JP2009182923A - Mobile digital television receiver set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable reception of a digital television broadcast program with a constant quality even when a television receiver set is moved to a location where the set is placed in a poor broadcast wave reception condition. <P>SOLUTION: A wireless communication unit 15 receives data about digital television broadcast program from a wireless network and stores the data in a memory. A controller 16 compares broadcast wave data received at a TV tuner 14 with the data received at the wireless communication unit 15. When finding lack of the broadcast wave data, the controller complements the lack with the data from the wireless network. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile digital television receiver.

  In order to view a TV program while moving in a car using a mobile phone having a TV reception function without a GPS function, when moving from one broadcast area to the next broadcast area, It is necessary to change the frequency to a frequency of a broadcasting station that can be received in the next broadcasting area. In that case, it is necessary to prepare a broadcast station list indicating the frequency of the broadcast station in advance, or scan a receivable broadcast station and set the broadcast station. When moving while viewing a program, it is convenient to automatically receive a broadcasting station broadcasting the same program in the destination area.

  Patent Document 1 describes that a mobile phone with a television receiver communicates with a radio base station to acquire an electronic program guide, and uses the electronic program guide to acquire channel selection information necessary for digital broadcast reception. ing.

Patent Document 2 describes that a portable digital broadcast receiving terminal acquires channel selection information of a broadcasting station via a mobile communication network.
Patent Document 3 describes that in a television receiver having an Internet reception function, a connection state by a telephone line can be confirmed on the screen of the television receiver while receiving a television signal. Yes.

By the way, if you are moving while receiving a digital TV broadcast using a mobile phone with TV reception function, if you pass through a place where the reception level of the broadcast wave is low, some of the digital broadcast data will be lost and the image quality will be lost. May deteriorate.
JP 2005-26914 A JP 2004-282350 A Japanese Patent Laid-Open No. 10-84511

  An object of the present invention is to make it possible to receive a digital television broadcast with a constant quality even when moving to a place where the reception state of the broadcast wave is bad.

  The mobile digital television receiver of the present invention includes a first digital broadcast receiving means for receiving a digital television broadcast from a broadcast network, a second digital broadcast receiving means for receiving a digital television broadcast from a wireless communication network, and the first The first digital broadcast data received by the first digital broadcast receiving means is compared with the second digital broadcast data received by the second digital broadcast receiving means, and the missing portion is complemented by the second digital broadcast data. Control means.

  According to the present invention, the first digital broadcast data received from the broadcasting station can be supplemented by the second digital broadcast data received from the wireless communication network, so that the broadcast wave has been moved to a place where the reception state is poor. Even in this case, the digital television broadcast can be received with a certain quality.

  In the mobile digital television receiver, the video data and audio data of the first digital broadcast data and the second digital broadcast data are stored in a video buffer and an audio buffer for each predetermined data unit, respectively, and the control is performed. The means compares the first digital broadcast data stored in the video buffer and the audio buffer with the video and audio data of the second digital broadcast data, and the missing portion is compared with the video buffer and the audio data. The second digital broadcast data stored in the buffer is complemented with the corresponding video and audio data.

  With such a configuration, the missing portion of the video and audio data received from the broadcasting station can be supplemented with the data received from the wireless network.

  ADVANTAGE OF THE INVENTION According to this invention, even when it moves to the place where the receiving condition of a broadcast wave is bad, digital broadcast data can be received with fixed quality.

Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a diagram illustrating a circuit configuration of a mobile digital television receiver (for example, a mobile phone with a television function) according to an embodiment.
The mobile digital television receiver 11 includes an antenna 12 for receiving a digital broadcast signal, an antenna 13 for transmitting / receiving a radio signal, a TV tuner unit 14, a radio communication unit 15, and a control unit 16.

  The TV tuner unit 14 extracts video and audio data from the first digital broadcast data received by the antenna 12 and stores it in a memory (not shown) in a certain data unit (data received at a certain time or data having a certain capacity). Store.

  The radio communication unit 15 extracts video and audio data from the second digital broadcast data transmitted from the radio base station and received by the antenna 13, and stores the video and audio data in a memory in a certain data unit. The wireless communication unit 15 is also used for voice communication.

  The control unit 16 compares the video and audio data received by the TV tuner unit 14 with the video and audio data received by the wireless communication unit 15 in a certain unit of data. The video and audio data received by the tuner unit 14 is supplemented with the video and audio data received by the wireless communication unit 15.

  FIG. 2 is a diagram illustrating a broadcast area of a broadcast network and a wireless area of a wireless network. An area 21 indicated by hatched circles in FIG. 2 indicates a broadcast area, and a pentagonal area 22 indicates a radio area where radio waves of a mobile phone radio base station can be transmitted and received. As shown in FIG. 2, since the wireless area of the mobile phone is set more finely than the broadcast area, a wireless signal from the wireless base station can be received even in a place where the reception state of the broadcast wave is bad.

