KR20080011831A - Apparatus and method for controlling equalizer equiped with audio reproducing apparatus - Google Patents

Abstract

An apparatus and a method for automatically controlling an equalizer of an audio player are provided to output an audio file whose frequency bands are adjusted as an audible audio signal by analyzing a play list of the audio file and ID tag information and adjusting the frequency bands according to user preference information on the equalizer. A method for automatically controlling an equalizer of an audio player includes the steps of analyzing equalizer set pattern of a specific frequency band and generating preference information, and adjusting the tone of the audio data according to the preference equalizer information stored in a play list or ID tag information. To change the preference equalizer information, the changed preference equalizer information is corrected to new preference equalizer information and the preference of the specific frequency band is analyzed.

Description

APPARATUS AND METHOD FOR CONTROLLING EQUALIZER EQUIPED WITH AUDIO REPRODUCING APPARATUS

1 is a block diagram illustrating an equalizer automatic control device provided in an audio reproducing apparatus according to an embodiment of the present invention;

2 is a flowchart illustrating an equalizer automatic control method applied to an audio reproducing apparatus according to an embodiment of the present invention;

3 is a flowchart illustrating a process of selecting / applying preferred equalizer information in FIG. 2 in detail;

4 is a flow chart illustrating in detail the information change / analysis process of the equalizer in FIG.

The present invention relates to an apparatus and a method for controlling an equalizer of an audio reproducing apparatus, and more particularly, to an apparatus and a method for automatically controlling an equalizer using audio additional information in an audio reproducing apparatus.

In general, various equalizers are not only used in portable audio players, but also in high-end audio systems, as well as in mobile terminals (eg, MP3 (MPEG Audio Layer-3) phones) that include a function of performing audio playback due to recent technological developments. It is applied. With the recent development of signal processing techniques, the equalizer has become very fragmented. Therefore, the number of frequency bands that can be set and the number of steps are gradually increasing, and the number of equalizers that can be set has also increased.

Also, for the convenience of users, most of the equalizers provide information of equalizers according to music genres such as Classic, Rock, Jazz, and Pop. The information of the equalizer according to the genre information helps to enjoy the music in an optimal state in consideration of the frequency characteristics of each music genre.

On the other hand, the spread of portable audio devices that play compressed audio files such as MP3 players is increasing rapidly, and recently, the development of mobile terminals with enhanced multimedia functions has been actively made.

A compressed audio file such as an MP3 file played in a mobile terminal having a multimedia function as well as the portable audio device generally includes audio data and additional information thereof (hereinafter referred to as ID tag information). Includes a compression method, a sampling frequency, and bit resolution, and the ID tag information includes information on a song name, artist, album, comment, and genre. Therefore, by using the genre information included in the ID tag information of the audio file, the genre information may be analyzed from the ID tag information when the corresponding file is played, and then the equalizer information may be applied accordingly. The result is audio playback suitable for different genres of music.

However, according to the conventional equalizer control method, all audio files do not include genre information, and although there is genre information, the number of genre information provided by the equalizer information is limited, but the number of genre information that distinguishes actual music is limited. Since more than that, there is considerable inconvenience in using an equalizer function when no specific genre information is provided from the user's point of view. In addition, since the user's hearing characteristics and preferences for specific frequencies are different, the information of the equalizer is not optimized for all users, so it is desirable to apply the information of the equalizer according to the characteristics of the user.

The present invention relates to an apparatus and a method for automatically controlling an equalizer of an audio reproducing apparatus.

The present invention relates to an apparatus and a method for automatically controlling an equalizer of an audio reproducing apparatus according to a frequency band preferred by a user.

Accordingly, the present invention provides a device for controlling an equalizer of an audio reproducing apparatus, comprising: a memory for storing an audio file, an audio processor for decoding the audio file, and a preference reflecting a preference of a specific frequency band preferred by a user An equalizer for adjusting the tone of the decoded audio data according to the equalizer information, and generating the repeated pattern of the frequency band as the preference information and playing the audio file according to the preference equalizer information generated based on the preference. And a control unit for controlling the audio processor and the equalizer.

In addition, the present invention provides a method for controlling an equalizer of an audio reproducing apparatus, the process of generating a predetermined preference information by analyzing an equalizer setting pattern of a specific frequency band preferred by the user, and the preference equalizer information reflecting the preference. Generating and adjusting a tone of audio data according to the preferred equalizer information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

Although the present invention can be applied to a general audio reproducing apparatus, a mobile terminal including an audio reproducing apparatus will be described as an example.

First, an apparatus and a method for automatically controlling an equalizer of an audio reproducing apparatus according to an embodiment of the present invention are summarized. The frequency band is adjusted by adjusting a frequency band of an audio file selected by a user according to preferred equalizer information. The audio file output as an audio signal. On the other hand, if there is no preferred equalizer information, genre information is analyzed from the ID tag information of the audio file, and the frequency band is adjusted with the information of the equalizer whose preference is reflected in the genre information, so that the audio data whose frequency band is adjusted is audible. Output as an audio signal.

Meanwhile, in the embodiment of the present invention, the preference of the equalizer information analyzes a frequency band preferred by the user and sets a repeated pattern of the frequency band as the preference information. In addition, the equalizer information reflecting the preference is defined as preference equalizer information. In addition, the preference assumes that a default value is set in the case of the audio initial operation performed by the mobile terminal.

1 is a block diagram illustrating an equalizer automatic control device included in an audio reproducing apparatus according to an exemplary embodiment of the present invention.

According to an exemplary embodiment of the present invention, the key input unit 101 responds to an equalizer automatic control mode (a mode of playing an audio file according to the information of the equalizer) and a change in the preferred equalizer information by using a keypad provided with various keys. The key input data is provided to the controller 130. The memory 110 corresponds to a flash memory, a hard disk, and the like, and includes an audio data storage 111, an ID tag information storage 113, and a preference storage 115. The audio data storage 111 stores an audio file compression method, a sampling frequency, a bit resolution, and the like. The ID tag information storage 113 stores a playlist, a song name, an artist, and an album of the audio file. Stores comments, genre information, and more. Also, the preference storage unit 115 stores preference information of the equalizer according to the repeated equalizer selection pattern of the user.

According to an embodiment of the present invention, the control unit 130 analyzes the audio file selected by the user when the key is input in the automatic equalizer control mode, and stores the audio data in the audio data storage unit 111 and stores the ID tag information in the ID tag information. Control to store in the section 113. In addition, when changing the preference information, the controller 130 analyzes the preference information of the equalizer by comparing the frequency band between the information of the equalizer reflecting the previous preference and the information of the equalizer for each genre information. In addition, the controller 130 analyzes the genre information from the preferred equalizer information or the ID tag information stored in the memory 110, and then allows the user to control the desired frequency band according to the preferred equalizer information or the information of the equalizer for each genre. 170, the control signal S1 is generated and transmitted to the equalizer 170, and the audio data S2 is transmitted to the audio processor 150.

The display unit 131 may be formed of a liquid crystal display (LCD) or the like. The display unit 131 may control an audio file, a playlist, a preferred genre, and the like by displaying the transmission state or various operation information provided from the controller 130 under the control of the controller 130. Information and the like are displayed on the screen.

The audio processor 150 decodes the audio data S2 received from the controller 130 to reproduce the audio file. The equalizer 170 receives the equalizer control signal S1 applied from the controller 130 and adjusts the frequency band of the audio data decoded by the audio processor 150 according to preferred equalizer information included in the control signal. To adjust the tone. A digital / analog (D / A ") converter 190 converts digital audio data whose tone is controlled by the equalizer 170 into an analog audio signal, and converts the analog audio signal into a speaker 191. Is played through.

Therefore, the present invention applies preferred equalizer information to the audio file selected by the user and outputs the audio signal as an audible audio signal.

2 is a flowchart illustrating an equalizer automatic control method applied to an audio reproducing apparatus according to an exemplary embodiment of the present invention.

According to an embodiment of the present invention, in step 201, the controller 130 applies the preferred equalizer information when the preferred equalizer information exists in the memory 110, while extracting genre information when the preferred equalizer information does not exist. Apply equalizer information reflecting preference. Meanwhile, a detailed process performed in step 201 will be described with reference to FIG. 3. According to an embodiment of the present invention, in step 203, the D / A converter 170 converts digital audio data whose frequency band is adjusted according to the information of the equalizer applied in step 201 into an analog audio signal, and the converted audio signal is It is output through the speaker 191. Also in step 205 The controller 130 determines whether the reproduced audio file is changed by receiving input of changing the preferred equalizer information by the user's selection.

