| 摘要 |
<p>A detector for determining whether the time duration (t<Sub>2</Sub>-t<Sub>1</Sub>) between two events, such as a positive and a negative peak of a waveform, is greater or less than a predetermined time interval (To), comprises a delay line (20) for delaying the waveform by the predetermined time interval (To). A peak detector (22) of a first polarity for detecting the first occurring peak of the waveform is responsive to the delayed waveform to provide a signal [S<Sub>1</Sub>(t-T<Sub>0</Sub>), S<Sub>3</Sub>(t)] at the occurrence of its first peak. A peak detector (21) of a second polarity detects the second peak of the undelayed waveform and providing a signal S2(t) at the occurrence of its second peak. A time sequence comparator (23) provides a first output when the signal S<Sub>3</Sub>(t) from the first peak detector (22) occurs prior to the signal S<Sub>2</Sub>(t) from the second peak detector (21) and a second output when the signal S,(t) from the second peak detector (21) occurs prior to the signal S2(t) from the first peak detector (22).</p><p>In another embodiment, one of the outputs of a combined peak detector is delayed and applied together with the undelayed other output to the time sequence comparator.</p> |
