A noise reduction type environmentally friendly bluetooth headset and noise reduction method thereof

Abstract

The present invention relates to a noise reduction type environmentally friendly Bluetooth headset and a noise reduction method thereof, the noise reduction type environmentally friendly Bluetooth headset comprises a main body shell, an ear hook, an earphone cover plate and an earplug, the earplug has a sponge ring, a silicone ring is embedded in the sponge ring, and the silicone ring is sleeved on the outside of a speaker housing, characterized in that a control panel, a power supply device, a data storage device, a Bluetooth communication device and a Beidou positioning device are arranged on the inner side of the main body shell, an earphone switch button, a volume increase button, a volume decrease button and a positioning button are arranged on the side of the main body shell, a display screen is arranged on one side wall of the main body shell, a noise reduction device and an audio collection device are arranged in the cavity of the earphone cover plate, a speaker is arranged on the inner side of the speaker housing, the noise reduction device, the audio collection device and the speaker are respectively connected to the control panel, and the main body shell, the earphone cover plate and the speaker housing are all made of degradable materials. The Bluetooth headset can not only effectively reduce noise, but also has rich functions and meets the requirements for environmental protection.

Description

Technical Field

[0001] The present invention relates to the field of earphones, and in particular to a noise reduction type environmentally friendly Bluetooth earphone and a noise reduction method thereof. Background Art

[0002] As a must-have accessory for mobile phone users, Bluetooth headsets are becoming more and more popular, especially among sports enthusiasts, who can listen to music while participating in outdoor sports.

[0003] After people put the existing Bluetooth headset on their ears, they can start the switch of the Bluetooth headset and the Bluetooth function to enable Bluetooth communication between the Bluetooth headset and the mobile phone device, and then enjoy music and communicate by voice.

[0004] Existing Bluetooth headsets also have problems in use: the sound insulation effect of existing Bluetooth headsets is poor, and they cannot effectively reduce external noise, resulting in a lot of noise mixed in the audio heard by users when wearing the headsets, affecting the hearing effect of using Bluetooth headsets. Existing Bluetooth headsets not only have single functions, but also rarely consider the adverse effects of Bluetooth headsets on the environment after being discarded, and fail to incorporate the concept of environmental protection into the design of existing Bluetooth headsets. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a noise reduction environmentally friendly Bluetooth headset based on the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a noise reduction method for a noise reduction type environmentally friendly Bluetooth headset.

[0007] The technical solution adopted by the present invention to solve the first technical problem is: a noise reduction type environmentally friendly Bluetooth headset, comprising:

[0008] Main body shell;

[0009] An ear hook is mounted on the main body shell;

[0010] An earphone cover plate has a cavity, and the earphone cover plate is fixed on the main shell;

[0011] A speaker housing is mounted on one side of the main housing;

[0012] The earplug has a sponge ring, a silicone ring is embedded inside the sponge ring, and the silicone ring is sleeved on the outer side of the speaker housing;

[0013] It is characterized in that a control panel, a power supply device, a data storage device, a Bluetooth communication device and a Beidou positioning device are arranged on the inner side of the main body shell, an earphone switch button, a volume increase button, a volume decrease button and a positioning button are arranged on the side of the main body shell, a display screen is arranged on one side wall of the main body shell, the control panel is respectively connected to the power supply device, the data storage device, the Bluetooth communication device, the Beidou positioning device, the earphone switch button, the volume increase button, the volume decrease button, the positioning button and the display screen, and the power supply device is respectively connected to the Bluetooth communication device, the Beidou positioning device and the display screen; a noise reduction device and an audio collection device for collecting ambient audio signals outside the earphone cover are arranged in the cavity of the earphone cover plate, the noise reduction device is respectively connected to the control panel and the power supply device, and the audio collection device is connected to the control panel; a speaker is arranged on the inner side of the speaker shell, and the speaker is respectively connected to the control panel, the power supply device and the data storage device; wherein the main body shell, the earphone cover plate and the speaker shell are all made of degradable materials.

[0014] As an improvement, in the noise reduction type environmentally friendly Bluetooth headset, the ear hook is an arc-shaped structure made of silicone material, and a spherical protrusion is formed on the ear hook at a position in contact with the human ear.

