KR101430466B1 - Method and apparatus for an audio signal processing - Google Patents

Abstract

According to another aspect of the present invention, there is provided a method for reproducing a program, the method comprising: analyzing program-related data from an audio signal; checking whether an error exists in the program-related data; And decoding the audio signal based on the obtained parameters, wherein the program related data represents an extended field of variable length.

DAB, equalizer

Description

TECHNICAL FIELD [0001] The present invention relates to an audio signal processing method and apparatus,

2. Description of the Related Art In recent years, researches on devices capable of transmitting audio broadcasting, video broadcasting, and data broadcasting in a digital manner other than the conventional analog broadcasting, and transmitting and displaying them have been actively conducted, and some of them have been commercialized. For example, a broadcasting system that transmits digital audio broadcasting, video broadcasting, data broadcasting, and the like is referred to as lecture-based digital broadcasting. For example, digital audio broadcasting (Digital Audio Broadcasting) and digital multimedia broadcasting (Digital Multimedia Broadcasting) are available as the digital broadcasting. In the case of the digital broadcasting, it is possible to provide various multimedia information services at an inexpensive price, utilize it for mobile broadcasting according to frequency band allocation, create a new revenue source through additional data transmission service, And that it can achieve enormous industrial effects.

In the case of DAB broadcasting, there is no consideration of the equalizer function. Therefore, in case of music which is mainly broadcasted at present, the user must directly operate the equalizer according to the characteristics of the music. In addition, you can send information about the equalizer settings to the FIC (Fast Information Channel) or give information about the equalizer settings to the F-PAD (Fixed field of Program Associated Data). However, all of these schemes can not perform CRC (Cyclic Redundancy Check) transmission, and thus are vulnerable to errors.

The decoder is decoded by the MPEG1 Layer II or MPEG2 Layer II and decoded by the A / D converter. The Program Associated Data (PAD) There is no information as to which equalizer characteristic to use. The equalizer function that can express the characteristics of each music better is already used in portable MP3 device, PMP (Portable Media Player) device, or portable DMB device, but in case of DAB broadcasting, This lack of information has not been saved due to lack of information.

The present invention relates to a method for using an equalizer function suitable for music using data transmitted from a broadcaster during a DAB broadcast. It also proposes a parameter for adjusting different sound pressure for DAB broadcasting and a parameter for transmitting information about the start and end of music.

The method includes analyzing program related data (PAD) from an audio signal, checking whether there is an error in the program related data, determining a parameter indicating a characteristic of music from the program related data if there is no error And decoding the audio signal based on the obtained parameter, wherein the program-related data represents a variable-length extended field (Variable X-PAD) .

Also, in the present invention, the variable-length extended program-related data field includes application type information, and the application type information corresponds to a parameter indicating a characteristic of the music.

In the present invention, the parameters indicating the characteristics of the music include an equalizer setting parameter, a parameter indicating the beginning and end of the music, and / or a parameter indicating the volume of the music.

In the present invention, when the application type information corresponds to the equalizer setting parameter, the audio signal is decoded based on the equalizer setting parameter.

In addition, the present invention includes a step of inserting a parameter indicating the characteristics of music in a variable-length extended program-related data field (Variable X-PAD) and transmitting the parameter-inserted audio signal to a signal receiver, Wherein the parameters indicating the characteristics of the music include an equalizer setting parameter, a parameter indicating the start and end of the music, and / or a parameter indicating the volume of the music.

According to another aspect of the present invention, there is provided a broadcast receiver capable of receiving a digital broadcast, comprising: a tuner unit for inputting a broadcast stream into which a parameter indicative of a characteristic of music is inserted in a variable-length extended program related data field (Variable X- And an audio signal decoding unit decoding the inputted broadcast stream using the parameter.

In the DAB, the parameters that can set the equalizer for the music broadcast are transmitted, and the DAB player extracts the parameter and sets the characteristic according to the genre, thereby providing the user with the quality service of the better quality.

1 is a schematic block diagram of a broadcast receiver 100 capable of receiving an audio signal according to an embodiment of the present invention.

A broadcast receiver capable of processing an audio signal according to the present invention will now be described. A broadcast receiver 100 according to the present invention includes a user interface 110, a controller 120, a tuner 130, a data decoding unit 130, An audio decoding unit 150, a speaker 160, a video decoding unit 170, and a display unit 180.

