Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-05-19
1986-03-04
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340721, 324121R, G09G 100
Patent
active
045742782
ABSTRACT:
A video synthesizer is adapted for connection to the input circuitry of an oscilloscope, and includes sampling and multiplexing circuitry for presentation of a multiplicity of input signals to a single channel of the oscilloscope. The signals are sampled sequentially, and the samples of respective ones of the signals are multiplexed with corresponding reference voltage levels of a voltage divider so as to vertically displace the signals on the face of the oscilloscope. For periodic input signals, the sequential sampling is repeated at a rate which is not harmonically related to the periodicity of the input signals to fully regenerate the signal waveforms on the oscilloscope. A memory is provided for storing intervals of the input signals in the case of nonperiodic signals, the stored signals then being outputted to the sampling and multiplexing circuitry. By presetting an address counter of the memory, and by selecting a data sampling rate of the memory, the displayed waveforms can be displaced along the x axis of the oscilloscope and expanded to facilitate visual inspection. To provide a maximum rate of sampling, the multiplexing is accomplished with an interlacing of the reference voltages to minimize voltage jumps and reduce the bandwidth of the sample sequence.
REFERENCES:
patent: 2910681 (1959-10-01), Mita
patent: 4471348 (1984-09-01), London et al.
Oscilloscope Switch-Pogson; Electronics, Australia, vol. 43, No. 2, 2/81; pp. 40-47.
Bobis Daniel H.
Curtis Marshall M.
Ragen Data Systems, Inc.
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