Variable delay device

Details Variable delay device Variable delay device

1978-01-24

1979-08-21

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic bulk wave propagation means

333147, 333148, H03H 930, H03H 900, H01L 4112, H01L 4120

Patent

active

041654986

ABSTRACT:
A variable delay device for delaying an electrical signal includes a bar-shaped magnetostrictive member to be a transmitting path of a supersonic wave, an input transducer for converting an electric signal into a supersonic wave and an output transducer for converting a supersonic wave into an electric signal, the input and output transducers being provided at at opposite end portions of the magnetostrictive member, and a magnetic field producing device provided between the input and output transducers for supplying the magnetostrictive member with a magnetic field which varies in intensity along the elongated direction of the magnetostrictive member. The magnetic field supplied to the magnetostrictive member is controlled by a control signal applied to the magnetic field producing device to vary the Young's modulus of the magnetostrictive member. As a result, the velocity of the supersonic wave being transmitted therein is varied, to thereby control the delay time of the electric signal.

REFERENCES:
patent: 2913680 (1959-11-01), Porter et al.
patent: 3034077 (1962-05-01), Kretzmer et al.

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