Abstract: An improved shell sorter is disclosed. One improvement resides in the incorporation of a bandpass filter with a center frequency selected on the basis of the signals produced by a transducer in response to the impact of shell fragments or other components of the material to be rejected against a target plate, instead of a high pass filter which passes signals above a given frequency which possibly represent not only components of the material to be rejected, but other components of the material which may not be desired to be rejected. The use of a bandpass filter provides higher selectivity and precision of operation with respect to the rejection of shell fragments. Another improvement resides in the use of a differential or window comparator circuit for discriminating shell fragments from nut meats which for some reason, such as dryness, cause the transducer to produce a signal having a frequency characteristic which is typically representative of shell fragments.