[0015] Furthermore, in the noise-reducing environmentally friendly Bluetooth headset, an LED light and a temperature sensor are arranged on the outer side of the headset cover, the LED is respectively connected to the control board and the power supply device, and the temperature sensor is connected to the control board and the display screen.

[0016] As an improvement, in the noise reduction type environmentally friendly Bluetooth headset, an annular silicone sheet made of silicone material is provided on one side of the main body shell and fixed to the headset cover.

[0017] As a further improvement, in the noise-canceling environmentally friendly Bluetooth headset, a USB data port and an acceleration sensor are provided on a side wall of the main shell, the USB data port is respectively connected to the control board, the data storage device and the power supply device, and the acceleration sensor is connected to the control board.

[0018] Preferably, in the noise-canceling environmentally friendly Bluetooth headset, the power supply device is a rechargeable battery.

[0019] Improved, in the noise reduction type environmentally friendly Bluetooth headset, the outer side walls of the main body shell, the ear hook and the headset cover are all coated with fluorescent material.

[0020] As a further improvement, in the noise-reducing environmentally friendly Bluetooth headset, the main body shell, the headset cover and the speaker shell are all made of polylactic acid.

[0021] The technical solution adopted by the present invention to solve the second technical problem is: a noise reduction method for the noise reduction type environmentally friendly Bluetooth headset, characterized by comprising the following steps 1 to 7:

[0022] Step 1, using an audio collection device to collect ambient audio signals outside the headphone cover within a preset time period to obtain an ambient audio signal sequence;

[0023] Step 2: The control board processes the obtained environmental audio signal sequence to obtain an external sound sequence subsequence and an external noise signal subsequence;

[0024] Step 3, the control board calculates and obtains a set of characteristic parameters of the external noise signal according to the obtained external noise signal subsequence;

[0025] Step 4, the acceleration sensor collects acceleration data of the current noise reduction type environmentally friendly Bluetooth headset within the preset time period to obtain an acceleration data sequence;

[0026] Step 5: the control board processes the external noise signal characteristic parameter set and the acceleration data sequence to obtain a noise reduction signal characteristic parameter set for canceling the current external noise signal; wherein the noise reduction signal characteristic parameter set includes an amplitude characteristic parameter and a phase characteristic parameter for canceling the current external noise signal, and the phase characteristic parameter is consistent with the phase of the current external noise signal;

[0027] Step 6, the control board sends the noise reduction signal characteristic parameter set to the noise reduction device;

[0028] Step 7: The noise reduction device forms a noise reduction signal according to the received noise reduction signal characteristic parameter set, and sends the noise reduction signal to the speaker.

[0029] Furthermore, in the noise reduction method of the noise reduction type environmentally friendly Bluetooth headset, in step 5, the control board processes the external noise signal characteristic parameter set and the acceleration data sequence in the following steps S1 to S6 to obtain a noise reduction signal characteristic parameter set that cancels the current external noise signal:

[0030] Step S1, the control board determines the motion state of the wearer of the noise reduction type environmentally friendly Bluetooth headset according to the acceleration data sequence:

[0031] When it is determined that the wearer is in motion, the control panel commands the audio collection device to collect the current ambient audio signal outside the current headphone cover again, and proceeds to step S2; otherwise, no processing is performed;

[0032] Step S2, the control board obtains the amplitude value of the current ambient audio signal according to the current ambient audio signal, and then proceeds to step S3;

[0033] Step S3, the control board obtains the average amplitude value of the external sound signal corresponding to the external sound sequence number subsequence according to the external sound sequence number subsequence, and then proceeds to step S4;

[0034] Step S4, the control board makes a judgment based on the amplitude value of the current ambient audio signal and the average amplitude value of the external sound signal:

[0035] When the amplitude value of the obtained current environment audio signal is greater than the average amplitude value of the obtained external sound signal, the process proceeds to step S5; otherwise, the process proceeds to step S6;

[0036] Step S5, the control board uses the amplitude value of the current ambient audio signal as an amplitude value characteristic parameter to offset the current external noise signal, and uses the amplitude value characteristic parameter as a noise reduction signal characteristic parameter of the noise reduction signal characteristic parameter set, and then proceeds to step 6;

[0037] In step S6, the control board uses the average amplitude value of the external sound signal as an amplitude characteristic parameter to offset the current external noise signal, and uses the amplitude characteristic parameter as a noise reduction signal characteristic parameter of the noise reduction signal characteristic parameter set, and then proceeds to step 6.

