Boots – shoes – and leggings
Patent
1992-12-11
1995-07-04
Voeltz, Emanuel T.
Boots, shoes, and leggings
364158, 375364, 370 82, 370 84, 327145, H04J 1300, H04L 2900
Patent
active
054306590
ABSTRACT:
An apparatus for generating a control signal including pulses occurring at a first frequency f1 and having an overall mean frequency f2 which is in an exact ratio to the difference between the frequencies of a reference signal N and an offset signal O has a common oscillator 18 operating at the frequency of the reference signal N. The offset signal O is produced from the oscillator 18 by a first channel 24a of a 2-channel direct digital synthesizer (DDS), and the frequency f1 is generated by its second channel 24b. The offset signal O controls the rate at which data is entered into a first-in first-out store (FIFO) 54. The signal from the second channel 24b of the DDS triggers sub-sequences of pulses to produce the required control signal, which modifies the extraction of data from the FIFO 54 occurring at the rate of the reference signal N. Each sub-sequence may include one pulse, no pulse or two pulses. The modifications introduced by the control signal exactly balance the accumulation of a surplus or deficiency of data which arises from the frequency offset between the signals N and O.
The apparatus may be used to synthesize signals for testing communications equipment such as for SONET and SDH networks.
REFERENCES:
patent: 5148434 (1992-09-01), Richardson
patent: 5267236 (1993-11-01), Stephenson, Jr.
patent: 5337334 (1994-08-01), Molloy
Telcom Report International vol. 14, No. 5, Sep. 1991, pp. 46-48, "New Measuring Technology for SDH".
Hewlett -Packard Company
Pipala Edward J.
Voeltz Emanuel T.
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