generated by the user's mouth and nose; generate a sensing signal when the disturbance intensity sensed by the disturbance sensor is greater than a predetermined threshold, the processing host drives the acoustic wave generator to generate a noise reduction wave due to the triggering of the sensing signal, and reduce the noise generated by the user.

Description

Indoor active noise reduction system

The present invention relates to an indoor active noise reduction system, and in particular, to an indoor active noise reduction system with noise sensing and automatic starting functions.

Modern people have increasingly higher requirements for the sound quality of indoor environments, especially in some special occasions, such as classical concerts or speeches, where the scene needs to be kept quiet. However, due to some uncontrollable physical conditions of the audience, such as the noise caused by coughing or sneezing, the tranquility of the scene will be affected. However, no effective equipment has been developed to eliminate this problem.

The purpose of the present invention is to provide an indoor active noise reduction system to actively eliminate the noise caused by coughing or sneezing. The system in this case may include: a disturbance sensor that is close to a user and is used to sense the user's mouth. The disturbance emitted by the nose generates a sensing signal; a sound wave generator; and a processing host, the signal is connected to the disturbance sensor and the sound wave generator, the processing host drives the sound wave in response to the triggering of the sensing signal The generator generates a noise reduction wave to reduce the noise emitted from the user's mouth and nose.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the disturbance sensor includes a sound sensor for sensing that the noise intensity emitted from the user's mouth and nose is greater than a preset threshold and immediately A sensing signal is generated and transmitted to the processing host. The processing host drives the sound wave generator to generate the noise reduction wave in response to the triggering of the sensing signal. The noise reduction wave is an inverse sound wave that simulates the noise sound wave emitted by the user. , and the waveform data of the noise reduction wave is pre-stored in the sound wave database of the processing host.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the sound sensor is integrated in the oral and nasal appliance and has a start switch. The start switch allows the sound sensor to be in a closed state normally. When the user feels that he or she wants to cough or sneeze, the user covers the mouth and nose with the mouth and nose appliance and uses the activation switch to turn on the sound sensor.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the activation switch is a capacitive sensor provided at the mouth and nose contact point of the mouth and nose appliance. When the user places the mouth and nose appliance on the mouth and nose, When turned on, the change in coupling capacitance is sensed, and the sound sensor is automatically activated.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the sensing signal contains noise intensity information, and the noise intensity information is provided to the processing host for reference to determine whether the sound wave generator generates the noise intensity information. Reduce the intensity of noise waves.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the waveform data of noise reduction waves pre-stored in the sound wave database is a plurality of groups of noise reduction waves. Spectral characteristic values. Each set of noise reduction wave spectrum characteristic values is used to represent the spectrum distribution characteristics of a corresponding noise reduction wave, which is obtained through actual sampling of different users.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the sound sensor is integrated in the oral and nasal appliance and has a wireless signal module for sending the sensing signal to the processing unit in a wireless signal manner. host.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the disturbance sensor includes an airflow sensor for sensing local changes in the airflow at the user's mouth and nose. signal.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the disturbance sensor includes a sound sensor and an airflow sensor. The sound sensor senses the intensity of the noise emitted from the user's mouth and nose. When the airflow sensor detects a local change in the airflow at the user's mouth and nose, it immediately generates the sensing signal and sends it to the processing host.

According to the indoor active noise reduction system according to the preferred embodiment of the present invention, the mouth and nose appliance is disposable, and the sound sensor and the activation switch are detachable.

Another aspect of the present invention is an indoor active noise reduction method, which includes the following steps: sensing disturbances generated by a user's mouth and nose; generating and sending a sensing signal when the intensity of the sensed disturbance is greater than a preset threshold; A noise reduction wave is generated due to the triggering of the sensing signal, which reduces the noise emitted from the user's mouth and nose.

According to the indoor active noise reduction method according to the preferred embodiment of the present invention, the sensing signal contains noise intensity information, and the noise intensity information is used to determine the intensity of the generated noise reduction wave.

According to the indoor active noise reduction method according to the preferred embodiment of the present invention, the disturbance generated at the user's mouth and nose includes local changes in the airflow at the user's mouth and nose.

According to the indoor active noise reduction method according to the preferred embodiment of the present invention, the disturbance generated by the user's mouth and nose includes noise generated by the user's mouth and nose.

In order to make the above and other objects, features and advantages of the present invention more clearly understood, preferred embodiments are described in detail below along with the accompanying drawings.

