David G. Decker - Sunnyvale CA Andrew C. Brost - San Jose CA Roy I. Vandermolen - Pleasanton CA
Assignee:
Ampex Corporation - Redwood City CA
International Classification:
H04J 322 H04J 312
US Classification:
370 84
Abstract:
Digital data is received on a plurality of input channels at unrelated, asynchronous input clock rates. The data is multiplexed and transmitted via one or more synchronous parallel channels, together with encoded information related to the original asynchronous input clock rate on each channel. The data received from the synchronous channels is demultiplexed and redistributed to proper output channels and clocked out therefrom at rates derived from the encoded and reconstituted asynchronous clock rate information from each channel.
High Speed Digital Data Correlator Having A Synchronous Pipelined Full Adder Cell Array
High speed digital data correlator utilizing as a summing circuit single bit full adder cells in a synchronous pipelined array arrangement to sum the number of bit matches with a selected correlation word in a serial data stream. Each adder cell has up to three inputs and provides a partial sum by adding up to three bits of equal powers of two. The simple full adder cell architecture minimizes interconnect lengths between the adjacent synchronous stages of the summing circuit and maintains near constant circuit density across the stages. These features contribute to an optimization of the operational speed of the correlator for any given circuit technology. The correlator of the preferred embodiment detects two complementary, mutually exclusive correlation words, using the same correlation circuit.
Operating A Power Supply Circuit Of A Communications Device
A method for operating a power supply circuit of a communications device involves operating the power supply circuit in a first operating mode in which a switching frequency of the power supply circuit is higher than an operating frequency band of the communications device and switching the power supply circuit to operate in a second operating mode in response to connecting the power supply circuit to a battery by decreasing the switching frequency of the power supply circuit.