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367 bug reduce carrier power in am dsb #369

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Merged
MattCarrickPL merged 1 commit into from
Apr 23, 2025
Merged

367 bug reduce carrier power in am dsb #369

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10 changes: 5 additions & 5 deletions torchsig/signals/builders/am.py
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Original file line number Diff line number Diff line change
Expand Up @@ -61,12 +61,12 @@ def am_modulator ( class_name:str, bandwidth:float, sample_rate:float, num_sampl
if class_name == "am-dsb-sc":
baseband_signal = shaped_message
elif class_name == "am-dsb":
# build carrier
carrier = np.ones(len(shaped_message))
# scale to unit power
carrier = carrier/np.sqrt(np.mean(np.abs(carrier)**2))
# randomly determine modulation index
modulation_index = rng.uniform(0.1,1)
modulation_index = rng.uniform(0.8,4)
# find the max of the message
shaped_message_max = np.max(np.abs(shaped_message))
# build and scale the carrier
carrier = (shaped_message_max/modulation_index)*np.ones(len(shaped_message))
# add in the carrier
baseband_signal = (modulation_index*shaped_message) + carrier
elif class_name == "am-lsb":
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