101~105: Seats

2: System

21: Disturbance sensor

210: Sound sensor

211:Airflow sensor

22: Processing host

23:Sound wave generator

S: sensing signal

11:stage

31:Oral and nasal appliances

32:Independent power supply

33:Wireless signal module

34: Start switch

220:Sound wave database

310: Zipper bag

40: Electronic devices

Figure 1 is a functional block diagram of the indoor active noise reduction system developed in this case.

Figure 2 is a functional block diagram of a miniaturized sound sensor.

Figure 3 is a schematic diagram of the appearance of the mouth and nose appliance integrated with electronic devices developed in this case.

Figure 4 is a schematic flow chart of the indoor active noise reduction method proposed in this case.

Some typical embodiments in which the features and advantages of the present invention can be realized will be described in detail in the subsequent description. It should be understood that the present invention can have various changes in different aspects without departing from the scope of the technical solution of the present invention, and the description and drawings are essentially for illustration, not limitation. invention.

Please refer to Figure 1, which is a functional block diagram of the indoor active noise reduction system developed in this case. The environment is illustrated by taking indoor spaces 1 that require quietness and no sound disturbance, such as concert halls, conference halls, or recording studios, as examples. Indoor spaces There are usually multiple seats in 1, represented by seats 101 to 105 in this figure. In this example, the user sits in seat 101, while the performer or speaker is located on stage 11 in the distance. The system 2 in this case includes at least one disturbance sensor 21, a processing host 22 and a sound wave generator 23. The disturbance sensor 21 can be installed on or near the seat 101 to approach the user sitting on the seat 101. The disturbance sensor 21 may include a sound sensor 210 and an airflow sensor 211. The sound sensor 210 is used to sense whether the intensity of the noise emitted by the user's mouth and nose is greater than a preset threshold, and the airflow The detector 211 is used to sense whether there is a local change in the airflow at the user's mouth and nose that is greater than a preset value. In one embodiment, the airflow sensor 211 can play the same role as the sound sensor 210 in the disturbance sensor 21. When either the sound sensor 210 or the airflow sensor 211 senses If the air flow change or noise intensity emitted to the user's mouth and nose is greater than the preset threshold, a sensing signal can be immediately generated and sent to the processing host.

In another embodiment, the airflow sensor 211 can be used as a wake-up mechanism in the power saving state. For example, when the indoor active noise reduction system is in a state where most circuits are powered off, the airflow sensor 211 may be on. Start the state and monitor the gas flow. When the local change of the airflow at the user's mouth and nose is greater than the preset value, it means that something may be happening, and a wake-up signal can be generated to wake up the entire system and turn off the noise reduction. The task is given to the sound sensor 210 in the disturbance sensor 21 to perform the following steps.

Of course, in another embodiment, the disturbance sensor 21 may also include only the sound sensor 210 or only the airflow sensor 211. The subsequent embodiments will take the example of including only the sound sensor. to explain.

The sound sensor can be a microphone or other sensing element that can convert sound waves or related vibrations into electromagnetic signals. Therefore, the disturbance sensor 21 completed by the sound sensor 21 can be used to sense the user's mouth and nose. Noise (mainly coughing or sneezing). When the disturbance sensor 21 senses noise (cough or sneeze), it immediately generates a sensing signal S. The processing host 22 is coupled to the disturbance sensor 21 through a signal connection or a direct electrical connection. The processing host 22 mainly drives the sound wave generator 23 to generate a signal in response to the triggering of the sensing signal S. Noise reduction wave, the waveform of the noise reduction wave is mainly the inverse waveform of the cough or sneeze waveform. The purpose of the noise reduction wave is to superimpose it with the noise emitted by the user (mainly cough or sneeze) and eliminate it. The sound wave generator 23 can also be positioned between the seat 101 and the distant stage 11, or even close to the stage 11, to eliminate the mouth and nose noise (coughing or sneezing) originally transmitted to the stage 11. Details and different variations of the disturbance sensor 21, the processing host 22, and the sound wave generator 23 will be described below.

