Filters Flashcards
Define filter
Used to exclude waveforms that are out of range so that waveforms of most importance can be recorded without distortion
Which low filter setting will most faithfully record the amplitude of a 1.5hz slow wave?
.1 Hz
- The lower the LFF, the more voltage of the slow frequencies will be recorded
Name possible situations in which you may need to use a HFF of 35 or 15 hz.
Excessive muscle artifact that cannot be removed by any other means
Which of the following is attenuated by a low pass filter of 15hz
20 Hz
Which filter setting will record the greatest amplitude of a 50 hz wave?
70 Hz
Which of the following is most attenuated by a TC of .01 sec?
3 Hz
Which filter setting will record the greatest amplitude of a 70 Hz wave?
70 Hz
Which of the following is most attenuated by a low filter of .1 Hz?
3Hz
The faster the slow activity the more it will be attenuated by a LFF
Which time constant will record the greatest amplitude of a 1 Hz wave?
1 Second
The longer the time constant the more voltage of the slow activity will be recorded.
Which filter settings will record the greatest amplitude of a 04Hz wave?
.1 Hz
The lower the LFF setting, the more voltage of the slow frequency will be recorded.
Which one of the following frequencies is most attenuated by a low filter of 5 Hz?
.1 Hz
A high filter setting at 15 Hz will not show significant information at?
50 Hz
The faster the frequency the more the 15 Hz wave will attenuate the signal
Name a possible situation in which you may need to use a LFF of 5 Hz?
To emphasize fast components such as spikes or sleep spindles
To reduce sweat artifact
Name some possible situations in which you may need to use a LFF of .3 or .1 Hz?
To emphasize low amp slowing
During an ECI recording to make sure there is now slow activity
