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document and test automatic_nch and automatic_fmax

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Change-Id: Ib6a5e5f8278456725c810a9f7f0c7f5cafd78bd2
This commit is contained in:
Jan Kundrát
2020-05-23 13:00:32 +02:00
parent 15ea7218e9
commit a453c57996
1 changed files with 22 additions and 0 deletions
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22
gnpy/core/equipment.py
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@@ -338,10 +338,32 @@ def automatic_spacing(baud_rate):
def automatic_nch(f_min, f_max, spacing):
"""How many channels are available in the spectrum
:param f_min Lowest frequenecy [Hz]
:param f_max Highest frequency [Hz]
:param spacing Channel width [Hz]
:return Number of uniform channels
>>> automatic_nch(191.325e12, 196.125e12, 50e9)
96
>>> automatic_nch(193.475e12, 193.525e12, 50e9)
1
"""
return int((f_max - f_min) // spacing)
def automatic_fmax(f_min, spacing, nch):
"""Find the high-frequenecy boundary of a spectrum
:param f_min Start of the spectrum (lowest frequency edge) [Hz]
:param spacing Grid/channel spacing [Hz]
:param nch Number of channels
:return End of the spectrum (highest frequency) [Hz]
>>> automatic_fmax(191.325e12, 50e9, 96)
196125000000000.0
"""
return f_min + spacing * nch