CATV terminal unit

Details CATV terminal unit CATV terminal unit

1997-07-16

1999-09-21

Faile, Andrew I.

Television

Two-way video and voice communication

User positioning

348 12, 455 62, H04N 710

Patent

active

059560754

ABSTRACT:
A level detecting device 7 detects the input level of a tuner 11 and an external unit connection terminal 15. Corresponding to the detected result, a gain controlling circuit 8 controls the attenuation amount of a variable attenuator 5 so that the input level becomes a predetermined level. Switches 3 and 14 are controlled corresponding to the power ON/OFF states. In the power OFF state, the system connection terminal 2 and the external unit connection terminal 15 are connected. An up signal that is output from an up signal generating circuit is output from the system connection terminal 2 (to a transmission cable 1) through a branching device 4 that branches the up signal and the down signal.

REFERENCES:
patent: 4924303 (1990-05-01), Brandon et al.
patent: 5414456 (1995-05-01), Oda et al.
patent: 5459507 (1995-10-01), Sakuma et al.
patent: 5483277 (1996-01-01), Granger
patent: 5488413 (1996-01-01), Elder et al.
patent: 5546119 (1996-08-01), Bestler et al.
patent: 5808702 (1998-09-01), Yoshinobu et al.
patent: 5838383 (1998-11-01), Chimoto et al.

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