초록 ▼

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 overh

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.

대표청구항 ▼

A digital radio comprising: at least one audio destination requiring an output analog signal; RF transceiving circuitry for transmitting RF signals over the air and for receiving RF signals transmitted over the air; a control microprocessor connected to control said RF transceiving circuitry; and a

A digital radio comprising: at least one audio destination requiring an output analog signal; RF transceiving circuitry for transmitting RF signals over the air and for receiving RF signals transmitted over the air; a control microprocessor connected to control said RF transceiving circuitry; and a memory limited mixed signal speech processing chip coupled to said control microprocessor and to said input and output analog signals, said speech processing chip including an analog signal processor and a digital signal processor, said speech processing chip for: (a) converting said input analog signal to a digital signal, (b) compressing said digital signal, (c) encrypting said digital signal; and (d) synchronizing said steps (a)-(c) to process a stream of speech information in real time.