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Tone signal decoder
| Details |
Inventors: Iwata, Keisuke;
Assignee: Iwata Electric Co., Ltd. (Tokyo, JP)
Primary Examiner: Yusko; Donald J.
Assistant Examiner:
Attorney, Agent or Firm: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.
A tone signal decoder in a remote control device which uses one tone signal to feed information. The tone signal decoder comprises a charge and discharge circuit having a capacitor to control the latter by application of said tone signal thereto, a bypass circuit for charging or discharging said capacitor, when said tone signal is not applied, within the time shorter than the charge or discharge time by said charge and discharge circuit, and a threshold circuit actuated when said capacitor reaches a threshold level. Immediately when said tone signal is interrupted by said bypass circuit, said capacitor is brought into an initial set state to prevent malfunction with respect to the other tone signal fed by the same carrier. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a decoder for a receiver device in a remote control device using one tone signal, which device is very simple in circuit construction to avoid malfunction with respect to the other tone transmitting system.
It is a further object of the present invention to provide a one tone signal decoder which can assure whether or not a power source voltage is at a predetermined level when the power is turned on.
In accordance with the present invention, there is provided a tone signal decoder responsive to a predetermined tone signal, comprising a power source, an input terminal to which a tone signal is applied, a charge and discharge circuit connected to said input terminal, said circuit having a capacitor, said capacitor being controlled in charge and discharge thereof by application of said tone signal thereto, a bypass circuit connected to said charge and discharge circuit so that when said tone signal is not applied, said capacitor is placed in one state out of the charge and discharge states within a time shorter than that required by said charge and discharge circuit, and a threshold circuit actuated when the terminal voltage reaches a threshold level because of said one state of said capacitor.
In a preferred embodiment of the present invention, when the predetermined tone signal is applied to the input terminal, the capacitor having been charged by the power source voltage starts discharging, and when the terminal voltage of the capacitor reaches a predetermined value by said discharge of the capacitor, a transistor for detecting a threshold level is turned on, and develops an output signal.
During the time when the tone signal is applied to the input terminal, the capacitor keeps discharging.
When the tone signal terminates, the capacitor is immediately charged by the power source voltage, but at this time, the capacitor is rapidly charged by two transistors which constitute an inverting amplifier in the bypass circuit
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Fault Detection 
