| 摘要 |
<p>An apparatus for the display and storage of television picture information by using a memory accessible from a computer in which the memory comprises dynamic RAM memory elements arranged in memory blocks being accessed in repetitive cycles. The address inputs of the memory elements are controlled by an address generator through an address modifying circuit and an address switching unit. The address modifying circuit modifies the picture addresses provided by the address generator corresponding to the internal address requirements of the memory blocks. The address switching unit is connected both to predetermined address lines of the address generator and to address lines of an interface providing connection towards the computer. The data bus of the memory is coupled to a data switching unit having outputs coupled to a parallel to series converter and to the multiplexer of the interface. The control of the data and address switching units is carried out by the least significant horizontal address bits. Owing to the specific kind of control a part of the memory blocks is always connected to the computer and an other part to the display unit, and these connections are cyclically interchanged. This control provides for the continuous refreshment of the dynamic RAM memories, and the apparatus will be in a quasi-continuous connection both with the display and the computer. </p> |
