Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-08-03
1981-10-27
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 358138, 358261, 364112, H03K 1302
Patent
active
042976804
ABSTRACT:
A waveform digitizer particularly suitable for use in electronic test systems for analyzing and displaying analog signals is disclosed. A digitally derived reference voltage is compared with the analog signal to be digitized during a series of comparison sequences. Simultaneously with the start of each comparison sequence a digital clock is started. Each time the analog signal rises above, or drops below, the reference voltage a decision change detector produces an enable pulse. Each time an enable pulse occurs, a data word, having a portion related to the value of the digitally derived reference voltage and a portion related to the digital clock value, is stored and/or used to control a display. At the end of the first comparison sequence (determined when the digital clock value reaches a predetermined level) the reference voltage is incremented and a second comparison sequence started. These steps are repeated until the reference voltage reaches a predetermined level. The resulting set of digital words is digitized equivalent of the waveform of the analog signal.
REFERENCES:
patent: 3816815 (1974-06-01), Schumann
patent: 4210904 (1980-07-01), Renzel et al.
Shoemaker et al., Digital Testing Oscilloscope-- Troubleshooting, Eletronics, Mar. 16, 1978, pp. 105-112 + 3 sheets of specifications and cover sheet.
The Engineering Stall of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-98 to I-103.
John Fluke Mfg. Co. Inc.
Sloyan Thomas J.
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