Credence Systems Corporation

Other

Douglas J Chapman

Jeffrey D Currin

Philip Theodore Kuglin

A push-up exercise enhancement device for verifying and counting push-ups includes a base. Each of a pair of rods is coupled to and extends perpendicularly from proximate to a respective opposing end of the base. Each rod comprises a plurality of nested sections so that the rods are selectively extensible. A plate is coupled to and extends between the rods distal from the base. The plate and the base define an upper limit and a lower limit for a proper push-up. A counter is operationally coupled to the base and the plate. The counter is configured to assess sequential contacts to the base and the plate by the torso of the user to determine the proper push-up and to display a count of the proper push-ups to the user.

Push-up exercise enhancement device

A timing signal generator adjustably times successive pulses of an output timing signal. The generator receives input data before each output pulse and controls the timing of that output pulse in accordance with the input data. The generator includes a circuit providing a set of 2N phase signals frequency locked to a reference clock signal but evenly distributed in phase. First and second selectors each sample the data once during each cycle of the clock signal. The sampled data tells the first selector whether it is to produce a first output signal during the next clock signal cycle and, if so, which of the first N phase signals the first selector is to select for controlling timing of edges of the first output signal. The sampled data also tells the second selector whether it is to produce a second output signal during a next clock signal cycle and, if so, which of the second N phase signals the second selector is to select for controlling the second output signal. The first and second output signals are logically ORed to produce the timing signal. The timing of data sampling by each selector is separately adjusted so that the selector output signal changes state only when the selected phase signal changes state and not when the selector changes its selection in response to newly sampled input data.

Apparatus for controlling timing of signal pulses

A timing vernier produces a set of timing signals of similar frequency and evenly distributed in phase by passing an input reference clock signal through a succession of delay stages, each stage providing a similar signal delay. A separate one of the timing signals is produced at the output of each delay stage. The reference clock signal and timing signal output of the last delay stage are supplied as inputs to a phase lock controller through separate adjustable first and second delay circuits. The phase lock controller controls the delay of all stages so that the timing signal output of the last stage is phase locked to the reference clock. In accordance with the invention, the delays of the first and second delay circuits are adjusted to compensate for controller phase lock error.

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Lake Oswego, OR, United States of America

Douglas J Chapman