First, please refer to Figure 2, which is a functional block diagram of a miniaturized sound sensor. In this system, the disturbance sensor 21 is completed with a sound sensor. It can be integrated into mouth and nose appliances 31 such as handkerchiefs or masks, and can also have an independent power supply 32, a wireless signal module 33 and a start switch 34. The start switch 34 can keep the disturbance sensor 21 in a closed state to avoid malfunction. When the user feels that he wants to cough or sneeze, he covers the mouth and nose with the mouth and nose appliance 31 and presses the activation switch 34 to turn on the disturbance sensor 21 . In this way, when the disturbance sensor 21 is turned on, it can be used to sense whether the user emits noise whose volume intensity exceeds a preset threshold. If so, the sensing signal S is sent through the wireless signal module 33 to the processing host 22, causing the processing host 22 to trigger the sound wave generator 23 to generate a noise reduction wave in response to the sensing signal S. The noise reduction wave is mainly an inverse sound wave that simulates the noise wave (cough sound wave or sneeze sound wave) emitted by the user, and is used to offset and weaken the noise emitted by the user. The waveform data of the noise reduction wave can be pre-stored in the processing host In the sound wave database 220 of 22, the waveform data of the noise reduction wave can be a general cough sound wave or a sneeze sound wave, through the user's selection of the type on the activation switch 34 (for example, the first button is sneeze, the second button is cough) to emit corresponding noise reduction waves. The sensing signal S here can be a simple trigger signal, or a trigger signal with only noise intensity information. The noise intensity information can be provided to the processing host 22 for reference to determine the sound wave generator 23 to generate. Reduce the intensity of noise waves.

In addition, the waveform data of noise reduction waves pre-stored in the acoustic wave database 220 of the processing host 22 may be multiple sets of noise reduction wave spectrum characteristic values, and each set of noise reduction wave spectrum characteristic values is used to represent the spectral distribution characteristics corresponding to a noise reduction wave. The noise reduction wave spectrum characteristic values corresponding to several basic types of coughs or sneezes can be pre-stored in the sound wave database 220 of the processing host 22 through actual sampling of different users, so that the processing host 22 can select among them. One set for use. The method of choice can Either it is played to the user in advance so that the user can manually select a sound type that sounds closer, or the user is asked to cough or sneeze first to directly sample and generate a noise-reducing wave spectrum characteristic value, and then save it to in the acoustic wave database 220 of the processing host 22. The intensity of the noise reduction wave finally generated by the sound wave generator 23 can be adjusted according to the volume detected by the disturbance sensor 21 .

In addition, the content of the sensing signal S generated by the disturbance sensor 21 based on the noise whose volume intensity exceeds the preset threshold value can also be a set of noise reduction wave spectrum characteristic values obtained from actual sampling, which is directly transmitted to the processing host 22 so that The sound wave generator 23 can directly generate corresponding noise reduction waves according to the set of noise reduction wave spectrum characteristic values. In addition to being integrated into a handkerchief or a mask, the miniaturized disturbance sensor 21 can also be fixed near the headrest of the seat 101, the purpose of which is to be close to the user's voicing position. In addition to being a physical key switch, the start switch 34 can also be a start switch implemented by a touch sensor. For example, it can be a capacitive sensor provided at the mouth and nose contact point of the mouth and nose appliance 31 for use. When the user places the mouth and nose appliance 31 on the mouth and nose, the change in coupling capacitance can be sensed, and the disturbance sensor 21 is automatically activated. Of course, the processing host 22 and the sound wave generator 23 can simultaneously process the disturbance sensors 21 on other seats near the seat 101. Therefore, the processing host 22 can correspond to multiple disturbance sensors 21 at the same time, and then drive the sound wave generator 23 to generate signals respectively. Multiple noise reduction waves.

Since the mouth and nose appliance 31 is easily contaminated by individuals, it can be designed to be disposable and have a detachable design with the disturbance sensor 21 , independent power supply 32 , wireless signal module 33 and activation switch 34 . For example, the disturbance sensor 21, the independent power supply 32, the wireless signal module 33 and the activation switch 34 are integrated into one electronic device. 40, and the mouth and nose appliance 31 completed with a mask has a zipper bag 310 to place the electronic device 40. Please refer to Figure 3 for related drawings. These mouth and nose appliances 31 integrated with electronic devices can be placed at the entrance of indoor spaces 1 that require quietness and no sound disturbance, such as concert halls, conference halls or recording studios, so that people in need can take them by themselves.

Please refer to Figure 4, which is a schematic flow chart of the indoor active noise reduction method proposed in this case. First, a disturbance sensor can be used to sense disturbances (noise or local changes in airflow) emitted by the user's mouth and nose (step 50) , the sound sensor determines whether the sensed disturbance intensity is greater than a preset threshold (step 51). If not, return to step 50 to continue sensing. If so, a sensing signal is generated (step 52) and sent to the processing host; the processing host generates a noise reduction wave (step 53) in response to the triggering of the sensing signal, which will reduce the noise emitted from the user's mouth and nose. , and the sensing signal may contain a noise intensity information, and the noise intensity information is used to determine the intensity of the generated noise reduction wave.

