dd question

I have a binary file with data. Each block of 48 bytes is a record. I
want to extract the first 8 bytes within each record. I'm thinking this
should be possible with dd, but gawk, perl - anything goes. It just has
to be fast, because the data files are ~ 1Gb.

I can do this in C++ but I was just wondering if it can be done with
existing well tested tools.

Any suggestions? Thanks!

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