Circuit for detecting the operational state of a television receiver

A circuit for detecting the operational states of a television receiver, said circuit comprising:

• tuning detecting circuit means, responsive to a detected signal from an automatic fine tuning circuit, for detecting whether a tuner is operating in a proper tuning region, a slight mistuning region, or a mistuning region, and generating a tuner detecting output signal indicative of the region of tuner operation;
• synchronization detecting circuit means, responsive to a synchronizing signal and a flyback pulse, for detecting whether the synchronization is maintained, and generating a synchronization detecting output signal indicative of the maintenance of synchronization;
• audio noise detecting circuit means, responsive to an audio intermediate frequency signal, for detecting whether said audio signal includes a noise component and generating a noise detecting output signal indicative of the presence of said noise component;
• and logic circuit means, responsive to said tuner detecting output signal, said synchronization detecting output signal and said noise detecting output signal for generating a first output signal when said tuner is operating in said proper tuning region, a second output signal when said tuner is operating in said slight mistuning region, and, a third output signal when said tuner is operating in said mistuning region, wherein said first, second and third output signals represent said operational states;
• and
• a first driving circuit means, representative to said first output signal, for driving a first light-emitting device;
• and a second driving circuit means, responsive to said second and third output signals, for driving a second light-emitting device, said third output signal having alternative high and low levels for intermittently driving said second light-emitting device.

A circuit for detecting the operational states of a television receiver, said circuit comprising:

• tuning detecting circuit means, responsive to a detected signal from an automatic fine tuning circuit, for detecting whether a tuner is operating in a proper tuning region, a slight mistuning region, or a mistuning region, and generating a tuner detecting output signal indicative of the region of tuner operation;
• synchronization detecting circuit means, responsive to a synchronizing signal and a flyback pulse, for detecting whether the synchronization is maintained, and generating a synchronization detecting output signal indicative of the maintenance of synchronization;
• audio noise detecting circuit means, responsive to an audio intermediate frequency signal, for detecting whether said audio signal includes a noise component and generating a noise detecting output signal indicative of the presence of said noise component;
• and logic circuit means, responsive to said tuner detecting output signal, said synchronization detecting output signal and said noise detecting output signal for generating a first output signal when said tuner is operating in said proper tuning region, a second output signal when said tuner is operating in said slight mistuning region, and, a third output signal when said tuner is operating in said mistuning region, wherein said first, second and third output signals represent said operational states;
• and
• a muting circuit, responsive to said noise detecting output signal and coupled to a loudspeaker which generates sound for muting the sound when said audio signal includes said noise component.

A circuit for detecting the operational states of a television receiver, said circuit comprising:

• tuning detecting circuit means, responsive to a detected signal from an automatic fine tuning circuit, for detecting whether a tuner is operating in a proper tuning region, a slight mistuning region, or a mistuning region, and generating a tuner detecting output signal indicative of the region of tuner operation;
• synchronization detecting circuit means, responsive to a synchronizing signal and a flyback pulse, for detecting whether the synchronization is maintained, and generating a synchronization detecting output signal indicative of the maintenance of synchronization;
• audio noise detecting circuit means, responsive to an audio intermediate frequency signal, for detecting whether said audio signal includes a noise component and generating a noise detecting output signal indicative of the presence of said noise component;
• and logic circuit means, responsive to said tuner detecting output signal, said synchronization detecting output signal and said noise detecting output signal for generating a first output signal when said tuner is operating in said proper tuning region, a second output signal when said tuner is operating in said slight mistuning region, and, a third output signal when said tuner is operating in said mistuning region, wherein said first, second and third output signals represent said operational states;
• wherein said audio signal has a first frequency band and a second frequency band which is separate and distinct from said first band, and wherein said second band is above said first band, and said audio noise detecting circuit comprising:
• filter circuit means for passing said audio signal in a first frequency bandpass extending from an upper end of said first frequency band to a lower end of said second band, and for passing said audio signal in a second bandpass extending above an upper end of said second frequency band;
• and noise detecting means, responsive to said filter circuit, for detecting whether said audio signal includes said noise component.

A circuit for detecting the operational states of a television receiver, said circuit comprising:

• tuning detecting circuit means, responsive to a detected signal from an automatic fine tuning circuit, for detecting whether a tuner is operating in a proper tuning region, a slight mistuning region, or a mistuning region, and generating a tuner detecting output signal indicative of the region of tuner operation;
• synchronization detecting circuit means, responsive to a synchronizing equal and a flyback pulse, for detecting whether the synchronization is maintained, and generating a synchronization detecting output signal indicative of the maintenance of synchronization;
• audio noise detecting circuit means, responsive to an audio intermediate frequency signal, for detecting whether said audio signal includes a noise component and generating a noise detecting output signal indicative of the presence of said noise component;
• and logic circuit means, responsive to said tuner detecting output signal, said synchronization detecting output signal and said noise detecting output signal for generating a first output signal when said tuner is operating in said proper tuning region, a second output signal when said tuner is operating in said slight mistuning region, and, a third output signal when said tuner is operating in said mistuning region, wherein said first, second and third output signals represent said operational states;
• and
• a circuit means responsive to said first output signal, for preventing the operation of said audio noise detecting circuit when said tuner is operating in said proper tuning region.

A circuit for detecting the operational states of a television receiver, said circuit comprising:

• tuning detecting circuit means, responsive to a detected signal from an automatic fine tuning circuit, for detecting whether a tuner is operating in a proper tuning region, a slight mistuning region, or a mistuning region, and generating a tuner detecting output signal indicative of the region of tuner operation;
• synchronization detecting circuit means, responsive to a synchronizing signal and a flyback pulse, for detecting whether the synchronization is maintained by comparing the synchronizing signal to said flyback pulse and generating a synchronization detecting output signal indicative of the maintenance of synchronization;
• audio noise detecting circuit means, responsive to an audio intermediate frequency signal, for detecting whether said audio signal includes a noise component and generating a noise detecting output signal indicative of the presence of said noise component;
• and logic circuit means, responsive to said tuner detecting output signal, said synchronization detecting output signal and said noise detecting output signal for generating a first output signal when said tuner is operating in said proper tuning region, a second output signal when said tuner is operating in said slight mistuning region, and, a third output signal when said tuner is operating in said mistuning region, wherein said first, second and third output signals represent said operational states.