Method and apparatus for indicating proximity of film scanner to CRT display monitor
First Claim
1. A method of determining that a film scanner having a magnetic read head is in detrimentally close proximity to a source of electromagnetic radiation, the method comprising:
- sensing an output of a magnetic read head adapted to sense film magnetic data transitions during a predetermined time period during which film magnetic data transitions are not present at the read head;
determining from said sensed output the presence of an amount of electromagnetically induced noise that will detrimentally affect detectability of data signal transitions sensed by the magnetic read head; and
generating an output indication representative of the fact that the film scanner is detrimentally close to said source of electromagnetic radiation.
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Accused Products
Abstract
A photographic film scanner having magnetic data read capability is provided with a function that senses an unacceptably high electromagnetic noise interference in the read head output, such as might be caused by the scanner being too close to a host computer monitor, and that outputs a warning to the user to alert the user to the need to move the scanner farther away from the monitor. The warning can be in the form of a visual display, such as a warning message displayed on the computer monitor or a blinking red light on the scanner. Alternatively, or else in conjunction with the visual warning, it can be an audible warning such as a voice message or a beeping sound.
20 Citations
17 Claims
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1. A method of determining that a film scanner having a magnetic read head is in detrimentally close proximity to a source of electromagnetic radiation, the method comprising:
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sensing an output of a magnetic read head adapted to sense film magnetic data transitions during a predetermined time period during which film magnetic data transitions are not present at the read head;
determining from said sensed output the presence of an amount of electromagnetically induced noise that will detrimentally affect detectability of data signal transitions sensed by the magnetic read head; and
generating an output indication representative of the fact that the film scanner is detrimentally close to said source of electromagnetic radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining that a film scanner having a magnetic read head is in detrimentally close proximity to a source of electromagnetic radiation, the method comprising:
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sensing an output of said magnetic read head adapted to sense film magnetic data transitions during a predetermined time period during which film magnetic data transitions are not present at the read head;
providing a threshold value of said output corresponding to a predetermined allowable level of electromagnetically induced noise that will not detrimentally degrade magnetic data read capability of said magnetic read head;
comparing an amplitude characteristic of the magnetic read head output sensed during said predetermined time period with said threshold value; and
outputting a failure indication if said amplitude characteristic exceeds said predetermined allowable output noise level. - View Dependent Claims (10, 11, 12)
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13. Apparatus for determining that a film scanner having a magnetic read head is in detrimentally close proximity to a source of electromagnetic radiation, the apparatus comprising:
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a magnetic read head adapted to sense film magnetic data transitions;
magnetic read head circuit;
a circuit that senses an output of a magnetic read head in the scanner during a predetermined time period during which film magnetic data transitions are not present at the read head, and a controller that determines from said sensed output the presence of an amount of electromagnetically induced noise that will detrimentally affect detectability of data signal transitions sensed by the magnetic read head, and controller that generates, in response to said determination, an output indication representative of the fact that the film scanner is detrimentally close to said source of electromagnetic radiation. - View Dependent Claims (14)
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15. A system for determining that a film scanner having a magnetic read head is in detrimentally close proximity to a source of electromagnetic radiation, the system comprising:
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a magnetic read head adapted to sense film magnetic data transitions;
a magnetic read head circuit;
a circuit that senses an output of a magnetic read head in the scanner during a predetermined time period during which film magnetic data transitions are not present at the read head; and
controller apparatus that determines from said sensed output the presence of an amount of electromagnetically induced noise that will detrimentally affect detectability of data signal transitions sensed by the magnetic read head;
that generates, in response to said determination, an output indication representative of the fact that the film scanner is detrimentally close to said source of electromagnetic radiation; and
that provides, in response to said output indication a sensible warning to a user of the film scanner indicative of the film scanner being in detrimentally close proximity to said source of electromagnetic radiation.- View Dependent Claims (16, 17)
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Specification