KR970029557A - Method and device for data fetch of broadcasting reservation system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data fetching method and apparatus for a broadcast reservation system. In particular, a fetch clock (FETch ClocK; FETCK) is applied to a clock-run-in signal (CRI) carried in a broadcast reservation data (KBPS DATA SIGNAL). The present invention relates to a data fetching method and apparatus for broadcasting reservation system for fetching stable data by phase synchronization.

The apparatus of the present invention recognizes the phase speed of the fetch clock by inputting the fetch clock output from the fetch clock generator, the broadcast reservation data passing through the slicer, and the phase synchronization signal (PLI), according to the phase state of the fetch clock. A phase synchronization controller configured to generate a fetch clock selection signal CKSEL; A fetch clock generator for generating a phase-locked fetch clock according to a predetermined control signal RSI by inputting the fetch clock selection signal CKSEL generated by the phase synchronization controller and the broadcast reservation data passed through the slicer. ; A data fetch unit for inputting broadcast reservation data passing through a fetch clock generated by the fetch clock generator and a slicer, and fetching data in accordance with the data start signal SBC; And a control signal generator for inputting a vertical synchronization signal to generate the phase synchronization signal PLI, the control signal RSI, and a start signal SBC of broadcast reservation data.

Accordingly, the present invention has an effect of reliably fetching data by digitally synchronizing a fetch clock (FETCK ClocK; FETCK) to a clock-run-in signal carried in KBPS DATA SIGNAL.

Description

Method and device for data fetch of broadcasting reservation system

As this is a public information case, the full text was not included.

FIG. 1A is a timing diagram of a vertical blanking period of an odd field of a composite video signal. FIG.

FIG. 1B is a diagram showing a data signal of a Korean broadcast reservation system loaded on 16 lines of a VBI radix field of a composite video signal. FIG.

2 is a block diagram of a data fetching apparatus for a broadcast reservation system according to the present invention.

3 is an operational waveform diagram in each block diagram shown in FIG.

Claims (5)

A first step of inputting a vertical synchronization signal to generate a phase synchronization signal PLI, a start signal SBC of broadcast reservation data, and an overall system control signal; A second step of recognizing the phase speed of the fetch clock by inputting the broadcast reservation data passed through the slicer and the fetch clock, and generating a fetch clock selection signal CKSEL according to the phase state of the fetch clock between phase driving mechanisms; A third step of generating a phase locked fetch clock according to a predetermined control signal by inputting the fetch clock selection signal CKSEL generated in the second step and the broadcast reservation data passing through the slicer; And a fourth step of inputting the broadcast reservation data passed through the FETCK and the slicer generated in the third step, and fetching data in accordance with the data start signal (SBC). . After the fetch clock output from the fetch clock generator, the broadcast reservation data passing through the slicer, and the phase synchronization signal PLI are inputted to recognize the phase speed of the fetch clock, the fetch clock selection signal according to the phase state of the fetch clock ( A phase synchronization controller for generating CKSEL; Fetch clock generation for generating a phase-locked fetch clock according to a predetermined control signal (RSI) by inputting the fetch clock selection signal CKSEL generated by the phase synchronization controller and the broadcast reservation data passed through the slicer. part; A data fetch unit for inputting broadcast reservation data passing through a fetch clock generated by the fetch clock generator and a slicer, and fetching data according to a data start signal SBC; And a control signal generator for inputting a vertical synchronization signal to generate the phase synchronization signal (PLI), the control signal (RSI), and the start signal (SBC) of the broadcast reservation data. The encoder of claim 2, wherein the control signal generator comprises a 9-bit counter that counts a system clock by inputting a vertical synchronization signal, and a logic gate and flip-flop that generates a control signal by inputting an output signal of the 9-bit counter. Data fetch device of a broadcast reservation system comprising a. The apparatus of claim 2, wherein the phase synchronization controller is configured to input a broadcast reservation data and a fetch clock output from the fetch clock generator to recognize a phase of the fetch clock, and to output the signal from the control signal generator. And a 5-bit up / down counter for generating a fetch clock selection signal in accordance with a phase synchronization signal (PLI) and a signal output from the fetch clock phase error detector. The system of claim 2, wherein the fetch clock generator is configured to input a broadcast reservation data and a control signal (RSI) output from the control signal generator to generate a clear signal, and to generate a system clock according to a signal output from the encoder. And a 32-bit delay unit for delaying the output of the 5-bit counter according to the fetch clock select signal (CKSEL) outputted from the phase synchronization controller. ※ Note: The disclosure is based on the initial application.