PS: I should have mentioned that in my test case speedup of the filter 
loop was a factor of 37.5.

The speedup number I quoted, x 6, refers to execution of the whole 
program.  Execution time is once again dominated (about 75%) by time 
spent in sfrsd, as desired.

        -- Joe

On 10/27/2015 12:00 PM, Joe Taylor wrote:
> Hi Steve,
>
> Just to let you know:
>
> In r6011 I have changed the filter loop in subtract65.f90 from a
> time-domain convolution to a frequency-domain multiplication.  In my
> test case the speedup was a factor greater than 6.  Two-pass decoding of
> JT65 is now acceptably fast.  I think we have a definite winner!
>
>       -- Joe, K1JT

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