Patent ID: 7571491
Filing Date: 2009-08-04
Classification: G06F,H04N

Abstract:
1. A tamper-detecting television receiver, comprising: a casing comprising a casing cover and a casing body, a video input within said casing for receiving an encrypted digital or analog video signal, a decoding circuit within said casing for decrypting such encrypted video signal, a video display unit inside the casing, for displaying an image corresponding to said decrypted video signal, a cover opening/closing detector for detecting an open or closed state of the casing cover; and a switch for controlling a power supply voltage that is applied to the decoding circuit, in accordance with an output of the cover opening/closing detector; wherein power is supplied to the decoding circuit through the switch when the output of the cover opening/closing detector indicates that the casing cover is closed, and the supply of power to the decoding circuit is cut off by the switch when the output of the cover opening/closing detector indicates that the casing cover is opened, and said cover opening/closing detector comprises: