KR102017261B1 - Improvement system for audio sound quality of automobile by noise pattern analysis and improvement method therefor - Google Patents

Abstract

According to an aspect of the present invention, there is provided a system for improving sound quality of an in-vehicle audio system, comprising: an analyzer configured to analyze an input noise signal and generate a gain coefficient of audio for each frequency band; And a sound quality improving unit for improving the sound quality of the audio input in real time by using the gain factor, wherein the sound quality improving unit adjusts the gain of the audio amplifier using the gain factor.

Description

Sound quality improvement system of car audio by noise pattern analysis and its improvement method {IMPROVEMENT SYSTEM FOR AUDIO SOUND QUALITY OF AUTOMOBILE BY NOISE PATTERN ANALYSIS AND IMPROVEMENT METHOD THEREFOR}

The present invention relates to a system for improving sound quality of vehicle audio by noise pattern analysis and a method for improving the same. More particularly, the amplification gain of an audio amplifier for each frequency band is analyzed by analyzing a noise pattern according to various situations of a vehicle including driving. The present invention relates to a system for improving sound quality of in-vehicle audio that can be adjusted differently.

Removing noise from a vehicle is not only a reduction of the driver's fatigue caused by the inflow of excessive external noise, but also a recent issue in terms of the rapid increase in the case of controlling various devices by voice recognition in a vehicle.

Generally, noise is removed from a voice recognition system, a headphone, or the like by removing a noise signal input using a noise microphone separately from a voice signal input to the voice recognition microphone.

However, excessive noise may be removed, or unwanted sounds other than noise may be removed, whether or not voice is necessary.

Korean Patent Laid-Open No. 10-2006-0095237: A method for removing noise in a speech recognition system (published August 31, 2006).

Disclosure of Invention The present invention has an object to solve the above technical problem, to provide a system for improving the sound quality of a car audio by noise pattern analysis having a noise canceling characteristic optimized for various environments and a method for improving the same. The purpose is.

According to an aspect of the present invention, there is provided a system for improving sound quality of an in-vehicle audio system, comprising: an analyzer configured to analyze an input noise signal and generate a gain coefficient of audio for each frequency band; And a sound quality improving unit which improves the sound quality of the audio input in real time by using the gain factor.

Specifically, it is preferable that the sound quality improving unit adjusts the gain of the audio amplifier using the gain factor.

In addition, the sound quality improving unit may adjust the gain of the audio amplifier by using the first correction gain coefficient which corrects the gain coefficient by the first correction coefficient using the hearing characteristics of the user for each frequency band.

The system may further include an environment determination unit that determines an environment in which the vehicle is located, wherein the environment determination unit is configured to select one of a plurality of pre-classified environment values. It is characterized by judging the environment in which it is located.

Preferably, the sound quality improving unit may adjust the gain of the audio amplifier by using the second correction gain coefficient which corrects the gain coefficient by the second correction coefficient using the environmental information determined by the environmental determination unit. .

In addition, the sound quality improvement system of the vehicle audio of the present invention, a microphone for receiving a noise signal and an audio signal together; And a noise signal extractor configured to extract a noise signal using the output signal of the microphone and the audio signal being reproduced. The noise signal extracted from the noise signal extractor is input to the analyzer. .

According to an aspect of the present invention, there is provided a method of improving sound quality of a vehicle audio, the method comprising: (a) analyzing an input noise signal to generate a gain coefficient of audio for each frequency band; And (b) improving the sound quality of the audio input in real time by using the gain coefficient.

Specifically, in the step (b), it is preferable to adjust the gain of the audio amplifier using the gain factor.

In addition, in the step (b), the gain of the audio amplifier may be adjusted by correcting the gain coefficient by the first correction coefficient using the hearing characteristics of the user for each frequency band.

In addition, the sound quality improvement method of the vehicle audio according to the present invention may further include (c) determining an environment in which the vehicle is present, wherein step (c) may include selecting one of a plurality of pre-classified environmental values. It is characterized by determining the environment in which the vehicle is located.

