KR20060098793A - Digital broadcasting terminal and broadcasting presentation method using the same - Google Patents

Abstract

 The present invention relates to a digital broadcast terminal, and more particularly, to a digital broadcast terminal capable of visually expressing audio of a received broadcast and a broadcast presentation method using the same. The present invention includes determining whether a channel of a received broadcast is an audio-only channel; A volume extraction step of extracting a volume of audio from broadcast information of the channel when it is determined that the audio-only channel is present in the step; And converting the extracted volume into a graphic signal and displaying the same on a screen, and a digital broadcasting terminal capable of realizing the method.

According to the present invention, when viewing an audio-only channel, the variable characteristics of the audio of the channel can be visualized to eliminate monotony of viewing and damage to the display unit of the digital broadcasting terminal.

Visualization, terminal

Description

 Digital broadcast terminal and the method of broadcast display using the terminal

1 is a flowchart illustrating a digital broadcast presentation method according to the present invention.

2 is a block diagram showing an embodiment of a digital broadcast display terminal according to the present invention;

3 is a diagram illustrating a display screen implemented with a digital broadcast presentation method and a digital broadcast presentation terminal according to the present invention.

<Description of the symbols for the main parts of the drawings>

600: audio decoder 610: volume extraction unit

620: audio output unit 630: visualization unit

640: On-Screen Display (OSD) unit 650: Video output unit

 The present invention relates to a digital broadcast terminal, and more particularly, to a digital broadcast display terminal capable of visually expressing audio of an input broadcast and a broadcast presentation method using the same.

One of the characteristics of digital broadcasting is that so-called multi-channelization is possible. Unlike analog broadcasting, digital broadcasting can export many programs in one bandwidth. Since audio has less amount of data transmitted and received than video, many channels specializing in music or news without video are being provided in digital broadcasting.

The digital broadcasting channel, which is provided with no video and only audio (hereinafter, referred to as an audio-only channel), is called ATSC audio-only in the Advanced Television Systems Committee (ATSC) method, and the Virtual Channel Table of the Program and System Information Protocol (PSIP) ), It is possible to distinguish an audio-only channel as a service type field.

In the digital video broadcasting (DVB) scheme, an audio-only channel can be distinguished as a service type field among service descriptors in a service description table (SDT) of service information (SI).

The service provided to the audio dedicated channel is called a digital radio sound service.

Conventionally, when an audio-only channel is displayed in a broadcast terminal, the screen to be displayed simply displays only channel information or an arbitrary still image for an audio channel on the display screen. However, this method not only provides visual monotony to the user watching the broadcast, but also causes damage to the display unit of the broadcast terminal by displaying the same screen that is stopped when the audio-only channel is displayed on the screen for a long time. There was a problem.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to visually display an input voice of a broadcast on a screen when a user watches an audio-only channel, thereby avoiding the monotony on the screen, The present invention provides a digital broadcast video presentation method that prevents damage and a digital broadcast terminal that executes the above method.

 In order to achieve the above object, the present invention comprises the steps of determining whether the channel of the received broadcast is an audio dedicated channel; A volume extraction step of extracting a volume of audio from broadcast information of the channel when it is determined that the audio-only channel is present in the step; And converting the extracted volume into a graphic signal and displaying the extracted volume on a screen.

In addition, the present invention is a volume extraction unit for extracting the volume of audio of the broadcast information of the audio-only channel; A visualization unit for converting volume information of the extracted audio into a graphic signal; And a video output unit configured to output the converted signal to a screen.

Preferably, the terminal further includes an on-screen display (OSD) unit for adding channel information before outputting the graphic signal converted by the visualization unit on the screen.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

Referring to FIG. 1, a digital broadcast presentation method according to the present invention will be described. 1 is a flowchart illustrating a digital broadcast presentation method according to the present invention.

When the digital broadcast is received by the digital broadcasting terminal and a specific channel is selected by the user or the system (step 90), it is determined whether the selected channel is an audio-only channel (step 100).

Whether the channel is an audio dedicated channel may be determined as a service type value of ATSC-PSIP or a service type value of DVB-SI. Unlike ATSC broadcasting, however, in DVB broadcasting, the transmission repetition period of SDT is 2 seconds at maximum. Therefore, when the channel is switched while the service type value of the channel being watched by the user is extracted in the DVB broadcast, the service type value of the switched channel must be extracted again, which may delay the operation of the digital broadcasting terminal. have. In addition, the above service type value is often not correctly observed in the actual broadcast.

