TW201917765A - Noise cancellation device and noise cancellation method - Google Patents

Abstract

A noise cancellation device includes a voice receiving module, a distance measuring module, an active noise cancellation module and a speaker module. The voice receiving module is used to receive a noise. The distance measuring module is used to send a distance measuring signal to an object, and calculate distance information of the object according to a reflected distance measuring signal reflected by the object. The noise cancellation module is connected to the voice receiving module and the distance measuring module, and is used to generate a reverse phase signal of the noise according to the noise. The speaker module is connected to the noise cancellation module, and is used to generate an anti-noise according the reverse phase signal, and sounds the anti-noise according to the distance information.

Description

Noise canceling device and noise canceling method

The present disclosure relates to a noise canceling device and a noise canceling method, and more particularly to a noise canceling device and a noise canceling method having an active noise canceling function.

In general, when a user uses a notebook computer in a noisy environment, it is inevitable that it will be disturbed by noise and cause distraction. The usual improvement method is that the user wears earplugs or earphones to block noise. However, wearing earplugs or earphones for a long time will cause discomfort to the user's ear, which may cause another problem.

Embodiments of the present disclosure disclose a noise canceling device and a noise canceling method.

A noise canceling device of the present disclosure includes a sound receiving module, a distance measuring module, a noise canceling module, and a speaker module. The radio module is used to receive noise. The ranging module is configured to send a ranging signal to the object, and calculate the distance information of the object according to the ranging signal reflected by the object. The noise cancellation module is connected to the sound collection module and the distance measuring module for generating an inverted signal of noise according to noise. The speaker module is connected to the noise cancellation module to generate anti-noise based on the inverted signal and to provide noise immunity based on the distance information.

A noise canceling method of the present disclosure is applied to a noise canceling apparatus, and the noise canceling method includes receiving noise by a sound receiving module. The ranging module sends a ranging signal to the object, and calculates the distance information of the object according to the ranging signal reflected by the object. An anti-reflection signal that generates noise based on noise by the noise cancellation module. The speaker module generates anti-noise based on the inverted signal and emits anti-noise based on the distance information.

In summary, the noise canceling device and the noise canceling method of the present disclosure form a noise reduction area at the user's ear position by the sound receiving module, the distance measuring module, the noise canceling module, and the speaker module, and The noise zone will move as the user moves, whereby when the user uses the noise canceling device in a noisy environment, since the noise from the external environment has been offset by the noise generated by the speaker module, the user It will not be distracted by this noise, and this anti-noise mechanism will not cause discomfort to the user.

The embodiments are described in detail below to better understand the aspects of the present invention, but the embodiments are not intended to limit the scope of the present disclosure, and the description of structural operations is not intended to limit the scope thereof. The order of execution, any structure that is recombined by components, produces equal devices, and is covered by this case.

As used herein, "including", "having", etc., are all terms that are open, meaning to include but not limited to.

The terms used herein have the usual meaning of each term used in the art, the content disclosed herein, and the particular content, unless otherwise specified. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of the disclosure.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic diagram of a noise canceling apparatus 100 and an object OB according to an embodiment of the present disclosure, and FIG. 2 is a diagram according to an embodiment of the present disclosure. A functional block diagram of the noise canceling device 100 and the object OB.

The noise cancellation device 100 includes a sound collection module 110, a distance measurement module 130, a noise cancellation module 150, and a speaker module 170.

The noise cancellation module 150 is connected to the sound collection module 110, the distance measurement module 130, and the speaker module 170.

In an embodiment, the noise canceling device 100 is exemplified by a notebook computer. However, it is not limited thereto. Any device that functions like a notebook computer belongs to the protection scope of the present invention, such as an integrated computer (All- In One PC, AIO) or smart phones.

In one embodiment, the sound module 110 is exemplified by a microphone, the distance measuring module 130 is an infrared range finder, and the noise canceling module 150 is an active noise canceling (ANC) chip. For example, the speaker module 170 is exemplified by a speaker, and is not limited thereto.

