assert multiplier >= 0
if (period_min == period_max) and (min_inter_symbol_distance == 0):
raise ValueError("If (period_min == period_max) a non-zero",
- "inter-symbol distance MUST be specified")
+ "min_inter_symbol_distance MUST be specified")
symbol_distance = 2 * (period_max - period_min)
if symbol_distance == 0: