EP0013634A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electronic control or data transfer system with a two-dimensional display, e.g. a cathode ray tube
Assignee: British Broadcasting Corp
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Filing: 1980-01-15
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Granted: —
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Expires: 2000-01-15
Abstract
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.
Inventors
- 👤 George Dewar Monteath
- 👤 Arthur Howard Jones
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 18:28
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10881; G04; G04G; G04G15/00; G04G15/006; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/12; G05B19/124; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G05B2219/00; G05B2219/20; G05B2219/23; G05B2219/23363
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
An electronic control or data transfer system, comprising an electronic light emitting device, a manipulable electronic light sensor adapted selectively to be placed in front of the electronic light emitting device for control or data transfer purposes, means for modulating the light emitting device, and means connected to the light sensor for detecting the modulation in the sensor output to form a pulse train.
Claim 2
Dependent Claim
64 words
An electronic control or data transfer system, comprising an electronic light emitting device, a manipulable electronic light sensor adapted selectively to be placed in front of the electronic light emitting device for control or data transfer purposes, means for modulating the light emitting device, and means connected to the light sensor for detecting the modulation in the sensor output to form a pulse train.
Claim 3
Dependent Claim
29 words
A system according to claim 1, in which the light emitting device comprises a cathode ray tube which is modulated at a rate related to the field scanning rate.
Claim 4
Dependent Claim
30 words
A system according to claim 2, in which the pulse train is applied to means for controlling the operation of the apparatus of which the cathode.ray tube is a part.
Claim 5
Dependent Claim
20 words
A system according to claim 2 or 3, in which the cathode ray tube is part of a television receiver.
Claim 6
Independent Claim
20 words
A system according to any preceding claim, in which the modulating means modulates the light emitting device with digital data.
Claim 7
Independent Claim
17 words
A system according to any preceding claim, in which the detecting means comprises a pulse shaping circuit.
Claim 8
Independent Claim
20 words
A system according to any preceding claim, including an electronic storage device connected to the output of the light sensor.
Claim 9
Independent Claim
44 words
A system according to any preceding claim, in which the detecting means comprises electronic means adapted to distinguish by means of the sensor output a sensor output derived from a bar code from a sensor output derived from a digitally modulated light emitting device.
Claim 10
Dependent Claim
72 words
An electronic control or data transfer system comprising a manipulable electronic light sensor capable of sensing selectively either a bar code or the output of a digitally modulated light emitting device, and electronic means connected to the output of the light sensor and adapted to distinguish by means of the sensor output a sensor output derived from a bar code from a sensor output derived from a digitally modulated light emitting device.
Claim 11
Dependent Claim
72 words
An electronic control or data transfer system comprising a manipulable electronic light sensor capable of sensing selectively either a bar code or the output of a digitally modulated light emitting device, and electronic means connected to the output of the light sensor and adapted to distinguish by means of the sensor output a sensor output derived from a bar code from a sensor output derived from a digitally modulated light emitting device.
Claim 12
Dependent Claim
26 words
A system according to claim 8 or 9, in which the distinguishing means detects whether pulses from the light sensor have sharp or decaying trailing edges.
Claim 13
Dependent Claim
31 words
A system according to claim 8, 9 or 10, in which the distinguishing means comprises a differentiating circuit and a circuit for detecting asymmetry in the output of the differentiating circuit.
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