Apparatus using a light sensing system for sensing time modulated information from a light emitting device
First Claim
1. An electronic control or data transfer system, comprising:
- an electronic light emitting device;
means for selectively time modulating the light intensity at one or more selected regions of said light emitting device;
a manipulable electronic light sensor adapted to be selectively placed at a fixed position in front of said one or more selected regions of said electronic light emitting device; and
means connected to said light sensor for detecting the time modulation in the sensor output to form a pulse train of time sequential coded information identified with said time modulated light intensity of said selected region of said light emitting device.
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Accused Products
Abstract
An electronic control system for a television receiver (12) incorporates a light pen (10) which can be applied to selected portions (16) of the screen (14). These portions (16) are modulated (FIG. 2) at the field scan rate by data inputs such that in successive television fields they are black or white in accordance with the values 1 or 0 of the bits of the data. The data can be used to pre-program the receiver, or alternatively simply stored or printed. The light pen can also be used to read bar codes (36) in a broadcasting periodical (38), and to distinguish whether the light pen is reading the CRT or a bar code a differentiator (42) and asymmetry detector (44) sense whether the light pen output pulses have sharp or decaying trailing edges. In an alternative arrangement the light pen can be used with a light emitting diode such as on a radio receiver or a telephone.
388 Citations
12 Claims
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1. An electronic control or data transfer system, comprising:
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an electronic light emitting device; means for selectively time modulating the light intensity at one or more selected regions of said light emitting device; a manipulable electronic light sensor adapted to be selectively placed at a fixed position in front of said one or more selected regions of said electronic light emitting device; and means connected to said light sensor for detecting the time modulation in the sensor output to form a pulse train of time sequential coded information identified with said time modulated light intensity of said selected region of said light emitting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
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9. An electronic control or data transfer system comprising:
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a manipulable electronic light sensor for selectively sensing either a bar code or the output of a digitally modulated light emitting device; and electronic means connected to said light sensor and responsive to the output thereof for distinguishing a sensor output which has been derived from a bar code from a sensor output which has been derived from a digitally modulated light emitting device. - View Dependent Claims (10, 11)
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Specification