Therefore, it is preferable to determine whether an audio-only channel is made based on packet identifier (PMID) information of a PMT (Program Map Table; PMT) rather than the service type value.

To do so, first if any channel is selected (step 90), the PMT information of the channel is analyzed (PMT Parsing) (step 110). If the analyzed PMT information includes a video PID (step 120), the channel includes a video signal and thus is divided into a general channel (step 400). If there is no Video PID, it is checked whether an Audio PID exists (step 130). If it is determined in step 130 that the Audio PID exists, the selected channel is an audio-only channel without audio and no video (step 190). If there is no Audio PID, it is divided into a data channel having neither video nor audio (step 500).

In other words, after extracting stream type from PMT (Program Map Table), if the type value is 0x01 and 0x02, it is Video type, and if it is 0x03 and 0x04, it is Audio type. Channels can be distinguished accurately.

For reference, whether the channel is an audio-only channel for a channel to be broadcast at any time, not a channel that is currently being broadcast, the service type (with the channel number and name when storing the channel in the channel list of the EPG) service type) and an audio dedicated channel can be identified by the service type value.

If the channel selected by the above process is an audio-only channel, a volume extraction step of extracting a volume of audio from the broadcast information of the channel is performed next (step 200). In the step (step 200), the audio of the audio-only channel is converted into an audio pulse code modulation (PCM) by the audio decoder, and a value corresponding to a volume is extracted from the audio PCM value.

When the value corresponding to the volume is extracted, the extracted value is converted into a graphic signal, and the converted graphic is displayed on the screen (step 300).

The volume extraction step and the step of expressing the volume graphically will be described in more detail in the detailed description of the digital broadcasting terminal capable of realizing the digital broadcasting presentation method according to the present invention.

Referring to FIG. 2, a digital broadcasting terminal according to the present invention will be described. FIG. 2 is a diagram illustrating a configuration of a digital broadcast presentation terminal capable of visualizing and expressing a voice of the channel in an audio-only channel.

That is, when it is determined that the channel is an audio-only channel, the audio signal of the channel is decoded by the audio decoder 600 and output as PCM (Pulse Code Modulation) data. The PCM data is output as an audible sound from the audio output unit 620 via the volume extraction unit 610.

In addition, the volume extraction unit 610 may extract a value corresponding to the volume from the PCM data. For example, the value corresponding to the volume may be a decibel value, and more preferably, it is extracted as a decibel value for each frequency band. The extraction period of the extracted volume value may be adjusted so that the displayed graphic may be brought to the user in consideration of the performance of the graphic processor. The extracted volume is input to the visualization unit 630 and the volume value extracted from the visualization unit 630 is visualized and converted into a video signal.

 For example, the visualization unit 630 may generate a bar graph in which the frequency of sound is the horizontal axis and the decibel value is the vertical axis. It is also possible to generate other graphs or shapes using values corresponding to loudness, such as decibel values.

The converted video signal is input to an On Screen Display (OSD) unit 640. The OSD unit 640 may add channel information such as a channel number and a name to the graphic output from the visualization unit 630 and display the same on the screen. The visualization screen of the audio information processed by the OSD unit 640 is displayed to the outside via the video output unit 650.

3 is a diagram illustrating an example of a display screen implemented by a digital broadcast presentation method and a digital broadcast presentation terminal according to the present invention. In FIG. 3, the height of the bar graph may be changed according to the change of the voice, and may be changed so that the viewer can feel the liveness according to the time.

 The effects of the digital broadcast presentation method and the digital broadcast presentation terminal according to the present invention described above are as follows.

First, the present invention can realize a lively screen by graphically displaying a change in voice in an audio-only channel, thereby increasing satisfaction in digital broadcasting viewing.

Second, damage to the display unit of the display terminal can be prevented by outputting a screen that varies according to a change in voice.

Claims (4)

Determining whether the channel of the received broadcast is an audio-only channel; A volume extraction step of extracting a volume of audio from broadcast information of the channel when it is determined that the audio-only channel is present in the step; And And converting the extracted volume into a graphic signal and displaying the extracted sound volume on a screen. A volume extraction unit for extracting a volume of audio from broadcast information of an audio-only channel; A visualization unit for converting volume information of the extracted audio into a graphic signal; And And a video output unit for outputting the converted signal to a screen. The method of claim 2, The terminal further comprises an on-screen display (OSD) unit for adding the channel information before outputting the graphic signal converted by the visualization unit on the screen. The method of claim 2 or 3, The volume extracting unit is a digital broadcasting terminal, characterized in that for extracting the volume from the PCM value of the audio signal received in the audio dedicated channel.

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