发明名称 |
AGC DEVICE FOR SCRAMBLE SIGNAL |
摘要 |
PURPOSE:To realize the AGC immune to the fluctuation of the sender side while avoiding the AGC from being followed to an irregular video signal even when the irregular video signal is received due to the fluctuation in the sender side. CONSTITUTION:A scramble signal (base band) e after demodulation in the 6dB mode is inputted to an input terminal 11 and the scramble signal (e) is subjected to AM modulation (negative modulation) by a modulator 12. The output (d) of the modulator is descrambled by a high frequency amplifier 13 in a form of the modulation signal. Thus, the synchronization portion of an amplifier output (g) is amplified and restored to its regular position. Then the amplifier output (g) is AM-detected by a detector 14 and a DC voltage of a SYNC top of the synchronization portion in the detector output (h) is fed back to a demodulation section as an AGC signal. |
申请公布号 |
JPH04351086(A) |
申请公布日期 |
1992.12.04 |
申请号 |
JP19910124138 |
申请日期 |
1991.05.29 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
WAKABAYASHI SHUNICHI |
分类号 |
H04N5/52;H04N7/16;H04N7/171 |
主分类号 |
H04N5/52 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|