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Channel switching method and device

A channel switching device and channel switching technology, applied in the field of channel switching methods and devices, capable of solving problems such as poor user experience, blurred screen or flickering screen

Active Publication Date: 2017-11-24
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present application provides a channel switching method and device. In order to avoid the phenomenon of blurred screen or flickering when digital TV is switched from other channels to DTV channels, a longer audio and video mute state duration has to be set. Poor user experience

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Embodiment Construction

[0026] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

[0027] The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term...

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Abstract

The invention provides a channel switching method and device, which are applied to a digital television. The digital television is connected with a CAM card for descrambling TV programs. The method comprises the following steps: when the digital television plays a scrambled program under a DTV channel, if detecting that the digital television is switched from the DTV channel to another channel, sending a descrambling interrupt instruction to the CAM card, wherein the descrambling interrupt instruction is used for indicating the CAM card to empty descrambling information of the scrambled program. The method can solve the problem of poor user experience caused since a longer audio / video mute state time duration has to be set to prevent the phenomenon of blurred screen or flash screen when the digital television is switched from other channels to the DTV channel.

Description

technical field [0001] The present application relates to the technical field of digital television, in particular to a channel switching method and device. Background technique [0002] CAM (Condition Access Module, conditional access card) card is a special card for digital TV with a smart card slot, also known as conditional access module or CAM, used to connect digital TV to process data sent by external signal sources stream. The basic function of the CAM card is to filter and descramble, that is, to convert the scrambled data stream sent by the external signal source into TV content, and display it on the digital TV, so that users can directly watch the ordered digital TV content without a set-top box . [0003] In the channel switching function commonly used in digital TV at present, every time the channel is switched, the digital TV needs to send a CA_PMT table to the CAM card, so as to inform the CAM card which channel data needs to be descrambled. After the CAM ...

Claims

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Application Information

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IPC IPC(8): H04N21/418H04N21/4385H04N21/438
CPCH04N21/4181H04N21/4383H04N21/43853
Inventor 汪桂兰
Owner HISENSE VISUAL TECH CO LTD
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