Digital radio with vocoding encrypting codec

Patent 5592556 Issued on January 7, 1997. Estimated Expiration Date:

August 9, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventor

Schwed, Daniel I.

Assignee

Ericsson GE Mobile Communications Inc.

Application

No. 287812 filed on 08/09/1994

US Classes:

380/274, Synchronization455/553.1, Radiotelephone having plural transceivers (e.g., for analog and digital, trunking and cellular, etc.)455/563Having voice recognition or synthesization

Examiners

Primary: Cangialosi, Salvatore

Attorney, Agent or Firm

Nixon & Vanderhye P.C.

Foreign Patent References

0425964A2 EP. 05/12/1991
0578361A1 EP. 01/12/1994
2133255 GB. 07/12/1984
WO9215159 WO. 09/12/1992

International Class

H04L 009/00

Abstract

A new digital radio includes codec, vocoder and encryption/decryption processing all on a single integrated circuit chip module. Great flexibility is provided in terms of different operating modes (e.g., encrypt/decrypt only, vocode only, or encrypt/decrypt and vocode). Radio control processor overhead is reduced substantially, because the radio control processor does not need to transfer data between codec, vocoder and encryption/decryption processes and/or components. An internal executive routine within the module handles all vocoder and encryption command and data processing. A special synchronization scheme is provided to synchronize the transceiver modem rate with the speech processing rate. The single-chip speech processing module is sufficiently flexible to allow users to define, write, load and use their own encryption/decryption routines without requiring a new masked ROM.

Other References

Bell System Technical Journal, vol. 60, No. 7, Sep. 1981, Murray Hill (US), pp. 1563-1572, McGonegal et al., "Private Communications,", p. 1563, line 1 to p. 1564, line 15
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O'Connor et al., "Implementation of Secure Voice (STU-III) Into the Land Mobile Satellite System," Conference Record, vol. 1 of 3, pp. 5.5.1-5.5.4, Communications-Fusing Command Control and Intelligence, San Diego, California (Oct. 1992