The broadcast receiver 100 may be a television, a mobile phone, a digital multimedia broadcasting device, or the like capable of receiving and outputting a broadcast signal. The user input unit 110 transmits the command to the controller 120 when the user inputs a command such as channel adjustment, volume adjustment, and the like. The control unit 120 may organically control the functions of the user input unit 110, the tuner unit 130, the data decoding unit 140, the audio decoding unit 150 and the video decoding unit 170 It plays a role. The tuner unit 130 receives information on a channel from a frequency corresponding to the control information of the controller 120. The information output through the tuner unit 130 is divided into main data, service data, and the like, and is demodulated in a packet unit. The data are demultiplexed and output to respective data decoders in accordance with the control information of the controller 120.

The data decoding unit 140 may receive the data information and perform decoding. The audio decoder 150 receives the compressed audio signal according to a specific audio coding scheme and reconstructs the audio signal to be output through the speaker 160. At this time, the audio signal may include parameter information capable of indicating the characteristics of the music, for example, a parameter for setting an equalizer, a parameter for indicating the beginning and end of music, or a parameter for volume of music.

The audio decoding unit 150 may include one or more of an AAC decoder, an AAC-SBR decoder, an AAC-MPEG SURROUND decoder, and an AAC-SBR (with MPEG SURROUND) decoder. And may decode the audio signal based on parameter information indicating characteristics of the music. The video decoder 170 receives the compressed video signal according to a specific video coding scheme and reconstructs the video signal to be output through the display unit 180.

FIG. 2 shows a schematic structure of an audio signal frame for transmitting a parameter indicating the characteristics of music, to which the present invention is applied.

Program Associated Data (PAD) information transmitted in the current DAB broadcasting may include DLS (Dynamic Label System) information and a slide show. The PAD represents the synchronization information for the audio, and the contents of the PAD are closely related to the audio. The PAD channel may be composed of PAD bytes in successive audio frames. The PAD bytes may be located at the end of each audio frame.

As an embodiment to which the present invention is applied, the PAD can be used to transmit information related to music as well as information for additional subtitle information and screen background. For example, when a DAB broadcast including a parameter capable of expressing the characteristics of music is performed near the starting point of music, it is possible to provide a better music related service to the user in conjunction with the equalizer in the DMB player.

A method for transmitting equalizer data that can be used in DAB broadcasting may be as follows. For example, a fixed program-related data field (hereinafter referred to as F-PAD), a limited program-related data field (hereinafter referred to as Short X-PAD) (Variable X-PAD) or the like may be used as the program-related data field.

Referring to FIG. 2, the PAD field may include an F-PAD field and an X-PAD field. The F-PAD can transmit control information having real-time characters and data with a very low bit rate. The F-PAD may be present at the end of an audio frame with a size of 2 bytes. You can use the byte L indicator (Byte L Indicator) in the second byte from the end of the audio frame as an equalizer and put the information about the actual music type in the next byte.

In addition, the PAD channel can be extended using the X-PAD field, and information for providing an additional function to the listener, such as information related to the text, can be transmitted. The length of the X-PAD field may be selected by the service provider.

The F-PAD channel transmits an X-PAD indicator, which is a 2-bit field, which may indicate any of the following three values for the length of the X-PAD field. First, No X-PAD can only use the F-PAD field. Second, Short X-PAD can collect information of 2 byte Short X-PAD. In this case, the length of the X-PAD may be 4 bytes per audio frame, and the entire X-PAD field is in the protected portion of the audio frame. That is, a total of 6 bytes can be transmitted in the PAD. In addition, a variable X-PAD can be more efficient because a 2-byte Short X-PAD needs to collect data again by collecting a plurality of frames.

In Variable X-PAD, the length of the X-PAD may vary from frame to frame. The length of the X-PAD field in the audio frame is the result of calculating the content information transmitted in the X-PAD field. The application data delivered on the X-PAD channel may require future error protection. In order to transmit the application data, a content indicator must be transmitted, and the content indicator may signal the application type. An application type signaled by the content indicator is as shown in FIG. This will be described in detail in FIG.

Figure 3 illustrates an application type that is signaled by a content indicator, in an embodiment to which the present invention is applied.

Application data can be defined as an application type. Among the application types, the remaining application type information other than the end markers may include a type indicating the start of the application data and a type indicating intermediate data of the application data. If an application type indicating the start of the application data is displayed, the previous data is completed as one data group, and new data is collected again. The end marker can be transmitted in the Variable X-PAD described in FIG. 2, which indicates the end of a Content Indicator List. Such an end marker may be set to an application type value of zero. The content indicator list can be transmitted up to a maximum of four in the same X-PAD.

Referring to FIG. 3, 16 to 22 of the application type values are not currently used. Therefore, one of the above values can be selected to set parameter information that can indicate the characteristics of the music. For example, parameter information for setting the equalizer, information indicating the start and end of the music, or information about the volume of the music can be set to the application type value that is not currently used. For example, if the genre of music is set using the application type, the DAB player can extract the genre of the music to set a characteristic corresponding to the genre, and can further highlight characteristics such as a sound field effect.

