Sleep timer for audio/visual apparatus and method of sleep timer operation
First Claim
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1. A sleep timer for audio/visual apparatuses for turning off source equipment of audio/visual signals, comprising:
- sleep timer activating means for outputting a first signal to activate a timer operation having a first mode and a second mode;
timer-mode selecting means responsive to said first signal, said timer-mode selecting means selecting said first mode if at least one of the source equipment is operating, and selecting said second mode if the source equipment are not operating;
sleep time setting means which is set to a predetermined length of time by said timer-mode selecting means when said second mode is selected;
time-up-detecting means for outputting a second signal in the first mode when said at least one of source equipment completes an operation thereof, and for outputting a third signal when said predetermined length of time of said sleep time setting means expires; and
power-turn-off means for turning off said source equipment in response to said second signal as well as said third signal.
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Abstract
A sleeper timer for the source equipment of audio/visual apparatuses such as a cassette tape deck, CD player, AM/FM tuner, and video disk play incorporates an auto sleep mode where the source equipment are turned off as soon as the source equipment completes its operation, and a conventional sleep timer mode where the source equipment are turned off when a predetermined length of time of a timer expires.
19 Citations
7 Claims
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1. A sleep timer for audio/visual apparatuses for turning off source equipment of audio/visual signals, comprising:
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sleep timer activating means for outputting a first signal to activate a timer operation having a first mode and a second mode; timer-mode selecting means responsive to said first signal, said timer-mode selecting means selecting said first mode if at least one of the source equipment is operating, and selecting said second mode if the source equipment are not operating; sleep time setting means which is set to a predetermined length of time by said timer-mode selecting means when said second mode is selected; time-up-detecting means for outputting a second signal in the first mode when said at least one of source equipment completes an operation thereof, and for outputting a third signal when said predetermined length of time of said sleep time setting means expires; and power-turn-off means for turning off said source equipment in response to said second signal as well as said third signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of setting in a standby condition source equipment for audio/visual apparatuses having a timer, comprising the steps of:
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outputting, when commanded by an operator, a first signal for activating a timer operation which has a first mode and a second mode; selecting said first mode if at least one of the source equipment is operating, and selecting said second mode if none of the source equipment is operating; setting a predetermined length of time in the timer when said second mode is selected; outputting a second signal in the first mode when the source equipment completes an operation thereof, and outputting a third signal in the second mode when said predetermined length of time of said timer expires; and setting said source equipment in a standby condition in response to said second signal as well as said third signal.
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Specification