1. A method for detecting acoustic parameters from acoustic energy traversing a borehole, comprising: introducing a pulse of acoustic energy within said borehole at a first depth; receiving a first acoustic signature signal within said borehole in response to said pulse having first, second, third and fourth positive peaks; deriving a plurality of first digital representations from said received signal; determining from said first digital representations first and second compressional arrival times; determining from said first digital representations first and second shear arrival times; determining from said first digital representations a first, second, third and fourth amplitude corresponding to respective ones of said first, second, third and fourth peaks; determining a third compressional arrival time at a second depth adjacent said first depth; deriving a difference between said first and said third compressional arrival times; and selecting a compressional arrival time as a function of said difference.