FIG. 3 is a flowchart showing the operation of the mobile digital television receiver 11.
The TV tuner unit 14 receives the broadcast wave data of the digital television broadcast (FIG. 3, S11), and sorts and rearranges the data (S12). Broadcast wave data received from a broadcast station is separated into video, audio, and other data and stored in, for example, a video buffer, an audio buffer, and a data buffer.

  In parallel with this, the wireless communication unit 15 receives digital television broadcast data from the wireless network (S13), and sorts and rearranges the data (S14). Data received from the wireless network is also separated into video, audio and other data and stored in the video buffer, audio buffer and data buffer, respectively.

FIG. 4 is a diagram illustrating an example of a configuration of a buffer that stores broadcast wave data received from a broadcast station and data received from a wireless network.
A broadcast wave buffer 31 for storing broadcast wave data received from a broadcast station includes a video buffer 31a for storing a plurality of video data, an audio buffer 31b for storing a plurality of audio data, and a data buffer 31c for storing other data. Consists of.

  The wireless network buffer 32 for storing data (MPEG2-TTS) received from the wireless network stores a video buffer 32a for storing a plurality of video data, an audio buffer 32b for storing a plurality of audio data, and other data. A data buffer 32c.

  Video data obtained by complementing the video data of the broadcast wave video buffer 31a with the video data of the video buffer 32a of the wireless network is stored in the video buffer 31a. Similarly, audio data supplemented with audio data of the wireless network is stored in the audio buffer 31b, and other complementary data is stored in the data buffer 31c.

  Returning to FIG. 3, the broadcast wave data received from the broadcasting station and the data packet received from the wireless network are compared with each other for a certain period or for every predetermined capacity, and it is checked whether there is any missing data (S15). In the process of step S15, for example, a certain period or a certain amount of video data stored in the broadcast wave video buffer 31a is compared with a certain period or a certain amount of video data stored in the video buffer 32a of the wireless network. And check for missing video data.

If there is missing data, the broadcast wave data received from the broadcasting station is supplemented with the data received from the wireless network, and the complemented data is stored in the buffer (S16).
FIG. 5 is an explanatory diagram of data complementation. As shown in FIG. 5, video data A, B, C, E, and G are stored in the broadcast wave video buffer 31a, and video data A, B, C, D, E, and F are stored in the video buffer 32a of the wireless network. Suppose that

  The control unit 16 compares the video data of the broadcast wave video buffer 31a with the video data of the video buffer 32a of the wireless network, and the video data 31 and the video data F are missing from the data of the video buffer 31a. Is detected, the video data D and the video data F stored in the video buffer 32a of the wireless network are copied to the corresponding positions in the broadcast wave video buffer 31a.

Returning to FIG. 3, the video buffer and audio buffer data are reproduced using the complemented data (S17).
According to the embodiment described above, for example, even when coming to a place where it is difficult to receive broadcast waves while moving in a car, it is possible to supplement the broadcast wave data with digital TV broadcast data received from the wireless network. You can watch digital TV broadcasts with a certain quality.

The present invention is not limited to the embodiment described above, and may be configured as follows.
(1) The present invention is not limited to receiving digital television broadcast data from a wireless base station of a mobile phone, and data may be received from another wireless network such as a wireless LAN.

It is a figure which shows the structure of the mobile digital television receiver of embodiment. It is a figure which shows a broadcast network and a radio network. It is a flowchart which shows operation | movement of a mobile digital television receiver. It is a figure which shows the structure of a broadcast wave buffer and a radio network buffer. It is explanatory drawing of data complementation.

Explanation of symbols

11 mobile digital television receiver 12, 13 antenna 14 TV tuner unit 15 wireless communication unit 16 control unit

Claims (3)

First digital broadcast receiving means for receiving a digital television broadcast from a broadcast network;
Second digital broadcast receiving means for receiving digital television broadcast from a wireless communication network;
The first digital broadcast data received by the first digital broadcast receiving means is compared with the second digital broadcast data received by the second digital broadcast receiving means, and a missing portion is compared with the second digital broadcast data. A mobile digital television receiver comprising control means supplemented by Storing the video data and audio data of the first digital broadcast data and the second digital broadcast data in a video buffer and an audio buffer, respectively, for each fixed data unit;
The control means compares the first digital broadcast data stored in the video buffer and the audio buffer with the video and audio data of the second digital broadcast data, and identifies the missing portion as the video. The mobile digital television receiver according to claim 1, wherein the second digital broadcast data stored in the buffer and the audio buffer is supplemented with corresponding video and audio data.   3. The mobile digital television receiver according to claim 1, wherein the second digital broadcast receiving means receives an audio signal transmitted from a radio base station of a mobile phone and the second digital broadcast data.