Continuous tuning arrangement for a multiband television receiver
First Claim
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1. In a system for tuning a receiver to all the channels in at least first and second bands in response to respective magnitudes of a tuning voltage, apparatus comprising:
- first and second terminals;
a continuous resistive element coupled between said terminals, said resistive element having first and second sections corresponding to said first and second bands, respectively;
voltage coupling means for coupling voltages to said first and second terminals;
a movable contact;
means for moving said movable contact along said resistive element to select ones of said channels, said tuning voltage being generated at said movable contact; and
position detecting means for detecting the position of said movable contact along said resistive element;
said voltage coupling means including at least first switching means coupled to said position detecting means for selectively coupling a first voltage to said first terminal when said movable contact is in said first section and a second voltage to said first terminal when said movable contact is in said second section, said first and second voltages being selected so that all of said channels in said first and second bands are tuned as said movable contact is continuously and consecutively moved along said resistive element.
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Abstract
A tuning system includes a resistive element coupled between two terminals and a movable contact which is moved along the resistive element to determine the tuning position. A switching arrangement selectively couples predetermined voltages to the terminals as a function of the position of the movable contact so that a tuning voltage for tuning all the channels in the low VHF, high VHF and UHF bands is generated at the movable contact as it is continuously and consecutively moved along the resistive element.
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Citations
7 Claims
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1. In a system for tuning a receiver to all the channels in at least first and second bands in response to respective magnitudes of a tuning voltage, apparatus comprising:
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first and second terminals; a continuous resistive element coupled between said terminals, said resistive element having first and second sections corresponding to said first and second bands, respectively; voltage coupling means for coupling voltages to said first and second terminals; a movable contact; means for moving said movable contact along said resistive element to select ones of said channels, said tuning voltage being generated at said movable contact; and position detecting means for detecting the position of said movable contact along said resistive element; said voltage coupling means including at least first switching means coupled to said position detecting means for selectively coupling a first voltage to said first terminal when said movable contact is in said first section and a second voltage to said first terminal when said movable contact is in said second section, said first and second voltages being selected so that all of said channels in said first and second bands are tuned as said movable contact is continuously and consecutively moved along said resistive element. - View Dependent Claims (2, 3, 4, 5)
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6. A system for tuning a receiver to various channels in first and second bands, comprising:
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a tunable circuit having a frequency response determined in response to a tuning voltage; first and second terminals; a resistive element coupled between said first and second terminals; means for coupling first and second voltages to said first and second terminals; a movable contact; means for moving said movable contact along said resistive element, said tuning voltage being generated at said movable contact; voltage divider means coupled between said first and second terminals for generating an output voltage having a magnitude substantially equal to the magnitude of said tuning voltage corresponding to a boundary between said first and second bands; comparator means responsive to said output voltage and said tuning voltage for generating a control voltage having a first level when the magnitude of said tuning voltage is less than the magnitude of said output voltage of said voltage divider and a second level when the magnitude of said tuning voltage is greater than the magnitude of said output voltage of said voltage divider; and first means selectively enabled in response to said first level of said control voltage for determining the frequency range of said tunable circuit in said first band and second means selectively enabled in response to said second level of said control voltage for determining the frequency range of said tunable circuit in said second band. - View Dependent Claims (7)
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Specification