Envelope Filter
A look at what is currently available on eBay
 DOD Envelope Filter FX25 US $65.00 
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 Electro Harmonix Micro Q-Tron Envelope Filter Bundle US $88.20
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 DigiTech Synth Wah Envelope Filter X Series Guitar Effects Pedal US $35.00
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 DigiTech XSW Synth Wah Envelope Filter Pedal US $9.95
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 MXR M82 M-82 ENVELOPE FILTER BASS GUITAR PEDAL NEW ! US $139.95
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 100 ACS Filter Envelopes for Pitco Friolator A1820E5 US $69.99
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 Electro-Harmonix Q-Tron Envelope Filter Guitar Bundle US $150.00
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 WMD Super Fatman Envelope Filter US $279.00
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 DIGITECH X Synth WAH Envelope FILTER FX PEDAL Guitar EFFECT Pedals Effects LOT US $25.00
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 Electro-Harmonix Q-Tron Envelope Filter Guitar Pedal US $148.50
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 EBS BassIQ Triple Envelope Filter Pedal US $199.00
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 EBS Bass IQ Triple Envelope Filter Pedal US $199.00
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Having trouble figuring out how the word "epoch" works in this equation and what the equation means. Help?
The low-frequency band of separated signal (5-80 Hz) was rectified and low-pass filtered to produce a smoothed out envelope. The low pass filter averaged the rectified signal so that the threshold level could be set to detect the presence of Fetal Activity (FA). The output from the low-pass filter was recorded every 0.25s (seconds). For each 0.25s epoch that the low-pass filter exceeded the threshold level, the presence of FA was recorded. Thus the FA output from the ETAM monitor reflected the 0.25s epochs during which the FA above a specific threshold was present, rather than individual fetal movements.
Epoch is "an instant of time or a date selected as a point of reference. See: http://www.merriam-webster.com/dictionary/epoch
In this case, 0.25s is an epoch.
No equation detected in your question.
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