Apparatus for the digital storage of audio signals employing read only memories

US4905289A · kind A · utility

Assignee

• Deutsche ITT Industries, GmbH · DE

Inventors

• Ljubomir Micic · Glückstadt, DE
• Thomas Fischer · Umkirch, DE

Key dates

• Filing date: Feb 27, 1989
• Grant date: Feb 27, 1990
• Expiry date: Feb 27, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G11C2207/16
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A semiconductor read only memory (ROM) serves to store digitized audio signals in a redundancy free form. The output of the memory is coupled to the input of a data expander in the playback circuit. The memory may also store an algorithm which serves to control operation of the data expander before the signals are further processed via a digital-to-analog converter and where the output of the digital/analog converter is then coupled to the input of an analog amplifier and then to a loud speaker arrangement. In this manner, digitized audio signals can be operated on by either error correcting modules or data expansion modules, both of which modules may include microprocessors where the algorithms for control of the microprocessors are also stored within the read only memory. In this manner, all mechanical movements between the storage medium and the pick up devices, which are typical of the prior art, is eliminated as the main storage medium consists of a read only memory or a plurality of such devices.