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US 4,232,394 AGranted
Station-signal frequency indication system for radio receiver
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorMasakazu Fujishima
Life of this patent
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Abstract
A station-signal frequency indicating system for a radio receiver, in which the content in a counter counting an output of a local oscillator in the receiver is temporarily retained by a latching circuit and in turn is displayed by an indicator, and in which a control circuit inhibits the retained content in the latching circuit from being changed, immediately after the receiver is tuned exactly to a station signal until the receiver is detuned from this station signal.
Claims10
A station-signal frequency indicating system for a radio receiver, comprising:
- a counter circuit associated with said radio receiver for repetitively counting during a sequence of one or more counting periods a signal having a frequency related to a tuning frequency of said radio receiver to represent the tuning frequency of said radio receiver by a count obtained in said counter circuit at the end of each counting period for which counting is carried out by said counter circuit;
- a latching circuit for receiving and temporarily retaining the count obtained in said counter circuit at the end of said each counting period;
- an indicator means for displaying the count retained in said latching circuit;
- and
- a control circuit coupled to said radio receiver for stopping said latching circuit from renewing its retaining count at the moment that said radio receiver becomes tuned exactly to a given station signal, and thereafter causing said latching circuit to keep its retaining count unchanged until said radio receiver becomes substantially detuned from said given station signal, whereby the frequency of said given station signal is displayed by said indicator means so long as this station signal is being received by said radio receiver.
2 more elements
Dependencies are inferred from the claim text.