Correlating filter and CDMA receiver

A correlating filter comprising:

• delaying means for applying a delay process to an input signal and outputting a plurality of delayed signals having different delays;
• weighted adder means for weighting said plurality of delayed signals from said delaying means, respectively, and adding the weighted delayed signals;
• and
• operation control means for enabling a power feed to said weighted adder means while said weighted adder means outputs an output signal having a correlation peak.

A correlating filter comprising:

• delaying means for applying a delay process to an input signal and outputting a plurality of delayed signals having different delays;
• weight adder means for weighting said plurality of delayed signals from said delaying means, respectively, and adding the weighted delayed signals;
• and
• switching means for inputting said delayed signals from said delaying means into said weighted adder means while said weighted adder means while said weighted adder means outputs and output signal having a correlation peak, meanwhile, otherwise, outputting a fixed value which provides no correlation in a correlated output signal to said weighted adder means instead of said delayed signals from said delaying means.

A correlating filter comprising:

• delaying means for applying a delay process to an input signal and outputting a plurality of delayed signals having different delays;
• weight adder means for weighting said plurality of delayed signals from said delaying means, respectively, and adding the weighted delayed signals;
• and
• switching means for inputting weighting coefficients from external into said weighted adder means while said weighted adder means outputs an output signal having a correlation peak, meanwhile, otherwise, outputting a fixed value which provides no correlation in a correlated output signal to said weighted adder means instead of said weighted coefficients.