In one embodiment, the object OB is exemplified by a human ear.

Referring again to FIGS. 1 through 3, FIG. 3 is a flow chart of a noise canceling method 200 in accordance with an embodiment of the present disclosure. The noise canceling method 200 of Fig. 3 can be implemented by applying the noise canceling device 100 of Figs. 1 and 2 .

In step S110, the sound collection module 110 can receive the noise NS generated from the external environment, such as the sound of the chat or the sound of the object collision.

In step S130, the ranging module 130 can send the ranging signal DS to the object OB, and calculate the distance information DI of the object OB according to the ranging signal RDS reflected by the object OB.

In an embodiment, the ranging signal DS is exemplified by infrared rays.

Further, for a detailed description of the distance information DI, please refer to FIG. 4, which is a schematic diagram of the distance information DI according to an embodiment of the present disclosure.

First, the configuration of the radio module 110, the ranging module 130, the speaker module 170, and the object OB is as shown in FIG. 4, and the configuration is only an example, and is not limited thereto.

Then, the distance between the sound receiving module 110, the distance measuring module 130, the speaker module 170, and the object OB, that is, the first distance D1, the second distance D2, the third distance D3, and the fourth distance D4, are further defined. The fifth distance D5. The first distance D1 is the distance between the object OB and the ranging module 130. The second distance D2 is the distance between the object OB and the sound collection module 110. The third distance D3 is the distance between the object OB and the speaker module 170. The fourth distance D4 is the distance between the distance measuring module 130 and the sound receiving module 110, and is a known value. The fifth distance D5 is the distance between the distance measuring module 130 and the speaker module 170, and is a known value.

The distance information DI includes a first distance D1, a second distance D2, and a third distance D3.

The first distance D1 can be calculated by the ranging module 130. Specifically, the ranging module 130 sends the ranging signal DS to the object OB, and calculates the first distance D1 according to the ranging signal RDS reflected by the object OB. In detail, the ranging module 130 includes a timer (not shown) for determining the time from the transmission to the reception of the ranging signal DS, and calculating the first distance D1.

The second distance D2 can be calculated by the ranging module 130 according to the first distance D1 and the fourth distance D4. In detail, the sound module 110, the distance measuring module 130 and the object OB form a triangle, and the first distance D1, the second distance D2 and the fourth distance D4 are respectively the lengths of the three sides of the triangle.

After the length of the two sides of the triangle, that is, the first distance D1 and the fourth distance D4, and the first angle α of the two sides are calculated, the remainder of the triangle can be calculated according to the cosine theorem in the trigonometric function. The length of one side, that is, the second distance D2. That is to say, the first distance D1, the second distance D2, the fourth distance D4 and the first angle α can satisfy the following formula: .

The third distance D3 can be calculated by the ranging module 130 according to the first distance D1 and the fourth distance D4. In detail, the ranging module 130, the speaker module 170, and the object OB form a triangle, and the first distance D1, the third distance D3, and the fifth distance D5 are respectively the lengths of the three sides of the triangle.

After the length of the two sides of the triangle, that is, the first distance D1 and the fifth distance D5, and the second angle β of the two sides are calculated, the remaining of the triangle can be calculated according to the cosine theorem in the trigonometric function. The length of one side, that is, the third distance D3. That is, the first distance D1, the third distance D3, the fifth distance D5, and the second angle β satisfy the following formula: .

In step S150, the noise cancellation module 150 can generate the inverted signal RS of the noise NS according to the noise NS.

Specifically, when the sound receiving module 110 receives the noise NS, the noise canceling module 150 can analyze the noise NS and take out the phase, frequency, and amplitude of the noise NS.

In step S170, the speaker module 170 can generate anti-noise ANS according to the inverted signal RS, and emit anti-noise ANS according to the distance information DI.

Since the second distance D2 and the speed of sound are known, the noise cancellation module 150 can calculate the first time T1 at which the object OB receives the noise NS.

