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Digital broadcast receiver and digital broadcast receiving method

A digital broadcasting and receiving device technology, applied in the field of digital broadcasting receiving devices and digital broadcasting receiving, digital broadcasting receiving devices, can solve problems such as hard to expect effects, increased hardware cost, no effect, etc., to shorten delay time and suppress costs Increased effect

Inactive Publication Date: 2011-03-16
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, there is a problem that if the number of tuners equal to the number of channels that can be received in advance is not provided, the channel to be selected by the viewer next is different from the predicted channel, or the viewer frequently performs channel switching by so-called channel switching. when, no effect
[0015] In addition, in order to have multiple tuners and decoders, the cost of hardware required increases, making it difficult to apply to general products
[0016] In addition, although the method described in the above-mentioned Patent Document 2 can reduce the time spent on receiving PSI by predicting PSI, the data volume of PSI accounts for a small proportion in TS (Transport Stream), and the processing time occupied in the whole The time is short, and it is difficult to expect a significant effect
In addition, there is also the problem that there is no effect when the prediction is wrong

Method used

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  • Digital broadcast receiver and digital broadcast receiving method
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  • Digital broadcast receiver and digital broadcast receiving method

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no. 1 approach

[0067] First, use figure 1 The configuration of the digital broadcast receiving device according to the first embodiment of the present invention will be described.

[0068] figure 1 It is a configuration diagram of the digital broadcast receiving device according to the first embodiment of the present invention.

[0069] Such as figure 1 As shown, the digital broadcast receiving device of this embodiment includes a TS receiving unit 101, a TS separating unit 102, a video stream buffer memory 103, a video decoder 104, a video display unit 105, an audio stream buffer memory 106, an audio decoder 107, and an audio stream buffer memory 106. The output unit 108, the display / output timing control unit 109, and the initial delay determination unit 110 are constituted.

[0070] The TS reception unit 101 performs reception processing corresponding to the transmission medium, and outputs an MPEG transport stream. For example, when terrestrial digital broadcasting is received, broad...

Embodiment approach 2

[0089] Below, use Figure 6 as well as Figure 7 A second embodiment of the present invention will be described.

[0090] In the first embodiment, when the initial delay time is shortened, in order not to cause an underflow, a method of gradually recovering the playback speed by slow playback with sound is employed.

[0091] In the present embodiment, when the initial delay time is shortened, in order not to cause an underflow, a scene without motion and sound is detected, and repeated reproduction is performed at this portion, thereby preventing the data on the buffer memory from being exhausted.

[0092] First, use Figure 7 The configuration of a digital broadcast receiving device according to a second embodiment of the present invention will be described.

[0093] Figure 7 It is a configuration diagram of a digital broadcast receiving device according to a second embodiment of the present invention.

[0094] The digital broadcast receiving device of this embodiment i...

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Abstract

A digital broadcast receiver offering lower costs, capable of shortening the delay time required for the video display while receiving the digital broadcast, and further causing the viewer no abnormal viewing sensations. The digital broadcast receiver demultiplexes the video and audio elementary stream and time information from the transport stream, then monitors the buffer capacity during buffering of the video and audio elementary streams, and retains the statistical information. The digital broadcast receiver then checks the statistical information, and sets the play delay time for the decoded video frames and decoded audio frames from the beginning of the elementary stream. After starting the display, operation is in slow-motion-play-with-audio until the display time for a particular frame returns to the original value and the stream buffer capacity is restored. The digital broadcast receiver might instead analyze the video frame and the audio frame, and repeatedly play frames in scenes with no video movement and also scenes with no sound.

Description

technical field [0001] The present invention relates to a digital broadcast receiving device and a digital broadcast receiving method, and more particularly to a digital broadcast receiving device and a digital broadcast receiving method suitable for shortening the delay time until display when a digital television transmission signal is received, decoded and displayed. Background technique [0002] In recent years, the digitization of television broadcasting has continued to advance. [0003] Compared with conventional analog broadcasting, digital broadcasting has the characteristics of higher video and audio quality and higher transmission efficiency. [0004] Therefore, in addition to existing broadcast media such as satellite waves, terrestrial waves, and cable television, the spread of digital broadcasting in new media such as IP networks is also expected. [0005] On the other hand, several problems unique to digital broadcasting are known, and as one of the problems,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/434H04N21/4405H04N5/44H04N7/173H04N21/4385H04N21/44H04N21/442
CPCH04N21/44008H04N5/4401H04N5/50H04N21/44004H04N21/434H04N21/4384H04N21/23406H04N21/426
Inventor 藤平达
Owner HITACHI LTD
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