Circuit arrangement for indicating ambient light conditions of a

Details Circuit arrangement for indicating ambient light conditions of a Circuit arrangement for indicating ambient light conditions of a

1996-03-01

1998-03-31

Peng, John K.

Television

Image signal processing circuitry specific to television

Display controlled by ambient light

348 14, 348563, H04N 5445

Patent

active

057344396

ABSTRACT:
Users of video telephones or multimedia terminals cannot determine whether ambient light conditions during a transmission to another terminal are always of good quality. Provision is made for an indication regarding the ambient light conditions during a telephone call, and control thereof. By means of a circuit arrangement including a photocell (F) to detect incident light, a signal (II) is formed, which corresponds to the ambient light conditions. The signal (II) is displayed together with a video signal (I), or is used for control purposes.

REFERENCES:
patent: 3778811 (1973-12-01), Gicca et al.
patent: 4258387 (1981-03-01), Lemelson et al.
patent: 4355334 (1982-10-01), Fitzgibbon et al.
patent: 4514727 (1985-04-01), Van Antwerp
patent: 4821307 (1989-04-01), Flint, III
patent: 5057744 (1991-10-01), Barbier et al.
patent: 5111498 (1992-05-01), Guichard et al.
"Many a sight becomes the most cherished moment" from Prospect: in; Telcom, Feb. 1994 in German--Bildtelefon Zitel. Da wird mancher Anruf zum Schonsten Augenblick.
Patent Abstract of Japan, vol. 016, No. 469 (E-1271), 29 Sep. 1992 & JP-A-04 167679 (Sony Corp), 15 Jun. 1992.
Patent Abstracts of Japan, vol. 004, No. 097 (E-018), 12 Jul. 1980 & JP-A-55 060392 (Hitachi Ltd), 7 May 1980.

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