www.gusucode.com > signal 工具箱matlab源码程序 > signal/@filtdes/@abstractmagfir/todb.m
function newval = todb(h,val,passOrStop) %TODB Convert linear value to dB. % Author(s): R. Losada % Copyright 1988-2002 The MathWorks, Inc. switch passOrStop, case 'pass', newval = 20*log10((1+val)/(1-val)); case 'stop', newval = -20*log10(val); end