The noise cancellation module 150 calculates the inverse signal RS when the noise NS is generated according to the known third distance D3, the sound speed and the first time T1. The frequency and amplitude of the inverted signal RS are the same as the noise NS, and the inversion is performed. The phase of the signal RS is 180 degrees out of phase with the noise NS. In other words, the noise cancellation module 150 can calculate the second time T2 for generating the inverted signal RS according to the third distance D3 and the first time T1, the first time T1, the second time T2, the second distance D2, and the third time. The distance D3 can satisfy the following formula: .

Specifically, when the noise cancellation module 150 generates the inversion signal RS at the second time T2, the speaker module 170 can generate anti-noise ANS, wherein the anti-noise ANS has the same frequency and amplitude as the noise NS, and is anti-noise. The phase of the ANS is 180 degrees out of phase with the noise NS.

Therefore, for the object OB, the object OB will receive the noise NS and the anti-noise ANS. Since the noise NS and the anti-noise ANS have the same frequency and amplitude, and the phases are 180 degrees out of phase, the sound wave and the anti-noise of the noise NS The sound waves of the noise ANS will destructively interfere with each other, and the noise reduction zone will be formed at the position of the object OB, and the noise reduction zone will move as the object OB moves.

An example of the first time T1 and the second time T2 will be further explained below.

First, it is assumed that the arrangement of the sound collection module 110, the distance measuring module 130, the speaker module 170, and the object OB is as shown in FIG. 4, and the second distance D2 is twice the third distance D3.

After the sound receiving module 110 receives the noise NS, the noise canceling module 150 can calculate the first time T1 at which the object OB receives the noise NS according to the second distance D2, for example, two seconds.

Next, in order to make the position of the object OB form a noise reduction zone, the object OB must receive both the noise NS and the anti-noise ANS. It is known that the first time T1 at which the object OB receives the noise NS is two seconds. According to the assumption that the second distance D2 is twice the third distance D3, since the sound speeds of the noise NS and the anti-noise ANS are the same, it can be further pushed. When the second time T2 of the anti-noise ANS generated by the speaker module 170 is one second, the object OB can simultaneously receive the noise NS and the anti-noise ANS, so that the position of the object OB forms a noise reduction zone to achieve noise. The purpose of NS elimination. It should be noted that the values of the first time T1 and the second time T2 described above are merely illustrative and not actual values.

In summary, the noise canceling device and the noise canceling method of the present disclosure form a noise reduction area at the user's ear position by the sound receiving module, the distance measuring module, the noise canceling module, and the speaker module, and The noise zone will move as the user moves, whereby when the user uses the noise canceling device in a noisy environment, since the noise from the external environment has been offset by the noise generated by the speaker module, the user It will not be distracted by this noise, and this anti-noise mechanism will not cause discomfort to the user.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone having ordinary knowledge in the technical field can protect the case without any deviation and refinement within the spirit and scope of the present case. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Noise elimination device

110‧‧‧ Radio Module

130‧‧‧Ranging module

150‧‧‧Noise elimination module

170‧‧‧ Speaker Module

200‧‧‧ Noise elimination method

S110~S170‧‧‧Steps

ANS‧‧‧anti-noise

DI‧‧‧ distance information

DS‧‧‧Ranging signal

D1‧‧‧First distance

D2‧‧‧Second distance

D3‧‧‧ third distance

D4‧‧‧ fourth distance

D5‧‧‧ fifth distance

NS‧‧‧ noise

RDS‧‧‧Ranging signal reflected by object

RS‧‧·reverse signal

OB‧‧‧ objects

Α‧‧‧first angle

Β‧‧‧second angle

The above and other objects, features, advantages and embodiments of the present disclosure will become more apparent and understood. A schematic representation of the object. 2 is a functional block diagram of a noise canceling device and an object according to an embodiment of the present disclosure. Figure 3 is a flow diagram of a noise cancellation method in accordance with one embodiment of the present disclosure. Figure 4 is a schematic illustration of distance information shown in accordance with one embodiment of the present disclosure.

