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Digital broadcast reception device, and channel changing method

A digital broadcasting and receiving device technology, applied in the direction of image communication, selective content distribution, electrical components, etc., can solve problems such as inability to decode, achieve reliable channel switching processing, and shorten the effect of video non-display period

Inactive Publication Date: 2012-08-08
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the MPEG2 system, an I picture contains all its own information, so it can be decoded by itself. However, a P picture and a B picture are only differential information, so they cannot be decoded without a predictive image.

Method used

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  • Digital broadcast reception device, and channel changing method
  • Digital broadcast reception device, and channel changing method
  • Digital broadcast reception device, and channel changing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] figure 1 It is a schematic block diagram showing the configuration of the digital broadcast receiving device 100 according to Embodiment 1 of the present invention. As shown in the figure, the digital broadcast receiving device 100 has an antenna 101, a tuner unit 102, a separation unit 103, an MPEG video decoding unit 104, a display unit 105, an MPEG audio decoding unit 106, a speaker unit 107, an operation unit 108, and a key receiving unit 109. , a flash memory 110 , a RAM (Random Access Memory) 120 , and a control unit 130 .

[0058] Antenna 101 receives digital broadcast signals, and supplies the received digital broadcast signals to tuner unit 102 .

[0059] The tuner unit 102 demodulates the digital broadcast signal received by the antenna 101 to generate a transport stream (hereinafter referred to as TS), and supplies the generated TS to the separation unit 103 .

[0060] The separation unit 103 separates the TS received by the tuner unit 102 to obtain video p...

Embodiment approach 2

[0130] Next, Embodiment 2 in the present invention will be described. In Embodiment 2, the information stored in the second tuning control information table 121 a is updated using TSs of channels other than the channel the user is viewing.

[0131] Figure 8 It is a schematic block diagram showing the configuration of the digital broadcast receiving device 200 according to the second embodiment. As shown in the figure, the digital broadcast receiving device 200 has an antenna 101, a tuner unit 102, a separation unit 103, an MPEG video decoding unit 104, a display unit 105, an MPEG audio decoding unit 106, a speaker unit 107, an operation unit 108, and a key receiving unit 109. , flash memory 110, RAM 120, control unit 230, auxiliary tuning unit 260, and buffer unit 261. Compared with Embodiment 1, the control unit 230, auxiliary tuning unit 260, and buffer unit 261 are different. Items are explained.

[0132] The auxiliary tuner unit 260 demodulates the digital broadcast si...

Embodiment approach 3

[0162] Next, Embodiment 3 in the present invention will be described. In Embodiment 3, similarly to Embodiment 2, the information stored in the second tuning control information table 121a is updated using TSs obtained for channels other than the channel the user is viewing. However, in Embodiment 3, the information stored in the second tuning control information table 121a is updated with respect to the channel starting a new program using the program time information.

[0163] Figure 11 It is a schematic block diagram showing the configuration of the digital broadcast receiving device 300 according to the third embodiment. As shown in the figure, the digital broadcast receiving device 300 has an antenna 101, a tuner unit 102, a separation unit 103, an MPEG video decoding unit 104, a display unit 105, an MPEG audio decoding unit 106, a speaker unit 107, an operation unit 108, and a key reception unit 109. , flash memory 110 , RAM 320 , control unit 330 , sub-tuner unit 260...

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Abstract

The present invention reliably initiates channel switchover and reduces periods wherein an image is not displayed. A digital broadcast reception device is provided with: RAM (120) for storing second channel selection control information for each channel, said second channel selection control information having an I-picture appearan d, and an I-picture appearance interval, which is the interval between times when packets containing an I-picture are obtained; and a control unit (130) which receives input from an operation unit (108) for a channel selection change, and then acquires, from the selection control information, the I-picture appearance time and the I-picture appearance interval corresponding to the channel after the change, and calculates an I-picture appearance prediction time in which the next packet containing an I-picture will be obtained by adding the I-picture appearance interval to the I-picture appearance time, and delays the changing of the channel until a time required for changing to the selected channel that is before the I-picture appearance prediction time.

Description

technical field [0001] The present invention relates to techniques for changing channels in digital broadcasting. Background technique [0002] In digital broadcasting, the MPEG (Moving Picture Experts Group) 2 method is used as an encoding method for video data. In MPEG2 encoding, video data is divided into three types of data: I picture, P picture, and B picture, and these data are grouped in units such as GOP (Group Of Picture). [0003] The I picture is generated by directly compressing the image of one frame. The compression rate is low, but the precision is high. The P picture is generated based on the prediction (forward prediction) of the past I picture and P picture. Compared with the I picture, the compression High rate, same precision, B picture is generated based on past and future I picture and P picture prediction (bi-directional prediction), compared with P picture, high compression rate, same precision. [0004] In the MPEG2 system, since an I picture conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/426H04N21/438
CPCH04N21/4331H04N21/44004H04N21/4384H04N21/4345
Inventor 松浦大树德山悟汤川纯三木智子上田健介
Owner MITSUBISHI ELECTRIC CORP
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