Multiplex communications – Wide area network – Packet switching
Patent
1996-06-20
1998-12-08
Pan, Daniel H.
Multiplex communications
Wide area network
Packet switching
370468, 370517, 39520063, G06F 108, G06F 1314
Patent
active
058482660
ABSTRACT:
A method and apparatus for adaptively transferring a time varying signal over a bus. According to the method, data representing the time varying signal by a specified digital representation is requested. A first number of data elements are transferred during a first time period, and an allocated bandwidth value representing a data transfer rate achieved in the transfer is then determined. The requested digital representation is subsequently adjusted according to the allocated bandwidth value. An apparatus of the present invention includes a processor and a host controller coupled to a processor bus. A source of digital values representing a time varying signal is coupled to the host controller. A memory coupled to the processor bus contains a data request routine for requesting digital values representing the time varying signal at a selected quality level. The memory also contains a data receipt routine, a plurality of data items received by the data receipt routine, a data item count, and an adjustment routine for comparing the value to an expected value determined by the selected quality level and for adjusting the selected quality level.
REFERENCES:
patent: 4564915 (1986-01-01), Evans et al.
patent: 4759014 (1988-07-01), Decker et al.
patent: 5034811 (1991-07-01), Palm
patent: 5214507 (1993-05-01), Aravind et al.
"Universal Serial Bus Specification":Revision 1.0, Jan. 15, 1996, pp. 1-267, Intel Corporation.
Draeger Jeffrey S.
Intel Corporation
Pan Daniel H.
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