If it is not changed to the preferred equalizer information in step 205, the audio file being played back is continuously played in step 203. If it is changed to the preferred equalizer information, playback of the audio file played in step 209 is stopped, and step 211 is performed. Proceed to

In step 211, the controller 130 changes the preferred equalizer information applied in step 201 to a specific frequency band and corrects it to the preferred equalizer information of the audio file. In addition, in step 211, the controller 130 analyzes the preference based on the frequency difference between the modified preferred equalizer information and the information of the equalizer for each genre information.

Meanwhile, the detailed process performed in step 205 will be described with reference to FIG. 4.

3 is a flowchart illustrating a process of selecting / applying preferred equalizer information in FIG. 2 in detail. According to an embodiment of the present invention, in step 301, the controller 130 determines whether to play the audio file by applying the equalizer automatic control mode to the audio file selected by the user. When the equalizer automatic control mode is not used in the audio file in step 301, the general equalizer information is applied in step 303 and played in step 203 of FIG. The general equalizer information may be, for example, information of an equalizer according to genre information by analyzing genre information of ID tag information or information of an equalizer preset by an user in an audio file.

On the other hand, when using the equalizer automatic control mode in step 301, the flow proceeds to step 305. In step 305, the controller 130 analyzes the audio file selected by the user when inputting the equalizer 150 automatic control mode key in cooperation with the memory 110, separates the audio data and the ID tag information, and then plays the playlist or the ID tag. From the information, it is determined whether the preferred equalizer information exists. If the preferred equalizer information is present in step 305, the process proceeds to step 307 to extract the preferred equalizer information, and in step 309 to apply the extracted equalizer information.

If the preferred equalizer information does not exist in step 305, the process proceeds to step 311. In step 311, the controller 130 determines whether genre information exists in the ID tag information separated in step 305 in the memory 110. If genre information does not exist in step 311, the flow proceeds to step 313 to apply a genre information analysis algorithm.

The genre information analysis algorithm is a generally known algorithm and may analyze genre information by using the following known techniques.

The known genre information analysis algorithm is described in [G. Tzanetakis, P. Cook, "Musical genre classification of audio signals," IEEE Transactions on Speech and Audio Processing, Vol. 10, No. 5, July 2002, pp. 293-302.] and [S. Lippens, J. P. Martens, T. De Mulder, "A comparison of human and automatic musical genre classification," IEEE International Conference on Acoustics, Speech, and Signal Processing, 2004 Proceedings. (ICASSP '04), Vol. 4, May 2004, pp. Iv-233-iv-236. And Xu Changsheng, N.C. Maddage, Xi Shao, Fang Cao, Qi Tian, "Musical genre classification using support vector machines," IEEE International Conference on Acoustics, Speech, and Signal Processing 2003 Proceedings. (ICASSP '03), Vol. 5, 2003.], etc., and genre information can be analyzed, and a detailed description thereof will be omitted since the corresponding technology is described in related literature.

In step 313, the controller 130 analyzes genre information by applying the genre information analysis algorithm, and then, in step 315, the analyzed genre information is modified to genre information of ID tag information. In addition, when genre information exists in step 311 or after performing step 315, the flow proceeds to step 317 to extract genre information from ID tag information.

In step 319 according to an embodiment of the present invention, the equalizer 170 generates the information of the equalizer reflecting the preference by applying the preference according to the present invention to the genre information extracted in step 317. The equalizer 170 registers the information of the equalizer reflecting the preference as the preference equalizer information of the audio file to be played. The registration process of the preferred equalizer information may be performed in units of a plurality of files included in one album in consideration of the user's convenience.

FIG. 4 is a flowchart illustrating an information change / analysis process of an equalizer in FIG. 2. First, FIG. 4 applies information of an equalizer reflecting preference to genre information performed in step 201 (FIG. 3) of FIG. 2, and then, if the audio file played in step 203 can play a satisfactory tone, the equalizer for each genre information may be applied. It can be assumed that the information of equal to the equalizer information. However, since the preferred equalizer information varies according to the hearing characteristics and the preferred frequency band for each user, when the information of the equalizer reflected in the present invention and the equalizer information according to the genre information are different, they can be changed to the analyzed preference information by comparing the frequency bands. have.

Accordingly, when the information of the equalizer for each genre information is changed to the preferred equalizer information in step 205 of FIG. 2, the operation performed in FIG. 4 is performed.

