| 摘要 |
A method for removing the background noise during reception of weak electric field intensity signals. If the electric field intensity of television broadcast signals received by a main picture receiving section is weak, a PIP (picture in picture) function is released, and the release is displayed to notify it to the user. The electric field intensity of the received television broadcast signals is determined in accordance with the AGC signals of the television broadcast signals which are received by a main picture receiving section. If the electric field intensity is strong, the amplification gain of an LNA is adjusted to a low level, and a PIP function is executed or released, depending upon the user's selection of the PIP function. If the electric field intensity is weak, the amplification gain of an LNA is adjusted to a high level, and a determination is made as to whether the PIP function is being executed. If the PIP function is being executed, the PIP function is released, and the release is displayed in the form of an OSD (on screen display) to notify the release to the user. Therefore, in the present invention, when the electric field intensity of the television broadcast signals of the main picture receiving section is weak, the PIP picture receiving section is disabled, so that the PIP picture receiving section would not generate the spurious radiation, thereby upgrading the picture quality on the screen. |