Preferably, in the step (b), the gain of the audio amplifier is adjusted by using the second correction gain coefficient which corrects the gain coefficient by the second correction coefficient using the environmental information determined by the step (c). I can adjust it.

According to the system for improving the sound quality of the car audio by the noise pattern analysis and the improvement method of the present invention, it is possible to implement the noise canceling characteristic optimized for the user in various environments.

1 is a block diagram of a system for improving sound quality of vehicle audio by analyzing noise patterns according to an exemplary embodiment of the present invention.
2 is an explanatory diagram of a calculation method of a first correction gain coefficient in which the gain coefficient is corrected by the first correction coefficient;
3 is an explanatory diagram of a calculation method of a second correction gain coefficient obtained by correcting a gain coefficient by a second correction coefficient;
4 is an explanatory diagram for explaining a method for calculating a third correction gain coefficient in which the gain coefficient is corrected by the first correction coefficient and the second correction coefficient;
5 is a flowchart of a method for improving sound quality of vehicle audio by analyzing noise patterns according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the system for improving the sound quality of the car audio by noise pattern analysis according to an embodiment of the present invention.

The following examples of the present invention are intended to embody the present invention, but not to limit or limit the scope of the present invention. From the detailed description and examples of the present invention, those skilled in the art to which the present invention pertains can easily be interpreted as belonging to the scope of the present invention.

First, FIG. 1 shows a configuration diagram of a system 100 for improving sound quality of vehicle audio by analyzing noise patterns according to an exemplary embodiment of the present invention.

As can be seen from Figure 1, the sound quality improvement system 100 for vehicle audio by noise pattern analysis according to an embodiment of the present invention, the microphone 110, noise signal extraction unit 120, analysis unit ( 130, a storage unit 140, an environmental determination unit 150, a sound quality improving unit 160, and an audio amplifier 170.

The sound quality improvement system 100 for vehicle audio of the present invention may use data processing by a digital signal processor (DSP).

The microphone 110 receives a noise signal and an audio signal together. Accordingly, the microphone 110 may be installed inside the vehicle to measure noise according to the environment of the vehicle.

The noise signal extractor 120 extracts a noise signal by using the output signal of the microphone 110 and the audio signal being reproduced. The noise signal extractor 120 may extract a pure noise signal by removing the audio signal using a general echo cancellation technique. For example, the noise signal extractor 120 may extract a pure noise signal by adding a reverse signal of the audio signal being reproduced to the output signal of the microphone 110.

The analyzer 130 analyzes an input noise signal, that is, a noise signal output from the noise signal extractor 120, and generates a gain coefficient of audio for each frequency band. That is, the analysis unit 130 may analyze the magnitude of each frequency band of the noise signal and generate a gain coefficient of the audio using the magnitude.

Since the analysis unit 130 needs to analyze the magnitude of each noise band of the noise signal, it is preferable to detect the magnitude of the noise signal for each frequency band after the conversion using a fast Fourier transformer.

In general, the driving noise of the vehicle has a certain pattern according to the type of vehicle, the speed of the vehicle, and the type and condition of the driving road when the vehicle is driven. The analysis unit 130 analyzes the noise pattern in real time.

The storage unit 140 stores the data generated by the analysis unit 130. That is, the storage 140 stores the gain coefficients for adjusting the frequency band gain of the audio being played in the vehicle audio apparatus in the form of a table in response to the frequency characteristics of the noise analyzed by the analyzer 130. It is preferable.

The sound quality improving unit 160 adjusts the gain of the audio amplifier 170 using the gain coefficient stored in the storage 140. It is preferable to set the gain of the audio amplifier 170 so that the reproduction audio output in the noisy frequency band is set high while balancing the other frequency band by using the gain coefficient stored in the storage 140. That is, the gain coefficient is characterized by setting a large gain in the noisy frequency region to compensate for the noisy frequency region.

Also, the sound quality improving unit 160 may adjust the gain of the audio amplifier 170 by using the first correction gain coefficient obtained by correcting the gain coefficient by the first correction coefficient using the hearing characteristics of the user for each frequency band. .