[0038] Compared with the prior art, the advantages of the present invention are:

[0039] Firstly, by setting a noise reduction device inside the headphone cover of the Bluetooth headset and an audio collection device outside the headphone cover, and setting a control board connected to and controlling the noise reduction device inside the main body shell of the Bluetooth headset, the noise reduction device can start the noise reduction work according to the instructions of the control board, and generate a noise reduction signal (an anti-phase sound wave equal to the external environmental noise) that can offset the external environmental noise, thereby reducing the environmental noise entering the speaker in an active noise reduction manner, improving the normal audio playback effect and clarity of the speaker, and meeting people's needs of using Bluetooth headsets to enjoy pure music or realize voice communication.

[0040] Secondly, by adding a data storage device, a Beidou positioning device, a display screen and a USB data port to the Bluetooth headset of the invention, not only can the functions of the Bluetooth headset be enriched, but also the user's outdoor positioning needs and the requirement of importing audio data into the Bluetooth headset according to actual needs can be met.

[0041] In addition, since the main body shell, earphone cover and speaker shell of the Bluetooth headset of the invention are all made of degradable materials, the damage to the environment caused by discarded Bluetooth headsets can be reduced to a great extent, meeting the requirements of environmental protection.

[0042] Finally, the Bluetooth headset of this invention also adopts a special noise reduction processing method as needed. By utilizing the ambient audio signal collected from the external environment and the acceleration data collected by the acceleration sensor, it realizes the adjustment of the noise reduction signal characteristic parameters of the noise reduction signal, thereby more effectively reducing the noise signal and improving the audio quality and audio clarity of the Bluetooth headset when playing normal audio or voice calls, meeting the user's demand for high-quality audio of Bluetooth headsets. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of the noise reduction environmentally friendly Bluetooth headset in this embodiment;

[0044] Figure 2 for Figure 1 The connection diagram of the main components of the noise-canceling environmentally friendly Bluetooth headset shown;

[0045] Figure 3 Schematic diagram of the noise reduction method of the noise reduction type environmentally friendly Bluetooth headset in this embodiment. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the accompanying drawings.

[0047] like Figure 1 and Figure 2 As shown, the noise reduction environmentally friendly Bluetooth headset in this embodiment includes:

[0048] Main body shell 1;

[0049] The ear hook 2 is detachably mounted on the main housing 1. The ear hook 2 is an arc-shaped structure made of silicone material. A spherical protrusion 20 is formed on the ear hook 2 at a position in contact with the human ear.

[0050] The earphone cover plate 3 has a cavity, and the earphone cover plate 3 is fixed on the main housing 1;

[0051] A speaker housing 4 is mounted on one side of the main housing 1;

[0052] The earplug 5 has a sponge ring 51, a silicone ring 52 is embedded inside the sponge ring 51, and the silicone ring 52 is sleeved on the outer side of the speaker housing 4; wherein:

[0053] A control panel 601, a power supply device 602, a data storage device 603, a Bluetooth communication device 604 and a Beidou positioning device 605 are arranged on the inner side of the main body shell 1. The power supply device 602 adopts a rechargeable battery. An earphone switch button 606, a volume increase button 607, a volume decrease button 608 and a positioning button 609 are arranged on the side of the main body shell 1. The earphone switch button 606, the volume increase button 607, the volume decrease button 608 and the positioning button 609 are all covered with a silicone sleeve. A display screen 610 is arranged on a side wall of the main body shell 1. The control panel 601 is connected to the power supply device 602, and the Bluetooth communication device 604 and the Beidou positioning device 605 are connected to the power supply device 602. , a data storage device 603, a Bluetooth communication device 604, a Beidou positioning device 605, an earphone switch button 606, a volume increase button 607, a volume decrease button 608, a positioning button 609 and a display screen 610, and a power supply device 602 is respectively connected to the Bluetooth communication device 604, the Beidou positioning device 605 and the display screen 610; and a USB data port 616 and an acceleration sensor 617 are also provided on a side wall of the main body shell 1, and the USB data port 616 is respectively connected to the control board 601, the data storage device 603 and the power supply device 602, and the acceleration sensor 617 is connected to the control board 601;

[0054] A noise reduction device 611 and an audio collection device 612 for collecting ambient audio signals on the outside of the earphone cover plate are arranged in the cavity of the earphone cover plate 3, the noise reduction device 611 is respectively connected to the control board 601 and the power supply device 602, and the audio collection device 612 is connected to the control board 601; an LED light 614 and a temperature sensor 615 are arranged on the outside of the earphone cover plate 3, the LED light 614 is respectively connected to the control board 601 and the power supply device 602, and the temperature sensor 615 is connected to the control board 601 and the display screen 610;

[0055] A speaker 613 is arranged on the inner side of the speaker housing 4, and the speaker 613 is respectively connected to the control board 601, the power supply device 602 and the data storage device 603; the main body shell 1, the earphone cover 3 and the speaker housing 4 are all made of degradable materials, and the outer side walls of the main body shell 1, the ear hook 2 and the earphone cover 3 are coated with fluorescent materials.

[0056] For example, in this embodiment, the main body shell 1, the earphone cover plate 3 and the speaker housing 4 are all made of degradable materials such as polylactic acid. In this way, even if the Bluetooth headset of this embodiment is discarded, since the main body shell 1, the earphone cover plate 3 and the speaker housing 4 are all made of degradable materials, the damage to the environment caused by the discarded Bluetooth headset can be reduced to a great extent, meeting the requirements of environmental protection.

[0057] In order to further enhance the noise reduction effect, in the noise reduction type environmentally friendly Bluetooth headset of this embodiment, an annular silicone sheet 10 made of silicone material is also provided on one side of the main body shell 1 and fixed to the headset cover 3. When the user wears the Bluetooth headset of this embodiment, the annular silicone sheet 10 can be closely attached to the user's ear, thereby utilizing the close contact between the annular silicone sheet and the ear to reduce the external noise from entering the headset, thereby further enhancing the noise reduction effect.

[0058] In the noise reduction type environmentally friendly Bluetooth headset of this embodiment, after wearing the Bluetooth headset, the user can start the Bluetooth headset and turn it into working state by pressing the headset switch button 606, the Bluetooth communication device 604 starts working and establishes Bluetooth communication with the user's mobile phone terminal, and the control board 601 will command the audio collection device 612 to collect the ambient audio signal outside the headset cover and command the noise reduction device 611 to start the noise reduction processing operation, so that the noise reduction device 611 can generate a noise reduction signal (an anti-phase sound wave equal to the external ambient noise) that can offset the current external noise, and then send the generated noise reduction signal to the speaker 613, so as to achieve effective noise reduction, thereby improving the visual effect of the entire Bluetooth headset;

[0059] The user can press the volume up button 607 or the volume down button 608 as needed to increase or decrease the volume of the played audio (music or call); when the user needs to obtain his current location, he can press the positioning button 609 again, so that the control panel 601 will command the Beidou positioning device 605 to obtain the current location, and display the current location information on the display screen 610 of the Bluetooth headset as needed; the user can also observe the current location temperature obtained by the temperature sensor 615 through the display screen 610, thereby enriching the function of the Bluetooth headset through the position display function and the temperature display function. In addition, the user can not only import audio data into the data storage device 603 with the help of the USB data port 616 of the headset, but also play the imported related data through the speaker 613 or display the imported related data on the display screen 610. In addition, since the LED light 614 is set on the outside of the headset cover plate 3, it can be convenient to emit light in the night environment, thereby reminding pedestrians and vehicles passing by. Of course, the fluorescent material coated on the outer walls of the main shell 1, the ear hook 2 and the earphone cover 3 can further enhance the luminous prompt effect of the entire Bluetooth headset, which has a good prompt effect and is also convenient for users to find the accidentally lost Bluetooth headset in a dimly lit environment.

[0060] The spherical protrusion 20 provided on the ear hook 2 can increase the friction between the ear hook and the human ear, thereby preventing the ear hook from sliding on the human ear.

