Detector and detection method

A detector configured to obtain an output signal from an input signal containing a target signal and output the output signal, the detector comprising:

• an amplifier configured to receive the input signal and the output signal, compare the input signal to the output signal to output a comparison result;
• an envelope generator configured to weight a first value and a second value having a sign opposite to that of the first value in accordance with the comparison result, integrate the weighted first value and the weighted second value, and output an integration result as the output signal;
• and
• a controller configured to control the envelope generator in accordance with the input signal, wherein
• the controller controls the envelope generator to mitigate an increase in an absolute value of the integration result when a length of a period, in which the comparison result indicates that an absolute value of the input signal is greater than an absolute value of the output signal, is greater than a predetermined value.

A detection method obtaining an output signal from an input signal containing a target signal, the method comprising:

• comparing the input signal to the output signal;
• weighting a first value and a second value having a sign opposite to that of the first value in accordance with an obtained comparison result, integrating the weighted first value and the weighted second value, and outputting an integration result as the output signal;
• and
• mitigating an increase in an absolute value of the integration result when the input signal contains a frequency component other than a frequency component of the target signal.

A detection method obtaining an output signal from an input signal containing a target signal, the method comprising:

• comparing the input signal to the output signal;
• weighting a first value and a second value having a sign opposite to that of the first value in accordance with an obtained comparison result, integrating the weighted first value and the weighted second value, and outputting an integration result as the output signal;
• and
• mitigating an increase in an absolute value of the integration result when a length of a period, in which the comparison result indicates that an absolute value of the input signal is greater than an absolute value of the output signal, is greater than a predetermined value.