发明名称 |
Recording and/or replaying teletext signals |
摘要 |
In order to record and replay teletext signals using a VHS video recorder the teletext data is converted into a multilevel (quarternary) code at a lower (half) data rate. On record an encoder (7) takes teletext data from a RAM (6) and encodes it as a multilevel code at a lower data rate and passes it to the normal luminance processor (10) of the VCR. On playback the multilevel code is replayed and fed to a decoder (13) which converts it to binary code at the standard teletext data rate. This is stored in the RAM (6) and then read out into a teletext decoder (14) where clock run-in and framing code are added before it is combined with the CVBS in a multiplexer (15) and passed to an output 16. <IMAGE> <IMAGE>
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申请公布号 |
EP0797354(A1) |
申请公布日期 |
1997.09.24 |
申请号 |
EP19970200686 |
申请日期 |
1997.03.07 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
JAMES, SHIRLEY JUNE |
分类号 |
H04N7/025;H04N5/91;H04N5/92;H04N7/03;H04N7/035;H04N7/088;(IPC1-7):H04N5/92;H04N7/08 |
主分类号 |
H04N7/025 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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