fix fbank input

雾聪

2023-05-17 d29ed02c569de40ceb23861fe95a0e1c24b0b514

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.