Shutter-glass eyewear communications receiver
View Patent ↗Shuttering eyewear used to view 3D imagery and/or dual-view images may utilize an IR receiver filter with moderate to wide bandwidth to pass data sidebands of an on-off keying signal while strongly rejecting nearby interference sources. Filtering of the signal may be achieved via a circuit for passing data sidebands of infrared signals. The circuit may include a band pass filter with a low value of Q operable to filter out a first type of interference signal from a signal, a plurality of mixers operable to receive the signal from the band pass filter, wherein the plurality of mixers down converts the signal to baseband signals, and a plurality of low pass filters operable to receive the baseband signals from the plurality of mixers, wherein the plurality of low pass filters rejects a second type of interference.
1. Stereoscopic eyewear for receiving infrared signals, comprising:
a first lens and a second lens, each of the first and second lens comprising a liquid crystal shutter;
a circuit for passing data sidebands of infrared signals comprising:
a band pass filter with a low value of Q operable to generate a filtered signal by filtering out a first type of interference from a received infrared signal,
a plurality of mixers operable to receive the filtered signal from the band pass filter, wherein the plurality of mixers down converts the filtered signal to baseband signals, and
a plurality of low pass filters operable to receive the baseband signals from the plurality of mixers, wherein the plurality of low pass filters rejects a second type of interference; and
a frame for holding the first lens, the second lens, and the circuit for passing data sidebands of the infrared signals.
2. The stereoscopic eyewear of claim 1 , wherein the first type of interference is a high frequency interference signal.
3. The stereoscopic eyewear of claim 1 , further comprising an amplifier operable to adjust gain and further operable to communicate with the band pass filter.
4. The stereoscopic eyewear of claim 3 , further comprising a pre-amplifier operable to convert current pulses to a voltage and further operable to communicate with the amplifier.
5. The stereoscopic eyewear of claim 4 , further comprising a photodiode operable to convert light pulses to current pulses and further operable to communicate with the pre-amplifier.
6. The stereoscopic eyewear of claim 5 , further comprising an AGC block operable to control the amplifier gain to stabilize the filtered signal level at the output of the band pass filter.
7. The stereoscopic eyewear of claim 5 , further comprising a magnitude detector operable to communicate with the plurality of low pass filters.
8. The stereoscopic eyewear of claim 1 , wherein the second type of interference is a near-carrier interference signal.
9. The stereoscopic eyewear of claim 1 , wherein the band pass filter is a single resonator band pass filter.
10. The stereoscopic eyewear of claim 1 , wherein the band pass filter is a low Q band pass filter.