Abstract: A system (10) for transferring digital data from one data bank to another. The system (10) is designed especially for transmitting audio/video signals in digital format from a central processing center (16) to a plurality of cable networks for viewing either instantaneously or in the future. The system (10) incorporates four processing units: a central processing unit (16), a transmission processing unit (18), a receiving processing unit (20), and a master processing unit (22). The central processing unit (16) includes a scripter computer (24) for receiving a video signal (26), converting it to a digital signal (30), and storing the digital signal (30). The transmission processing unit (18) includes a transmission computer (34) and associated transmission hardware (36). The transmission computer (34) will attach a checksum to the end of each packet of information to be sent, along with any other identifying and scheduling information related to that particular file.

Abstract: The invention relates to a sinusoidal subcarrier phase shifter for a television color generator. In accordance with the invention, the sinusoidal subcarrier is first converted to a corresponding rectangular wave. The pulse width of the rectangular wave is then varied in accordance with a signal of varying amplitude, the amplitude of the signal corresponding with the desired phase shift. The pulse width is varied by an arrangement consisting of interconnected one shot multivibrators and operational amplifiers. The rectangular wave form is then converted to a square wave, and the square wave is, in turn, converted to a phase shifted sinusoidal wave. The phase shifter for a PAL system consists of two channels, one of the channels producing one of the PAL phases and the other channel producing the complementary PAL phase.