Host signal processing communication system that compensates for

Details Host signal processing communication system that compensates for Host signal processing communication system that compensates for

1995-09-12

1998-02-24

Lall, Parshotam S.

395872, G06F 1300

Patent

active

057218307

ABSTRACT:
An HSP communications system contains a host computer which executes a software modem program and a device containing a circular buffer and a D/A converter. Typically, the host executes update routines in response to interrupts from the device and writes to the circular buffer digital samples representing amplitudes of an analog signal complying with a desired communication protocol. The samples pass through the circular buffer to the D/A converter which converts the samples into an analog communication signal. In environments such as multi-tasking systems, the host may occasionally skip interrupts and not provide new samples when required. In this case, the D/A converter reuses samples in the circular buffer to generate a maintenance signal. The maintenance signal typically does not convey correct data but is sufficient to maintain a communication link and prevent a remote device from disconnecting or entering a retrain mode. To provide a smoother maintenance signal, the circular buffer's size contains samples for an integral number of periods at the carrier and baud frequency of the desired protocol. Error correction and retransmission replace incorrect or lost data.

REFERENCES:
patent: 4972411 (1990-11-01), Fushimi et al.
patent: 4991169 (1991-02-01), Davis et al.
patent: 4995074 (1991-02-01), Goldman et al.
patent: 5375228 (1994-12-01), Leary et al.

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