Claims (10)

A noise canceling device includes: a sound receiving module for receiving a noise; a distance measuring module for emitting a ranging signal to an object, and calculating the object according to the distance measuring signal reflected by the object a noise-removing module, connected to the sound-receiving module and the distance-measuring module, and configured to generate an inverted signal of the noise according to the noise; and a speaker module, and the noise cancellation The module is connected to generate an anti-noise according to the inverted signal, and the anti-noise is generated according to the distance information. The noise canceling device of claim 1, wherein the distance information comprises a first distance, a second distance, and a third distance, wherein the first distance, the second distance, and the third distance are respectively The distance measuring module, the object and the sound module, and a distance between the object and the speaker module, the noise canceling module calculates, according to the second distance and a sound speed, the object receives the noise The first time, the noise cancellation module calculates a second time for generating the inverted signal according to the third distance and the first time. The noise canceling device of claim 2, wherein the first time, the second time, the second distance, the third distance, and the following formula are satisfied: Where T1 is the first time, T2 is the second time, D2 is the second distance, and D3 is the third distance. The noise canceling device of claim 2, wherein the distance measuring module is configured to calculate the second distance according to the first distance, a fourth distance, and a first angle, and the ranging module is used according to the first Calculating the third distance by a distance, a fifth distance and a second angle, wherein the four distances and the fifth distance are respectively the distance measuring module, the sound receiving module, the distance measuring module and the sounding mode a distance between the groups, the first angle is an angle between one side of the distance measuring module and the object and one side connected to the distance measuring module and the sound module, the second angle is connected to The distance measuring module and the side of the object are at an angle to one of the sides of the ranging module and the speaker module. The noise canceling device of claim 4, wherein the first distance, the second distance, the third distance, the fourth distance, the fifth distance, the first angle, and the second angle satisfy the following formula: , Where D1 is the first distance, D2 is the second distance, D3 is the third distance, D4 is the fourth distance, D5 is the fifth distance, α is the first angle, and β is the second angle . A noise canceling method is applied to a noise canceling device, wherein the noise canceling method comprises: receiving a noise by a sound receiving module; sending a ranging signal to an object by a ranging module, and according to the object The reflected distance signal is used to calculate a distance information of the object; a noise cancellation module generates an inverted signal of the noise according to the noise; and a speaker module generates a reverse signal according to the inverted signal Anti-noise and based on the distance information to emit the anti-noise. The noise cancellation method of claim 6, wherein the distance information comprises a first distance, a second distance, and a third distance, wherein the first distance, the second distance, and the third distance are respectively the object and The distance measuring module, the object and the sound module, and a distance between the object and the speaker module, the noise canceling module calculates, according to the second distance and a sound speed, the object receives the noise The first time, the noise cancellation module calculates a second time for generating the inverted signal according to the third distance and the first time. The noise cancellation method of claim 7, wherein the first time, the second time, the second distance, the third distance, and the following formula are satisfied: Where T1 is the first time, T2 is the second time, D2 is the second distance, and D3 is the third distance. The method of claim 7, wherein the ranging module is configured to calculate the second distance according to the first distance, a fourth distance, and a first angle, and the ranging module is configured to Calculating the third distance by using a first distance, a fifth distance, and a second angle, wherein the four distances and the fifth distance are respectively between the distance measuring module and the sound receiving module and the speaker module The first angle is an angle between one side of the distance measuring module and the object and one side of the distance measuring module and the sound receiving module, and the second angle is connected to the distance measuring module. The side of the object is at an angle to one of the sides of the ranging module and the speaker module. The noise cancellation method of claim 9, wherein the first distance, the second distance, the third distance, the fourth distance, the fifth distance, the first angle, and the second angle satisfy the following formula: , Where D1 is the first distance, D2 is the second distance, D3 is the third distance, D4 is the fourth distance, D5 is the fifth distance, α is the first angle, and β is the second angle .