Signal break detecting circuit
AssigneeNEC Corporation
InventorHidemi Noguchi
Life of this patent
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Abstract
This invention provides a signal break detecting circuit for reducing time required for detecting a data signal break. A difference between an average value of data signal amplified by a limiter amplifier (2) to a predetermined amplitude (output of a full-wave rectifying circuit (7)) and a peak value (output of a peak value detecting circuit (5)) is compared with a reference voltage Vth by a comparator (9) and if the difference drops below the reference voltage Vth, an alarm is dispatched. Consequently, as compared to a conventional technology in which the data signal break is detected by detecting that the peak value of the reception signal drops to a predetermined value, time required for detecting a data signal break can be reduced.
Claims22
A signal break detecting circuit for detecting a signal break in reception signal, comprising:
- a first value detecting means for detecting a first value obtained corresponding to the amplitude of said reception signal;
- a second value detecting means for detecting a second value which is obtained corresponding to the amplitude of said reception signal and different from said first value;
- a difference detecting means for detecting a difference between said first value and said second value;
- and
- a comparing means which compares output of said difference detecting means with a predetermined reference value and outputs a comparison result.
A signal break detecting circuit for detecting a signal break in a reception signal, comprising:
- a first value detector that detects a first value based upon an amplitude of said reception signal;
- a second value detector that detects a second value based upon the amplitude of said reception signal and different from said first value;
- a difference detector that detects a difference between said first value said second value;
- and
- a comparator that compares said difference with a predetermined reference value and outputs a comparison result.
Dependencies are inferred from the claim text.