fix bug for 48k wav in h5 (#890)

zhaomingwork

2023-08-23 8257c10627f4e773c62a5f5e15598da0ec607126

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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.