Multiplex communications – Wide area network – Packet switching
Patent
1985-08-30
1988-01-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 85, H04J 110, H04J 302
Patent
active
047180579
ABSTRACT:
An all-digital signal processor (DSP) is disclosed which performs pulse code modulation (PCM) coding and decoding (CODEC) filter operations for both received and transmitted signals, among other functions. A user can access various programmable registers via the microprocessor to specify parameters used in the execution of programs by the DSP. Two 19-bit wide bidirectional data busses are provided for time-division multiplexed communication between various elements, which include a random access memory (RAM), an arithmetic-logic unit (ALU), and an interface to a receive-side analog-to-digital (A/D) converter and a transmit-side digital-to-analog (D/A) converter. A programmed logic array (PLA) executes microcode which controls the processing of signals by the ALU section. A variety of other operations can be performed under control of the PLA such as generation of dual-tone multi-frequency (DTMF) signals commonly used in telecommunications. The architecture of the DSP provides a number of user-accessible registers for the storage of parameters and coefficients used in the generation of the DTMF signals, in the CODEC filtering, and in the compression and expansion of signals. The design of the general-purpose DSP is readily expandible to accomodate additional circuit elements and/or more signals to be processed in parallel.
REFERENCES:
patent: 4530093 (1985-07-01), Akram et al.
patent: 4551721 (1985-11-01), Kozlik
patent: 4564938 (1986-01-01), Boot
patent: 4608685 (1986-08-01), Jain et al.
Laugesen Ronald C.
Singh Gururaj
Venkitakrishnan P.
Advanced Micro Devices , Inc.
King Patrick T.
Olms Douglas W.
Salomon Kenneth B.
Scutch III Frank M.
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