JPS5828477U

JPS5828477U - teletext receiver

Info

Publication number: JPS5828477U
Application number: JP1981121927U
Authority: JP
Inventors: 米井　博
Original assignee: 三洋電機株式会社
Priority date: 1981-08-17
Filing date: 1981-08-17
Publication date: 1983-02-24

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は文字多重信号の一例を示す図解図である。第２
図は伝送路の群遅延特性によって生じる文字放送信号の
波形歪を示す図である。第３図はこの考案の一実施例を
示すブロック図である。第４図は第３図の回路の各部の
疲形図である。図において、２はＡＤ変換器、３および４はラッチ回路
、６は遅相回路、７は進相回路、８は切替回路、９はデ
ータスライス回路、１０はサンプリングロック再生回路
、１１はカウンタ、１２はラッチパルス発生回路、１３
は比較回路を示す。FIG. 1 is an illustrative diagram showing an example of a character multiplex signal. Second
The figure is a diagram showing waveform distortion of a teletext signal caused by group delay characteristics of a transmission path. FIG. 3 is a block diagram showing an embodiment of this invention. FIG. 4 is a fatigue diagram of each part of the circuit shown in FIG. 3. In the figure, 2 is an AD converter, 3 and 4 are latch circuits, 6 is a phase delay circuit, 7 is a phase advance circuit, 8 is a switching circuit, 9 is a data slice circuit, 10 is a sampling lock regeneration circuit, 11 is a counter, 12 is a latch pulse generation circuit, 13
indicates a comparison circuit.

Claims

[Scope of utility model registration request]

(1) In a teletext receiver that receives teletext data that is transmitted within a vertical blanking period and includes a framing code, reception of the start bit in a portion of the framing code in which the first level continues. A teletext receiver, comprising: a level comparing means for comparing a signal level with a received signal level of a terminal bit; and a waveform distortion correcting means for correcting waveform distortion of the received signal based on a comparison result of the level comparing means.

(2) The waveform distortion correction means includes: When the level comparing means detects that the received signal level of the starting bit is higher than the receiving signal level of the ending bit, phase delaying means causes the phase of the received teletext data to be sent by a predetermined amount; and the starting edge. registration of a utility model, comprising: a phase advancing means for advancing the phase of the received teletext data by a predetermined amount when the level comparing means detects that the received signal level of the bit is lower than the received signal level of the terminal bit; A teletext receiver according to claim 1.

(3) The level comparison means is an A/D converter for A/D converting the received teletext data.
conversion means; a first latch means for latching the output of the start bit among the outputs of the A/D conversion means; and a second latch means for latching the output of the last bit among the outputs of the A/D conversion means. A teletext receiver according to claim 1 or 2, which includes a latch means and a comparison means for comparing the outputs of the first and second latch means.