Method for detecting compatibility of CI card interface and CA card

Abstract

The invention relates to a method for detecting compatibility of a CI card interface and a CA card. The method for detecting the compatibility of the CI card interface and the CA card comprises the following steps of: a, providing a card sleeve which is matched with the CI card interface and is used for inserting the CI card; b, through the card sleeve in a CI card interface circuit, judging whether the card sleeve is detected by detecting whether the electrical level of a pin is changed after the pin is unoccupied and inserted into the card sleeve; c, providing voltage for the CA card in the card sleeve after determining that the card sleeve is detected; d, inserting the CA card into the card sleeve, and judging whether the CA card is detected by detecting whether the electrical level of the pin corresponding to the CA card in the CI card interface circuit is changed. By the method, whether the CI card (a big card) interface is compatible with the CA card (a small card) can be effectively detected, so that equipment such as a digital television and a set top box can use the big card (CI card) and also can use the small card (CA card), and popularization of big card products can be facilitated; and by the method, necessary conditions and guarantee are provided for normal working of digital television receiving equipment.

Description

technical field [0001] The invention relates to a method for detecting the compatibility of different signals in a digital television, specifically a method for detecting that a CI (Common Interface) card interface is compatible with a CA (Condition Access) card. Background technique [0002] In the equipment application of the radio and television system, in order to adapt to the different conditions of the CA (Condition Access) system in various parts of China, the digital TV receiving equipment proposes a machine-card separation scheme based on the CI (Common Interface) interface. The machine-card separation scheme of the CI interface is to redefine the pins based on the PCMCIA physical interface, to control the output and input of the TS (Transport Stream) stream, and to perform descrambling in the big card (CI card). The disadvantage of this is the higher cost of large cards. [0003] The cost of large cards directly increases the system cost, which is a relatively lar...

AI Technical Summary

Problems solved by technology

The disadvantage of this is that the cost of large cards is higher

[0003] The cost of large cards directly increases the cost of the system, which is a large expense for broadcasting and TV suppliers and consumers, which seriously restricts the promotion of large card products

But now there is no system that can be compatible with big cards and small cards (CA cards) at the same time, that is, there is no system that can satisfy the use of big cards (CI cards) and small cards (CA cards) at the same time