Irreducible components of canonical diagrams for spectral null constraints at f=f/sub s/k are studied, where k and n are integers and f/sub s/ is the symbol frequency. To identify systematically all irreducible components of the canonical diagrams for first-order spectral nulls at f, we give a set of channel symbol sequences specifying all of them. If n is a prime number, then each sequence in the set corresponds to exactly one label-preserving graph isomorphism class of irreducible components. We also give a set of channel symbol sequences specifying all irreducible components of canonical diagrams for second-order spectral nulls at DC (i.e., f=0).
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机译：研究了在f = f / sub s / k / n时频谱无效约束的正则图的不可约成分，其中k和n是整数，f / sub s /是符号频率。为了系统地确定f处一阶谱零点的正则图的所有不可约成分，我们给出了一组指定所有它们的信道符号序列。如果n是质数，则集合中的每个序列都恰好对应于不可约成分的一个保留标签的同构图类。我们还给出了一组信道符号序列，这些序列指定了规范图的所有不可约分量，这些规范图针对DC处的二阶频谱零点（即f = 0）。
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