In addition, the sound quality improving unit 160 uses the second correction gain coefficient obtained by correcting the gain coefficient by the second correction coefficient using the environmental information determined by the environment determination unit 150, and then the gain of the audio amplifier 170. You can also adjust

2 shows an explanatory diagram of a method for calculating a first correction gain coefficient in which the gain coefficient is corrected by the first correction coefficient. Referring to Fig. 2, the method for calculating the first correction gain coefficient according to the present invention will be described.

A person hears not only the frequency band characteristics, such as the range of an audible frequency, but also an audible sound for each individual. In order to correct such individual characteristics, the analysis unit 130 also stores the first correction gain coefficients, in which the gain coefficients are corrected by the first correction coefficients using characteristic data for each frequency band of the user's hearing stored in advance. Need to be saved).

It is preferable that the first correction coefficients are generated by giving signals of various frequency bands to a user of a vehicle such as a driver and receiving the sensitivity characteristics thereof, and are stored in advance in the storage 140.

The first correction gain coefficient may be simply calculated by multiplying the gain coefficient by the frequency band by the first correction coefficient.

3 shows an explanatory diagram of a method of calculating the second correction gain coefficient whose correction is made by the second correction coefficient. 3, a method of calculating the second correction gain coefficient according to the present invention will be described.

The environmental determination unit 150 determines the environment in which the vehicle is located. In detail, the environment determination unit 150 may determine an environment in which the vehicle is located by selecting one of a plurality of pre-classified environment values.

For example, the environment determiner 150 acquires the exterior scenery of the vehicle as image information by a camera, compares the obtained image information with stored various environment image information, and selects the most similar image information. Determine the environment the vehicle is in. The environment in which vehicles are located can be classified into urban roads, complex highways, seaside roads, secluded forest roads, and the like.

The storage unit 140 preferably also stores the second correction gain coefficient obtained by correcting the gain coefficient by the second correction coefficient which is frequency band-specific data using the environmental information determined by the environmental determination unit 150.

For example, when the user does not want to remove the wave sound of the beach road by the noise, when it is determined by the environmental determination unit 150 that the beach road is a noise, the frequency characteristic of the noise corresponding to the sound of the wave is determined by the second correction factor. It needs to be corrected.

The sound quality improving unit 160 may simply calculate the second correction gain coefficient by adding the second correction coefficient to the gain coefficient for each frequency band.

4 shows an explanatory diagram of a method of calculating a third correction gain coefficient obtained by correcting the gain coefficient by the first correction coefficient and the second correction coefficient. 4, a method of calculating the third correction gain coefficient according to the present invention will be described.

When the sound quality improving unit 160 applies the first correction coefficient and the second correction coefficient at the same time, the second correction coefficient is changed in view of the characteristics of the first correction coefficient applied by the multiplication and the second correction coefficient applied by the addition. It is preferable to calculate the third correction gain coefficient by applying the second correction gain coefficient to the gain coefficient first and then applying the first correction coefficient to the second correction gain coefficient.

However, whether the gain coefficient is corrected by the first correction factor and / or the second correction factor may be optional depending on the situation. In addition, in order to amplify the audio amplifier 170, the sound quality improving unit 160 normalizes the finally output gain coefficient, the first correction gain coefficient, the second correction gain coefficient, or the third correction gain coefficient. desirable.

For example, normalization sets the gain coefficient, the first correction gain coefficient, the second correction gain coefficient, or the third correction gain coefficient of the frequency band representing the highest value as '1', and the value of the other band is proportional thereto. Can be adjusted.

The audio amplifier 170 adjusts the gain using the gain adjustment information of the audio amplifier 170 output from the sound quality improving unit 160 and outputs the gain. For example, the audio amplifier 170 may determine the final gain value by multiplying the gain value basically set by the gain adjustment information of the audio amplifier 170 output from the sound quality improving unit 160. In addition, the audio amplifier 170 is connected to the speaker (S).

5 is a flowchart illustrating a method for improving sound quality of vehicle audio by analyzing noise patterns according to an exemplary embodiment of the present invention.

5 is a sound quality improvement method of the vehicle audio of the present invention, the sound quality improvement system 100 of the vehicle audio of the present invention, even if there is no separate description because of using the sound quality improvement system 100 of the present invention of the present invention Of course, it includes all the features.

