Pattern recognition system

Claim 1

An information signal processing system for use with a pattern recognition system which has means (1) for con-verting an information signal of an object to be recognized into an electrical signal (S0), means (7) for receiving the electrical signal from said converting means and producing horizontal and vertical synchronizing signals from the electrical signal and producing a sampling signal (Sp), means (4) for sampling said electrical signal from said converting means controlled by said sampling signal and means (9) for sequentially comparing output signals from said sampling means with reference signals, said information signal processing system being characterized in that said sampling signal producing means comprises means (8) re-ceiving the vertical synchronizing signal and producing a plur-ality of sampling signals (Sp) in one period between adjacent vertical synchronizing signals, and filtering means (3) pro-vided which receives the electrical signal (S0) from said con-verting means and produces an envelope signal (SA) which is ap-proximately equal to said electrical signal (S0) from said con-verting means and supplies its output to said means (4) for samplings, the filtering characteristic of said filtering means (3) being selected so as to smooth said electrical signal (SA) from said converting means during at least more than one hori-zontal scanning period, said signal (SA) from said filtering means being supplied to said sampling means, and said sampling signals (Sp) from said sampling signal producing means (8) being also supplied to said sampling means to determine its sampling time within one period.