Process for recording low-frequency wide-band signals on a thermoplastic storage medium

US4015248A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dietlind Pekau · Taufkirchen, DE
• Eckhard Storck · Munich, DE

Key dates

• Filing date: Mar 17, 1976
• Grant date: Mar 29, 1977
• Expiry date: Mar 17, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G11C13/046
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A process for recording low-frequency, wide-band signals on a thermoplastic storage medium to obtain an improved signal-to-noise ratio characterized by exposing the thermoplastic storage medium with the information to be recorded and either simultaneously or in a sequential relation imposing a lattice signal onto the storage medium. In one embodiment of the process, the lattice signal is obtained by utilizing an optical grating which modulates light passing therethrough with the lattice signal. If the lattice signal is to be imposed simultaneously with the exposing of the information, the light containing the information is passed through the optical grating to have the lattice signal imposed thereon. In another embodiment, the lattice signal is imposed on the storage medium electronically by utilizing spaced electrode pairs which are energized either simultaneously with the exposing of the thermoplastic or in a sequential relation therewith.