Define better. More readable/maintainable? Faster? Algorithmically more elegant? I'm always a huge fan of "works," which your code does. 
print my $out = join '', map {substr unpack('B8'), 1} split //, '4B';

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substr, unpack 
print my $out = join '', map {sprintf '%07b', ord} split //, '4B';

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sprintf, ord

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: Convert ASCII string to 7-bit binary string by kennethk
in thread Convert ASCII string to 7-bit binary string by Pascal666

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