40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
#! /usr/bin/python
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#
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# gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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#
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# Copyright (C) 2018
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# Libre Space Foundation <http://librespacefoundation.org/>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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#
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def lcm(p,q):
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p, q = abs(p), abs(q)
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m = p * q
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if not m: return 0
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while True:
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p %= q
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if not p: return m // q
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q %= p
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if not q: return m // p
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def find_decimation(baudrate, min_decimation=4, audio_samp_rate=48e3,
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multiple = 2):
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while(min_decimation * baudrate < audio_samp_rate):
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min_decimation = min_decimation + 1
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# Because we use a clock recovery that decimates,
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# we need a number that is multiple of the clock recovery decimation
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if min_decimation % multiple:
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min_decimation = min_decimation + multiple - min_decimation % multiple
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return min_decimation |