Of course, the sound sensor, processing host, sound wave generator and other components in this case can all be completed by finding corresponding hardware on the smartphone. Therefore, the above indoor active noise reduction method can be completed in the form of an application. It is installed on a smartphone. When necessary, running this application on the smartphone can also achieve the function of the indoor active noise reduction system. Therefore, this application can be placed in the cloud. It is provided to the audience entering the concert hall to download and install.

In summary, the present invention can provide an indoor active noise reduction device and method to achieve the effect of eliminating mouth and nose noise. Although the present invention has been disclosed above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope of the patent application attached.

101~105: Seats

2: System

21: Disturbance sensor

210: Sound sensor

211:Airflow sensor

22: Processing host

23:Sound wave generator

S: sensing signal

11:stage

Claims (12)

An indoor active noise reduction system, which includes: a disturbance sensor, which is close to a user. The disturbance sensor includes a sound sensor, which is used to sense that the noise intensity emitted by the user's mouth and nose is greater than a predetermined value. Setting a threshold value immediately generates a sensing signal, and the sound sensor is integrated in the oral and nasal appliance and has a start switch. The start switch allows the sound sensor to be in a closed state normally. When the user feels the desired When you want to cough or sneeze, cover the mouth and nose with the mouth and nose appliance and use the activation switch to turn on the sound sensor; the sound wave generator; and a processing host, the signal is connected to the disturbance sensor With the sound wave generator, the awakened processing host drives the sound wave generator to generate a noise reduction wave in response to the triggering of the sensing signal to reduce the noise emitted from the user's mouth and nose. For example, the indoor active noise reduction system described in item 1 of the patent application, wherein the noise reduction wave is an inverse sound wave that simulates the noise sound wave emitted by the user, and the waveform data of the noise reduction wave is pre-stored in the sound wave processing host in the database. For example, in the indoor active noise reduction system described in item 1 of the patent application, the disturbance sensor generates a wake-up signal to change the entire system when the local change in the airflow at the user's mouth and nose is greater than a preset value. Wake up from power saving state. The indoor active noise reduction system described in item 1 of the patent application, wherein the activation switch is a capacitive sensor located at the mouth-nose contact point of the mouth-nose appliance When the user places the mouth and nose appliance on the mouth and nose, the change in coupling capacitance is sensed, and the sound sensor is automatically activated. For example, in the indoor active noise reduction system described in item 1 of the patent application, the sensing signal contains noise intensity information, and the noise intensity information is provided to the processing host for reference to determine the output of the sound wave generator. Reduce the intensity of noise waves. For the indoor active noise reduction system described in item 2 of the patent application, the waveform data of the noise reduction wave pre-stored in the sound wave database is a plurality of sets of noise reduction wave spectrum characteristic values, and each set of noise reduction wave spectrum characteristic values is used to Represents the spectral distribution characteristics corresponding to a noise reduction wave, which is obtained through actual sampling of different users. The indoor active noise reduction system described in item 1 of the patent application, wherein the sound sensor is integrated in the mouth and nose appliance and has a wireless signal module for sending the sensing signal to the Handle the host. For example, in the indoor active noise reduction system described in item 3 of the patent application, the disturbance sensor includes an airflow sensor that generates the wake-up signal when the local change in the airflow at the user's mouth and nose is greater than the preset value. To wake up the entire system from the power saving state, and to sense local changes in the airflow at the user's mouth and nose, the sensing signal is sent. For example, in the indoor active noise reduction system described in item 1 of the patent application, the disturbance sensor further includes an airflow sensor, and the sound sensor senses that the noise intensity emitted by the user's mouth and nose is greater than the preset threshold. value or the airflow sensing When the device senses local changes in the airflow at the user's mouth and nose, it immediately generates the sensing signal and sends it to the processing host. For example, in the indoor active noise reduction system described in Item 1 of the patent application, the mouth and nose appliance is disposable, and the sound sensor and the activation switch are detachable. For example, in the indoor active noise reduction system described in item 1 of the patent application, the sound sensor, the processing host and the sound wave generator are implemented by corresponding hardware in a smart phone, and the smart phone executes a The application includes the following steps: sensing the noise emitted from the user's mouth and nose; generating and sending the sensing signal when the intensity of the sensed noise is greater than the preset threshold; and responding to the triggering of the sensing signal. The noise reduction wave is generated to reduce the noise emitted from the user's mouth and nose. In the indoor active noise reduction system described in item 1 of the patent application, the disturbance sensor, an independent power supply, a wireless signal module and the activation switch are integrated on an electronic device, and the mouth is completed with a mask. The nasal appliance is provided with a zipper bag to place the electronic device.

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