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low
A low-pass filter (LPF) is a filter that passes signals with a frequency lower than a selected cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. The exact frequency response of the filter depends on the filter design. The filter is sometimes called a high-cut filter, or treble-cut filter in audio applications. A low-pass filter is the complement of a high-pass filter.
In the optical domain, high-pass and low-pass have the opposite meanings, with a "high-pass" filter (more commonly "long-pass") passing only longer wavelengths (lower frequencies), and vice-versa for "low-pass" (more commonly "short-pass").
Low-pass filters exist in many different forms, including electronic circuits such as a hiss filter used in audio, anti-aliasing filters for conditioning signals prior to analog-to-digital conversion, digital filters for smoothing sets of data, acoustic barriers, blurring of images, and so on. The moving average operation used in fields such as finance is a particular kind of low-pass filter, and can be analyzed with the same signal processing techniques as are used for other low-pass filters. Low-pass filters provide a smoother form of a signal, removing the short-term fluctuations and leaving the longer-term trend.
Filter designers will often use the low-pass form as a prototype filter. That is, a filter with unity bandwidth and impedance. The desired filter is obtained from the prototype by scaling for the desired bandwidth and impedance and transforming into the desired bandform (that is low-pass, high-pass, band-pass or band-stop).
Vortex Pro Rings 30mm low. Planned on getting a 30mm scope and went with a one inch tube instead. Unused. Package opened and screw degreased.
$60. Local pick up in Corvallis/Albany.
Lightly used set of Talley rings for 30mm scopes. Low height and for Remington 700 actions. The base is built in, so these are all you need to mount your scope. Very lightweight if you're looking to build a mountain rifle or just shed some ounces. Screws are the standard #6-48 size.
$30 - I can...
Used Noveske 13.7" Mid barrel with cross pinned low pro gas block and stainless gas tube.
• 13.7" 5.56mm Mid-Length 416R Stainless with 1:7 twist
• Individual serialized barrel for QC purposes
• Hand polished Noveske Proprietary Match Chamber
• Mid length gas tube included
• Noveske marked gas...
Trade Glock 17, less than 200 rds, 4 mags, IWB holster, great condition.
Looking for more concealable handgun or $500. Examples Glock 19, Glock 43x, FN 9, or any interesting offer. Please reply with any questions.
Two of these scopes are in pristine condition. Great for a starter scope.
Simons 3X9 $25
Bushness Sportview 4X32 $25
Hurricane scope (Beater but the optic is clear.) $5
Leupold Mark AR 4-12x40 (Mil Dot Reticle) scope and Leupold Back Country 1" Low rings. This is used, but in great shape. Was mounted on a rifle which was hardly shot. It will come with what is in the photos. The box is a Leupold box but for a different scope. No Trades. Just selling this one...
Excellent condition. Barely any signs of use. Color: Multicam. Size small. $140. Retail price $200. SOLD!
Seattle FTF
Will trade for a medium belt. Also have a lightly used Crye SPC Plate Carrier in medium I will be posting shortly if anyone is also looking.
Manufacturer Product link...
I've only shot this once about 6 months ago, probably less than 20 rounds through it and left in the safe after a short range day.
No Trades, please. Transfer on buyer and can meet within 30 miles of Canby, OR. *FFL of choice is @philcoates (Pioneer Armory), out of Oregon City.
I'm in a pinch...
FN SCAR 20S 7.62x51
****No Washington Sales**** Scope and mount pictured NOT available
Original owner, has only been used once for about 60 rounds during a sight in session and some plinking.
Comes with (1) 10 round Mag Scar is completely stock except for muzzle break
Original Box and...
Need cash for an upper -
Ruger PC9, standard model, like new w/5 33rd KCI mags and 1 15rd Glock 19 mag.
Ruger 10/22, standard model, like new, w/3 factory 10rd mags and Bushnell TRS25 red dot.
Today in Clatskanie or tomorrow in the Portland area.
$750 cash.
Selling a complete M&P 1.0 slide assembly including barrel & guide rod assembly 4.25". The gun had under 200 rounds fired. I bought it several years ago from another party. It was unfired when I got it. The previous owner installed an Apex forward sear trigger kit in it and dinged up the base...
Hello everyone, my FFL has listed my vintage Glock 17 gen 2 on gunbroker. It's a five digit serial number and has a vintage Laser devices Inc. laser attached. It's located in Marysville, Wa.
https://www.gunbroker.com/item/1026990261
My FFL is a member here, if you'd like to talk with him you...
Lowest price ever by a long shot per the price history. I personally prefer the electronic kind but these are a good backup.
Merry Christmas everyone!
https://www.preppingdeals.net/deals/amazon-walkers-pro-low-profile-folding-earmuffs
Sig Sauer P229 chamber in .357sig German made frame
Sig Sauer P229 chambered in .357sig. comes with 2-10rd magazines.
Price is $800. Transfer fees on buyer. Perfer local transfer. No trade.
Lowest price ever. I prefer electronic muffs for shooting but these are nice to have as backups/extras.
https://www.preppingdeals.net/deals/amazon-walkers-razor-slim-passive-ultra-low-profile-27db-nrr-earmuffs-black