why max_bps

[lixinghe1999]

According to the source, the max_bps is calculated as below:

self.max_bps = (2/overlap)*self.max_streams * math.log2(codebook_size)group_size // (20time_patch//2)

I can understand most symbols, but why there is a 20 in it?
Does it refer to the win_len, which is 20 by default?
However, normally we use the hop_len for bitrate calculation.

Would you mind teach me the reasons behind?

[lixinghe1999]

after a careful analysis, I suspect the special number 4 = overlap (2) * patch_size[1] (2)
so that the real frame rate is hop_len * 4, occasionally equals to win_len.