Ambient light filter for infrared linked stereoscopic glasses

Details Ambient light filter for infrared linked stereoscopic glasses Ambient light filter for infrared linked stereoscopic glasses

1992-07-24

1994-06-28

Chin, Tommy P.

Television

Stereoscopic

Stereoscopic display device

359194, 348 55, 348164, H04N 1304

Patent

active

053251920

ABSTRACT:
A stereoscopic imaging system (10) includes a display (14) and stereoscopic glasses (18) having right-and left-eye pieces (20 and 22). A photodetector (28) in the glasses receives electromagnetic radiation including IR pulses, having fast rise times, from a transmitter (26), and noise from ambient light and other electromagnetic radiation. An ambient light filter (34) filters out low frequency and low amplitude noise created by ambient light and other electromagnetic signals. The ambient light filter employs a high pass filter cancellation loop (42) that cancels low frequency components, a high frequency amplifier (50) that provides unity gain to low frequency components, and a high pass filter (C3 and R9). The ambient light filter also employs a threshold adjusting circuit (64) that temporarily adjusts the threshold voltage of a comparator (60) in response to reception of the IR pulses.

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