Signal processing apparatus

Claim 2

An electric-impulse signal-processing apparatus having, in combination, an elastic-wave-supporting device, input and output transducer means disposed at the device for respectively coupling electric impulses thereto to generate and propagate elastic waves therein and for transducing such waves into electric output impulses, and means for applying a transient time-varying energy field to the device during the coupling of said electric impulses into the device by the input transducer means, and which varies substantially during the transit of an impulse in said device, in order to cause different frequencies in said waves to be advanced or delayed in time by different amounts, thereby to introduce time signal-processing into the output impulses.

Claim 3

An electric-impulse signal-processing apparatus as claimed in claim 1 and in which said field is magnetic and means is provided for converting said elastic waves to spin waves upon which the time-varying energy field acts in the manner of a magnon elevator.

Claim 4

An electric-impulse signal-processing apparatus as claimed in claim 2 and in which means is provided for converting said spin waves to elastic waves for transducing into said electric output impulses.

Claim 5

An electric-impulse signal-processing apparatus as claimed in claim 2 and in which the time-varying field is applied and removed to cause the magnon elevator action to reverse.

Claim 6

An electric-impulse signal-processing apparatus having, in combination, an elastic-wave-supporting device capable of supporting relatively slow and fast elastic waves, input and output transducer means disposed at the device for respectively coupling electric impulses thereto in order to generate and propagate therein one of the said elastic waves and for transducing the other of said elastic waves into electric output impulses, and means for applying a transient time-varying energy field to the device during the coupling of said electric impulses into the device by the input transducer means, and which varies substantially during the transit of an impulse in said device, in order to cause the said one elastic waves propagating in said device to become converted into the said other elastic waves, thereby to introduce time signal-processing into the output impulses caused both by the conversion from the said one to the said other elastic waves and by the difference in velocity therebetween.

Claim 7

An electric-impulse signal-processing apparatus having, in combination, an elastic-wave-supporting device capable of supporting relatively slow and fast elastic waves, input and output transducer means disposed at the device for respectively coupling electric impulses thereto in order to generate and propagate therein one of the said elastic waves and for transducing the other of said elastic waves into electric output impulses, and means for applying a transient time-varying energy field to the device during the coupling of said electric impulses into the device by the input transducer means, and which varies substantially during the transit of an impulse in said device, in order to cause the said one elastic waves propagating in said device to become converted into the said other elastic waves, thereby to introduce time signal-processing into the output impulses caused both by the conversion from the said one to the said other elastic waves and by the difference in velocity therebetween.

Claim 8

An apparatus as claimed in claim 5 and in which said device comprises magnetic crystal means and said time-varying energy field is produced by time-varying magnetic field-producing means.

Claim 9

An apparatus as claimed in claim 6 and in which said crystal means comprises a YIG crystal and said transducer means comprise shear and longitudinal elastic-wave transducers.

Claim 10

An apparatus as claimed in claim 7 and in which the said YIG crystal is a single rod disposed within an outer polycrystal YIG structure about which the magnetic field-producing means is disposed.

Claim 11

An apparatus as claimed in claim 8 and in which the outer YIG structure is substantially spherical and the said YIG crystal is disposed substantially diametrically therein.

Claim 12

An apparatus as claimed in claim 5 and in which the said electric impulses comprise a frequency-modulated pulse, the said one and other elastic waves are respectively the said slow and fast waves, and the said signal processing results in compression of the input electric impulses.

Claim 13

An apparatus as claimed in claim 6 and in which the said magnetic field is oriented relative to said crystal means in one of a substantially 22.5* angle to the ''''100'''' axis in the ''''100'''' plane and a substantially 25.52* angle to the ''''100'''' axis in the ''''110'''' plane.

Claim 14

Apparatus as claimed in claim 2 and in which means is provided for spatially varying field along the device.

Claim 15

An electric-impulse signal-processing apparatus comprising a magnetic crystal including YIG, and a magnetic-field-producing means oriented to set up its field at one of a substantially 22.5* and a 25.52* angle with respect to the ''''100'''' axis in the respective ''''100'''' and ''''110'''' planes.

Claim 16

An electric-impulse signal-processing apparatus comprising a magnetic crystal including YIG, and a magnetic-field-producing means oriented to set up its field at one of a substantially 22.5* and a 25.52* angle with respect to the ''''100'''' axis in the respective ''''100'''' and ''''110'''' planes.

Claim 17

Apparatus as claimed in claim 13 and in which means is provided for propagating elastic waves in said crystal substantially along said ''''100'''' axis.

Claim 20

A method as claimed in claim 15 and in which said field is magnetic and said propagating comprises introducing one type of elastic wave into said medium and converting the same to a spin wave therein upon which the time-varying energy field acts in the manner of a magnon elevator.

Claim 21

A method as claimed in claim 16 and in which the spin wave conversion is followed by conversion into a second type of elastic wave.

Claim 22

A method as claimed in claim 17 and in which the said types are relatively slow and fast elastic waves.

Claim 23

A method as claimed in claim 16 and in which there is further effected spatial varying of field along the medium.