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US 3,937,972 AGranted
Electromagnetically energized scanning frequency synthesizer
AssigneeLinear Systems Incorporated
InventorStephen Charles Snell
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AssigneeLinear Systems Incorporated
InventorStephen Charles Snell
Estimating the term…
A frequency synthesizer for scanning a number of predetermined frequencies using radiated electromagnetic energy detected at an array of electromagnetic energy transducers for providing a frequency determinative code. The frequency code is obtained by insertion of a programmed data mask between a source of electromagnetic energy and the array of electromagnetic energy transducers. The frequency code is connected to the input of a programmable divider which also receives the output from a voltage controlled oscillator. The programmable divider provides an output frequency which is a quotient of the voltage controlled oscillator output frequency. The quotient output frequency is compared with a reference frequency for producing a control voltage for the voltage controlled oscillator. The voltage controlled oscillator is thereby driven to produce an output frequency determined by the coded input to the programmable divider. A series of adjacent arrays of electromagnetic energy transducers is disposed to be serially exposed to a plurality of serially excited electromagnetic energy sources. Electromagnetic energy is sensed at predetermined ones in each array of electromagnetic energy transducers in accordance with the frequency determinative code. The sources of electromagnetic energy are serially energized by serial output signals from a counter connected thereto and means are provided for bypassing a coded channel when a source of electromagnetic energy is inoperative.
A frequency synthesizer comprising means for radiating electromagnetic energy, an array of electromagnetic energy transducers spaced from said means for radiating for producing a plurality of discrete electrical output signals responsive to impingement of electromagnetic energy thereon, removable means for positioning between said means for radiating and said array having a predetermined pattern thereon for blocking said electromagnetic energy from predetermined transducers in said array, thereby providing a predetermined combination of said discrete electrical output signals, a voltage controlled oscillator for providing an output signal at a controlled output frequency, a programmable divider having a plurality of input terminals each connected to one of said discrete electrical output signals, said programmable divider connected to receive said controlled output frequency and producing an output signal having a divider output frequency determined by said predetermined combination of said discrete electrical output signals, means for providing a reference frequency, means for comparing said divider output frequency with said reference frequency producing a control signal related to the difference therebetween, said control signal being connected to said voltage controlled oscillator for driving said controlled output frequency to a predetermined value.
A frequency synthesizer comprising a source of electromagnetic energy, a geometric pattern of discrete electromagnetic energy transducers spaced from and for exposure to said source of electromagnetic energy, said pattern providing a data output dependent upon exposure of individual ones of said electromagnetic transducers to said source of electromagnetic energy, means for positioning between said source and said geometric pattern for providing a program pattern matching said geometric pattern of discrete transducers and having areas for blocking electromagnetic radiation, means for providing a reference frequency, a voltage controlled oscillator for providing an output frequency, a programmable counter for receiving said data output and said output frequency and providing a counter frequency which is a quotient of said output frequency, a frequency comparator for receiving said reference frequency and said counter frequency and providing a control voltage for said voltage controlled oscillator, whereby when said means for providing a program pattern overlies said geometric pattern of discrete transducers, predetermined ones of said discrete transducers are shielded from said source of electromagnetic energy so that said data output provides a counter frequency which causes said control voltage to drive said voltage controlled oscillator to a predetermined output frequency.
A frequency synthesizer for use with a radio frequency receiver of the type for receiving a plurality of reception frequencies and providing an enabling signal when a transmitted radio frequency is received and removing the enabling signal when no transmitted radio frequency is received, comprising an optical mask reader providing a data output, an optical mask for insertion into said optical mask reader and having at least one code thereon for determining said data output, a programmable divider for receiving said data output and for providing a divider ratio related thereto, a voltage controlled oscillator having an output frequency connected to said divider for providing a quotient frequency determined by said divider ratio, means for providing a reference frequency, means for receiving said reference frequency and said quotient frequency for providing a control output related to the difference therebetween, said control output being connected to said voltage controlled oscillator, whereby said output frequency is determined by said code.
Dependencies are inferred from the claim text.