Boots – shoes – and leggings
Patent
1994-05-18
1996-01-23
Mai, Tan V.
Boots, shoes, and leggings
364607, G06G 716, G06J 100
Patent
active
054870275
ABSTRACT:
A waveform generator (20) for generating an analog wave which is synchronized with a signal from an input source (22). The waveform generator (20) includes a phase-locked loop (24) for receiving an input source signal and multiplying said signal by a multiplier. The multiplied square wave signal is then provided to a frequency divider (28) and to a first clock input (39) of a first switched-capacitor filter (29). The frequency divider (28) outputs a divided output signal that is received as an input to the phase-locked loop (25) and by the first switched-capacitor filter (35). As a result, the first switched-capacitor filter (29) outputs a first analog wave of a constant amplitude which is phase synchronized with the input source signal. This waveform generator (20) allows the 3 dB point of the filter to move as the input frequency changes. Further embodiments allow the addition of second switched-capacitor filter (50) and a shift register (45) for providing a second analog wave which is phase shifted from said input source signal yet is synchronized therewith.
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Heath Michael C.
Southward Steve C.
Lord Corporation
Mai Tan V.
Thomson Richard K.
Wayland Randall S.
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