Abstract:
A method for informing a user of the rotation of a dish in a Digital Video Broadcasting-Satellite system includes determining the duration of the rotation of the dish according to the angular velocity of the dish and the angle of the rotation; and outputting the duration of the rotation of the dish.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a method displaying the movement of a dish, and more particularly, to a method displaying the movement of a dish in a DVB-S system (Digital Video Broadcasting-Satellite, DVB-S). 
         [0003]    2. Description of the Prior Art 
         [0004]    Please refer to  FIG. 1 .  FIG. 1  is a diagram illustrating a DVB-S system  100 . As shown in  FIG. 1 , the DVB-S system  100  comprises two satellites A and B, a dish  110 , Set Top Box (STB)  120 , and a TV  130 . The dish  110  can be fixed and moveable. The dish  110  in  FIG. 1  is moveable. When the dish  110  is aligned to the satellite A, the dish  110  receives the signals from satellite A, and displays the received signals from satellite A (for example, programs) on the TV  130  through the STB  120 . Similarly, when the dish  110  is aligned with satellite B, the dish  110  receives the signals from satellite B, and displays the received signals from satellite B (for example, programs) on the TV  130  through the STB  120 . If the user wants to watch programs from satellite B when the user is watching programs from the satellite A, the STB  120  turns the dish  110  from the position aligning with satellite A to the position aligning with the satellite B. 
         [0005]    Conventionally, when the dish  110  is moving, the TV  130  displays an information “The dish is moving” to notify the user that the dish  110  is moving. 
         [0006]    However, in a conventional system, the user only knows the dish is moving and does not know how long the dish has to move, and what from and to positions the dish moves. These details are not provided, causing inconvenience. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention provides a display method for a dish of a Digital Video Broadcasting Satellite (DVB-S). The display method comprises generating a first period of time of the dish spends rotating according to an angle the dish will be rotated and an angular velocity of the dish, and outputting the first period of time. 
         [0008]    These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a diagram illustrating a DVB-S system. 
           [0010]      FIG. 2  is a flowchart illustrating the method for operating the dish of the DVB-S system of the present invention. 
           [0011]      FIG. 3  is a diagram illustrating the message informing of the rotation of the dish of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0012]    Please refer to  FIG. 2 .  FIG. 2  is a flowchart illustrating the method for operating the dish of the DVB-S system of the present invention. The steps are described as follows: 
         [0013]    Step  201 : Start; 
         [0014]    Step  202 : Detect the angular velocity of the rotation of the dish; 
         [0015]    Step  203 : Set the angular velocity of the rotation of the dish; 
         [0016]    Step  204 : Receive satellite demand from the user; 
         [0017]    Step  205 : Read the longitudes and the latitudes of the demanded satellite saved in the data base; 
         [0018]    Step  206 : Determine if the dish has to be rotated; 
         [0019]    Step  207 : Display a message informing the user of the rotation of the dish; 
         [0020]    Step  208 : Determine if the dish is rotated to the right angle; 
         [0021]    Step  209 : Close the message; 
         [0022]    Step  210 : End. 
         [0023]    In an embodiment of the present invention, when the STB  120  is reset, the angular velocity of the dish has also to be reset. The method to reset the velocity of the dish can be: 1) determine the angular velocity of the dish as described in step  202 , or  2 ) the user inputs the angular velocity of the dish as described in the step  203 . The method of detecting angular velocity of the dish can be: 1) choose any two satellites A and B of which locational data are saved in the database of the STB  120 ,  2 ) rotate the dish  110  from the angle aligning with satellite A to the angle aligning with satellite B, and 3) calculate the period of the rotation of the dish  110  from satellite A to satellite B. Thus, the angular velocity of the dish  110  is determined. 
         [0024]    When receiving the satellite demand (for example, satellite C), the STB  120  determines if the dish  110  has to be rotated to align with satellite C. If yes, the STB  120  displays a message informing the user of the rotation of the dish until the dish  110  actually rotates to the angle aligning with satellite C. The method for determining if the dish  110  actually rotates to the angle aligning with satellite C is to detect the signals transmitted from satellite C. 
         [0025]    Please refer to  FIG. 3 .  FIG. 3  is a diagram illustrating the message informing the user of the rotation of the dish according to the present invention. The present invention determines the time the dish has to spend rotating to the right angle according to the angular velocity of the dish and the angle difference between two satellites, and then displays the time on the TV screen, or alternatively outputting the information through an audio device or both on a display and via the audio device. In this way, the user is informed and knows how long he or she has to wait for programs of the satellite C to become available. As shown in  FIG. 3 , the example time to wait is 30 seconds, although obviously this figure may vary according to actual conditions. Additionally, the present invention also displays the angle difference between the two satellites on the TV screen as shown in  FIG. 3 . At first, the user watches the programs of satellite A, and then wants to watch the programs of satellite B. Thus, the dish  110  has to rotate from the angle aligning with satellite A to the angle aligning with satellite B (30 degrees as shown in  FIG. 3 , but varies according to actual conditions). Therefore, the present invention provides more detailed information to users. 
         [0026]    Additionally, the present invention also informs the situation of the dish by audio device, which further raises the convenience of the present invention. 
         [0027]    Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention.