KR20080016033A - Method for selectively reproducing digital audio - Google Patents

Abstract

A method for selectively reproducing digital audio is provided to increase user convenience by automatically skipping a digital audio file of low quality. A tone quality information value recorded in a digital audio file is detected(S10). The detected tone quality information value and the predetermined set value are compared(S13). Whether to play the digital audio file is determined depending on the comparison result. The information on the bit rate and/or the sampling frequency recorded in each audio frame of the digital audio file is detected(S12). The digital audio file is played if the tone quality information value is the same as the predetermined set value, and the digital audio file is skipped and the next digital audio file is played if not(S14).

Description

How to play digital audio selection {Method for selectively reproducing digital audio}

1 illustrates a configuration of a music selection playback apparatus in a digital audio device according to an embodiment of the present invention.

2 is a flowchart illustrating a method for reproducing a music selection in a digital audio device according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

10: buffer

11: Sound quality detector

12: Micom

13: codec

14: D / A Converter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reproducing a selection of digital audio. For example, sound quality information such as bit rate and sampling frequency recorded in a digital audio file of a standard such as MP3 or Window Media Audio (WMA) can be obtained. It detects and plays the digital audio file only when the user falls within the preset value range, and automatically skips when it is out of the range. It is about.

Currently, MP3, WMA, MPC, and OGG are used as storage formats for digital audio files. Among them, MP3 and WMA are the most widely used storage formats.

 MPEG (moving picture experts group) Audio Layer-3 (hereinafter referred to as MP3) is a technology for compressing digital audio data.It is a computer voice file that stores music files stored on a compact disk (CD). If you create a wave file, it takes about 50MB per song, but using MP3 technology, you can compress a 50MB wave file to 4.5MB.

In addition, Windows Media Audio (WMA), another storage format for digital audio files, supports streaming in the WMA file format, half the size of MP3 data, and the Windows Media Rights Manager, a copyright protection technology. It has a big advantage that it has a built-in 'playback player' in the Windows operating system.

As a player capable of playing digital audio data standards such as MP3 or WMA, a computer, an MP3 player, or an MP3 CD player has been used. The MP3 CD player functions as a CD player and an MP3 player. Although there is an advantage that can be performed at the same time, it is inconvenient to carry, and because of the disadvantage of inconvenient storage and deletion of the file, it is rarely used at present, and at present, an MP3 player or a mobile phone equipped with an MP3 player function is widely used.

Meanwhile, music files stored in a CD, an MP3 memory, or a hard disk (HDD) include a file type such as MP3, WMA, OGG, or MPC. In the process of converting a music file stored in a CD into a computer voice file, In order to make small, the bit rate (unit: Kbps) or the sampling frequency (unit: Khz) are set to low. The bit rate represents the amount of data required to reproduce one second of data, and the sampling frequency represents the level of detail in digital recording of analog sound.

Factors that affect the size and sound quality of digital audio files include bit rate, sample size, sampling frequency, and number of channels. The relationship is shown in the table below.

Sampling frequency (Khz) Sample size channel Bit rate (Kbps) File size Duration (s) 44.1 16 bit Stero 128 946 60 44.1 16 bit Mono 128 946 60 44.1 16 bit Mono 64 474 60 44.1 8bit Mono 128 946 60 44.1 8bit Mono 64 474 60 32.0 16 bit Mono 56 413 60 32.0 16 bit Mono 48 355 60 32.0 8bit Mono 56 413 60 32.0 8bit Mono 48 355 60

TABLE 1

When digital audio files having various sound quality such as bit rate and sampling frequency are mixed and stored in a directory or CD of a computer hard disk, it is cumbersome and troublesome to classify the digital audio files. It is often played back at once.

However, a digital audio file whose bit rate or sampling frequency is set too low in order to reduce the capacity of the digital audio file has a very poor playback quality, so that a sensitive user may have considerable discomfort and when such music is played back. Each time a user must skip the music using a button or a remote control, it is not only uncomfortable and annoying, but also causes a problem that the impression felt through listening to music is halved.

Accordingly, the present invention was created to solve the above problems, and detects sound quality information values such as bit rates and / or sampling frequencies recorded in digital audio files, and corresponds to a range of values preset by the user. The present invention provides a method for reproducing a selection of digital audio, which plays only a digital audio file having a good sound quality by playing a corresponding digital audio file only and automatically skipping when the digital audio file is out of range.

In order to achieve the above object, a method for reproducing music selection of digital audio includes: detecting a sound quality information value recorded in a digital audio file, comparing the detected sound quality information value with a preset value, and the sound quality information value and a predetermined value. And determining whether to play the digital audio file according to a comparison result of the set value.

In this case, the detecting step detects the information of the recorded bit rate and / or sampling frequency included in each audio frame constituting the digital audio file.

In the determining step, when the sound quality information value satisfies a preset value, the digital audio file is played. When the sound quality information value does not meet the preset value, the digital audio file is skipped and the next step is performed. Play the song.

The digital audio file may be configured in a file format such as MP3, WMA, OGG, or MPC.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of a method for reproducing music selection of digital audio according to the present invention will be described in detail with reference to the accompanying drawings.

