ON SCREEN DISPLAY APPARATUS FOR SATELLITE BROADCASTING TV RECEIVER

摘要

The on-screen display processing system includes a de-emphasis circuit for de-emphasis processing a signal received through a buffer from a tuner, a clamping circuit for clamping the output signal of the de-emphasis circuit received through a low-pass filter and an amplifier, first and second buffers for transmitting the outputs of the buffer and the de-emphasis circuit to a film net decoder and sky decoder, respectively, a first switch for selecting the output signal of the sky decoder or the film net decoder, a second switch for selecting the output signal of the first switch or the clamping circuit, an on-screen display processor for processing the output signal of the second switch, a MAC signal processor for receiving the output signal of the buffer, an encoder for encoding the output signal of the MAC signal processor, a third switch for selecting the output signal of the encoder or the on-screen display processor, a microprocessor for controlling the first to third switches, on-screen display processor and the MAC signal processor.