[0061] Also, see Figure 3As shown, this embodiment also provides a noise reduction method for the noise reduction type environmentally friendly Bluetooth headset. Specifically, the noise reduction method for the noise reduction type environmentally friendly Bluetooth headset includes the following steps 1 to 7:

[0062] Step 1, using the audio collection device 612 to collect ambient audio signals outside the earphone cover within a preset time period to obtain an ambient audio signal sequence;

[0063] Step 2: the control board 601 processes the obtained environmental audio signal sequence to obtain an external sound sequence number subsequence and an external noise signal subsequence;

[0064] Step 3, the control board 601 calculates and obtains a set of characteristic parameters of the external noise signal according to the external noise signal subsequence;

[0065] Step 4, the acceleration sensor 617 collects acceleration data of the current noise reduction type environmentally friendly Bluetooth headset within the preset time period to obtain an acceleration data sequence;

[0066] Step 5: the control board 601 processes the characteristic parameter set of the external noise signal and the acceleration data sequence to obtain a characteristic parameter set of the noise reduction signal for canceling the current external noise signal; wherein the characteristic parameter set of the noise reduction signal includes an amplitude characteristic parameter and a phase characteristic parameter for canceling the current external noise signal, and the phase characteristic parameter is consistent with the phase of the current external noise signal;

[0067] Step 6, the control board 601 sends the noise reduction signal characteristic parameter set to the noise reduction device 612;

[0068] Step 7: The noise reduction device 612 forms a noise reduction signal according to the received noise reduction signal characteristic parameter set, and sends the noise reduction signal to the speaker 613 to cancel the noise signal at the speaker 613.

[0069] Of course, specifically in step 5 of this embodiment, the control board 601 processes the external noise signal characteristic parameter set and the acceleration data sequence in the following steps S1 to S6 to obtain a noise reduction signal characteristic parameter set that cancels the current external noise signal:

[0070] Step S1, the control board 601 determines the motion state of the wearer of the noise reduction type environmentally friendly Bluetooth headset according to the acceleration data sequence:

[0071] When it is determined that the wearer is in motion, the control board 601 instructs the audio collection device 612 to collect the current ambient audio signal outside the current earphone cover again, and proceeds to step S2; otherwise, no processing is performed;

[0072] Step S2, the control board 601 obtains the amplitude value of the current ambient audio signal according to the current ambient audio signal, and then proceeds to step S3;

[0073] Step S3, the control board 601 obtains the average amplitude value of the external sound signal corresponding to the external sound sequence number subsequence according to the external sound sequence number subsequence, and then proceeds to step S4;

[0074] Step S4, the control board 601 makes a judgment based on the amplitude value of the current ambient audio signal and the average amplitude value of the external sound signal:

[0075] When the amplitude value of the obtained current environment audio signal is greater than the average amplitude value of the obtained external sound signal, the process proceeds to step S5; otherwise, the process proceeds to step S6;

[0076] Step S5, the control board 601 uses the amplitude value of the current ambient audio signal as an amplitude value characteristic parameter to offset the current external noise signal, and uses the amplitude value characteristic parameter as a noise reduction signal characteristic parameter of the noise reduction signal characteristic parameter set, and then proceeds to step 6;

[0077] In step S6, the control board 601 uses the average amplitude value of the obtained external sound signal as an amplitude value characteristic parameter to offset the current external noise signal, and uses the amplitude value characteristic parameter as a noise reduction signal characteristic parameter in the noise reduction signal characteristic parameter set, and then proceeds to step 6.