Conventionally, as described above, when a music file having a low playback sound quality with an excessively low bit rate or sampling frequency is reproduced at a time, the sensitive user has a significant discomfort, so that each time such music is played, There was a problem that the music must be skipped using a button or a remote control.

However, in the present invention, the music of low reproduction quality is skipped by using the automatic selection function, so that only music of a predetermined sound quality is reproduced. For example, based on the information recorded in the header of the music file, music files with a sampling frequency of less than 44.1 kHZ and a bit rate of 128 Kbps are skipped without being played back, so that the user does not care about the sound quality of the music being played. You can only immerse yourself in appreciation.

FIG. 1 is a block diagram of a music playback apparatus in a digital audio apparatus according to an embodiment of the present invention, wherein the apparatus stores a hard disk, a flash memory, a CD, or the like, in which digital audio files to be reproduced are stored. The sound quality detection unit 11, the decoder 13, and the microcomputer to detect the sound quality of the data file based on the storage medium 10 and the bit rate and / or sampling frequency of the data file recorded on the storage medium 10. 12) and so forth.

Meanwhile, the storage medium 11 stores digital audio files having a standard such as MP3 or WMA, and the microcomputer 12 reads the digital audio files recorded on the storage medium 11 and the sound quality detection unit ( 11) by comparing the value detected through the preset value, and after determining the sound quality of the digital audio file, if it is determined that the sound quality is appropriate, the decoder 13 controls to decode and reproduce.

The sound quality detection unit 11 detects a bit rate and / or a sampling frequency value recorded in a header of the recorded and stored digital audio file. FIG. 2 shows a structure diagram of an MP3 file as an embodiment of the digital audio file. .

MP3 has a structure of a frame unit, and one frame is composed of an audio access unit (AAU) unit. In addition, at the end of the AAU set, that is, the end of the MP3 file, an audio tag is added, and additional information of the entire MP3 file such as artist information, song title, album title, and year of publication is included. Occupies the capacity of.

In addition, each frame is divided into a header, a CRC check, side info, main data, and additional data. The header includes a synchronization pattern, a version of MPEG audio, a layer classification, a bit rate, a sampling frequency, and extended mode information. The decoder makes a sound through the header information of the frame. Instead of analyzing the header information of each frame, the decoder processes the whole with the header information of the first frame.

The CRC Check has information for checking an error of a frame, the side info has information necessary for decoding the main data of each frame, and the main data contains substantial audio data.

Hereinafter will be described in detail the operation method of the above items.

3 is a flowchart illustrating a music playback method in the digital audio device according to the present invention, which will be described with reference to the MP3 file structure diagram of the music playback device configured as described above with reference to FIGS. 1 and 2.

The user sets the bit rate and / or sampling frequency values to select and listen to only the desired sound quality before or after the playback operation of the music playback apparatus of the digital audio music file. In one embodiment of the present invention, the sampling frequency is set to 44.1 kHZ, and the bit rate is set to 128 Kbps (S10).

When the digital audio device is reproduced and operated, audio data is read from the audio music file recorded on the playback medium 10 (S11).

Meanwhile, the sound quality detector 11 detects a bit rate and / or a sampling frequency value included in the header of the audio file (S12).

The microcomputer 12 compares the value set by the user with the value detected by the sound quality detector 11 to check the sound quality of the audio data (S13).

Through the comparison as described above, when the value detected by the sound quality detection unit 11 falls within the range of the value set by the user, the corresponding audio music data is reproduced and output (S14).

However, if the detected value does not reach the set value, the corresponding audio file is skipped and the above operation for reproducing the next audio file is repeated (S15).

For reference, the present invention is not limited to an MP3 player and an MP3 CD player capable of reproducing and outputting digital audio data of a standard such as MP3 or WMA, and may be applied to various digital audio data devices.

As mentioned above, preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art can improve other various embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. Changes, substitutions or additions will be possible.

In order to achieve the above object, a method for reproducing music selection of digital audio according to the present invention includes detecting a sound quality information value such as a bit rate and / or a sampling frequency recorded in a digital audio file, and selecting a range of values preset by a user. Plays the audio file only when it is in the range, and automatically skips when it is out of range, so that users who are sensitive to low sound quality have to skip using the operation button or the remote control every time the music is played. You can solve the annoying problem.

Claims (4)

Detecting a sound quality information value recorded in the digital audio file; Comparing the detected sound quality information value with a preset value; And And determining whether to play the digital audio file according to a comparison result of the sound quality information value and a preset value. The method of claim 1, The first step is to detect the information of the bit rate and / or sampling frequency recorded in each audio frame constituting the digital audio music file. The method of claim 1, In the third step, if the sound quality information value satisfies a preset value, the digital audio file is played. If the sound quality information value does not meet the preset value, the digital audio file is skipped and the next digital audio file is skipped. A method for reproducing a selection of digital audio, characterized in that for playing a file. The method of claim 1, The digital audio file is a file selection playback method of digital audio, characterized in that the file format of MP3, WMA, OGG or MPC.

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