FIG. 4 is a flowchart illustrating a method of setting an equalizer function using parameter information indicating characteristics of music according to an embodiment of the present invention. Referring to FIG.

First, program related data (PAD) is analyzed from the received audio signal (S410). At this time, the program-related data may include a variable-length extended program-related data field (Variable X-PAD). Then, it is possible to check whether there is an error in the program related data (S420). If it is determined that there is no error, the parameter indicating the characteristic of music can be obtained from the variable-length extended program-related data field (S430). Here, the variable-length extended program related data field may include application data, and the application data may be defined as an application type. For example, one of the values of the reserve area that is not currently used among the application types may be selected to set parameter information indicating the characteristics of the music. As a specific example, a parameter for setting the equalizer, a parameter for indicating the start and end of the music, and / or a parameter for the volume of the music can be set to the application type value that is not currently used. When the genre of the music is set using the application type, the DAB player can extract the genre and set the characteristic according to the genre. The audio signal may be decoded based on the obtained parameter (S440). For example, if the application type corresponds to an equalizer setting parameter, the audio signal can be decoded based on the equalizer setting parameter.

Embodiments of the present invention are applicable to all DMB players that currently have an equalizer. For example, it is possible to extract the genre information from all the sound sources having the current broadcast time genre information, and send the corresponding genre information to the DAB broadcast. Also, it is possible to use the equalizer function by transmitting parameters that can show the characteristics of music even in the DMB broadcasting instead of the DAB.

In addition to the equalizer function, MP3 ID3 tags can be transmitted. Especially, information on the start and end of music and information about the volume of music can be transmitted to users.

The signal processing apparatus to which the present invention is applied is provided in a multimedia broadcasting transmitting / receiving apparatus such as a DMB, and can be used for decoding a video signal, a data signal, and the like. Also, the multimedia broadcasting transmitting / receiving apparatus may include a mobile communication terminal.

In addition, the signal processing method to which the present invention is applied may be a program for being executed in a computer and stored in a computer-readable recording medium. The multimedia data having the data structure according to the present invention may be recorded in a computer- Can be stored in the medium. The computer-readable recording medium includes all kinds of storage devices in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission via the Internet) . In addition, the bit stream generated by the signal processing method may be stored in a computer-readable recording medium or transmitted using a wired / wireless communication network.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. , Alteration, substitution, addition, or the like. It is also possible to provide a medium for storing data applying at least one feature according to the present invention.

1 is a schematic block diagram of a broadcast receiver 100 capable of receiving an audio signal according to an embodiment of the present invention.

FIG. 2 shows a schematic structure of an audio signal frame for transmitting a parameter indicating the characteristics of music, to which the present invention is applied.

Figure 3 illustrates an application type that is signaled by a content indicator, in an embodiment to which the present invention is applied.

FIG. 4 is a flowchart illustrating a method of setting an equalizer function using parameter information indicating characteristics of music according to an embodiment of the present invention. Referring to FIG.

Claims (8)

Analyzing program related data from the audio signal; Checking whether there is an error in the program related data; Acquiring a parameter indicating a characteristic of the music from the program-related data when there is no error; And Decoding the audio signal based on the obtained parameter , ≪ / RTI & Wherein the program related data is stored in an extended field of variable length. The method according to claim 1, Wherein the variable length extended field includes application type information, and the application type information indicates a parameter indicating a characteristic of the music. 3. The method of claim 2, Wherein the parameters indicating the characteristics of the music include an equalizer setting parameter, a parameter indicating the start and end of the music, and / or a parameter indicating the volume of the music. The method of claim 3, And if the application type information indicates an equalizer setting parameter, decoding the audio signal based on the equalizer setting parameter. Inserting a parameter indicative of characteristics of music in a variable-length extended program-related data field; And transmitting the parameter-inserted audio signal to a signal receiver, Wherein the parameters indicating the characteristics of the music include an equalizer setting parameter, a parameter indicating the start and end of the music, and / or a parameter indicating the volume of the music. 6. The method of claim 5, Further comprising the step of inserting the error check information of the program-related data into the variable-length extended program-related data field. 6. The method of claim 5, Wherein the variable-length extended program-related data field includes application type information, and the application type information indicates a parameter indicating a characteristic of the music. 1. A broadcast receiver capable of receiving a digital broadcast, A tuner unit for inputting a broadcast stream into which a parameter indicative of characteristics of music is inserted in a variable-length extended program related data field (Variable X-PAD); An audio signal decoding unit for decoding the input broadcast stream using the parameter, And a digital broadcast receiver.

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