Patents by Inventor Hubert Martin

Hubert Martin 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).

  • Instantaneous compressor and instantaneous expandor
    Patent number: 4309676
    Abstract: An instantaneous compressor and an instantaneous expandor both of which use the logarithmic characteristics of diodes to provide compression and expansion, respectively, of uncompressed analog PAM signals and compressed analog PAM signals. Both the compressor and expandor also include circuitry having a temperature dependent gain characteristic. The signal at the compressor output is a temperature independent compressed analog signal which follows the compressor's logarithmic encoding characteristic. The signal at the output of the expandor is a temperature independent uncompressed analog signal which is substantially identical to the analog signal at the compressor input.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: January 5, 1982
    Assignee: Reliance Electric Company
    Inventors: Hubert Martin, Gerald W. Beene