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Restore the old p160 glider gun removed in oldid=132645 to match description in text above |
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==List of filters== | ==List of filters== | ||
* Multiple of 4 but not 8, ×2: [[Blocker]] | * Multiple of 4 but not 8, ×2: [[Blocker]] | ||
* Multiple of 8 but not 16, ×2: [[Rich's p16]], [[Charity's p16]] | * Multiple of 8 but not 16, ×2: [[Rich's p16]],<ref group="n">This also applies to filtering LWSS's and MWSS's (of the same phase but with frontends extended forwards by one cell), as shown in the [[RLE:P48lwss|p48 LWSS gun]]</ref> [[Charity's p16]] | ||
* Multiple of 16 but not 32, ×2: [[68P32]] | * Multiple of 16 but not 32, ×2: [[68P32]] | ||
* Multiple of 32 but not 64, ×2: [[51P384]]<ref name="post160020" /> | * Multiple of 32 but not 64, ×2: [[51P384]]<ref name="post160020" /> | ||
* Multiple of 5 but not 10, ×2: [[p10 filter]] | * Multiple of 5 but not 10, ×2: [[p10 filter]] | ||
* Multiple of 5 but not 15, ×3: [[Karel's p15]] | * Multiple of 5 but not 15, ×3: [[Karel's p15]] | ||
* Multiple of 15 but not 30, ×2: [[Queen bee shuttle]]<ref>As used in the [[RLE:Period90glidergun|smallest period-90 glider gun]] (note that it is shown in the [[p45 pi-heptomino hassler]] page, which also functions as a period-tripler, but is not a filter because it depends on a temporary block to destroy the second of every pair of gliders between those let through, which (if not destroyed) can otherwise destroy the hassler itself)</ref> | |||
==See also== | ==See also== | ||
* [[Period multiplier]] | * [[Period multiplier]] | ||
* [[Sparker]] | * [[Sparker]] | ||
==Notes== | |||
<references group="n" /> | |||
==References== | ==References== | ||
| Line 42: | Line 46: | ||
|p = 160020 | |p = 160020 | ||
|title = Re: Oscillator Discussion Thread | |title = Re: Oscillator Discussion Thread | ||
|author = | |author = Anivec | ||
|date = April 3, 2023 | |date = April 3, 2023 | ||
}}</ref> | }}</ref> | ||
Latest revision as of 19:04, 4 July 2025
A filter is an oscillator used to delete some but not all of the spaceships in a stream. For example, a blocker can delete every second glider in a stream of period 8n + 4, and can also do the same for LWSS streams. Other examples are the middleweight emulator, T-nosed p4 (either of which can be used to delete every second LWSS in a stream of period 4n + 2) and the fountain (which does the same for MWSS streams).
Filters can be used to make guns of high periods. For instance, the period-20 glider gun can be made p40 with a blocker, then p80 with Rich's p16, and even p160 with 68P32.1:
| p160 glider gun (click above to open LifeViewer) RLE: here Plaintext: here |
A smaller, more recent period-160 glider gun uses Charity's p16 as the first filter instead:
| p160 glider gun (click above to open LifeViewer) Catagolue: here |
List of filters
- Multiple of 4 but not 8, ×2: Blocker
- Multiple of 8 but not 16, ×2: Rich's p16,[n 1] Charity's p16
- Multiple of 16 but not 32, ×2: 68P32
- Multiple of 32 but not 64, ×2: 51P384[1]
- Multiple of 5 but not 10, ×2: p10 filter
- Multiple of 5 but not 15, ×3: Karel's p15
- Multiple of 15 but not 30, ×2: Queen bee shuttle[2]
See also
Notes
- ↑ This also applies to filtering LWSS's and MWSS's (of the same phase but with frontends extended forwards by one cell), as shown in the p48 LWSS gun
References
- ↑ Anivec (April 3, 2023). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ As used in the smallest period-90 glider gun (note that it is shown in the p45 pi-heptomino hassler page, which also functions as a period-tripler, but is not a filter because it depends on a temporary block to destroy the second of every pair of gliders between those let through, which (if not destroyed) can otherwise destroy the hassler itself)
External links
- Filter at the Life Lexicon