hy ber ▁Pass ▁ ▁References ▁ ▁Further ▁reading ▁ ▁External ▁links ▁▁ ▁History ▁of ▁K hy ber ▁Pass , ▁Pakistan ▁ ▁Tw il ight ▁histor ies , ▁Napoleon ▁in ▁Afghan istan ▁ ▁Category : A fg han istan – P ak istan ▁border ▁cross ings ▁Category : Land forms ▁of ▁P akt ia ▁Province ▁Category : Mount ain ▁passes ▁of ▁Afghan istan ▁Category : Mount ain ▁passes ▁of ▁K hy ber ▁Pak ht unk h wa ▁Category : Mount ain ▁passes ▁of ▁the ▁H indu ▁K ush ▁Category : R ail ▁mountain ▁passes ▁Category : S ites ▁along ▁the ▁Sil k ▁Road ▁K hy ber ▁Pak ht unk h wa <0x0A> </s> ▁Anal og ▁signal ▁processing ▁is ▁a ▁type ▁of ▁signal ▁processing ▁conducted ▁on ▁continuous ▁analog ▁signals ▁by ▁some ▁analog ▁means ▁( as ▁opposed ▁to ▁the ▁discrete ▁digital ▁signal ▁processing ▁where ▁the ▁signal ▁processing ▁is ▁carried ▁out ▁by ▁a ▁digital ▁process ). ▁" Anal og " ▁indicates ▁something ▁that ▁is ▁mathemat ically ▁represented ▁as ▁a ▁set ▁of ▁continuous ▁values . ▁This ▁diff ers ▁from ▁" dig ital " ▁which ▁uses ▁a ▁series ▁of ▁discrete ▁quantities ▁to ▁represent ▁signal . ▁Anal og ▁values ▁are ▁typically ▁represented ▁as ▁a ▁voltage , ▁electric ▁current , ▁or ▁electric ▁charge ▁around ▁components ▁in ▁the ▁electronic ▁devices . ▁An ▁error ▁or ▁noise ▁affect ing ▁such ▁physical ▁quantities ▁will ▁result ▁in ▁a ▁corresponding ▁error ▁in ▁the ▁signals ▁represented ▁by ▁such ▁physical ▁quantities . ▁ ▁Ex amples ▁of ▁analog ▁signal ▁processing ▁include ▁c ros so ver ▁filters ▁in ▁loud spe akers