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Clock generating circuit and glossary TV and broadcast data sample circuit

A technology for generating circuits and circuits, applied in electrical digital data processing, simultaneous/sequential multi-TV signal transmission, television, etc., and can solve problems such as incorrect sampling of data

Inactive Publication Date: 2006-11-01
NEC ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, incorrect sampling data may be generated

Method used

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  • Clock generating circuit and glossary TV and broadcast data sample circuit
  • Clock generating circuit and glossary TV and broadcast data sample circuit
  • Clock generating circuit and glossary TV and broadcast data sample circuit

Examples

Experimental program
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Effect test

no. 1 example

[0047] Figure 9 A circuit block diagram schematically showing the circuit structure of the teletext broadcast data sampling circuit 900 according to the first embodiment of the present invention. exist Figure 9 In , the same circuit blocks as those in FIG. 4 are denoted by the same reference numerals as those in FIG. 4 . The teletext data sampling circuit 900 of the teletext broadcast according to this embodiment includes a slice level generating circuit 904, a comparator 401, a sampling clock generating circuit 902, and a data sampling circuit 403 for generating data.

[0048] A text signal is supplied to the slice level generating circuit 904, and the slice level generating circuit 904 outputs a slice level corresponding to the text signal. The slice level and the text signal are supplied to the comparator 401 . Then the comparator 401 compares the level of the text signal with the slice level as the reference signal, and outputs the slice data of the binary signal. The ...

no. 2 example

[0077] reference below Figure 16 18 to 18 describe the second embodiment of the teletext data sampling circuit of the present invention. Figure 16 A circuit block diagram of the teletext data sampling circuit of the second embodiment is shown. Basic structure and reference Figure 10 The first embodiment described is the same.

[0078] Apart from Figure 10 In addition to the structure, the maximum and minimum value difference detection circuit 1607, error detection circuit 1608, data holding circuit 1609 and selector are added. Circuit blocks other than those described above will not be described here since they are already covered by the first embodiment. The maximum and minimum value difference detection circuit 1607 detects the difference between the maximum value and the minimum value in the output pulse timings of the maximum value detection circuit 1001 and the minimum value detection circuit 1002 . The error detection circuit 1608 detects errors in the output co...

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PUM

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Abstract

In an embodiment of the present invention, a maximum value detection circuit and a minimum value detection circuit respectively detects maximum value peaks and minimum value peaks in which CRI included in a text signal of teletext broadcasting indicates '1' or '0'. A reference timing generation circuit calculates a reference timing using the maximum and minimum value peak so as to identify a phase of a sampling clock. The reference timing is a start timing of the sampling clock. Further, a pulse generator generates a sampling clock using a pre-registered cycle with the sampling clock reference timing as a reference.

Description

technical field [0001] The invention relates to a sampling clock generation circuit and a teletext broadcast data sampling circuit suitable for a teletext broadcast data receiving circuit of television video signals. Background technique [0002] Teletext broadcasts are transmitted by superimposing on radio waves information in the form of digital signals, such as still images including text and simple graphics. The receiver stores the digital signal in a memory or the like, and then converts the digital signal into a TV video signal for display on the TV receiver. The system used to transmit text and graphics in data form as well as television broadcasts is known internationally as teletext. [0003] As shown in FIG. 1, a signal of a teletext broadcast (hereinafter referred to as a text signal) is superimposed in a vertical blanking interval of a television video signal and exists after a colorburst signal. The binary NRZ code is used for the transmission code of the text...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/06G06F13/00H04N7/087H04N7/24
CPCH04N7/035H04N7/0882H04N7/08
Inventor 山下兼司
Owner NEC ELECTRONICS CORP