Bar type channel identification apparatus for a television receiver
AssigneeRCA Corporation
InventorTony L. Shiu
Life of this patent
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Abstract
A tuning system of a television receiver of the type which changes the magnitude of a tuning voltage until an RF carrier corresponding to a television channel is located includes channel identification apparatus for generating a vertical tuning bar at a predetermined height and having a horizontal position determined by the magnitude of the tuning voltage until a carrier is detected and after a carrier is detected gradually changing its height until it disappears to provide a positive indication to a viewer that a carrier has been detected.
Claims11
In a television including a tuner responsive to the magnitude of a tuning signal for tuning RF carriers to produce an IF signal;
- search means for changing the magnitude of said tuning signal until an RF carrier corresponding to a television channel has been tuned, said search means generating a search signal having a first level when said tuning voltage is changing and a second level when said tuning signal stops changing after an RF carrier for a television channel has been located;
- signal processing means responsive to said IF signal for generating at least one video signal;
- a picture tube responsive to said video signal for generating at least one electron beam;
- deflection means responsive to said IF signal for generating horizontal and vertical deflection signals for said electron beam;
- channel identification apparatus comprising:
- first means responsive to one of said vertical and horizontal deflection signals and said tuning voltage for controlling said signal processing means to produce a tuning bar on said screen having a position in a direction perpendicular to its length determined by the magnitude of said tuning voltage;
- second means responsive to the other one of said deflection signals and to said search signal and coupled to said first means for selectively causing the length of said tuning bar to have a first predetermined value in response to the first level of said search signal and to change by increments at the rate of said other deflection signal to a second predetermined value, different from said first predetermined value, in response to the second level of said search signal.
Dependencies are inferred from the claim text.