As can be seen from Figure 5, the sound quality improvement method of the car audio by noise pattern analysis according to an embodiment of the present invention, the step of receiving the noise signal and the audio signal together by the microphone (110) (S10) And extracting a noise signal by using the output signal of the microphone 110 and the audio signal being reproduced (S20).

In addition, the sound quality improvement method of the audio of the vehicle by the noise pattern analysis according to an embodiment of the present invention, by analyzing the input noise signal, generating a gain coefficient of the audio for each frequency band (S30), It is preferable to further include the step of determining the environment (S40) and the step of improving the sound quality of the audio input in real time (S50) using the gain factor.

In operation S40, the environment of the vehicle may be determined by selecting one of a plurality of previously classified environmental values.

In addition, in step S50, it is preferable to adjust the gain of the audio amplifier 170 using the gain factor. In operation S50, the gain of the audio amplifier 170 may be adjusted by correcting the gain coefficient using the first correction coefficient using the hearing characteristics of the user for each frequency band. Preferably, in step S50, the gain of the audio amplifier 170 may be adjusted by using the second correction gain coefficient obtained by correcting the gain coefficient by the second correction coefficient using the environmental information determined by step S40. More preferably, in step S50, the gain of the audio amplifier 170 may be adjusted by correcting the gain coefficient by the first correction coefficient and the second correction coefficient.

As described above, according to the system 100 and the method of improving the sound quality of the car audio by analyzing the noise pattern of the present invention, it can be seen that it is possible to implement the noise canceling characteristics optimized for the user in various environments.

100: car audio quality improvement system
110: microphone
120: noise signal extraction unit
130: analysis unit
140: storage unit
150: environmental judgment
160: sound quality improvement unit
170: audio amplifier

Claims (11)

In the sound quality improvement system of car audio,
An analyzer configured to analyze an input noise signal and generate a gain coefficient of audio for each frequency band; And
A sound quality improving unit which improves the sound quality of the audio input in real time using the gain coefficient; And
An environmental determination unit that obtains the exterior scenery of the vehicle as image information by a camera, compares the obtained image information with stored image information for various environments, and determines the environment in which the vehicle is located by selecting the most similar image information; Including,
The sound quality improvement unit,
Adjust the gain of the audio amplifier using the normalized third corrected gain factor,
The third correction gain coefficient is
The first correction coefficient using the hearing characteristics of the user for each frequency band is calculated by reflecting the second correction gain coefficient,
The second correction gain coefficient is
Calculated by adding the gain coefficient to a second correction coefficient using environmental information determined by the environmental determination unit,
And the third correction gain coefficient of the entire band is normalized using the third correction gain coefficient of the frequency band representing the highest value. delete delete delete delete The method of claim 1,
The sound quality improvement system of the car audio,
A microphone for receiving a noise signal and an audio signal together; And
And a noise signal extractor configured to extract a noise signal by using the output signal of the microphone and the audio signal being reproduced.
And the noise signal extracted by the noise signal extracting unit is input to the analyzing unit. In the sound quality improvement method of car audio,
(S30) analyzing the input noise signal to generate a gain coefficient of the audio for each frequency band;
(S40) determining the environment in which the vehicle is located; And
(S50) after the step S40, by using the gain factor, improving the sound quality of the audio input in real time; including,
The step (S40),
The environment of the vehicle is determined by acquiring the outer landscape of the vehicle as image information by a camera, comparing the obtained image information with stored image information of various environments, and selecting the most similar image information.
The (S50) step,
Adjust the gain of the audio amplifier using the normalized third corrected gain factor,
The third correction gain coefficient is
The first correction coefficient using the hearing characteristics of the user for each frequency band is calculated by reflecting the second correction gain coefficient,
The second correction gain coefficient is
It is calculated by adding the gain coefficient to the second correction coefficient using the environmental information determined in the step (S40),
And the third correction gain coefficient of the entire band is normalized using the third correction gain coefficient of the frequency band showing the highest value. delete delete delete delete

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