[0078] Although the preferred embodiments of the present invention are described in detail above, it should be clearly understood that various modifications and variations are possible for those skilled in the art. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A noise reduction method for a noise reduction type environmentally friendly Bluetooth headset, the noise reduction type environmentally friendly Bluetooth headset comprising: Main body shell (1); An ear hook (2) mounted on the main housing (1); An earphone cover plate (3) having a cavity, and the earphone cover plate (3) is fixed on the main housing (1); A speaker housing (4) is mounted on one side of the main housing (1); The earplug (5) comprises a sponge ring (51), a silicone ring (52) is embedded in the interior of the sponge ring (51), and the silicone ring (52) is sleeved on the outer side of the speaker housing (4); A control panel (601), a power supply device (602), a data storage device (603), a Bluetooth communication device (604) and a Beidou positioning device (605) are arranged on the inner side of the main body shell (1); an earphone switch button (606), a volume increase button (607), a volume decrease button (608) and a positioning button (609) are arranged on the side of the main body shell (1); a display screen (610) is arranged on one side wall of the main body shell (1); the control panel (601) is respectively connected to the power supply device (602), the data storage device (603), the Bluetooth communication device (604), the Beidou positioning device (605), the earphone switch button (606), the volume increase button (607), the volume decrease button (608), the positioning button (609) and the display screen (610); the power supply device (602) is respectively connected to the Bluetooth communication device (604), the Beidou positioning device (605) and the display screen (610); an earphone cover plate A noise reduction device (611) and an audio collection device (612) for collecting ambient audio signals on the outside of the earphone cover are arranged in the cavity of the earphone cover, the noise reduction device (611) is respectively connected to the control board (601) and the power supply device (602), and the audio collection device (612) is connected to the control board (601); a speaker (613) is arranged on the inner side of the speaker housing (4), and the speaker (613) is respectively connected to the control board (601), the power supply device (602) and the data storage device (603); wherein the main body housing (1), the earphone cover (3) and the speaker housing (4) are all made of degradable materials; a USB data port (616) and an acceleration sensor (617) are arranged on a side wall of the main body housing (1), the USB data port (616) is respectively connected to the control board (601), the data storage device (603) and the power supply device (602), and the acceleration sensor (617) is connected to the control board (601); It is characterized by comprising the following steps 1 to 7: Step 1, using an audio collection device to collect ambient audio signals outside the headphone cover within a preset time period to obtain an ambient audio signal sequence; Step 2: The control board processes the obtained environmental audio signal sequence to obtain an external sound sequence subsequence and an external noise signal subsequence; Step 3, the control board calculates and obtains a set of characteristic parameters of the external noise signal according to the obtained external noise signal subsequence; Step 4, the acceleration sensor collects acceleration data of the current noise reduction type environmentally friendly Bluetooth headset within the preset time period to obtain an acceleration data sequence; Step 5: the control board processes the external noise signal characteristic parameter set and the acceleration data sequence to obtain a noise reduction signal characteristic parameter set for canceling the current external noise signal; wherein the noise reduction signal characteristic parameter set includes an amplitude characteristic parameter and a phase characteristic parameter for canceling the current external noise signal, and the phase characteristic parameter is consistent with the phase of the current external noise signal; Step 6, the control board sends the noise reduction signal characteristic parameter set to the noise reduction device; Step 7: The noise reduction device forms a noise reduction signal according to the received noise reduction signal characteristic parameter set, and sends the noise reduction signal to the speaker; Among them, in step 5, the control board processes the external noise signal characteristic parameter set and the acceleration data sequence in the following steps S1 to S6 to obtain a noise reduction signal characteristic parameter set that cancels the current external noise signal: Step S1, the control board determines the motion state of the wearer of the noise reduction type environmentally friendly Bluetooth headset according to the acceleration data sequence: When it is determined that the wearer is in motion, the control panel commands the audio collection device to collect the current ambient audio signal outside the current headphone cover again, and the process goes to step S2; otherwise, no processing is performed; Step S2, the control board obtains the amplitude value of the current ambient audio signal according to the current ambient audio signal, and then proceeds to step S3; Step S3, the control board obtains the average amplitude value of the external sound signal corresponding to the external sound sequence number subsequence according to the external sound sequence number subsequence, and then proceeds to step S4; Step S4, the control board makes a judgment based on the amplitude value of the current ambient audio signal and the average amplitude value of the external sound signal: When the amplitude value of the obtained current environment audio signal is greater than the average amplitude value of the obtained external sound signal, the process proceeds to step S5; otherwise, the process proceeds to step S6; Step S5, the control board uses the amplitude value of the current ambient audio signal as an amplitude value characteristic parameter to offset the current external noise signal, and uses the amplitude value characteristic parameter as a noise reduction signal characteristic parameter of the noise reduction signal characteristic parameter set, and then proceeds to step 6; In step S6, the control board uses the average amplitude value of the obtained external sound signal as an amplitude value characteristic parameter to offset the current external noise signal, and uses the amplitude value characteristic parameter as a noise reduction signal characteristic parameter of the noise reduction signal characteristic parameter set, and then proceeds to step 6.

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