Concatenated surface wave delay line correlator

A surface wave device comprising a dielectric substrate member having a surface thereon over which signals to be modulated are propagated, means forming a row of spaced conductors on said surface, said conductors being oriented normal to the direction of signal propagation and arranged in said row in substantially equispaced groups, a second group of spaced conductors on said surface adjacent to one end of the row of spaced conductors, conductive means on said surface connected to selected ones of the conductors in said row and in said second group, a source of encoded electric responses and means connecting said source to selected ones of the conductive means, the electric responses having a modulating effect on signals propagated along said row of conductors, the modulation produced by the encoded electric responses applied to the conductive means associated with said second group combining with the electric responses applied to the conductive means associated with said row of conductors to produce a resultant modulating effect on the propagated signal that is a product of the encoding of the electric responses applied to the conductors of said row and of said second group.

A surface wave device comprising a piezoelectric substrate having a surface thereon, means for propagating an encoded signal to be modulated over said substrate surface, means forming a plurality of spaced conductive strips positioned in a row extending along said surface in the direction in which the signal to be modulated is propagated, said strips being oriented perpendicular to the direction of propagation and arranged in spaced groups along said row, means for modulating the encoded signal propagated along said row of strips including a first source of electric modulating signals of predetermined frequency, means connecting said first signal source to selected strips in said groups of strips and a second source of electric modulating signals having distinctive frequency characteristics, means connecting said second source to selected strips in one of the groups of strips, said first and said second signal sources modulating the propagated signal according to a product of the modulating frequencies of the first and second signal sources.

A concatenated surface wave delay line comprising a piezoelectric substrate member having a surface over which a signal to be modulated is propagated, means formed on said surface extending in the direction of signal propagation including a plurality of spaced elongated conductive members arranged in spaced groups in a row on the surface with the individual conductive members in said row being oriented normal to the direction of signal propagation, an input group of spaced conductive members positioned on said surface in alignment with said row but spaced from one end thereof, the conductive members of said row of spaced groups including the connections thereto being arranged to distinctively modulate signals propagated along said row, the conductive members in the input group including the connections thereto being arranged to distinctively modulate signals propagated by said input group, said modulating means including first and second input signal sources each having distinct modulating frequency characteristics, means connecting the first signal source to selected conductive members in the groups which form the row, and means connecting the second signal source to selected conductive members in the input group, the propagated signal being modulated according to a product of the modulating characteristics of the first and second signal sources.