According to an embodiment of the present invention, in step 401, the controller 130 adjusts the frequency band according to the preferred equalizer information by using Equation 2 below in the information of the equalizer for each genre information of FIG. 3, and in step 403, the audio file. Edit and save with your favorite equalizer information. In operation 405, the controller 130 analyzes the preference based on the frequency difference between the modified preferred equalizer information and the information of the equalizer for each genre information.

In step 405, the preference is analyzed using Equation 1 below.

In Equation 1, Ek is a preferred equalizer information value applied in the k th frequency band, and Gk is an information value of an equalizer for each genre information applied in the k th frequency band. M is the number of audio files. Therefore, Pk value is an average of frequency bands according to the information of the preferred equalizer of the audio file selected by the user, and the value is analyzed in units of dB.

Meanwhile, when analyzing genre information in steps 317 to 321 of FIG. 3, the equalizer information performed in step 401 of FIG. 4 is applied since the information of the equalizer reflecting the preference is applied as the preferred equalizer information. The change changes the k-th frequency band of the preference analyzed using Equation 1 using Equation 2 below.

Ek '= Gk' + Pk

In Equation 2, Ek 'is preferred equalizer information to be automatically applied, and Gk' is information of an equalizer for each genre information.

The present invention reproduces an audio file by applying preferred equalizer information when the preferred equalizer information is present in the audio file, and analyzes genre information to reflect the preference in the genre information when the preferred equalizer information does not exist in the audio file. Play the audio file with the information applied. In addition, the present invention analyzes the preference to extract the average of the frequency band from the audio file, it can be applied to change the preferred equalizer information according to the audio file reflecting the analyzed preference.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

According to an embodiment of the present invention, the playlist and ID tag information of the audio file selected by the user are analyzed, and the frequency band is adjusted according to the information of the equalizer preferred by the user, thereby adjusting the frequency band (adjusting the voice). The audio file can be output as an audible audio signal.

It also analyzes audio file genre information and reflects your preferences. You can adjust the frequency band according to the information.

Claims (12)

An apparatus for controlling an equalizer of an audio reproducing apparatus, A memory for storing audio files, An audio processor which decodes the audio file; An equalizer for adjusting a tone of the decoded audio data according to preference equalizer information reflecting a preference of a specific frequency band preferred by a user; And a controller for generating the repeated pattern of the frequency band as the preference information and controlling the audio processor and the equalizer to reproduce the audio data according to the preference equalizer information generated based on the preference. Equalizer automatic control device. The method of claim 1, A key input unit for inputting an equalizer automatic control mode and changing the preferred equalizer information; And a display unit for displaying a play list and the preferred equalizer information on a screen. The method of claim 1, The memory is And the ID tag storage unit for storing ID tag information of at least one of song name, artist, album, comment, and genre information. The method of claim 1, The memory is And the preference storage unit for analyzing the frequency band preferred by the user and storing the preference according to the repeated pattern of the frequency band. In the method for controlling the equalizer (Equalizer) of the audio playback device, Generating predetermined preference information by analyzing an equalizer setting pattern of a specific frequency band preferred by the user; Generating a preference equalizer information reflecting the preference and adjusting a tone of the audio data according to the preference equalizer information. The method of claim 5, wherein The preferred equalizer information is stored in the playlist and ID tag information, characterized in that the automatic equalizer control method. The method of claim 5, wherein Changing the preferred equalizer information when changing the preferred equalizer information; Modifying the changed preferred equalizer information to preferred equalizer information; Equalizer automatic control method characterized in that it further comprises the step of analyzing the preference of the specific frequency band that the user prefers. The method of claim 5, wherein The method of claim 1, further comprising applying general equalizer information when the equalizer automatic control mode is not used. The method of claim 5 The process of analyzing the preferences Analyzing the frequency band preferred by the user; And setting the repeated pattern of the frequency band as the preference information. The method of claim 5, wherein The process of selecting and applying the preferred equalizer information Extracting the preferred equalizer information from the audio data when the preferred equalizer information exists; Equalizer automatic control method comprising the step of applying the extracted preferred equalizer information. The method of claim 10, If the preferred equalizer information does not exist, Determining whether the genre information exists in an audio file, analyzing the genre information when the genre information exists, and applying information of an equalizer reflecting the preference to the genre information; Equalizer automatic control method further comprising the step of applying the information of the equalizer reflecting the preference as the preferred equalizer information. The method of claim 11, If the genre information does not exist in the audio file, Analyzing the genre information by applying the genre information analysis algorithm; The method of claim 1, further comprising modifying the analyzed genre information to the genre information.

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