Patents by Inventor Pieter Rademeyer

Pieter Rademeyer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for encoding and decoding of audio transmission signals
    Patent number: 5598471
    Abstract: A system for encoding and decoding an audio transmission signal comprises: (a) an encoder with a frequency-varying means to vary the carrier frequency of the audio signal according to an encryption algorithm; (b) a transmitter; (c) a receiver; and (d) a decoder with a multi-plexing filter for separating segments of the audio signal with identical carrier frequencies, and a demodulator corresponding to each carrier signal frequency. The separated segments of the audio signal are switched to the corresponding demodulators according to a decryption algorithm.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: January 28, 1997
    Assignee: South African Microelectronic Systems Ltd.
    Inventor: Pieter Rademeyer